GE Corometrics 250cx Series Service Manual

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GE Healthcare

Corometrics™ 250cx Series Monitor

Service Manual

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GE Healthcare

Corometrics™ 250cx Series Monitor

Service Manual

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shown herein, or discontinue the product described at any time without notice or obligation. Contact your

GE Representative for the most current information. SuperSTAT™ is the property of GE MEDICAL SYSTEMS Information Technologies, a GE Healthcare Company which is a division of General Electric Corporation. GE and GE Monogram are trademarks of General Electric Company. All other company and product names mentioned may be trademarks of the companies with which they are associated.

Warranty

This product is sold by GE Healthcare with a GE repair warranty period of 12-month to cover labor and parts* (except for the expendable parts like fuses or batteries which have a 30-day warranty) under the terms and conditions set forth in the GE Healthcare Warranty Statement presented to the customer at the point of sale.

* The warranty time may vary in some regions. Refer to the warranty information provided at the point of sale.

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ПРЕДУПРЕЖДЕНИЕ

Това упътване за работа е налично само на английски език.

(BG)

(ZH-CN)

(ZH-HK)

• Ако доставчикът на услугата на клиента изиска друг език, задължение на клиента е да осигури превод.

• Не използвайте оборудването, преди да сте се консултирали и разбрали упътването за работа.

• Неспазването на това предупреждение може да доведе до нараняване на доставчика на услугата, оператора или пациентa в резултат на токов удар, механична или друга опасност.

警告

本维修手册仅提供英文版本。

• 如果客户的维修服务人员需要非英文版本，则客户需自行提供翻译服务。

• 未详细阅读和完全理解本维修手册之前，不得进行维修。

• 忽略本警告可能对维修服务人员、操作人员或患者造成电击、机械伤害或其他形式的伤害。

警告

本服務手冊僅提供英文版本。

• 倘若客戶的服務供應商需要英文以外之服務手冊，客戶有責任提供翻譯服務。

• 除非已參閱本服務手冊及明白其內容，否則切勿嘗試維修設備。

• 不遵從本警告或會令服務供應商、網絡供應商或病人受到觸電、機械性或其他的危險。

(ZH-TW)

(HR)

警告

本維修手冊僅有英文版。

• 若客戶的維修廠商需要英文版以外的語言，應由客戶自行提供翻譯服務。

• 請勿試圖維修本設備，除非您已查閱並瞭解本維修手冊。

• 若未留意本警告，可能導致維修廠商、操作員或病患因觸電、機械或其他危險而受傷。

UPOZORENJE

Ovaj servisni priručnik dostupan je na engleskom jeziku.

• Ako davatelj usluge klijenta treba neki drugi jezik, klijent je dužan osigurati prijevod.

• Ne pokušavajte servisirati opremu ako niste u potpunosti pročitali i razumjeli ovaj servisni priručnik.

• Zanemarite li ovo upozorenje, može doći do ozljede davatelja usluge, operatera ili pacijenta uslijed strujnog udara, mehaničkih ili drugih rizika.

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VÝSTRAHA

Tento provozní návod existuje pouze v anglickém jazyce.

(CS)

(DA)

(NL)

• V případě, že externí služba zákazníkům potřebuje návod v jiném jazyce, je zajištění

překladu do odpovídajícího jazyka úkolem zákazníka.

• Nesnažte se o údržbu tohoto zařízení, aniž byste si přečetli tento provozní návod a

pochopili jeho obsah.

• V případě nedodržování této výstrahy může dojít k poranění pracovníka prodejního

servisu, obslužného personálu nebo pacientů vlivem elektrického proudu, respektive vlivem mechanických či jiných rizik.

ADVARSEL

Denne servicemanual ndes kun på engelsk.

• Hvis en kundes tekniker har brug for et andet sprog end engelsk, er det kundens ansvar

at sørge for oversættelse.

• Forsøg ikke at servicere udstyret uden at læse og forstå denne servicemanual.

• Manglende overholdelse af denne advarsel kan medføre skade på grund af elektrisk

stød, mekanisk eller anden fare for teknikeren, operatøren eller patienten.

WAARSCHUWING

Deze onderhoudshandleiding is enkel in het Engels verkrijgbaar.

• Als het onderhoudspersoneel een andere taal vereist, dan is de klant verantwoordelijk

voor de vertaling ervan.

• Probeer de apparatuur niet te onderhouden alvorens deze onderhoudshandleiding werd

geraadpleegd en begrepen is.

• Indien deze waarschuwing niet wordt opgevolgd, zou het onderhoudspersoneel, de

operator of een patiënt gewond kunnen raken als gevolg van een elektrische schok, mechanische of andere gevaren.

(EN)

(ET)

WARNING:

This service manual is available in English only.

• If a customer’s service provider requires a language other than English, it is the

customer’s responsibility to provide translation services.

• Do not attempt to service the equipment unless this service manual has been consulted

and is understood.

• Failure to heed this warning may result in injury to the service provider, operator, or

patient from electric shock, mechanical hazards, or other hazards.

HOIATUS

See teenindusjuhend on saadaval ainult inglise keeles

• Kui klienditeeninduse osutaja nõuab juhendit inglise keelest erinevas keeles, vastutab

klient tõlketeenuse osutamise eest.

• Ärge üritage seadmeid teenindada enne eelnevalt käesoleva teenindusjuhendiga

tutvumist ja sellest aru saamist.

• Käesoleva hoiatuse eiramine võib põhjustada teenuseosutaja, operaatori või patsiendi

vigastamist elektrilöögi, mehaanilise või muu ohu tagajärjel.

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VAROITUS

Tämä huolto-ohje on saatavilla vain englanniksi.

(FI)

(FR)

(DE)

• Jos asiakkaan huoltohenkilöstö vaatii muuta kuin englanninkielistä materiaalia,

tarvittavan käännöksen hankkiminen on asiakkaan vastuulla.

• Älä yritä korjata laitteistoa ennen kuin olet varmasti lukenut ja ymmärtänyt tämän huolto-ohjeen.

• Mikäli tätä varoitusta ei noudateta, seurauksena voi olla huoltohenkilöstön, laitteiston käyttäjän tai potilaan vahingoittuminen sähköiskun, mekaanisen vian tai muun vaaratilanteen vuoksi.

ATTENTION

Ce manuel d’installation et de maintenance est disponible uniquement en anglais.

• Si le technicien d’un client a besoin de ce manuel dans une langue autre que l’anglais, il incombe au client de le faire traduire.

• Ne pas tenter d’intervenir sur les équipements tant que ce manuel d’installation et de maintenance n’a pas été consulté et compris.

• Le non-respect de cet avertissement peut entraîner chez le technicien, l’opérateur ou le patient des blessures dues à des dangers électriques, mécaniques ou autres.

WARNUNG

Diese Serviceanleitung existiert nur in englischer Sprache.

• Falls ein fremder Kundendienst eine andere Sprache benötigt, ist es Aufgabe des Kunden für eine entsprechende Übersetzung zu sorgen.

• Versuchen Sie nicht diese Anlage zu warten, ohne diese Serviceanleitung gelesen und verstanden zu haben.

• Wird diese Warnung nicht beachtet, so kann es zu Verletzungen des

Kundendiensttechnikers, des Bedieners oder des Patienten durch Stromschläge,

mechanische oder sonstige Gefahren kommen.

(EL)

ΠΡΟΕΙΔΟΠΟΙΗΣΗ

Το παρόν εγχειρίδιο σέρβις διατίθεται μόνο στα αγγλικά.

• Εάν ο τεχνικός σέρβις ενός πελάτη απαιτεί το παρόν εγχειρίδιο σε γλώσσα εκτός των αγγλικών, αποτελεί ευθύνη του πελάτη να παρέχει τις υπηρεσίες μετάφρασης.

• Μην επιχειρήσετε την εκτέλεση εργασιών σέρβις στον εξοπλισμό αν δεν έχετε συμβουλευτεί και κατανοήσει το παρόν εγχειρίδιο σέρβις.

• Αν δεν προσέξετε την προειδοποίηση αυτή, ενδέχεται να προκληθεί τραυματισμός στον τεχνικό σέρβις, στο χειριστή ή στον ασθενή από ηλεκτροπληξία, μηχανικούς ή άλλους κινδύνους.

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FIGYELMEZTETÉS

Ezen karbantartási kézikönyv kizárólag angol nyelven érhető el.

(HU)

(IS)

(IT)

• Ha a vevő szolgáltatója angoltól eltérő nyelvre tart igényt, akkor a vevő felelőssége a

fordítás elkészíttetése.

• Ne próbálja elkezdeni használni a berendezést, amíg a karbantartási kézikönyvben

leírtakat nem értelmezték.

• Ezen gyelmeztetés gyelmen kívül hagyása a szolgáltató, működtető vagy a beteg

áramütés, mechanikai vagy egyéb veszélyhelyzet miatti sérülését eredményezheti.

AÐVÖRUN

Þessi þjónustuhandbók er aðeins fáanleg á ensku.

• Ef að þjónustuveitandi viðskiptamanns þarfnast annas tungumáls en ensku, er það

skylda viðskiptamanns að skaa tungumálaþjónustu.

• Reynið ekki að afgreiða tækið nema að þessi þjónustuhandbók hefur verið skoðuð og

skilin.

• Brot á sinna þessari aðvörun getur leitt til meiðsla á þjónustuveitanda, stjórnanda eða

sjúklings frá raosti, vélrænu eða öðrum áhættum.

AVVERTENZA

Il presente manuale di manutenzione è disponibile soltanto in lingua inglese.

• Se un addetto alla manutenzione richiede il manuale in una lingua diversa, il cliente è

tenuto a provvedere direttamente alla traduzione.

• Procedere alla manutenzione dell’apparecchiatura solo dopo aver consultato il presente

manuale ed averne compreso il contenuto.

• Il mancato rispetto della presente avvertenza potrebbe causare lesioni all’addetto alla

manutenzione, all’operatore o ai pazienti provocate da scosse elettriche, urti meccanici

o altri rischi.

(JA)

(KO)

このサービスマニュアルには英語版しかありません。

• サービスを担当される業者が英語以外の言語を要求される場合、翻訳作業はその業

者の責任で行うものとさせていただきます。

• このサービスマニュアルを熟読し理解せずに、装置のサービスを行わないでくださ

い。

• この警告に従わない場合、サービスを担当される方、操作員あるいは患者さんが、

感電や機械的又はその他の危険により負傷する可能性があります。

경고

본 서비스 매뉴얼은 영어로만 이용하실 수 있습니다.

• 고객의 서비스 제공자가 영어 이외의 언어를 요구할 경우, 번역 서비스를 제공하는

것은 고객의 책임입니다.

• 본 서비스 매뉴얼을 참조하여 숙지하지 않은 이상 해당 장비를 수리하려고 시도하지

마십시오.

• 본 경고 사항에 유의하지 않으면 전기 쇼크, 기계적 위험, 또는 기타 위험으로 인해

서비스 제공자, 사용자 또는 환자에게 부상을 입힐 수 있습니다.

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BRĪDINĀJUMS

Šī apkopes rokasgrāmata ir pieejama tikai angļu valodā.

(LV)

(LT)

(NO)

• Ja klienta apkopes sniedzējam nepieciešama informācija citā valodā, klienta pienākums ir nodrošināt tulkojumu.

• Neveiciet aprīkojuma apkopi bez apkopes rokasgrāmatas izlasīšanas un saprašanas.

• Šī brīdinājuma neievērošanas rezultātā var rasties elektriskās strāvas trieciena, mehānisku vai citu faktoru izraisītu traumu risks apkopes sniedzējam, operatoram vai

pacientam.

ĮSPĖJIMAS

Šis eksploatavimo vadovas yra tik anglų kalba.

• Jei kliento paslaugų tiekėjas reikalauja vadovo kita kalba – ne anglų, suteikti vertimo

paslaugas privalo klientas.

• Nemėginkite atlikti įrangos techninės priežiūros, jei neperskaitėte ar nesupratote šio

eksploatavimo vadovo.

• Jei nepaisysite šio įspėjimo, galimi paslaugų tiekėjo, operatoriaus ar paciento sužalojimai dėl elektros šoko, mechaninių ar kitų pavojų.

ADVARSEL

Denne servicehåndboken nnes bare på engelsk.

• Hvis kundens serviceleverandør har bruk for et annet språk, er det kundens ansvar å sørge for oversettelse.

• Ikke forsøk å reparere utstyret uten at denne servicehåndboken er lest og forstått.

• Manglende hensyn til denne advarselen kan føre til at serviceleverandøren, operatøren eller pasienten skades på grunn av elektrisk støt, mekaniske eller andre farer.

(PL)

(PT-BR)

OSTRZEŻENIE

Niniejszy podręcznik serwisowy dostępny jest jedynie w języku angielskim.

• Jeśli serwisant klienta wymaga języka innego niż angielski, zapewnienie usługi tłumaczenia jest obowiązkiem klienta.

• Nie próbować serwisować urządzenia bez zapoznania się z niniejszym podręcznikiem serwisowym i zrozumienia go.

• Niezastosowanie się do tego ostrzeżenia może doprowadzić do obrażeń serwisanta, operatora lub pacjenta w wyniku porażenia prądem elektrycznym, zagrożenia mechanicznego bądź innego.

AVISO

Este manual de assistência técnica encontra-se disponível unicamente em inglês.

• Se outro serviço de assistência técnica solicitar a tradução deste manual, caberá ao cliente fornecer os serviços de tradução.

• Não tente reparar o equipamento sem ter consultado e compreendido este manual de assistência técnica.

• A não observância deste aviso pode ocasionar ferimentos no técnico, operador ou paciente decorrentes de choques elétricos, mecânicos ou outros.

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ATENÇÃO

Este manual de assistência técnica só se encontra disponível em inglês.

(PT-PT)

(RO)

(RU)

• Se qualquer outro serviço de assistência técnica solicitar este manual noutro idioma, é

da responsabilidade do cliente fornecer os serviços de tradução.

• Não tente reparar o equipamento sem ter consultado e compreendido este manual de

assistência técnica.

• O não cumprimento deste aviso pode colocar em perigo a segurança do técnico, do

operador ou do paciente devido a choques eléctricos, mecânicos ou outros.

ATENŢIE

Acest manual de service este disponibil doar în limba engleză.

• Dacă un furnizor de servicii pentru clienţi necesită o altă limbă decât cea engleză, este

de datoria clientului să furnizeze o traducere.

• Nu încercaţi să reparaţi echipamentul decât ulterior consultării şi înţelegerii acestui

manual de service.

• Ignorarea acestui avertisment ar putea duce la rănirea depanatorului, operatorului sau

pacientului în urma pericolelor de electrocutare, mecanice sau de altă natură.

ОСТОРОЖНО!

Данное руководство по техническому обслуживанию представлено только на английском языке.

• Если сервисному персоналу клиента необходимо руководство не на английском, а на

каком-то другом языке, клиенту следует самостоятельно обеспечить перевод.

• Перед техническим обслуживанием оборудования обязательно обратитесь к

данному руководству и поймите изложенные в нем сведения.

• Несоблюдение требований данного предупреждения может привести к тому, что

специалист по техобслуживанию, оператор или пациент получит удар электрическим током, механическую травму или другое повреждение.

(SR)

(SK)

UPOZORENJE

Ovo servisno uputstvo je dostupno samo na engleskom jeziku.

• Ako klijentov serviser zahteva neki drugi jezik, klijent je dužan da obezbedi prevodilačke

usluge.

• Ne pokušavajte da opravite uređaj ako niste pročitali i razumeli ovo servisno uputstvo.

• Zanemarivanje ovog upozorenja može dovesti do povređivanja servisera, rukovaoca ili

pacijenta usled strujnog udara ili mehaničkih i drugih opasnosti.

UPOZORNENIE

Tento návod na obsluhu je k dispozícii len v angličtine.

• Ak zákazníkov poskytovateľ služieb vyžaduje iný jazyk ako angličtinu, poskytnutie

prekladateľských služieb je zodpovednosťou zákazníka.

• Nepokúšajte sa o obsluhu zariadenia, kým si neprečítate návod na obluhu a

neporozumiete mu.

• Zanedbanie tohto upozornenia môže spôsobiť zranenie poskytovateľa služieb,

obsluhujúcej osoby alebo pacienta elektrickým prúdom, mechanické alebo iné ohrozenie.

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ATENCION

Este manual de servicio sólo existe en inglés.

(ES)

(SV)

(SL)

• Si el encargado de mantenimiento de un cliente necesita un idioma que no sea el inglés, el cliente deberá encargarse de la traducción del manual.

• No se deberá dar servicio técnico al equipo, sin haber consultado y comprendido este

manual de servicio.

• La no observancia del presente aviso puede dar lugar a que el proveedor de servicios, el operador o el paciente sufran lesiones provocadas por causas eléctricas, mecánicas o de otra naturaleza.

VARNING

Den här servicehandboken nns bara tillgänglig på engelska.

• Om en kunds servicetekniker har behov av ett annat språk än engelska, ansvarar kunden för att tillhandahålla översättningstjänster.

• Försök inte utföra service på utrustningen om du inte har läst och förstår den här

servicehandboken.

• Om du inte tar hänsyn till den här varningen kan det resultera i skador på serviceteknikern, operatören eller patienten till följd av elektriska stötar, mekaniska faror eller andra faror.

OPOZORILO

Ta servisni priročnik je na voljo samo v angleškem jeziku.·

• Če ponudnik storitve stranke potrebuje priročnik v drugem jeziku, mora stranka zagotoviti prevod.·

• Ne poskušajte servisirati opreme, če tega priročnika niste v celoti prebrali in razumeli.·

• Če tega opozorila ne upoštevate, se lahko zaradi električnega udara, mehanskih ali

drugih nevarnosti poškoduje ponudnik storitev, operater ali bolnik.

(TR)

DİKKAT

Bu servis kılavuzunun sadece ingilizcesi mevcuttur.

• Eğer müşteri teknisyeni bu kılavuzu ingilizce dışında bir başka lisandan talep ederse, bunu tercüme ettirmek müşteriye düşer.

• Servis kılavuzunu okuyup anlamadan ekipmanlara müdahale etmeyiniz.

• Bu uyarıya uyulmaması, elektrik, mekanik veya diğer tehlikelerden dolayı teknisyen, operatör veya hastanın yaralanmasına yol açabilir.

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Table of Contents

Compliance ........................................................................................................................................................................xviii

Components of the Certied Systems ..................................................................................................................xviii

Component Description ...............................................................................................................................................xviii

Exceptions ..........................................................................................................................................................................xviii

Monitor System EMC: Immunity Performance ..................................................................................................xviii

About this Manual .................................................................................................................. 1

Scope and Intended Users ............................................................................................................................................. 1

Conventions ............................................................................................................................................................................ 1

User Responsibility .............................................................................................................................................................. 1

References ...............................................................................................................................................................................2

Denitions of Terms ............................................................................................................................................................ 2

Symbols .................................................................................................................................................................................... 3

Important Safety Information ............................................................................................ 5

Warnings, Cautions and Notes ...................................................................................................................................... 6

Electromagnetic Interference ........................................................................................................................................9

Chapter 1: System Description ......................................................................................... 11

1.1 System Overview ....................................................................................................................................................... 11

1.2 Front Panel Controls, Indicators, and Connectors ..................................................................................... 13

1.3 Display Description ................................................................................................................................................... 15

1.3.1 Primary Labor Parameters ..................................................................................................................... 16

1.3.2 Additional Parameters ............................................................................................................................. 16

1.3.3 Waveform ....................................................................................................................................................... 16

1.3.4 Time ................................................................................................................................................................... 16

1.3.5 Softkeys ........................................................................................................................................................... 16

1.4 Rear Panel Descriptions ......................................................................................................................................... 19

1.5 Peripherals Description ........................................................................................................................................... 21

1.5.1 CorometricsTM 340 Telemetry and Mini Telemetry ..................................................................... 21

1.5.2 Quantitative Sentinel/Perinatal System ........................................................................................... 22

1.5.3 Exergen® TAT-5000

TM .............................................................................................................................................................. 22

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Table of Contents

1.5.4 DINAMAP® Models PRO Series 100-400 and ProCare ............................................................... 22

1.6 Theory of Operation ................................................................................................................................................ 23

1.6.1 Digital System Processor (DSP) / Display Board ........................................................................... 23

1.6.2 Main Board ..................................................................................................................................................... 25

1.6.3 User-Interface Keypad & Volume/Alarm Keypad Boards ........................................................ 26

1.6.4 Video Decoder Board ................................................................................................................................ 26

1.6.5 Recorder Board ............................................................................................................................................ 26

1.6.6 Communications Board ........................................................................................................................... 26

1.6.7 MSpO2 Connector Board ......................................................................................................................... 26

1.6.8 MSpO2 Carrier Board ................................................................................................................................. 27

1.6.9 FECG/UA Board.............................................................................................................................................27

1.6.10 MECG Board ................................................................................................................................................ 27

1.6.11 Dual Ultrasound Board .......................................................................................................................... 27

1.6.12 Isolated Power Supply Board .............................................................................................................. 28

1.6.13 Front-End Motherboard .........................................................................................................................28

1.6.14 Memory Battery ........................................................................................................................................ 28

Chapter 2: Installation ........................................................................................................ 29

2.1 Time Required for Installation .............................................................................................................................. 29

2.2 Environmental Requirements .............................................................................................................................. 29

2.3 Tool Requirements .................................................................................................................................................... 29

2.4 Installation Procedure ............................................................................................................................................. 29

2.4.1 Strip Chart Recorder Paper Load ......................................................................................................... 29

2.4.2 Peripheral Connections ............................................................................................................................ 31

2.4.3 Power Cord Attachment...........................................................................................................................31

2.4.4 System Conguration ............................................................................................................................... 31

Chapter 3: Maintenance and Checkout .......................................................................... 35

3.1 Procedures Schedule ............................................................................................................................................... 35

3.1.1 Environmental Requirements ................................................................................................................ 36

3.2 Tool Requirements .................................................................................................................................................... 36

3.3 Maintenance and Checkout Procedures ........................................................................................................ 36

3.3.1 Visual Inspection.......................................................................................................................................... 36

3.3.2 Cleaning (Thermal Print Head) .............................................................................................................. 37

3.3.3 Transducer Checks ..................................................................................................................................... 37

3.3.4 Functional Checks ....................................................................................................................................... 38

3.3.5 Pattern Memory Check ............................................................................................................................. 49

3.3.6 NIBP Calibration Check ............................................................................................................................. 52

3.3.7 Electrical Safety Tests ............................................................................................................................... 52

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Table of Contents

Chapter 4: Calibration ......................................................................................................... 55

4.1 Calibration Schedule ................................................................................................................................................ 55

4.2 Environmental Requirements .............................................................................................................................. 56

4.3 Tool Requirements .................................................................................................................................................... 56

4.4 Calibration Procedures ........................................................................................................................................... 56

4.4.1 NIBP Calibration Check ............................................................................................................................. 56

4.4.2 Recorder Photosensors Check .............................................................................................................. 59

4.4.3 Recorder Calibration (osets) Check .................................................................................................. 61

Chapter 5: Diagnostics and Troubleshooting ................................................................. 63

5.1 General Troubleshooting Table ........................................................................................................................... 63

5.2 Ultrasound Troubleshooting Table .................................................................................................................... 67

5.3 FECG Troubleshooting Table ................................................................................................................................ 69

5.4 External Uterine Activity Troubleshooting Table.........................................................................................70

5.5 Internal Uterine Activity Troubleshooting Table .........................................................................................72

5.6 MECG Troubleshooting Table ............................................................................................................................... 73

5.7 Blood Pressure Troubleshooting Table ............................................................................................................ 73

5.8 Maternal Pulse Oximetry Troubleshooting Table ....................................................................................... 75

5.9 Main Board Troubleshooting – Voltage Checks ..........................................................................................76

5.10 FECG/UA Board Troubleshooting – Voltage Adjustments .................................................................... 77

5.11 Recorder Troubleshooting .................................................................................................................................. 77

5.11.1 Vertical Oset Adjustment ................................................................................................................... 77

5.11.2 Horizontal Oset Adjustment .............................................................................................................. 79

5.11.3 Light Printing ............................................................................................................................................... 80

Chapter 6: Repair and Replacement Procedures ........................................................... 85

6.1 Top Cover, Top Cover Gasket, and Timekeeping RAM Chip Replacement ...................................... 86

6.2 Speaker Replacement ............................................................................................................................................. 87

6.3 DSP/Display Board Replacement.......................................................................................................................88

6.4 Communication Board Replacement ...............................................................................................................89

6.5 Pneumatics Assembly Replacement ................................................................................................................ 90

6.6 Main Board Replacement ...................................................................................................................................... 92

6.7 Display Assembly Replacement ......................................................................................................................... 93

6.8 Power Switch Assembly Replacement ............................................................................................................ 95

6.9 Trim Knob Control Assembly Replacement .................................................................................................. 96

6.10 Keypads Replacement ......................................................................................................................................... 97

6.11 Main Power Supply / Fan Replacement ....................................................................................................... 99

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Table of Contents

Chapter 7: Service Parts ................................................................................................... 117

6.12 Dual Ultrasound Board Replacement .........................................................................................................101

6.13 FECG/UA Board and MECG Board Replacement ....................................................................................102

6.14 SpO2 Carrier Board (with Nellcor/Masimo SpO2 Module) Replacement ....................................103

6.15 Isolated Power Supply Board Replacement .............................................................................................104

6.16 Front-end Motherboard Replacement ........................................................................................................105

6.17 Recorder Assembly and Recorder Door Button Replacement ........................................................107

6.18 Recorder Board Replacement .........................................................................................................................109

6.19 Recorder Stepper Motor Replacement .......................................................................................................110

6.20 Recorder Paper-Out/Paper-Low Photosensor Replacement ...........................................................111

6.21 Recorder Paper-Loading Photosensor Replacement ..........................................................................113

6.22 Recorder Thermal Print Head Replacement ............................................................................................114

6.23 Front Bezel Replacement ..................................................................................................................................115

7.1 Illustrated Parts ........................................................................................................................................................118

7.2 Labels ............................................................................................................................................................................123

7.3 Power Cords ...............................................................................................................................................................124

7.4 FRU List .........................................................................................................................................................................125

Appendix A: Technical Specications ............................................................................. 131

A.1 General Product Specications ........................................................................................................................132

A.2 Strip Chart Recorder Specications ................................................................................................................133

A.3 Operating Modes Specications ......................................................................................................................134

Appendix B: Alarm Summary .......................................................................................... 141

Appendix C: Electromagnetic Compatibility ................................................................ 143

C.1 Manufacturer’s Guidance and Declaration – Electromagnetic Emissions ...................................143

C.2 Manufacturer’s Guidance and Declaration – Electromagnetic Immunity ...................................144

C.3 Recommended Separation Distances ...........................................................................................................146

C.4 Compliant Cables and Accessories .................................................................................................................146

Appendix D: PS320 Fetal Simulator Setup ..................................................................... 149

D.1 Parts Required ..........................................................................................................................................................149

D.2 PS320 Fetal Simulator Setup .............................................................................................................................150

Appendix E: Service Mode Screens .................................................................................. 153

Page 17

Table of Contents

E.1 Service Lock Screen ................................................................................................................................................154

E.2 Install Options Screens ..........................................................................................................................................155

E.3 Printing Setup Information ..................................................................................................................................159

E.4 Communications Setup Screen .........................................................................................................................159

E.5 Error Log Screen .......................................................................................................................................................160

E.6 Diagnostic Control Screen ...................................................................................................................................161

E.7 J102 Screen ................................................................................................................................................................162

E.8 NIBP Calibration Screen ........................................................................................................................................163

E.9 Setup Screen Defaults ...........................................................................................................................................163

E.9.1 Operator Setup Screens .........................................................................................................................164

E.9.2 Service Mode Screens .............................................................................................................................167

Appendix F: CPU Software Upgrade ................................................................................169

F.1 Tool Requirement .....................................................................................................................................................169

F.2 Upgrade Procedure .................................................................................................................................................169

Appendix G: CorometricsTM 325 Simulator Setup and Use .......................................... 171

G.1 Simulator Setup .......................................................................................................................................................171

G.2 Alarms Check ............................................................................................................................................................171

G.3 MECG Input Check ..................................................................................................................................................174

G.4 FECG Input Check....................................................................................................................................................175

G.5 Ultrasound Input Check .......................................................................................................................................177

G.6 Uterine Activity Check ..........................................................................................................................................178

G.7 Pattern Memory Check ........................................................................................................................................179

G.8 Dual Heart Rate Check (Non-Pattern, FECG/US Modes) .......................................................................180

G.9 Dual Heart Rate Check (Non-Pattern, Dual US Modes) .........................................................................181

G.10 Fetal Movement Detection Check ................................................................................................................182

Page 18

Compliance

A GE brand Corometrics™ 250cx Series Monitor bears CE mark CE-0459 indicating its conformity with the

provisions of the Council Directive 93/42/EEC concerning medical devices and fullls the essential requirements of Annex I of this directive.

The device is manufactured in India; the CE mark is applied under the authority of Notied Body GMED (0459).

The country of manufacture and appropriate Notied Body can be found on the equipment labeling.

The product complies with the requirements of standard EN 60601-1-2 “Electromagnetic Compatibility— Medical Electrical Equipment” and standard EN 60601-1 “General Requirements for Safety.”

Components of the Certied Systems

The IEC electromagnetic compatibility (EN) standards require individual equipment (components and accessories) to be congured as a system for evaluation. For systems that include a number of dierent equipment that perform a number of functions, one of each type of equipment shall be included in the

evaluation.

The equipment listed below is representative of all possible combinations. For individual equipment certication, refer to the appropriate declarations of conformity.

Component Description

• 250cx Series Maternal/Fetal Monitor

• Model 146 Fetal Acoustic Stimulator

• Intrauterine Pressure Transducer

• FECG Cable/Legplate

• Ultrasound Transducers (x2)

• Blood Pressure Hose and Cu

• MSpO2 Interconnect Cable and Sensor

• MECG Cable

• FECG/MECG Adapter Cable

• Remote Event Marker

• RS-232C Interconnect Cables (x3)

• Central Nurses Station Interconnect Cable

• Model 2116B Keyboard and Interconnect Cable

• Model 1563AAO Telemetry Cable

• Exergen® TAT-5000

• External 15” display

™

Exceptions

None

Monitor System EMC: Immunity Performance

Be aware that adding accessories or components, or modifying the medical device or system may degrade the EMI performance. Consult with qualied personnel regarding changes to the system conguration.

Page 19

About this Manual

Scope and Intended Users

This service manual describes the installation, maintenance, checkout, calibration and repair of the

CorometricsTM 250cx Series monitor. The intended users for this service manual are biomedical engineering

service providers of the hospitals and GE service personnel.

Conventions

WARNING:

A WARNING statement is used when the possibility of injury to the patient or the operator

exists.

CAUTION:

A CAUTION statement is used when the possibility of damage to the equipment exists.

SENSITIVE TO ELECTROSTATIC DISCHARGE CAUTION

An electrostatic discharge (ESD) Susceptibility symbol is displayed to alert service personnel that the part(s) are sensitive to electrostatic discharge and that static control procedures must be used to prevent damage to the equipment.

User Responsibility

This Product will perform in conformity with the description thereof contained in this manual and

accompanying labels and/or inserts, when assembled, operated, maintained and repaired in accordance

with the instructions provided. This Product must be checked periodically. A defective Product should not be

used. Parts that are broken, missing, plainly worn, distorted or contaminated should be replaced immediately. Should such repair or replacement become necessary, GE Healthcare recommends that a telephone or

written request for service advice be made to the nearest GE Healthcare Regional Service Center. This Product or any of its parts should not be repaired other than in accordance with written instructions provided by GE Healthcare and by GE Healthcare trained personnel. The Product must not be altered without GE Healthcare’s prior written approval. The user of this Product shall have the sole responsibility for any malfunction that results from improper use, faulty maintenance, improper repair, damage or alteration by anyone other than GE

Healthcare.

This Product is intended for use by clinical professionals who are expected to know the medical procedures, practices, and terminology required to monitor obstetrical patients. This manual documents all possible

parameters available in the CorometricsTM 250cx Series monitor. It is the responsibility of each hospital to

ensure that the Labor and Delivery sta is trained in all aspects of the selected model. The CorometricsTM 250cx Series monitor is designed to assist the perinatal sta by providing information regarding the clinical status of the mother and fetus during labor. The monitor does not replace observation and evaluation of the mother and fetus at regular intervals, by a qualied care provider, who will make diagnoses and decide on treatments or

Page 20

About this Manual

interventions. Visual assessment of the monitor display and strip chart must be combined with knowledge of patient history and risk factors to properly care for the mother and fetus.

WARNING:

This device shall not be repaired other than in accordance with written instructions provided

by GE Healthcare and by GE Healthcare trained personnel.

CAUTION:

Untied States federal law restricts this device to sale by or on the order of a licensed medical

practitioner.

References

The following table lists other manuals pertaining to the CorometricsTM 250cx Series monitor service manual:

References Orderable Part Number

CorometricsTM 250cx Series Monitor Operator’s Manual (English) 2036946-001 Corometrics

Mini Telemetry System Service Manual 2049821-001

Model 340 Service Manual 2006920-001

Fluke® PS320 Fetal Simulator User’s Manual Maternal/Fetal Monitoring Clinical Application Operator’s Manual 15457AA CorometricsTM Fetal Acoustic Stimulator Operator’s Manual 1168AA

Visit www.ukebiomedical.com

Denitions of Terms

Term Denition

BPM Beat Per Minute ECG Electrocardiogram

ESD Electro Static Discharge

FECG Fetal Electrocardiogram FHR Fetal Heart Rate

FAST Fetal Acoustic Stimulation Test FMD Fetal Movement Detection

HBC Heart Beat Coincidence

INOP Inoperable IUPC Intra-Uterine Pressure Catheter LCD Liquid Crystal Display

MECG Maternal Electrocardiogram

NIBP Non-Invasive Blood Pressure

REM Remote Event Marker SpO2 Pulse Oximeter Oxygen Saturation

TOCO Non-invasive method of measuring uterine activity

Page 21

About this Manual

Term Denition

UA Uterine Activity US Ultrasound

Symbols

This section identies the symbols that are displayed on the CorometricsTM 250cx Series monitor:

Equipment Symbols

TYPE BF EQUIPMENT: Type BF equipment is suitable for intentional external and internal application to the patient, excluding direct cardiac application. Type BF equipment has an

F-type applied part.

DEFIBRILLATOR-PROOF TYPE BF EQUIPMENT: Type BF equipment is suitable for intentional external and internal application to the patient, excluding direct cardiac application. Type BF equipment is type B equipment with an F-type isolated (oating) part. The paddles indicate the equipment is debrillator proof.

TYPE CF EQUIPMENT: Type CF equipment is suitable for intentional external and internal application to the patient, including direct cardiac application. Type CF equipment has an

F-type applied part.

DEFIBRILLATOR-PROOF TYPE CF EQUIPMENT: Type CF equipment is suitable for intentional external and internal application to the patient including direct cardiac application. Type CF equipment is F-type applied part that provides a higher degree of protection against electric shock than that provided by Type BF applied parts.

Consult accompanying documents.

Alternating Current (AC)

Ground Equalization Potential Post

POWER OFF: disconnection from the mains

POWER ON: connection to the mains

European Union Representative

Catalog Number

Serial Number

Manufacturer

Page 22

About this Manual

Equipment Symbols

practitioner.

disposed as unsorted municipal waste and must be collected separately. Please contact the

Page 23

Important Safety Information

The service information is important for the safety of both the patient and operator and also serves to enhance equipment reliability.

WARNING:

Before servicing the CorometricsTM 250cx Series monitor, read through this entire manual. As with all medical equipment, attempting to use this device without a thorough understanding of its operation may result in patient or user injury. This device should be serviced only by authorized service personnel. Additional precautions specic to certain procedures are found in the text of this manual.

The information contained in this service manual pertains only to those models of products which are marketed by GE Healthcare as of the eective date of this manual or the latest revision thereof. This service manual was prepared for exclusive use by GE Healthcare service personnel in light of their training and experience as well as the availability to them of parts, proper tools, and test equipment. Consequently, GE Healthcare provides this service manual to its customers purely as a business convenience and for the customer’s general information only without warranty of the results with respect to any application of such information.

Furthermore, because of the wide variety of circumstances under which maintenance and repair activities may be performed and the unique nature of each individual’s own experience, capacity, and qualications, the fact that a customer has received such information from GE Healthcare does not imply in any way that GE Healthcare deems said individual to be qualied to perform any such maintenance or repair service. Moreover, it should not be assumed that every acceptable test and safety procedure or method, precaution, tool, equipment, or device is referred to within, or that abnormal or unusual circumstances may not warrant or suggest dierent or additional procedures or requirements. This manual is subject to periodic review, update, and revision. Customers are cautioned to obtain and consult the latest revision before undertaking any service of the equipment.

WARNING:

The user or service sta should dispose of all the waste properly as per federal, state, and local waste disposal regulations. Improper disposal could result in personal injury and environmental

impact

Do not use malfunctioning equipment. If the system is under warranty, contact GE technical support at the number on the back of the manual PRIOR to performing any repairs on the system.

Page 24

Important Saftey Information

Warnings, Cautions and Notes

WARNING:

ACCIDENTAL SPILLS: In the event that uids are accidentally spilled on the monitor, take the monitor out of operation and inspect for damage.

WARNING:

APPLICATION: This monitor is not designed for direct cardiac connection.

WARNING:

CONDUCTIVE CONNECTIONS: Avoid making any conductive connections to applied parts (patient connection) which are likely to degrade safety.

WARNING:

CONDUCTIVE PARTS: Ensure that the conductive parts of the lead electrodes and associated

connectors do not contact other conductive parts including earth.

WARNING:

CONNECTIONS: The correct way to connect a patient to the monitor is to plug the electrode leads into the patient cable which in turn connects to the monitor. The monitor is connected to the wall socket by the power cord. Do not plug the electrode leads into the power cord, a wall socket, or an

extension cord.

WARNING:

DEFIBRILLATION: During debrillation, all personnel must avoid contact with the patient and monitor to avoid a dangerous shock hazard. In addition, proper placement of the paddles in relation to the electrodes is required to minimize harm to the patient.

WARNING:

DEFIBRILLATION PROTECTION: When used with the GE-recommended accessories, the monitor is protected against the eects of debrillator discharge. If monitoring is disrupted by the debrillation,

the monitor will recover.

WARNING:

ELECTRICAL SHOCK: To avoid electrical shock hazard, do not operate the monitor with the top cover

removed.

WARNING:

ELECTROMAGNETIC INTERFERENCE: Strong electromagnetic elds may interfere with monitor operation. Interference prevents the clear reception of signals by the monitor. If the hospital is close to a strong transmitter such as TV, AM or FM radio, police or re stations, a HAM radio operator, an airport, or cellular phone, their signals could be picked up as monitor signals. If you feel interference is aecting the monitor, contact your service representative to check the monitor in your environment. Refer to Electromagnetic Interference section for additional information.

WARNING:

ELECTROSURGERY: The monitor is not designed for use with high-frequency surgical devices. In addition, measurements may be aected in the presence of strong electromagnetic sources such as electrosurgery equipment.

Page 25

Important Saftey Information

WARNING:

EXPLOSION HAZARD: Do not use this equipment in the presence of ammable anesthetics or inside

an oxygen tent.

WARNING:

GROUNDING: To avoid electrical shock hazard to the patient or the operator, do not defeat the three-wire grounding feature of the power cord by means of adaptors, plug modications, or other

methods.

WARNING:

INOPERABLE MECG: The MECG trace is not visible during a LEADS OFF condition or an overload (saturation) of the frontend amplier during dierential input voltage of more than ±300mV.

WARNING:

INSTRUCTIONS: For continued and safe use of this equipment, it is necessary to follow all listed

instructions. However, the instructions provided in this manual in no way supersede established

medical procedures concerning patient care. The monitor does not replace observation and evaluation of the patient, at regular intervals, by a qualied care provider who will make diagnoses

and decide on treatments and interventions

WARNING:

INTERFACING OTHER EQUIPMENT: Monitoring equipment must be interfaced with other types of medical equipment by qualied biomedical engineering personnel. Consult manufacturers’ specications to maintain safe operation.

WARNING:

LEAKAGE CURRENT TEST: The interconnection of auxiliary equipment with this device may increase the total leakage current. When interfacing with other equipment, a test for leakage current must be performed by qualied biomedical engineering personnel before using with patients. Serious injury or death could result if the leakage current exceeds applicable standards. The use of accessory equipment not complying with the equivalent safety requirements of this equipment may lead to a reduced level of safety of the resulting system. Consideration relating to the choice shall include: use of the accessory in the patient vicinity; and evidence that the safety certication of the accessory has been performed in accordance with the appropriate EN60601.1 harmonized

national standard.

WARNING:

LINE ISOLATION MONITOR TRANSIENTS: Line isolation monitor transients may resemble actual cardiac waveforms, and thus cause incorrect heart rate determinations and alarm activation (or inhibition).

WARNING:

MRI USE: Do not use the electrodes during MRI scanning. Conducted current could potentially cause

burns.

WARNING:

PATIENT CABLES AND LEADWIRES: Do not use patient cables and electrode leads that permit direct connection to electrical sources. Use only “safety” cables and leadwires. Use of non-safety patient cables and leadwires creates risk of inappropriate electrical connection which may cause patient

shock or death.

Page 26

Important Saftey Information

WARNING:

PACEMAKER PATIENTS: Rate meters may continue to count the pacemaker rate during occurrences of cardiac arrest or some arrhythmias. Do not rely entirely upon rate meter alarms. Keep pacemaker patients under close surveillance. For disclosure of the pacemaker pulse rejection capability of the monitor, refer to Appendix A.

WARNING:

RF INTERFACE: Known RF sources, such as cell phones, radio or TV stations, and two-way radios, may cause unexpected or adverse operation of this device.

WARNING:

SIMULTANEOUS DEVICES: Do not simultaneously connect more than one device that uses electrodes to detect ECG and/or respiration to the same patient. Use of more than one device in this manner may cause improper operation of one or more of the devices.

WARNING:

STRANGULATION: Make sure all patient cables, leadwires, and tubing are positioned away from the patient’s head to minimize the risk of accidental strangulation.

WARNING:

WATER BIRTHS: Do not use the monitor to directly monitor patients during water births, in whirlpool

or submersion water baths, during showers, or in any other situation where the mother is immersed

in water. Doing so may result in electrical shock hazard.

WARNING:

EXTERNAL VGA CONNECTIONS: Connect only to GE-recommended display. ONLY remove cover plate if external display is used.

WARNING:

TELEMETRY CONNECTIONS: Connect only to GE-recommended telemetry system. Contact your GE service representative for more information.

WARNING:

COLOR DISPLAY: Certain colors may have limited visibility at a distance. Color-blind individuals may experience this more often.

WARNING:

EXERGEN® TAT-5000™: Cable assembly 2036641-001, 2036641-002, 2036641-003, and 2036641-

004 cannot be eld serviced. Do NOT attempt any repairs to this assembly. This assembly must be returned to the factory for any repairs. This assembly, as shipped, is important to patient safety.

WARNING:

DISPOSAL: This product consists of devices that may contain mercury, which must be recycled or disposed of in accordance with local, state, or country laws. (Within this system, the backlight lamps in the monitor contain mercury).

CAUTION:

ANNUAL SERVICING: For continued safety and performance of the monitor, verify the calibration, accuracy, and electrical safety of the monitor annually. Contact your GE service representative.

Page 27

Important Saftey Information

CAUTION:

DAILY TESTING: It is essential that the monitor and accessories be inspected every day. It is recommended practice to initiate the monitor’s selftest feature at the beginning of each monitoring

session.

CAUTION:

ENVIRONMENT: The performance of the monitor has not been tested in certain areas, such as x-ray and imaging suites. The monitor is not recommended for use in these environments.

CAUTION:

EQUIPMENT CONFIGURATION: The equipment or system should not be used adjacent to, or stacked with, other equipment. If adjacent or stacked use is necessary, the equipment or system should be tested to verify normal operation in the conguration in which it is being used.

CAUTION:

PERFORMANCE: Report all problems experienced with the monitor. If the monitor is not working properly, contact your service representative for service. The monitor should not be used if it is not

working properly.

CAUTION:

PINCHING: Keep ngers clear of the paper roller because the roller could pinch your ngers.

CAUTION:

STATIC ELECTRICITY: This assembly is extremely static sensitive and should be handled using

electrostatic discharge precautions.

CAUTION:

TRAPPING: Keep hands, hair, jewelry, and loose clothing away from the paper roller because the

roller could trap these items.

CAUTION:

TRIPPING: Arrange monitoring equipment so that cords and cables do not present a tripping hazard.

Electromagnetic Interference

This device has been tested and found to comply with the limits for medical devices to the IEC 60601-1-2: 2007, EN60601-1-2:2007, Medical Device Directive 93/42/EEC. These limits are designed to provide reasonable protection against harmful interference in a typical medical installation.

However, because of the proliferation of radio-frequency transmitting equipment and other sources of electrical noise in the health-care and home environments (for example, cellular phones, mobile two-way radios, electrical appliances), it is possible that high levels of such interference due to close proximity or strength of a source, may result in disruption of performance of this device.

Refer to the Electromagnetic Immunity information in this product’s service manual for EN 60601-1-2 (2007) Edition 3 compliance information and safety information for this product.

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with these instructions, may cause harmful interference with other devices in the vicinity. Disruption or interference may be evidenced in the form of erratic readings, cessation of operation, or incorrect

Page 28

Important Saftey Information

functioning. If this occurs, the site of use should be surveyed to determine the source of this disruption, and

actions taken to eliminate the source.

The user is encouraged to try to correct the interference by one or more of the following measures:

• Turn equipment in the vicinity o and on to isolate the oending equipment.

• Reorient or relocate the other receiving device.

• Increase the separation between the interfering equipment and this equipment.

• If assistance is required, contact your GE service representative.

Page 29

Chapter 1: System Description

1.1 System Overview

The CorometricsTM 250cx Series monitor is a medical device for monitoring maternal/fetal parameters (Fetal Heart Rate, Uterine Activity, Maternal Non-Invasive Blood Pressure, Maternal Pulse Oximetry, and Maternal/ Fetal ECG) in labor and delivery (antepartum, intrapartum, and postpartum care). The monitor is equipped with an LCD display, which provides simultaneous display of fetal and maternal parameters plus the maternal waveforms, and a recorder, which prints continuous trends and alphanumeric data on one strip chart. The

system is compatible with Centricity® Perinatal Clinical Information Systems and other information systems to

streamline capture and archiving of patient data.

The CorometricsTM 250cx Series monitors are oered in two models:

1. Maternal/Fetal monitor (CorometricsTM 259cx): This model supports two Fetal Heart Rate (FHR) channels,

Uterine Activity (TOCO or IUP), Maternal Non-Invasive Blood Pressure (NIBP), Maternal Pulse Oximetry

(MSpO2), Fetal ECG (FECG), and Maternal ECG (MECG).

2. Fetal monitor (CorometricsTM 256cx): This model supports two Fetal Heart Rate (FHR) channels, Uterine

Activity (TOCO or IUP), and Fetal ECG (FECG).

Table 1-1: Monitor Models and Features

Monitor Model Features

Maternal/Fetal monitor (CorometricsTM 259cx)

Fetal Only monitor (CorometricsTM 256cx) US, US2, TOCO, IUP, FECG

Below optional components are also available to order:

A. Software Upgrade CD: The CD can be purchased to upgrade the monitor software to the latest version

using the RS-232 serial port of the monitor.

B. Spectra Alerts option: Each monitor unit can be upgraded to include Spectra Alerts option. This feature

analyzes heart rate and uterine activity data to detect certain abnormal trends and alert the clinician.

C. Fetal Movement Detection option: Each monitor unit can be software upgraded to include the Fetal

Movement Detection (FMD) software option. This feature is designed to detect gross fetal body

movements and body movements with associated limb movement.

US, US2, TOCO, IUP, FECG, MECG, NIBP, MSpO

Page 30

Chapter 1: System Description

Each monitor unit has its unique 13-Digit product serial number which contains embedded information about the unit manufacturing date and site (See Figure 1-1).

Product Code Description

SDJ 259CX-A (Nellcor, India Build) SDK 259CX-B (Nellcor, US Build) SDL 259CX-C (Masimo, India Build) SDM 259CX-D (Masimo, US Build) SDR 259CX-X (India Build)

Figure 1-1 Global Serial Number Format (13-Digit)

NOTE: For the refurbished (Gold Seal) CorometricsTM 259cx units, the unit serial number ends with letter “R” and

the the serial number label of the unit includes the text “259CX REMANUFACTURED”.

Page 31

1.2 Front Panel Controls, Indicators, and Connectors

Chapter 1: System Description

Figure 1-2 Front Panel View

A. Display: The monitor display is divided into several sections. The content and layout of the display can

change, depending on which functions are installed in the monitor and the modes of operation in use.

B. Trim Knob Control: Operation of the monitor is controlled by using the front panel buttons in

conjunction with the Trim Knob Control. This control selects softkeys on the display and positions a cursor within a setup screen. Rotate the Trim Knob Control left or right to highlight items on the screen with a bar cursor. After highlighting the desired item, press the Trim Knob Control to make the selection. In summary, rotate to move cursor and press to select an item.

C. NIBP Start/Stop Button: This button starts and stops both manual and automatic blood pressure

determinations. Pressing and holding this button provides a “shortcut” for changing the interval time of the NIBP cycle in the automatic mode.

D. Test Button: Pressing this button starts or stops a monitor self-test routine.

E. Mark [Oset] Button: The Mark [Oset] button is a multi-function button:

• Mark: Pressing this button prints an event mark ( ) on the bottom two lines of the top grid on the

strip chart paper.

• Oset: When the Heart Rate Oset mode is enabled, pressing and holding this button shifts the secondary FHR trend +20 bpm for visibility purposes.

Page 32

Chapter 1: System Description

F. UA Reference Button: This button sets a baseline for uterine activity pressure monitoring.

G. Paper Advance Button: Pressing this button advances the strip chart paper at a rate of 40 cm/min for

as long as the button is held down.

H. Record Button: This button selects one of three recorder states: on, maternal-only mode, or o.

I. Power Indicator: This LED indicator illuminates in green when the monitor is turned on.

J. Recorder Indicator: This LED indicator shows the status of the recorder as per below table:

Recorder Indicator Status What It Means

On Recorder is on.

O Recorder is o. Three short ashes every 5 seconds Recorder is in maternal-only mode. Flashes on and o Error condition

K. Light Button: This button illuminates the strip chart paper for better visibility.

L. Record Door Latch: This latch opens the strip chart recorder door for adding, removing, or adjusting

the paper.

M. Power Switch: Moving this switch to the ON position (I) turns on the monitor; moving the switch to the

OFF position (O) turns o the monitor.

N. Strip Chart Recorder: The recorder prints annotations and trends on the strip chart paper. Two paper

styles are available.

O. Maternal NIBP Connector: This connector is for attaching the blood pressure cu.

P. Maternal SpO2 Connector: Connect a 250cx Series MSpO2 intermediate cable to this connector. Use

only Nellcor Maternal Oxygen Saturation Sensors if Nellcor technology is installed in your monitor, or Masimo Sensors if Masimo technology is installed in your monitor.

Q. FECG/MECG Connector: Connect an FECG cable/legplate or MECG cable plug to this connector. Cables

with rectangular plugs connect directly to the FECG/MECG connector. Cables with round plugs require an FECG/MECG adapter. This adapter is used for dual ECG monitoring too. The adapter branches into two cables, each with a round connector at the end: one branch is labeled MECG; the other branch is

labeled FECG.

R. UA Connector: Connect a TOCO transducer or IUPC to this connector.

S. US2 Connector: Connect the secondary ultrasound transducer plug to this connector.

T. US Connector: Connect the primary ultrasound transducer plug to this connector.

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Chapter 1: System Description

U. Volume Button (FHR2 Decrease): This button is used to decrease the fetal heart rate (FHR2) sound

volume of the second ultrasound channel (US2). Volume settings have no eect on the processing used to determine heart rate. The Volume buttons work in conjunction with the volume control settings on

the US/US2 Setup screen and on the FECG Setup screen.

V. Volume Button (FHR2 Increase): This button is used to increase the fetal heart rate (FHR2) sound

the US/US2 Setup screen and on the FECG Setup screen.

W. Volume Button (FHR1 Decrease): This button is used to decrease the fetal heart rate (FHR1) sound

volume of the primary ultrasound channel (US). Volume settings have no eect on the processing used to determine heart rate. The Volume buttons work in conjunction with the volume control settings on

the US/US2 Setup screen and on the FECG Setup screen.

X. Volume Button (FHR1 Increase): This button is used to increase the fetal heart rate (FHR1) sound

the US/US2 Setup screen and on the FECG Setup screen.

Y. Alarm Silence Button: Pressing this button silences the audible indication of an individual alarm.

1.3 Display Description

Display Example: The graphic in Figure

1-3 gives the following information:

• Blood pressure (NIBP) is not active as indicated by the absence of

numerics.

• Maternal pulse oximetry (MSpO is active by presence of pulse

amplitude indicator.

• MECG is selected as the heart rate source as indicated by the MECG

mode title softkey—rather than

Pulse.

• The MECG waveform is displayed at 25 mm/sec, at a size of 2x, with lead II selected

• Heartbeat coincidence is enabled

as indicated by the HBC acronym in the primary labor parameters area.

• All alarms are enabled as indicated by  symbol.

)

Figure 1-3 Display Information Example

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Chapter 1: System Description

The monitor LCD display is designed to show the information listed below:

1.3.1 Primary Labor Parameters

These parameters, shown on the upper portion of the screen (See Figure 1-3), include Fetal Heart Rate 1 (FHR1), Fetal Heart Rate 2 (FHR2), and Uterine Activity (UA). Each parameter can have several modes depending on the type of its input.

Parameter Parameter Mode

Fetal Heart Rate 1 (FHR1) US, US2, FECG, or INOP Fetal Heart Rate 2 (FHR2) US, US2, or INOP Uterine Activity (UA) TOCO, IUP, or INOP

For FHR1 and FHR2 parameters, the FHR value is shown in beats per minute and the FHR mode is displayed

above the FHR value. For UA parameter, the UA value is shown in a user-selectable unit (mmHg or kPa) and the

UA mode is displayed above the UA value.

1.3.2 Additional Parameters

These parameters, shown on the middle portion of the screen (See Figure 1-3) are available in Maternal/ Fetal monitor models only. The parameters include Maternal Blood Pressure, Maternal Heart/Pulse Rate, and

Maternal SpO2. Each parameter can have several modes depending on the type of its input.

Parameter Parameter Mode

Maternal Blood Pressure NIBP Maternal Heart/Pulse Rate MECG, Pulse, or INOP

Maternal SpO

MSpO

1.3.3 Waveform

The monitor display can show Fetal ECG Waveform, Maternal ECG Waveform, or Maternal SpO2 Pulsatile Waveform on the bottom portion of the screen (See Figure 1-3). So the waveform can have several modes:

FECG, MECG, MSpO2, or O.

1.3.4 Time

The display also shows Current Time, [Label] Frozen Message and Time of Activation (See Figure 1-3).

1.3.5 Softkeys

The display includes several system conguration softkey controls (See Figure 1-4). A softkey is an area on the screen that can be selected with the Trim Knob Control. When the softkey is activated by pressing the Trim

Knob Control, it may cycle through available settings or it may display a setup screen.

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Description of softkeys:

Chapter 1: System Description

Figure 1-4 Display Softkeys

A. Mode Title Softkeys: Selects US, US2, FECG, NIBP, MHR/P, or MSpO2 Setup screens.

B. ECG Scale Softkey: Selects 0.25x, 0.5x, 1x, 2x, 4x, or Auto.

C. MECG Lead Softkey: Selects Lead I, II, or III.

D. VSHX Softkey: Displays maternal Vital Signs History screen (See Figure 1-5).

E. Setup Softkey: Displays General Setup screen.

NOTE: For detailed information on setup screens, refer to Appendix E.

F. Alarms Softkey: Displays Master Alarm Setup screen.

G. Freeze Softkey: Freezes waveform for analysis; unfreezes waveform to return to real-time display.

H. Print Softkey: Prints 6-second snapshot of frozen waveform, real-time waveform, or maternal vital

signs history.

I. Waveform Softkey: Selects FECG, MECG, MSpO2, or O.

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Chapter 1: System Description

Figure 1-5 Maternal Vital Signs History Screen Softkeys

A. Print Softkey: Prints one page (screen) of the table.

B. PrintAll Softkey: Prints all pages (screens).

C. View Softkey: Scrolls through the data Counterclockwise for newest data or Clockwise for oldest data

D. Exit Softkey: Returns to the previous screen.

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1.4 Rear Panel Descriptions

CAUTION:

The maximum nondestructive voltage that may be applied to the rear panel connectors is 0 volts. Do not connect cables to these connectors without ensuring the connectors comply with leakagecurrent requirements of one of the following applicable standards: UL 60601-1, CSA C22.2 No. 601.1 or IEC/EN 60601-1.

Chapter 1: System Description

Figure 1-6 Rear Panel View

A. Vent: Provides ventilation for the monitor internal circuitry.

B. Telemetry Connector (J101): Connector for CorometricsTM 340 or Mini Telemetry system interface.

C. Data Entry Connector (J103): This connector is specically designed for connecting to the legacy

CorometricsTM 2116B Data-Entry/Clinical-Notes Keyboard.

D. Nurse Call System (J104): This connector attaches to a standard Nurse Call System. The connector’s

maximum output is 50 Vdc at 100 mA and the maximum on resistance is 0.5 Ω. When connected to a Nurse Call System, the monitor will activate the system each time a Spectra Alert is issued. This interface simulates pressing the button on a bedside Nurse Call System allowing nurses to respond to

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Chapter 1: System Description

patient needs quickly and eciently. Although the J104 Nurse Call connector is physically present on the optional communications package, this connector is only supported as part of the Spectra Alerts option. The Spectra Alerts or Fetal Alarms can be enabled/disabled in Install Options Screen 2 in service mode screens (Refer to Fetal Alerts/Alarms description under See Figure E-3).

E. Central Systems Connector (J102): This Centronics-type connector is designed for interfacing to a

legacy Corometrics Spectra 400 Central Surveillance and Alert System or other compatible analog

central information system. This connector is often referred to as the Analog Interface Connector.

F. External VGA Connector (J112): This 15-pin sub-D connector is for interfacing to an external VGA

display. Use of GE-recommended external display will allow monitor front panel display video to be

replicated remotely.

G. Speaker: The rear panel speaker emits audible tones for heart rates, MSpO2 pulse with %O2-dependent

pitch, and alarms. It also provides the sound for the song player feature.

H. Communication Connectors (J109, J110, J111): These RJ-11 connectors provide three RS-232C serial

interfaces that allow connecting the monitor unit to the following peripheral devices:

• Nellcor Puritan Bennett (NPB) N-200 Maternal Oxygen Saturation Monitor (J109 and J111 only)

• DINAMAP® PRO Series 100-400 Monitors

• DINAMAP® ProCare, V100 Monitors

• Quantitative Sentinel/Perinatal System (any RS-232C connector)

Upon shipping from the factory, all three ports are congured as follows:

• Communication Mode = 1371/Notes

• baudrate (bps) = 2400

At the above settings, connectors J109 and J111 are ready for connection to an NPB Model N-200. Connector J110 does not support a connection to NPB monitors. Therefore, this connector will have to be congured to communicate to the peripheral device.

Pin Number Signal Name

1 RTS 2 RXD 3 GND 4 GND 5 TXD 6 CTS

Figure 1-7 J109, J110, J111 Pin Numbers and Names

I. ECG Out Connector: This 3-conductor stereo phone jack allows recording of FECG or MECG trends on

an external recorder. ECG signals are output at +80 dB with a bandwidth of 1.0 to 100 Hz. MECG signals

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Chapter 1: System Description

are output at +60 dB with a bandwidth of 0.5 to 40 Hz. The output level from this port is 10 V/mV for FECG and 1 V/mV for MECG.

J. Fetal Acoustic Stimulator Connector: Connector for CorometricsTM 146 Fetal Acoustic Stimulator

(FAST). A musical note symbol ( )prints on the strip chart paper each time CorometricsTM 146 is used.

K. Remote Event Marker Connector: This connector is for connection to an optional Corometrics Remote

Event Marker which is used to annotate the strip chart paper in the recorder with a mark. The mark can be congured as one of the below:

• The event symbol ( ) to record an “event”

• The fetal movement symbol ( ) to record the perceived fetal movement occurrence by the mother. This is the default setting.

L. Equipotential Lug: A binding post terminal is directly connected to the chassis for use as an

equipotential connection.

M. AC Voltage Selection Switch: This switch is intended for authorized service personnel to select the

proper voltage for the AC input:

• 120: Lets the unit accept an AC input in the range of 100–120 VAC.

• 240: Lets the unit accept an AC input in the range of 220–240 VAC.

N. Power Inlet Module: AC line power cord connector.

1.5 Peripherals Description

This section provides information about the peripheral systems that can be attached to the CorometricsTM

250cx Series monitors.

1.5.1 CorometricsTM 340 Telemetry and Mini Telemetry

CorometricsTM 250cx Series monitor can be interfaced to a CorometricsTM 340 Telemetry system (receiver) or a

Mini Telemetry system (receiver) thought J101 connector on the rear side of the monitor. Upon connecting the monitor to either telemetry systems, a “telemetry connected” symbol ( ) will appear beneath FHR1 eld on

the display when both the telemetry system and the monitor are turned on and the telemetry receiver detects

an active FECG, MECG, US, TOCO, or IUP mode from its corresponding transmitter. The “telemetry connected” symbol will also be printed on the bottom line of the top grid of the strip chart paper upon commencement of

the telemetry monitoring and every 30 minutes along with the modes.

NOTE: When any telemetry mode (US, FECG, MECG, TOCO, or IUP) is detected, all equivalent front panel modes

(US, US2, FECG, MECG, TOCO, or IUP) are ignored. You cannot “mix and match” telemetry and monitor

modes.

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Chapter 1: System Description

A “telemetry disconnected” symbol ( ) will be printed on the strip chart paper if the telemetry receiver is unplugged from the monitor, or the telemetry system (transmitter or receiver) is turned o, or the telemetry receiver does not detect any active mode information from its corresponding transmitter.

1.5.2 Quantitative Sentinel/Perinatal System

Through this interface, the monitor outputs MHR data, FHR data, and UA data to a central information such as

a Quantitative Sentinel/Perinatal System. Annotations made at the central station can be optionally printed on

the strip chart paper of the monitor as summarized below (if the central station has the capability to send the command):

• Each message is preceded by a computer icon ( ).

• Messages are restricted to a maximum length of 50 characters.

• Lower-case letters are converted to upper-case letters.

• Non-standard characters are replaced with spaces.

The monitor can be congured with the remote annotation capability enabled (1371/Notes mode) or disabled (1371 mode). Set the communication Mode to 1371 or 1371/Notes and the Baud rate to the specied value by the manufacturer in the Communication Setup screen (See Figure E-4).

To connect a central information system:

1. Obtain an appropriate interface cable: connect one end to an available RS-232C connector (J109, J110, or J111) on the monitor unit. Connect the other end to the wall plate wired to the central information system. For a Quantitative Sentinel/Perinatal System: the interface cable is catalog number (REF) 1558AAO (10’) or 1558BAO (20’); the corresponding wall plate connector is labeled RS-232 COMMUNICATIONS.

2. Access the Communications Setup service mode screen and set the baudrate and mode for the appropriate port to 1200 bps and either the 1371 or 1371/Notes mode, respectively. Then exit the service mode screens.

1.5.3 Exergen® TAT-5000

Exergen® TAT-5000™ provides maternal temperature as a printout and vital signs history. Set the communication Mode to Exergen and the Baud rate to 4800 in the Communication Setup screen (See Figure

E-4).

1.5.4 DINAMAP® Models PRO Series 100-400 and ProCare

All of the DINAMAP® Models PRO Series 100-400 ProCare, and V100 monitors can be interfaced to

CorometricsTM 250cx Series monitors using an ILC-1926 interface, one DINAMAP V-Link cable assembly (Part

number: 683235), and one CorometricsTM DINAMAP serial cable (Part number: 2007234-001) to provide a printout of the NIBP parameter on the strip chart paper. Set the communication Mode to Critikon and the Baud rate to the specied value by the manufacturer in the Communication Setup screen (See Figure E-4).

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Chapter 1: System Description

1.6 Theory of Operation

The CorometricsTM 250cx Series system is made up of front-end and back-end sections, system power supply, and recorder module. The Main board forms the heart of the monitor control functions. The Main board along with the communications board forms the back-end section of the monitor. The front-end section boards are housed in the sealed front-end card cage and consist of FECG/UA board, MECG board, Dual ultrasound board,

SpO2 carrier board, MSpO2 connector board, and the Frond-end motherboard. The DSP/Display board is the

bridge between the front-end and back-end sections. The recorder assembly houses the recorder board.

Figure 1-8 depicts the system block diagram of the monitor unit and illustrates all the boards, external parts, their connections (cable or direct plug-in), isolated areas, and the functionalities of the boards.

Upon power-up, the CorometricsTM 250cx Series monitor automatically performs a number of tests to verify

the integrity of the system memory, processor, and voltage levels before allowing the monitor to enter the normal operational mode. The pulse oximetry module is also tested (and automatically calibrated) upon power up or whenever the module is reset. After setting the Power switch to the on (I) position, the tests run for approximately 2 seconds. If all tests pass, the monitor enters the normal operational mode.

1.6.1 Digital System Processor (DSP) / Display Board

The DSP/Display board consists of two independent functioning sub-circuits: the DSP sub-circuit and the Display interface sub-circuit.

The DSP circuitry processes analog and digital data from the front-end modules and interfaces to the main processor. The ECG and ultrasound analog information is processed and heart rates are output to the Main board via a shared memory. Digital pressure information is received, processed, and also sent to the shared

memory.

The Display sub-circuit, consisting mainly of a shared memory and timing generator, provides the interface between the LCD and the main processor. Circuitry for the main processor to adjust the brightness of the LCD is provided through a DC-to-AC inverter. RS-232 communications between the Main board and the UI keypad board are routed through the DSP board.

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Chapter 1: System Description

Figure 1-8 System Block Diagram

Page 43

Chapter 1: System Description

1.6.2 Main Board

The Main board makes up the central processing unit for the monitor unit. The Main board accepts simultaneously processed parameters directly from four separate modules. The minimum conguration monitor has only the DSP board as an input module. Heart rate (ultrasound and or FECG), uterine activity data, mode information, and FMD data ow from the DSP board to the Main board via DSP board FPGA shared memory. Maternal and fetal Oximetry makes up the second and third modules. Information from these devices is passed to the Main board via RS-232 ports. The Main board communicates with the front panel UI keypad board using RS-232 interface, which is routed through the DSP board. The Main board also provides a master reset for the UI keypad board. The Main board holds the NIBP control circuitry (minus pump and valves) and communicates to it using a CMOS interface. The Main board connects to the Pneumatics board which holds the NIBP pump, valves, and lter. The Main board contains three external RS232 data ports for various external devices and setup/code update functions. The Main board receives data from the rear panel options board to allow the added Communication features. The Main board formats all the data and interfaces to the recorder board. The Main board also controls all of the audio functions including generated tones to passing ultrasound audio from the ultrasound board.

The Main board contains one dip switch pack (SW1) that determines some of the monitor congurations (See Table 1-2). The current settings of the SW1 switches can be checked without removing the unit top cover by accessing the Diagnostic Control screen (See section E.5), which displays the status of switches from left (i.e. switch number 8) to right (i.e. switch number 1). A “1” status means the corresponding switch is o and a “0” status means the corresponding switch is on. To change the switch settings, the unit top cover shall be removed to access the SW1 swtich. Below is an example of the SW1 switch status:

Table 1-2: SW1 Switch Settings

Switch Number Switch Name & Description Settings

1 Factory Test: For factory use only O = Enabled

J102 Output Levels: Select between J102 outputs compatible

with HP or Corometrics

O = HP

On = Corometrics

4 NIBP Option: Enable/disable the maternal NIBP. O = Enabled

MSpO2 Option: Select between the MSpO

options.

Nellcor: 5=O, 6=O Masimo: 5=On, 6=O

No MSpO2: 5=On, 6=On

7 Inactive Inactive 8 MECG Option: Enable/disable the MECG option. O = Enabled

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Chapter 1: System Description

1.6.3 User-Interface Keypad & Volume/Alarm Keypad Boards

The user-interface keypad board is responsible for two functions, a) input controls, and b) the recorder chart light feature. The board contains most of the front panel buttons (except for the volume and alarm cancel buttons) and receives input from the Trim Knob Control. The keypad is of the elastomeric type and utilizes backlight LEDs to light each key. The board also receives the volume/alarm keypad board inputs through an external cable, processes all key closures, and communicates the key statuses to the main processor. The Main board receives data from the main processor (routed through DSP/Display board) and controls the Recorder Indicator LED. The volume/alarm keypad board contains the volume and alarm key buttons and sends the button statuses to the user-interface keypad board. The volume/alarm keypad board is also of the elastomeric type and has backlight LEDs for each key. The user-interface keypad board interface with the Main board is through an RS-232 interface.

1.6.4 Video Decoder Board

The video decoder board interfaces between the DSP/Display board and the LCD panel. The video decoder board performs conversion of 4-bit color information from the FPGA output to the 18-bit color required by the LCD panel. This provides a 16-color palette. The translation is accomplished in the FPGA on the video decoder board. This board receives high-speed video from the DSP/Display board.

1.6.5 Recorder Board

The recorder board is responsible for driving the recorder motor and the recorder print head device along with providing the main system board with paper out/low/misload status. To drive the motor it receives pulses from

the main system board and provides the proper drive circuitry to drive the stepper motor 4 phase windings.

To drive the print head an adjustable power supply is provided which is set to the print head specications (each print head is unique). Data to be printed and control information is received from the main system board, buered and presented to the print head. Sensors from the recorder assembly to detect paper low/out/misload

are received and translated to digital status lines to be sent to the main system board.

1.6.6 Communications Board

The communications board contains three basic interfaces. It supports the analog interface (J102) to the legacy Spectra 400 surveillance system as well as other manufacturer’s centrals, a 2116 external keyboard interface for strip chart annotation, and an analog telemetry interface to the CorometricTM 340 or Mini Telemetry system. The communications board communicates to the system by directly plugging into the main system board. Digital data from the keypad interface and telemetry (modes only) is transferred through a data bus and analog signals (MECG, FECG, Ultrasound, TOCO) from the telemetry are separately routed through the Main board to the DSP for processing similarly to the existing front panel patient data.

1.6.7 MSpO2 Connector Board

The MSpO2 connector board receives the universal SpO2 patient cables on the front bezel of the monitor unit and transfers the analog signals on to the internal SpO2 cable that in turn connects to the SpO2 Carrier board.

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Chapter 1: System Description

All the signals entering this board are patient isolated and signals leaving this board though the MSpO2 cable are also isolated.

1.6.8 MSpO2 Carrier Board

The SpO2 carrier board holds the SpO2 module. It receives MSpO2 patient cable connections from the universal front-end connector board and internal cable on its isolated side and routes them to the connected NELL3-S,

Nellcor MP-506 or NELL-3, or Masimo MS-11 or MS-2011 modules. It supplies isolated power to the SpO2 modules and transfers the isolated data generated by the modules using opto-couplers to the front-end motherboard on to the monitor system for processing. The monitor system is able to reset the maternal and

the SpO2 modules using opto-coupled reset lines.

1.6.9 FECG/UA Board

The FECG/UA board is made up of two separate isolated patient front-end sub-circuits: FECG and Uterine Activity. The FECG sub-circuit converts the low level signals received from the fetus through the spiral electrode to electrical impulses which are amplied, ltered, and sent across an isolation barrier. The un-isolated FECG signal then is further amplied and sent o the FECG board, routed by the front-end motherboard to the DSP/ Display board, where it is digitized and processed. Additionally, the FECG mode line (cable plugged in sense line) from the ECG connector is digitized and sent over the barrier via an opto-coupler where it is routed similarly to

the FECG analog signal.

The Uterine Activity sub-circuit processes the pressure signals from the external TOCO or IUP sensor (use same inputs), by amplifying and ltering the inputs, and then converts the signals via serial analog to digital (A/D) converter. The output of the A/D converter is then sent across the isolation barrier, routed through the frontend motherboard through to the DSP/Display board where it is further processed. Two mode lines from the UA patient connector are also digitized: TOCO present and IUP present (only one cable can be plugged in at a time). These signals are then sent over the barrier via an opto-coupler where they are routed similarly to the TOCO/ IUP digitized signals.

1.6.10 MECG Board

The MECG board processes the isolated MECG signals present from the ECG front panel connector. The multilead signals rst go through programmable lead switching circuitry controlled by the DSP processor. The MECG signal is then amplied and ltered and sent across the isolation barrier where it is routed through the frontend motherboard to the DSP/Display board, digitized and processed. The MECG board also contains an ECG test signal on the isolated side which is used when the monitor front panel test button is depressed. This tests most of the front-end circuitry paths. The MECG board also contains pacemaker detection circuitry allowing the monitor to blank out the pulses for proper counting.

1.6.11 Dual Ultrasound Board

The dual ultrasound board generates the ultrasound timing signals to pulse the external patient connected ultrasound transducer crystals and provides the necessary receive circuitry to detect the reected waveforms. It does this by rst demodulating the needed signal o of the carrier and ltering the signals which are then

Page 46

Chapter 1: System Description

sent through the frontend motherboard to the DSP where they are digitized and processed. No isolation is present from the patient connector through the ultrasound board as the plastic ultrasound transducer forms

the physical isolation barrier.

1.6.12 Isolated Power Supply Board

The isolated power supply board provides all of the isolated power for the FECG/UA board, MECG board and the carrier board which in turn feeds the two SpO2 modules (MSpO2). The ultrasound board is not powered from

this board as it is not electrically isolated. The isolated power supply is made up of two isolated sets of supplies. One supply set is specically for FECG on the FECG/UA board. The other isolated set of supplies powers the

remaining functions including TOCO/IUP (on the FECG/UA board), MECG (MECG board), and the SpO2 Carrier

board (SpO2 modules). The un-isolated power input to this PWA consists of +20 volts routed from the front-end

motherboard through the DSP and Main board and then nally the system power supply.

1.6.13 Front-End Motherboard

The front-end motherboard is a passive inter-connection board which houses all of the front-end parameters except for NIBP. In addition to the parameters, it holds the isolated power supply. The board routes all of the isolated and un-isolated signals to and from the DSP/Display board. This includes both analog and digital parameter inputs and digital control outputs. On the front-end side it interfaces to the pressure channel frontend cable and the FECG front-end cable, which carries all of the FECG signals as well as the MECG mode lines.

The MECG analog signals are routed separately from the front panel to the MECG daughter board. The MSpO2

input signals enter the SpO2 carrier board directly.

1.6.14 Memory Battery

Whenever the monitor is turned o, a battery provides power to the Random Access Memory (RAM) that stores information such as time, date, default settings, etc. An icon ( ) will appear in the upper right-hand section

of the monitor display in the following circumstance:

A. RAM data corruption: The ( ) icon appears for a short period of time after the system power-up

on the monitor display in data corruption conditions, which makes the monitor revert to the factory settings. To re-congure the settings, access the setup screens.

B. Bad Battery: The ( ) icon appears steadily after the system power-up on the monitor display when

the RAM battery has reached end-of-life and needs to be replaced.

NOTE: Always set the time and date prior to the initial operation of the monitor after the RAM battery

replacement. Update the settings during the daylight-saving time changes.

Page 47

Chapter 2: Installation

This chapter provides information required to install the CorometricsTM 250cx series monitor.

2.1 Time Required for Installation

The average installation time for the CorometricsTM 250cx series monitor is approximately 10 minutes. The required checkout procedures after installation takes approximately 30 minutes.

2.2 Environmental Requirements

The system shall be installed, serviced, and operated within the environmental conditions described in section

A.1.

2.3 Tool Requirements

None

2.4 Installation Procedure

2.4.1 Strip Chart Recorder Paper Load

CAUTION:

Use GE-approved recorder paper only. Using the wrong paper may damage the recorder print head

and product inferior print quality.

CAUTION:

The monitor recorder shall be loaded with the paper at all times. This reduces particle build-up on the print head and facilitates opening the recorder door.

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Chapter 2: Installation

To load strip chart recorder paper perform below steps:

1. Press down the latch on the right side of the strip chart recorder door (See Figure 2-1).

2. Fan the pack of Z-fold paper on all sides to loosen any folds and to ensure proper feed of the paper through the recorder.

3. Hold the package of paper such that the black squares are on the bottom of the pack and the Corometrics

logo and page numbers are on the left side of the pack (See Figure 2-2).

NOTE: The black squares indicate the end of the recorder paper. When the black squares appear, the strip chart

recorder has approximately 20 minutes of paper remaining, when running at a speed of 3 cm/min.

4. Unfold two sheets from the top of the package so that they extend toward you (See Figure 2-3).

5. Place the pack of paper in the drawer so that the pack is in a at position in the recorder (See Figure 2-4).

6. Slowly close the strip chart recorder door, being careful not to skew the paper (“Figure 2-5”).

Figure 2-1 Figure 2-2

Figure 2-3 Figure 2-4

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Chapter 2: Installation

2.4.2 Peripheral Connections

If present, connect the below optional peripherals to the CorometricsTM 250cx series monitor as per the following instructions:

Remote Event Marker: Plug the marker connector into its corresponding jack on the rear side of the monitor.

Corometric 340 Telemetry / Mini Telemetry system: Plug the interconnect cable (Part number: 1563AAO) into

the Telemetry Connector (J101) on the rear side of the unit (Refer to Corometric 340 Telemetry / Mini Telemetry service manuals for installation details).

External Video Display: Plug the display cable into the External Display Connector (J112) on the rear side of

the unit.

Quantitative Sentinel / Perinatal System: Plug the interface cable into an available RS-232C connector (J109, J110 or J111) on the rear side of the unit.

2.4.3 Power Cord Attachment

1. Conrm the monitor power switch is in o (O) position.

2. Connect the power cord to the power connector on the rear panel of the monitor and secure the power

cord with the P Clamp (See Figure 2-6).

3. Verify that the AC voltage selector on the rear panel of the monitor is set to the correct country-specic voltage (See Figure 2-6).

CAUTION:

Incorrect setting of the AC voltage selector can damage the monitor.

4. Plug the power cord into a power outlet.

2.4.4 System Conguration

1. Turn the monitor on. Conrm that the Power indicator (green light) illuminates, the monitor display is on, and the monitor generates a series of tones, indicating that the unit has been turned on.

Figure 2-5 Figure 2-6

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Chapter 2: Installation

2. Use the Trim Knob Control to select the Setup softkey to display the General Setup screen and set the correct date and time (“Figure 2-7”). Set the paper speed in accordance with the hospital or local requirements.

WARNING:

Incorrect paper speed setting results in inaccurate waveform prints on the strip chart paper.

3. Select the Service softkey on the screen to have the Service Lock screen with 0 0 0 0 access code displayed (“Figure 2-8”).

4. Use the Trim Knob Control to enter the access code as either the current month or day (MMDD) or day and month (DDMM), depending on how the monitor is congured. For example, April 23 shall be entered as 0 4 2

NOTE: To gain access to the service screens, the correct date and time must be set on the General Setup

screen.

5. Upon entering the access code, press the Trim Knob Control to access Install Options Screen 1 screen.

(“Figure 2-9”).

6. Use the Trim Knob Control to navigate on the screen and change the factory default settings if necessary (See Appendix E for conguration setting details). Make sure to set the paper scaling to match with the type of paper used.

WARNING:

Incorrect paper scaling setting (mismatch between the paper scaling and type of paper used) results in invalid waveform prints on the strip chart paper.

7. If any peripherals are installed to communicate to the monitor through RS-232C connectors, use the Trim Knob Control to select the COMM softkey on Install Options Screen 1 to access the Communication Setup screen (“Figure 2-10”). Use the Trim Knob Control to set the communication baud rates and modes to be compatible with the external peripheral device and then exit the screen. For more information on Communication Setup screen elds, refer to section E.4.

NOTE: For Quantitative Sentinel/Perinatal System, set the baud rate and mode for the appropriate port to 1200

bps and either the 1371 or 1371/Notes respectively.

8. Use the Trim Knob Control to select the NextPage softkey to access the Install Options Screen 2 screen and

change the factory default settings if necessary. (See Appendix E for conguration setting details).

9. To store the changed conguration settings as the monitor default settings, use the Trim Knob Control to select Store Current to Hospital option on the Install Options Screen 2 screen. Conrm the Default Setting option changes to Hospital (“Figure 2-11”).

WARNING:

When the monitor is turned on or restarted, the conguration settings revert back to the Default

Setting option selected, i.e. Factory or Hospital.

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Chapter 2: Installation

10. Use the Trim Knob Control to select Restart softkey to accept the settings and reboot the unit.

11. Perform the checkout procedures as instructed in chapter 3 before putting the monitor into use.

Figure 2-7

Figure 2-8 Figure 2-9

Figure 2-10 Figure 2-11

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Chapter 2: Installation

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Chapter 3: Maintenance and Checkout

This chapter includes planned maintenance procedures as well as checkout procedures required after

CorometricsTM 250cx series product installation, repair, or maintenance. These procedures must be performed

by authorized service personnel.

3.1 Procedures Schedule

Table 3-1 lists all planned maintenance and checkout procedures, species when and how often each procedure should be performed, and provides the approximate time taken to perform each procedure.

For good care and maintenance of the Corometrics

250cx series product, perform planned maintenance

procedures at specic time intervals. The checkout procedures should be performed after any installation,

repair, calibration, maintenance, or part replacement.

Table 3-1: Maintenance and Checkout Procedures Schedule

Procedure Name

Visual Inspection 2 minutes Annually YES Cleaning 2 minutes Annually As needed Transducers Checks 5 minutes Annually As needed Functional Checks 20 minutes Annually YES

NIBP Calibration Check 8 minutes Annually As needed Electrical Safety Tests 8 minutes Annually YES

Approximate

Time

To Be Performed as

Planned Maintenance

To Be Performed as Checkout after any

Service*

* Service includes installation, repair, calibration, maintenance, or part replacement.

WARNING:

Do not service the Corometrics

250cx series unit while it is in clinical use.

CAUTION:

Table 3-1 shows the minimum frequencies required for maintenance. Always follow hospital and local regulations for required frequencies.

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Chapter 3: Maintenance and Checkout

3.1.1 Environmental Requirements

The system shall be installed, serviced, and operated within the environmental conditions described in section

A.1.

3.2 Tool Requirements

The following table lists the service tools required to perform the planned maintenance and checkout

procedures:

Table 3-2: Tool Requirements for Planned Maintenance and Checkout Procedures

Procedure Name Service Tools Needed (QTY)

Visual Inspection None Cleaning (Thermal Print Head) Methanol or Isopropyl Alcohol, Cotton Swab, Sterile Gauze Transducers Checks None

PS320 Fetal Fluke® Simulator (2), Fluke® Mechanical Fetal Heart (1),

Functional Checks

NIBP Calibration Check

Electrical Safety Tests

Ultrasound Transducers(2), TOCO Transducer (1), Y Adapter Cable (1),

Ultrasound Gel

Adult Cu (1), 3" Cylinder (1), Standard 12-foot NIBP hose (1), External Manometer (1) capable of reading to 350mmHg (46.7 kPa), Hand Pump Bulb (1)

Electrical Safety Analyzer (1), Multimeter (1), MECG Cable (1), IUP Transducer (1), SpO2 Sensor (1), Ultrasound Transducer (1), some Aluminum Foil

3.3 Maintenance and Checkout Procedures

3.3.1 Visual Inspection

1. Unplug the monitor power cord from the power outlet and disconnect it from the monitor.

2. Examine the power cord for any signs of damage. Replace the power cord if damage is evident.

3. Conrm the power cord is secured to the monitor with the power cord retainer.

4. Inspect the overall unit (top cover, front bezel, screen display, connectors, front panel buttons) for any

damaged (cracked or broken) or missing parts. If any part is damaged or missing, replace it.

5. Inspect the unit for any missing labels. Make sure the labels are attached in the proper locations. For a list of labels, refer to section 7.2. For the proper location of each label, refer to Figure 7-4.

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Chapter 3: Maintenance and Checkout

3.3.2 Cleaning (Thermal Print Head)

NOTE: This section only includes the cleaning procedures to be performed by the service personnel. For a

complete list of general cleaning procedures to be performed by the operator, refer to the CorometricsTM 250cx series Operator’s Manual.

1. Conrm the monitor is turned o and the power cord is unplugged from the power outlet.

2. Use cotton swabs and methanol or isopropyl alcohol to clean the thermal print head heater elements and remove any accumulated paper dust.

NOTE: Do not touch the heater head with bare hands.

CAUTION:

Allow the cleaned elements to air dry completely prior to putting the unit back into use.

3.3.3 Transducer Checks

This section provides instructions to conrm the operational and functional performance of the transducers.

3.3.3.1 Ultrasound Transducer Checks

NOTE: Always use GE-approved transducers only.

1. Visually inspect the transducer case, the cable, the strain relief, and the connector pins for any signs of damage. Replace the transducer if damage is evident.

2. Turn the monitor on and connect the ultrasound transducer to either US or US2 input connector of the monitor unit and conrm that:

a. The FHR1 value shows three steady dashes “– – –.”

b. The FHR1 mode shows US.

c. The recorder prints US on the center margin of the strip chart paper after approximately 20 seconds.

3. Hold the ultrasound transducer in your hand with the transducer front facing the palm of your hand and

use your other hand to gently press and depress the back of the transducer rhythmically while maintaining a steady rate. Conrm the following:

a. The FHR1 value on the monitor follows the input rate.

b. The recorder follows the input rate.

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Chapter 3: Maintenance and Checkout

c. The FHR1 heartbeat indicator ( ♥ ) ashes for each input.

d. Ultrasound audio is generated from the speaker on the rear side of the monitor.

3.3.3.2 TOCO Transducer Checks

NOTE: Always use GE-approved transducers only.

1. Visually inspect the transducer case (especially on the diaphragm located on the bottom of the transducer), the cable, the strain relief, and the connector pins for any signs of damage. Replace the transducer if

damage is evident.

2. Turn the monitor on and connect the TOCO transducer to UA input connector of the monitor.

3. Use the Trim Knob Control of the monitor to access the Install Options Screen 2 and note the Default TOCO

Reference setting. Exit the service mode by selecting Restart at the bottom of the screen.

4. Momentarily depress the UA Reference Button of the monitor and conrm that:

a. The UA value shows the default setting.

b. The UA mode shows TOCO.

c. The recorder prints TOCO on the strip chart paper.

5. Apply gentle pressure to the TOCO transducer diaphragm and conrm that the UA value responds to the

pressure input. Increasing force should produce an increasing value and vice versa.

3.3.4 Functional Checks

This section provides instructions to conrm the operational and functional performance of the monitor unit.

NOTE: Always use GE-approved transducers only.

3.3.4.1 Indicators, Display, and Recorder Checks

1. Make sure that all transducers are disconnected from the front panel of the unit and the strip chart is loaded into the recorder.

2. Turn the unit power on. Conrm that the unit generates two tones from the rear panel speaker and the

Power Indicator (green light) illuminates.

3. Conrm that the monitor display is on and it is showing the General screen.

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Chapter 3: Maintenance and Checkout

4. If present, connect the external display to the monitor unit (J112 connector) and conrm the external

display mimic the monitor display content.

5. Turn the recorder on and depress the Mark Button on the front panel and verify that an event mark ( ) is

printed on the lowest portion of the HR scale on the recorder paper.

6. Use the Trim Knob Control to access the General Setup screen and take a note of the value set for paper

speed.

7. Depress the Record Button and conrm the following:

a. The yellow indicator next to the button illuminates continuously.

b. The recorder paper advances at a rate equal to the paper speed value in General Setup screen.

c. The recorder prints the correct time and date information on the strip chart paper.

d. The recorder prints the messages CARDIO INOP and UA INOP.

e. The recorder prints the paper speed value, 1 cm/min or 3 cm/min.

8. Depress and hold the Paper Advance Button on the front panel and verify that the recorder paper

advances at a rate of 40 cm/min by measuring.

9. Release the Paper Advance Button and verify that the recorder prints the paper speed value.

10. Access the Install Options Screen 1 screen again to change the paper speed and verify that the recorder

prints the correct paper speed value and also advances at the correct speed.

11. Make sure to set the paper speed in the General Setup screen in accordance with hospital or local

requirements.

WARNING:

Incorrect paper speed setting results in inaccurate waveform prints on the strip chart paper.

3.3.4.2 Self-Test Routine

1. Make sure GE-approved strip chart paper is loaded into the unit recorder.

2. Turn the unit power on.

3. Depress the Test Button and conrm the following:

a. Display Test: All display pixels extinguish for one second and then illuminate for one second. A green

horizontal line moves down on a red background followed by a blue vertical line moving from left to

right.

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Chapter 3: Maintenance and Checkout

b. Lamp Test: The yellow Record Indicator illuminates.

c. Recorder Test: The recorder prints the message TEST: ARE ALL DOTS PRINTED? followed by two vertical

lines and four horizontal lines. The two vertical lines should appear continuous and indicate a fully functional print head. The four horizontal lines align with the heart rate and uterine activity scales, i.e., 30 and 240 BPM or 50 and 210 BPM, and 0 and 100 mmHg (0.0 and 13.3 kPa).

NOTE: If the simulated fetal heart rate trends do not appear in the correct positions on the strip chart recorder

paper, ensure the monitor paper scale (30-240 bpm or 50-210 bpm) setting matches the type of paper being used, i.e., 30 bpm/cm or 20 bpm/cm (See Scaling in section E.2).

WARNING:

Incorrect paper scaling setting (mismatch between the paper scaling and type of paper used) results in invalid waveform prints on the strip chart paper.

d. Counting Test: After the recorder test, the display returns to the General screen. The software generates

a 120 bpm rate in the FHR1 area, a 180 bpm rate in the FHR2 area, and shows 50 mmHg in UA area and all mode titles display Test.

NOTE: To stop a self-test routine that is in progress, depress the Test Button or open the recorder door.

NOTE: The recorder returns to its original on, o, or maternal-only mode state before the Test Button was

depressed.

3.3.4.3 RS-232C Loopback Check

1. Turn on the monitor and use the Trim Knob Control to enter into service mode and access the Communication Setup screen.

2. Insert a loopback test connector into each RS-232C communication port (J109, J110, and J111) on the rear

side of the unit (See Figure 1-6).

NOTE: If a loopback test connector is not available, for each communication port manually bridge pin 2 (RXD)

and pin 5 (TXD) together (See Figure 1-7).

3. For each communication port, set the mode eld on the Communications Setup screen to Loopback and then press the Trim Knob Control to select it. Notice that the word OFF displays to the right of the mode.

4. Conrm that the status Loopback OK displays after a few seconds (See Figure E-4).

NOTE: OK indicates that the test has passed and OFF indicates test failure. Do not use the communication port

that fails the test. Contact service for repair.

5. Exit the Communication Setup screen and select Restart in the Install Options Screen 1 screen to reboot the monitor.

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Chapter 3: Maintenance and Checkout

3.3.4.4 Alarms Check

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

1. Make sure the monitor unit and the PS320 simulator are both turned o.

2. Connect a Y adapter cable (GE Part number: 1442AAO) to the monitor and then connect the 3-Lead MECG

cable (orderable through GE part number: 2025177-055) to the MECG connector of the Y adapter and the left panel terminals of the PS320 simulator as per below connection diagram (See Figure D-1):

3-Lead ECG Cable Terminal Name PS320 Simulator - Left Panel Terminal

Left Arm (LA) shall be connected to Fet/Mat

Left Leg (LL) shall be connected to Maternal

Right Arm (RA) shall be connected to Reference

3. Turn on the PS320 simulator and the monitor unit.

4. Use the Trim Knob Control of the monitor unit to select MECG to access the MHR/P Setup screen.

5. Set the MHR/P source to MECG.

6. Set HR/PR Trace to On.

7. Set the MHR/P high alarm limit value to 120 BPM.

8. Set the MHR/P low alarm limit value to 80 BPM.

9. Set the Alarm Volume to a level you can easily hear.

10. Exit the MHR/P Setup screen.

11. Use the PS320 simulator front panel to set the Maternal ECG parameters, MAT.(Rate) to 100 BPM and

Amplitude to 0.5mV.

NOTE: For PS320 simulator setup information, see Appendix D.

12. Set the MECG parameter on PS320 to 140 BPM as indicated on the monitor and conrm that:

a. An audio alarm (alternating high/low tones) is emitted from the rear panel speaker.

b. The MECG value ashes.

13. Depress the Alarm Silence Button on the monitor front panel and conrm that:

a. The audio alarm stops.

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Chapter 3: Maintenance and Checkout

b. The ALARM SILENCE X:XX message box appears on the screen and a countdown is started.

14. Wait for the user-specied re-alarm time to end and conrm that the audio alarm is once again generated

from the rear panel speaker.

15. Set the MECG parameter on PS320 to 120 BPM as indicated on the monitor and conrm that:

a. The audio alarm stops.

b. The MECG value no longer ashes.

c. After 10 seconds, the two above conditions are still true.

16. Set the MECG parameter on PS320 to 80 BPM. Conrm that no audio alarm is generated from the rear panel speaker.

17. Decrease the MECG rate to 60 BPM and conrm that:

a. The audio alarm is generated from the rear panel speaker.

b. The MECG value ashes.

18. Depress the Alarm Silence Button on monitor front panel and conrm that:

a. The audio alarm stops.

b. The MECG value continues ashing.

c. The message ALARM SILENCE X:XX appears on the screen and a countdown is started.

19. Wait for the user-specied re-alarm time to end and conrm that the audio alarm is once again generated

from the rear panel speaker.

20. Set the MECG parameter on PS320 to 80 BPM as indicated on the monitor and conrm that:

a. The audio alarm stops.

b. The MECG value no longer ashes.

c. After 10 seconds, the two above conditions are still true.

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Chapter 3: Maintenance and Checkout

3.3.4.5 MSpO2 Check

1. Use the Trim Knob Control on the monitor front panel to select MSpO2 on the General screen to access the

MSpO2 Setup screen and congure as follows:

a. For Nellcor Models: Set Response Time to Fast, Print Interval to 2 minutes, and % O2 Trace to On.

b. For Masimo Models: Set Sensitivity to Normal, Averaging to 8, Print Interval to 2 minutes, and % O2

Trace to On

2. Access the Install Options Screen 1 and set the SpO2 Scale to Auto.

3. Set Default Settings to Hospital in Install Options Screen 2 and then select Store Current to Hospital to save the settings. Exit the service mode by selecting Restart at the bottom of the screen.

4. Attach an SpO2 sensor to your nger and connect it to the monitor and allow the monitor a few seconds to obtain a steady reading.

5. Select Pulse/MECG to enter MHR/P Setup screen and change MHR/P Source to MSpO2 and HR/PR Trace to On and then exit back to General screen.

6. Use Trim Knob Control to set the waveform softkey (on the bottom of General screen) to MSpO2.

7. Turn on the recorder and allow data to collect for at least ve minutes and conrm that:

a. The correct waveform appears on the display.

b. The MSpO2 shows a value on the display.

c. The MSpO2 pulse amplitude indicator shows a uctuating bar graph.

d. The MHR/P display mode shows Pulse.

e. The MHR/P displays a value.

f. The MHR/P trend plots in the top grid with the above value.

g. The MSpO2 scale grid marks stamp on the paper.

h. The message MSpO2% is printed in the annotation line on the strip chart paper.

i. A diamond symbol ◊ (with MSpO2 and MHR/P vital signs) is printed in the annotation area on the strip

chart paper at 2-minute intervals.

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Chapter 3: Maintenance and Checkout

3.3.4.6 MECG Input Check

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

1. Make sure the monitor unit and the PS320 simulator are both turned o.

2. Connect a Y adapter cable (GE Part number: 1442AAO) to the monitor and then connect the 3-Lead MECG

cable (orderable through GE part number: 2025177-055) to the MECG connector of the Y adapter and the left panel terminals of the PS320 simulator as per below connection diagram:

3-Lead ECG Cable Terminal Name PS320 Simulator - Left Panel Terminal

Left Arm (LA) shall be connected to Fet/Mat

Left Leg (LL) shall be connected to Maternal

Right Arm (RA) shall be connected to Reference

3. Turn on the PS320 simulator and the monitor.

4. Use the PS320 simulator front panel to set the Maternal ECG parameters, MAT.(Rate) to 60 BPM and

Amplitude to 0.5mV.

NOTE: For PS320 simulator setup information, see Appendix D .

5. Verify that the monitor display shows a value of 60 BPM and conrm that:

a. The MHR/P mode shows MECG.

b. The MHR heartbeat indicator ( ♥ ) ashes at a rate of 60 times per minute (1 per second).

6. Change the MAT. rate to 80 BPM on the PS320 simulator. Conrm the following on the monitor display and

the recorder:

a. The MHR Value shows 80 ± 1.

b. The MHR heartbeat indicator ( ♥ ) ashes at a rate of 80 times per minute.

c. The ECG “beep” volume is generated from the rear panel speaker.

d. The volume can be adjusted on the MHR/P Setup screen.

e. The recorder prints a continuous line at 80 BPM on the top grid of the strip chart paper. (Set HR/PR

Trace to On in the MHR/P Setup screen.)

7. Repeat step 6 for each of the following rates: 100, 120, 140 and 160 BPM.

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Chapter 3: Maintenance and Checkout

3.3.4.7 FECG Input Check

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

1. Make sure the monitor unit and the PS320 simulator are both turned o.

2. Connect a Y adapter cable (GE Part number: 1442AAO) to the monitor and then connect the 3-Lead FECG

cable (orderable through GE part number: 2025177-055) to the FECG connector of the Y adapter and the left panel terminals of the PS320 simulator as per below connection diagram:

3-Lead ECG Cable Terminal Name PS320 Simulator - Left Panel Terminal

Left Leg (LL) shall be connected to Fet/Mat

Right Arm (RA) shall be connected to Fetal

Left Arm (LA) shall be connected to Reference

3. Turn on the PS320 simulator and the monitor unit.

4. Use the PS320 simulator front panel to set the Fetal ECG parameters, Fetal(Rate) to 60 BPM and Amplitude to 0.5mV.

NOTE: For PS320 simulator setup information, see Appendix D .

5. Look at the monitor display until the monitor displays a value of 60 BPM and conrm that:

a. The MHR/P mode shows MECG.

b. The MHR heartbeat indicator ( ♥ ) ashes at a rate of 60 times per minute (1 per second).

6. Change the Fetal rate to 80BPM in the PS320 simulator. Conrm the following on the monitor display and the recorder:

a. The MHR Value shows 80 ± 1.

b. The MHR heartbeat indicator ( ♥ ) ashes at a rate of 80 times per minute.

c. The ECG “beep” volume is generated from the rear panel speaker. The volume can be adjusted on the

MHR/P Setup screen.

d. The recorder prints a continuous line at 80 BPM on the top grid of the strip chart paper. (Set HR/PR

Trace to On in the MHR/P Setup screen.)

7. Repeat step 6 for each of the following rates: 100, 120, 140 and 160 BPM.

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Chapter 3: Maintenance and Checkout

3.3.4.8 Ultrasound Input Check

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

1. Make sure the monitor and the PS320 simulator are both turned o.

2. Connect a GE-approved ultrasound transducer to the US input connector of the monitor and connect the

Fluke® mechanical fetal heart (MFH-1) to the US1 port of the PS320 simulator.

3. Place the ultrasound transducer face up on a at surface and coat the face with an appropriate ultrasound

conductive gel.

4. Turn on the PS320 simulator and the monitor unit.

5. Place the simulation window of the mechanical fetal heart over the ultrasound transducer and then use the

PS320 simulator front panel to set the ultrasound (Fetal Heart Rate) parameters Fetal (Rate) to 120 BPM and

Amplitude to 50µV.

NOTE: For PS320 simulator setup information, see Appendix D .

6. Make sure the monitor recorder is on. Depress the Record Button on the monitor front panel to turn the recorder on if necessary.

7. Conrm the following on the monitor display and the recorder:

a. The FHR1 mode shows US.

b. The FHR1 value shows 120 ± 1.

c. The FHR1 heartbeat indicator ( ♥ ) ashes at a rate of 120 times per minute.

d. The ultrasound audio is generated from the rear panel speaker and the volume can be adjusted using

the Volume (Increase/Decrease) Buttons.

e. The recorder prints a continuous line at 120 BPM on the top grid of the strip chart paper.

f. The recorder prints US on the center margin of the strip chart paper after approximately 20 seconds.

8. Increase the US value from 120 BPM baseline to 150 BPM in the PS320 simulator. Conrm the following on the monitor display and the recorder:

a. The FHR1 value immediately shows 150 ± 1.

b. The recorder prints a continuous line at 150 BPM on the top grid of the strip chart paper.

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Chapter 3: Maintenance and Checkout

9. Decrease the US value from 120 BPM baseline to 90 BPM in the PS320 simulator. Conrm the following on

the monitor display and the recorder:

a. The FHR1 value immediately shows 90 ± 1.

b. The recorder prints at the last input rate for an additional 3 seconds before blanking the heart rate data

and printing a continuous line at 90 BPM on the top grid of the strip chart paper

10. Set the US value to each of the following rates in PS320 simulator: 60, 90, 120, 150, 180, and 210 BPM and conrm that:

a. The FHR1 value reects the rate set in the PS320 simulator with a tolerance of ± 1 BPM .

b. The FHR1 heartbeat indicator ( ♥ ) ashes at the rate set in the PS320 simulator.

c. The ultrasound audio is generated from the rear panel speaker.

d. The recorder prints a continuous line at the set value ± 3 BPM on the top grid of the strip chart paper.

11. Turn the monitor and the PS320 simulator o. Disconnect the ultrasound transducer from the monitor and

connect it to the second US connector (US2) on the monitor unit and then turn the monitor unit and PS320 simulator on. Repeat steps 6 to 9 using the second ultrasound channel (The mode will show US2).

12. Disconnect the ultrasound transducer from the monitor unit. Conrm the following on the monitor display and the recorder:

a. The FHR1 value is blank and the mode shows INOP.

b. The recorder stops printing the fetal heart rate trace.

c. The recorder prints CARDIO INOP on the center margin of the strip chart paper after approximately 20

seconds.

3.3.4.9 Uterine Activity Input Check

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

1. Make sure the monitor and the PS320 simulator are both turned o.

2. Connect the TOCO cable (Fluke® Part number: 2462519) to the UA input connector of monitor unit and the

TOCO connector of the PS320 simulator.

3. Turn on the PS320 simulator and the monitor unit.

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Chapter 3: Maintenance and Checkout

4. Use the Trim Knob Control of the monitor to go to Service Mode and access the Install Options Screen 2 and

set Pressure units to mmHg.

5. Take a note of the Default TOCO Reference value.

NOTE: The monitor is shipped from the factory with the Default TOCO Reference value set at 10 mmHg (1.3

kPa). However, your monitor may have been custom congured.

6. Exit the Service Mode by selecting Restart at the bottom of the screen.

7. Make sure the monitor recorder is on. Depress the Record Button on the monitor front panel to turn the

recorder on if necessary.

8. Briey press the UA Reference Button on the monitor. Conrm the following on the monitor display and the

recorder:

a. The UA mode shows TOCO.

b. The UA value reects the value of Default TOCO Reference.

c. The recorder prints a continuous line at the default value on the uterine activity channel of the strip

chart paper.

d. The recorder prints UA REF on the strip chart paper.

9. Press and hold the UA Reference Button on the monitor to cycle through the available selections for UA

reference: 5,10, 15, 20, or 25 relative units in mmHg mode. Conrm that the correct UA value is displayed

on the monitor and that the recorder prints a continuous line at the corresponding value on the uterine

activity channel of the strip chart paper.

10. Set the TOCO amplitude to 5μV and TOCO Level at each of the level settings: 0, 20, 40, 60, 80 and 100 relative units in the PS320 simulator. Conrm that the correct UA value is displayed on the monitor and that the recorder prints a continuous line at the corresponding value on the heart rate channel of the strip chart

paper.

NOTE: For PS320 simulator setup information, see Appendix D.

11. Disconnect the TOCO cable from the monitor and simulator. Connect the IUP cable (Fluke® Part Number:

2462469) from TOCO connector in PS320 Simulator to the UA connector of the monitor.

12. Set the TOCO Level to 0 mmHg/kPa. Depress the UA Reference Button on the monitor. Conrm on the monitor and recorder display that:

a. The UA value shows 0.

b. The UA mode shows IUP.

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Chapter 3: Maintenance and Checkout

c. The recorder prints a continuous line at 0 mmHg on the uterine activity channel of the strip chart paper.

d. The recorder prints UA REF on the strip chart paper.

13. Set the simulator TOCO amplitude to 5μV and TOCO Level at each of the level settings: 0, 20, 40, 60, 80 and

100 mmHg. Look at the monitor display/recorder and conrm that the UA value is displayed accordingly and that the recorder prints a continuous line at the corresponding value on the uterine activity channel of

the strip chart paper.

14. Disconnect the IUP cable from the UA input connector on the front panel of the monitor. Conrm the

following on the monitor display and the recorder:

a. The UA value is blank and the mode shows INOP.

b. The recorder stops printing the uterine activity trace.

c. The recorder prints UA INOP on the center margin of the strip chart paper after approximately 20

seconds.

3.3.5 Pattern Memory Check

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

1. Make sure the monitor and the PS320 simulator are both turned o.

2. Connect the FECG and TOCO cables (orderable through GE part number: 2025177-055 and Fluke® Part

number: 2462519) to the corresponding connectors of the monitor and the PS320 simulator (See Appendix D).

3. Turn on the PS320 simulator and the monitor unit.

4. Use the PS320 simulator front panel to select FETAL PATTERNS by repeatedly pressing MAIN Button.

5. Select TREND 1 from the Menu by pressing the SUB Button on the PS320 simulator and press ENTER after selecting the TREND 1 pattern. The simulator starts to change the fetal heart rate and uterine activity values up and down.

NOTE: For PS320 simulator setup information, see Appendix D .

6. Make sure the monitor recorder is on. Depress the Record Button on the monitor unit front panel to turn the recorder on if necessary.

7. Conrm that the monitor recorder prints out a value equal to that displayed on the monitor for FHR and UA parameters.

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Chapter 3: Maintenance and Checkout

3.3.5.1 Dual Heart Rate Check (FECG/US Modes)

NOTE: The instructions in this procedure are based on the use of Fluke® PS320 simulator. Refer to Appendix G

for CorometricsTM 325 simulator use instructions.

NOTE: Two PS320 simulators are required to perform this check. One PS320 simulator is used for providing

FECG signal and the other one is used for providing the ultrasound signal.

1. Make sure the monitor and the PS320 simulators are both turned o.

2. Connect a Y adapter cable (GE Part number: 1442AAO) to the monitor and then connect the 3-Lead FECG

cable (orderable through GE part number: 2025177-055) to the FECG connector of the Y adapter and the left panel terminals of the PS320 simulator as per below connection diagram:

3-Lead ECG Cable Terminal Name PS320 Simulator - Left Panel Terminal

Left Leg (LL) shall be connected to Fet/Mat

Right Arm (RA) shall be connected to Fetal

Left Arm (LA) shall be connected to Reference

3. Connect a GE-approved ultrasound transducer to the US input connector of the monitor and connect the

Fluke® mechanical fetal heart (MFH-1) to the US1 port of the second PS320 simulator.

4. Turn on the two PS320 simulators and the monitor.

5. Use the rst PS320 simulator front panel to set the Fetal ECG parameters Fetal (Rate) to 120 BPM and

Amplitude to 50µV.

NOTE: For PS320 simulator setup information, see Appendix D .

6. Place the simulation window of the mechanical fetal heart connected to second PS320 over the ultrasound transducer and then use the PS320 simulator front panel to set the ultrasound (US1 Port) parameters Fetal (Rate) to 150 BPM and Amplitude to 50µV.

7. Make sure the monitor recorder is on. Depress the Record Button on the monitor front panel to turn the recorder on if necessary.

8. Conrm the following on the monitor display and the recorder:

a. The FHR1 mode shows FECG.

b. The FHR1 value shows 120 ± 1.

c. The FHR1 heartbeat indicator ( ♥ ) ashes at a rate of 120 times per minute.

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Chapter 3: Maintenance and Checkout

d. The FHR2 heartbeat indicator ( ♥ ) ashes at a rate of 150 times per minute.

e. The FHR2 mode shows US.

f. The recorder prints the messages FECG and US on the center margin of the strip chart paper.

g. The recorder prints a continuous plain black line on the 120 BPM mark on the heart rate channel of the

strip chart paper.

h. The recorder prints a bold black ramp trace on the 150 BPM mark on the heart rate channel of the strip

chart paper.

3.3.5.2 Dual Heart Rate Check (Dual Ultrasound Modes)

NOTE: Two ultrasound transducers are required to generate fetal heart rate signals to perform this check.

NOTE: This check can also be performed using two PS320 simulators. Do not perform this check using one

PS320 simulator and one ultrasound transducer.

1. Make sure the monitor unit is turned o.

2. Connect one ultrasound transducer to the US input connector and the other ultrasound transducer to the

US2 input connector of the monitor unit.

3. Turn on the monitor unit.

4. Make sure the monitor recorder is on. Depress the Record Button on the monitor unit front panel to turn the

recorder on if necessary.

5. Conrm the following on the monitor display and the recorder:

a. The FHR1 mode shows US.

b. The FHR2 mode shows US2.

c. The FHR1 value shows three steady dashes “– – –.”

d. The FHR2 value shows three steady dashes “– – –.”

e. The recorder prints US and US2 on the center margin of the strip chart paper.

6. Hold the ultrasound transducer connected to US input in your hand with the transducer front facing

the palm of your hand and use your other hand to gently press and depress the back of the transducer rhythmically while maintaining a steady rate. Conrm the following:

a. The FHR1 value responds to the rubbing.

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Chapter 3: Maintenance and Checkout

b. The FHR1 heartbeat indicator ( ♥ ) responds to the input.

c. The recorder prints the heart rate tracing corresponding to the rate and the trace is plain black.

7. Hold the ultrasound transducer connected to US2 input in your hand with the transducer front facing

the palm of your hand and use your other hand to gently press and depress the back of the transducer rhythmically while maintaining a steady rate. Conrm the following:

a. The FHR2 value responds to the rubbing.

b. The FHR2 heartbeat indicator ( ♥ ) responds to the input.

c. The recorder prints the heart rate tracing corresponding to the rate and the trace is bold black.

3.3.6 NIBP Calibration Check

This procedure provides instruction to verify the accuracy of the NIBP circuitry, perform calibration if necessary, and check the NIBP pneumatic circuit plumbing for leaks. Refer to section 4.4.1 for detailed information.

3.3.7 Electrical Safety Tests

This section provides instructions to check if potential electrical health hazards to the patient or the operator of

the monitor unit exist.

Use an electrical safety analyzer and follow the operating instructions supplied by the manufacturer of the safety analyzer to set up and perform the electrical safety tests.

NOTE: For reliable leakage current checks, perform the Ground Resistance Check rst.

3.3.7.1 Power Outlet Check

This procedure checks the condition of the power outlet (wall outlet) from which the monitor gets power to ensure correct results from leakage tests. Use a multimeter to ensure the power outlet is wired properly. If other than normal polarity and ground is indicated, corrective action must be taken before proceeding. The results of the following tests will be meaningless unless a properly wired power outlet is used.

3.3.7.2 Ground Resistance Check

Perform this check on the monitor unit only, with no other equipment (peripherals) attached.

1. Connect the monitor power cord to the safety analyzer.

2. Verify that the AC power cord of the safety analyzer is plugged into an appropriate wall outlet.

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Chapter 3: Maintenance and Checkout

3. Turn on the safety analyzer and set it to measure the ground resistance.

4. Measure the resistance between the ground (earth) terminal of the Power Inlet Module and the

Equipotential Lug on the rear side of the monitor unit. The resistances shall be 100mΩ or less.

3.3.7.3 Ground (Earth) Leakage Current and Enclosure Leakage Current Checks

Perform this check on the monitor unit only, with no other equipment (peripherals) attached.

1. Connect the monitor power cord to the safety analyzer.

2. Verify that the AC power cord of the safety analyzer is plugged into an appropriate wall outlet.

3. Turn on the safety analyzer and set it to measure the ground leakage current.

4. Turn on the monitor unit.

5. In normal conditions and in all possible operating modes, the ground leakage current shall be 300 μA or

less.

6. If required by local ordinances, in single-fault conditions and in all possible operating modes, the ground

leakage current shall be 500 μA or less.

7. Set the safety analyzer to measure the enclosure (chassis) leakage current (Use the Equipotential Lug in the rear side of the monitor for the chassis connection of the safety analyzer).

8. In normal conditions and in all possible operating modes, the enclosure leakage current shall be 100 μA or less.

9. If required by local ordinances, in single-fault conditions and in all possible operating modes, the enclosure

leakage current shall be 300 μA or less.

3.3.7.4 Patient-to-Ground (Patient Source) and Patient-to-Line (Patient Sink) Leakage Current Checks

Perform this check on the monitor unit only, with no other equipment (peripherals) attached. Table 3-1 lists the maximum allowable patient (source/sink) leakage currents for dierent applied parts.

1. Connect an ECG test body (e.g. ECG cable with all its leads shorted together) to the ECG input of the monitor.

2. Connect the monitor power cord to the safety analyzer.

3. Verify that the AC power cord of the safety analyzer is plugged into an appropriate wall outlet.

4. Attach the External clamp of the safety analyzer to the test body.

5. Turn on the safety analyzer and congure it to measure the patient (source/sink) leakage currents.

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Chapter 3: Maintenance and Checkout

6. Turn on the monitor unit.

7. In normal conditions and in all possible operating modes, the patient leakage currents shall be 10 μA or less.

8. If required by local ordinances, in single-fault conditions and in all possible operating modes, the patient

(source/sink) leakage currents shall be 50 μA or less.

9. Disconnect the ECG test body from the monitor. Connect an US test body (e.g. Ultrasound transducer wrapped in aluminum foil) to the US input of the monitor and repeat steps 2 to 5. The patient (source/sink) leakage currents shall be 100 μA or less in normal conditions (all possible operating modes) and 500 μA or less in single-fault conditions (all possible operating modes).

10. Disconnect the US test body from the US input and connect it to the US2 input of the monitor and repeat steps 2 to 5. The patient (source/sink) leakage currents shall be 100 μA or less in normal conditions (all possible operating modes) and 500 μA or less in single-fault conditions (all possible operating modes).

11. Disconnect the US test body from the US2 input. Connect an SpO2 test body (e.g. SpO2 sensor wrapped in aluminum foil) to the MSpO2 input of the monitor and repeat steps 2 to 5. The patient leakage currents shall be 100 μA or less in normal conditions and 500 μA or less in single-fault conditions.

12. Disconnect the SpO2 test body from the monitor. Connect an IUP or TOCO test body (e.g. IUP or TOCO transducer wrapped in aluminum foil) to the UA input of the monitor and repeat steps 2 to 5. The patient leakage currents shall be 100 μA or less in normal conditions and 500 μA or less in single-fault conditions.

Table 3-3: Maximum allowable patient leakage currents for applied parts of Coro250cx series monitor

Applied Part

FECG CF 10 50 MECG Deb-CF 10 50 US1, US2 BF 100 500

SpO

UA BF 100 500

NIBP Deb-BF 100 500 Temperature BF 100 500

Fetal Acoustic Stimulator

Part Type

(per IEC 60601-1)

BF 100 500

Maximum Allowable Leakage Current (a.c.) (µA)

Normal condition Single-fault condition

Page 73

Chapter 4: Calibration

This chapter includes calibration procedures required for CorometricsTM 250cx series monitor repair, or maintenance. These procedures must be performed by authorized service personnel.

Each CorometricsTM 250cx Series monitor is calibrated in the factory prior to shipment to the customer and so

no calibration is required upon the installation of the monitor unit.

4.1 Calibration Schedule

Table 4-1 lists the calibration procedures, species when and how often each procedure should be performed, and provides the approximate time that it takes to perform each procedure.

For good care and maintenance of the CorometricsTM 250cx series product, perform calibration procedures at specic time intervals.

Table 4-1: Calibration Procedures Schedule

Procedure Name Approximate Time

NIBP Calibration Check 8 minutes Annually As needed* Recorder Photosensors Check 5 minutes As needed As needed**

Recorder Calibration (osets) Check 2 minutes Annually As needed**

*NIBP calibration check shall be performed after repair or replacement procedures related to NIBP subsystem of the monitor. ** Recorder photosensors check and calibration (osets) check shall be performed after repair or replacement procedures related to

recorder assembly of the monitor.

WARNING:

Do not service the CorometricsTM 250cx series unit while it is in clinical use.

CAUTION:

Table 4-1 shows the minimum frequencies required for maintenance. Always follow hospital and local regulations for required frequencies.

To Be Performed as

Planned Maintenance

To Be Performed as Checkout after any service

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Chapter 4: Calibration

4.2 Environmental Requirements

The system shall be installed, serviced, and operated within the environmental conditions described in section

A.1.

4.3 Tool Requirements

The following table lists the service tools required to perform the calibration procedures:

Table 4-2: Tool Requirements for Calibration Procedures

Procedure Name Service Tools Needed (QTY)

Adult Cu (1), 3” rigid Cylinder (1), Standard 12-foot NIBP hose (1),

NIBP Calibration Check

Recorder Photosensors Check Multimeter (1) Recorder Calibration (osets) Check Standard service tools

External Manometer (1), capable of reading to 350mmHg (46.7 kPa), Hand Pump Bulb (1)

NOTE: Do not use a DNI CuLink to perform the calibration procedures.

4.4 Calibration Procedures

4.4.1 NIBP Calibration Check

This section provides instruction to verify the accuracy of the NIBP circuitry, perform calibration if necessary, and check the NIBP pneumatic circuit plumbing for leaks. Any NIBP calibration check procedure consists of a sequence of sub-procedures:

a. Calibration Verication

b. Transducer Calibration

c. Overpressure Detection

d. System Leakage

The sequence starts with Calibration Verication. If Calibration Verication shows that the NIBP transducers are out of calibration then Transducer Calibration shall be performed. Perform Overpressure Detection and System Leakage only after NIBP transducers have been shown to be in calibration.

To set up the system and tools for calibration procedures (See Figure 4-1):

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Chapter 4: Calibration

1. Wrap an adult cu around a 3” rigid cylinder.

2. Connect a standard 12-foot NIBP hose between the cu and the monitor.

3. If hand ination is needed, connect a hand pump bulb between the cu and the NIBP hose.

4. Access the NIBP Calibration screen by navigating to Install Screen Options 1 in the service mode and then

selecting Tests softkey. Select NIBP Cal in the Diagnostics Control screen.

NOTE: The external manometer must read pressure in the same scale (mmHg or kPa) as the monitor. Settings

can be changed on the monitor Pressure Units to match the unit setting on the manometer.

Figure 4-1 NIBP Calibration Check Setup

4.4.1.1 Calibration Verication

1. Use the Trim Knob Control to set Mode to Verify in the NIBP Calibration screen. The monitor will inate the cu to approximately 200 mmHg.

2. Conrm that the PT1 and PT2 pressure values shown on the monitor display are within the “pass” range of external manometer reading ± 2 mmHg (0.3 kPa) . If the pressure values are not within the “pass” range, perform the Transducer Calibration sub-procedure.

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Chapter 4: Calibration

NOTE: To stop Calibration Verication select Done, which appears after the Verify softkey has been pressed.

The monitor will vent pressure to atmosphere and re-zero the transducers.

4.4.1.2 Transducer Calibration

1. Use the Trim Knob Control to set Mode to Calibrate in the NIBP Calibration screen. The monitor will inate the cu to approximately 200 mmHg.

2. Once the pressure has stabilized, use the Trim Knob Control to enter the pressure from the external manometer in the External eld.

NOTE: Best accuracy is achieved if the system is given a short time to settle. Best accuracy is achieved if the

system pressure is at or near 200 mmHg (26.7 kPa). The monitor will vent pressure to atmosphere and re-zero the transducers after Trim Knob Control is pressed to enter the pressure value in the External eld.

3. Perform Calibration Verication and then repeat steps 1-3 if Calibration Verication fails.

4. Commit the new calibration factors by selecting Store Calibration in the NIBP Calibration screen.

NOTE: Between entering the external pressure and committing the new calibration factors the Exit menu item

will display as Exit – No Store to indicate current calibration factors will be lost if Service Mode is exited prior to selecting Store Calibration.

NOTE: The menu item Store Calibration will only display after Calibration Verication has been performed

during the Calibration procedure.

4.4.1.3 Overpressure Detection

1. Use the Trim Knob Control to set Mode to OVP Test in the NIBP Calibration screen. The monitor will close the valves.

2. Use the hand pump bulb to inate the system until the monitor detects an overpressure condition. When

approaching the overpressure trip point, inate the system slowly.

NOTE: Upon detection of an overpressure condition, the monitor will vent pressure to the atmosphere and

re-zero the transducers. The monitor displays the maximum detected pressure near the bottom of the

NIBP Calibration screen.

3. If the overpressure condition occurs when the external manometer reading is outside of 300 - 330 mmHg

(40.0 - 44.0 kPa) range, perform Calibration Verication and Transducer Calibration. Then repeat steps 1-2. Contact service if the overpressure condition still occurs outside of 300 - 330 mmHg (40.0 - 44.0 kPa) range.

4.4.1.4 System Leakage

1. Use the Trim Knob Control to set Mode to Leak Test in the NIBP Calibration screen.

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Chapter 4: Calibration

NOTE: Make sure you have the 12-foot hose and the cu tightly wrapped around a rigid 3” cylinder. This air

volume is required to properly test the leakage rate.

NOTE: To perform the leakage test, the monitor will inate to approximately 200 mmHg (26.7 kPa), allow 45

second of settling time, then take two pressure readings (30 seconds apart) to calculate the system leakage rate, and eventually vent pressure to the atmosphere. The system leakage rate and PASS or FAIL result will be displayed on the screen.

2. Upon completion of the test, conrm that the monitor displays the leakage rate and PASS near the bottom of the NIBP Calibration screen.

NOTE: System leakage rate shall be no more than 6 mmHg (0.8 kPa) per minute. If the monitor has a leakage

rate more than 6mmHg (0.8 kPa) per minute, inspect the external and internal pneumatic hoses, valves, connectors for loose connection and or leaks.

4.4.2 Recorder Photosensors Check

SENSITIVE TO ELECTROSTATIC DISCHARGE

This procedure includes ESD sensitive parts. ESD control guidelines must be followed during this procedure to ensure that static charges are safely conducted to the ground and not through the sensitive device, to prevent damage to the equipment.

4.4.2.1 Paper-Low Photosensor Adjustment

1. Remove the top cover of the monitor as instructed in section 6.1.

2. Load the recorder with GE-approved strip chart paper. Make sure that there are no black squares showing.

3. Turn on the monitor unit.

4. Press the Record Button on the monitor front panel to turn on the recorder. Allow the paper to advance for

a few seconds in order to tension the paper.

5. Turn o the recorder.

6. Set a multimeter to measure DC voltage and connect its positive lead to Pin 4 of J9 and the negative lead

to Pin 2 of J9 on the recorder board.

7. Conrm that the multimeter reads a DC voltage of +150 ± 2 mVDC. Adjust R31 on the recorder board, if necessary, to set the voltage to be within the acceptable range.

NOTE: If you open and then close the recorder door, the DC voltage reading may vary 5–10 mV due to the loss

of tension in the paper. This is acceptable and you do not need to re-adjust.

8. Open the recorder door and verify that the reading on the multimeter is greater than +4.75 VDC.

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Chapter 4: Calibration

9. To create a paper-low condition, re-load the paper so that black squares show on the surface (i.e., the last

several sheets of a pack).

10. Turn on the recorder.

11. The value on the multimeter shall go up and down as the paper surface alternates between black and

white. Verify that the maximum value is greater than or equal to 2.0 VDC.

12. Turn o the recorder.

4.4.2.2 Paper-Out Photosensor Adjustment

1. Remove the top cover of the monitor as instructed in section 6.1.

2. Load the recorder with GE-approved strip chart paper. Make sure that there are no black squares showing.

3. Turn on the monitor unit.

4. Press the Record Button on the monitor front panel to turn on the recorder. Allow the paper to advance for

a few seconds in order to tension the paper.

5. Turn o the recorder.

6. Set a multimeter to measure DC voltage and connect its positive lead to Pin 3 of J9 and the negative lead

to Pin 2 of J9 on the recorder board.

7. Conrm that the multimeter reads a DC voltage of +150 ± 2 mVDC. Adjust R29 on the recorder board, if

necessary, to set the voltage to be within the acceptable range.

NOTE: If you open and then close the recorder door, the reading may vary 5–10 mV due to the loss of tension

in the paper. This is acceptable and you do not need to re-adjust.

8. Open the recorder door and verify that the reading on the multimeter is greater than +4.75 VDC.

4.4.2.3 Paper-Load Photosensor Adjustment

1. Remove the top cover of the monitor as instructed in section 6.1.

2. Load the recorder with GE-approved strip chart paper. Make sure that there are no black squares showing

and the recorder is loaded with at least nine sheets of strip chart paper.

3. Turn on the monitor unit.

4. Set a multimeter to measure DC voltage and connect its positive lead to Pin 6 of J9 and the negative lead

to Pin 2 of J9 on the recorder board.

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Chapter 4: Calibration

5. Conrm that the multimeter reads a DC voltage of 190 ± 5 mVDC. Adjust R41 on the recorder board, if necessary, to set the voltage to be within the acceptable range.

4.4.3 Recorder Calibration (osets) Check

1. Load the monitor recorder with GE-approved strip chart paper.

2. Turn the monitor on.

3. Use the Trim Knob Control to access the Diagnostic Control screen and set the Recorder Calibration into On

and press the Trim Knob Control to select it. Run the test for at least 10 seconds.

4. Conrm that the rst horizontal trace is printed 0.49” ± 0.002” from the right hand edge of the paper. If the trace does not fall within the specied oset range, perform the recorder vertical oset adjustment as

instructed in section 5.11.1.

5. Conrm the recorder paper does not curls to one side and the vertical lines are printed with equal weight

from one end to the other with no dots missing along the vertical trace. If not, perform the recorder horizontal oset adjustment as instructed in section 5.11.2.

Figure 4-2 Horizontal and Vertical Traces on Strip Chart Paper

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Chapter 4: Calibration

Page 81

Chapter 5: Diagnostics and Troubleshooting

This chapter lists some of the major symptoms of CorometricsTM 250cx Series monitors as well as the possible causes and solutions. For any necessary part replacements or adjustments, follow the instructions provided in See Chapter 6. Always read all the warnings, cautions, notes, and other information provided in the “Important Safety Information” section before starting any troubleshooting.

NOTE: For each symptom, the possible causes are listed in a certain sequence to provide a quick and eective

troubleshooting guide. Therefore, investigate the possible causes of each symptom in order from top to bottom to nd the root cause of the symptom.

NOTE: The ID column in troubleshooting tables is only created for the purpose of simplifying symptoms

referencing throughout the manual.

5.1 General Troubleshooting Table

General Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Conrm that the power

cord is plugged into the power outlet and securely connected to the monitor unit.

Conrm that power is

available at the power outlet.

Disconnect the power cord from the unit and outlet and inspect for any

damages. Replace the

power cord if necessary.

Remove the top cover

and check if the fuse is open. If yes, replace the

power supply.

S1.1

Power cord is not properly connected to the monitor unit or the power outlet.

No power at the outlet.

No monitoring functions and Power Indicator

does not illuminate when the monitor unit is

turned on (Power Switch is placed in the On (I) position).

Power cord is defective.

Fuses are open (defective)

or missing.

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Chapter 5: Diagnostics and Troubleshooting

General Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Access the General Setup screen to set the time and date.

Replace the timekeeping RAM chip (See section

6.1).

Replace the main board.

S1.2 The monitor shows incorrect date and time.

Date and time are set

incorrectly.

The timekeeping RAM chip (U30) on the main board is defective.

The main board is defective.

Press the Volume buttons

Audio volume is set too low.

or access the respective

setup screen(s) (FECG, US, or US2) to increase the

volume.

S1.3

The monitor does not generate any

heartbeats or pulse sounds.

The transducer is not

connected or is loosely connected.

Inadequate ultrasound

gel is used.

Ensure that the transducer is securely attached to monitor and applied to the patient.

Apply adequate

ultrasound gel. Make sure GE-approved

The recorder is o or out of paper.

paper is installed in the recorder. Press the Record button.

Perform the recorder

photosensors check

(See section 4.4.2). Conrm the paper-out

photosensor cable is connected properly to the recorder and the recorder board. Replace

the photosensor if the

symptom persists (See

S1.4

When the monitor is turned on, the recorder does not function and the Record Indicator is o.

Paper-out photosensor is

out of calibration.

Paper-out photosensor

(on the left hand side of the recorder)

is disconnected or

defective.

section 6.20).

When the monitor is turned on, the recorder

S1.5

does not function and the Record Indicator is o and the message PAPER INCORRECTLY

LOADED, RELOAD WITH BLACK SQUARES

Paper is loaded backwards in the recorder.

Re-install the paper in the recorder.

DOWN is shown in maternal waveform area.

Page 83

Chapter 5: Diagnostics and Troubleshooting

General Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

S1.6

When the monitor is turned on, the recorder functions but the Record Indicator ashes on and o every second.

Paper supply in recorder is low or paper incorrectly loaded.

Paper-low photosensor is

out of calibration.

Paper-low photosensor (on the right hand

side of the recorder)

is disconnected or

defective.

Install a new pack of

GE-approved paper in the recorder.

Perform the recorder

photosensors check

(See section 4.4.2). Conrm the paper-low

photosensor cable is connected properly to the recorder and the recorder board. Replace

the photosensor if the

symptom persists (See

section 6.20). Check if the recorder

stepper motor does stepping. Replace

the stepper motor if

necessary. Replace the recorder

assembly.

Replace the main board.

S1.7

S1.8

S1.9

When the monitor is turned on, the recorder does not function and the Record Indicator is

on.

When the monitor is turned on, SYSTEM FAULT:ROM error message appears on the

display.

When the monitor is turned on, SYSTEM FAULT:RAM error message appears on the

display.

The recorder stepper motor is defective.

Recorder roller is

defective.

The main board ash memory is defective.

The main board SRAM memory is defective.

Restart the monitor and

check the CPU software version of the monitor.

S1.10

When the monitor is turned on, SYSTEM FAULT:ALERT error message appears on the

display.

Software error

Upgrade software if

necessary (See Appendix

F). If the software is up-

to-date and the symptom still exists, replace the main board.

S1.11

When the monitor is turned on, SYSTEM FAULT:UI KEYPAD error message appears on

Communication problem exists between the main

board and the UI keypad

board.

Make sure the interconnect cable is securely connected.

the display.

UI keypad board is defective.

Replaced the UI keypad

board.

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Chapter 5: Diagnostics and Troubleshooting

General Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

SW1 switch #7 is

incorrectly set.

Disable SW1 switch #7.

Restart the monitor and

check the CPU software

S1.12

When the monitor is turned on, SYSTEM FAULT:SOFTWARE error message appears on

the display.

Software error

version of the monitor. Upgrade software if

necessary (See Appendix

F). If the software is up-

to-date and the symptom still exists, replace the main board.

When the monitor is turned on, SYSTEM

S1.13

FAULT:DEFAULTS error message appears on

Main board is defective. Replace the main board.

the display.

When the monitor is turned on, SYSTEM

S1.14

FAULT:DSP error message appears on the

DSP board is defective. Replace the DSP board.

display.

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Chapter 5: Diagnostics and Troubleshooting

5.2 Ultrasound Troubleshooting Table

Ultrasound Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Conrm that the

transducer is securely connected to the monitor unit.

Reposition the transducer

and wait for a few seconds before moving

the transducer. Check the ultrasound gel

applied to the transducer

and apply more if

necessary. Check the ultrasound

transducer functionality

as per instructions in section 3.3.3.1. Replace

the transducer if

necessary.

Use an alternate

technique to capture FHR.

The monitor does not show the fetal heart rate

S2.1

properly on the display when the ultrasound transducer is connected to the monitor.

Ultrasound transducer is not properly connected to the monitor unit.

Ultrasound transducer is not properly positioned on the patient.

Too little ultrasound gel is

applied to the ultrasound transducer.

The ultrasound transducer is defective.

Ultrasound signal cannot

be captured due to one of the following conditions: a) Active fetus or mother b) Fetal arrhythmia or

hiccups

c) Extreme maternal

obesity

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Chapter 5: Diagnostics and Troubleshooting

Ultrasound Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Use GE-approved

Inappropriate ultrasound

transducer used.

ultrasound transducers.

Do not use refurbished

transducers.

Keep sheets and gown o

Environmental noise

transducer. Do not hold

transducer with hand. Reposition the transducer

and wait for a few seconds before moving

S2.2 Static noise exist on the ultrasound signal

Active fetus

the transducer. Check ultrasound

transducer functionality The ultrasound transducer is defective.

as per instructions in

section 3.3.3.1. Replace

the transducer if

necessary.

Use an alternate

technique to capture FHR.

Access Install Options

Screen 1 screen and

set the paper scaling to

match the type of paper

used.

The FHR Rate shown on the display and the

S2.3

FHR trend on the strip chart paper do not correlate.

Maternal movement

The paper scale is incorrectly congured to

either 50-210 bpm or 30240 bpm.

Use the Volume Buttons

The tone volume is set

low.

on the monitor to

increase the volume of

the ultrasound tone.

S2.4 The volume of the ultrasound tone is low.

The dual ultrasound board is out of

calibration.

Contact service for

calibrating the dual

ultrasound board

OR order a new dual

ultrasound board and

replace it.

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Chapter 5: Diagnostics and Troubleshooting

5.3 FECG Troubleshooting Table

FECG Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Internal FECG parameter is shown erratically

S3.1

or not being recorded properly.

The FHR Rate shown on the display and the

S3.2

FHR trend on strip chart paper do not correlate.

FECG cable is not properly connected to the monitor unit.

Attachment pad or leg plate is not securely attached to the patient.

Electrode wire is not secure in the leg plate post.

Electrode is defective or

not properly attached. Attachment pad is

defective.

Paper Scale is incorrectly

congured to either 50-

210 bpm or 30-240 bpm.

Conrm that the cable

is securely connected to the monitor unit.

Conrm the pad or the

leg plate is securely attached to the patient.

Conrm the leg plate

connection in the leg plate post is secure.

Check the electrode and

replace it if necessary.

Check the pad and

replace it if necessary.

Access Install Options Screen 1 screen and

set the paper scaling to

match the type of paper

used.

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Chapter 5: Diagnostics and Troubleshooting

5.4 External Uterine Activity Troubleshooting Table

External Uterine Activity Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Conrm that the

transducer is securely

connected to the monitor

unit.

Reposition the transducer

and conrm it is securely

applied to the patient.

Loosen belts or remove

transducer from patient.

Press UA Reference

button while no pressure

is applied to transducer

button. Re-apply

transducer. Do not over-

tighten the belt. Press UA

Reference button again

between contractions.

Securely apply the TOCO

transducer to the patient

and wait for maternal

contractions.

Check the TOCO

transducer functionality

as per instructions in

section 3.3.3.2. Replace

the transducer if

necessary.

Press the UA Reference

button between the

contractions.

The TOCO transducer is not recording the

S4.1

contractions.

Flashing “+” sign appears in the UA eld on the

S4.2

screen.

TOCO transducer is not

properly connected to the monitor unit.

TOCO transducer is not

properly positioned on the patient.

UA reference range

exceeded.

No maternal contractions exist.

The TOCO transducer is defective.

Relative pressure is more than 100.

The UA board is defective. Replace the UA board.

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Chapter 5: Diagnostics and Troubleshooting

External Uterine Activity Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Make sure to wait ten

UA Reference button is pressed before the UA circuitry is stabilized.

seconds following

powering on the monitor and/or connecting the transducer to the UA connector.

Loosen the belt or

remove the transducer

from patient. Press UA Reference button while

CHECK TOCO message is shown in UA area of

S4.3

the display when the UA

Reference button is pressed.

UA reference range

exceeded because the belt is over-tightened.

no pressure is applied to the transducer button.

Re-apply transducer. Do

not over-tighten belt.

Press UA Reference

button again between the contractions.

Check the TOCO

transducer functionality The TOCO transducer is defective.

as per instructions in

section 3.3.3.2 Replace

the transducer if

necessary. UA board is defective. Replace the UA board.

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Chapter 5: Diagnostics and Troubleshooting

5.5 Internal Uterine Activity Troubleshooting Table

Internal Uterine Activity Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Conrm that the

transducer is securely connected to the monitor unit.

Flush the dome and the catheter.

Inspect the dome for damages and replace it if

necessary.

Inspect the catheter and replace it if necessary.

Calibrate catheter or strain gauge.

Flush the catheter and

Re-zero. Replace the catheter if necessary.

Reposition by twisting the catheter.

Check the catheter

functionality. Replace the transducer if necessary.

Internal pressure parameter is not being

S5.1

measured correctly.

CHECK IUP message is shown in UA area of the

S5.2

display.

The transducer is not

properly connected to the monitor unit.

Air bubble exists in the dome or the catheter is blocked.

Dome is cracked.

Catheter has fallen out of

place. Catheter or strain gauge

is not zeroed. UA board is defective. Replace the UA board.

Blockage exists in uidlled catheter.

Fetus is pressing directly on the catheter.

The catheter is defective.

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Chapter 5: Diagnostics and Troubleshooting

5.6 MECG Troubleshooting Table

MECG Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

MECG parameter is shown erratically or not

S6.1

being properly recorded.

Dashes (– – –) are shown in MHR/P area of the

S6.2

display.

The cable is not properly

connected to the monitor unit.

Electrode gel is dried.

Electrodes are not properly placed.

Clips are not attached to electrodes properly.

Selected lead is providing

inadequate signal. The MECG cable is

defective. MECG board is defective. Replace the MECG board.

Monitor is unable to make a determine MECG due to

insucient signal.

Conrm that the cable

is securely connected to

the monitor unit.

Check electrodes and re-

apply gel if necessary.

Re-apply electrodes.

Check clip attachments.

Change lead selection on

MHR/P Setup screen.

Inspect the cable and

replace it if necessary.

Conrm that the patient

is not asystolic and the

electrodes are rmly

secured to the patient. MECG board is defective. Replace the MECG board.

5.7 Blood Pressure Troubleshooting Table

Blood Pressure Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Annotate chart, then take

a manual reading in-

S7.1 High reading

Measurement is taken during uterine contraction.

between contractions. If

possible, cancel reading

during contraction.

Enable the monitor’s

Smart BP feature.

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Chapter 5: Diagnostics and Troubleshooting

Blood Pressure Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Improper cu position or loose cu.

Reposition the cu and conrm that the cu is

properly tightened. Restrict patient limb

Maternal movement

movement. Restrain limb

if necessary.

CHECK CUFF message is shown in NIBP area of

S7.2

the display.

Hose is not properly connected to monitor (air

pressure error).

Neonatal cu is used for

the measurement.

Make sure that hose is

rmly attached to the

monitor.

Conrm that an adult cu is used for the

measurement.

NIBP board is defective. Replace the NIBP board.

Restrict patient limb

OVERPRESSURE message is shown in NIBP area

S7.3

of the display.

Cu pressure has

exceeded the

over-pressure limit of 315 mmHg ± 15 mmHg.

The hose is kinked.

movement. If the

symptom still exists,

the NIBP hose or the NIBP board is defective.

Contact service.

Check the external cu for kinks.

The hose is blocked. Perform pneumatic test.

COMM message is shown in NIBP area of the

S7.4

display.

MOTION message is shown in NIBP area of the

S7.5

display.

Communication error exists between the built-

in NIBP module and the

monitor circuitry.

Excessive maternal movement.

The NIBP board or the main board is defective.

Contact service.

Restrict patient limb movement. Restrain limb

if necessary. Reposition cu. Ensure

the patient is not arrhythmia and move

cu to another limb. If

the symptom still exists,

Dashes (– – –) are shown in NIBP area of the

S7.6

display.

Monitor is unable to determine the blood pressure.

contact service.

Replace the NIBP

pneumatic board.

The NIBP board or the main board is defective.

Contact service.

REPAIR message is shown in NIBP area of the

S7.7

display.

NIBP Pump is defective.

System error or self-test failure.

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Chapter 5: Diagnostics and Troubleshooting

Blood Pressure Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Monitor is unable to

WEAK SIGNAL message is shown on the

S7.8

display.

determine the blood pressure due to

Assess patient situation.

insucient signal.

5.8 Maternal Pulse Oximetry Troubleshooting Table

Maternal Pulse Oximetry Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

COMM message is shown in MSpO2 area of the

S8.1

display.

Dashes (---) are shown in MSpO2 area of the

S8.2

display.

MHR/P Pulse source is blank when MSpO

S8.3

is selected

Communication error exists between the built-

in MSpO2 module and the monitor circuitry.

The sensor is improperly applied on the patient’s nger.

Maternal movement.

Excessive ambient light exists.

Monitor is unable to determine the pulse oximetry due to

insucient signal.

The wrong SpO2 sensor is

connected to the monitor.

The sensor is defective.

The SpO2 module + carrier board is defective.

Normal mode is selected.

The SpO2 module + carrier

board or the main board

is defective. Contact

service.

Ensure the sensor is

not too tight. Move

the sensor to another

location.

Restrict patient limb

movement. Restrain limb

if necessary.

Cover the sensor with

opaque material.

Conrm that the

intermediate cable is

rmly attached to the

monitor and to the sensor

assembly.

Use the same SpO2

sensor type (Nellcor,

Masimo) that the monitor

supports.

Inspect the sensor and

replace it if necessary.

Replace the SpO2 module

+ carrier board.

Select Fast mode on

MSpO2 Setup screen.

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Chapter 5: Diagnostics and Troubleshooting

Maternal Pulse Oximetry Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Verify the settings of SW1 switch on the main board are correct. If the

REPAIR message is shown in MSpO2 area of the

S8.4

display. (Nellcor only)

System error or self-test failure.

symptom still exists, the SpO2 module + carrier board or the main board

is defective. Contact

service.

The monitor does not show any MSpO2 value

S8.5

and SENSOR message appears below the MSpO2 area of the display.

The wrong SpO2 sensor is

connected to the monitor.

Use the same SpO2 sensor type (Nellcor,

Masimo) that the monitor

supports

5.9 Main Board Troubleshooting – Voltage Checks

SENSITIVE TO ELECTROSTATIC DISCHARGE

1. Make sure the monitor is turned o.

2. Remove the top cover as instructed in section 6.1

3. Turn the monitor on.

4. Use a multimeter to measure and verify the below power supply voltages on J14 connector pins of the

main board. Use pin 8 of J14 as the ground (GND) for the voltage measurements.

J14 Pin Number Signal Name Acceptable Voltage Range

1 +12EL +12 VDC ±0.5 VDC 2 +20I +20 VDC ± 0.5 VDC 3 +15BP +15 VDC ± 0.5 VDC 4 -15V -15 VDC ± 0.5 VDC 5 +15V +15 VDC ± 0.5 VDC 6 +12A +12 VDC ± 0.5 VDC 7 +5V +5 VDC ± 0.5 VDC 8 GND -9 No Connection --

10 Keying --

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Chapter 5: Diagnostics and Troubleshooting

5.10 FECG/UA Board Troubleshooting – Voltage Adjustments

SENSITIVE TO ELECTROSTATIC DISCHARGE

1. Make sure the monitor is turned o.

2. Remove the top cover as instructed in section 6.1.

3. Remove the cage cover.

4. Turn the monitor on.

5. Set a multimeter to measure DC voltage. Connect the positive lead of the multimeter to TP1 and the

negative lead to TP2 or TP3 (isolated ground) on the FECG/UA board.

6. Conrm that the multimeter reads a DC voltage of +4.0V ± 0.01V. Adjust R28 if necessary.

5.11 Recorder Troubleshooting

5.11.1 Vertical Oset Adjustment

SENSITIVE TO ELECTROSTATIC DISCHARGE

Follow below instructions to perform vertical oset adjustment if the recorder prints the horizontal traces with oset, i.e. upon running the self-test routine or recorder calibration test, the rst horizontal trace is outside the acceptable range. The acceptable range is 0.49” ± 0.002” from the right hand edge of the paper.

1. Remove the top cover as instructed in section 6.1.

2. Turn on the unit and use the Trim Knob Control to go to Install Options Screen 1 and access Diagnostic

Control screen.

3. Use a small hex key to loosen the two set screws on both sides of the recorder assembly (See Figure 5-1).

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Chapter 5: Diagnostics and Troubleshooting

4. Use a hex key to adjust the one hex-head screw (See Figure 5-2) on the right side of the recorder assembly (the one lower hex-head screw on the side where stepper motor is attached)

5. Set the Recorder Calibration in the Diagnostic Control screen to On and press the Trim Knob Control to select it. Run the test for at least 10 seconds and check if the rst horizontal trace falls within the specied

acceptable range.

6. Set the Recorder Calibration to O and press the Trim Knob Control to select it. Go back to step 4 to do

further adjustment if the rst horizontal trace falls outside the specied acceptable range.

7. Turn o the monitor.

8. Tighten the two set screws on both sides of the recorder assembly (See Figure 5-1).

9. Re-install the top cover.

Figure 5-1 Figure 5-2

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Chapter 5: Diagnostics and Troubleshooting

5.11.2 Horizontal Oset Adjustment

SENSITIVE TO ELECTROSTATIC DISCHARGE

Use the Trim Knob Control to go to Install Options Screen 1 and access Diagnostic Control screen to run the recorder calibration test. Follow below instructions to perform the horizontal oset adjustment if any of the following symptoms are detected:

• The recorder paper consistently curls to one side.

• Printing of unequal weight occurs along the vertical trace line, from one end to the other.

• Dots are missing along the vertical trace.

• Printing is too light following the recorder thermal print head replacement.

NOTE: If skewing occurs, check for other malfunctions. Noticeable skewing of a vertical line printed on the strip

chart paper is usually accompanied by one of the above-mentioned symptoms.

1. Remove the top cover as instructed in section 6.1.

2. Use a hex key to loosen the four hex-head lock screws, two on each side of the recorder assembly (See

Figure 5-3).

3. To move the recorder thermal print head forward on one side for horizontal adjustment, use long nose pliers to back-o the corresponding captive screw (turn counterclockwise) from its alignment block (See Figure 5-4). To move the recorder thermal print head backward on one side for horizontal adjustment, use long nose pliers to tighten the corresponding captive screw (turn clockwise).

4. After making the necessary adjustments, use a hex key to tighten the four hex-head lock screws (See Figure 5-3).

5. Re-install the top cover.

Figure 5-3 Figure 5-4

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Chapter 5: Diagnostics and Troubleshooting

5.11.3 Light Printing

SENSITIVE TO ELECTROSTATIC DISCHARGE

If the monitor recorder (intermittently) prints too lightly such that the prints on fetal chart paper are barely legible, follow the troubleshooting owchart (Figure 5-5) and the table to x the issue. Load the monitor

recorder with the GE-approved chart paper. Close the recorder door and allow 1-2 pages to roll out by pressing the Paper Advance button. Set the display to service mode and then press test button to get a test print.

NOTE: Don’t touch the thermal print head heating element with bare hand.

NOTE: Paper should be installed in the monitor’s strip chart recorder at all times. This reduces particle build-up

on TPH and facilitates opening the recorder door.

NOTE: Do not rotate the recorder roller without having chart paper.

Page 99

Chapter 5: Diagnostics and Troubleshooting

Figure 5-5 Recorder Light Printing Symptom - Troubleshooting Flowchart

Page 100

Chapter 5: Diagnostics and Troubleshooting

Recorder Light Printing Troubleshooting Table

ID Symptom Description Possible Causes Actions and Solutions

Inappropriate fetal chart

paper is used.

Use GE-Recommended fetal chart paper only (Part numbers: 2009828-CAO, 2009828-DAO, 2009828-FAO).

Use cotton swabs and methanol or isopropyl alcohol to clean the thermal print head (See

section 3.3.2). Care must be taken not to touch the heater elements while cleaning. Check for missing segments on chart paper after cleaning.

Paper residue, dust or other material is built up on thermal print head

(TPH).

S11.1

The monitor recorder (intermittently) prints

too lightly such that

the prints on fetal

chart paper are barely readable.

Thermal print head

pressure is uneven because the springs are not seated properly.

Recorder door assembly is broken or loose. Press and hold the recorder door toward

the monitor. If printing

darkens on either side,

check if recorder door

assembly is broken or loose causing the roller

alignment to be out of

adjustment (recorder door heat staking joint

loose or broken).

Ensure all four springs are held captive between TPH support and the recorder frame.

Replace the recorder assembly.