Canon BJC-5000 Service Manual

Also see for Color Bubble Jet BJC-5000 Series: Parts catalog User manual

ECP ModeHost Clk [Input]This signal handshakes with the PeriphAck (BUSY) signal when data is transferredfrom the host computer to the printer. When this signal goes HIGH to LOW, itmeans that the data is output on the data buses (Data 1 to Data 8). The signalgoes LOW to HIGH in response to the leading edge of the PeriphAck (BUSY) signal.Reverse data transmission phase:This signal remains HIGH.Data 1 to Data 8 [Input/Output]This signal is used as an input signal when data is transferred from the hostcomputer to the printer.Reverse data transmission phase:This signal is used as an output signal and the printer outputs data to the hostcomputer using these data buses.Periph Clk [Output]This signal remains HIGH when data is transferred from the host computer to theprinter.Reverse data transmission phase:This signal goes HIGH to LOW to indicate that data is output to the host computer.The signal goes LOW to HIGH in response to the leading edge of HIGH pulse of theHostAck (AUTO FEED XT) signal of the host computer.Periph Ack [Output]This signal goes HIGH to LOW when the printer is ready to receive data from thehost computer while transferring the data from the host computer to the printer. Itgoes LOW to HIGH when the printer receives data from the host computer.Reverse data transmission phase:Indicates whether the data sent from the printer to the data bus is a command ordata. (LOW: Command, HIGH: Data)Ack Reverse [Output]This signal remains HIGH when data is transferred from the host computer to theprinter.Reverse data transmission phase:This signal remains LOW.The Reverse Req (INIT) signal is a switching request from the host computer whichgoes HIGH to LOW to request a switch from the forward data transmission phase tothe reverse data transmission phase. In response to the falling edge of the ReverseReq signal, Ack Reverse signal goes HIGH to LOW to indicate that the switchingrequest has been accepted.When the switching from the reverse data transmission phase to the forward datatransmission phase takes place, Ack Reverse signal goes LOW to HIGH to indicatethat the switching request has been accepted, in response to the leading edge of theReverse Req (INIT) signal which is a switching request from the host computer.X flag [Output]This signal remains HIGH in the ECP mode.Host Ack [Input]This signal goes from LOW to HIGH when data is transferred from the hostcomputer to the printer.Reverse data transmission phase:This signal handshakes with the Periph Clk (ACKNLG) signal. When the hostcomputer is ready to receive data from the printer, this signal goes HIGH to LOW.After the data is received, the signal goes LOW to HIGH.BJC-50002-16Part 2: Product Specifications