Encoder Fail-Call Service - Printronix L1024 Maintenance Manual

c. Check the Speed Control Paper Guide Sensor.
d. See the "General Paper Jam Troubleshooting" section that follows.
25 ENCODER FAIL—Call Service
1. The tractor encoder signal is faulty.
a. Clean any toner or paper dust out of the encoder sensor.
b. Inspect the tractor encoder wheel for damage. Replace it if necessary.
c. The encoder sensor is faulty. Replace the tractor encoder board or the entire tractor
unit.
d. The fuser drive clutch is slipping; replace it.
e. Replace the Engine Controller Board.
f. Replace the encoder cable.
g. See the "General Paper Jam Troubleshooting" section that follows.
General Paper Jam Troubleshooting
Paper jam errors can come from a number of different sources. The way in which the paper jam error
occurs is a very useful tool in determining what component is causing the error. For instance, how the
printer reacts during the top-of-form (TOF) reset will help indicate what component is at fault. If a paper
jam error occurs immediately, before the paper moves, the paper jam sensor in the fuser heat shield is
most likely at fault. If the jam occurs after the paper moves about 1/2 inch, the tractor encoder may be at
fault.
1. Visible paper jam.
This section deals with errors where there is a real paper jam—that is, where error messages
are being displayed and a paper jam is visible. If error messages are being displayed but there
is no visible paper jam, see the section on page 13–34.
When a jam occurs, the paper will start buckling or bunching until it strikes the paper jam
sensor in the fuser heat shield. The paper usually becomes compressed like an accordion.
a. The paper jams as it exits the fuser and printer.
b. The paper jams as it enters the fuser.
13–32
1) Carefully clear the jam so that none of the fuser components become
damaged. The separator springs in the fuser rear cover can be bent or
damaged easily if the jammed paper is not carefully removed.
2) If the jam reoccurs, check the separator springs for damage and replace parts
as needed.
3) Check the other components of the fuser rear cover for damage and replace
parts as needed.
4) The paper is adhering to one of the rollers, causing the jam. Replace the entire
fuser unit.
5) Make sure the exiting paper has room to stack as it exits the printer.
1) Carefully clear the jam, making sure that the plastic top-of-form (TOF) lever
(flag assembly) does not become damaged.
a) Check the TOF lever to make sure it moves freely. If it is not moving
freely, check to see if it is binding on the edge of the hole in the fuser
Chapter 13 – Troubleshooting Guide