The other side of the LED is connected to the +12-volt supply. It’s a simple circuit, with a transistor connecting the cathode of the front panel OT LED to ground through a 680 ohm resistor. It is located on the top right-hand side of radio near the back. Starting with the offset tuning LED, I discovered that the voltage for it is developed on the 80281 OT-TR Board. Replacing a “DED” (Dark Emitting Diode) Replacement OT LED Ten Tec really wanted to enable their owners to service their own radios. In addition to that, voltage measurements are provided for each pin of each board, in both transmit and receive modes. The manual is much larger though, including complete circuit descriptions and alignment procedures for each circuit board in the modular radio. The Triton IV is simple to operate and requires only a few pages of operating instructions. One great thing about Ten Tec products are the manuals that come with them. Strange sounds issued from the speaker at times. The “Offset Tuning” (OT) LED didn’t work, and more seriously, the transceiver didn’t always mute in transmit. I also mentioned making a cosmetic restoration, but after using it in the shack for an evening, it was apparent there were other problems. I n the last post, I described a used Ten Tec Triton IV (aka Model 544) and addressed the most immediate issues.
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