Paper size sensing service check, Paper size sensing – Lexmark 5021-0XX User Manual
Page 165

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