Printronix L1024, Maintenance Manual

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13–24 Chapter 13 – Troubleshooting Guide
a. There is a visible toner buildup on the OPC drum. Because the drum surface is coated
with photosensitive material, it is impractical to clean it. Replace the OPC drum unit.
b. The drum no longer holds a charge and is therefore not being cleaned correctly.
Replace the OPC drum unit.
635. The fuser roller has excessive toner buildup or is worn out.
a. Occasionally, the fuser wiper becomes saturated with toner and does not clean the
fuser roller correctly. Toner builds up on the roller and then becomes burned onto it.
Replace the roller or fuser.
636. The developer sleeve is not receiving the correct voltage. The ghosting is accompanied
by a dirty background in areas that should be white.
a. The contact between the developer sleeve and the contact spring from the H.V.P.S. is
faulty. Check for corrosion and a compressed spring. The contact may also be faulty
inside the developer unit itself. Replace the developer unit if the problem cannot be
corrected.
b. The H.V.P.S. is not supplying the correct voltage. Adjust it according to the procedure
in Chapter 8,
Power Supplies.
c. Replace the H.V.P.S. if the correct voltage cannot be obtained.
640. Intermittent black patches.
641. The H.V.P.S. is supplying intermittent voltages to the OPC drum. This usually results in
pages with intermittent black areas on them during the first 3 pages of a print job.
a. The H.V.P.S. is beginning to fail and must be replaced.
642. The paper is dry and has static buildup.
a. In areas of very low humidity, the paper dries out and picks up excessive static charge
from the voltages in the printer. The paper must be stored at over 30% humidity in
order to avoid problems with excessive static buildup.
b. The plastic paper guide on the transfer charger can be replaced by one that is
conductive. These are available on an as-needed basis only. This is a very rare
occurrence.
c. The paper is defective and must be replaced. This is also very rare.
650. Black spots on white print or white spots on black print.
These spots occur at random, and cover the entire page. It looks as if the page has a case of
the measles.
651. The paper is dry and has static buildup.
a. In areas of very low humidity, the paper dries out and picks up excessive static charge
from the voltages in the printer. The paper must be stored at over 30% humidity in
order to avoid problems with static buildup.
b. The plastic paper guide on the transfer charger can be replaced by one that is
conductive. These are available on an as-needed basis only. This is a very rare
occurrence.