Board Descriptions A - 30 OF 5300/5600 Serv Man, P/N 59278301A3.2.9 M17 Circuit Diagram1. Block diagramThe circuit diagram consists of connector CN2 that provides an interface between M17board and LED print head.Figure A3.2.12 shows the related signals and block diagram of LED print head.2. FunctionData of 1664 LEDs on the LED print head is loaded into the shift registers by the HCLCK(6.67 MHz) signal. After the 1664 bit (208mm) data is loaded in the shift registers, it isthen loaded in the latch circuit by the HLATCH signal. The turning -on and off of theLEDs are controlled by STRB1-N to STRB4-N signals.LED head interface signals output from IOGA• HDATA 0: Print data i.e., data to be printed• HCLCK: Transfer clock for print data (6.67 MHz/10MHz)• HLATCH: Latch signal for print data• STRB1-N to STRB4-N : LED head strobe signalsShift registerLatchStrobeCN286910, 11, 12, 131, 23, 45, 14+5 V0 VLED1664 bits (208 mm)LED print headM17HCLCK (6.67 MHz)HDATAHLATCHSTRB1-N to STRB4-N0 VP+5 V0 VIOGAIC2Related Signals and Block Diagram of LED Head (Figure A3.2.12)Rev. 2
