Question about Uniden GRANT LT 2-Way Radio

1 Answer

Blown fuse and reverse polarity diode

Changed them both in a uniden grant still dead

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  • Anonymous Jan 26, 2009

    radio is dead no transmit or recieve just keeps blowing fuses

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Check around the pcboard where the dc goes to the board, sometimes the foil will burn. Also chec the transformer, Chec that one of the wires did not come off the plug in the back. When you replaced the protection diode did it blow again? If not keep checking for opens on the pc board. When you said it was dead do you mean no lights at all or no tx and rx?

Posted on Jan 26, 2009

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Posted on Jan 02, 2017

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Related Questions:

1 Answer

What is the main function of a reverse polarity diode, what would happen if it was blown


Hi,
a diode in reverse polarity could be used e.g. for protecting some circuit against improper polarity of supply. It could be connected in serial - but it is in forward polarity - (disadvantage: voltage drop) or in parallel - reverse polarity - with a fuse in serial to supply. This way is often used with Zener diode - protection against overvoltage in addition. Try to google e.g. "how to protect against improper polarity". For this type of protection could be used special types od diodes - transils - they could be one- or bidirectional. In case of a diode failure, the supplied circuit may not work - it depends on the way of diode connection and type of its failure - short circuit or disconnection. But there is many diode application: try https://en.wikipedia.org/wiki/Diode https://en.wikipedia.org/wiki/Diode#Applications
Jiri

Apr 24, 2017 | Radio Communications

1 Answer

Why does the uniden grant go into transmit mode when turned on


if this happens without a mic attached, it is common for the tx/rx switching transistor to fail

Aug 16, 2014 | Radio Communications

1 Answer

Does anyone know how to wire a turner + 2 to a uniden grant?


that combination isn't possible without changing the cord and doing a major rewire of the mic

Apr 24, 2014 | Uniden PC78ELITE 40-Channels Base CB Radio

1 Answer

Uniden grant cb radio


You can't You need a spectrum analyzer to set the frequency correctly. This is not something you can do by ear. When you go poking around inside with a screw driver, you can mess up the entire radio.One adjustment will affect other adjustments. That's why there are radio repair shops. Just take it to one.

Jan 23, 2014 | Radio Communications

1 Answer

I need a wire harness for my grant lt cb radio


Hi,

My only suggestion is to go to your nearest Radioshck or similar store, as they are the people that stock this kind of gear.

Cheers,
Peter

Dec 30, 2012 | Uniden Grant Cb Radio

1 Answer

What would cause my magnum 257 not to power up or turn on?


the power wires not being heavy enough.blown fuses reverse polarity diode blown. overpower diodes blown.lean towards the overpower diodes.

Jul 01, 2012 | Radio Communications

1 Answer

I am looking for a diagram of schematics for my uniden grant cb. qny help?


I have not checked the similarity of it but with the Grant LX which i have the older Cobra 148 are near clones.
http://www.cbtricks.com/radios/uniden/grant_lt/index.htm

Hope this helps

Sep 03, 2011 | Uniden GRANTLT 40-Channels Base CB Radio

1 Answer

My radio would not turn on yesterday. I have checked the fuse and fuse connections. The fuse was black, so I put a new one in. The fuse connections were good. The connections to the battery are good, the...


The black fuse means it blew from a fast, heavy short circuit instead of an overload of some sort. The high current vaporizes the wire inside and coats the glass, giving it the black look. In an overload, the fuse link melts.

A common cause is failure of the reverse-polarity diode in the radio. It's there to cause the fuse to blow if you get the battery connections backwards when hooking up the radio. The diode can short, and this will cause the blown fuse. If you check the fuse and find it's black again, you should check the diode with an ohmmeter. Look for the diode near where the battery lead connects to the circuit board in the radio.

Aug 02, 2011 | Uniden Solara - VHF Marine 2-Way Radio

2 Answers

I have a uniden Grant like to wire up a 4 wire D104 the mic has white black red shield


Wiring 1 4 pin D104 mic to a Uniden Grant CB is as follows -
  • Pin 1 - Shield - Shield
  • Pin 2 - Audio - White
  • Pin 3 - Transmit - Red
  • Pin 4 - Receive - Black

Regards, Tony

May 05, 2011 | Uniden GRANTLT 40-Channels Base CB Radio

1 Answer

Uniden grant lt transmit and receives normally but when i key up on AM the AM power regulator gets hot quick i changed out the driver and final and replaced the regulator still does the same thing and it...


Sounds like a "short" if it affects modulation + power. Try to inspect board with magnifier for solder bridges, and bad resistors. Change a few resistors near back with new ones. take out slugs near back finals like L10 or L20's not sure if its same as Uniden Pc68xl. but try that. I found turning L19 up to top gave great Modulation. clip D9, Sread coils 1/16 inch in back. Try to get lower carrier. Carrier does not mean anything much. Modulation is what you need. With less Carrier it may cool down that chip. It may be too wound out.

Mar 26, 2011 | Uniden GRANT LT 2-Way Radio

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