Ipu Front/Back Test Patterns: Sp2902-001,002 - Ricoh D131 Service Manual

5.3.2 IPU FRONT/BACK TEST PATTERNS: SP2902-001,002


Front side pattern (SP2902-001). Generated by the IPU in place of data scanned from the
front side of an original (CCD > SBU). Generated in the scanner image correction circuit.

Back side pattern. (SP2902-002. Generated by the IPU in place of data scanner from the
back side of an original (CIS > SBU). Generated in the scanner image correction circuit.
The IPU test patterns are primarily used for design purposes. However, they can be used as
follows:

To confirm that the IPU is processing images correctly.

To fine tune the image processing parameters

To help trace the causes of poor images. For example, if the IPU test patterns are normal
when the machine is producing poor quality images, then the problem must be after the IPU.
1. Enter the SP mode, select SP2902.
2. Select 001 to print a test pattern for the front side, or select 002 to print a test pattern for the
back side.
3. Scroll then select the number of the test pattern that you want to print (see the table below).
4. Press [#].
5. Press Copy Window to open the copy window, then select the settings for the test print (paper
size, etc.)
6. Press [Start] to start the test print.
7. Press SP Mode (highlighted) to return to the SP mode display.

Patterns 6, 8, 9, and 11 are the best choices for testing and confirming the operation
of the IPU.
SM 5-11
Test Pattern Printing
D131/D132/D133