Ricoh FT 4015 Service Manual page 214

SERVICE CALL CONDITIONS
CODE #13 — ZERO CROSS SIGNAL ERROR
- Definition -
The CPU does not receive the zero cross signal within 2.0 seconds, or
the interval between zero cross signals is more than 2.0 seconds.
- Possible Causes -
•
Defective main control board
•
Defective ac drive/dc power supply board
•
Zero cross line open
•
CN101 on the main control board or CN207 on the ac drive/dc power
supply board is not correctly connected.
CODE #21 — SCANNER HOME POSITION ERROR 1
- Definition -
The scanner home position sensor's output remains LOW (de-actuated)
for 10 seconds after the main switch is turned on, or the output remains
LOW (de-actuated) after the scanner returns during the copy process.
- Possible Causes -
•
Defective home position sensor
•
Defective scanner drive motor
•
Defective main control board
•
Defective ac drive/dc power supply board
•
Defective scanner drive circuit
CODE #22 — SCANNER HOME POSITION ERROR 2
- Definition -
The scanner home position sensor's output remains HIGH (actuated) for
4.0 seconds after the main switch is turned on, or the output remains
HIGH (actuated) for 0.3 seconds after the scanner starts.
- Possible Causes -
•
Defective home position sensor
•
Defective scanner drive motor
•
Defective main control board
•
Defective ac drive/dc power supply board
•
Defective scanner drive circuit
•
F2 on the ac drive/dc power supply board open (blown fuse).
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20 December 1996