Background (Black); Background (Color) - Xerox DocuPrint C55 Service Manual

Defect Name / Description

2. BACKGROUND (BLACK).

3. BACKGROUND (COLOR).

IMAGE QUALITY RAPs
IMAGE QUALITY DEFECTS
Possible Causes
1. Developer Failure.
2. New developer assembly did not initialize.
3. No Black Developer Bias.
1. Developer Failure.
2. No Grid Low signal.
3. Temperature/RH Sensor failure.
2/99
3-4
Corrective Action
1. Replace the Black Developer Module.
2. Run a Diagnostic Sheet and check the Toner
Concentration Setpoints for newly installed
developer assembly. If the Setpoints are at
70 (default), replace the developer assembly.
3. Refer to BSD 9.1 and check the Black
Developer Bias voltage. If the voltage is
present, check the Black Developer Bias
lead for an open. If no bias is present,
replace the High Voltage Power Supply. If
the problem still exists, replace the black
developer module.
1. Replace the Color Developer Module.
2. Refer to BSD 9.1 and check the Grid Bias
(Low) signal CN106-8 for a short to ground.
If OK, replace the color developer housing.
3. If the readings on the diagnostic sheet are
out of range (RH=0 or RH > 100, or
Temp=0), refer to the chart below:
Diag.
Refer to BSD 9.19 and check:
Sheet
RH=0 CN105-1, Humidity Sense, for a short to ground.
100 CN105-1, Humidity Sense, for an open.
>
RH
CN105-2, Humidity Sense, GND for an open.
Temp=0 CN105-5, Temp. Sense, for an open or short to
ground.
If the wiring checks OK, replace the Tem-
perature/Humidity Sensor.
DocuPrint C55/C55mp/[NC60]