Xerox 8830 Service Manual page 499

Problem Observed
The Scanner fails the
Normalize Cameras test
The Exposure Lamp is not on,
but the 4 green LED voltage
indicators are on
The Exposure Lamp is lit
dimly
The Scanner does not
transport an inserted
document to the registered
position, but the Exposure
Lamp is on.
The image appears stretched
or compressed in the process
direction
The image has a gap or an
overlap region along the
process direction
Document does not scan but
does register.
1.0 Entry RAP
Table 1. Additional Symptoms.
Probable Cause
1. There is dirt on the Document Hold-
down Guide or the Platen Glass.
2. Platen Glass is installed wrong.
3. There is a fault in the camera cables,
the Control PWB, or the Cameras.
Fault in the Lamp, Lamp Ballast, control
circuits for the Lamp.
Fault in high voltage return circuit for the
Lamp, the Lamp, Ballast,
1. The Scanner is normalizing cameras
after being switched on.
2. Sensor fault
3. Fault in the document drive circuitry
or mechanical drive
Fault in the Document Transportation
system.
The Stitch adjustment is incorrect.
1. SCSI Cable between Scanner and
SIM Is not securely seated
2. Faulty SCSI cable between Scanner
and SIM
Corrective Action
1. Clean the Platen glass and
Document Hold Down Guide.
Switch off, then switch on, the
Scanner and the CONTROLLING
DEVICE.
2. Ensure that the Platen Glass is
installed correctly.
1. Wait 1 minute and try again.
2. -
3. --
Configure for diagnostics; perform the
Front/Back Stitch adjustment and the
Left/Right Stitch adjustment
1. Reconnect the cable. Switch off the
Controlling Device and Scanner.
Switch on the Scanner. Switch on the
Controlling Device
2. Replace the Cable. Reconnect the
cable. Switch off the Controlling Device
and Scanner. Switch on the Scanner.
Switch on the Controlling Device
2/98
2-4
If the Problem Still Exists
Go to the Scanner Will Not
Normalize CQ RAP in Section
3.
Go to 1.3 Exposure Lamp
RAP
Go to 1.3 Exposure Lamp
RAP
1. -
2. Go to the Sensors and 1.5
FORWARD/REVERSE
Switch RAP.
3. Go to the 1.4 Document
Drive RAP
Go to 1.4 Document Drive
RAP.
If the tests fail repeatedly or a
satisfactory adjustment cannot
be made, the Scanner must
be exchanged.
Go to the Level 1 on the
Controlling Device service
manual.
7356 Scanner