Controller board service check
Service checks which involve measuring voltages on the power supply should be performed with the printer
positioned on its rear 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.
Does the error remain?
Go to step 3. The problem is
solved.
Step 3
Check all cables on the controller board.
Are they connected properly?
Go to step 5. Go to step 4.
Step 4
Properly connect all the cables on the controller board.
Does the error remain?
The problem is
solved.
Go to step 5.
Step 5
Unplug the cable JPS1 from the controller board, and verify the
following voltages from the cable:
• +5 V at pins 11, 12, 13, 14, 15, 16
• GND at pins 18, 20
Are the voltages correct?
Go to step 7. Go to step 6.
Step 6
Replace the power supply.
Does the error remain?
The problem is
solved.
Contact the next
level of support.
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 167.
4514-6xx
Diagnostics and troubleshooting
165