Canon GP605 Service Manual page 597

<Making Initial Checks>
Does the
NO
copy have vertical
lines?
YES
Clean the following:
[1] Mirrors
[2] Lens
[3] Standard white plate
Execute
COPIER>FUNCTION>CCD>CCD-ADJ
in service mode.
COPYRIGHT © 1999 CANON INC. CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
<Checking the Density Slope>
Is there a
NO
difference in density
between front and
rear?
YES
Check to see if the
standard white plate is
properly mounted. If
there is a gap, correct
it.
Execute
COPIER>FUNCTION>CCD>CCD-ADJ
in service mode.
Is there a
NO
difference in density
between front and
rear?
YES
Check the printer side.
<Checking Solid Black Density>
Is
the density
NO
of gray scale No. 1
(solid black) too low
(light)?
YES
Check the scanning
lamp. If it has reached
its end, replace it.
Clean the following
parts:
[1] Mirrors
[2] Lens
[3] Standard white plate
[4] Dust-proofing glass
[5] Scanning lamp
[6] Reflecting plate
Execute potential
control.
Turn off and on the
power switch, and
make one copy.
Execute
COPIER>FUNCTION>CCD>CCD-ADJ
in service mode.
Is the
NO
density of gray
scale No. 1 (solid black)
too low (light)?
YES
Increase the setting of
COPIER>ADJUST>DENS>
DENS-ADJ in service
mode.
2 Checking the Scanner Side
<Checking for Fogging>
Is gray
Execute
YES
scale No. 10
COPIER>FUNCTION>CCD>CCD-ADJ
(blank) foggy?
in service mode.
NO
<Checking Halftone Density>
YES
Is the
density of gray scale
End.
No. 3 proper?
NO
If too dark,
Decrease the setting of
COPIER>ADJUST>DENS>
DENS-ADJ in sevice mode.
Increase the setting in
COPIER>ADJUST>DENS>
DENS-ADJ in service mode.
Make one copy.
Does the
density of gray scale
No. 3 (halftone)
YES
change?
NO
Check the printer side.
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