2-48 Service Manual
7525-xxx
Operator panel display is dim and unchanging
Op panel USB cable service check
USB service check
Step Questions / actions Yes No
1 Turn off the printer, and remove the rear
shield. See “Rear shield removal” on
page 4-7. Disconnect the cable at JOPP1 on
the controller board. Verify the following
values:
Are all these values approximately correct?
Go to step 2. Replace the controller
board. See “Controller
board removal” on
page 4-18.
2
Check for continuity in the operator panel
cable connector.
Do all the conductors indicate continuity?
Replace the operator panel.
See “Operator panel
removal” on page 4-103.
Replace the operator panel
cable. See “Op panel
cable” on page 4-106.
Step Questions / actions Yes No
1 Check the op panel USB cable for
continuity.
Is there continuity?
Replace the controller
board. See “Controller
board removal” on
page 4-18
Replace the Op panel USB
cable.
Step Questions / actions Yes No
1 Is the USB cable properly connected to the
MFP and host PC?
Go to step 2. Properly connect the cable
at both ends.
2 Try a different USB cable. Does this fix the
issue?
Issue fixed. Go to step 3.
3 Connect a different device to the USB cable.
Did the host PC see the device?
Replace the RIP/system
board.See “Controller
board removal” on
page 4-18.
There is an issue with the
host machine.
JOPP1
Pin Voltage
10 V dc
2 +5 V dc
30 V dc
4 Ground
5 +5 V dc
6 +3.3 V dc
7 Ground
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