Question about JVC KD-SX940 CD Player

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Kd-sx940 I removed the pre-amp IC from this radio but I fail to write the part number down. Does anyone know the P/N or has good IC to sell? Please help me ASAP!!!!!!!

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SOURCE: looking for a blown IC part number AN34001A

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I have a ken wood kr-797 stereo receiver but I can get sound but it's very low and I have to have the volume set at 0db in order to hear anything. It's like this on all inputs

I suspect that the pre-amp stage in you amp has failed. What you are hearing is the power amp on full volume. But with no pre-amp to boost the signal it's to low.
What we do know is that the sound is going into the pre-amp and out for you to hear it. This could mean that the power to the pre-amp stage is low, but still present.
Pre-amps these days mostly consist of a single IC. That could have failed, or it is not getting power. Since it would be possible to test the voltages to the IC, one pin should have something on it to the region of 6 to say 20 volts going into it. If the IC has that going to it, it has failed. If the voltages to all the pins are low, then you have a power problem.

Aug 27, 2015 | Audio Players & Recorders

1 Answer

I have a Crosley cr66 Rochester that plays records very quietly even at highest possible volume. Cds and radio can go to full volume so I know its not the speakers. Any idea what the problem could be?

There are 3 possibilities.
1 The Cartridge is faulty.
2 The wrong type of cartridge is fitted.
3 The pre-amp inside your unit has failed. This would not affect any of the other functions if the deck uses a Magnetic Cartridge.

The first is obvious for the solution.
The second is more tricky. For example if a Magnetic cartridge is fitted and the deck hasn't been built for one, the sound would be there but very low, as there is no internal pre-amp fitted. The solution there would be to replace the cartridge with a ceramic type or one that doesn't need a pre-amp.
To the third solution. If the internal pre-amp for the Magnetic cartridge has failed this would need a service engineer to do it, unless you have the knowledge yourself to do the job. It's likely that it will be an IC that does the entire job. It would have to be identified and replaced.
As I say the failure of the IC would not effect any other part of the system, because only the record deck goes into it.

Jul 19, 2015 | Crosley Audio Players & Recorders

1 Answer

My thorens td-190-2 recently lost its normal output volume. I have tried three cartridges with no change. What could it be?

I assume your turntable was connected to the record deck input on your amp when you lost volume from it. Then you tried other connections marked tape or CD?
As you have tried different cartridges with no response we can assume the piece of equipment that has failed is not your record deck. Instead it is your amp. The problem you are experiencing is that the pre-amp inside your amp has failed. This pre-amp is connected only to the record deck input of the amp. The other connections don't have this pre-amp which is called a magnetic cartridge pre-amp. So connecting to them will just give you the signal only from the deck, which as you say you can hear, thus proving the cartridge is working, but will be low in volume.

If you are any good at electronic repair it will be easy to fix this pre-amp. You can find it by following the internal connections from the record deck socket back to a circuit board. The chances are this will lead to an IC that does the work. Get the IC number and search the web for it, before removing it.
Alternative you can take it to a service centre for repair if you have no experience of electronic repair.
Another option is to search the web for a magnetic cartridge pre-amp. These are sold separately as many Audio amps don't have them fitted, seeing not many people have record decks. This can be connected between the deck and one of those other inputs (don't use the record deck one). The cost of one of these might work out cheaper than repair at a service centre. The repair by yourself will of course be cheaper, unless the IC is hard to find or specialised. But a search of the web for the IC number will show how cheap it is anyway. However if the IC is expensive that will also make repair by a service centre expensive too. So you can save the expense of the repair by going for a new pre-amp.

Sep 11, 2014 | Audio Players & Recorders

1 Answer

Technics SL-D33 Channel drop.

There's nothing wrong with the turntable then. It's your receiver that's the problem. In order to hear a magnetic cartridge it has to go via a pre-amp. It's this pre-amp that has failed in your receiver. It's only used by a turntable so wouldn't affect anything else. You should be able to trace this pre-amp by following the turntable socket wires. It will probably be a small IC that has failed. If you look up the number you should find it.

Nov 30, 2013 | Technics Audio Players & Recorders

1 Answer

Please eject always appears when cd loaded(up or down)

hi, your problem here could be one that is mechanical. try checking the reset switch on the cd mechanism (near the laser) may be dry/faulty, or the load/eject mechanism switches (found on top of mechanism) could be dry/faulty. also check for dry/weak solder joints on connectors between cd mechanism and main pc board. cheers!

Jun 01, 2012 | JVC KD-SX940 CD Player

1 Answer

Kd-sx940 manual/instructions for wiring?My original radio was stolen from my 1998 Ford Ranger and they cut the wires,I bought this one but it has the wiring harness to a Subaru,I don't care if I have...

installation manual:

And, for what's it's worth, the instruction manual:

May 22, 2011 | JVC KD-SX940 CD Player

1 Answer

ION turntable volume is low when plugged into a receiver.

Either the cartridge has failed, or an internal amp in the record deck has, or despite what you say the receiver has. I will clarify this for you. Magnetic cartridges need a pre-amp before it gets amplified by the pre-amp and power amp of your reciever. If that pre-amp fails you will still hear the low sound from the deck, but all others cd/tape would be normal as they don't go into the deck pre-amp.
All you need to is trace the circuit. Find the magnetic cartridge pre-amp and find where it joins with the pre-amp of the amp! If you stick a screwdriver at that point, you will get a buzz at normal volume on each channel. The cartridge pre-amp has gone if you do get a buzz!
You probably find it's a single IC that's gone, some are prone to static problems.

Jan 01, 2010 | ION Audio iTTUSB Turntable

1 Answer

I hooked up my JVC-KD-G210 and worked fine all of a sudden all 4 speakers quit the amp and sub still work i even ordered a new plug for back of stereo thought it was problem and still diddnt work id like...

Your internal amplifier for the radio has failed (output IC). Probably due to a shorted speaker or speaker wire.
Repairing the unit will cost as much as another one.
You may be able to pick up a small used 2 or 4 channel amplifier instead and use the RCA signal to feed it for less than the repair cost.
You will be surprised in the sound difference between a dedicated amplifier, and the one built in the radio anyway!
The typical radio SAYS 50Wx4... however - realistically can put out 12-15Wattsx4
a small 25x4 or 50x2 amplifier can be had easily for under $50 used, and will make a tremendous difference in sound quality... without having to spend more on the radio for it to potentially fail again anyway.
A Dedicated amplifier will have a built in protection circuit that will shut down instead of blow the output ICs like your radio did.

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Apr 14, 2009 | JVC KD-G210 CD Player

1 Answer

I don't know which JVC unit I have.

no i dont think so. but it is fairly easy to remove if u visit your nearest store that sell car stereos ask them for the removal too for a jvc radio. they should give u to flat L shaped pieces of metal all u have to do is remove the thin plastic trim piece around the radio then on both sides of the radio between the radio and the metal cage that holds the radio they will slide in u may have to play around with them a little till they unlock the radio but when they do all u have to do is just slide the radio to u enough to read a white label on the top of the radio that will give u the model number. should take no longer than 15 min. after that pull the tools out then just slide it back in till u here or feel it lock and your done oh dont forget to put the radio trim back on.

Nov 13, 2008 | JVC KD-S680 CD Player

1 Answer

I need a radio code .


there are two ways we can get a code for your vehicle. being a 2001 model, you most likely can just call the selling acura dealer and give them a VIN number. ( open the door driver's side and in there at the door jam) they will be able most likely to look it up for you. If you don't know who your selling dealer, try calling your local dealer and see if they can find it for you. sometimes they can pull the record even of it's not the selling dealer.

If all that fails, you will need to remove the radio and and get the serial number and model number so they can look it up that way. I would tell you how to remove the radio but this particular model is very complicated to remove for acura standards. Hope this helped good luck.

Oct 17, 2008 | 2001 Acura 3.2TL

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