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Paper size sensing service check, Paper size sensing – Lexmark 5021-0XX User Manual

Page 165

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Diagnostic information

2-87

5021-0XX

Paper size sensing service check

Step

Questions / actions

Yes

No

1

Turn printer off and remove
I/O board shield. See

“I/O

board removal” on
page 4-70

for steps to

remove I/O board shield. Is
cable properly connected
to I/O board connector
DCN19?

Go to step 2.

Properly connect
cable.

2

Reconnect operator panel.
Turn printer on and check
for 5 VDC between DCN19
pin 1 and ground (you can
touch negative lead of
voltmeter to metal bracket
that holds I/O board to
obtain ground.) Is 5 VDC
present?

Go to step 5.

Go to step 3.

3

Disconnect cable from
DCN13 on I/O board. On
cable that connects to
DCN13, check for 5 VDC
between pins 11 and 12. Is
5 VDC present?

Replace I/O
board. See

“I/O

board removal”
on page 4-70

.

Go to step 4.

4

Check cable continuity
between LVPS ACN1 and I/
O board DCN13. Also
check for shorted pins. Is
cable okay?

Replace LVPS.
See

“Low

voltage power
supply (LVPS)
with cage
removal” on
page 4-60

.

Replace cable.