Eschmann TD-830 Service manual

TD830

ELECTROSURGICAL UNIT

Manual Service

698260

E-SM44h

Read these Instructions before use

Preliminary

Information

Technical data

Keep this‘Service Manual’in a safe convenient place for future reference. Read in conjunction with the relevant Publications detailed in the preliminary information section.

Safety notes

and alarms Eschmann After Sales Service Department

Introduction The Eschmann After Sales Service Department is staffed and equipped to provide advice and assistance during normal office hours. To avoid delays when making enquiries, please quote the

Model and Serial Number of your Electrosurgical Unit which is shown on the Serial Number plate,

Description

the location of which is shown below. Please ensure you include all alpha and numeric digits of

the Serial Number.

Maintenance

	Illustrated parts list	The Serial Number plate
		is located here, (view

from rear of unit).

Service Manual

For further information visit www.eschmann.co.uk

All correspondence relating to the after sales service of Eschmann Equipment to be addressed to :

UK Customers

Eschmann Equipment, Peter Road, Lancing, West Sussex BN15 8TJ, England. Tel: [phone]. Fax: [phone].

Overseas Customers

Contact your local distributor. In case of doubt contact Eschmann Equipment.

Patents and Trade marks

The ESCHMANN name and logo are trade marks of Eschmann Holdings Limited. “Eschmann Equipment” is a trading name of Eschmann Holdings Limited. “TD830” and “Flexoplate” are trade marks of Eschmann Holdings Limited.

Patents : GB2276551, GB2146534, AU673883, ZA94/2173, US5480399,

EP617925, IEE69100 and other Patents Pending.

Copyright © 2008 Eschmann Holdings Limited

All rights reserved. This booklet is protected by copyright. No part of it may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without written permission from Eschmann Holdings Limited.

The information in this publication was correct at the time of going to print. The Company, however, reserves the right to modify or improve the equipment referred to.

The CE marking affixed to the product certifies that it complies with the

European Medical Devices Directive 93/42/EEC and related legislation.

E-SM44h July 2008

TD830

ELECTROSURGICAL UNIT

CONTENTS

1.0 PRELIMINARY INFORMATION

6.0 MAINTENANCE

Preliminary information . . . . . . . . . . . . . . . . . . . . . . . . 4

2.0TECHNICAL DATA

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
Audible indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
Visual indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
Safety.. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Duty cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
Other symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
Button symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
Alarm symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
Environmental conditions . . . . . . . . . . . . . . . . . . . . . . .	8

3.0SAFETY NOTES & ALARMS

Do’s and Don’ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Alarm circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.0INTRODUCTION

General .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Operating modes / display option.. . . . . . . . . . . . . . . . 11 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Associated Publications . . . . . . . . . . . . . . . . . . . . . . . 11 Equipment certification . . . . . . . . . . . . . . . . . . . . . . . 11 Servicing .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5.0	DESCRIPTION
Construction . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . 14
Sub assembly descriptions . . . . . . . . . . .		. . . . . . . . . 14
Front panel . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . 14
Rear panel . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . 14
Mains transformer & rectification assy.		. . . . . . . . . 15
Main printed circuit board assembly . . .		. . . . . . . . 15
	Patient interface PCB . . . . . . . . . . .	. . . . . . . . 15
	Patient interface (plate) PCB . . . . . .	. . . . . . . . 16
	Tone generator PCB . . . . . . . . . . . .	. . . . . . . . 16
	PSU PCB . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 16
	Bipolar PCB . . . . . . . . . . . . . . . . . . .	. . . . . . . . 16
	Crowbar PCB . . . . . . . . . . . . . . . . .	. . . . . . . . 16
	PCM DC regulator PCB . . . . . . . . . .	. . . . . . . . 17
	Monopolar Power Amplifier PCB . . .	. . . . . . . . 17
	Spray and Monopolar PCB . . . . . . .	. . . . . . . . 17
	Relay PCB . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 17
	Logic and pulse PCB . . . . . . . . . . . .	. . . . . . . . 18
Power output graphs . . . . . . . . . . . . . . . . .		. . . . . . . . 18
Monopolar cut diagrams . . . . . . . . . . . .		. . . . . . . . 19
Monopolar blend diagrams . . . . . . . . . .		. . . . . . . . 20
Monopolar specialist cut diagrams . . . .		. . . . . . . . 21
Monopolar pinpoint coag diagrams . . . .		. . . . . . . . 22
Monopolar spray coag diagrams . . . . . .		. . . . . . . . 23
Bipolar macro diagrams . . . . . . . . . . . .		. . . . . . . . 24
Bipolar micro diagrams . . . . . . . . . . . . .		. . . . . . . . 25

Routine check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Systems check . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Cleaning disinfection and care . . . . . . . . . . . . . . . . . .	26
Access for maintenance . . . . . . . . . . . . . . . . . . . . . .	26
Top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Removal and installation . . . . . . . . . . . . . . . . . . . . . .	26
Circuit board removal (except crowbar) . . . . . . . .	26
Crowbar board removal . . . . . . . . . . . . . . . . . . . .	26
Rivet removal/replacement . . . . . . . . . . . . . . .	26
Circuit board replacement . . . . . . . . . . . . . . . . . . .	27
Supply faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
Fuse renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
Alarm remedies . . . . . . . . . . . . . . . . . . . . . . . .	27
Extender board . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Frequency of calibration . . . . . . . . . . . . . . . . . . . . . . .	28
Performance checks . . . . . . . . . . . . . . . . . . . . . . . . .	28
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Output waveform timings . . . . . . . . . . . . . . . . .	28
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Timing measurements . . . . . . . . . . . . . . . . . . .	28
Monopolar output currents . . . . . . . . . . . . . . . .	29
Specialist cut boost check . . . . . . . . . . . . . . . . . .	29
Monopolar current limit check . . . . . . . . . . . . . . . .	29
Bipolar output current . . . . . . . . . . . . . . . . . . . . . .	29
Active relay function test . . . . . . . . . . . . . . . . . . . . . .	29
Set up overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
System diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29

7.0ILLUSTRATED PARTS LISTS

Illustrated parts list 1 . . . . . . . . . . . . . . . . . . . . . . . . . 36 Illustrated parts list 2 . . . . . . . . . . . . . . . . . . . . . . . . . 38 Illustrated parts list 3 . . . . . . . . . . . . . . . . . . . . . . . . . 40 Illustrated parts list 4 . . . . . . . . . . . . . . . . . . . . . . . . . 42

ILLUSTRATIONS
Fig. 1 Part identification . . . . . . . . . . . . . . . . . . . . . . .	13
Fig. 2 Using the extender board . . . . . . . . . . . . . . . .	28
Fig. 3 Monopolar mode timing (part 1) . . . . . . . . . . .	31
Fig. 4 Monopolar mode timing (part 2) . . . . . . . . . . .	32
Fig. 5 Biopolar mode timing . . . . . . . . . . . . . . . . . . . .	33
Fig. 6 TD830 System diagram . . . . . . . . . . . . . . . . . .	44
TABLES
Table 1 Mono & Bipolar timings . . . . . . . . . . . . . . . . .	30
Table 2 TD830 set up overview . . . . . . . . . . . . . . . . .	34

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1.0PRELIMINARY INFORMATION

1.1This Service Manual should be referred to for details

of the TD830 Electrosurgical Unit, REF 83-256-01, 83-257-02, 83-258-03, 83-259-04, 83-260-05, 83-261-06, 83-262-07, 83-263-08, and 83-264-09 (serial number A9B0000 or above).

1.2Within the text of this manual the term ‘coag’ is used as a common abbreviation of the term ‘coagulation’.

1.3The TD830 Electrosurgical Unit requires a mains electrical supply corresponding to the voltage shown on the electrical rating plate at the rear of the unit. Only use the mains supply cable supplied. If the plug supplied prefitted is not suitable it should be replaced with a suitable plug with protective earthing contact.

1.4If the plug is a fused type, a 10A fuse must be fitted.

CAUTION

It is most important that fuses of the correct type, size and rating are installed (seeTechnical Data).

CAUTION

Read this ‘Service Manual’ carefully and note ALL of the warnings, cautions and safety notes contained within. Keep this ‘Service Manual’ close-to-hand at all times for reference.

1.5Ensure that the unit ‘mains’ switch (42 of Fig. 12) is in the ‘O’ position and that the output controls are set to minimum before connecting to, and switching ‘on’, the mains supply. A complete systems check must be carried out before using the Electrosurgery Unit (see the ‘Instructions for use’).

1.6Instructions for Use and Service Manuals should be readily accessible for reference prior to and when operating, cleaning and servicing the TD830 Electrosurgical Unit. All manuals are available from Eschmann Equipment, see inside front cover for address details.

Related Technical Publications:-

Instructions for Use - TD830:

Publication number E-IM54, Part No. 698257

Eschmann accessory ‘Instructions for use’: Publication number E-IM50, Part No.604802

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TD830

ELECTROSURGICAL UNIT

2. 0 TECHNICAL DATA

GENERAL

The TD830 Electrosurgical Unit (or Surgical Diathermy Unit) is classified as ‘HF surgical equipment’ 1

1- ‘HF surgical equipment’ is defined as, “Medical electrical equipment including its associated accessories intended for the performance of surgical operations, such as the ‘cutting’ 2 or ‘coagulation’ 3 of biological tissue by means of high frequency (h.f.) currents”.

2- ‘Cutting’ is defined as, “Resection or dissection of body tissue caused by the passage of high frequency current of high current density at the active electrode(s)”.

3- ‘Coagulation’ is defined as, “Sealing of small blood vessels or of body tissue caused by the passage of high frequency current at the active electrode(s)”.

Equipment - High power electrosurgical unit with monopolar and bipolar outputs

Type - Portable

DIMENSIONS

Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39.0 cm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19.0 cm
Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	42.5 cm
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . 15 kg
ELECTRICAL DATA

(Note:Voltage factory set by transformer tapping, according to model supplied.)

Output (bipolar)

			Peak
			Open
		Crest	Circuit
Symbol/Function	Power	factor	Voltage
Coagulation
Micro range	17W ±20%	Variable	150
	+10%
Macro range	50W -20%	Variable	230

Power and voltage output data diagrams are shown at the end of section 5.

Monopolar

Carrier frequency - 475kHz nominal, square wave.

Power control - Variable amplitude set by frontp a n e l controls. Preset pulse patterns set by mode switches.

Load resistance for maximum output power is 150 ohms (non-inductive) for cut and pinpoint coag and 200 ohms (non-inductive) for blend, specialist cut and spray coag.

Test load is 200 ohms (non-inductive) for cut and specialist cut and 400 ohms (non-inductive) for blend, spray coag and pinpoint coag.

Output (monopolar)

Output powers are measured to an accuracy of ±20%, with a maximum power of 400 watts.

Power Supply . . . . . . . . . . . . . . . . . . 230V a.c., 50-60Hz or, 240V a.c., 50-60Hz or, 220V a.c., 50-60Hz or, 110V a.c., 50-60Hz

Current (max.) . . . . .	. . . . 4.4A (230V) or, 4.2A (240V)
	or, 4.6A (220V)	or, 8.4A (110V)
Fuse rating (240V, 230V, 220V) . . . . . .		. . . . . 250V, T5A
Fuse rating (110V) . .	. . . . . . . . . . . . .	125V(min.),T10A

Fuse type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mm

Bipolar

Carrier frequency - 785kHz nominal, square wave.

Power control - Variable pulse group modu-lation set by front panel control. Amplitude set by micro/macro range buttons.

Load resistance for maximum output power

-100 ohms (non-inductive) for Macro

-50 ohms (non-inductive) for Micro

Test load - 100 ohms (non-inductive)

					Peak
					Open
				Crest	Circuit
Symbol/Function			Power	factor	Voltage
		Normal cut	345W(-20%)	1.9	1150
		Blend	300W(±20%)	3.0	2200
		Specialist cut	345W(-20%)	2.1	1500
		Pinpoint coag.	170W(±20%)	5.1	2150
		Spray coag.	79W(±20%)	8.7	4000

Power and voltage output data diagrams are shown at the end of section 5.

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AUDIBLE INDICATORS

SAFETY

Running tones *

Monopolar

Cut, blend or specialist cut	950Hz
Coagulation, pinpoint or spray	800Hz
Bipolar
Micro or macro	730Hz
(* Approximate values, adjustable volume)
Touch button

A ‘bleep’ indicates when any function button is pressed, the volume is adjustable with running tones above.

Alarm

All modes - alternating two tone preset to maximum volume (with flashing display).

VISUAL INDICATORS

Green lamp in mains ‘on/off’ switch to indicate power ‘on’ from the rear of the electrosurgical unit.

Digital displays and ‘function selected’LEDs indicate power ‘on’ from the front of the electrosurgical unit

Three digital displays indicate typical power* in cut, coag and bipolar modes. (Note: These can be set to display the typical power* available in watts, or a numerical value up to 10).

(* typical power is an indication of the average power delivered over a range of load resistances. It is less than the power delivered to the rated load for maximum power.)

Power output ‘activated’ LED indicators for:

Cutting modes	Yellow lamp
Coag modes	Blue lamp
Bipolar mode	Blue lamp

Green and bright green function selected LED indicators above (or below) the relevant touch buttons detailed as follows:

Monopolar:

Cut, blend, specialist cut (green)

Pinpoint coag (green)

Spray coag (bright green)

Bipolar:

Micro and macro power range (green)

General

Designed to comply with EN60601-1:1990 Medical electrical equipment - general requirements for safety and IEC60601-2-2: 1998 High-frequency surgical equipment - particular requirements for safety (3rd edition).

General classification, Class 1, Type CF (Defibrillator proof).

Drip-proof (IPX 1)

Patient leakage (risk) current: always less than 100 microamps to earth (ground) from all patient circuits at 230V 50Hz as required by EN60601-1:1990 for the unit in normal condition (typically less than 10 microamps).

Battery

This equipment contains a nickel metal hydride battery. In the event of failure of the display p.c.b. battery, or if the electrosurgical unit is to be disposed of, it is not necessary to remove the battery or to return it to Eschmann Equipment. The battery charge life is six months from a full charge of 48 hours. The battery charges automatically when the unit is ‘on’.

Electrode isolation

The plate electrode circuit of this equipment is isolated from earth at both high and low frequency. The bipolar output is also fully isolated at both high and low frequency.

Class

Class 1 denotes that the equipment must be earthed via the protective conductor in the 3-core mains cable connected to a 3-pin plug.

Safety category

This symbol denotes that the equipment is of type CF, i.e. that it complies with type CF leakage current requirements.The symbol also denotes that the equipment will not be damaged by defibrillator discharge and that the plate electrode need not be removed from the patient if a defibrillator is used.

Non-ionizing radiation

This symbol warns the user of the possibility of nonionizing radiation being emitted by this equipment.

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TD830

Flammable gases

The TD830 equipment is not suitable for use in the presence of a flammable anaesthetic mixture with air or with Oxygen or Nitrous Oxide.

Protection

IPX 1 This symbol (drip proof) denotes that the equipment meets the requirements of IEC529 for dripping water.

DUTY CYCLE

The duty cycle rating of 10 seconds ‘on’, 30 seconds ‘off’, specified on the serial plate as 10s:40s, indicates that the equipment can be used at full output power in any mode for 10 seconds with a 30 seconds rest period. The unit can remain connected to the mains electrical supply with the mains switch in the ‘on’ position continuously.The ‘on’ period at lower power levels can be extended.

OTHER SYMBOLS

Note: For numbers in brackets refer to Fig. 1.

This symbol above item (33) indicates the running tone volume control which has a minimum sound level

of 45dBA.

This symbol above items (1, 14, 21 and 33) indicates increasing power output (1, 14 and 21)

and increasing volume (33) for running tone and ‘bleep’ volume.

This symbol on the rear panel serial plate (39) and above the mains inlet (40) indicates that the equipment is for use on alternating current only.

This symbol on the rear panel serial plate indicates that the mains input fuses, rating and type, are as shown below the symbol.

The symbol on the front panel denotes that the plate electrode is isolated from earth at high frequency. (Note: The plate electrode is also known as the dispersive, neutral, return, indifferent or patient plate electrode and is often simply called the ‘pad’).

The symbol on the front panel adjacent to the active outputs (24 to 28) denotes dangerous voltages.

ELECTROSURGICAL UNIT

The symbol on the rear panel serial plate warns the user to read the accompanying documents, the‘Instructions for use’.

The symbol above sockets (25, 26, 27 and 28) denotes connection socket for a two button electrode handle (fingerswitch type).

The symbol adjacent to sockets (24, 26 and 31) denotes connection socket for a non-switched active handle actuated by a footswitch.

This symbolon the monopolar standby selection button (32) (monopolar ‘on/off’ toggle button) indicates standby mode for part of the equipment only.

The symbols Iandadjacent to the mains ‘on/off’ switch (42) indicate the ON and OFF positions respectively.

The symbol adjacent to item (34) indicates the ‘equipotentiality’ connection point. (Means for connection of a potential equalization conductor).

The symbol				adjacent to button (35) signifies the button

in the non-pressed (i.e. normal) state. (Digital display on the front of the electrosurgical unit is a typical power figure, e.g. 0-200watts for monopolar blend).

The symbol adjacent to button (35) signifies the button in the pressed (i.e. activated) state. (Digital display on the front of the electrosurgical unit shows a numerical value up to 10).

The symbol adjacent to sockets (36, 37 and 38) indicates the connection point for footswitches.

The symbol SN indicates serial number.

The symbol REF indicates catalogue number.

The symbol indicates date of manufacture.

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BUTTON SYMBOLS

Press to select bipolar - micro range

ENVIRONMENTAL CONDITIONS

FOR TRANSPORT AND STORAGE

Ambient temperature range: -30°C to +50°C

Press to select bipolar - macro range	Relative humidity range:
	30-90% RH non-condensing
	Atmospheric pressure range:
Press to select monopolar - cut	1060hPa down to 690hPa

Press to select monopolar - blend

Press to select monopolar - specialist cut

Press to select monopolar - pinpoint coag.

Press to select monopolar - spray coag.

ALARM SYMBOLS

PCM - Indicates the ‘Plate continuity monitor’ alarm has been activated.

PAM - Indicates the ‘Plate attachment monitor’ alarm has been activated.

PEM - Indicates the ‘Patient earth monitor’ alarm has been activated.

PVM - Indicates the ‘Plate voltage monitor’ alarm has been activated.

EPM - Indicates the ‘Excess power monitor’ alarm has been activated.

- Indicates the ‘Multiple activation’ alarm has been activated.

! - Indicates an internal fault has been detected (see section 5, Alarm conditions, in the ‘Instructions for Use’, for details).

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3.0SAFETY NOTES & ALARMS

Attention to the following points is necessary in order to reduce the risk of accidental burns during the use of this electrosurgical unit. Other safety notes and warnings are also given within the text of this manual and these should be noted before using this electrosurgical unit.

DO:

♦Use only Eschmann accessories, in particular active and plate electrodes and cables which should preferably be no more than 3 metres in length. All Eschmann accessories are rated above the corresponding maximum peak output voltage of this electrosurgical unit (see graphs in section 5). For reference Eschmann accessories can be used safely at the following h.f. peak voltages:

Bipolar active - 400 V peak Monopolar active - 4000 V peak

Monopolar plate electrode - 2250 V peak

♦Use bipolar techniques in preference to monopolar, whenever possible. For surgical procedures on parts of the body having a relatively small cross-sectional area, the use of bipolar techniques may be desirable to avoid unwanted coagulation.

♦Seek approved qualified advice (e.g. cardiology department) before using this electrosurgical unit on patients with implanted pacemakers or other active implantstoavoidinterferenceordamagetotheimplant. Monitor such patients carefully.

♦Set power output controls to the minimum setting before use and select the minimum power setting to achieve the desired effect.

♦Check all cables and accessories routinely before use. In particular, electrode cables and endoscopically usedaccessoriesforpossibledamagetotheinsulation.

♦Ensure the entire area of the plate electrode is reliably attached to the patient’s body and as close to the operating field as possible.

♦Store temporarily unused active electrodes such that they are isolated from the patient [e.g. use a quiver (REF 83-186-38) to hold active accessories when not in use].

ELECTROSURGICAL UNIT

DO NOT:

♦Do not use uninsulated forceps, monopolar or bipolar.

♦Do not place monitoring electrodes close to the operating site. When high frequency surgical equipment (i.e. electrosurgical equip-ment) and physiological monitoring equip-ment are used simultaneously on the same patient, any monitoring electrodes should be placed as far as possible from the surgical electrodes. Needle monitoring electrodes are not recommended. In all cases, monitoring systems incorporating high frequency current limiting devices are recommended.

♦Do not allow active cables to drape across or contact the patient's body or contact the cables or leads of other equipment.

♦Do not use flammable anaesthetics, flammable solvents or oxidizing gases such as nitrous oxide

(N2O) or oxygen if the surgical procedure is carried out in the region of the thorax or head, unless these agents are sucked away.

♦Do not allow the patient's body to touch conductive objects. The patient should not come into contact with metal parts which are earthed or which have an appreciable capacitance to earth, e.g. operation table, supports, etc. The use of antistatic sheeting is recommended for this purpose.

♦Do not use hook type active cables (with or without adapters designed for use with hook type cables) use 4 mm or 8 mm plug type active cables.

♦Do not reuse disposable plate electrodes.

♦Do not rely solely on surgical gloves to provide insulation.

♦Do not allow ‘skin-to-skin’ contact (e.g. between the arms and body of the patient), this can be avoided, for example by the insertion of adequate dry gauze.

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Attention to the following points will prolong the life and efficiency of your electrosurgical unit and will help to avoid the risk of accidents, or damage:

DO:

♦Switch off and disconnect from the mains electrical supply prior to cleaning the equipment and when it is not in use.

Patient Earth Monitor (PEM).

3.5 The PEM circuit detects a low impedance path between the patient and earth. It also reduces the chances of secondary contact electrosurgical burns. The circuit detects earth contact paths while the plate electrode is attached to the patient and the unit, when a monopolar fingerswitch or footswitch is pressed, but before the monopolar output is activated. If such an earth path is present, the alarm will operate until the path has been removed and the unit reset by reactivating a pressed monopolar footswitch or fingerswitch.

♦Grasp the connector(s) not the cable when connecting

and disconnecting cables and leads from the Plate Voltage Monitor (PVM).

equipment.

♦ContactthehospitalelectronicsengineerorEschmann After Sales Service Department if the equipment fails to function after checking.

♦Ensure the equipment is serviced regularly (at least every six months). Contact Eschmann After Sales Service Department for details.

DO NOT:

♦Use a faulty unit as failure could result in an unintended increase of output power.

3.6 Is designed to prevent dangerous electrosurgical voltages appearing on the patient’s body. Such voltages could occur because of insulation faults in the active circuit or because the active electrode is in contact with an earthed object and could cause burns at points of contact between the patient and conductive objects.This alarm will operate when monopolar output power is ‘on’ and the fingerswitch or footswitch is operated.This monitor will not detect a poor contact between the plate electrode and the patient. Note: Under specific electrical conditions, with the plate electrode completely detached from the patient, the PVM could alarm.

♦Servicethisequipmentunlessyouaresuitablyqualified Multiple Activation Alarm. to do so.

3.7Operates if more than one fingerswitch or footswitch

Alarm Circuits

is pressed at the same time in a given user section (i.e. monopolar USER 1 or USER 2 or bipolar). It will

3.1The unit has several alarm circuits as detailed in automatically be reset when ALL activations have been

the following sections.

Plate Continuity Monitor (PCM).

3.2 Ensures that the unit cannot be used in the monopolar mode with an electrically defective plate electrode or cable. It does not monitor the contact between the plate electrode and the patient’s body. It is reset automatically when a satisfactory plate electrode and cable are connected to the unit.

Plate Attachment Monitor (PAM).

3.3 Ensures that the unit cannot be used in the monopolar mode if a divided plate electrode is attached to the patient’s body incorrectly. Applies only when a divided plate electrode is used and will not operate if monopolar is switched ‘off’ by the monopolar standby selection button.

Excess Power Monitor (EPM).

3.4 The unit monitors its output power in monopolar and bipolar modes, compares this with the maximum allowed power under single fault conditions and alarms, disabling output, if the delivered power exceeds the allowed value by more than a certain margin.

released. This alarm will also operate if a footswitch or fingerswitch is being activated when the unit is switched ‘on’. (Note:This could indicate a damaged accessory locked in the ‘on’ position).

Internal error alarm

3.8 Operates if an internal fault arises such as power being detected when not enabled by a footswitch or fingerswitch.

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4.0INTRODUCTION

GENERAL

Note: For numbers in brackets refer to Fig. 1.

4.1The TD830 electrosurgical unit provides two outputs both for high power monopolar cut and coag (on a first come first served basis), together with a separate output for bipolar coag. Bipolar coag output is available simultaneously with either monopolar output. The unit incorporates touch button controls, seven segment LED (light emitting diode) displays and LED visual indicators.

4.2The digital displays can show two scale modes, one shows the typical power available in watts the second shows a numerical value up to 10 (the latter is only displayed whilst digital display range selection toggle button (35) is held pressed).

Note: The power delivered depends on the resistance between the active electrode and the plate electrode (or between the tips of bipolar forceps) at the time the power is applied.This resistance can vary widely and many times per second during the application of h.f. output.

4.3The unit incorporates several alarm code indicators as detailed in the Technical Data section. Innovative safety features include a divided plate electrode monitoring system called the Plate Attachment Monitor (PAM) as well as the standard Eschmann Plate Voltage Monitor (PVM), Patient Earth Monitor (PEM) , and Plate Continuity Monitor (PCM). An Excess Power Monitor (EPM) and a Multiple activation alarm are also included. A high frequency leakage control circuit is included in the monopolar mode.

4.4Within this manual the terms USER 1 and USER 2 are used to distinguish between the two monopolar outputs. The bipolar output is fully independent of the monopolar output and can be considered as USER 3.

OPERATING MODES / DISPLAY OPTION

Monopolar mode

ELECTROSURGICAL UNIT

Monopolar standby mode

4.9 The unit can be switched into monopolar standby mode, inwhichonlybipolarpowerisavailable,usingmonopolarstandby selection button (32).This button is a toggle switch, each press of the button will turn monopolar mode‘on’(if‘off’) or‘off’(if‘on’). This button (32) can be considered as an ‘on/off’ switch for monopolar, the advantage being that if only bipolar outputs are required and monopolar standby mode is selected, no plate electrode needs to be connected to the unit. (If monopolar standby mode is not selected for‘bipolar use only’and a patient plate electrode is not connected to the unit the PAM alarm or PCM alarm will activate).The unit is in monopolar standby mode when only the digital display for bipolar can be seen illuminated.

Digital display options

4.10 The digital displays normally show the typical power* available in watts. The digital displays can also show a numerical value up to 10 (maximum).To display the power setting as a numerical value up to 10 press and hold the digital display range selection button (35). The display will revert to the normal setting (and display the typical power* available in watts) when the button is released.

(* typical power is an indication of the average power delivered over a range of load resistances. It is less than the power delivered to the rated load for maximum power.)

ACCESSORIES

4.11 The equipment is designed to be used with the Eschmann range of active, plate and bipolar cables. The front panel is colour coded, PALE BLUE for bipolar, YELLOW for monopolarcut,blendandspecialistcut,andBLUEformonopolar coag. For a list of all accessories see the ‘Instructions for use’.

ASSOCIATED PUBLICATIONS

4.12 This manual contains service and maintenance instructions for user servicable parts (PCBs are deemed to be none user serviceable) and an illustrated parts list. For detailed user instructions refer to the TD830 Instructions for Use, E-IM44 (part number 698257).

4.5The monopolar operating mode offers a choice of EQUIPMENT CERTIFICATION

fingerswitch or footswitch control of ‘cut’ or ‘coagulation’ outputs for USER 1. Fingerswitch operation utilises the Eschmann two-button fingerswitch whilst footswitch control requires the use of an active electrode handle in conjunction with one of a range of electrical footswitches.

Bipolar mode

4.6Bipolar coag is an efficient method of effecting haemostasis, and closure of vessels such as Fallopian tubes. It is extremely safe to use, as the main current path is between the tips of the bipolar forceps and the tissue held between them is directly in view of the surgeon at all times.

4.7A plate electrode is not required and safety is increased even further as two power range outputs are available allowing precise setting of the power output.

4.8The bipolar mode of operation offers a choice of footswitch, electrical or pneumatic.

4.13 The electrosurgical unit fully complies with the major international safety standards (see Technical Data). (Note: Tested at 230V).

CAUTION

This electrosurgical unit is to be operated by medically qualified personnel only.

SERVICING

4.14It is recommended that electrosurgical safety checks and routine servicing are carried out at regular intervals (every six months) and only by Eschmann trained personnel or Eschmann trained hospital engineers, otherwise the warranty could be infringed.

4.15Read the information given in this manual carefully before using, cleaning, sterilizing, or servicing the electrosurgical unit.

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1Power output control, BIPOLAR

2MICRO BIPOLAR selected, indicator (green LED)

3Touch button, MICRO BIPOLAR

4MACRO BIPOLAR selected, indicator (green LED)

5Touch button, MACRO BIPOLAR

6BIPOLAR digital power display (green seven segment LEDs)

7BIPOLAR, power activated indicator (blue LED)

8MONOPOLAR CUT digital power display (green seven segment LEDs)

9MONOPOLAR CUT, power activated indicator (yellow LED)

10MONOPOLAR (normal cut) selected, indicator (green LED)

11Touch button MONOPOLAR (normal cut)

12MONOPOLAR (blend) selected, indicator (green LED)

13Touch button MONOPOLAR (blend)

14Power output control, MONOPOLAR (cut)

15Touch button MONOPOLAR (specialist cut)

16MONOPOLAR (specialist cut) selected, indicator (green LED)

17MONOPOLAR COAGULATION (pinpoint) selected, indicator (green LED)

18MONOPOLAR COAGULATION (spray) selected, indicator (bright green LED)

19Touch button MONOPOLAR COAGULATION (pinpoint)

20Touch button MONOPOLAR COAGULATION (spray)

21Power output control MONOPOLAR COAGULATION

22MONOPOLAR COAGULATION, power activated indicator (blue LED)

23MONOPOLAR COAGULATION digital power display (green seven segment LEDs)

248mm active electrode socket USER 1 only (footswitch activation only) - red

25Fingerswitch sockets (for use with active electrode socket 26) - black

264mm active electrode socket USER 1 (footswitch or fingerswitch activation) - red

27Fingerswitch sockets (for use with active electrode socket 28) - black

284mm active electrode socket USER 2 (fingerswitch activation only ) - red

29‘S’ (scope) connector socket (for use with flexible endoscopes)

30Plate electrode connector socket - black

31Bipolar output socket - white

32Monopolar standby selection button (monopolar ‘on/off’ toggle button)

33Running tone volume control

34Potential equalization point (see Technical Data section)

35Digital display range selection button (display in watts if not held pressed)

36Bipolar pneumatic (white) footswitch socket

37Bipolar electric (white) footswitch socket

38Sockets for monopolar footswitches (blue, yellow or combination blue and yellow)

39Serial number plate

40Mains cable connection socket

41Mains fuses (see technical data)

42Mains power on/off control (with internal green lamp)

A1	- PCM alarm activated LED	A5	- EPM alarm activated LED
A2	- PAM alarm activated LED	A6	- MULTIPLE ACTIVATION alarm LED
A3	- PEM alarm activated LED	A7	- Internal error alarm activated LED
A4	- PVM alarm activated LED

All alarms are accompanied by an audible two tone warning and the activated digital displays will flash (i.e. if in monopolar standby mode, only the bipolar digital display will flash).

Key to Figure 1

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Figure 1 - Part identification

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5.0DESCRIPTION

CONSTRUCTION (See Fig. 6)

5.1The TD830 Electrosurgical unit is made of four principle electronic sub assemblies as listed below :

♦Front panel

♦Rear panel

♦Mains transformer and rectification assembly

♦Main printed circuit board assembly

5.2The front panel includes the display and control board, operator controls, finger switch inputs and the RF outputs.

5.3The rear panel includes the foot switch interface, mains input switch and lamp, display control switch and the tone volume control.

5.4The mains transformer and rectification assembly, fitted inside on the right hand side (when viewed from the front) on a metal base plate, provides mains isolation and voltage conversion, protection and a 180V d.c. rectified power feed to the RF power section.

5.5The main printed circuit board assembly, positioned within the unit on the left hand side (when viewed from the front) fitted on a metal base plate, controls and supplies all the RF outputs.

SUB ASSEMBLY DESCRIPTIONS

(see Fig.6)

Front panel

5.6The front panel assembly comprises a main display and control board (see 5.7) with its buttons, LEDs and three 7 segment displays (Bipolar, Monopolar Cut and Monopolar Coag). There are three Potentiometer controls for setting RF power levels (Bipolar, Monopolar Cut and Monopolar Coag), a Bovie sensing microswitch and pivot assembly. The panel also includes the connectors and cabling for the four RF outputs (Plate, Bipolar, Mono1, Mono 2 and Bovie). There are two current sense toroids, the larger for leakage sensing and the smaller for output current sensing.

5.7The main display and control board performs the following functions:-

iUses the front panel control knobs to set the maximum allowable power for each mode.

iiAllows mode selection (IC4) and display (IC8) through 8 front panel buttons and associated LEDs (Bipolar Macro or Micro; Specialist Cut, Normal Cut or Blend; Pinpoint Coag. or Spray Coag. and Standby).

iiiProvides the controls for all RF outputs through a 64-way ribbon cable (J6).

ivProvides alarm control and logic (IC6) and illuminates an LED to indicate the type of Alarm.

vProvides three digital 7 segment displays (IC13, IC1, IC5) for power levels of Bipolar, Cut and Coag.

viProvides all logic for foot and finger switch controls (IC12, IC11).

viiProvides Battery back up of the last mode selection before switching off (BATT1, IC2,IC4).

viiiUses the Bovie sense microswitch to enable the RF routing to the Bovi RF output for Mono user 1.

ixProvides CMOS (IC9, IC10) and open collector drives (IC7) for the main printed circuit board assembly.

xProvides control signals as follows:

SPEC	BLEND
CUT	SPRAY
CUTMODE	COAGMODE
MONENABLE	BIPENABLE
BIP_LOW	MONORELAY1_SEL
PEM_RELAY	MONORELAY2_SEL

MONORELAYBOVI_SEL

xiProvides Tone Generator controls as follows: BLEEP_TONE CUT_TONE COAG_TONE BIPOLAR_TONE ALARM_TONE

xiiReceives Foot and Finger switch signals as follows: FINGERCUT_1 FINGERCOAG_1 FINGERCUT_2 FINGERCOAG_2 FOOTCUT_1 FOOTCOAG_1

FOOTAIR_BIP FOOTELEC_BIP

xiii Receives alarm signals as follows:

PVM	PAM
PCM	PEM
MONOPWRDET	BIP_EXCESS
MONO_EXCESS

ALARM SQUARE (from Tone generator).

5.8 The one set up potentiometer (VR1) is factory set at manufacture and does not need resetting during the life of the product.

Rear panel (see Fig. 6)

5.9 The rear panel provides connection to the mains a.c. supply via an IEC inlet (which includes fuses, switch and integral green lamp), also fitted to the rear panel are:

iA volume control potentiometer.

iiA range switch.

iiiTwo Monopolar footswitch circular multi-pin connectors

ivAn electrical Bipolar footswitch connector.

vA pneumatic Bipolar footswitch connector.

viThe Rating and Serial Number plate.

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viiA 15 way interconnect cable (from the footswitches, range switch, volume control and the Mother board of the main PCB Assembly).

viiiMains interconnect to the Mains Transformer Assembly.

ixSafety earth strap for the rear panel.

5.10The two Monopolar footswitch circular multi-pin connectors are wired together so that either of two footswitches can enable RF power.

5.11The range switch selects either normal power levels or a 0–10 range when pressed (see the ‘Instructions for Use’ supplied with the unit).

Mains transformer & rectification assembly

(see Fig.6)

5.12 The mains transformer and rectification assembly comprises a 50/60Hz mains transformer with several secondaries providing the following:

i50 V a.c. (Bipolar low/Micro) and 75V a.c. (Bipolar high/Macro) for the Bipolar Output.

ii15 V a.c. (rms) for the +15V output supply from the PSU board.

iii15V a.c. (rms) for the -15V output supply from the PSU board.

iv5V a.c. (rms) for the +5V output supply from the PSU board.

5.13The above a.c. supplies are connected to the motherboard at SK12 through a 9-way cable and connector from the Transformer PCB.They are short circuit protected by thermistors, which recover when an overload is removed.

5.14Another secondary provides the feed for a rectifier whose output from the PCB is through a 2-wire (P1) connection to a large reservoir capacitor fitted near the transformer. This provides a 180V d.c. power feed to the Monopolar outputs which are supplied from the capacitor to the mother board at SK13. This secondary is protected by an internal over temperature sensor. Fitted to the discharge resistor is a capacitor so that energy is drained away to make the capacitor safe when the mains power is switched off.

5.15The mains input voltage is factory selected by links on the input connector P10.

Main printed circuit board assembly (see Fig. 6)

5.16 The main printed circuit board assembly comprises a motherboard assembly (Part No 715205) which supports the other boards that make up the main printed circuit board assembly. The motherboard provides the inter-board connections and power feeds to the other boards of this assembly and is positioned horizontally under them. The other boards are listed below and are detailed in their own sections:

♦Patient Interface (Active) PCB

♦Patient Interface (Plate) PCB

ELECTROSURGICAL UNIT

♦Tone Generator PCB

♦PSU PCB

♦Bipolar PCB

♦Crowbar PCB

♦PCM DC regulator PCB

♦Monopolar Power Amplifier PCB comprising the:

♦Spray and Monopolar PCB which includes the:

♦Relay PCB

♦Logic and pulse PCB

5.17The motherboard receives power from the mains transformer (SK12), 180V d.c. power (SK13), control from the front panel (SK2) and the rear panel (SK14) and current (SK3) and leakage sensor (SK4) feedback.The rear panel footswitch circuitry has an isolated supply (IC3) and interface (IC’s 1 and 2) providing 250V AC isolation.

5.18Capacitors are fitted to the motherboard (C1-2, C4- 7, C10, C13-14, C15 A-I) to protect against RF interference.

Patient Interface (Active) PCB (Part No 715201)

5.19This board is fitted in the front slot nearest the display board (SK3 of the Mother board). It receives a single Monopolar Active RF power feed on PL4-2.

5.20It also receives control signals (MONORELAY_1, MONORELAY_2, MONORELAY_BOVI) and returns finger switch signals (FINGERCOAG_1, FINGERCUT_1, FINGERCOAG_2 and FINGERCUT_2) to the display board through the motherboard and the 64-way ribbon connector.

5.21The Monopolar RF feed is routed by HV RF relays to one of three outputs: Mono1 (connector PL1 through Relay RL3), Mono2 (PL2, RL1) or Bovi (PL3, RL2).This is done under control from the display board (signal names MONORELAY_1, MONORELAY_2, MONORELAY_BOVI).

5.22In addition to the RF power output feed to Monopolar 1 there are two finger switch control lines which allow activation of Cut or Coag RF power (PL1-2, PL1-1).These lines are supplied with a sensing drive signal (IC1, TR1, L1) through a transformer (TX10) and return to two optoisolators (O11, O12). When a fingerswitch is pressed that line causes current to flow through the opto-isolator and activate the control signal from the PIA active board to the display board (signal names FINGERCOAG_1, FINGERCUT_1).

5.23The same applies to Monopolar 2 (PL2-3, 4). (Optoisolators O13, O14, signal names FINGERCOAG_2 and FINGERCUT_2).

5.24Fingerswitch signals (FINGERCUT/COAG_1,_2) are returned to the Display board through the motherboard and the 64-way ribbon connector.

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