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To control normal/reverse selection from outside, provide a switch between clock terminals
1 and 3.
When the [cut land REV] is cut, the operation is changed as follows:
The internal demodulator becomes a space demodulator. The TTL. IN is changed to mark
H, space L input.
When changing CLOCK terminal to TTL OUT terminal:
Cut the [CUT land CLOCK] and bridge the [Bridge land TTL OUT] with solder.
When thus changed over, pin 2 of clock terminal delivers the output of built-in demodulator
and the clock output of 4,800 Hz adjusted at the time of shipping is cut off.
