Konica Minolta bizhub 4020 Service Manual page 160

Actions
Step 7
1. Replace the ADF unit. See
2. POR the machine into Configuration menu >Disable
Scanner. From there, select Enabled to change the setting
to re-enable the scanner module and then save the setting.
3. POR the MFP to operating mode. Run a copy from the
flatbed.
Did the 840.xx error reoccur?
Step 8
Inspect JFBM1, JHOME1 and JCIS1 on the controller board.
Are they properly connected?
Step 9
Properly connect all the connections.
Did the 840.xx error reoccur?
Step 10
1. Replace the flatbed unit. See
2. POR the machine into Configuration menu >Disable
Scanner. From there, select Enabled to change the setting
to re-enable the scanner module, and then save the setting.
3. POR the MFP to operating mode. Run a copy from the
flatbed.
Did the 840.xx error reoccur?
Step 11
Replace the controller board. See
bizhub 4020/3320 Service Manual
ADF unit removal.
Flatbed assembly removal.
Controller board removal.
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Yes No
Go to step 8. The problem is
solved.
Go to step 10. Go to step 9.
The problem is Go to step 10.
solved.
Go to step 11. The problem is
solved.
The problem is Contact second-level
solved. support.