2-54 Service Manual
5022-xxx
Operator panel display blank, five beeps, LED on
Service tip: The printer has detected a problem with the system card, 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 sticks in a continuous pattern until the printer is turned off.
Operator panel display all diamonds, no beeps
Operator panel display all diamonds, five beeps
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 4-23.
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—model C52x
only” on page 4-28 or “Top
access cover assembly
removal—model C53x
only” on page 4-32.
Replace the system card.
See “System card
removal” on page 4-79.
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—model C52x
only” on page 4-28 or “Top
access cover assembly
removal—model C53x
only” on page 4-32.
Go to step 2.
2
Measure the voltage between JOPP1 pin 2
and ground on the system card.
Is the voltage approximately +5 V dc?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-23.
Replace the system card.
See “System card
removal” on page 4-79.
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—model C52x
only” on page 4-28 or “Top
access cover assembly
removal—model C53x
only” on page 4-32.
Go to step 2.
2
Measure the voltage between JOPP1 pin 2
and ground on the system card.
Is the voltage approximately +5 V dc?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-23.
Replace the system card.
See “System card
removal” on page 4-79.
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