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Uniden grannt xl will not transmit

I have a 17 year old uniden Grant XL. Some days it will transmit sometimes it will not. I can't link the problem to temperature, moisture, vibration, solder joint, or a cracked board. The mic is OK. The am regulator, final and driver on the back of the radio have been replaced. The audio chip on the side of the radio has been replaced. TA7222P and the voltage regulator on the side of the radio near the audio chip checks out OK also. I noticed the meter will go in the wrong direction when the mic is keyed when it does not transmit. What other components do I need to check? It's a great radio when it works. Is there someone who can help me with this problem?

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I can tell you that mic wires can simulate that problem when they accidently touch or ground out. Sometimes a ground is loose or capacitor leaks. Check standing wave ratio. SWR 1.5 or less prefer 1.2 or 1.3 read. Antenna cables replacement and new ends. Dirt in mic switch. Mine did this with a power mod capacitor
near final(without proper discharge 100 ohm resistor). I turned back power to 1 1/2 watts to 4 swing a Tx tuning slug *redpaint on it. I let it talk on low key an when i speak it jumps to 4 or 5 watts on meter. When a mod has been done some people don't know that capacitors discharge and it will leak back current. Thats why on a Cobra/Uniden company radio the instruction properly call for a 100 ohm resistor to be placed in parallel with Capacitor near final on bottom of circuit w/ capacitor on top spkr side(i call it top its on spkr side bottom when radio is upright (super mod kit). Or replace jumper J1 to factory deadkey of 4 watts and see no swing in talk except to 4.5 watt slightly(factory tune)

Posted on Jul 22, 2013

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SOURCE: Uniden Grant XL No Transmit

on the back of the radio you will see a small circuit board with a transistor on it this is your am regulator.check to see if that has gone bad

Posted on Feb 02, 2009

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on the back of the radio you will see a small circuit board with a transistor on it this is your am regulator.check to see if that has gone bad

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Need manuel


I am assuming this is a CB radio, and i've found a manual for the LT model, found below, but not the XL. It takes you to Uniden's website. You may have to contact them directly if this doesn't help you out. If you haven't already, check the label on back for the model #. It may be listed that way, as there are some XL models listed.

http://www.uniden.com/index/manuals_results.cfm?cat=5

Good luck, and please remember to rate my advice.

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