JVC 250 service manual Backplane PCB

Chapter 5---Electronics

5.12 Backplane PCB

The Backplane PCB is the spine of the Electronics Module. Every major electronic component in the Model 250 projector connects to and through the Backplane PCB. It is hidden in the inside of the Electronics Module (see Figure 5-2). The System Controller PCB, Raster Timing Generator PCB, Video Processor PCB and the three VICs are connected into it directly. All the other PCBs and Power Supplies are connected through jumpers and cabling.

Troubleshooting on the Backplane PCB

The connectors on the Backplane PCB provide one of the more accessible places to probe voltages and signals that may be useful for troubleshooting purposes (see Figure 5-43and associated list of signals and voltages).

Figure 5-42Backplane Diagram (left side).

5-74 Model 250 Service Manual