| Ref. | Description |
|---|---|
| N | Mounting/transceiver interconnect (external) |
| O | Audio connector (external) |
| P | Control box/mounting interconnect (external) |
| Q | Receiver fuse (2A) (external) |
| R | Transmitter fuse (6.3A) (external) |
| T | Transmitter RF |
| U | Receiver RF |
| V | Modulator amplifier, 1600 Hz tone generator, and 11.5 MHz discriminator for automatic frequency control (AFC) of transmitter |
| W | Audio amplifier |
| X | Receiver power supply and control amplifier |
| Y | Frequency synthesizer (also used in SEM-35) |
| Z | IF (Intermediate Frequency) module (also used in SEM-35) |
| AA | Plugs for test box |
| BB | 10-frequency crystal oscillator |
| CC | Receiver servo |
| DD | Transmitter servo |
| EE | Transmitter power supply |
| FF | Motor drive power supply for external antenna tuner |
| GG | Relays for interconnect of multiple transceivers |
| HH | 600 ohm balanced audio connections |