Printronix L1024 Maintenance Manual page 291

d. Replace the paper brush if the above steps do not remedy the problem.
e. The Engine Controller Board has been damaged by static and must be replaced.
f. The laser has been damaged and the LSU must be replaced.
522. The static brush on the transfer charger has been damaged and is causing static
discharges to the laser.
a. Check to make sure the brush is not damaged and is in good physical contact with the
transfer charger frame.
Follow these steps if the entire page has black print or the above steps did not fix the problem
on pages with intermittent black areas:
523. The OPC drum charge is intermittent on pages of partial black print, or is not present on
pages with all black print.
a. Check the contact between the H.V.P.S. and the OPC drum. Make sure there is no
corrosion and that the H.V.P.S. contact spring is not compressed. Pull the spring to
lengthen it if necessary. Make sure to pull the spring upward, not at an angle.
b. The OPC drum is not holding a charge, and the OPC drum unit must be replaced.
c. The H.V.P.S. is not supplying the proper OPC drum charge. Adjust the H.V.P.S. drum
charge according to the procedure in Chapter 8, Power Supplies . If there is no charge
or the proper charge cannot be obtained, replace the H.V.P.S.
d. The L.V.P.S. is not supplying the correct voltage to the H.V.P.S. and must be replaced.
e. The Engine Controller Board is not turning on the power supplies at the proper time
and must be replaced.
f. The laser in the LSU is defective and the LSU must be replaced.
524. The H.V.P.S. is supplying intermittent voltages to the OPC drum. This usually results in
pages with intermittent black areas on them.
a. The H.V.P.S. is beginning to fail and must be replaced.
530. Dirty background in unprinted areas.
531. The developer sleeve is not receiving the correct voltage.
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 power supply if the correct voltage cannot be obtained.
532. The OPC drum is not holding a charge.
a. The drum has been worn out and the OPC drum unit must be replaced.
533. The H.V.P.S. voltage for the OPC drum is incorrect.
Chapter 13 – Troubleshooting Guide 13–19