Konica Minolta bizhub C360 Service Manual page 700

Field Service Ver. 2.1 Feb. 2012
19.5.50 C2551: Abnormally low toner density detected cyan TCR sensor
19.5.51 C2553: Abnormally low toner density detected magenta TCR sensor
19.5.52 C2555: Abnormally low toner density detected yellow TCR sensor
19.5.53 C2557: Abnormally low toner density detected black TCR sensor
Developing unit/Y,M,C,K
Toner cartridge/Y,M,C,K
Toner near empty switch/Y (RS4)
Toner near empty switch/M (RS5)
Toner near empty switch/C (RS6)
Toner near empty switch/K (RS7)
Step
1 Perform image troubleshooting procedure if
image density is low.
2 Reinstall developing unit
3 Reinstall toner cartridge
4 Check the connector between developing
unit-FREYB CN4, CN6, CN8, CN10 for
proper connection and correct as neces-
sary.
5 Check the connector between FREYB
CN1, CN2-PRCB CN4, CN5 for proper
connection and correct as necessary.
6 M6, M7 operation check
7 M8, M9 operation check
8 If the toner empty sensor and its surround-
ings inside the sub hopper are dirtied with
toner, clean them.
9 Change developing unit
10 Change FREYB
11 PRCB ICP3,4 conduction check
12 Change PRCB
Relevant parts
Action
Toner cartridge motor/YM (M6)
Toner cartridge motor/CK (M7)
Toner supply motor/YM (M8)
Toner supply motor/CK (M9)
Front side relay board (FREYB)
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
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—
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—
—
PRCB CN13-12 to 15 (M6)
PRCB CN13-16 to 19 (M7)
PRCB CN12-9 to 12 (M8)
PRCB CN12-13 to 16 (M9)
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—
—
—
—
19. TROUBLE CODE
Location (Electri-
cal component)
—
—
—
—
—
J-21
J-10
—
—
—
—
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