Canon imageCLASS X LBP1238, Service Manual

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Test Print
Engine Test Print
This machine has an engine test print function to check whether the printer engine is operating normally.
NOTE:
The engine test print can be performed by using only the DC Controller. Therefore it can be output even when the Main Controller
is failed.
There are two types of engine test print: 1-sided print and 2-sided print.
1. Load A4/LTR paper in the cassette.
2. While the machine is in the standby mode, open and close the Cartridge Door for the predetermined number of times
in a row.
• In case of 1-sided print
4 times
• In case of 2-sided print
5 times or more
3. An engine test print is executed, and the test pattern as shown below is printed on one side or both sides of a sheet
of paper.
Controller test print
The following test print types are available with this machine, and you can check for failure of an image with a circle 'Yes' described
in the image check items in the table below. When no failure is found in the test print in normal output mode, it can be caused in
PDL input or Reader.
The image of the test print is generated by the Main Controller PCB.
PG-TYPE TYPE Pattern Image check items
Grada-
tion
Fog-
ging Trans-
fer fail-
ure
Black
line
White
line
Uneven
pitch
Uneven
density
Right
angle Straigh
t lines
Magni-
fication
ration
0 Grid Pattern Yes Yes Yes
1 Halftone Pattern Yes Yes Yes Yes Yes
2 Black Pattern Yes Yes Yes Yes
3 White Pattern Yes Yes
4 Gradation 17 Pattern Yes Yes Yes Yes Yes
5 Thin Horizontal Line
Pattern Yes Yes
6 (For R&D use)
7 (For R&D use)
7. Troubleshooting
131