KLH RECIEVER r 3000 RIGHT CHANNEL DOSN'T PLAY. WHICH TRANSISTORS SHOULD I CHECK. COULD IT BE THE 4231 AMPLIFIER AND HOW CAN I CHECK IT

The speakers connections have to come from an amplifier with sound coming from it in the first place. Once connected to the unit the bass signal is then extracted from the signal and the rest of the signal sent to the main speakers. The KLH will not power the main speakers on it's own. The unit will only take the two main stereo channels, from an amplifier, the left and right then go to one set of inputs and they then come out of the other two outputs.

You have leaking transistor somewhere.

Without knowing how it's actually laid out, I'd surmise the output amplifier transistors in the right channel are shorted, the fuse for that channel may be blown, and the speaker protection circuit is keeping it turned off. Most amplifier speaker protectors disable both channels if there is a problem, but yours could be different. I surmise the lights you mention are directly connected to the speaker protector chips and indicate readiness for normal operation. If it takes a few seconds for them to come on after power-up, that lends credence to my hypothesis.
Unplug the amplifier, open it up, and measure the resistance from the right channel output to each of the output power supplies (or to the fuse for the output power supply for that channel, if present). If one or both is very low (i. e, close to zero), you have a fried transistor. If that is the case, it is probably a good idea to replace the complementary transistor connecting the speaker to the other power supply even if it tests good; it may have been overloaded when the first one shorted. In many amplifiers, the transistors are inside a hybrid amplifier module, so you would have to replace the entire module. In some amps, you have multiple transistors in parallel; here you can probably keep the transistors that were in parallel with the failed unit, but I'd still recommend changing the complementary transistors.

Check the bias resistors. They can burn out when power amp transistors fail. They will be very near to those two replacements. You can compare any parts using the right channel as a good. Readings and voltage measurements should be the same for both channels. Also the look of the parts. If a resistor is off-colour in the left, but not in the right you know something is up.

hi zm_16dec,

Right chanel fully dead , output transistor burnedout ,

Without knowing the make and model of your amplifier

all i can advise is to replace the unknown part number of

the transistor.


Look for the working left channel output transistors and

replace the bad transistors in "pair". These may include

other components but check on it as well.


Check the speaker system, especially where that channel

is connected.Inspect speaker wires or cable up to the speaker

itself.


Amplifier wont blow without reason.It could be from the wirings,

speaker or volume settings of the unit.

Thanks for choosing Fixya for assistance!

hi...
transistors are not ok on the C160 module.
replace all the power transistors and emitter resistors for that channel.
www.bdent.com and www.ceitron.com are good for transistors

Hi,
the amplifier appliances has an audio fault that is the one side of the output (the audio transistor mosfet ) could be bad , also check for a 100v 2600uf electrolytic capacitor if bad, replace for a new one.
Also check for dry joint on the pcb of the appliance.
This will require a skilled personnel to work on this...

the subwoofer i have, a polk, connects directly to the right and left speaker lines of the klh2400.
i then connect my stereo left and stereo right speakers to the subwoofer.
essentially, the subwoofer becomes a middle station between my speakers.
make sense?

HI ...NO, YOU CANT JUST CHANGE THE TRANSISTORS..YOU ARE RIGHT THERE IS MORE TO IT THAN THAT.......

first pull out the power transistor then biased the output terminal. base,emitter have dc volts .4 to .5 collector to emitter have full voltage. if this voltage are in ur pre amp buy new trasistor