Printronix L1024, Maintenance Manual

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13–20 Chapter 13 – Troubleshooting Guide
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. Adjust the drum voltage via the procedure in Chapter 8, Power Supplies.
c. Replace the H.V.P.S. if the correct voltage cannot be obtained.
534. The print density is set too high on the H.V.P.S.
a. Turn the green density knob on the H.V.P.S. down to a level where the background is
no longer dirty.
b. If the problem persist after adjusting the green knob, the power supply must be
readjusted according to the procedure in Chapter 8, Power Supplies.
c. The H.V.P.S. must be replaced if the proper voltage cannot be obtained.
535. The doctor blade gap of the developer unit is too large. If this is the cause, the dirty
background will disappear as soon as a new developer unit is installed.
a. Replace the developer unit.
540. Black or white concentric rings.
These look like ripples caused in a pond by a stone being thrown into it.
541. The transfer charger static brush is damaged. It is not removing the residual charge from
the paper after the toner transfer process. This causes static discharges to occur on the
paper before the toner is fused. The static discharges scatter the toner.
a. Replace the transfer charger static brush.
550. The printed image is weak, barely visible.
551. The developer unit is low on toner.
a. Install a new toner cartridge onto the developer unit.
552. The green density knob on the H.V.P.S. is set too low.
a. The power supply is not supplying enough voltage to the developer sleeve. Turn the
knob to a higher setting.
553. The transfer charger is not rising into position.
a. Make sure the engagement lever is not binding on the transfer charger. Make sure the
lever moves freely.
b. Make sure the engagement lever roller is properly seated on the engagement cam
lever of the fuser.
c. The transfer solenoid is not engaging correctly. Check to make sure the signal to
release the solenoid is being sent from the L.V.P.S.
1. If the signal is present, replace the transfer solenoid.
2. If there is no signal, replace the L.V.P.S.