Xerox 8850 Service Manual page 40

LL-21 Charge/Grid Fault RAP
This fault will occur when the Charge and/or Grid outputs either arc, short, or there is an open
circuit. The High Voltage Power Supply (HVPS) can not always detect arcing from the Charge/
Grid outputs. It depends on the severity and duration of the arcing. The software is set to filter
out short fault signals from the HVPS and shut the Printer down when a significant fault occurs.
If arcing occurs, it will result in a copy quality defect of black lines in the process direction or
solid black copy
Initial Actions
• Check that the Printer firmware is 02.01.51-16 or higher is installed. If not upgrade the
Firmware to the latest version.
• Check that the Tag 6 High Voltage Power Supply is installed.
NOTE: Refer to BSD 9.1 when using this RAP.
Procedure
Table 1 LL-21 RAP
HVPS Output Condition
Charge Pin Shorted
Arcing
NOTE: Severe arching
will cause a crackling/
snapping sound in the
area of the HVPS. Blue
sparking may also be
observed on the HVPS
near the Grid output con-
nector.
Open (bad connection)
Grid Shorted
Arcing
NOTE: Severe arching
will cause a crackling/
snapping sound in the
area of the HVPS. Blue
sparking may also be
observed on the HVPS.
Status Indicator RAPs
LL-21
Corrective Action
Check the Charge Corotron wiring for damage or
a pinch point to a grounded surface. Check for
contamination around the corotron that may pro-
vide a path to ground. If okay, refer to the
and check the High Voltage Power Supply.
Check/Clean the area in the area of the arcing.
Check the Charge Scorotron pins for damage or
proximity to a grounded surface. Repair as
required. If the problem persists, refer to the
and check the High Voltage Power Supply.
Check to ensure all connections are fully seated.
The HVPS may not reliably detect this condition.
The Auto ESV routine (0904) will not function cor-
rectly resulting in: 09 04 Automatic ESV Setup
Failed, Condition 1, or an image quality defect of
blank lines or bands in the process direction, or
solid black copies.
Most unlikely that the Grid will arc. Clean the area
in the area of the arcing. Clean the Grid. Replace
the Charge Scorotron Assembly (PL 9.9).
HVPS Output Condition
Open (bad connection)
GP 1
GP 1
03/2003
2-6
Table 1 LL-21 RAP
Corrective Action
The Auto ESV routine (0904) will not function cor-
rectly resulting in: 09 04 Automatic ESV Setup
Failed, Condition 3. Check to ensure all connec-
tions are fully seated.
8850/ 510DP