Schott-Fostec A20800 DCR III
SFSchott-Fostec · Model A20800 DCR III
DC-regulated light source limits light fluctuation to ± 0.5% due to line voltage variation Universal input voltage – accepts 90 to 265 VAC Current limiting – protects the unit from over heating due to defective and aging bulbs. Transient protection – allows remote location of bulb. Lamp change indicator light - LED located on front panel changes from green to red when lamp requires replacement. Soft start “lamp saver” circuitry IR filter for cool illumination Solid state dimmer control for continuous dimming Interchangeable Modulamp Units offer 2 lamp positions to maximize individual lamp efficiencies. Choice of three, 150 watt halogen lamps - EKE, EJA and DDL Can power the RS232 from the 9-pin connector Built-in 9-pin connector for analog remote control or RS-232 connection (A20601) Detachable IEC cord Quiet fan cooling CSA approved to UL spec, CE compliant to low voltage and EMC directives Low housing temp – slightly above ambient.
Key tips
- ·Never defeat or bypass a return-electrode monitoring (REM) alarm to finish a case - it's a direct burn risk.
- ·Verify OR table battery backup - a table that loses power mid-procedure is a real, documented incident type.
- ·Track surgical light lamp-hours rather than waiting for failure - a sudden failure mid-case is avoidable.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
No or dim illumination / lamp fault
HighSymptoms: No light output, dim or flickering light, lamp-hours alarm, colour shift.
Root cause: Xenon / LED lamp at end of life, a lamp power supply fault, or a light-cable fault.
Poor video image
HighSymptoms: Noisy, dark, discoloured or out-of-focus image, dropouts, no image.
Root cause: Camera head / coupler fault, a camera-cable fault, or a CCU / video-processor fault.
White-balance / colour fault
MediumSymptoms: Cannot white-balance, persistent colour cast.
Root cause: Camera head sensor drift, a dirty coupler, or the light source colour temperature.
Overheating / fan fault
LowSymptoms: Thermal shutdown, loud fan, hot exhaust.
Root cause: Failed or clogged cooling fan.
Output / connector fault
LowSymptoms: Signal only on one output, connector damage, HD/SDI dropout.
Root cause: Worn video output connector or an output board fault.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Xenon / LED lamp module
Class Frequent wear itemRel. cost $$$R&R Fairly easy
Camera head / coupler
Class Periodic replacementRel. cost $$$R&R Moderate
Camera cable
Class Periodic replacementRel. cost $$R&R Fairly easy
Fibre-optic light cable
Class Periodic replacementRel. cost $$R&R Easy
CCU / video-processor board
Class Major service partRel. cost $$$R&R Difficult
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Xenon / LED lamp module | Frequent wear item | $$$ | Fairly easy |
| Camera head / coupler | Periodic replacement | $$$ | Moderate |
| Camera cable | Periodic replacement | $$ | Fairly easy |
| Fibre-optic light cable | Periodic replacement | $$ | Easy |
| CCU / video-processor board | Major service part | $$$ | Difficult |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Pre-case functional check
- ·Electrosurgical return-electrode cable inspection
- ·Table hydraulic / mechanical inspection
- ·Annual electrical safety test and full PM
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: No or low RF output / high-impedance cut-out
- Confirm good electrode-tissue contact and an adequately wetted field.
- Inspect the handpiece / instrument and its cable for damage; substitute a known-good one.
- Check the split dispersive (return) pad is well applied over well-perfused muscle with a sound cable.
- Verify output into a resistive test load with an electrosurgical analyser.
- Replace the RF output board and recalibrate on a non-conductive surface if output is confirmed absent (anti-static handling).
Symptom: Return-electrode (REM / NESSY / CQM) contact-quality alarm
- Re-apply a fresh split dispersive pad with full skin contact.
- Check the pad cable and its connector.
- Try a known-good pad.
- Run the contact-quality-monitor calibration with a good pad fitted.
- Refer the CQM circuit if it still alarms.
Symptom: Output will not activate from the footswitch or handswitch
- Test the other activation method to isolate the pedal from the handpiece.
- Inspect the footswitch and its cable / connector for damage or moisture.
- Check the handswitch leads on the handpiece.
- Substitute a known-good footswitch.
- Refer the activation input board if both methods fail.
Symptom: Fails calibration / output drifts after a repair
- Verify cut and coag output at several settings into a test load with an analyser.
- Verify the REM / CQM circuit against its spec.
- Recalibrate per the service manual on a non-conductive bench with anti-static precautions.
- Check the cooling fan and thermal path.
- Re-verify all outputs and the REM alarm before returning to service.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Operating rooms
- Procedure rooms
- Interventional suites
Documents & Manuals
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