Gp 21 Component Control (Iit); Gp 22 Printing Internal Test Patterns (Iit - Xerox Phaser 790 Service Manual

GP 21 Component Control (IIT)

The purpose is to display the logic state of input signals and to energize output components.
Procedure
1. Enter the Diagnostic Mode (IIT) (GP
2. Navigate to Diag-Code, and press the Select button.
3. Enter DC Code = 330; subcode = 001, and press Select.
4. Enter the appropriate Parameter1/Parameter2 value for the component to be energized:
Table 1 Component Control Output Codes
Component Parameter 1
Exposure Lamp 0001
APS Sensor 0002
Cooling Fan 0004
IIT LVPS 0008
General Procedures and Information
GP 21, GP 22
19).
Parameter 2 BSD Ref
0000 6.4
0000 6.4
0000 6.4
0000 6.5

GP 22 Printing Internal Test Patterns (IIT)

The purpose of the Internal Test Patterns procedure is to enable the IIT to print out various
modes of black and white or color prints in several patterns.
Procedure
1. Load paper in the Bypass Tray.
2. Enter the Diagnostic Mode (IIT)
3. Use the up, down, left, and right arrow buttons to highlight the Self Diag menu and press
the Select button.
4. Use the up, down, left, and right arrow buttons to highlight the Test Print menu and press
the Select button. The following will be displayed:
Color Mode __
Pattern __
the combination of Color Mode 0 and Pattern 6 ALWAYS creates jams at the nip of the fuser.
This pattern generates process black up to the lead edge of sheet; the resulting sheet will not
go through the fuser nip.
5. Use the number buttons to enter the number for the Color Mode value from
the Color Mode & Pattern screen.
6. Use the Down Arrow button to scroll down to Pattern.
7. Use the number buttons to enter the number for the Patterns value from
8. Press the Select button.
9. Press the Start button.
NOTE: For every Color Mode (0 - 5) there are six possible test patterns that can be
printed, with the exception of Color Mode 1.
Color Mode 1 is not available with Patterns 4, 5 and 6.
Color Modes 3, 4 or 5 with Pattern 5 will yield a blank page.
Table 1 Menu of Test Patterns
Color Mode
0 - Color (Test/Photo)
1 - Color (Photographic Paper)
2 - Color (Print Photo)
3 - B/W (Text/Photo)
4 - B/W (Text)
5 - B/W (Photo)
03/01
6-22
(GP 19).
CAUTION
Patterns
1 - Grid
2 - Gradation in Main Scan Direction
3 - Gradation in Sub Scan Direction
4 - Color Patch
5 - Lab Gradation
6 - Gradation in Main Scan Direction
Phaser 790/DocuColor 2006
Table 1 on
Table 1.