Diagnostic information 2-53
5022-xxx
Operator panel service check
Warning: When replacing any one of the following components:
• Operator panel assembly
• System card
• Printhead assembly
Only replace one component at a time. Replace the required component, and perform a POR before
replacing a second component listed above. If this procedure is not followed, the printer will be
rendered inoperable.
Warning: Never install and remove components listed above as a method of troubleshooting
components. Once a component has been installed in a printer, it cannot be used in another
printer. It must be returned to the manufacturer.
One or more operator panel buttons fail
Operator panel display blank, five beeps, and LED off
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 Yes No
1 Run the Button Test. See “Button Test” on
page 3-11 in Diagnostics mode.
Did any of the buttons fail the test?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-23.
Go to step 2.
2
Disconnect the operator panel assembly cable
from JOPP1 on the system card, and measure
the voltage on pin 6 and ground.
Does the voltage measure approximately
+3.3 V dc?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-23. If this does
not fix the problem, 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 Is the operator panel assembly cable properly
installed at system card 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 card.
Is the voltage approximately +5 V dc?
Go to step 3. Replace the system card.
See “System card
removal” on page 4-79.
3
Check continuity of the operator panel
assembly cable.
Is there continuity?
Replace the operator panel
assembly. See “Operator
panel assembly removal”
on page 4-23.
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.
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