Printronix L5000 Series Maintenance Manual page 367

4. Check the developing unit.
a. Connect CN26 on the I/O board.
b. Put the positive lead of the digital multimeter on collector Q22 on the I/O
board, and the negative lead on the SG.
c. Measure the voltage, which should be about 5V.
If voltage is not normal, replace the developing unit (the toner empty sensor is
defective).
Troubleshooting 7–77