Xerox 8850 Service Manual

03/2003
2-3
8850/ 510DP
C1-04/C2-04/C3-04 RAP
Status Indicator RAPs
C1-04/C2-04/C3-04 RAP
NOTE: Roll x means Roll 1, 2, or 3.
The Media Drive Motor (MOT1, BSD 7.1) was trying to feed the Roll x Media forward to the
registration position but the Media Registration Sensor (A21Q1, BSD 8.2) failed to sense the
media.
Initial Actions
• Check the Media Roll (in the Drawer that was in use when the fault occurred).
• Open the Fuser Drawer and check the media path for a media jam or an obstruction in the
media path.
• Manually rotate the Media Transport Drive Motor, BSD 8.1. Motor and Registration Drive
Rolls should rotate smoothly.
• Check the Media Transport Assembly connector A21P/J21 to ensure that it is fully seated
and not damaged. Check the pins for damage.
• Check the Media Registration Sensor connector on the Main PWB (A3P/J607) for dam-
age and ensure that the pin are seated fully and not damaged.
• Check that the Drive Chain, PL 7.2, is OK (BSD 7.1). Adjust the tension on the chain (ADJ
7.1).
• Open the Cutter Drawer and check the Media Exit Guide for damage (PL 7.8).
Procedure
Enter DIAGNOSTICS (To Enter The Diagnostic Mode). Enter [0716] (ROLL DRIVE MOTOR
and ROLL 1 FEED CLUTCH) and observe the Media Drive Motor. The Media Drive Motor
runs.
YN
Check that the Media Drawers are closed. Check the operation of the Drawer Interlock
Switched as follows:
Enter [0713] for Drawer 1
Enter [0714] for Drawer 2
Enter [0715] for Drawer 3
Each Drawer Interlock switch functions correctly.
YN
Go to BSD 7.1 and check the circuit of the Drawer Interlock Switch that does not
function correctly. Check that the actuating magnet is not missing.
Go to BSD 7.1, NOTE 2, and check the resistances of the windings of the Media Drive
Motor (MOT1) The resistances of the windings of the Media Drive Motor (MOT1) are
OK.
YN
Replace the Media Drive Motor (MOT1), PL 7.2.
Go to BSD 7.1, NOTE 1, and check the voltages at A7P1. The voltages at A7P1 are
OK.
YN
Check all wiring between A3P613 and A7P1. If the wiring is OK, replace the Driver
PWB (A2).
NOTE: The Drive Motor PWBs (A24), BSD 8.1, and (A7) are identical and can be
exchanged with each other.
Exchange the Motor PWBs. The Media Drive Motor runs.
YN
Replace the Main PWB (A3) PL 1.1
Replace the Driver Motor PWB (A7) PL 7.2
Go to BSD 8.2, Enter [0917] and then enter [1] on the keypad. Observe the Transport Drive
Motor (A21MOT1). The Transport Drive Motor (A21MOT1) runs.
YN
Go to BSD 8.2, NOTE 4, and check the resistances of the windings of the Transport Drive
Motor (A21MOT1). The resistances of the windings of the Transport Drive Motor
(A21MOT1) are OK.
YN
Replace the Transport Drive Motor (A21MOT1),.
Go to BSD 8.2, NOTE 2, and check the voltages at A24P1. The voltages at A24P1 are
OK.
YN
Check all wiring between A3P613 and A24P1. If the wiring is OK, replace the Driver
PWB (A2),.
NOTE: Drive Motor PWBs (A24) and (A7), BSD 7.1, are identical and can be exchanged
with each other.
Exchange the Drive Motor PWBs. The Transport Drive Motor runs.
YN
Replace the Main PWB (A3) PL 1.1
Replace the Driver Motor PWB (A7) PL 7.2
Go to BSD 8.2. Enter [0803] and check the Media Registration Sensor. The Media Registra-
tion Sensor is OK.
YN
Check the wiring of the Media Registration Sensor (A21Q1). If the wiring is okay, replace
the Media Registration Sensor PL 8.2.
Check for mechanical binding or broken parts in the area of the Registration Drive Rolls and
Pinch Rolls. Check for an obstruction in the media path.
Table 1 Media Roll
Roll 1 BSD 7.2
Roll 2 BSD 7.3
Roll 3 BSD 7.4
A
A
B
B

Xerox 8850 Specifications

General

Brand	Xerox
Model	8850
Category	Printer
Language	English