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C2557 (bizhub 4750i/4050i)
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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 lower than a predetermined value for a predetermined number of times in a row even though there is toner in the toner cartridge. |
Trouble isolation | – |
Relevant electrical parts | -Imaging unit/K -Toner transport motor (M4) -Toner supply motor (M5) -CPU board (CPUB) -Base board (BASEB) |
Procedure
- Perform image troubleshooting procedure if image density is low.
- Reinstall the imaging unit.
- Check the connector between the imaging unit/K-relay CN6-BASEB CN14E for proper connection and correct as necessary.
- Check the connector between M4-BASEB CN11E for proper connection and correct as necessary.
- Check the connector between M5-BASEB CN11E for proper connection and correct as necessary.
- Check CPUB for proper installation and correct as necessary.
- M4, M5 operation check
- Control signal: BASEB CN11E-1 to 4 (M4), BASEB CN11E-5 to 8 (M5)
- Location of electrical component: 4-C
- Replace the imaging unit. IUP35K (Part# AAJV01D)
- Replace CPUB. (Part# ACT9H01003)
- Replace BASEB.
4750i (Part# ACT9H02013)
4050i (Part# ACT9H02002)