2-92 Service Manual
5021-0XX
Toner low/empty 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
DCN15?
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
DCN15 pin 1, 2, 3, or 4 for
specific color as dictated by
list below:
DCN15
pin1—black(K)
pin2—yellow(Y)
pin3—magenta(M)
pin4—cyan(C)
Slightly remove toner
cartridge in question.
Voltmeter should read
approximately 4.8 VDC.
Continue to slowly slide
toner cartridge out of
printer while noting
voltmeter reading. Voltage
should slowly decrease
until it reads approximately
0 VDC. Is toner sensor
system working properly?
Go to step 3. Check cable for
continuity
between I/O
board DCN15
and toner sensor
system (both
sender and
receiver). Also
check for
shorted pins.
See “Toner
sensor (sender)
removal” on
page 4-35 and
“Toner sensor
(receiver)
removal” on
page 4-64 for
steps to expose
cable. If cable is
okay, replace
toner sensor
system.
3 Replace I/O board.
See “I/O board removal”
on page 4-70. Does error
clear?
Problem solved. Replace engine
controller board.
See “Engine
controller
board removal”
on page 4-55.
