JVC 340 SC, 330, 370 SC service manual System Controller Board P/N 104668 SCB

	Chapter 2—Functional Description
	System Power Supply
Inputs	Description
+107V	Power supply to cathode drive amplifier.
+6.3V	Power supply to filament.
+15V	Power for analog components.
-15V	Power for analog components.
GND	Return for power supplies.
ARC GND	Low impedance return path to HVPS for arc currents.

System Controller Board P/N 104668 (SCB)

The system controller board plugs into the electronics card cage. It is the middle board in the card cage (third from the front).

The following functions are provided by the SCB:

Operator Interface:

IR Interface.

RS232 Interface.

On-Screen Menus.

Dot Matrix Display.

Inter Board Communications and Control:

IIC Bus (Overall system control).

Serial Bus.

Power Supply Interface.

Projector operation:

Direct operation of the projector by issuing commands based on external directives and internal information.

Contains program and working memories.

Generate Overlays:

Digital Test Patterns.

Gray-Scale.

Provide Convergence Correction Outputs:

X and Y Axis Correction.

Sensitivity and Threshold Correction.

The block diagram (see Figure 2-17) description, along with the I/O description in the section following, provide information to perform module-level troubleshooting.

Model 330, 340SC and 370SC Service Manual 2-59