Xerox 8830 Service Manual page 519

Print Defect Isolation RAP
The purpose of this RAP is to classify image quality problems and direct
the customer service representative to the appropriate repair analysis
procedure. The procedure may be in this section or in
Section 2.
Before trying the procedures and corrective actions in this service
manual, the customer service representative should first determine that
the image quality fault is not caused by a malfunction in the device that
controls the Scanner, or in the Image Output Terminal (IOT) device. This
controlling system may be a Xerox ES8150 SIM, a Xerox Productivity
Centre (XPC), an 8830 Controller, a standalone controlling computer, or
other controlling device.
The diagnostic software (SCSI7356) contains a viewer so that you may
directly view an image made by the scanner on the screen of the
computer that runs the diagnostic program. In the case of the ES8150
or the XPC, you must first connect the Scanner to the SCSI port of the
SIM computer before running the diagnostic program. Others will
require the use of a laptop computer with the SCSI7356 Diagnostic
software loaded to view the image. Refer to Section 6 for detailed
instructions.
Initial Actions
Ask the customer to tell you the action that produced the fault.
Switch off the Scanner and the controlling system. Switch on the
Scanner; then switch on the controlling system. Repeat the action that
produced the fault.
Procedure
Make a copy of a test pattern that is stored internally on the IOT.
The Image Is correct.
Y N
I Repair the problem in the IOT.
A
7356 Scanner
Make a copy of a test pattern or image stored internally in the controlling
device. If there is no controlling device, continue down the Y path; the
fault is in the scanner.
The Image is correct.
Y N
I Repair the problem in the controlling device.
The fault is in the Scanner or its connections to the controlling device.
Configure the system for diagnostics. Start the SCSI7356 diagnostic
software.
Select Normalize Cameras. The test will pass or fail. Select Exit. If the
test failed, a message is displayed warning that normalization is required
for valid image quality tests. Ignore this message at this time, and select
OK.
Select Scan and View from the Service Diagnostic Menu. Insert the
82E5980 test pattern.
The Scanner transports the document to the starting position
Y N
Go to the Document Drive RAP (Section 2) and continue to isolate
the fault.
Select Start Scan from the Scan and View menu.
After the scan is complete, select View Image. Examine the image. Go
to Table 1 and locate the description that most closely describes the
image quality problem. In certain cases, an illustration of the problem is
provided.
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3-3 Entry RAP