Lexmark 5021-0XX User Manual
Page 160

2-82
Service Manual
5021-0XX
6
Push toner cartridge fully
in. Check voltage level on
DCN2 pin 1. Is 0 VDC
present?
Replace I/O
board. See
problem
persists, replace
engine controller
board. See
“Engine
controller
board removal”
on page 4-55
Replace toner
present sensor.
See
present sensor
removal” on
page 4-63
7
Turn printer off. Check
cable for continuity that
connects DCN2 pins 1, 2,
and 3 to toner present
sensor. Also check for
shorted pins. Is cable
okay?
Replace toner
present sensor.
See
present sensor
removal” on
page 4-63
Replace cable.
8
Touch positive lead to
DCN13 pin 9 to ensure 5
VDC is being supplied to I/
O board. Also check pin 11
for 5 VDC. Is 5 VDC
present?
Replace I/O
board. See
Go to step 9.
9
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.
Step
Questions / actions
Yes
No