Lexmark X734de Service Manual page 188

7526
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.
Step Questions / actions
Is the operator panel assembly cable properly
1
installed at system board JOPP1 and at the
operator panel assembly?
Measure the voltage between JOPP1 pin 2
2
and ground on the system board.
Is the voltage approximately +5 V dc?
Check continuity of the operator panel
3
assembly cable.
Is there continuity?
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.
Step Questions / actions
Check for ground between JOPP1 pin 4 and
1
ground.
Is the voltage approximately 0 V dc?
Check the operator panel assembly cable.
2
Is the cable damaged?
Operator panel display all diamonds, no beeps
Step Questions / actions
Check the operator panel assembly cable.
1
Is the cable damaged?
Measure the voltage between JOPP1 pin 2
2
and ground on the system board.
Is the voltage approximately +5 V dc?
Service Manual
2-150
Yes
Go to step 2.
Go to step 3.
Replace the operator panel
assembly. See
"Operator
panel assembly removal"
on page 4-26.
Yes
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.
Yes
Replace the top access
cover assembly. See
"Top
access cover assembly
removal" on page 4-43.
Replace the operator panel
assembly. See
"Operator
panel assembly removal"
on page 4-26.
No
Reinstall the cable.
Replace the system board.
See
"System board
removal" on page 4-165.
Replace the top cover
access assembly. See
"Top access cover
assembly removal" on
page 4-43.
No
Go to step 2.
Replace the system board.
See
"System board
removal" on page 4-165.
No
Go to step 2.
Replace the system board.
See
"System board
removal" on page 4-165.
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