Canon BJC 50 Service Manual - Page 128

Canon BJC 50 - Color Inkjet Printer Manual

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Part 4: Technical Reference BJC-50 4.3.2 Power supply section structure a) Input power supply The voltage input to the power supply section is 13.5 ± 0.5 VDC. It is supplied by two sources: the Universal adapter and the lithium ion battery. When the DC plug is inserted into the power connector, 13 VDC is supplied to the power control section on the control board. b) Vcc1 output The Vcc1 is +5VDC output produced by the DC/DC converter. Vcc1 is supplied to operate the reset IC, ASIC, ROM, RAM, timer IC, EEPROM, and as a pull-up power supply for the POWER button. It is always supplied, even after the power switch is OFF. c) Vcc2 output The Vcc2 (+5VDC) output controlled by the ASIC is used to operate the IC in the print head. The ASIC outputs a signal that turns Vcc2 output off to stop it when the BJ cartridge is replaced, the ink cartridge is replaced, or the printer is turned OFF with the POWER button. d) Vcc3 output The Vcc3 (+5VDC) output controlled by the ASIC is supplied to operate the interface, paper sensor, and HP sensor. When the POWER button is turned OFF with the POWER button, the ASIC stops the Vcc3 output. e) Vpp output The DC input voltage supplied from the Universal adapter or lithium ion battery becomes Vpp output to drive the carriage motor driver and the paper feed motor driver. f) VH output The VH (24.12 VDC ± 0.35 VDC) output generated by the DC/DC converter is supplied to the print head and the paper feed driver. This is monitored by the ASIC. The VH output voltage is supplied to the subheater temperature adjustment driver transistor and the nozzle heater temperature adjustment drivers transistor in the BJ cartridge and the paper feed motor driver. The DCLEV, which is generated by dividing the VH output using a DC/DC converter, is fed back to the ASIC and the ASIC monitors the VH output voltage to be kept at approx. 24.12 VDC. 4-40

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4.3.2 Power supply section structure
a) Input power supply
The voltage input to the power supply section is 13.5 ± 0.5 VDC.
It is supplied by
two sources: the Universal adapter and the lithium ion battery.
When the DC plug is inserted into the power connector, 13 VDC is supplied to the
power control section on the control board.
b) Vcc1 output
The Vcc1 is +5VDC output produced by the DC/DC converter.
Vcc1 is supplied to
operate the reset IC, ASIC, ROM, RAM, timer IC, EEPROM, and as a pull-up power
supply for the
POWER
button.
It is always supplied, even after the power switch is
OFF.
c) Vcc2 output
The Vcc2 (+5VDC) output controlled by the ASIC is used to operate the IC in the
print head.
The ASIC outputs a signal that turns Vcc2 output off to stop it when the
BJ cartridge is replaced, the ink cartridge is replaced, or the printer is turned OFF
with the
POWER
button.
d) Vcc3 output
The Vcc3 (+5VDC) output controlled by the ASIC is supplied to operate the interface,
paper sensor, and HP sensor.
When the
POWER
button is turned OFF with the
POWER
button, the ASIC stops the Vcc3 output.
e) Vpp output
The DC input voltage supplied from the Universal adapter or lithium ion battery
becomes Vpp output to drive the carriage motor driver and the paper feed motor
driver.
f) VH output
The VH (24.12 VDC ± 0.35 VDC) output generated by the DC/DC converter is
supplied to the print head and the paper feed driver.
This is monitored by the ASIC.
The VH output voltage is supplied to the subheater temperature adjustment driver
transistor and the nozzle heater temperature adjustment drivers transistor in the BJ
cartridge and the paper feed motor driver.
The DCLEV, which is generated by
dividing the VH output using a DC/DC converter, is fed back to the ASIC and the
ASIC monitors the VH output voltage to be kept at approx. 24.12 VDC.
Part 4: Technical Reference
BJC-50
4-40