Canon BJC-55 Service Bulletin

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

Canon BJC-55 Service Bulletin Manual pdf 15 page image

COMP. SYSTEMS - 15 - PRNT-8966. TECHNICAL REFERENCE6-1. 5V Power Supply Circuit ChangeThe signal lines for obtaining head information (HRANK signal, ID0 signal, ID1 signal,HCONT signal, and HDIS signal) are common with the power resource "Vcc1" for theLogic Board IC of the BJC-50/50v. The Vcc4 power resource circuit has newly beenadded as a 5V power resource of the BJC-55/BJ M40 for the signal lines for obtaininghead information.The Vcc4 is the sequence which goes ON periodically, and only at soft-power-on. As aresult, the load to the print head caused by applied voltage has been reduced.<5V/3V Power Creation Circuit Block Diagram>+5V DCPower Source: Sensors: BJ cartridge(Logical power source):MPU, EEPROM, DRAMPrinter ControllerMotor DriverControl ROM: USB InterfaceRegulator(IC17)DC/DCConverter(IC4)Newly-assigned circuitV2-ONV3-ONPrinter Controller( I C 6 )Vcc1 (+5VDC)Vcc2 (+5VDC)Vcc3 (+5VDC)3Vcc (+3.3VDC)Vcc4 (+5VDC):For obtaining head informationV4-OFFAmplifierCircuitDIAID0ID121191817201Vcc4Vcc4Vcc4CNH1TOPID0ID1IHKS2DIKHRANKHDISVcc4HCONT