JVC 250 service manual 6 Power On timing sequence Normal Operation Functions

Chapter 5---Electronics

Figure 5-6Power On timing sequence.

Normal Operation Functions

During normal projector operation, the System Controller PCB receives commands through the remote control, tethered remote control, or a PC. Commands issued from the IR remote controls are received through IR Detectors located on the front and rear of the projector. Commands issued from a PC, Laptop, or Tethered Remote Control are received through the RS-232 serial interface ports.

The two RS-232 ports, labeled Terminal-in and Control-out, are functionally almost identical. Both ports can be used to interface with computers, switchers, or other remote controlling devices using a null modem cable. The difference is, importing and exporting of configuration data can only be performed through the Terminal-in. The dipswitch on the back of the System Controller PCB controls the baud rate (see Figure 7-2).

The System Controller PCB enables the Video Processor PCB to select between an internal and external source through the OVERLAY signal. The System

Model 250 Service Manual 5-9