Olivetti d-color MF651, Service Manual, Page: 859 / 1053

Field Service Ver. 2.0 Jul. 2009 19. TROUBLE CODE
799
TROUBLESHOOTING
19.5.84 C2551: Abnormally low toner density detected cyan TCR sensor
19.5.85 C2553: Abnormally low toner density detected magenta TCR sensor
19.5.86 C2555: Abnormally low toner density detected yellow TCR sensor
Relevant parts
Imaging unit /C
Imaging unit /M
Imaging unit /Y
Toner cartridge /C
Toner cartridge /M
Toner cartridge /Y
Toner empty sensor/C (PZS/C)
Toner empty sensor/M (PZS/M)
Toner empty sensor/Y (PZS/Y) Toner supply motor/Y (M9)
Toner supply motor/M (M10)
Toner supply motor/C (M11)
Toner cartridge motor Y/M (M13)
Toner cartridge motor C/K (M14)
Printer control board (PRCB)
Step Action
WIRING DIAGRAM
Control signal
Location (Electri-
cal component)
1 Perform image troubleshooting procedure if
image density is low. — —
2 Clean the TCR sensor window on the
underside of the imaging unit if dirty — —
3 Reinstall imaging unit — —
4 Reinstall toner cartridge — —
5
M9, M10, M11 operation check
(At this time, IU must be non-installation.)
M9: PRCB CN19-1 to 4
M10: PRCB CN19-5 to 8
M11: PRCB CN19-9 to 12
C-21
6
M13, M14 operation check
M13: PRCB CN20-5 to 8
M14: PRCB CN20-9 to 12
K-6
7 If the toner empty sensor and its surround-
ings inside the sub hopper are dirtied with
toner, clean them. — —
8 Change imaging unit — —
9 PRCB ICP1 or ICP2 conduction check — —
10 Change PRCB. — —
Y110571-1 Service Manual