Lexmark X734DE - Page 188

2-150 Service Manual
7526
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Operator panel display blank, five beeps, and LED is off
Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part
of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits
five beeps, and then sticks in a continuous pattern until the printer is turned off.
Operator panel display blank, five beeps, LED on
Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part
of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits
five beeps, and then sticks in a continuous pattern until the printer is turned off.
Operator panel display all diamonds, no beeps
Step Questions / actions Yes No
1 Is the operator panel assembly cable properly
installed at system board JOPP1 and at the
operator panel assembly?
Go to step 2. Reinstall the cable.
2
Measure the voltage between JOPP1 pin 2
and ground on the system board.
Is the voltage approximately +5 V dc?
Go to step 3. Replace the system board.
See “System board
removal” on page 4-165.
3
Check continuity of the operator panel
assembly cable.
Is there continuity?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-26.
Replace the top cover
access assembly. See
“Top access cover
assembly removal” on
page 4-43.
Step Questions / actions Yes No
1 Check for ground between JOPP1 pin 4 and
ground.
Is the voltage approximately 0 V dc?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-26.
Go to step 2.
2
Check the operator panel assembly cable.
Is the cable damaged?
Replace the top cover
access assembly. See
“Top access cover
assembly removal” on
page 4-43.
Replace the system board.
See “System board
removal” on page 4-165.
Step Questions / actions Yes No
1 Check the operator panel assembly cable.
Is the cable damaged?
Replace the top access
cover assembly. See “Top
access cover assembly
removal” on page 4-43.
Go to step 2.
2
Measure the voltage between JOPP1 pin 2
and ground on the system board.
Is the voltage approximately +5 V dc?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-26.
Replace the system board.
See “System board
removal” on page 4-165.