Question about Xantech PA1235X Amplifier

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POWER SURGE AFTER A LIGHTNING STRIKE NEARBY, ONE CHANNEL LIGHT ON AMP STAYS ON, SPEAKER CONNECTED TO RIGHT SPEAKER OUTPUT ON THE LIT CHANNEL WAS FRIED. WHEN POWER TO THE AMP IS REMOVED A LOUD BANG IS HEARD.

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Sounds like DC on that output.
needs service possibly fried all the output transistors on that channel

Posted on Aug 01, 2008

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Amp light not working and one dead right channel


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.

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1 Answer

One channel thermal overload stays lit and no output from that channel. even after unit sits overnight, thermal light on immediately,unit not hot. Looking for schematic?


Red light is on if:
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Also could be a protection circuit malfunction.
In any case you need new channel module or send your module or whole amp for repair here.
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please check first your input source and confirm it is ok.-check speaker button is pressed(if you have one)-speaker cables are connected firmly-from amp side and speaker side-check mute button(also if you have one)is not pressed.-make reset for your system(power off and on).
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1 Answer

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1 Answer

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It seems you are implying that your receiver itself has got an amp though small. You use another amp to boost your power, is that right?

It will definitely damage both your receiver and amp, just waiting which one to go first if you do what you are saying. In the first place how do you connect your receiver to the second amp? it has a line out i suppose? and for now your speakers are only connected to the booster amp? So it is only a matter of selecting where your speakers get connected when you wanted. DO NOT, in any case splice your speaker wire to attach your receiver speaker to the output of your booster where your speakers are connected.

What you can do is just make a switch selecting which source you will use for your speakers. You just need a simple toggle switch 2poles/double throw. 1pole for each channel (R/L) connect your center pole to speaker, the other selectable 2poles to the output of booster, the other pole to the receiver. (each channel) that is your safest. If you a a techie you can actually make a power driven relay switch to select the speakers where to get connected but maybe you can not do that on your own. it has to be someone with knowhow, simple design though. the same principle, your meccanilca 2pole/double throw switch will be replaced by the same specs but relay. elecically driven whrn you turn on/off your booster.

redrivera0314@yahoo.com

Mar 23, 2008 | Amplifiers & Preamps

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