Canon CP660, Руководство по обслуживанию

Страница: 120 / 407

COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Note:
1. A color toner cartridge is assumed to have been taken out and put back in when
the toner cartridge cover is opened. For the control mechanism to start when the
color toner cartridge cover is closed, the right cover must be closed and, at the
same time, the black toner cartridge and the drum cartridge must be inside (so that
the color toner cartridge cover may be checked).
The black toner cartridge is checked by the black toner cartridge detecting switch.
For the control mechanism to start, the right cover and the color toner cartridge
cover must be closed and, at the same time, the black toner cartridge and the drum
cartridge must be set inside.
2. The right cover and the toner cartridge cover must be closed and, at the same time,
the black toner cartridge and the drum cartridge must be set inside for the presence
of the drum cartridge to be recognized. (Otherwise, density correction control is not
performed.)
C. Image Gradation Correction Control (requires a PS/PCL
Board)
The DC controller PCB draws a density detection pattern for each color on the inter-
mediate transfer drum using a developing bias and a primary charging bias determined
as a result of image density correction control using image data from the printer board
(PS/PCL Board).
Then, the DC controller PCB checks the density detection pattern using the density
sensor, and sends data to the printer board, which in response performs gradation cor-
rection to ensure ideal halftone images.
Image gradation correction control is started in response to a command from the
printer board, and is initiated after image density correction control.
CHAPTER 4 IMAGE FORMATION SYSTEM
4-22
Download free service manual at http://printer1.blogspot.com