Adj 4.1.2 Calibrate Document Registration - Xerox 8830 Service Manual

Parts List on PL 5.1
Purpose
Note; The test patterns are stored inside the Document Feed Tray.
The purpose of this adjustment is to allow the Scanner to determine
correct timing values for actuation of the two document edge sensors,
enabling the Scanner to correctly register the lead edge of the document
before the start of a scanning operation.
Procedure
Note: This procedure uses the SCSI 7356 software as loaded onto a
Personal Workstation or other personal computer directly connected to
the Scanner. If the controlling system has its own built-in diagnostics,
see the service manual for the controlling system.
Check
1. Insert a document when the Scanner is ready, and allow the
document to be transported to the starting position.
2. (Figure 1): Examine the position of the lead edge of the document.
The lead edge should be within ± 0.25 inch (0.64 cm) of the middle
of the Platen Window. If the position is not correct, perform the
adjustment.
Adjustment
1. Configure the system cabling for running the diagnostic software, if
required.
Note: If the Scanner is not already directly connected to the SCSI
port of the computer on which the diagnostic software will run, then
re-cabling is required. Go to Section 6 for more information.
2. Start the diagnostic software, using the procedure appropriate for
the system to which the Scanner is connected.
Refer to Section 6.
3. Select the Component Tests button from the Service Diagnostic
Menu screen.
4. Select the Calibrate Document Registration button.
5. Select the Begin button.
7356 SCANNER
When the motor starts, insert the black Test Pattern or an 8.5 x 11
6.
inch (or A4) sheet of black paper with the short edge as the lead
edge, and with the lead edge centered on the Edge Present Sensor.
Note: The software checks the timing of the sensor actuation, and
stores new correction values automatically. The screen displays Passed
if the adjustment was successful; otherwise, FAILED is displayed. If
FAILED is displayed, refer to Section 2, Repair Analysis Procedures.
7. Configure the system cabling for normal operation, if required. Go to
Section 6 for more information.
8. Repeat the Check procedure again.
Lead Edge
Platen Glass
Document
Figure 1. Registration of the Lead Edge - Top View
4/97
4-39
REAR
Platen Window
FRONT
ADJ 4.1.1