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Operator Panel Button Service Check (5770)
1
Operator Panel
Cable
Photo Controller
Board
2
Operator Panel
Assembly
3
Operator Panel
Assembly
Photo Controller
Board
System Board to
Photo Controller
Board Cable
System Board
Operator Panel Display Service Check (5770)
1
Operator Panel
Assembly
Operator Panel
Cable
Photo Controller
Board
System Board to
Photo Controller
Board Cable
2-10
Service Manual
If the operator panel display is OK, but the buttons
do not function, check the operator panel cable for
continuity and replace the cable if necessary. If the
symptom remains, replace the photo controller
board.
Run the
"Button Test (5770)" on page
the buttons fail, replace the operator panel
assembly.
Check all cables for proper connection. With
power applied to the printer, disconnect JP1 from
the photo controller board. Check for +5 V dc at
JP1-2 on the controller board. If correct, replace
the operator panel assembly. If incorrect, check for
+5 V dc at pins P1-28 and P1-29. If voltage is
correct, replace the photo controller board. If
incorrect, check for +5 V dc at pins J9-28 and
J9-29 on the system board. If correct, replace the
system board to photo controller board cable. If
the voltage at J9 is incorrect, replace the system
board.
If the operator panel is blank and the printer
completes POST, voltage is not getting to the
operator panel. Trace the +5 V dc line to the
operator panel and replace the failing part. Trace
+5 V dc at pins JP1-2, P1-28 and P1-29 on the
photo controller board and pins J9-28 and J9-29
on the system board.
If all diamonds are displayed after the printer
completes POST, check the operator panel cable
for continuity and replace the cable if necessary. If
the symptom remains, replace the photo controller
board.
Run the "LCD Test (5770)," on page 3-2. If the test
does not show all PELS, replace the operator
panel assembly.
3-2. If any of
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