Ricoh FT5580 Service Manual page 181

Code #2D: No Encoder Output
Definition:
Lights when the output frequency from the encoder is not detected for
490 milliseconds after the scanner motor is energized.
Observation:
1) At power-up, the scanner overdrives home position.
2) During the copy cycle the scanner at first moves, then stops.
3) The scanner overruns home position when it returns.
4) The scanner will not move at all.
Points to Check:
Check the scanner drive motor, the scanner home position sensor, and
CN306-2 on the optics board.
Code #31: Drum Thermistor Blown
Definition:
Lights when the drum thermistor circuit is open.
Observation:
Copies are dirty.
Points to Check:
C h e c k t h e r e s i s t a n c e b e t w e e n C N 3 6 - 3 a n d C N 3 6 - D o n t h e I D s e n s o r
board.
(Reference value: 10 kohms at 25°C)
Check CN103-13 on the main PCB.
Code #52: Thermofuse Blown
Definition
Lights if the thermofuse circuit becomes open or the fusing unit is not set
correctly.
Observation
Code #52 is displayed immediately after main switch is turned on.
Points to Check
Confirm that +24 volts exists at CN102-B19 on the main board.
Confirm that the fusing unit is properly set.
10-5
12 June 1987