Ricoh FT8680 Service Manual page 364

SYSTEM ERROR AND SERVICE CALL CONDITIONS
SC100 - Lamp Intensity Sensor Calibration Error
Definition:
During process data initialization, the CPU cannot calibrate the sensor output
to 3 V even with a 100% duty cycle PWM signal to the exposure lamp
stabilizer.
NOTE: After resetting the system error condition, the adjustment will be
tried again. Even if the second execution fails, no service call
condition is displayed and the copier uses previous reference
data until its next initialization.
Points to check:
•
Fiber optics cable for the exposure lamp intensity sensor
•
Flat cable
•
Exposure lamp
•
FL Stabilizer
•
Power input for the FL stabilizer (38 V: CN641-1 and 2, 5 V: CN641-3
and 4)
•
Exposure lamp heater
•
Exposure lamp heater thermistor
•
DC drive PCB
•
Main PCB (Photodiode)
SC101 - Exposure Lamp Malfunction - Abnormal On
Definition:
During the lamp off condition,the main PCB detects a lamp intensity sensor
signal (1.0 V) for more than 3 seconds.
Points to check:
•
Fiber optics cable for the exposure lamp intensity sensor
•
Exposure lamp
•
FL stabilizer
•
FL stabilizer trigger (PWM: CN641-5)
•
External light to the photodiode on the main PCB
•
Main PCB (Photodiode)
6-2
31 July 1995