19. TROUBLE CODE Field Service Ver. 2.0 Jul. 2009
800
TROUBLESHOOTING
19.5.87 C2552: Abnormally high toner density detected cyan TCR sensor
19.5.88 C2554: Abnormally high toner density detected magenta TCR sensor
19.5.89 C2556: Abnormally high toner density detected yellow TCR sensor
19.5.90 C2557: Abnormally low toner density detected black TCR sensor
Relevant parts
Imaging unit /C
Imaging unit /M
Imaging unit /Y
Toner cartridge /C
Toner cartridge /M
Toner cartridge /Y
Sub hopper unit
Printer control board (PRCB)
Step Action
WIRING DIAGRAM
Control signal
Location (Electri-
cal component)
1 Reinstall toner cartridge — —
2 Reinstall imaging unit — —
3 Change imaging unit — —
4 PRCB ICP17 conduction check — —
5 Change PRCB — —
6 Change sub hopper unit — —
Relevant parts
Drum unit /K
Toner cartridge /K
Toner empty sensor/K (PZS/K)
Toner supply motor/K (M12)
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 M12 operation check
(At this time, IU must be non-installation.)
PRCB CN19-13 to 16 C-20
3 M14 operation check PRCB CN20-9 to 12 K-6
4 Reinstall drum unit/K — —
5 Reinstall toner cartridge — —
6 If the toner empty sensor and its surround-
ings inside the sub hopper are dirtied with
toner, clean them.
——
7 Change drum unit /K — —
8 Change PRCB. — —
1
Service Manual Y110571-1
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