Lexmark W840 Finisher Service Manual page 99

Step Check
3 Check the sensor (punch unit side reg2) for correct
operation.
Perform the Punch 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.
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 Check the punch carriage shift motor assembly by
moving the punch carriage forward, then opening 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?
Yes No
Go to step 5. Go to step 4.
Replace the Replace the
appropriate connection.
sensor (punch
unit side reg).
See "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. See
"Punch carriage
shift motor
assembly
removal" on
page 4-43.
Replace the Problem solved.
printer engine
card assembly.
Refer to the
Printer Service
Manual.
Diagnostic information
4024-XXX
2-77