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Diode d702 and d703 marked on the board , wondering if i could match up these diodes and find parts .. hooked the amp backwards and it blew them but amp still works

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I hooked the battery cables up backwards and it blew the magneto hooked the cables back the right way and it blew the magneto again the model#21R707-0011 10.5hp 344c


This doesn't sound like a car, but more like a riding mower or something.

Anyway, is it the magneto that "blew" or a fuse for the magneto? You don't mention that you replaced the magneto....

Some manufacturers incorporate reverse protection diodes that are supposed to cause a fuse to blow if the battery is hooked up backward. Unfortunately, the diode often becomes a short circuit when this happens and would explain why a primary fuse would blow again, even when the battery is hooked up correctly. If you have a wiring diagram for what you're working on, I'd suggest checking for a diode connected near the battery cables. If you don't have a wiring diagram for this, you're probably going to need one.

Oct 15, 2016 | Cars & Trucks

1 Answer

Hooked power up backwards on amp


Likely there is a reset period for an internal safety. If you can open it up you will find either something obviously burnt or it's probably O.K. A "diode" only lets power go one way. If reversed it shouldn't fail. More likely fried resistors. Too small to see if they're inside a chip, but easy to see if soldered on a circuit board. The color of the stripes on the resistor indicate it's exact type.

Apr 09, 2015 | Car Audio & Video

1 Answer

447 will not take power from power suply


  • 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.

  • Hope this helps.

Oct 31, 2011 | Radio Shack TRC-447 CB Radio

2 Answers

Hooked my general lee up backwards heard a pop...what could it have been?


Hi looks like youve blown what we call the dummy diode at rear of radio this will have to be replaced although you can remove this yourself if you need it working pronto so firstly remove both covers of rig ,look closely at circuit board at the rear on the right hand side as you look you will see a black diode with silver stripe remove this ,your radio should operate fine now ,but please make sure you have it replaced as soon as possible as this protects your rig from damage goodluck

Oct 30, 2011 | Connex 3300 240-Channels Base CB Radio

1 Answer

Hi I have found a blown diode on the board in the back of my Reilsys RLT32AG20, marked DE008, but the diode is too badly damaged to identify it, are you able to help? Ricky


vishnuswamy_20.jpghttp://assets.shopjimmy.com/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/p/0/p0607110395.jpg

click above link ....you will get power supply unit 's photo ...... above shown photo is from that picture ...... so only this much information is available about that diode (DE008) ..... i think the letters that we can see on that diode are R G S D ........... so using these letters & size of diode (click link) just carefully observe other diodes( if required remove & check ) on your main board .... if it matches then check its value .......... or from the below shown link you will get seller address ....so contact them & see if anyone there can help you in finding its number......
all the best.

Aug 19, 2011 | Televison & Video

2 Answers

Battery got hooked up backward on jump start now somthing drains battery overnight


You blew a diode in your alternator when you hooked up the battery backwards. You need to get your alternator repaired. The parts are not expensive.

Feb 17, 2011 | 1986 Ford Bronco II

1 Answer

When i hook up my cobra 29 Ltd to my pickup it keeps blowing fuses, red to postive and black to negative..Cannot figure out whats wrong


You have hooked your power wire up backwards at some point and blown the polarity protection diodes.

This requires opening the radio and using a soldering iron to remove and replace the blown diode.

You will need:
  1. Soldering Iron
  2. Solder
  3. De-soldering braid
  4. N1004 diode or better.
  5. Phillips head screw driver.
Using the phillips head screw driver to take the bottom cover of the radio off being careful of the speaker wires. Using the soldering iron, heat the solder on the tabs of the speaker and pull off the wires. No need to use the de-soldering braid to remove the solder. You should do this to make it easier to handle the radio, and to avoid damage to the speaker or wires etc.

Now take the cover off the top of the radio. This will reveal the "Trace" side of the board. This is where all of the components are soldered to the board.

Now flip it to the other side where you can see all of the components and wires etc. Look at the back right of the radio by where the power socket is. Look for D23. its a big black diode. It will most likely be black and burnt. Some times it may not be.

Here is the tricky part. You need to locate the points at which this component marked D23 is soldered to the trace side of the board. Some times you can use a bright light and look at the trace side of the board while the light shines on the other side to locate the part.

Once you have located the points at which the diode is soldered too, do not de-solder it yet. Make note of which side of the diode the white band is on. This is important, putting the diode in with the wrong polarity will make the radio not work.

After you take note of the white band you may now use the de-soldering braid to remove the solder from the trace side of the board. To do this, place the braid over the solder point. put the tip of the soldering iron on the braid and press it down to the solder point. You will see it **** the solder into the braid.

Once the solder is off both solder point, flip the radio and remove the bad diode.

Put the new diode in, making sure the white band is on the same side as the original diode.

Once again flip the radio over to trace side of the board and solder the new diode in. To do this place the tip on the solder point, making sure to touch both the solder point of the board and the wire from the diode. take the solder and touch it to the solder point, not the soldering iron tip. Once enough solder is on the point you can remove the soldering tip. Don't use too much solder.

Once both points have been re-soldered, solder the speaker wires back to the speaker. Red is positive, it connects to the tab marked by the positive symbol "+". The white wire is negative. It goes to the negative symbol, "-". You can just reheat the tab, and put the end of the wire into the melted solder and remove the solder tip while holding the wire in place until it cools enough harden again.

After the speaker is re-soldered, Put the covers back on. Now be very careful hooking up the radio to power. If you hook it up backwards again it will blow the diode again. Once the power wire is connected, turn on the radio, it should work fine at this point.

Good Luck!

Oct 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

Car Battery Charger - Repair


thats what i did on mine they blew when i hooked the cables up backwards (gotta watch that)
but i used 130 amp alt diodes from an old tractor alt i had

Jul 03, 2009 | Kitchen Appliances - Others

1 Answer

Just bought cobra 19 dx and wont even turn on


if you hooked it up backwards first, you blew the protection diodes in the radio. they need to be replaces.

You need to unsolder the old one and put in a new one.

You need to make sure you don't hook it up backwards ever.

Check fuse too!

Open the bottom cover, watch the wires from the speaker as not to pull them out.

Look towards the back right of the radio for a black diode that is burned up. If you have 1 that is burnt, then go to radio shack and get a diode 1n4007. then replace it with that.

And, be careful next time you hook it up.

Jun 12, 2009 | Cobra 19 DX IV CB Radio

1 Answer

Tv help


Symptom: PICTURE PULLS
Cause: DEFECTIVE D702,D703,D704
Symptom: DIGITAL CONVERGENCE WON'T ADJUST
Cause: DEFECTIVE DCU

Jan 14, 2008 | Hitachi 50SBX70B 50" Rear Projection...

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