Xerox Synergix 8850, Service Manual

Page: 47 / 432

03/2003
2-13 8850/ 510DP
09 04 Automatic ESV Setup Failed, Condition X
Status Indicator RAPs
09 04 Automatic ESV Setup Failed, Condition X RAP
The message 0904 AUTOMATIC ESV SETUP FAILED, CONDITION X (X being a numerical
value) is displayed with the Printer in the Diagnostic Mode and when [0904] is entered.
The logic detects that the Process Control System failed to adjust the Xerographic Develop-
ment Field (V Dev) or the Cleaning Field (V Clean) to printer specification. The Process Control
System is designed to automatically monitor and adjust the Drum Electrostatics at each 10K
linear feet (3K meters) of media run.
This fault may occur if there is a problem with the High Voltage Power Supply, Electrometer
Probe (ESV1), the Electrometer Probe PWB (A31) or the related circuitry. A Condition 1 is
declared if there is an open or short in the Charge Scorotron Grid or wiring. A Condition 3 will
be declared if there is an open or short in the Coronode, Erase Lamp or the associated wiring.
NOTE: The Charge Scorotron, BTR clean output, Detack Corotron, and Developer Housing
Magnetic Roll are monitored independently by the Process Control System. If a fault is
detected one of the following will occur:
• An LL.XX Status Code for the failed component will be displayed in the normal run mode.
Refer to BSDs 9.1 and 9.8.
• Should the Image Bar LEDs fail, a Blank Print or Partial Image is produced. Go to Section
3 - Print Quality 6 - for information on how to troubleshoot LED problems.
Initial Actions
• If the Electrometer (ESV 1) was removed, power the Printer off then on, then perform the
0904 (
ADJ 9.2 ) again.
• Examine the Electrometer Probe (ESV1), the Electrometer Probe PWB (A31), and its har-
ness for damage. Go to BSD 9.1.
• Ensure that the Electrometer Probe PWB (A31), connectors (A31P-2 and A31P-1) are
seated correctly and that the pins are fully seated within the connectors.
• Ensure that the Electrometer Probe (ESV1) is not contaminated with toner or foreign mat-
ter. Clean as required.
• Check the wiring between the HVPS and the Charge Scorotron Coronode and Grid for an
open circuit.
• Ensure that the HVPS (PS 3) connector (A25P1), Charge, Grid, Developer Magnetic Roll
Bias, Bias Transfer Roll and Detack connectors are seated correctly and that the pins are
fully seated within the connectors.
• Check that the daughter PWB, that is mounted vertically on the HVPS, is fully seated.
Procedure
Enter [0966] and visually check that the Erase Lamp is on.
Y N
Refer to BSD 9.6 and troubleshoot the Erase Lamp.
Refer GP 1 and check the voltage output for the Charge and Grid.
The output at PIN 1 and GRID is within the specification or fluctuating.
Y N
Connect the (+) meter lead to the Main PWB (A3) connector (A3P 601-16). Connect the
(-) meter lead to (A3P 601-14), shown on BSD 9.1.
There is (+) 24 VDC present.
Y N
Check for an open or a short circuit to ground in the wires connected to (A31P1) and
(A3P601). Repair the wires as required.
Connect the (+) meter lead to the Main PWB (A3) connector (A3P 601-13). Leave the (-)
meter lead at (A3P 601-14). Enter [0904] and press ENTER.
The meter reading varies
between (0.08 and 2.4 VDC) as the Drum rotates.
Y
N
Replace the Electrometer Probe (ESV) and the Electrometer Probe PWB (A31) ( PL
9.9 ).
Replace the Main PWB (A3) ( PL 1.1 ).
Enter [0921-2] Check the voltage between J7 and A25P1/J1-16. The voltage is low, less
than 1 VDC.
Y
N
Check the Charge and Grid circuitry for an open or short. Check the coronode and grid for
damage or contamination. Repair the wires, grid, or coronode as required. If there is no
short or open, Replace the HVPS (
PL 1.3 ).
NOTE: Severe arcing will cause a crackling/snapping sound in the area of the HVPS.
Blue sparking may also be observed on the HVPS.
Replace the HVPS ( PL 1.3 ).
A
A