Question about JVC MX-J30 CD Shelf System

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No power not even light but power is going to transformer also touch the metal cover with a phase tester and it lights up (only just though)..jvc mx-j30

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shaun taylor

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Hello you may have ac power but no dc power take the cover off and have a look for any swollen capacitors or components that might be burn't


Posted on Feb 14, 2010


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I don't have no radio after getting my main fuse by the motor replaced looked at fuse box all in japanese googgled elgrand but gave diagram but fuses seem ok if i checked them properly thanks

You can check every fuse on the car in 5 minutes, without even pulling the fuse out to inspect it. You just need a cheap test light, one with an electrical lead with a clip and a needle type probe.

On the tops of all fuses (maxi-fuses, regular fuses, & mini-fuses) are two indents with metal showing, one at each end of the top.
For the under hood fuses, clip the tester lead to the negative post of the battery. Touch the positive battery post with the probe to check your ground clip is good-tester should light up. Now turn the key to on, not start, and touch the tester probe to one end of a fuse in the little slot-it should light up-(almost) every fuse on the car will have power going through it with the key in on. Now you probe the other end of fuse: If fuse is good, tester will light on both ends of fuse. A blown fuse will only light the tester on one end of fuse. If both ends light, fuse is good, and move to next fuse.

For the fuses inside the car, just clip the tester lead to a good ground point-a metal screw or metal bracket under the dash. Again with key in on, touch a fuse end in that testing slot. If tester doesn't light,. check or reposition the ground lead till you see the tester light up. Now touch each fuse on both ends. A good fuse will light the tester on both ends of fuse, a blown fuse will only light tester on one end of the fuse. There, you are done. You not only have checked all fuses, you have verified that power is going through the fuse panel.

There may be one or two fuses that won't light the tester on either end with key on. Some cars have an interior lights fuse that only gets power with the head or park light switch turned on. And some cars have a "crank" fuse that only gets power when the key is in crank or start. (A fuse for the radio will certainly have power with key in on.) There are a few fuses that are hot at all times (like brake lights fuse, and most if not all of the maxi-fuses). But with key on, (almost) every fuse should show power and light up a test light. good luck.

Dec 15, 2015 | Cars & Trucks

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Can the two transformers be hooked in parallel to service a 500 W zone?

If you are talking about low voltage light transformers, then answer is probably NO... but you could try it and see if it works... but I am almost certain that both transformers will probably burn out.
Output is 12 Volt AC... the transformer coils will probably burn out because the waveform from each transformer cannot be guaranteed to be the same.... even if both transformers are seemingly identical and plugged into same outlet.

For additional information, read transformer installation tips on following page.

Power company transformers can be wired together in specific ways to produce 3-phase waveform, but these transformers are specifically engineered for the task. And the transformers do not combine the output (as you would be doing with yard transformer), instead each power company transformer produces 1 leg of power in a 3-leg power supply.


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Mar 14, 2015 | Hardware & Accessories

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No power to left rear turn/ brake light

Check the display. Ask a helper to step on the brake pedal while you check the lights from the rear. If no lights appear, check the fuse that connects the brake lights. The owners manual will show the location of the fuse box and which fuse is for the brake lights. Pull out the fuse and look at the wire in the central window. If the wire is broken, replace the fuse. Make sure the new fuse is not blown, and carries the same amperage.
Take note of lights that are out, if any are working. The problem may be cured by replacing the bulb in a brake light that's out. A burned out bulb has a broken filament and a dark brown spot on one side. Check the owners manual for bulb type.
Check the circuit if replacement bulbs and fuses do not restore the lights. Find the wiring diagram in the vehicle assembly manual. The circuit for the brake lights runs from the battery to the fuse, to the pedal switch, to a connection plug, to the lights. The circuit has to be checked with a volt tester at all points.
Check the battery power and the light on your volt tester. Turn the ignition key far enough to activate the electrical systems. Turn on the lights to check for battery power. If the battery has power, ues it to check the volt tester. Put the black lead (the ground) from the volt tester on the negative battery terminal. Briefly touch the red tester light on the positive terminal. The light on the volt tester should flash brightly.
Test the wiring to the fuse. Clip the ground wire to solid metal near the fuse. Touch the light tip to both sides of the fuse. Both should light the tester. If neither side lights, the wire between the battery and fuse is bad. If only one side lights, the fuse is blown.
Test the switch and wiring. Touch the light tip of the tester to both terminals on the brake pedal switch without putting any pressure on the pedal. One should carry power and the other should not. When both show power, the switch is stuck and the brake lights are always on. If neither shows power, the wiring between the fuse and the switch is bad. Now check both switch terminals while the pedal is depressed. Both sides should light the tester. If not, the switch is bad.
Check the connection plug. Unplug the connection and refer to the vehicle manual to identify the brake light wire. Touch the tester light on the brake light wire at the inner socket on the battery side. If the tester lights, the power is flowing to this point. If not, the wire between the plug and the pedal switch is bad.
Check the socket. Plug in the connector plug and remove the bulb. Touch the contact inside the socket. If the tester lights, the socket is good. The socket and wire running to the plug should be replaced if the tester doesn't light.
Check the bulb with the ground wire. The bulb must be in its socket. The ground wire running to the socket should be black or brown. Stab the tester through the insulation. If the tester lights, the bulb is good. Replace the bulb if it doesn't light.
Check the ground wire. Remove some of the insulation around the ground wire. Twist one end of the extra wire around the exposed ground wire. Touch the other end to a solid piece of metal. If the brake light comes on, the ground wire is bad.
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Oct 13, 2014 | 2000 Ford Expedition

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Radio and lighter fuze has blown everything is in japanese and I dont know which fuze to me if you can.

You can check every fuse on the car in 5 or 10 minutes with a simple test light, without having to pull a single fuse out to check it.

On the top of every fuse are two slots, one at each end. These are testing ports for the fuse. The slot is open to the metal strip inside the fuse. Ground a test light by the fuse panel, and turn the key to ON. Now, every fuse on the car should have power to it. Touch the tester probe into a slot on the fuse-it should light up. Now move the probe to the other slot on that fuse. If the fuse is good it will light up the tester on both ends of the fuse. The metal strip inside the fuse is not blown, and the fuse is passing power through it. A bad or blown fuse will only light the tester on one end of the fuse. With key on, every fuse has power to it, so even a bad fuse will light the tester on one end of the fuse, but if fuse is blown, see, the other end of the fuse will not have power. Now you can see which fuse to replace.

Sep 13, 2014 | Cars & Trucks

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Where is the fuse for the cigarette lighter on a 1964 ford fairlane?

There's only one fuse block on the old cars, in the instrument panel on the driver's side. If the fuses are not labeled, use a test light to check every fuse. Only takes 5 minutes.
These are the old style fuses, with a round cylindrical clear glass in the middle? They push into metal clips on each end of the fuse?

Then ground a test light to a good ground under the dash- a bolt, screw, or metal. Now turn the key to ON. Every fuse should now be powered. Touch one end of the fuse or the metal clips with the test light-it should light up. If it doesn't, recheck the ground clip of tester-have to have a good ground. A good fuse will light the tester on both ends of the fuse. A bad or blown fuse will only light the tester on one end of the fuse. Power comes in on one side of the fuse terminal, and if the fuse is good, power will also be on both ends or terminals of the fuse.
A few fuses are hot at all times- the horn, tail lights, and brake lights for example. With key on, all fuses are hot-should have power on them. Modern fuses can be tested this way as well-all modern fuses have a test port on each end of the top of the fuse-this port is open to the metal strip inside the fuse. If power is on both ends of the fuse at the test ports, that fuse is good-you don't have to take it out to inspect-use a test light and check for blown fuses this way.

To test a cig. lighter: Ground the test light lead. Pull out the lighter. Use the needle probe of tester and carefully touch the center element inside the lighter base-the heating element-don't let the probe touch the sides of the case when touching the heating element-you may blow the fuse. If the lighter is good, with key on, the element should have power-will light up the tester. If the base part is good, has power, then maybe the pull out piece that lights cigarettes is bad. Or the lighter case is not grounded good. Some are case grounded to the metal dash, but some may have a ground wire on the back side of the base, behind the dash-check for that. The power wire to the lighter attaches at the center of the lighter base. If there is a ground wire, it will be attached on the side of the base, again this is behind the dash.

May 22, 2014 | 1967 Ford Fairlane

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The dome light, glovebox light, and cigarette lighter on my 1979 el camino have no power, and I believe they run off the same fuse. The lettering on the fuse box is gone, I don't have a manual and I can't...

Why not check every fuse in the fuse panel in 5 minutes or less, without pulling a single fuse out to inspect it? You can do it with a cheap test light, and even tell if the fuse panel is powered, too.

All fuses have two little test ports on the plastic top of the fuse, one at each end of the fuse. They can be used to tell if a fuse is good or blown. The little ports are open to the metal strip inside the fuse, the strip that snaps apart when the fuse blows.

Hook up a test light by clipping the ground lead to a metal bracket or a bolt or screw by the fuse panel. Turn the key to on, not start. Now every fuse in the fuse panel should be powered. Pick a fuse and touch the test light probe into the little test port on the fuse, either side. Test light should light. If not, either the ground clip for tester is not secure, or the fuse panel is not getting power to that fuse as it should with the key on, or you just happened to pick a blown fuse. Move tester probe to other end of fuse and see if power there. Keep on until your tester lights up when touching the little port on the fuse.
Got it? Okay, now with every fuse, you need to touch tester to both ends of fuse to verify a good fuse. Key is on, all fuses are powered up, so even a blown fuse will light the tester on one end of fuse. A good fuse will light the tester on both ends of the fuse-the metal strip inside has not snapped apart-good fuse.

You can use this method to check every fuse on a car without pulling the fuse out to check. And you will find out if any part of the panel is not powered up. Test lights are very handy. You could check every fuse quicker than it took me to explain this!

Oct 29, 2013 | Cars & Trucks

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No power to windows, radio, dash

I would start by checking if the under dash fuse panel is getting power to all the fuses. A few will be hot at all times (like the brake light fuse, horn fuse), but with key on, all fuses in the fuse panel should have power available to them.
Use a test light, clip the ground clip to a metal bracket, and use the test light probe to touch the fuses at the ends-the little indents on top of fuse is open to the metal strip in the fuse. When the probe touches that strip, the test light should light, meaning power is getting to the fuses. No light? Maybe not grounded good-keep trying until you get a light when touching the fuses through that little **** at top of fuse. When you have a good ground, check all fuses. With key on, all fuses should have power-now you can check the radio fuse and dash fuse.

You can do this also to check for a blown fuse. Even a blown fuse will light the tester on one end of fuse. A good fuse will light tester on both ends of fuse. A blown fuse will only light tester on one end. You can check fuses this way without pulling the fuse out to inspect.
If no power to the fuse panel or to part of the panel, look for a bad fusible link or maxi fuse that distributes power to the fuse panel. There may also be a relay (ignition relay) that the key switch turns on to send power to the fuses that are hot in accessory or run.

Sep 30, 2013 | 2001 Toyota Celica

1 Answer

Malibu transformer on but lights dont work

Voltage drop because transformer is not putting out enough power as when it was new.
Or Short along the wire somewhere.
Connect new wire and 1 bulb, but do not connect to existing wire.

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Apr 14, 2013 | Hardware & Accessories

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Now power from my living room. The outlet on the same circuit also now power. I used the Sperry Instrument tester and the outlet show lights on correctly. But when I plug a load on like a lamp or turn on...

I wonder if you don't have a place where the wire has abraded through and is now able to track to earth, or even a Partial Disconnection of the Phase wire, at that point and where it has worn through, it is contacting ground. You could have a Phase disconnection, that is touching earth, and when a load comes on, the fault, because of the current draw, now goes "Full On" as it "Shorts" to earth, while at same time, cannot deliver much current past that fault point. You need to remove Power from that Circuit, then measure, for Continuity, from Breaker Board to each wire in the Socket, and From Phase & Neutral to Earth. You should get continuity between Phase & Neutral, BUT nothing between each of those and Earth. If you twist together, the Phase and Neutral at the Socket, from the breaker board end, you should get a very LOW OHMS reading under 1 -2 OHMS, if not that is a fault.

Mar 03, 2010 | Measuring Tools & Sensors

1 Answer

What would be the problem?tv doesnt light but the phase tester does every point you touch.

check ur power supply ..I think the neutral point in the plug is faulty...

Dec 01, 2008 | Televison & Video

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