Electrical System; Input Power Supply (Ac Adaptor); Output Voltages - Canon QY8-1360-000 Service Manual

BJC-7100

4.3 Electrical System

4.3.1 Input power supply (AC adaptor)

The AC adaptor supplies the voltages to the printer power supply circuit.
The AC adaptor outputs three DC voltages: Vcc: 5.0VDC, BJ head drive VH: 20VDC,
motor drive VM: 27.6VDC.
The AC adaptor is mounted on the back of the printer so that the DC output pins of
the AC adaptor align with the DC power cable of the printer.

4.3.2 Output voltages

1) Vcc (5±0.25V)
The Vcc supplied from the input power supply is used as the pullup voltage for the
POWER button, and to drive the beeper. In addition, the Vcc is distributed as
+5VDC power to the MPU, printer controller, EEPROM, control ROM, DRAMs, motor
driver, and other ICs such as the reset IC, and for operating the ink-out detection
circuit. (VDDH, Vcc2, Vcc3, Vcc4, Vcc5, Vcc6)
2) VH (20±0.3VDC)
The VH is supplied to the print head.
The VH output voltage is supplied to the BJ cartridge subheater temperature driver
transistor and driver transistors in the nozzles.
3) VH (27.6±1.5VDC)
The VM is output as is and used to drive the carriage motor driver and paper feed
motor driver.
1 3 5 7
2 4 6 8
Figure 4-33 AC Adaptor Output Voltages
4-45
Part 4: Technical Reference
1 20.0V 5 5.0V
2 GND 6 GND
3 27.6V 7 VHON
4 GND 8 GND