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Toner low/empty service check, Toner low/empty – Lexmark 5021-0XX User Manual

Page 170

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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

.