Lexmark X746de Service Manual page 189

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?
Black display, stripes display, and distorted display
Step Questions / actions
1. Turn off the printer.
1
2. Open the rear cover.
3. Reseat the UICC cable (J2) on the system
board.
4. Check the J2 connector on the system
board for any damage.
Is the connector damaged?
1. Turn off the printer.
2
2. Disconnect the J2 UICC cable.
3. Connect a new top access cover
assembly from outside of the machine for
verification.
Does the problem persist?
Yes
Go to step 2.
Go to step 3.
Replace the operator panel
assembly. See
"Operator
panel assembly removal"
on page 4-27.
Yes
Replace the operator panel
assembly. See
"Operator
panel assembly removal"
on page 4-27.
Replace the top cover
access assembly. See
"Top access cover
assembly removal" on
page 4-40.
Yes
Replace the system board.
See
"System board
removal" on page 4-157.
Return to the od top access
cover assembly, then go to
step 6.
7526
No
Reinstall the cable.
Replace the system board.
See
"System board
removal" on page 4-157.
Replace the top cover
access assembly. See
"Top access cover
assembly removal" on
page 4-40.
No
Go to step 2.
Replace the system board.
See
"System board
removal" on page 4-157.
No
Go to step 2.
Return to the old top
access cover assembly,
then go to step 3.
Diagnostic information
2-149
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