Olivetti d-color MF651, Service Manual, Page: 792 / 1053

19. TROUBLE CODE Field Service Ver. 2.0 Jul. 2009
732
TROUBLESHOOTING
C4301 PH cooling fan motor
failure to turn
• The fan motor lock signal remains HIGH for
a predetermined continuous period of time
while the motor remains stationary.

B
C4501 Laser malfunction • SOS signal is not detected even after the
lapse of a given period of time after staring
the laser output.
• SOS signal is not detected for a given
period of time during printing or IDC sensor
adjustment.
 B
C5104 Transfer belt motor’s
failure to turn
• The motor lock signal remains HIGH for a
predetermined continuous period of time
while the motor remains stationary.
 B
C5105 Transfer belt motor’s
turning at abnormal timing
• The motor lock signal remains LOW for a
predetermined continuous period of time
while the motor remains stationary.

B
C5304 IH cooling fan motor/1’s
failure to turn
• The fan lock signal remains HIGH for a pre-
determined continuous period of time while
the motor remains stationary.

B
C5306 IH cooling fan motor/2’s
failure to turn
• The fan lock signal remains HIGH for a pre-
determined continuous period of time while
the motor remains stationary.
 B
C5351 Power supply cooling fan
motor/1’s failure to turn
• The fan lock signal remains HIGH for a pre-
determined continuous period of time while
the motor remains stationary.

B
C5354 Ozone ventilation fan
motor’s failure to turn
• The fan lock signal remains HIGH for a pre-
determined continuous period of time while
the motor remains stationary.

B
C5356 Cooling fan motor’s
failure to turn
• The fan lock signal remains HIGH for a pre-
determined continuous period of time while
the motor remains stationary.
 B
C5370 MFP control board cooling
fan motor’s failure to turn
• The fan lock signal remains HIGH for a pre-
determined continuous period of time while
the motor remains stationary.

B
C5372 MFP control board CPU
temperature failure
• Temperature failure of CPU on the MFP
board was detected.

C
Code Item Detection timing
Trouble iso-
lation
Rank
Service Manual Y110571-1