Canon CP660, Service Manual

Page: 115 / 407

COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
F. Checking the Presence/Absence of a Color Toner Cartridge
The presence/absence of a color toner cartridge is detected by the cartridge sensor
(PS1901C), which consists of a light-emitting section and a light-receiving section.
When the color toner cartridge in question is set, the light from the light-emitting sec-
tion is reflected by the cartridge and reaches the light-reflecting section; in the absence
of the cartridge, on the other hand, it enters the machine, not reaching the light-receiv-
ing section. The DC controller PCB identifies the condition as the absence of the color
toner cartridge, and communicates the fact to the printer board*
1
to stop the machine.
The machine checks the presence of cartridges when the power is turned on or when
the various covers have been opened/closed.
*
1
Reader controller PCB (when making prints with the reader unit installed).
G. Checking the Level of Black Toner and the
Presence/Absence of the Black Toner Cartridge
The level of black toner is checked by the antenna sensor inside the black toner car-
tridge. The output of the toner antenna (toner level detection signal) is sent to the DC con-
troller PCB through the high-voltage PCB, which checks on the signal at such times as
black developing AC bias is applied to the black developing cylinder.
If the level is below a specific value, the DC controller PCB communicates the
absence of black toner to the printer board*
1
.
The presence/absent of the black toner cartridge is checked by a switch (black toner
cartridge detecting switch SW644) inside the copier.
*
1
Reader controller PCB (when making prints with the reader assembly installed).
CHAPTER 4 IMAGE FORMATION SYSTEM
4-17
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