Toshiba DP1600 Service Handbook page 164

C25 Scanner unit watch dog error
This error occurs when the watchdog register fails to be cleared within every certain time inter-
val on the scanner control PWA (occurrence of a watchdog interrupt).
If C25 still occurs even after the power is turned off and then on, replace the scanner control
PWA.
C26 Peak detection error
Does the lamp light up during initialization after the power is turned on?
NO (=The lamp does not light)
1. Check if the connector of the lamp is disconnected, or the harness is broken.
2. Check if the connector of the inverter is disconnected, or the harness is broken.
3. Check if any conductor pattern on the inverter and scanner control PWA is
4. Replace the lamp.
5. Replace the inverter.
6. Replace the scanner control PWA.
7. Replace the relay PWA.
8. Replace the main PWA.
YES (=The lamp lights)
1. Check if the shading plate behind the document scale is dirty.
2. Check if the lens can be seen when looking the first carriage from the top.
3. Check if the optical system is extremely dirty or damaged.
4. Check if the FFC of the CCD PWA is disconnected.
5. Check if any conductor pattern on the CCD and scanner control PWA is open- or short-
circuited.
6. Replace the CCD unit.
7. Replace the scanner control PWA.
8. Replace the relay PWA.
9. Replace the main PWA.
1600/2000/2500 TROUBLESHOOTING
open- or short-circuited.
4 - 40 December 2000 © TOSHIBA TEC