Lexmark W850n Manual page 106

4024-110
Step Check
3 Check the sensor (punch unit side reg2) for correct
operation.
Perform the sensor (punch unit side reg2) test.
1. Enter Diagnostics mode.
2. Select FINISHER TESTS.
3. Select Sensor Tests.
4. Select Punch and Staple.
5. Select Punch side reg2.
Open the finisher front door.
Insert a fragment of a sheet of white media under the
sensor (punch unit side reg2).
Does the display on the operator panel change every
time a piece of white media is placed over the sensing
area of the sensor (punch unit side reg2)?
4 Check the appropriate sensor (punch unit side reg)
connection.
Is the above sensor connected properly?
5 Open the finisher front door assembly.
Manually push the punch carriage toward the rear of
the finisher.
Check the punch carriage shift motor assembly by
opening and closing the finisher front door. The punch
carriage should move slightly.
Does the punch carriage shift motor assembly rotate,
and does the punch shift carriage move back and
forth?
6 Is the punch carriage shift motor assembly connected
properly?
7 Perform a test print.
Does the error still occur?
2-84
Finisher Service Manual
Yes No
Go to step 5. Go to step 4.
Replace the Replace the
appropriate connection.
sensor (punch
unit side reg). Go
to "Sensor
(punch unit side
registration
pair) with
bracket
removal" on
page 4-44.
Go to step 7. Go to step 6.
Replace the Replace the
punch carriage connection.
shift motor
assembly. Go to
"Punch carriage
shift motor
assembly
removal" on
page 4-43.
Replace the Problem solved.
printer engine
card assembly.
Refer to the
Printer Service
Manual.