2-78 Service Manual
5021-0XX
Incorrect media 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
DCN16?
Go to step 2. Properly connect
cable.
2 Reconnect operator panel.
Turn printer on. Touch
negative lead of voltmeter
to metal bracket that holds
I/O board to obtain ground.
Touch positive lead to
DCN16 pin 10 to ensure 5
VDC is being supplied to
toner present sensor. Is 5
VDC present?
Go to step 3. Go to step 6.
3 Remove tray from printer.
Remove paper from tray
and insert 1 sheet of
transparency. Insert paper
tray into printer. Check
voltage level on DCN16 pin
11. Voltage should
measure approximately 4.6
VDC. Is voltage okay?
Go to step 4. Go to step 5.
4 Remove tray from printer.
Remove transparency from
tray and insert white paper.
Insert paper tray into
printer. Check voltage level
on DCN16 pin 11. Voltage
should measure
approximately 1.7 VDC. Is
voltage okay?
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.
Go to step 5.
