Controller board service check
Service checks which involve measuring voltages on the LVPS/HVPS (low voltage power supply/high voltage power
supply) board should be performed with the printer positioned on its back side.
Note: When making voltage readings, always use frame ground unless another ground is specified. See the wiring
diagram in the back of the book for more information.
Warning—Potential Damage: Do not replace the control panel and controller board at the same time. Each card
contains the printer settings. When either of these cards is new, it obtains some of the settings from the other card.
Settings are lost when both are new and replaced at the same time.
Action Yes No
Step 1
POR the machine.
Did the control panel, fuser, fan, and drive motor function at startup?
Go to step 2. Go to step 3.
Step 2
Run some print jobs.
Did any errors occur?
Go to step 3. There is no issue.
Step 3
Check the cables on the controller board.
Are they properly connected?
Go to step 5. Go to step 4.
Step 4
Properly connect all the cables on the controller board.
Does the error remain?
Go to step 5. The problem is solved.
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?
Go to step 7. Go to step 6.
Step 6
Replace the power supply.
Does the error remain?
Go to step 7. The problem is solved.
Step 7
Is the control panel functioning properly?
Go to step 9. Go to control panel
service check. Go to
“Control panel service
check” on page 143.
7016
Diagnostic information
142
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