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Part 4: Technical Reference
· Rank resistor
To execute optimum heat control of each BJ cartridge, production-related deviation
in heater characteristics is classified into 13 types which are identified by changing
the rank resistance. From the MPU & Printer Controller's analog port, the MPU
detects the different rank resistances as voltage values and converts them from
analog to digital for detection. The heater's characteristics are thereby recognized.
· Head temperature sensor
Temperature changes in the nozzle's heater are detected by the diode to prevent the
bubble jet head from overheating.
· Cartridge ID
The BJ cartridge type (color or black) is recognized, through combinations of ID0,
ID1, and INKS2.
5) Ink cartridge detection and identification feature
This printer detects the presence of a BJ cartridge by the two resistance values of
TOP (pin 9) and DIODEA (pin 10) of the cartridge signal contacts. When the
resistance value of TOP is 750 or less and that of DIODEA is not zero , the printer
decides that the cartridge is installed. When the resistance values of these pins do
not comply with the above values, the printer decides that a cartridge is not
installed.
When the printer detects the BJ cartridge, the installed BJ cartridge is identified
(black, color, or photo BJ cartridge) based on ID0 (pin 11), ID1 (pin 12), and INKS2
(pin 13) of the cartridge signal contacts.
If the printer is turned on without the BJ cartridge (for example, if the user turns on
the printer immediately after unpacking the printer), the carriage automatically
moves to the cartridge replacement position regardless of its previous position. Also,
if the printer is on and the cartridge is removed without replacement, a BJ cartridge
not installed error will occur.
TABLE 4-2 HEAD INSTALLATION STATUS AND SIGNAL DETECTION
Black BJ cartridge installed
Photo BJ cartridge (Multi-Drop) installed
Color BJ cartridge (Multi-Drop) installed
Color BJ cartridge installed (reference)
Photo BJ cartridge installed (reference)
Scanner cartridge installed
High: Signal detected
Low: No signal detection (by printer)
ID0
ID1
INKS2
Low
Low
Low
High
High
Low
High
Low
High
High
-
-
(High)
4-16
BJC-2000
TOP
High
Low
Low
Min.
60
High
High
Under
60
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