Lexmark W820 Service Manual page 153

Step Actions and Questions
4 SOFTWARE RELOAD
Reload print driver software.
Monitor printer operation.
Does the printer display erratic operation?
5 AC POWER CORD REPLACEMENT
Replace the AC Power Cord.
Monitor printer operation.
Does the printer display erratic operation?
6 ESS PWB REPLACEMENT
Replace the "Controller Board (ESS PWB)" on page 4-94
with a new one.
Monitor printer operation.
Does the printer display erratic operation?
8 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page
Monitor printer operation.
Does the printer display erratic operation?
9 I/O PWB REPLACEMENT
Replace the "I/O PWB" on page
Monitor printer operation.
Does the printer display erratic operation?
10 ELECTRICAL NOISE CHECK
Go to "Electrical Interference" on page 2-78
troubleshoot for a possible internal or external interference
problem.
After you finish, return to this step and monitor printer
operation.
Does the printer display erratic operation?
11 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.
• Wiring and connectors linking the FRUs
• Interlock switches and circuits
• Xerographic FRUs and HVPS - Go to
Supply (HVPS) Assembly" on page
• Computer Interface Cable
• Operator Panel - Go to
• AC Driver PWB - Go to
page 4-86.
4025-XXX
4-89.
and
"High Voltage Power
4-88.
"Operator Panel" on page
"AC Driver PWB 120/230 VAC" on
Yes
Go to step 5
Go to step 6
Go to step 7
Go to step 9
4-92.
Go to step 10
Go to step 11
4-11.
Diagnostic Information
No
Problem
solved
Problem
solved
Problem
solved
Problem
solved
Problem
solved
Problem
solved
2-57