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.
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