Question about Uniden GRANT LT 2-Way Radio

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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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  • 170 Answers

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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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

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

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

1 Answer

My Uniden UM525 is blowing fuses the instant I plug it in. I don't know what happened to it but I'd like to fix it. If anyone has any ideas I'd love the assistance. Thanks in advance,


Hey Marked,

First check the diode in the B+ line . Probably it is shorted due to a reverse polarity connection.

Take it out and test without the diode if it works replace it diode.

Good luck.

Aug 06, 2010 | Uniden UM525 ES Series VHF Radio with...

1 Answer

Blows fuse when connected to power source


reverse polarity diode is burnt or blown. change it.

Jul 25, 2010 | Cobra 29 LTD CB Radio

2 Answers

If my battery runs dead does it blow alot of fuses?


Ah , jump started it eh, you may have reversed the polarity when you connected up. This would damage the radio, the alternator and maybe a diode or two. A voltage spike may have blown the fuse protecting the radio. Look to see if the radio has one. It should anyway.

Mar 20, 2010 | 1983 Ford Econoline

1 Answer

Blows fuse when you plug power in, it is not


Make sure you're connecting the radio with the proper polarity. There is a protection diode inside that will cause the power supply fuse to blow or go into overcurrent shutdown if you have + and - reversed. It's also possible this diode has been shorted. You can't tell by looking at electronic components (unless they are physically damaged) whether they are good. An ohmmeter can be used to test for shorted diodes. Look at the board where the power leads connect for the diode.

Mar 12, 2010 | Uniden PC68XL (40 Channels) 2-Way Radio

2 Answers

My uniden pro510xl when hooking it up imediately blows the fuse like a dead short but if i hook up another radio it will work fine


The radio was probably wired backwards at some point. There is a reverse polarity diode inside that must be replaced to fix this. If you have continued replacing fuses and plugging it back in, there may be further damage such as finals or audio amplifier chip as well. you will need to take the radio to a qualified repairman for service. If it is simply the reverse polarity diode, your bill should not be more than an hour's labor charge.

Feb 06, 2010 | Uniden PRO510XL 40-Channels Base CB Radio

1 Answer

I reversed polarity on my 93 dodge grandcaravan. The altinator is good. the battery keeps a charge till you run it. Tried wiring from altinator to battery and it ran but noticed the interier light 20 amp...


you blew a diode in the altenator by reversing the cables/ it dead. that is why it wont charge. test it at Advance Auto but I am sure thats the problem

Sep 06, 2009 | 1993 Dodge Caravan

1 Answer

Blown fuses probably crossed power leads looking for component to replace have wiring diagraham


no need for wiring diagram just replace the reverse polarity diode. Look at where the power wires come into the radio and you will see a diode. that's the one to change.it should be a 1n4001

Aug 16, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

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