Printronix L1024, Maintenance Manual

Page: 284 / 372

13–12 Chapter 13 – Troubleshooting Guide
a. Check and clean the charge corona wire and grid.
b. Make sure the contact between the OPC drum unit and the contact spring for the
charge corona is good.
1. Clean any corrosion from the contact and the spring.
2. Stretch the spring by pulling the end of it if the spring is compressed and the
contact is still poor. Make sure to pull the spring upward, not at an angle.
c. Check the charge current from the H.V.P.S. according to the procedure in Chapter 8,
Power Supplies, and adjust the H.V.P.S. if necessary.
1. Replace H.V.P.S. if the charge current cannot be adjusted correctly.
240. Black or white line (sharp well defined edges).
241. The OPC drum has been scratched. This scratch will extend around the circumference of
the drum.
a. Replace the OPC drum unit.
242. The OPC drum has an area of poor electrical characteristics and it must be replaced.
a. Replace the OPC drum unit.
243. There is a scratch or toner buildup around the circumference of the fuser roller.
a. Replace the fuser roller.
250. Wide black line (indistinct edges).
This line is not present when the laser beam is blocked at the cover glass.
251. Verify that the Engine Controller Board is set to the correct resolution.
a. Check jumper J1 on the Engine Controller Board to verify correct resolution. It should
be present for 240 dpi operation and should be removed for 300 dpi operation.
252. The LSU is out of alignment and the laser beam is reflecting from a surface it should not
be striking. This is occurring inside the LSU.
a. Replace the LSU.
53. The laser is being turned on too soon or turned off too late. This causes reflections inside
the LSU that strike the OPC drum.
a. Replace the Engine Controller Board.
b. Replace the LSU.
260. Distorted or blurred image running the length of the page.
261. There is something on the LSU cover glass that is causing the laser beam to be distorted.
a. Clean the cover glass and replace it if necessary.
262. There is something on the optics inside the LSU.