Canon PC400 Service Manual - Page 147

I. MAINTENANCE AND INSPECTION, A. Image Adjustment Basic Procedure

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Clean the parts. Scanning system, pick-up/feeding system, and delivery assembly. Is the NO setting of the density correction switch at the middle? Set the switch to the middle. YES Select non-AE, and set the density control dial/lever to 5.5; then, make two to three copies of the Test Chart (NB-3, NA-2, NA-3); see Note 1. Check the following: 1. Density of gray scale No. 9; see Note 2. 2. Difference in density between front and rear; see Note 3. 3. Density of gray scale No. 1; see Note 3. 4. Fogging in white area; see Note 3. COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON) I. MAINTENANCE AND INSPECTION A. Image Adjustment Basic Procedure Is gray scale No. 9 barely noted? (See Note 2.) YES NO Is the problem corrected by the density correction switch? NO YES Is optimum density obtained by adjusting the intensity of light? (See NO YES Check the following: 1. Cartridge. 2. Scanning lamp unit. 3. DC controller/DC power supply PCB (see "Troubleshooting by Image Fault"). End. End. Notes: 1. If a mono color cartridge is used, set the density control dial to 4.5. 2. If NB3 is used, refer to gray scale No. 10. 3. The machine is not equipped with an adjustment function for each type of image fault; see "Troubleshooting by Image Fault." 4. For instructions on how to adjust the intensity of light, see p. 10-6. 10-3

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COPYRIGHT © 1998 CANON INC.
CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-3
I. MAINTENANCE AND INSPECTION
A. Image Adjustment Basic Procedure
Is the
setting of the density
correction switch at the
middle?
Scanning system, pick-up/feeding
system, and delivery assembly.
Select non-AE, and set the density control dial/lever
to 5.5; then, make two to three copies of the Test
Chart (NB-3, NA-2, NA-3); see Note 1.
Check the following:
1. Density of gray scale No. 9; see Note 2.
2. Difference in density between front and rear; see
Note 3.
3. Density of gray scale No. 1; see Note 3.
4. Fogging in white area; see Note 3.
Set the switch to the
middle.
Clean the parts.
Is the
problem corrected by
the density correction
switch?
Is
optimum
density obtained by
adjusting the intensity of
light?
(See
Is gray
scale No. 9 barely noted?
(See Note 2.)
Check the following:
1. Cartridge.
2. Scanning lamp unit.
3. DC controller/DC power supply PCB
(see “Troubleshooting by Image
Fault”).
End.
End.
NO
YES
YES
NO
YES
NO
YES
<Pre-Checks>
<Optimum Density Adjustment>
1. If a mono color cartridge is used, set the
density control dial to 4.5.
2. If NB3 is used, refer to gray scale No. 10.
3. The machine is not equipped with an
adjustment function for each type of image
fault; see “Troubleshooting by Image Fault.”
4. For instructions on how to adjust the
intensity of light, see p. 10-6.
Notes:
NO