Xerox DocuPrint C55 Service Manual page 23

C D
If OK, refer to BSD 9.17 and check the
Transparency Jam Sensor signal CN314-2
for a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the
Transparency Jam Sensor.
Open the printer and remove the Transfer
Discharge Corotron from the left side of the
printer. You will need to squeeze the corotron
handle to release the corotron.
With Scan Row 05 still selected, actuate and
deactuate the Cleaner Jam Switch while
observing the Magenta LED.
The Magenta LED switches on and off.
Y N
Check for an obstruction that is keeping
the Cleaner Jam Switch actuated.
If OK, refer to BSD 9.18 and check the
Cleaner Jam Switch signal CN318-2 for a
short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the
Cleaner Jam Switch.
Exit from the Switch Scan Program.
Scroll to the MOTOR TEST program and
switch on the motors while observing the
Fuser Drive Motor
The Fuser Drive Motor is rotating normally.
Y N
Go to BSD 10.1 in Section 7 and trouble-
shoot the Fuser Drive Motor for an open.
If the motor was noisy, check the clock
lines for an open or short
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Fuser Drive Motor.
E
DocuPrint C55/C55mp/[NC60]
E
Set up the meter to read +24 VDC. Measure
between CN103-4 (+) and ground (− ).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
Y N
Go to BSD 9.16 in Section 7 and trouble-
shoot the Stripper Solenoid signal and +24
VDC Interlocked (CN103-4, CN303-2, 1)
for an open or a short.
If no short or open can be found, replace
the PCU PWB. If the problem still exists,
replace the Stripper Solenoid.
Set up the meter to read +5 VDC. Measure
between CN103-11 (+) and ground (− ).
Switch the power off wait 10 seconds and
switch the power on.
The meter swings from 3.8 VDC to .5 when
the white patch passes in front of the
Gamma Sensor.
Y N
Go to BSD 8.5 in Section 7 and troubleshoot
the Gamma Sensor, all lines, for an open.
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Gamma Sensor.
Refer to Section 6, GP 9.3 and perform the
Transfer Voltage Check.
The Transfer voltage is within specifi-
cation.
F
2/99
2-9
F
Y N
Go to BSD 9.1 in Section 7 and trouble-
shoot the following for an open or short.
• Black Transfer Lead from the Power
Supply.
• Transfer On Signal (CN106-3).
• Transfer Control Signal (CN106-5).
• Bias Control Signal (CN106-6).
• +24 VDC to Power Supply (CN106-1).
If no wiring problem can be found, replace
the PCU PWB. If the problem still exists,
replace the High voltage Power Supply.
Refer to BSD 9.1 in Section 7 and check the
Charge On Signal (CN106-2) for an open.
Check the following:
• Obstructions in the paper path.
• Dirty Feed Rolls.
• Mechanical drive problem.
STATUS INDICATOR RAPs
E6