Sensor (Punch Unit Hp) Off Failure - Lexmark X850e Service Manual

7500-XXX
Step Check
4 Check the punch unit motor for proper operation.
Perform the punch unit motor test.
Remove the rear upper cover. Go to
cover removal" on page
1. Enter the Diagnostic Menu.
2. Touch FINISHER TESTS.
3. Touch Punch unit mtr.
4. Touch Forward or Reverse.
Open and override the finisher front door interlock
switch.
Does the punch unit motor operate properly, that is,
does the punch cam (rack gear) move forward and
reverse?
5 Are the punch unit motor and punch drive cable
assembly connected properly?
6 Perform a print test.
Does the error still occur?

984.01 Sensor (punch unit HP) off failure

Step Check
1 Check the punch unit by moving it with your fingers.
Does the punch unit move smoothly?
2 Check the sensor (punch unit HP) for proper operation.
Perform the sensor (punch unit HP) test.
Remove the rear upper cover. Go to Go to
upper cover removal" on page
1. Enter the Diagnostics Menu.
2. Touch FINISHER TESTS.
3. Touch Sensor Test.
4. Touch Punch and Staple.
5. Touch Punch unit HP.
Move the rack gear in the punch unit assembly
manually by hand.
Does the operator panel display change every time the
sensing area of the sensor (punch unit HP) is blocked?
2-130
Options Service Manual
"Rear upper
4-101.
"Rear
4-101.
Yes No
Go to step 6. Go to step 5.
Replace the Replace the
punch unit motor. connection.
Go to "Punch
unit motor
assembly
removal" on
page 4-124.
Replace the Problem solved.
finisher controller
card assembly.
"Finisher
Go to
controller card
assembly
removal" on
page 4-195.
Yes No
Go to step 2. Remove
obstructions.
Go to step 4. Go to step 3.