Question about Pioneer VSX-52TX Receiver

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Pioneer VSX-52 Elite Receiver Dc offset problem..

I have +45V. on emitter resistor R146 of Front Right channel !
all resistors..Q2-Q4, Q114-Q116 checks ok. I think is dc coming from
Q104, since voltages read different compare to Q103 I need to know what are Q103 and Q104 ? they are 6 legged (3 each side) small rectangular transistor,the marking on them: '1240' are they FET or Diff.Amp ? I need to know the part number, and where to order ? Any help will be greatly appreciated.. Thank You.

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  • Pioneer Master
  • 27,252 Answers

Voltages will read differently because the output voltage is wrong.
They are not FET and with all due respect, if you are not aware of what they are, you don't stand much chance of reading the service manual and affecting a repair.
Take it to an authorised Pioneer Repair Agent.

Posted on Jun 17, 2017


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Hi there,
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Posted on Jan 02, 2017

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SOURCE: don't know how to use my Pioneer VSX-52 stereo receiver

you can get your pioneer user manual from here.
just type in your model number and away you go.


Blue ICE

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SOURCE: Pioneer SX 300 low volume

Which speakers do you have connected?
if your speakers are too "heavy" in terms of Ohm, this is the cause.

Posted on Jul 08, 2008

SOURCE: "dc out" error on Pioneer VSX-108 receiver

EAT A ****

Posted on Jul 08, 2008

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SOURCE: Problems with Sharp Blu Ray Player "copy protected signal"

Possible solution: You set up your remote to run your amp from the TV control, using the AQUOS Link. Even though your amp is out of the loop, it's still recognized by the TV. You might have to reset the TV back to default and run the AQUOS Link again.

Posted on May 20, 2009

  • 30 Answers

SOURCE: Pioneer VSX-D411 receiver "Amp Error" message

Unfortunatelly your receiver has failed. The front panel is telling you one of the power modules is probably bad. Not an DIY type of repair. These parts are near $40.00, plus cost of replacing.
Look at options to replace your trusted receiver with a new one.
Good luck

Posted on Aug 02, 2009

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I have bad static from my Pioneer vsx 49 Elite

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No amplification

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Feb 26, 2009 | Pioneer VSX-D557

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Balancing output current in push-pull amplifier

If you can not find a service manual, look for the emitter resistors connected to the outputs. They are usually small value like .22 ohms. There should be one from the emitter of the 2SA3281 and one on the 2SC3281 emitters. These two resistors will connect together at the end opposite the emitter. Sometimes these resistors will be combined into one 3 legged resistor. If you can find these resistors, then measure the DC voltage across one of the resistors in the channel that was not bad. This is your reference. Then compare this to the same resistor in the channel you repaired. Here is a simplified diagram. You are looking for RE
The other thing you need to check is the DC voltage from the center of these two emitter resistors to ground. It should be very close to zero.

You do not need to replace the other set of transistors.

All measurements should be taken with the volume turned all the way down.

Dec 24, 2017 | Audio Players & Recorders

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