Canon iR6570 series Service Manual page 478

Chapter 13
E
13-6
<Checking the Solid Black
Make a copy of
the NA3 Chart in text mode. Is
gray scale No. 1 (solid black)
too light?
YES
Check the life of the
scanning lamp; if it has
reached the end of its
life, replace it.
Clean the following:
1. Mirrors
2. Lens
3. Standard white plate
4. Scanning lamp
5. Reflecting plate
Executing Potential Control
Turn off and then on the power switch; then,
make a copy.
Execute shading adjustment in service
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
Is the density of
gray scale No. 1 (solid black)
too low (light)?
YES
Perform the instructions under
"Checking the Solid Black Density"
for the printer unit.
Density>
<Checking for Fogging>
Make a copy of
NO
the NA3 Chart in text mode.
Is the white background
foggy?
NO
G
Make a copy of the
NA3 Chart in AE mode. Is the
output foggy?
NO
NO
F-13-7
YES
F
YES
H
J
K
L