Xerox Phaser 790, Service Manual

Page: 72 / 653

10/00
2-58 Phaser 790/DocuColor 2006
005-701
Initial Issue Status Indicator RAPs
005-701 ADF Entrance Jam RAP
Procedure
The green LED of the Document Set Indicator is always lit.
Y
N
Remove the ADF Rear Cover. There is +5 VDC from J 814 pin 5 to frame ground.
Y
N
Disconnect P/J 712. There is +5 VDC from J 814 pin 5 to frame ground.
Y
N
Go to Flag 4. Check for a short circuit. If the wire is OK, replace the ADF Con-
trol PWB (PL 17.2).
Replace the ADF Registration Sensor (PL 17.5).
Open the Upper Chute Cover. Insert a sheet of paper into the Registration Chute until it
blocks the ADF Registration Sensor. There is less than 1 VDC from J 814 pin 5 to
frame ground.
Y
N
There is +5 VDC from pin 6 to pin 4 of J814.
Y
N
Replace the ADF Control PWB (PL 17.2).
There is +5 VDC from pin 1 to pin 3 of J 712.
Y
N
Go to Flag 5. Check for an open circuit.
Replace the ADF Registration Sensor (PL 17.5)
The Gear (PL 17.3) on the outboard end of the Feed Roll (REP 5.4) and the Pulley (PL
17.2) on the inboard end of the Nudger Roll (REP 5.5) contain one-way clutches. Ensures
that these parts are installed correctly, and that the clutch functions per the descriptions in
the repair procedures. The Gear and Pulley are OK.
Y
N
Clean, repair, reinstall or replace as required.
Check the following for wear, damage, or dirt:
• Drive Belts (PL 17.2)
• Feed Roll (PL 17.3)
• Registration Roll (PL 17.3)
• Retard Rolls (PL 17.4)
• Platen Belt, Bearings, and Drive Gear (PL 17.6).
• Ensure that the Nudger Chute (PL 17.4) moves freely.
The checks are good.
Y
N
Clean, repair, or replace as required.
Go to Flag 3. Check for broken wires or loose pins. If the problem continues replace the
ADF Control PWB (PL 17.2).
If the problem remains, replace the ADF Drive Motor (PL 17.2).
There is +5 VDC from pin 3 to pin 1 of J814.
Y
N
Replace the ADF Control PWB (PL 17.2).
There is +5 VDC from pin 1 to pin 3 of J 711.
Y
N
Go to Flag 2. Check for an open circuit.
Disconnect P/J 711. There is +5 VDC from J 814 pin 2 to frame ground.
Y
N
Go to Flag 1. Check for a short circuit. If the wire is OK, replace the ADF Control PWB (PL
17.2).
Replace the Document Set Sensor (PL 17.5).
A
A