Printer Is Printing Solid Black - Konica Minolta bizhub 4020 Service Manual

Actions
Step 3
Check the transfer roll for surface contamination or excessive
wear.
Is it free of contamination and wear?
Step 4
Check the transfer roll left contact spring for damage.
Is it free of damage?
Step 5
Reseat the cables JLSU1 and J6 on the controller board.
Does the problem remain?
4.2.5 Printer is printing solid black pages
Actions
Step 1
Check the imaging unit for damage.
Is it free of damage?
Step 2
Remove any contamination from the imaging unit contacts.
Does the problem remain?
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Yes
Go to step 4.
Go to step 5.
Replace the power
supply.
Yes
Go to step 2.
Go to step 3.
No
Replace the transfer
roll.
Replace the printer.
The problem is solved.
No
Replace the imaging
unit.
The problem is solved.