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
Introduction
Description
Maintenance
Illustrated parts list
Eschmann After Sales Service Department
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,
the location of which is shown below. Please ensure you include all alpha and numeric digits of
the Serial Number.
The Serial Number plate
is located here, (view
from rear of unit).
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: +44 (0) 1903 765040. Fax: +44 (0) 1903 875711.
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.
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.
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 (see Technical
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
P4/44E-SM44h
TD830TD830
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ELECTROSURGICAL UNIT
2. 0TECHNICAL DATA
GENERAL
The TD830 Electrosurgical Unit (or Surgical Diathermy
Unit) is classified as ‘HF surgical equipment’
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
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
Output (monopolar)
Output powers are measured to an accuracy of ±20%, with
a maximum power of 400 watts.
Peak
Open
CrestCircuit
Symbol/Function PowerfactorVoltage
Normal cut345W(-20%) 1.9 1150
Blend300W(±20%) 3.0 2200
Specialist cut345W(-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.
Test load - 100 ohms (non-inductive)
E-SM44hP5/44
AUDIBLE INDICATORS
SAFETY
Running tones *
Monopolar
Cut, blend or specialist cut950Hz
Coagulation, pinpoint or spray800Hz
Bipolar
Micro or macro730Hz
(* 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
and bipolar modes. (Note: These can be set to display the
typical power*
to 10).
(
* typical power
delivered over a range of load resistances. It is less
than the power delivered to the rated load for maximum
power.)
available in watts, or a numerical value up
is an indication of the average power
typical power*
in cut, coag
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.
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 non-
ionizing radiation being emitted by this equipment.
P6/44E-SM44h
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.
TD830TD830
TD830
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ELECTROSURGICAL UNIT
The symbol on the rear panel serial plate warns the
user to read the accompanying documents, the ‘Instructions
for use’.
Protection
IPX 1This 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.
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 symbol on the monopolar standby selection button
(32) (monopolar ‘on/off’ toggle button) indicates standby
mode for part of the equipment only.
The symbols I and adjacent 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).
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.
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.
E-SM44hP7/44
BUTTON SYMBOLS
ENVIRONMENTAL CONDITIONS
FOR TRANSPORT AND STORAGE
Press to select bipolar - micro range
Press to select bipolar - macro range
Press to select monopolar - cut
Press to select monopolar - blend
Press to select monopolar - specialist cut
Press to select monopolar - pinpoint coag.
Press to select monopolar - spray coag.
Ambient temperature range:
-30°C to +50°C
Relative humidity range:
30-90% RH non-condensing
Atmospheric pressure range:
1060hPa down to 690hPa
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).
P8/44E-SM44h
3.0SAFETY NOTES & ALARMS
TD830TD830
TD830
TD830TD830
ELECTROSURGICAL UNIT
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
implants to avoid interference or damage to the implant.
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
used accessories for possible damage to the insulation.
♦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].
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.
E-SM44hP9/44
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.
♦Grasp the connector(s) not the cable when connecting
and disconnecting cables and leads from the
equipment.
♦Contact the hospital electronics engineer or Eschmann
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.
♦Service this equipment unless you are suitably qualified
to do so.
Alarm Circuits
3.1The unit has several alarm circuits as detailed in
the following sections.
Plate Continuity Monitor (PCM).
3.2Ensures 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.
Patient Earth Monitor (PEM).
3.5The 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.
Plate Voltage Monitor (PVM).
3.6Is 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.
Multiple Activation Alarm.
3.7Operates if more than one fingerswitch or footswitch
is pressed at the same time in a given user section (i.e.
monopolar USER 1 or USER 2 or bipolar). It will
automatically be reset when ALL activations have been
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
3.8Operates if an internal fault arises such as power
being detected when not enabled by a footswitch or
fingerswitch.
Plate Attachment Monitor (PAM).
3.3Ensures 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).
3.4The 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.
P10/44E-SM44h
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ELECTROSURGICAL UNIT
4.0 INTRODUCTION
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
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.
4.4 Within 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
4.5The monopolar operating mode offers a choice of
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.
typical
power available in watts the second
Monopolar standby mode
4.9The unit can be switched into monopolar standby mode,
in which only bipolar power is available, using monopolar standby
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
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
available in watts) when the button is released.
(
* typical power
delivered over a range of load resistances. It is less than
the power delivered to the rated load for maximum power.)
is an indication of the average power
typical power*
typical power*
ACCESSORIES
4.11The 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
monopolar cut, blend and specialist cut, and BLUE for monopolar
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).
EQUIPMENT CERTIFICATION
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
4.14 It 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.
4.15 Read the information given in this manual carefully
before using, cleaning, sterilizing, or servicing the
electrosurgical unit.
E-SM44hP11/44
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 LEDA5 - EPM alarm activated LED
A2 - PAM alarm activated LEDA6 - MULTIPLE ACTIVATION alarm LED
A3 - PEM alarm activated LEDA7 - 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
P12/44E-SM44h
TD830TD830
TD830
TD830TD830
ELECTROSURGICAL UNIT
Figure 1 - Part identification
E-SM44hP13/44
5.0 DESCRIPTION
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).
viii Uses 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.
PVMPAM
PCMPEM
MONOPWRDETBIP_EXCESS
MONO_EXCESS
ALARM SQUARE (from Tone generator).
5.8The 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)
5.9The 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.
P14/44E-SM44h
TD830TD830
TD830
TD830TD830
ELECTROSURGICAL UNIT
viiA 15 way interconnect cable (from the footswitches,
range switch, volume control and the Mother board
of the main PCB Assembly).
viii Mains interconnect to the Mains Transformer
Assembly.
ixSafety earth strap for the rear panel.
5.10 The two Monopolar footswitch circular multi-pin
connectors are wired together so that either of two
footswitches can enable RF power.
5.11 The 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.
5.13 The 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.
5.14 Another 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.
5.15 The 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:
♦ 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
5.17 The 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.
5.18 Capacitors are fitted to the motherboard (C1-2, C47, C10, C13-14, C15 A-I) to protect against RF interference.
Patient Interface (Active) PCB (Part No 715201)
5.19 This 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.
5.20 It 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.
5.21 The 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).
5.22 In 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).
5.23 The same applies to Monopolar 2 (PL2-3, 4). (Optoisolators O13, O14, signal names FINGERCOAG_2 and
FINGERCUT_2).
5.24 Fingerswitch signals (FINGERCUT/COAG_1,_2)
are returned to the Display board through the motherboard
and the 64-way ribbon connector.
E-SM44hP15/44
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