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17 – High Voltage Fail
1. Ensure that the back bracket on the fuser unit is not bent. Measure the resistance
between the fuser unit and the transport unit near the belt; it should measure
open. If there is a short–circuit, repair or remove the bracket.
2. Ensure that the following mechanisms are properly installed (otherwise, a
no–load condition may result). Check the main charger, transfer charger,
separator charger, pre–charger, developing unit, and cleaner unit. Ensure that the
wires for the chargers are not broken.
3. Remove any foreign matter or grime in the chargers, etc. (foreign matter causes
excessive current).
4. Determine if the resistance between the cleaner unit brush and the roller axis is
too low.
a. Remove the cleaner unit.
b. Remove the two black sticker covers on the front of the cleaner unit.
c. Measure the resistance between the two shafts; it should measure high or
5. Check the high–voltage power unit.
a. Put the positive lead of the digital multimeter on pin 12 of CN23 on the I/O
b. Measure the voltage, which should be about +5V.
If voltage is not normal, replace the high–voltage power supply unit.
6. On the developing unit, raise the lever straight up and determine if a
high–voltage failure occurs. If this occurs, replace the developing unit.
Troubleshooting
CHECKLIST:
BACK BRACKET ON FUSER UNIT
MECHANISM SETTINGS
HIGH–VOLTAGE POWER SUPPLY
DEVELOPING UNIT
CHARGERS
DRUM
open.
board, and the negative lead on the SG.
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