The EPIC 1 is the first generation of the SCM.
Basics
These are good SCM's if you don't have a SIMM, as they can take the 29F040 flash chips with a dip switch change. If you have one with a SIMM on it, remove the SIMM and install the chips! Use the SIMM for an EPIC 2 or 3.
The complete schematics are PNG format and are also available as a
pdf
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Station Control Module Epic 1 Schematic Diagram Page 1 of 10
Station Control Module Epic 1 Schematic Diagram Page 2 of 10
Station Control Module Epic 1 Schematic Diagram Page 3 of 10
Station Control Module Epic 1 Schematic Diagram Page 4 of 10
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Station Control Module Epic 1 Schematic Diagram Page 8 of 10
Station Control Module Epic 1 Schematic Diagram Page 9 of 10
Station Control Module Epic 1 Schematic Diagram Page 10 of 10
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Know issues
This is known to have a problem with no or low transmit modulation. This has been traced back to U306 in the audio processing stages on the SCM. It's a MAX292EWE+ available from Digi-Key for about 7 dollars.
Station Control Module Epic 1 U306 Diagram showing part that goes bad resulting in low or no transmit modulation.
