Question about JVC MX-GB6 CD Shelf System

4 Answers

As soon I turn on the fuse 5amp 250 blow

I just replaced diodes d212 d213 d213 d214 the first time I use big solder a damage the cuircuit I missing you conect 2 diodes is look paralel and the anoter back resolve only 6 vollts do send me the skuematic of this power suply thak you

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  • colemansanti Dec 21, 2008

    i NEED THE SET UP THE FOUR DIODES D113 TO D214 WHAT CLASS OF CUICUIT DOUBLE BRIGDE OR WHAT AC DC COMING THRU 5 AMP FUSE

  • colemansanti Dec 21, 2008

    i ASSUME IS MAIN BOARD

  • colemansanti Dec 21, 2008

    NOTHING YET NO HELP

  • colemansanti Dec 21, 2008

    YES I DONT WANT BOOO OVERLOAD THE FUSE DONT FLOW AFTER I CHANCE THE DIODES I NEED TO SEE HOW THE DIODES ARE CONECT IF I STAY IN USA I NDONT NEED YOUR HELP AND DONT TAKE MY MONEY SIR

  • colemansanti Dec 24, 2008

    thank you for you help .. for where I get the volts ac to make the bridge I get 8.2 volts positivo but the -negativo only about 5 volta like I dont have the service manual from where referenxe point ground .the stereo play only one the voltage is not righet for me ant help .coleman santi 561cc

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Go to www.JVC MX-GB6 skematic.com
good luck happy holiday.

Posted on Dec 22, 2008

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Hi and welcome to FixYa,

If the 4 diodes you referred to forms the bridge after the transformer, then the below screenshot of that particular part of the circuitry should help/guide you.
as soon I turn on the fuse  5amp  250 blow - 469be6a.jpg
Based on your post, what you further need is actual parts placement that would only be available with an actual identical unit at hand and boards removed. I doubt if even the service manual manual could provide parts placement.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 22, 2008

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It the problem of main board and needs to be checked to make it proper.as its getting overload /extra current or the resistors are faulty.

Posted on Dec 21, 2008

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Let me know exact model of unit. If you post picture of Circuit board where you replaced these diodes would be helpful.
I will provide you proper schematics to resolve the issue.

Posted on Dec 21, 2008

  • Shahid Electronics
    Shahid Electronics Dec 22, 2008

    here you can see pcb of bridge rectifier and schematic as well.





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1 Answer

What would cause my cb to blow fuses when u turn it on


d23 a 1n4004 diode second component from pa speaker port inside radio has failed. It is most likely that neg/pos polarity has been switched shorting this diode. It is there to protect your radio from reverse polarity as so it is names the "protection diode." 2 solutions first not recommended.

1. Cut the diode this will stop the directed grounding that is continuing to blow your fuse.
2. Go get a pack of 1n4004 and rosin core silver solder from radio shack and replace it paying attention to the direction it is installed.

just a side note the solder trace often burns in this area so a jumper wire soldered in around this bad area solder side maybe needed.

Jun 30, 2011 | Cobra 29 LTD CB Radio

2 Answers

When turn on it blows the fuse


There must be a diode that is faulty in the power supply section mainly on of the rectifying diodes.
If you look closely at your board you will see four diodes that just after the fuse and befroe the Big capaictor(filter cap.) One of these four diodes must be faulty as the fuse keeps blowing. the diodes are responsible of current limitation drawback. So there must be current flowing back to the fuse that makes it keep blowing.
Check and replace. Good luck
Thanks for using Fixya.

G.

Jun 27, 2011 | Pioneer SX-205 Receiver

1 Answer

To Mr. Hyde: you appear experienced with Bose 501 Series III speakers. I need to replace a burned out glass bulb fuse inside the right speaker, the fuse for the woofer I believe. I think that you said that...


Hello whit_hughes,

Just received your request for some information regarding Bose 501's......... Series III. Your looking for te manufacturers part # for the fuse which is in line with the woofer? The fuses used ON the Series III Crossovers (hard wired/soldered directly to crossover board/componants) have been Identified as BUSS #2494, 2amp, Quick-Blow Glass Tube Type Fuses. The fuse which is in-series with the woofer & the fuse which is in-series with the pair of tweeters are the same! In theory this means that the woofer is capable of twice the wattage of the tweeters due to the tweeters being wired in series with each other..... which in turn divides the power beween the two equaly. On the woofer circuit there is only the one speaker or voice coil obsorbing the power. The woofer circuit being wired in parallel with the tweeter circuit again splits the power between the two cuircuits..... so in an ideal situation the woofer sees 50% total input power while the tweeters each see 25% total input power;;;; totaling 100% total. The way Bose has fused them in the Series III's is such that each branch can obsorb a total of 2 amps before shutting down each indivigual branch. This can be adventageous..... should peak power be exceeded causing loss of full load abruptly, Amplifier Power Output Transistors usually blow..... however when only half of the full cuircuit shuts down due to peak power exeeding limits causing one fuse to open (blow) ... the actual impedance (resistance) of the speaker increases protecting the Amplifiers Output Transistors! Thats the reason for the 2 fuses. Each of them are identical. They are soldered into place.... via the wire which is attached to each end of the fuse. (Note; the fuse "kit" Bose is trying to sell you is an external in line fuse holder for each speaker {costing 1.29 each} & 2 fuses for each holder, One for now & One for Later aftr it blows {costing 1.00 each}..... costing Bose 6.58, neting Bose $13.42 Profit!!!! Keep in mind that this fuse WILL NOT FIX YOUR PROBLEM EITHER! DUE TO THE FUSE WHICH IS PRESENTLY BLOWN HAS NOT BEEN REPLACED!!!!! ) The one that has to be replaced is on the crossover... not between the Amplifier & the Speaker Enclosure. Tools required = 1 Long Big Straight Blade Screwdriver to pry off speaker grill, 1 Phyllips Screwdriver to remove screws seccuring woofer to encloser... be carefull not to damage/tear gasket, 1 pair side cutters to cut blown fuse out of crossover curcuit, 1 pair needle nose pliers to attach NEW fuse to crossover curcuit, 1 soldering Iron & a small piece of solder to re-solder fuses leads securly to crossover curcuit. ( replace gasket, woofer, screws, & speaker grill. ENJOY! Should additionaL informaton be required please let me know.... you'll have to leave me your e-mail address for pictures or drawings.... as I don't think they can be sent through this site. Hope this helps ya..... Its an EASY JOB...... you CAN DO IT! & will be glad you did when your done, they'll sound GREAT! ) GOOD LUCK!

Jun 22, 2011 | Audio Players & Recorders

1 Answer

I have an fisher RS636 when i cut it on it stay's on for 8-9 seconds and cuts off. 1 glass 125v/5amp fuse blowd which i changed. i am attempting to fix it myself does anyone have an idea were i start?...


Unplug the unit. Start in the power supply. Unplug any cabling going to the PS Board to minimize erroneous measurements. I am hoping you are technical since you are going to screw around with the electronics so let's get to it. Perform a diode check and capacitive check on main filters to make sure the bridge rectification is good. Next, analyze whatever V (TDA, STK, etc) output module may be on the power supply board (PS).

Should everything look good, keep the cabling off the PS Board but make sure the grounding leads are still tied to it. Replace the fuse with same E and I ratings. Plug in the power supply. Fuse blows? If so, you missed the problem on the PS... go back and run diagnostics (continuity on discretes). If it didn't blow, hook up the cabling the way it was and turn it back on. Fuse blow? More than likely it will be your output transistors. Perform tests while unit is unplugged (diode function).

Good luck and don't get bitten!

Apr 14, 2011 | Fisher RS909

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

When i plug it to the power cord it blows the fuse


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 D93. 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 D33 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!

Sep 14, 2010 | Galaxy Radios DX-66V Base CB Radio

2 Answers

I have a trc447cb radio, it kept blowing fuses, please help thanks...


This radio has been hooked up backwards. CB radios cannot be hooked up backwards or it will destroy it. However this is hope.

Because they can be damaged this way, there are polarity protection diodes in the radio that will blow if the radio is hooked up backwards, before it can hurt anything in the radio.

They are usually N1004 diodes. Is a big black diode that has a white stripe. And if it is blown, it will most likely be Black and burnt.

Open the radio, and look near the power section of the radio. It will be in the back near where the power cord plugs into it.

Look for a burnt black diode. That is the protection diode.

Get an N1004 or better from radio shack, and remove the burnt one, and put the new one in, making sure to put it in with the white strip on the same side as the original.

Once you have finished. Make sure the polarity is correct. Then hook up the radio, and turn it on. Should work fine.

If you want to validate that it is the correct diode, if you pull on leg out of the board, and turn on the radio, it will turn on. When the diode blows, it prevent the power from getting to the board, if you take it out, it will let it through. CAUTION. The radio will work again if you just remove the burn diode without replacing it. But if you hook it backwards again, it will be toast, and as good a door stop.

Sep 05, 2010 | Radio Shack TRC-447 CB Radio

1 Answer

Have cobra 29 nw ltd keeps blowing fuses inline and in cigarette lighter adapter adapter is 10 amps and inline is no more than 5 amps


This is an easy fix if you are comfortable soldering.

You must have hooked it up backwards. Big problem when using a cigarette lighter adapter. You have to be careful, if you hook a radio up backwards you blow the polarity protection diode.

  • Go to radio shack and buy an N1004 diode.
  • Open the radio
  • Look towards the back right of the radio for a black diode D23. it will probably look burnt, but not always.
  • Use a soldering wick to remove the solder holding the diode in.
  • Remove it, and replace the diode making sure its going in the same direction as the old on. Strip on the side the triangle is pointing.
  • Solder it in.
  • Test the radio
That should do it.

Make sure you are careful to hook the radio up to power corrctly.

Nov 14, 2009 | Cobra 29 LTD CB Radio

3 Answers

Keep blowing fuses


More than likely the power plug was turned around the wrong way when plugged in, and it burned ou the protection diode. This is a very common thing to happen and very easy to fix.

If you have and can use an ohm meter, any multimeter than can check resistance works, pu it on the Rx1 scale and put the black test lead to the black power lead and the red test lead to the red power lead. If you blew the diode, it will show up as a short, which is about 0 ohms, or continuity. Then reverse the red and black ohmmeter test leads, red to balck and black to red. It should still show a short.

Note: On a few CBs, the diode comes after the On/Off switch in the circuit, so you may not see the short until you turn the power switch "On".

If this is burned, reply here or you can send me an email at rollincbmods@yahoo.com and I will walk you through the changing of the diode. To change it, you need a rectifier diode you can pick up at Radio shack, I believe any one between 1N4001 through 1N4007 will work. I believe the radio shack down the road from me carries the 1N4005. If you don't have a radio shack, go to www.partsexpress.com and order one. I oder from them all the time, they are a very reliable company. They carry the 1N4007 for $0.09 each.

You also need to have a desoldering iron, or some thing to remove solder from a cuircuit board, a soldering iron, solder, and a pair or needle nose pliers or something to hold the diode.

Once you are ready, like I said, let me know and I will tell you which number it is in the radio, how to locate it, and what to do to replace it.

Dean Pitts
Rollin CBs
Mt. Vernon, TX

May 11, 2008 | Cobra 29 LTD CB Radio

1 Answer

Blown Fuse


It's drawing too much power. Maybe a short in an amp. Do you have any warranty left? Double check to make sure you have the right fuse. You might also try a slow blow fuse so  you can turn it off right away as soon as the fuse starts to glow to help in diagnosing. 

Apr 23, 2008 | Harman Kardon HK 3370 Receiver

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