Printronix L5000 Series Maintenance Manual page 359

4. Check the flash power unit.
a. Connect the jack to CN11 of the flash power unit.
b. Put the positive lead of the digital multimeter on pin 3 of IC23 on the MPU
c. Place the rotary switch on the MPU board in position "E".
d. Turn the power ON.
e. Measure the voltage, which should be about 4.25V without the flash, and 0V
If voltage is not normal, replace the flash power unit.
Troubleshooting
board, and the negative lead on the SG.
with the flash.
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