C2557 (bizhub 287/227)

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Contents

Trouble type	C2557: Abnormally low toner density detected black TCR sensor
Rank	B
Trouble detection condition	When sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the toner hopper.
Trouble isolation	–
Relevant electrical parts	-Developing unit/K -Toner cartridge/K -Toner empty sensor/K (PS31) -Toner cartridge motor (M10) -Toner supply motor/K (M6) -MFP board (MFPB)

 Procedure

1. Perform image troubleshooting procedure if image density is low.
2. Reinstall developing unit/K.
3. Reinstall toner cartridge/K.
4. Check the connector between the developing unit-relay CN15-MFPB CN17E for proper connection and correct as necessary.
5. M10 operation check
   • Control signal: MFPB CN22E-5 to 8
   • Location of electrical component: 20-J
6. M6 operation check
   • Control signal: MFPB CN22E-1 to 4
   • Location of electrical component: 20-J
7. If the toner empty sensor and its surroundings inside the toner hopper are dirtied with toner, clean them.
8. Replace the developing unit/K. (Part# A7Y003D)
9. MFPB F13E, F14E conduction check
10. Replace MFPB. (Part# A7AHH0201D)

NOTICE

• Link to the wiring diagram (bizhub 367/287/227)

K.3.9.4 (Link to the Field Service Manual)