DORC 1100 User manual

MICRO
DIATHERMY
SYSTEM
Type 1100
SERVICE
MANUAL
D.O.R.C. International b.v.
Scheijdelveweg 2
3214 VN Zuidland
The Netherlands
Phone : (+31) (0) 181 45 80 80
Fax : (+31) (0) 181 45 80 90
E-mail : [email protected]
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Contents Page
Section 1 General ..............................................................1
Section 2 Specifications .........................................................2
Section 3 Warnings ...........................................................4
Section 4 Cautions .............................................................5
Section 5 Short instructions .....................................................6
Section 6 Block diagram ........................................................7
Section 7 Schematic diagrams ...................................................8
Section 8 Adjustment manual ..................................................12
Section 9 Servicing and adjustment .............................................14
Section 10 Spare parts manual ..................................................16
Appendix A ...................................................................17
Figure List
Fig.1 Diathermy output ...............................................2
Fig.2 Diathermy unit - Front panel ......................................6
Fig.3 Diathermy unit - Rear panel .......................................6
Fig.4 Diathermy Block diagram .........................................7
Fig.5 Logic PCB schematic ............................................8
Fig.6 Logic PCB Layout ..............................................9
Fig.7 RF-Power PCB schematic .......................................10
Fig.8 RF-Power PCB Layout ..........................................11
Fig.9 RF output at maximum preset setting ...............................15
Fig.10 Diathermy unit - Inside ..........................................16
The contents of this document are confidential and the sole property of D.O.R.C. International b.v.
This document may not be reproduced in whole or in part, by photography or print or any other
means, without written permission from D.O.R.C. International b.v.

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Section 1
GENERAL
The Dutch Ophthalmic Research Center (D.O.R.C.) is an innovative company that is involved in
research, development and manufacturing of high quality instruments and equipment for ophthalmic
surgery.
All D.O.R.C. products have been clinically tested before they were released to the ophthalmic
surgeon.
D.O.R.C. plans to be able to be of service to the ophthalmic profession with even more innovative
helpful products, for many years to come.
This Service manual should be helpful to you, while working with your D.O.R.C. MICRO
DIATHERMY SYSTEM. Of course we are willing to listen to any possible suggestions that make
the Service Manual even more useful.

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0
1
2
3
4
5
6
7
8
9
Power P (W)
0 20 40 60 80 100
Preset (%)
300Ω
600Ω
1200Ω
Diathermy Output
Load
Figure 1 - Diathermy output
0
2
4
6
8
10
12
Power P (W)
200 400 600 800 1000 1200
Load R
100
50
20
Preset
(%)
(Ω)
Section 2
SPECIFICATIONS
GENERAL:
Apparatus :MICRO DIATHERMY SYSTEM
Type : Type 1100
Weight :5,5 Kg
Dimensions :13 x 22,5 x 29 cm.
MAINS INPUT:
Mains supply :100-110 VAC (50/60 Hz)
230-240 VAC (50/60 Hz)
Fuses :2x at 100/110VAC 1 AT
2x at 230/240VAC 500 mAT
Power Consumption :45 VA
OUTPUT (values at room temperature)
RF output power :12 Watt (MAX.), see fig.1
RF Frequency :13.56 Mhz, Cristal controlled.

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AMBIENT CONDITIONS:
Operating temperature :15-40EC
Humidity :85% Max.
The D.O.R.C. Diathermy system complies with the safety standards as described in the international
norm IEC601-1, Type BF, Class 1

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Section 3
WARNINGS
A warning:
Indicates a potentially harmful situation to yourself or others.
Electric shock hazard
The Diathermy system contains high voltage circuits.
After performing any repair, calibration procedure performs a final electrical safety check
and leakage current test.
Unplug the power cord before cleaning or servicing the unit. Should the power cord or plug
become cracked, frayed broken or otherwise damaged, it should be replaced immediately.
Do not touch any exposed wiring or conductive surface, whilst the cover is off and the unit
energized. The voltages present, when electric power is connected to the Diathermy system,
can cause injury or death.
Never wear a grounding wrist strap when working on a energized unit.
The operator should now perform any servicing except as specifically stated in the
Instruction Manual.
Do not, under any circumstances, perform any testing or maintenance on medical
instruments, while they are being used to monitor a patient. Always turn the Diathermy
system off before cleaning.
Explosion hazard
Never use this Diathermy system in the presence of flammable anaesthetics.

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Section 4
CAUTIONS
A caution:
Indicates a condition that may result in equipment damage or malfunction.
Electrostatic discharge through the printed circuit boards will damage the components of the
Diathermy system. Handle all circuit boards (replacements and defective) by their non-
conductive edges and use anti-static containers when transporting them.
Before servicing the equipment, ground yourself and the tool to discharge any accumulated static
charge by wearing a static control wrist strap.Use hospital-grade grounded receptacle only.
Servicing of this product, in accordance with the Service Manual, should never be undertaken in
the absence of proper tools, test equipment and the most recent revision of the Service Manual,
which must be clearly and thoroughly understood.
Do NOT apply tension on the line cord.
Check rear panel voltage setting before connecting the Diathermy system to AC main power.
NEVER IMMERSE THIS UNIT IN LIQUID !!

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Section 5
SHORT INSTRUCTIONS
NOMENCLATURE OF FRONT PANEL.
1. Power button.
2. Preset regulator.
3. RF Output connector.
4. RF Output indicator
Fig. 2 Diathermy unit - Front Panel
NOMENCLATURE OF REAR PANEL.
1. A/C Outlet with fuse
holder.
2. Footswitch
connector.
3. Earth Potential
Equalization.
Fig. 3 Diathermy unit - Rear Panel

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6. BLOCKDIAGRAMS
Fig. 4 Diathermy unit - Blockdiagram

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Section 7
SCHEMATIC DIAGRAMS
Fig.5 LOGIC PCB SCHEMATIC.

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Fig. 6 LOGIC PCB LAYOUT

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.Fig. 7 RF-POWER PCB SCHEMATIC.

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Fig. 8 RF-POWER PCB LAYOUT

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Section 8
ADJUSTMENT MANUAL
GENERAL INFORMATION.
Warnings.
Before servicing, please read the information given in the chapter "WARNINGS" of this
manual.
Technical assistance.
Assistance with servicing is available from D.O.R.C. INT. Service department either by letter to the
following address or by Facscimile or Telephone.
Returns for repair or calibration.
To return a Diathermy system to the D.O.R.C. Service Department A written description including
the following information must accompany all returned units:
1 The customer name, address and telephone number.
2 The customer account number.
3 A description of the problem or service desired.
4 The return authorization number.
Returned products should be shipped including footswitch and any handpiece which may be
associated with the fault.
Replacement parts.
Replacement parts. may be obtained from the:
Dutch Ophthalmic Research Center International b.v.
Scheijdelveweg 2
3214 VN Zuidland
The Netherlands
Phone : (+31) (0) 181 45 80 80
Fax : (+31) (0) 181 45 80 90
E-mail : [email protected]

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Introduction and applicability of this manual.
The service manual give the information required to maintain and repair the Micro Diathermy
system . In order to understand this manual it is necessary to have a complete understanding of the
functions of the Micro Diathermy system. This information can be obtained from the Instruction
Manual of the Micro Diathermy system
Usually field service for Micro Diathermy system is limited to swapping the suspected circuit
boards, measuring units etc.
Depending on the capabilities of the service facility, some repairs may not be possible ; e.g.
troubleshooting the main modules of the Micro Diathermy system without proper test equipment
and qualified personal. In such cases the faulty parts or the complete Micro Diathermy system
should be send to D.O.R.C. International b.v.
General troubleshooting.
Field service of the Micro Diathermy system is intended to be done as board swapping where
possible. The most important part of the trouble shooting is to pinpoint the faulty module, in most
cases the main board. After any service, test procedure described in Appendix A should be carried
out.

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Section 9
SERVICING AND ADJUSTMENT
Recommended tools and test equipment.
ITEM SPECIFICATION
1. Auto-Ranging Multimeter Fluke Model 77 or equivalent.
2. Scopemeter Fluke model 97 or equivalent.
3. Miniature Inspection Light
4. Inspection mirror
5. Set of Flat-tip Screwdrivers Non-inductive
6. RF Powermeter Contact your local dealer
Adjusting Logic
-Adjust with P2 the voltage on KL2 pin 9 of the preset button low to 0,3 Volt ± 0.05 Volt
-Adjust with P1 the voltage on KL2 pin 9 of the preset button high to 3,7 Volt ± 0.05 Volt
-Set Diathermy unit into minimum preset position Regulate P2 in such a way that the output will
just start (measure the RF output with a suitable RF-meter).
-Adjust with P4 the loudness of the buzzer, during diathermy action, in a useful setting.
Adjusting RF Power
-Connect the Diathermy output to a non-inductive resistor of 600S/25 Watt and measure the sinus
output.(Preset level maximum).
-Adjust with CT1 & 2 the output to the most perfect sinus shape. See fig 2.
Use for the next adjustment a suitable RF-powermeter or contact your local dealer.
-Connect the diathermy testcable between the unit and the RF-meter, use a LOAD of 600S.
-Set Diathermy unit into maximum preset position, adjust the vario-capacitor (CT2) to maximum
-Set preset into midway position and regulate with CT 1 (the small vario-capacitor) to maximum
RF output.
-Regulate with P3 the RF power to 6 W ± 20% (preset maximum).

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Fig. 9 - RF Output at maximum preset setting
After previous adjustments are performed, check the following:
-Preset position “1" =>the RF output has a value of maximum 1.5 W
If applicable, re-tune the RF output with P2.
Repeat if necessary adjustment procedure for an optimum result.

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Section 10
SPARE PARTS MANUAL
Fig. 10 Diathermy unit - Inside
Pos. Description Partnr.
1Output connector VNR0322
2Preset potmeter VNR0550
3Main-switch VNR0092
4Coax connector VNR0878
5/6 Diathermy Module EV 826
7Power transformer VNR0169

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APPENDIX A
After Service Test Procedure
The following test should be performed after any service to ensure proper operation of the system.
Check if the repaired module meets the specifications as described in the Service- or Instruction
Manual.
Carry out the following Electric Safety check:
- Earth Leakage Current general.
- Enclosure Leakage Current
- Patient Leakage Current
Above tests should be performed in accordance with the requirements of IEC601-1 clause 19.