Checking The Periodically Replaced Parts; Others; Standard Image; Gray Scale - Canon CLC5000 Service Manual

3.1.7 Checking the Periodically Replaced Parts

a. Check the periodically replaced parts against the Scheduled Servicing Chart, and replace
those that reached the end of their lives.

3.1.8 Others

When a machine is brought from a cold to a warm place in winter, its inside can start to
develop condensation, leading to various problems.
a. Condensation on the original illuminating system or the laser exposure system (glass,
mirror, lens) causes light or dark images.
b. Condensation in the charging system can cause leakage.
c. Condensation in the pick-up system or on the feeding guide plate can cause feeding
problems.
If condensation is noted, dry wipe the part or leave the machine powered for 10 to 20
minutes.
If uneven density (difference in density between front and rear), light im-
ages, or fogging is noted, perform the "Image Adjustment Basic Procedure"
first.

3.2 Standard Image

What is referred to as a "standard image" is an image in which the gray scale, color
patches, and 3-color gradation scale are as follows when the Canon CA-1 Test Sheet is cop-
ied in four full colors.

3.2.1 Gray Scale

No. 1 (dark area) is more or less black and the density grows lighter with No. 8 (light)
area being barely visible and No. 9 being white.
The color of the halftone area is more or less gray but is not appreciably yellowish or bluish.

3.2.2 Color Patches

Each color can be distinguished and is not appreciably different from its original color
(Test Sheet).

3.2.3 Photo

The color balance is not appreciably different from the original.

3.2.4 3-Color Gradation Scale

No. 8 is barely visible with No. 9 being white.
COPYRIGHT © 2001 CANON INC.
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
2000 2000 2000 2000 CANON CLC5000 REV.0 JAN 2001
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