C9403, C9404 (bizhub C750i)
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Contents
| Trouble type | C9403: CIS LED lighting failure C9404: CIS LED lighting abnormally |
| Rank | B |
| Trouble detection condition | C9403: At the CIS gain adjustment, the machine detected that the output of the CIS LED is lower than the specified value. C9404: After a scan job is completed, the machine detected that the average output of the CIS LED is greater than the specified value. |
| Trouble isolation | Scanner |
| Relevant electrical parts | -CIS cable -CIS module (CIS) -CIS power supply (CISPU) -CPU board (CPUB) -Base board (BASEB) |
Procedure
- Check the back side scanning shading shaft for any stain, and clean up it as necessary.
- Check that the bushing of the back side glass cleaning roller unit is on the standby position.
- Correct the harness connection between CIS CN2-BASEB CN5 if faulty.
- Correct the harness connection between CIS CN1-CISPU CN2 if faulty.
- Check CPUB for proper installation and correct as necessary.
- Measure the voltage of CISPU CN1-2.
- Control signal: CISPU CN1-2 (DC12V)
- Location of electrical component: DF 4-I
- Measure the voltage of CIS CN1-1, CN1-2 and CN1-5.
- Control signal: CIS CN1-1 (DC5V), CIS CN1-2 (DC5V), CIS CN1-5 (DC12V)
- Location of electrical component: DF 5-I
- For any abnormality in the measurement result, replace the CIS cable.
- Replace CIS. (Part# AAMPR70100)
- Replace CISPU. (Part# A3CKH00200)
- Replace CPUB. (Part# ACKNH02P03)
- Replace BASEB. (Part# ACKNH02101)