JVC 250 Service Manual

Contents

Chapter 5---ElectronicsModel 250 Service Manual 5-9Figure 5-6 Power On timing sequence.Normal Operation FunctionsDuring normal projector operation, the System Controller PCB receivescommands through the remote control, tethered remote control, or a PC.Commands issued from the IR remote controls are received through IR Detectorslocated on the front and rear of the projector. Commands issued from a PC,Laptop, or Tethered Remote Control are received through the RS-232 serialinterface ports.The two RS-232 ports, labeled Terminal-in and Control-out, are functionallyalmost identical. Both ports can be used to interface with computers, switchers, orother remote controlling devices using a null modem cable. The difference is,importing and exporting of configuration data can only be performed through theTerminal-in. The dipswitch on the back of the System Controller PCB controlsthe baud rate (see Figure 7-2).The System Controller PCB enables the Video Processor PCB to select betweenan internal and external source through the OVERLAY signal. The System