Question about Uniden Radio Communications
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?
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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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
Tips for a great answer:
Aug 30, 2015 | Motorcycles
Aug 17, 2014 | Uniden 2SC1973 Transistor for Grant and...
Aug 16, 2014 | Radio Communications
Mar 08, 2014 | Uniden GRANTLT 40-Channels Base CB Radio
Oct 23, 2013 | Radio Communications
Oct 12, 2013 | Radio Shack TRC-447 CB Radio
Jan 30, 2009 | Cobra 148 GTL 120-Channels Base CB Radio
Feb 28, 2008 | Audio Players & Recorders
113 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: