HP 783xx, 788xx Service manual 1

HP 783Xx Series and HP 788Xx Series

Service Manual’- Volume 1

Patient Monitors and Neonatal Monitors

HEWLETT

Ea

HP Part No. 78354-90008

Printed in Germany

PACKARD

Edition 8

March 1993

Notice

The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but

not limited to, the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Hewlett-Packard assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Hewlett- Packard.

This document contains proprietary information, which is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language without the prior written consent of Hewlett-Packard Company. The information contained in this document is subject to change without notice.

Hewlett-Packard Company Medical Products Group (Europe)

Schickardstrasse 4

7030 Boeblingen

Federal Republic

of Germany

Printing History

New editions are complete revisions of the manual. Update packages, which are issued between editions, contain additional and replacement pages to be merged into the manual by the customer. The dates on the title page change only when a new edition or a new update is published.

Preface

This manual covers the following models: w MODELS 78352A/78352C/78353A/78353B/78354A/78354C PATIENT MONITORS w MODELS 78832A/78833A/78833B/78834A/78834C NEONATAL MONITORS w MODEL 78356A GAS MONITOR The contents of this manual (Volume One) apply to HP Models 78352A/C, 78353A, 78353B,

78354A and 78354C series, 78832A, 78833A, 78833B, 78834A/C series, and 78356A with the

following serial numbers prefixed:

MODELS

78352A 78352C 78353A 78353B 78354A 78354C 78356A

PREFIX

2640G First Issue 2348G 2612G 2613G First Issue 2717G

MODEL

78832A 78833A 78833B 78834A 78834C

PREFIX

2412G 2413G 2610G 2611G First Issue

Instruments with higher serial numbers may contain production changes. In such cases refer to the Manual Change sheets and Publication Change Notices enclosed with this manual.

Hewlett-Packard reserves the right to make changes in its products without notice in order to improve design or performance characteristics. Hewlett-Packard products are sold on the basis of the specifications valid on the day of purchase. Hewlett-Packard is not obliged to update instruments which have already been retailed.

. . . III

CONTENTS OVERVIEW

This manual contains service information for the Hewlett-Packard 78352/3/4, 78832/3/4 and

78356A monitors. The information is divided into two sections:

n

Chapter 1 - Theory of Operation

n

Chapter 2 - Maintenance Checks

q

Chapter 2a - Performance Assurance Checks

q

Chapter 2b - Specification Checks

q

Chapter 2c - Technical Specifications for all Monitors

Further sections covering disassembly and reassembly of the monitor, switch programming and adjustments, schematic diagrams and replaceable parts lists, are contained in Volume 2 of the

manual (part number 78354-90010).

Documentation relating to these monitors:

Instrument Document Part Number

Note

78352A 78353B/4A 78352C/4C 78352A/2C/3B/4A/4C 78833B/4A 78834C 78833B/4A/4C 78356A 78356A

783528 ) 78362C 3 monitors are 783638 ) referred to 783538 ) in text es 783548 3 783Xx Series 78354C

3

Operating Guide Operating Guide Operating Guide Installation Guide Operating Guide Operating Guide Installation Guide Operating Guide Installation Guide

end 788328 3 monitors are

78833A 1 referred to 708338 3 in text as 788348 3 788Xx Series 78334C

78352-90001 78354-90001 78354-92001 78354-90011 78834-91001 78834-92001 78834-90011 78356-90001 78356-90011

3

iv

Special Notation

Notes, cautions, and/or warnings may accompany the defined below:

Note

I

VI!

Caution

Warning

Notes provide emphasis to information or additional inforniation “off line”

from a procedure.

Cautions highlight procedures that must be followed to avoid damage to the

recorder.

Warnings highlight procedures that must be followed to avoid hazards to human life or safety.

instructions in this manual. They are

Contents

1. Theory Of Operation Introduction

Functional description

Shared Memory and Data Transfer

General Power Fail Time Slices

Mother Board 78353-66501 and 78354-66501

Video Amplifier Horizontal Deflection Circuit Vertical Deflection Circuit High Voltage Circuits Power-On Reset 5 V Buffering.

Extender Board

Display UP Boards 78353-66502 (16K byte), 78354-66502 (40K byte)

78354-66602 and 78354-66702 (48K byte) Character Generation Slow/fast Sync. Signal Generation Clock Generation 2 ms Interrupt Signal Generation Alarm Trigger Generation Power Fail Circuit Display Software

Single Channel Interpolation Board 78352-66503

D-A Convertor and Sample and Hold Circuits

Shuffle Mux ............................

Video Pulse Generator Ramp Generator Raster Line Control

Erase Bar Latch Wave Length Latch

Start-up Delay Three-Channel Interpolation Board 78353-66503 Power Supply Board 78351-66506

+5 V DC Supply

f12 V DC Supplies

t17V DC Supply

Audio Board 78353-66512 Battery Board 78832-66519

Battery Charge Circuit

Alarm Lamp Drive Circuit

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1-1 1-1 1-2 1-2 1-2 1-2 1-5 1-5 1-5 1-5 1-6 1-6 1-6 1-6

1-8 1-8 1-9 1-9 1-9

1-9 1-10 1-10 1-13 1-13 1-13 1-13 1-14 1-14 1-14 1-14 1-14 1-16 1-18 1-18 1-18 1-18 1-19 1-21 1-21 1-21

Contents-1

ECG Board (Full Lead) 78354-66522(42) and 78354-66722(42)

Floating Input Circuit

Right-Leg Drive INOP Detection Circuit Lead Selector Circuit

Grounded Input Circuit Digital Circuits

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ECG Parameter Software

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ECG Board (3 Lead) 78832-66522 (50 Hz) and 78832-66542 (60 Hz)

Floating Input Circuit Right-Leg Drive INOP Detection Circuit Lead Selector Circuit

Grounded Input Circuit

Digital Circuits

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ECG Parameter Software

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Pressure Board 78353-66532 (Single Channel) and 78353-66534 (Dual Channel)

Transducer Excitation Circuits Transducer Signal Demodulation Circuits Analog to Digital Conversion Transducer Disconnected Detection

Zero, Calibration and Test Functions Digital Circuits

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Pressure Parameter Software

Non-Invasive Blood Pressure (NIBP) Board 78352-66535

General Principle of Operation

NIBP Parameter Board 78352-66535

Pressure Transducer

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Amplification and Filtering Analog to Digital Conversion Digital Circuit

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Safety and Valve/Pump Control NIBP Parameter Software

Non-Invasive Blood Pressure (NIBP) Board 78352-66358

Specifications

Patient Modes

Measurement Principle

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General Principle of Operation NIBP Parameter Board 78352-66538 The Analog Board-Hardware Description

Pressure Transducers and Input Amplifier Oscillation Channel

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Multiplexer and A/D Conversion EEPROM and Latch

Hardware Description

Valve Drivers Pump Motor

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The Digital Board-Hardware Description

Partial CO2 Pressure Board 78354-66540 and 78356-66540

General Principle of Operation CO2 Parameter Board 78354-66540 and 78356-66540

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1-22 1-22

1-22 1-22 1-22 1-23 1-23 1-24 1-26 1-26 1-26 1-26 1-27 1-27 1-28 1-28 1-30 1-30 1-30 1-30 1-31 1-31 1-31 1-32 1-35 1-35 1-37 1-37 1-37 1-37 1-37 1-38 1-38 1-41 1-41 1-41 1-42 1-43 1-44 1-44 1-44 1-44 1-44 1-45 1-45 1-45 1-45 1-46 1-49 1-49 1-50

Contents-2

Motor Circuit Temperature Control Circuit Preamplifier Analog to Digital Conversion Digital Circuits

Oxygen Board 78354-66541 and 78356-66541

General Principle of Operation

Preamplifier Circuit

Temp/Pleth/Aux Board 78353-66552 and 78354-66552

Pleth Floating Input Circuit Test Function Generator INOP Detection Circuit Pleth Sensor Circuit Temperature Floating Input Circuit Temperature Grounded Circuit Aux Input Circuit Digital Circuits Temp/Pleth/Aux Parameter Software

Temperature Board 78832-66552 and 78834-66552

Input Circuits Signal Rectification and A/D Conversion Digital Circuits Temperature Parameter Software

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Dual Temperature Board 78353-66554 and 78354-66554

Input Circuits Signal Rectification and A/D Conversion Digital Circuits Temperature Parameter Software

Respiration Board 78832-66562

Input Circuits INOP Detection Respiration Wave Signal Circuits Feedback Loop Operation A/D Conversion

A. Initial conditions B. Patient impedence increases to 1.5 kohm + 10 C. Summing point again at zero volts

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Test Signals ............................

Digital Circuits Respiration Parameter Software

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Transcutaneous Partial CO2 and O2 Board 78834-66572

Transducer Recognition tcpCO2 Input

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tcpO2 Input ............................

Polarization Voltage Heater Circuit Temperature Control Analog Multiplexer

Analog to Pulse Width Conversion Repolarization Floating Power Supply

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1-50 1-50 1-53 1-53 1-53 1-54 1-54 1-54 1-57 1-57 1-57 1-57 1-57 1-57 1-57 1-58 1-58 1-58 1-60 1-60 1-60 1-60 1-60 1-63 1-63 1-63 1-63 1-63 1-67 1-67 1-67 1-67 1-67 1-68 1-68 1-68 1-68 1-69 1-69 1-69 1-73 1-73 1-73 1-73 1-73 1-74 1-74 1-74 1-75 1-76 1-76

Contents-3

Digital Circuits

Clock ..............................

Watchdog Circuit EAROM Barometer Board Information

Parameter Software

Barometer Board 78834-66573

Circuit Operation

Oxygen Saturation/Pleth (SPO2) Board 78354-66510/520

Floating Section

ESU Rejection ..........................

Ambient Light Rejection Amplification

Compensation for Ambient Light ..................

The Transducer ..........................

Multiplexer ...........................

LEDs ..............................

Selftest .............................

Grounded Section

780 System Interface (Non-Annotating) 78353-66590

Input Circuits Beat-to-beat Heart Rate Average Heart Rate System Control Signals

Status byte ...........................

ECG Wave. Respiration Wave

780 Interface Board (Annotating) 78353-66592

Digital Circuits

Analog Circuits

System Board Software

SDN Board 78353-66595

Microprocessor Interface Circuit and I/O RAM System Interface Controller (SIC) Data Synchronization Circuit Control Logic Signature RAM

RS-232C Interface Board 78354-66598 ..................

General Principle of Operation ROM/RAM Counter-timer Circuit

Serial Interface ...........................

Watchdog Circuit

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1-76 1-76 1-77 1-77 1-77 1-78 1-80 1-80 1-83 1-83 1-84 1-84 1-84 1-84 1-85 1-85 1-85 1-85 1-86 1-89 1-89 1-89 1-89 1-90 1-90 1-90 1-90 1-92 1-92 1-92 1-92 1-97 1-97 1-97 1-97 1-98 1-98

1-100 1-100 1-100 1-101 1-101 1-101

Contents-4

2. Maintenance Checks

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2a. Performance Assurance Checks

Introduction

General ..............................

Test equipment General checks Monitor Service Test Mode Display Intensity Checks in ECG Setup Mode

Filter/Diagnostic Mode Check

Parameter Set-up Keys

Pressure Channel Check and Calibration

CO2 and O2 Calibration and Adjustments Temperature Channel Checks Plethysmograph Channel Checks Barometer Board Checks

tcpCO2/tcpO2 Channel Checks and Transducer

HP 15210A Calibration Unit

Installation Description Unpacking the Instrument

Initial Inspection Claims For Damage

Repacking for Shipment or Storage Instrument Identification Specification Operating Environment Operating Information Fitting the Gas Cylinders Storage of Gas Cylinders Disposal of Used Gas Cylinders

Routine Maintenance

Changing the Gas Cylinders Care and Cleaning

Theory of Operation Gas Flow Performance Checks

Test Procedure Disassembly Parts List Transducer Troubleshooting

SpO2 Channel Checks

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2-1

2a-1 2a-1 2a-2 2a-2 2a-2 2a-4 2a-4 2a-5 2a-6 2a-7

2a-9 2a-10 2a-11 2a-11 2a-11 2a-15 2a-15 2a- 15 2a-15 2a-15 2a-15 2a-16 2a-16 2a-16 2a-17 2a-17 2a-17

2a-17 2a-17 2a-18 2a-18 2a-18 2a-19 2a-20 2a-20 2a-22 2a-25 2a-26 2a-30

Contents-5

2b. Specification Checks Introduction

Specification Checks Test Equipment ECG Channel Pressure Channel

Transformer Test Settings for Pressure Output Linearity

Plethysmograph channel

Respiration Channel NIBP Calibration and Adjustments

NIBP Calibration and Adjustments (HP7xxxC Only)

RS 232C Interface Checks Barometer Board Adjustment TcpCO2 /tcpO2 Channel SpO2 Board

2c. Technical Specifications for all Monitors

Introduction Technical Specifications 78352A/C

General ..............................

Patient safety Power requirements: Environment:

Display

Superaster video display:

ECG Channel (Full lead)

ECG Amplifier Patient Safety:

Cardiotach Digital cardiotach

Analog output

ECG wave on phone-jack. Alarms Test/Calibration ST Segment Monitoring (78354-66722)

Noninvasive Blood Pressure (NIBP)

General Modes

Alarms .............................

Temperature Channel

Trend.. .............................

General .............................

ECG Channel

Pressure Channel

Dual Temperature Channel System Interface

System outputs SpO2 /Pleth

Alarms

Pleth Amplifier

Cardiotach Graticule lines

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2b-1 2b-1 2b-1

2b-9 2b-11 2b-12 2b-12 2b-14 2b-17 2b-18 2b-20 2b-21 2b-21

2c-1 2c-1 2c-1 2c-1 2c- 1

2c-1 2c-2 2c-2

2c-2 2c-2

2c-2

2c-3

2c-4 2c-4 2c-5 2c-5 2c-5 2c-6 2c-6 2c-6 2c-6 2c-6

2c-6 2c-6 2c-7 2c-7 2c-7 2c-7 2c-8

Contents-6

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Test

Technical Specifications 78353A

General

Patient safety: Power requirements:

Environmental: Display ECG Channel (3 lead)

ECG Amplifier

Cardiotach ............................

Analog Output Alarms Test

Plethysmograph Channel

Pleth. amplifier

Cardiotach. ............................

Graticule lines Test

Alarms .............................

Pressure Channel

Pressure amplifier Auto zero

Pressure wave display

Alarms .............................

Calibration/test signal

Rear panel output

Temperature Channel

Auxiliary Input Channel

General .............................

Auxiliary input -

Graticule line labelling and resolution Auxiliary input - 47210 Capnometer

System 780 Annotating Interface

General .............................

ECG System Outputs

Pressure system outputs Plethysmograph system outputs

Temperature system output

System 780 Non-Annotating Interface

ECG Wave. Heart Rate Control Signals Alarm Relay (only loaded on request)

Technical Specifications - 78353B and 78354A/C

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78205D Pressure module

Auxiliary signals and parameters Selectable channels for external recorder

Wave .............................

Wave (All the following voltages are f 50 mV.)

Wave .............................

DC output (HR)

DC output ...........................

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2c-8 2c-9 2c-9 2c-9 2c-9 2c-9

2c-9 2c-10 2c-10 2c-10 2c-10 2c-11 2c-11 2c-11 2c-11 2c-11 2c-12 2c-12 2c-12 2c-12 2c-12 2c-12 2c-13 2c-13 2c-13 2c-13 2c-14 2c-14 2c-14 2c-14 2c-15 2c-15 2c-16 2c-16 2c-16 2c-16 2c-16 2c-16 2c-16 2c-16 2c-17 2c-17 2c-17 2c-17 2c-17 2c-18 2c-18 2c-18 2c-18 2c-18 2c-19

Contents-7

General ..............................

Patient safety ..........................

Power requirements ........................

Enviromental ...........................

Display ..............................

ECG Channel (Full lead)

ECG Amplifier ..........................

Cardiotach

Analog output ..........................

Alarms

Test/Calibration .........................

ST Segment Monitoring (78354-66722)

Plethysmograph Channel

Pleth. amplifier ..........................

Cardiotach

Graticule lines ..........................

Autofix

Test ...............................

Alarms

Pressure Channel

Pressure amplifier .........................

Auto zero

Pressure wave display .......................

Graticule line labelling and resolution: Pulse Rate

Alarms .............................

Test/calibration .........................

Noninvasive Blood Pressure (NIBP)

General

Modes ..............................

Alarms Alarm Limit Adjustments (78354C):

Respiration Channel

Respiration amplifier .......................

Respiration trigger ........................

Alarms .............................

Fractional Inspired Oxygen

Alarms

Carbon Dioxide

General

Instantaneous CO2 Wave Display

End Tidal CO2 Numerical Display Respiration Rate Numerical Display

Alarms .............................

Temperature Channel Auxiliary Input Channel

General .............................

Auxiliary input - 78205D Pressure module

Graticule line labelling and resolution.

Auxiliary input - 47210 Capnometer

SpO2 / Pleth ............................

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2c-19 2c-19 2c-19 2c-19 2c-20 2c-20 2c-20 2c-20 2c-21 2c-21 2c-21 2c-21 2c-22 2c-22 2c-22 2c-23 2c-23 2c-23 2c-23 2c-23 2c-23 2c-23 2c-24 2c-24 2c-24

2c-24 2c-24 2c-25 2c-25

2c-25 2c-25 2c-25 2c-26 2c-26 2c-26 2c-26 2c-26 2c-27 2c-27 2c-27 2c-27 2c-27 2c-28 2c-28 2c-29 2c-29 2c-29 2c-29 2c-29 2c-30 2c-30

Contents-8

Alarms Pleth Amplifier

Cardiotach Graticule lines

Test

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Alarms .............................

System Interface

General (Opt. J11 only) ECG system outputs Pressure system outputs

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Respiration system output

Plethysmograph system outputs

Temperature system output

Trend..

General

ECG Channel

Respiration Channel

Pressure Channel

Pleth Channel

AUX Channel

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Single Temperature Channel Dual Temperature Channel Oxygen Channel Carbon Dioxide Channel SpO2 Channel (78354C)

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Technical Specifications - 78832A

General

Patient safety Power Requirements Environmental

Display

Superaster video display

ECG Channel

ECG Amplifier Patient Safety:

Cardiotach Analog Output Alarms Test/Calibration

Temperature Channel Respiration Channel

Respiration amplifier

Respiration trigger

Respiration alarms

780 Annotating Interface

General

ECG System Outputs

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...................... 2c-36

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Respiration-system output Temperature - system output

Trend..

General

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2c-30

2c-31 2c-31 2c-31 2c-31

2c-31 2c-31 2c-31 2c-32

2c-32

2c-33

2c-33 2c-34 2c-34 2c-34 2c-34 2c-34 2c-35 2c-36

2c-36

2c-37 2c-38 2c-38 2c-38 2c-38 2c-39 2c-39

2c-39 2c-39 2c-39 2c-40 2c-40 2c-40 2c-40

Contents-9

ECG Channel

Respiration Channel ........................

Technical Specifications - 78833A

General

Patient safety ..........................

Power Requirements ........................

Environmental ..........................

Display

Superaster video display ......................

ECG Channel ...........................

ECG Amplifier ..........................

Patient Safety: ..........................

Cardiotach ............................

Analog Output ..........................

Alarms .............................

Test/Calibration .........................

Respiration Channel

Respiration amplifier .......................

Respiration trigger ........................

Respiration alarms ........................

Pressure Channel

Pressure amplifier .........................

Auto zero ............................

Pressure wave display .......................

Pulse rate ............................

Graticule line labelling and resolution: ................

Alarms .............................

Test/calibration .........................

780 Annotating Interface

General .............................

ECG System Outputs .......................

Respiration-system output .....................

Pressure system output (P1 only) ..................

Trend..

General .............................

ECG Channel

Respiration Channel ........................

Pressure Channel .........................

Technical Specifications - 78833B and 78834A/C .............

General

Patient safety

Power requirements ........................

Environmental ..........................

Display

ECG Channel ...........................

ECG Amplifier ..........................

Cardiotach ............................

Analog output Alarms Test/Calibration

Temperature Channel

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2c-40 2c-41 2c-42 2c-42 2c-42 2c-42 2c-42 2c-42 2c-42 2c-43 2c-43 2c-43 2c-43 2c-43 2c-43 2c-44 2c-44 2c-44 2c-44 2c-45 2c-45 2c-45 2c-45 2c-45 2c-45 2c-46 2c-46 2c-46 2c-47 2c-47 2c-47 2c-47 2c-47 2c-48 2c-48 2c-48 2c-48

2c-48 2c-49 2c-49 2c-49

2c-49

2c-50

2c-51

2c-51 2c-51 2c-51 2c-52

Contents-10

Respiration Channel

Respiration amplifier Respiration trigger Respiration alarms

Pressure Channel

Pressure amplifier Auto zero

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Pressure wave display Graticule line labelling and resolution: Pulse Rate Alarms

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Test/calibration

Transcutaneous O2 and CO2 Channel (tcpO2 and tcpCO2) : : : : : : : :

General Transducer Heating

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Alarms .............................

Test Signal:

780 Annotating Interface

General ECG system outputs Respiration system output Temperature system output Pressure system output tcpO2 and tcpCO2 system output Plethysmograph system outputs (78834C) Oxygen system output (78834C) Carbon Dioxide system output (78834C)

Trend..

General ECG Channel Pressure Channel

Respiration Channel Dual Temperature Channel tcpO2 and tcpCO2 Channel

Pleth Channel (78834C)

Oxygen Channel (78834C)

Carbon Dioxide Channel (78834C)

SpO2 Channel (78834C)

SpO2 / Pleth (78834C) Alarms Pleth Amplifier

Cardiotach

Graticule lines

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Autofix .............................

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Test Pulse rate alarm limits

Noninvasive Blood Pressure (NIBP)

General Modes

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Alarms .............................

Alarm Limit Adjustments:

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2c-52 2c-52 2c-52 2c-52 2c-53 2c-53 2c-53 2c-53 2c-53 2c-54 2c-54 2c-54 2c-55 2c-55 2c-55 2c-55 2c-56

2c-56 2c-56 2c-56 2c-56 2c-56 2c-57 2c-57 2c-57 2c-57 2c-57 2c-58 2c-58 2c-58 2c-58

2c-58 2c-58 2c-59 2c-59 2c-59 2c-59 2c-59 2c-60 2c-60 2c-60 2c-60 2c-60 2c-60

2c-61 2c-61 2c-61

2c-61

2c-61 2c-62 2c-62

Contents-11

Fractional Inspired Oxygen (78834C)

Alarms

Carbon Dioxide (78834C) : : : : : : : : : : : : : : :

General Instantaneous CO2 Wave Display End Tidal CO2 Numerical Display Respiration Rate Numerical Display Alarms

Graticule Line Labelling and Resolution:

Technical Specifications - 78356A

General

Patient safety Power requirements

Environment ....................

Display Inspired Oxygen

Carbon Dioxide

General Instantaneous CO2 Wave Display End Tidal and Inspired Minimum CO2 Numerical Display Respiration Rate Numerical Display Alarms

Trend

General ......................

Oxygen Channel Carbon Dioxide Channel

System Interface

General (Opt. J11 only) Instantaneous CO2 End Tidal CO2 Respiration Rate

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2c-62 2c-62

2c-62

2c-62 2c-63 2c-63 2c-63 2c-63

2c-64 2c-65 2c-65

2c-65

2c-66

2c-66 2c-66

2c-67

2c-67 2c-67

2c-68

2c-68 2c-68

2c-68

2c-68 2c-69 2c-69 2c-69

2c-69

A. Ordering Information

Main Sales and Support Offices

United States of America Other International Areas

Contents-12

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A-1 A-1 A-2

Figures

1-1. Allocation of Function Blocks to Time Slices 1-2. Shared Memory System 1-3. Mother Board Block Diagram 1-4. Address/Character Distribution on the screen 1-5. Display Microprocessor Board Block Diagram 1-6. Single Channel Interpolation Board Block Diagram 1-7. Interpolation Board Block Diagram 1-8. Voltage Sensing and Regulation

1-9. Audio Board Block Diagram 1-10. ECG Board Block Diagram (Full Lead) 1-11. ECG Board Block Diagram (3 Lead) 1-12. Pressure Board Block Diagram 1-13. Non-Invasive Blood Pressure Board Block Diagram (78352-66535) 1-14. Non-Invasive Blood Pressure Board Block Diagram (78352-66538) 1-15. 14360A Sensor, Mechanical Diagram 1-16. CO2/02 Board Block Diagram 1-17. Temp/Pleth/Aux Board Block Diagram 1-18. Temperature Board Block Diagram 1-19. Dual Temperature Board Block Diagram 1-20. Feedback Loop Operation - Stage 1 1-21. Feedback Loop Operation - Stage 2 1-22. Feedback Loop Operation - Stage 3 1-23. Respiration Board Block Diagram 1-24. TcpCOz/Oz Board Block Diagram 1-25. Barometer Board Block Diagram 1-26. SpOn Board Block Diagram 1-27. 780 System Board (Non-Annotating) Block Diagram 1-28. 780 System Board (Annotating) Block Diagram 1-29. SDN Board Block Diagram 1-30. RS232C Block Diagram

2a-1. Rigel Safety Tester 2a-2. Display Intensity 2a-3. Position of Photoresistor in A and B monitors 2a-4. Position of Photoresistor Monitor in “C” series monitors 2a-5. Initial Set-up Displays for Pressure, Pleth and Respiration 2a-6. Equipment for Pressure Calibration

2a-7. Mercury Calibration Set-up Display 2a-8. Pressure Display after successful Calibration 2a-9. Resistive Simulator for 0 and 200mmgh

2a-10. Block diagram - Internal Components 2a-11. Gas Flow Performance Check - Test 1 2a-12. Gas Flow Performance Check - Test 2/3

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1-2 1-3 1-7

1-8 1-11 1-15 1-17 1-18 1-19 1-25 1-29 1-33 1-39 1-47 1-51 1-55 1-59 1-61 1-65 1-68 1-68 1-68 1-71 1-79 1-81 1-87 1-91 1-95 1-99

1-102

2a-1 2a-4

2a-4 2a-4 2a-6 2a-7 2a-7

2a-8

2a-8 2a-19 2a-20 2a-21

Contents-13

2a-13. Cover Securing Screws (veiwed from underneath) 2a-14. Control Knob

2a-15. Regulator Control Block Securing Screws 2a-16. Regulator and Valve Control Blocks 2a-17. Tubing and Flow Regulator 2a-18. Replaceable Parts for 15210A

2b-1. ECG Amplifier Gain Frequency Response Test Set-up 2b-2. Trigger Sensitivity Check Set-up 2b-3. ECG Amplifier Noise Test Set-up 2b-4. ECG Noise with 50Hz Component 2b-5. 1 mV Calibration Test Set-up

2b-6. Common Mode Rejection Set-up 2b-7. Notch Filter Test Response Characteristic 2b-8. Equipment for Zero and Range Accuracy Check

2b-9. Plethysmograph Channel Test Circuit 2b-10. Test Circuit for INOP check 2b-11. Test Equipment for Respirotach Range Check

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2a-22 2a-22

2a-23

2a-23 2a-24 2a-25

2b-4 2b-5 2b-6 2b-6 2b-7 2b-8 2b-9

2b-10 2b-12 2b-13 2b-13

Contents-14

Tables

1-1. Test Signals and Results

1-2. System Output Configurations 2b-1. Test Equipment Requirements for Specification Checks 2b-2. mmHg Test

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1-69 1-93

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2b-11

Contents-15

1

Theory Of Operation

Introduction

This section contains an overall functional description of the following monitors:

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78352A,78352C,78353A,78353B,78354A,78354C series of adult monitors

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78832A,78833A,78833B,78834A,78354C series of neonatal monitors

n

78356A gas monitor

Also, more detailed descriptions of the individual sub-assemblies are contained in this section.

Functional description

The measured physiological signals are routed directly to the parameter board, where they are amplified and then A/D converted. The digital information is processed by the parameter board microprocessor. The digital section of the Parameter Board contains the microprocessor, the ROM storing the parameter program and a general purpose memory

(RAM).

The results of the parameter processing are transferred to the shared memory. Here they are accessed by the display microprocessor for further processing. The shared memory, which is located on the Display UP Board, is used to store all parameter and waveform information. This information is used by the display microprocessor to update the wave RAM and the numerics RAM.

The wave information is routed from the display microprocessor through a D/A converter to the Interpolation Board. At the same time, alphanumeric information from the numerics RAM (character generator) is parallel-serial converted. The video driver on the Mother Board combines these two signals to drive the CRT. The CRT controller on the Display UP Board triggers the driver circuits on the Mother Board.

Data entered via the keyboard (e.g. alarm limits, lead configuration) is passed via the display microprocessor and stored in the shared memory, where it is accessed by the parameter board for appropriate action. When the parameter board reports back that the action has been carried out, the data is passed to the Display Board microprocessor, which initiates the appropriate display.

Theory Of Operation l-l

Shared Memory and Data Transfer

General

Data transfer in the 783Xx series, the 788Xx series and the 78356A is carried out via a common memory area, to which all function blocks have access. This common memory is the Shared Memory chip U40 on A2 Display UP board. The local bus systems are separated from the main shared memory bus by tri-state buffers.

Power Fail

In the event of power fail the configuration of the instrument at the time of power fail is held

in the shared memory for 15 seconds.

Time Slices

In order to prevent collisions in the main bus, each function block is assigned a defined 2 ms

time slice within the 20 ms CRT frame period. In this time slice it has sole right of access to the shared memory.

/_ 20,ms

LINE COUNTER START

Figure l-l. Allocation of Function Blocks to Time Slices

1-2 Theory Of Operation

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Figure 1-2. Shared Memory System

Theory Of Operation 1-3

. . . . . . . .

. . .

1-4 Theory Of Operation

Mother Board 78353-66501 and 78354-66501

The Mother Board contains the video circuits for the display and the interconnections between the boards which are slotted into the respective connectors on the board.

The main functions of the Mother Board are listed below:

1. Interconnection of boards slotted into the mother board

2. Video amplifier

3. Horizontal deflection circuits (slow sweep driver)

4. Vertical deflection circuits (fast sweep driver)

5. High-voltage circuits

6. Power-on reset

7. 5-V buffering

The monitor display is a raster scanned CRT. It utilizes magnetic deflection and is refreshed at a rate of 50 Hz. The CRT displays 720 vertical lines and operates at a vertical sweep frequency of 40 kHz. The Display UP Board supplies the horizontal sync signal (SLOW

SYNC), the vertical sync signal (FAST SYNC)

Board.

Video Amplifier

Four waveform video inputs (4/4, 3/4, 2/4, l/4) and two numerics inputs (VIDEO NUM, VIDEO NUM INVERSE)

and the numerics signals are applied to the CRT alternately. The positive 70 V supply for the video amplifier is taken from the high voltage circuits. It is fed directly to the cathode voltage regulator circuit, which also contains the black level adjust capability.

are applied to the video amplifier circuits (U2, U3). The waveform

and the video drive signals to the Mother

The basic trace intensity is dependent on the signal from the front-panel photo resistor and the setting of the brightness potentiometer (R24 on the Audio Board).

Horizontal Deflection Circuit

The slow horizontal sweep driver circuit generates a ramp (amplitude) which drives the horizontal deflection yoke. This circuit is contained in integrated circuit U5.

The oscillator in U5 is synchronized by a positive-going pulse at pin 2 (SLOW SYNC signal). Synchronization is inhibited during flyback time. The oscillator frequency is set with potentiometer R21. The linearity can be adjusted with potentiometer R22. A + 17 V supply is applied to Pin 8. Pin 9 provides the output to the deflection coil.

Vertical Deflection Circuit

The fast vertical sweep driver circuit utilizes the FAST SYNC signal from the Display UP Board (A2) to develop a ramp (amplitude) which drives the vertical deflection yoke and in turn deflects the cathode ray from the bottom of the screen to the top (18 us) and then quickly back to the bottom (7 us). L2 is used to adjust the picture height and L3 the linearity.

Theory Of Operation l-5

High Voltage Circuits

The flyback transformer Tl is used to generate the high voltages required by the CRT and the video amplifier.

The five supplies are:

1. A positive voltage of 10 kV for electron acceleration. This is the anode voltage.

2. A positive 100, V supply for grid G2 of the CRT.

3. A positive 300 V supply for grid G4 of the CRT (focus).

4. A supply of virtual 0 V for grid Gl of the CRT.

5. A positive 70 V supply for the video amplifier. Control of the focus and black level is obtained by dividing the supply down with resistor

chains. Both of these chains have potentiometers in them so that adjustments can be made. (R38 for focus and R55 for black level).

Power-On Reset

A power-on reset signal is generated from the + 5 V supply via UlOA, B and associated components. It is used to reset all CPUs in the instrument.

5 V Buffering

The power-on reset signal and +5 V are applied to transistors Qll and &lo, respectively, to

generate the buffered + 5 V for use on the Display UP Board (A2) This is used in the event of

power fail to save stored data for approximately 15 s. Extender Board

The extender board (78354-66504) instrument is connected to the mother board with ribbon cables, and supports additional parameters.

in the full modules 78354A/C and 78834A/C, the

1-6 Theory Of Operation

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Figure 1-3. Mother Board Block Diagram

Theory Of Operation 1-7

Display UP Boards 78353066502 (16K byte), 78354-66502 (40K byte) 78354-66602 and 78354966702 (48K byte)

The Display UP Board is the heart of the instrument. It contains the following functions:

1. Shared memory

2. Character generation (numerics)

3. Slow/fast sync. signal generation

4. Clock generation

5. 20 ms and 2 ms interrupt signal generation

6. Alarm trigger generation

7. Power fail circuit

8. Keyboard handling

The shared memory and data transfer are already described in “Shared Memory and Data Transfer”.

Character Generation

The screen has a capacity of 30 small characters or 15 large characters in horizontal direction and 18 small characters or 9 large characters in vertical direction (4 small characters can be

joined together to make 1 large character). The screen is thus divided up into a maximim of

540 small characters. Each character position is definedby a specific address. The hexadecimal addresses begin at the bottom left of the screen with address OOOH, progress up to the top left

(address 012H) and finish at the top right of the screen with address 21BH.

Address 012H

30

15 large

Address 21BH

small

Address OOOH

Figure 1-4. Address/Character Distribution on the screen

With each address from the CRT controller U20, the numerics RAM U16 passes information on the character to be displayed to latch U18 (6-bit ASCII data information code for character definition, plus one bit to define whether large or small character and one bit to define whether inverse or not).

The lo-bit data is passed to the character generator U12: the 6-bit character information, the 3 bits from the column counter and the inverse bit. The data from the character generator is

then latched into the parallel-serial shift register Ull for output to the video circuits on the Mother Board.

1-8 Theory Of Operation

The sweep is delayed by two clock signals so that it does not start until the character information has reached the parallel-serial shift register Ull; i.e. with one clock pulse, address

1 data is latched into the parallel-serial register, address 2 data is latched into U18 and address 3 data presented to the numerics RAM from the CRT controller.

The CRT controller U20 is programmed to provide 24 fast sweeps per row of addresses. The

character size information is passed to column counter U14 to determine the number of fast sweeps per column. With an 8x8 dot matrix per small character, this gives 3 fast sweeps for every column for a small character, and 6 fast sweeps for every column for a large character.

The character size information is also passed to the load and clock multiplexer. The shift rate

for small characters is twice as high as the shift rate for the large characters. In the wave area

the characters are smaller than in the numeric area, 4x6 dot matrix instead of 5x7 dot matrix. All characters in the wave area and the inverse characters in the numeric area are displayed with half intensity.

Information from the CPU can only be written into the numerics RAM during the 2 ms horizontal retrace time. For large characters the ASCII information is written into the numerics RAM four times altogether.

Add X

I I

Small character

addressed once

Slow/fast Sync. Signal Generation

The CRT controller U20 also provides the slow sync. and the fast sync. signals for the video

circuits on the Mother Board and the display enable (DE) signal for the interpolation circuits on A3.

Clock Generation

Clock chip Ul provides the clock signal for the clock divider U6. The clock signals generated

here are used in the entire instrument.

2 ms Interrupt Signal Generation

The 2 ms interrupt circuit U2, U3, U8 is used to generate the shared memory access timing signals.

Alarm Trigger Generation

Add X Add X Large character

addressed

Add X Add x four times

4-l

The CPU generates the QRS, alarm and INOP trigger signals and latches these from the data bus into U32 (alarm latch). U32 passes the trigger signals to the Audio Board for further processing.

Theory Of Operation 1-9

Power Fail Circuit

In the event of power fail, the shared memory, U40, is buffered for at least 15 s. If power

returns after these 15 s, the power fail signal is delayed (30 ms after the reset signal). This creates a power-on reset, i.e. instrument set-up is reconfigured. If power returns before the

15 s are up, the instrument set-up is maintained.

Display Software

The Display software contains the following modules:

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Initialisation of CRT controller

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Self tests (ROM/RAMS/

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Service tests (CRT adjust, wave interpolation check)

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Keyboard handling

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Soft key labeling

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Display editing

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Processing and issuing of alarms

H Wave handling (wave addressing, wave RAM loading, erase

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bar control)

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Communication with the parameter software via the common shared memory

The display software is contained in one 32K x 8 EPROM (U26), and in one 8K x 8 EPROM (U50) on board 78354-66502, in one 16K EPROM (U50) on boards 78354-66602 and

78354-66702.

sounds test) and error handling

Note

I

lb

78353-66502 Board U26 is 16K x 8,

U47,U52,U54 and U55)

)

<ON RESET

) not included

l-10 Theory Of Operation