Ricoh FT8680 Service Manual page 365

31 July 1995
SC104 - Exposure Lamp Malfunction - Abnormal Off
Definition:
The main PCB cannot detect a lamp intensity sensor signal (1.0 V) during the
lamp on condition for more than 0.5 seconds.
Points to check:
•
Fiber optics cable for the exposure lamp intensity sensor
•
Flat cable
•
Exposure lamp
•
FL Stabilizer
•
FL stabilizer power input (38 V: CN641-1 and 2, 5 V: CN641-3 and 4)
•
DC drive PCB
•
Main PCB (Photodiode)
SC105 - FL Thermistor Open
Definition:
The main PCB detects an extremely high resistance (> 14k: –10°C) of the FL
thermistor for more than 3 seconds during stand-by mode.
NOTE: 1. No detection in copy mode because of the FL heater off.
2. 24 V (VP) and 38 V (VFL) will be cut by the relays on the dc
drive PCB in this SC condition.
Points to check:
•
FL thermistor
•
Main PCB (CN102-B20)
SYSTEM ERROR AND SERVICE CALL CONDITIONS
6-3