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wires hanging out of radius m1225

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BJ_NORTON

BJ_NORTON

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Joined
Dec 19, 2002
Messages
407
Location
Las Vegas
I got a used radius m1225 with attached power supply off of ebay the other day.


The listing said the radio would power up, but he couldn't test anything else, so it was sold as not working/for parts. I was mostly interested in getting the astron power supply to power a 25w maxtrac, so I figure if the radio works its just a bonus for me!

The radio has 2 wires coming out the back and to a switch on the side that says on off.


The wires go under the cover and are soldered to an IC inside the radio



Any ideas what this is for? The switch was broken when I unpacked the radio, so I'm not sure what it does. Initially I thought maybe it was to turn the internal speaker on and off, but ch3 of this radio is programmed to the NWS and I can hear it just fine.

Also, the radio is a M33DGC90E2AA, which I believe means its a 25 watt VHF radio. Is there any way to tell the band split without using the RSS?

Thanks for any help!

BJ
 
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DPapay

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Joined
Jul 5, 2007
Messages
351
Location
Morris County, N.J.
That is definitely the audio ic, the pins appear to be connected to pins 2 and 7 or 8. Pin 2 is ground, pin 7 is unswitched power before the green pico fuse you see in the pic. That does not make sense. Pin 8 appears to be a circuit to switch the audio ic on and off. Maybe they wanted to mute the radio with this switch?
 
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