Konica Minolta bizhub 4020 Service Manual page 149

Action
Step 1
POR the machine.
Did the control panel, fuser, fan, and drive motor function at
startup?
Step 2
Run some print jobs.
Did any errors occur?
Step 3
Check the cables on the controller board.
Are they properly connected?
Step 4
Properly connect all the cables on the controller board.
Does the error remain?
Step 5
Check the power coming to the controller from the power supply.
Verify the following voltages:

+5 V at pins 17 and 19

GND at pins 18, 20

+24 V at pins 11, 13, and 15
Are the voltages correct?
Step 6
Replace the power supply.
Does the error remain?
Step 7
Is the control panel functioning properly?
Step 8
Perform the control panel service check. Go to
service check.
Does the error remain?
bizhub 4020/3320 Service Manual
Control panel
- 148 -
Yes No
Go to step 2. Go to step 3.
Go to step 3. There is no issue.
Go to step 5. Go to step 4.
Go to step 5. The problem is
solved.
Go to step 7. Go to step 6.
Go to step 7. The problem is
solved.
Go to step 9. Go to control panel
service check. Go to
Control panel service
check
Go to step 9. The problem is
solved.