Front Cover Open - Printronix L5000 Series Maintenance Manual

01 – Front Cover Open
1. Ensure that the front cover is properly closed. If necessary, close the cover and
press the CLEAR key to clear the fault. If the fault still exists, go to Step 2.
2. Check the front cover interlock switch (Reed switch / CIL).
a. Power OFF the printer at the breaker, and unplug the power cord from the
b. Remove the cover on the DC Power Supply.
c. Remove CN9 on the DC Power Supply board.
d. Measure the resistance between pin 2 and pin 3 of CN9 with the digital
If resistance is 0Ω (normal), go to Step 3. Otherwise, replace the interlock switch
after checking the wire harness.
3. Check the DC Power Supply.
a. Connect the positive lead of the digital multimeter on pin 2 (blue wire) of
b. Plug the power cord into the wall outlet, and power ON the printer.
c. Measure the DC voltage. If it is not –24V, replace the DC Power Supply
Troubleshooting
CHECKLIST: FRONT COVER
FRONT COVER INTERLOCK SWITCH
DC POWER SUPPLY BOARD
wall outlet.
multimeter.
CN31 on the I/O board, and the negative lead on pin 3 (black wire).
board.
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