Image Adjustment Basic Procedure; Making Pre-Checks; Making Checks On The Printer Unit (1/2) - Canon iR6570 series Service Manual

13.1 Image Adjustment Basic Procedure

13.1.1 Making Pre-Checks

Points to Note When Making a Check on the Printer Side
The machine's potential control mechanisms consist of those for copier image output and those for printer (PDL) image output, and permit independent
adjustment of service mode potential control parameters.
If an image fault occurs, be sure to first find out which is at fault, prepare an image (data) accordingly, and then make appropriate adjustments.
Output Conditions
F value = 5
potential control:
ON

13.1.2 Making Checks on the Printer Unit (1/2)

Clean the following:
1. primary charging assembly grid wire
2. primary charging wire
3. pre-transfer charging wire
4. transfer charging wire
Check the following:
[1] height of the charging wire
If the fault is in the copier image,
Using the NA3 chart, make 2 copies
each in the following modes:
a. AE mode
2. text mode
3. text/photo mode
Generate several prints of the
following test prints:
1. PGTYPE: 4 (blank)
2. PGYTPE: 5 (halftone)
The test print is
free of a fault.
YES
Go to "Checking on the
Reader Side.
<Pre-Checks>
If the fault is in the printer image,
Generate several prints each of
printer (PDL) images that match the
following:
1. image with much white space
-> for a check on fogging
2. image including solid black
-> for a check on solid black
3. image including halftone
-> for a check on halftone density
NO
Go to "Checking on the Printer
Side."
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Chapter 13
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0008-7910
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