Printronix L5000 Series Maintenance Manual page 351

5. Check the I/O board.
a. Remove the drive belt between the drum and the drum cleaner.
b. Put the positive lead of the digital multimeter on TP9 (IC16/TC9142P–8) on
c. Turn the power ON.
d. Measure the voltage, which should be 4 1V during drum motor operation.
e. Put the positive lead of the digital multimeter on pin 1 of IC15 (LM324) on
f.
If the voltage is not normal, replace the I/O board.
Troubleshooting
the I/O board, and the negative lead on the SG.
the I/O board, and the negative lead on the PG.
Measure the voltage, which should be about 12V during drum motor
operation.
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