Xerox 8830 Service Manual page 278

LOUD NOISE FROM THE HVPS
PROBLEM
Loud noise or squeal coming from the High
Voltage Power Supply.
CAUSE
Poor connection between the High Voltage
Power Supply and the Charge Scorotron.
SOLUTION
Check the Charge Scorotron leads for an open
or poor connection, if damaged repair or
replace the Charge Leads (part of the Charge
Scorotron Endblock Kit)
REQUIREMENTS FOR FIELD RESOLUTION
• DOCUMENTATION
N/A
• TAG
N/A
• PART NUMBERS
600K58730 Scorotron Endblock Kit
• CUT IN SERIAL NUMBER
Service Notes
TROUBLESHOOTING
PHOTORECEPTOR DRIVE
PROBLEMS
PROBLEM
Photoreceptor drive may stall causing blank
prints
CAUSE
There is more than one cause of this problem,
other than hard failure. Check the items listed
below before troubleshooting the circuit or
replacing components:
SOLUTION
NOTE: The photoreceptor drive circuit has an
overcurrent protection built into it. If the circuit
detects no drum drive or high current the drive
system will shut down. When this occurs,
the printer must be powered off then on to
reset the circuit
1. A poorly lubricated cleaning blade and
photoreceptor can cause photoreceptor
stalls or squealing. Use the double buff
procedure when servicing the cleaning
components.
NOTE: Excessive zinc stearate can cause
print quality problems but the photoreceptor
will recover back to normal performance.
2. Ensure that the screws that hold the
scorotron in place are fully seated . If they
are not they can touch the ends of the
photoreceptor and stall it.
1/98
6-44
3. Ensure that that the plastic "skis" that are
located on the top of the turn baffle do not
contact the photoreceptor. To check this
remove the developer housing and place a
piece of paper between the "skis" and the
photoreceptor. The paper should pass
freely between them. if it does not
perform the transport adjustment.
4. Ensure that the Photoreceptor
coupling is securely fastened to the motor
and drive shaft. Rotate the shaft, if the
coupling appears to "wobble" replace it.
REQUIREMENTS FOR FIELD RESOLUTION
• DOCUMENTATION
N/A
• TAG
N/A
• PART NUMBERS
N/A
• CUT IN SERIAL NUMBER
N/A
drive
8830