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Repairing Motorola MaxTrac Radios - repeater-builder.com
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-repair.html
No transmit audio or no transmit activity at all (not even the TX LED lights up) could be caused by a bad microphone, a bad RJ45 mike jack, or bad wiring between the Front Panel and the Logic board. Substitution of any of these assemblies will quickly tell you where the problem is.
Motorola MaxTrac / Radius / GM300 Index Page
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-index.html
MaxTrac Detailed Service Manual 6880102W84, was about $30 but is no longer available (NLA). This is the low band, high band, UHF, and 800 MHz MaxTrac service manual that covers the MGA, MJA, MQA, MWA and AHA models. If you ever pop a cover on any of those models then you want this book on your shelf; it's chock full of good stuff.
Motorola Maxtrac Question | RadioReference.com Forums
https://forums.radioreference.com/threads/motorola-maxtrac-question.1625/
Yes, if it's a 16 pin accessory plug. Two terminal pins need to be connected together for the internal speaker to work. For external speaker, one of the two that are connected for the internal speaker and the audio low terminal need to be used. Go to Batlabs.com and look under specific model info for Maxtrac or GM300 and you'll find the info ...
Motorola MaxTrac, Radius and GM300 Series Introductory ...
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-intro-stuff.html
1) No matter WHAT the model tag says, no MaxTrac, Radius, M-series or GM300 mobile will ever operate over the entire frequency range listed on its model tag / label. Each unit will do only a portion of that model tag frequency spread, called a "split", a "bandsplit" or a "range".
Adding Flat Transmit Audio to a 5-pin MaxTrac
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-flat-tx-audio.html
The 16-pin logic boards already have a provision on the 16-pin Accessory Connector for microphone audio on pin 2 or flat TX audio on pin 5. The 5-pin logic boards have no external microphone audio input, so the only way to feed audio into these radios is to use the front-panel RJ45 microphone jack pin 5 or wire up a cable and let it hang out of the radio.
Motorola maxtrac | RadioReference.com Forums
https://forums.radioreference.com/threads/motorola-maxtrac.386685/
You might look at the firmware PROM. Some people have changed Maxtrac's to be Radius in order to use the accessory connector for remote channel change. Kind of a BCD channel change. The Maxtrac firmware doesn't do it. Maxtrac should be 5.36 or lower, Radius would be 21.01. Its a longshot, but worth a look.
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