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Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-61
Figure 2-17
System Controller Board, Block Diagram
CPU
The central processor (CPU) is a Motorola MC68302 embedded controller and is
the main controlling component of the projector.
Operation of the CPU is controlled by the program instructions written in the
Program Memory. The program memory consists of two (2) UV erasable
EPROMs (U24 and U63) loaded with the appropriate software for the projector,
mounted in sockets for ease of updating the software. The EPROMs, being non-
volatile, will maintain their integrity under all operational conditions. Upgrading
the program memory is simply a matter of replacing the EPROMs with the newer
version.