Printronix L1024, Maintenance Manual

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13–18 Chapter 13 – Troubleshooting Guide
d. If there is no charge after step c, check all wire harnesses.
516. The developer contact spring has the proper charge on it.
a. Make sure there is good contact between the spring and the developer unit. Clean off
all corrosion on the spring and on the contact. Lengthen the spring, if compressed, by
pulling it. Make sure to pull the spring upward, not at an angle.
b. Make sure the developer unit has toner in it.
c. The developer unit is defective and must be replaced.
517. The LSU is not aligned properly and the laser beam is not exiting from the LSU cover
glass. (If the laser itself were not working, a “BEAM DET FAIL” error or an “LSU FAIL”
error would occur.) The LSU could become misaligned if the printer were dropped or
severely jarred. This would be a very rare instance.
a. Replace the LSU.
Follow the next step if there is print on the page with the engine self-test, but not when printing
from the host computer:
518. The host computer is not properly connected to the printer, or is not properly configured
for the printer.
a. Verify the cabling from the printer to the computer.
b. Verify the software configuration for the printer.
Follow the next step if there is no print when running a self-test from the Control Panel or if a
print job does not print from the computer. The engine self-test works properly, and step 518
has been completed.
519. The Data Controller Board is not functioning properly.
a. Replace the Data Controller Board.
520. Full or partial black page.
Partial areas of black on a page usually indicate static discharges. Check any source of
static along the paper path, as this is the most common source of static in the printer. Full
pages of black print usually indicate a missing charge voltage or a damaged laser.
Follow these steps when the page is partially covered with black print:
521. The paper brush is not properly grounded, causing a static discharge to turn on the
laser continuously. This may result in black print on any portion of the page.
a. Make sure the paper brush is properly seated into position. The grounding spring must
make good physical contact with the printer base pan. Remove the paper brush and
see if the error still occurs. Replace the brush if the lines are not present with the
brush removed.
b. Make sure the grounding spring on the paper brush is not corroded or bent. Replace it
if necessary.
c. Make sure the grounding spring is making good contact with the roller shafts of the
paper brush. Use conductive grease if necessary to insure good contact.