Stupidly I plugged it into a wall outlet and, of course the fuse blew. I can't find a 2A 125V fuse. Only a 2A 250V. No power. I connected the wires to a cigarette lighter plug. No power. I tried it touching the two ends without a fuse. Still no power. If the fuse blew, isn't the unit still protected? Suggestion?
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Re: radio shack cb radio 21-1703
OK. I do not know the exact number for the diode off hand, because I don't have the same radio in front of me. On most cb radios, this diode is usually located on the component side of the pc board, close to where the positive lead solders to the board. Most of the time when it burns, it just becomes brittle.
If you do replace it on your own. The diode is called a rectifier diode, which you can pick up at radio shack or at partsexpress.com. The part number is between 1N4001 to 1N4008. When installing be sure to observe polarity, making sure that the side with the silver band is facing the direction of the arrow.
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Hi Jack , little pun. the radio should come on no matter what. Take the radio ( no coax ) plug it into the wall ,now see if it comes on. Look in the back to see if its on AC or DC. Which ever way it is turn it the other way. If the radio doesn't come on you should open the radio and look to where the power cord come in for DC. there is a diode there called a reverse polarity diode. It is probably a 1n4003 but check it anyway to see if its burnt. If it is replace it and the radio should come on . Also check the fuse .
If you have an inline fuse make sure to check and replace it if needed. If the radio was hooked up backwards then you need to go to radio shack and pick up a replacement diode. 1N4001 will be the diode you need. It allows current to travel one way but not the other. When you hooked the radio up backward it blew, like a fuse. Here is the diode at Radio Shack. http://www.radioshack.com/product/index.jsp?productId=2036268
When you pull the bottom cover off you will see this diode in the board right by the power cord connector for the radio. Most of the time they will be chipped or even split after blowing from reverse polarity. Pay attention to the little "arrow" on the diode because there is a negative and a passive to diode. Anode and Cathode as it were. The Anode flows to the Cathode. The "tip" of the arrow is the negative side.
Look with a flashlight to insure you did not blow a tracer too.
For the Radio Shack TRC-447 this is just a standard 3 PIN DC cord. Many CB's use the same cord and they are interchangeable. Some Cobra, Uniden, Radio Shack use the same cord. Texxcomm is a great place to get parts from.
That radio needs a MIN.4 A. Fuse. If the output has been torqued you will have to use a 5 A.fuse..However, the metalic smell tells me that you may have hooked the power leads backwards ?" ? They don't loke that one little bit ! ! Too bad....those were good radios axdn the President Grant is the same chassis< the latter has some minor diff's, but all parts are interchangable. Back to above...be sure the power is correct and do try new larger fuses. Good luck
Is the pwr supply the one that blew. if so that is a fullwave bridge rectifier. around 40-45amps that is what makes the AC wall volts from transformer into the 28volts DC to run the power transistors in the rear on the heatsink.
First, use an ohm meter and test the power wires for continuity. If they test good then there is a protection diode on the board that is probably blown. If I remember right it is a 1N4001 diode. Generally you can see if its blown as it will either be burnt or look like its cracked. If it is you will need to replace that diode to restore power.
go to sturdevants auto (or possibly another auto store, but i got mine from sturdevants) and get a single to double outlet adapter. make sure it has separate wires to each one, then wrap it around the nearest knee pad support thing to make it stay in place. works great for me. the wires on mine are about 6 inches to each new outlet.
It,s the mounting the screws are touching something in the radio when bracketed and yes you probably blew the power diode in the radio, it can be fixed pretty easily. Try a fuse on the ground and the hot next time.