I. CONTROL PANELA. OutlineThe machine’s control panel consists of the control panel controller PCB, 320 × 240-dot liquid crystal display panel unit, transparent touch panel, and key switch panel, andit has the following functions:q Data communicationw LCD processinge LCD contrast automatic and manual adjustmentr Touch switch inputt Key switch inputB. Operation1. Data CommunicationThe control panel controller PCB communicates with the copier’s image processorPCB through an interface unit to exchange data in serial mode.The communication is controlled by the microprocessor on the control panelcontroller PCB.Figure 7-101LCD panel Input key, VR911,display LEDControl panel controller PCBDC controller PCBDisplaymemoryLCDcontrollerInterfaceunitCOPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS7-1
