Lexmark C520 Service Manual - Page 69

Operator panel display blank, five, LED on, Operator panel display all diamonds, no, Operator panel

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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. Step Questions / actions 1 Check for ground between JOPP1 pin 4 and ground. Is the voltage approximately 0 V dc? 2 Check the operator panel assembly cable. Is the cable damaged? Yes No Replace the operator panel assembly. See "Operator panel assembly removal" on page 4-23. 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. Go to step 2. Replace the system card. See "System card removal" on page 4-79. Operator panel display all diamonds, no beeps Step Questions / actions 1 Check the operator panel assembly cable. Is the cable damaged? 2 Measure the voltage between JOPP1 pin 2 and ground on the system card. Is the voltage approximately +5 V dc? Yes No 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. Replace the operator panel assembly. See "Operator panel assembly removal" on page 4-23. Go to step 2. Replace the system card. See "System card removal" on page 4-79. Operator panel display all diamonds, five beeps Step Questions / actions 1 Check the operator panel assembly cable. Is the cable damaged? 2 Measure the voltage between JOPP1 pin 2 and ground on the system card. Is the voltage approximately +5 V dc? Yes No 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. 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. 2-54 Service Manual

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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
.