User Guide

CHAPTER 6 IMAGE FORMATION SYSTEM

6-14

1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

7. Auto Gradation Correction in User Mode

a. Outline

The copier’s auto gradation correction is designed to produce ideal gradation in images.

A 64-gradation halftone image (for each color) is printed in user mode, and the density of the

output is read by the CCD of the reader unit for the following control:

· Correcting the laser output.

· Correcting gradation

b. Operations

For instructions on how to operate user mode, see Chapter 1.

1) Generate auto gradation correction test prints 1 and 2 (64 gradations for each color) in user

mode. Make sure that test prints 1 and 2 differ in resolution.

Figure 6-207

2) Place the generated test print on the copyboard glass, and have the copier read it. The copier

will determine the laser control value and the gradation control value from the image data it

collected from the test print.

8. Checking the LED Activation for the Potential Measurement Circuit

LED1 remains on at all times as long as the copier is supplied with power, indicating that the

potential sensor is operating normally. If it is not in a normal way, suspect that the 24 V-F power is

not supplied or the potential measurement unit is faulty.

YKMC

KYCM

YKMC

Test print 1 Test print 2