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24 February, 1999
SC CODES
SC
Item
Detection Conditions
No.
SC101 Exposure
- Timing & Condition -
• The lamp output check
lamp failure
signal (LAMPDET) is still
HIGH 250 ms after the
lamp turns on (the ON
check is canceled if the
lamp goes off within 250
ms).
• The lamp output check
signal is still LOW 30ms
after the lamp turns off (the
OFF check is canceled if
the lamp turns on within 30
ms).
Related
Possible Causes
SCs
• Blown lamp
• Blown thermostat
• Blown fuse
(FU103)
• Defective lamp
regulator
• Poor connection of
cables
• Defective cables
• Defective scanner
IPU board
• Defective PSU
1
Troubleshooting Procedure
1. Visually check the lamp element or check the continuity
between both ends of the lamp terminals with a multi-
meter.
2. Check continuity at the ends of the thermostat
terminals with a multi-meter.
3. Check if the connectors (CN1, CN2, and CN3) on the
lamp regulator are properly connected.
4. Check the continuity of the 3 cables.
5. Replace the lamp regulator if 100Vac is present at the
CN3-1 and 5 on the lamp regulator.
6. Replace the scanner IPU board
- Signals to Check -
• LAMPDET: CN502-2 on lamp regulator / CN403-12 on
scanner IPU board
• LAMPTRIG: CN403-11 on scanner IPU board / CN502-
3 on lamp regulator
SC CODES
Type
D
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