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M1225 jumpers
- Thread starter W5JG
- Start date
So you jumpered Ext Spkr (-) to Mic Audio In. Here is the Service Manual:
Have you studied the circuit to see what might happen? Shouldn’t be too hard to figure out.
You might tell us if something seems to not be working correctly. Do you think the audio amp is blown? Are you not getting any mic audio at all, some audio is going through but severely attenuated, audio is distorted, etc.? Is the speaker audio okay? Stuff like that will help.
Just asking a hypothetical question may not be the best way to approach this. A tech or engineer familiar with the Motorola M1225 will have the best shot at answering your question with some additional information and what you have done in the way of troubleshooting.
The short answer is… Yes, it’s possible.
Is that what actually happened? That is an unknown right now. With more information and by studying the Service Manual, whatever might have happened by jumpering pins 1 and 2 can hopefully be figured out. At least you will know what to start looking at in the way of troubleshooting. There is also the possibility that nothing happened by jumpering pins 1 and 2. If something still is not working, it could have a pre-existing fault prior to the jumpering error. Is that possible?
I didn't do it. I sold a radio to a local Amateur. He says neither the internal speaker or an external speaker works (no audio at all). It's been a few years, but I know that it did work. The radio has been in a plastic storage bin since I last used it.
He used an online picture of a different radio, and jumpered what he thought was pins 15-16. Turns out it was 1-2.
He used an online picture of a different radio, and jumpered what he thought was pins 15-16. Turns out it was 1-2.
Last edited:
mmckenna
I ♥ Ø
Those use BTL audio amplifiers, and grounding or otherwise abusing one of the speaker output pins can damage them.
That's sucks that he did that to the radio, but I'm hoping he's not expecting a refund.
That's sucks that he did that to the radio, but I'm hoping he's not expecting a refund.
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