Table 6-7 Error Code F4-21 - Xerox DOCUPRINT N4525 Service Quick Reference Manual

Table 6-7 Error Code F4-21 (cont'd.)
Step Actions and Questions
6 DRIVE TRAIN TEST
1. Enter Diagnostics Mode.
2. From the Main Menu, select Comp output Test /
Finisher Unit / Fin Main Motor.
3. Press [4] to start, [0] to stop.
4. Observe the Main Motor for operation.
Does the Finisher Main Motor run smoothly?
7 DRIVE TRAIN INSPECTION
Inspect the drive train, including belts, pulleys, and gears
of the entire Finisher Assembly from the Finisher Main
Feed Motor to the Registration Rollers.
Does the entire drive train of the Finisher
Assembly appear to be in good condition, with
no damaged or slipping belts and no chipped
or broken pulleys or gears?
8 The following Finisher components and areas are
associated with this specific problem. One or more of
these components or areas may have failed partially or
completely. If you cannot isolate this problem using the
steps in this Repair Analysis Procedure, replace each
component or troubleshoot each area listed below, one at
a time, until you isolate and solve the problem.
Horizontal Transport Exit Sensor (RRP 6-12)


Finisher Main Board (RRP 6-84)


Print Engine Controller Board (RRP 1-72)


Wiring and connectors linking the components.


6-662 DocuPrint N4525 Network Laser Printer - Service Guide
Yes No
Go to step 7 Replace the
Finisher Main
Motor (RRP
6-38) &
retest. If still
NO, go to
step 7.
go to step 8 Replace all
suspect belts,
pulleys, gears
& retest. If
still NO, go to
step 8.