Blank, Erratic, Or Inoperative Operator Panel Service Check - Lexmark W812 Service Manual

4022-XXX
Step Actions and Questions
5 AC POWER CORD REPLACEMENT
Replace the AC Power Cord.
Monitor printer operation.
Does the printer display erratic operation?
6 RIP CARD ASSEMBLY REPLACEMENT
Replace the RIP Card Assembly with a new one.
Monitor printer operation.
Does the printer display erratic operation?
7 ENGINE CARD ASSEMBLY REPLACEMENT
Replace the Engine Card Assembly.
Monitor printer operation.
Does the printer display erratic operation?
8 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Toner Cartridge
• Wiring and connectors linking the FRUs
• Interlock switches and circuits
• LVPS or HVPS
• Computer Interface Cable
• Operator Panel

Blank, Erratic, or Inoperative Operator Panel Service Check

The Operator Panel LCD is blank or displays garbled text, or the Operator Panel keypad
does not respond to user input.
Step Actions and Questions
1 PRINTER STATUS TEST
Switch on printer power and wait 2 minutes for warm-up to
complete.
Use any application on the host computer to generate a few
prints.
Does the printer generate prints?
2 OPERATOR PANEL TEST
Enter Diagnostic Mode.
Does the display indicate diagnostic mode?
2-16
Service Manual
Yes No
Go to step 6 Problem
solved
Go to step 7 Problem
solved
Go to step 8 Problem
solved
Yes No
Go to step 2 Go to
"Inoperative
Printer
Service
Check" on
page 2-14.
Go to step 3 Replace the
Operator
Panel