Printronix L1024, Maintenance Manual

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13–29 Chapter 13 – Troubleshooting Guide
01 CLOSE THE COVER
1. The printer top cover is open.
a. Make sure the top cover is closed, especially the right side.
b. The right clamshell latch is broken and is not tripping the interlock switch on the
L.V.P.S. If the latch is broken, make sure the drive belt cover is installed properly.
When the drive belt cover is not seated correctly, the clamshell latch will catch and
break as it goes through the hole in the cover.
2. The top cover interlock switch is defective.
a. The interlock switch on the L.V.P.S. is not functioning correctly. The switch must be
replaced on the L.V.P.S.
b. The L.V.P.S. is not supplying the 12 V to the switch and must be replaced.
c. The Engine Controller Board is not interpreting the cover open signal correctly and
must be replaced.
d. Check the wire harness from the power supply to the Engine Controller Board and
replace the harness if necessary.
e. The Data Controller Board is defective and must be replaced.
02 LOAD PAPER
1. There is no paper on the input side of the printer.
a. Make sure that there is paper in the printer.
b. Make sure that the paper has been fed between the upper and lower paper rollers. The
paper must depress the Paper Empty sensor lever.
2. The paper empty sensor is defective.
a. Make sure that the sensor lever is not broken or bent; replace it if needed.
b. Check the paper empty sensor board for toner or paper dust buildup and clean it if
needed.
c. The paper empty optical sensor is defective. Replace the paper empty sensor board.
d. The Engine Controller Board is faulty and must be replaced.
e. The cable for the paper sensor board is faulty and must be replaced.
f. The L.V.P.S. is faulty and must be replaced.
NOTE: A faulty L.V.P.S. would be unlikely, as there would be numerous other
problems with the printer. The paper sensor board uses 5 V, as well as the
Engine Controller Board. If the 5 V were not present, the Engine Controller
Board and the printer could not function.