Canon BJC6500 - BJC 6500 Color Inkjet Printer, Service Manual, Page: 95 / 115

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BJC-6500 Part 5: REFERENCE
REFERENCE
1.5 Detection with Sensors
This printer has the following sensors to detect the printer's status.
In the BJC-6500, to more accurately detect the pick-up roller's position, a photo-
interrupter type ASF sensor has been added.
With the ASF sensor, as the pick-up roller's position can be detected, incorrect pick-up
roller position during initialization and paper pick-up operations can be detected.
1.6 BJ Cartridge Identification
This printer determines whether a cartridge is installed or not by the
resistance values of DIA (pin 30) and DIK (pin 31) on the signal contact
pad. For example, if only 1 cartridge is installed, or if the scanner
cartridge (recognized only in the left cartridge) is installed in the color
cartridge (right) side, a "Cartridge not installed" error will occur.
When the printer determines that a cartridge is installed, serial
communication through 6 signals (HCLK, pin 13; HDATA, pin 9; HRESET, pin 29;
DIR, pin 28; HCHKR, pin 18; and HLAT, pin 19) is conducted, and the type of
cartridge installed (Black, Color, Photo, or Scanner) is detected, along
with its' head rank.
If the installed cartridges are not correctly matched, a "Cartridge
Mis-installed" error will occur.
Internal Temperature
Sensor
Ink Sensor
Cover Sensor
Paper End Sensor
Pump Sensor
Home Position Sensor
Print Position Sensor
ASF Sensor
Figure 5-7 Sensor Positions