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Part 4: Technical Reference
• 128-bit/136-bit shift resistor
Stores the print data (HDATA) transferred from the logic board using the HCLOCK
timing.
• 128-bit/136-bit latch
Latches the print data (HDATA) converted by the 128-bit/136-bit shift resistor.
• Block enable decoder
After the BENB (block enable) 1, 2, and 3 code signals are input, the specified heat
timing signal is output. The heat timing signal is divided into eighths.
• Heater (1 to 128 and 1 to 136)
The heater boils the ink to produce bubbles required for the nozzles to discharge
ink. The heater heats the bubble jet nozzles. Heating is performed with the timing
signal produced by the block enable decoder, the even number nozzle heat enable
(EvenENB), odd number nozzle heat enable (OddENB), and heat enable (HENB0 to 3)
signals.
• Sub-heater
This heater maintains optimum conditions in the nozzle for discharging ink.
• Temperature control heater
This heater controls the head temperature to stabilize the ink discharge amount.
• Rank resistor
To perform optimum ink discharge control, manufacturing inconsistencies in the
heater characteristics of each BJ cartridge are categorized into 13 types which are
identified by changing the rank resistance value. The printer receives the
differences in the rank resistance as voltage values from the analog port of the MPU,
and detects them after analog to digital conversion. The heater's characteristics are
thus recognized.
• Head temperature sensor
The temperature changes occurring in the heaters of the nozzles are detected by the
diode to prevent the bubble jet head from overheating.
• Cartridge ID
The BJ cartridge type is recognized through combinations of ID0, ID1, and INKS2.
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BJC-5000
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