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 “I/O
board removal”
on page 4-70. If
problem
persists, replace
engine controller
board. See
“Engine
controller
board removal”
on page 4-55.
Replace toner
present sensor.
See “Toner
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 “Toner
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 “I/O
board removal”
on page 4-70.
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 “Low
voltage power
supply (LVPS)
with cage
removal” on
page 4-60.
Replace cable.
Step Questions / actions Yes No
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