Canon BJC-55 Service Bulletin

Also see for BJC-55 Series: Service manual User manual Start here User manual Specification

4.3.2 Power supply section structurea) Input power supplyThe voltage input to the power supply section is 13.5 ± 0.5 VDC. It is supplied bytwo sources: the Universal adapter and the lithium ion battery.When the DC plug is inserted into the power connector, 13 VDC is supplied to thepower control section on the control board.b) Vcc1 outputThe Vcc1 is +5VDC output produced by the DC/DC converter. Vcc1 is supplied tooperate the reset IC, ASIC, ROM, RAM, timer IC, EEPROM, and as a pull-up powersupply for thePOWER button. It is always supplied, even after the power switch isOFF.c) Vcc2 outputThe Vcc2 (+5VDC) output controlled by the ASIC is used to operate the IC in theprint head. The ASIC outputs a signal that turns Vcc2 output off to stop it when theBJ cartridge is replaced, the ink cartridge is replaced, or the printer is turned OFFwith thePOWER button.d) Vcc3 outputThe Vcc3 (+5VDC) output controlled by the ASIC is supplied to operate the interface,paper sensor, and HP sensor. When thePOWER button is turned OFF with thePOWER button, the ASIC stops the Vcc3 output.e) Vpp outputThe DC input voltage supplied from the Universal adapter or lithium ion batterybecomes Vpp output to drive the carriage motor driver and the paper feed motordriver.f) VH outputThe VH (24.12 VDC ± 0.35 VDC) output generated by the DC/DC converter issupplied 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 drivertransistor and the nozzle heater temperature adjustment drivers transistor in the BJcartridge and the paper feed motor driver. The DCLEV, which is generated bydividing the VH output using a DC/DC converter, is fed back to the ASIC and theASIC monitors the VH output voltage to be kept at approx. 24.12 VDC.Part 4: Technical Reference BJC-504-40