Lexmark W820 Service Manual page 110

Step Actions and Questions
4 MAILBOX MOTOR TEST
Enter Diagnostic Mode - Output Bin Feed Test.
Select single bin to feed one sheet of paper to one bin.
Does the Mailbox Motor run?
5 DRIVE BELT INSPECTION
While the Drive Motor is running, inspect the Drive Belt.
Does the Drive Belt run smoothly, without stalling or
slipping?
6 MAILBOX EXIT ROLL INSPECTION
While the Drive Motor is running, inspect the Mailbox Exit
Rolls.
Do the Exit Rolls run smoothly, without stalling or
slipping, and are they clean and free from wear?
7 PINCH ROLL INSPECTION
Open the Transport Guide Assembly and inspect, rotate, push
down and release each individual Pinch Roll.
Are the Pinch Rolls clean and free from wear, do they
rotate freely, and do they have a spring-action return?
8 BIN GATE SOLENOID TEST
Enter Diagnostic Mode - Output Bin, Feed to all Bins.
Paper should feed into each Mailbox bin
Does paper feed into each Mailbox bin and does the Bin
Gate lay flat?
9 MAILBOX CONTROL PWB REPLACEMENT
Replace the
Does the error code appear?
10 MCU PWB REPLACEMENT
Replace the printer Engine Board (MCU PWB). Go to the
printer service manual for the Removal and Replacement
Procedure.
Does the error code appear?
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, one at a time, until you isolate
and solve the problem.
• Wiring and connectors linking the FRUs
2-28
Service Manual
"Mailbox Control PWB" on page
4025 Options
4-44.
Yes No
Go to step 5 Go to step 9
Go to step 6 Replace the
"Mailbox
Drive Belt"
on page 4-32
Go to step 7 Replace the
problem
"Mailbox Exit
Roll and Bin
Gate" on
page 4-38
Go to step 8 Replace the
"Transport
Guide
Assembly"
on page 4-54
Go to step 9 Replace the
problem Bin
Solenoid. Go
to "Gate
Solenoids 1 -
9" on
page 4-36.
Go to step 10 Problem
solved
Go to step 11 Problem
solved