Lexmark W850 - Sensor (Stapler Carriage HP) off Failure

2-86 Finisher Service Manual
4024-XXX
990.01 Sensor (stapler carriage HP) off failure
4 Check the stapler carriage motor assembly by opening
the finisher front door assembly then pushing the
stapler carriage towards the back. Then closing the
finisher front door assembly, the stapler carriage
should move.
Does the stapler carriage motor assembly rotate
normally?
Go to step 6. Go to step 5.
5 Is the stapler carriage motor assembly connected
properly?
Replace the
stapler carriage
motor assembly.
Replace the
connection
6 Perform a test print stapled document.
Does the error still occur?
Replace the
printer engine
card assembly.
Refer to the
Printer Service
Manual.
Problem solved.
Step Check Yes No
1 Check the stapler by moving it with your fingers.
Does the Stapler carriage move smoothly?
Go to step 2. Remove
obstructions.
2 Check the sensor (stapler carriage HP) for correct
operation.
Perform the sensor (stapler carriage HP) test.
1. Enter Diagnostics mode.
2. Select FINISHER TESTS.
3. Select Sensor Tests.
4. Select Punch and Staple.
5. Select Stapler carriage shift HP.
Does the display on the operator panel change every
time the sensing area of the sensor (stapler carriage
HP) is placed to the interrupt flag of the stapler rack
gear by moving the stapler carriage by hand?
Go to step 4. Go to step 3.
3 Is the sensor (stapler carriage HP) connected
properly?
Replace the
sensor (stapler
carriage HP). Go
to “Sensor
(stapler carriage
HP) removal” on
page 4-58.
Replace the
connection.
4 Check the stapler carriage motor assembly by opening
the finisher front door assembly then pushing the
stapler carriage towards the back. Then closing the
finisher front door assembly, the stapler carriage
should move.
Does the stapler carriage motor assembly rotate
normally?
Go to step 6. Go to step 5.
5 Is the stapler carriage motor assembly connected
properly?
Replace the
stapler carriage
motor assembly.
Replace the
connection.
Step Check Yes No