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
  • 25,268 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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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Eagleeyes
  • 199 Answers

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

http://www.service.pioneer-eur.com/peeservice/RegistrInstrMan.nsf/search?openform

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


Mark

Blue ICE

Posted on Feb 26, 2008

easyq
  • 144 Answers

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

  • 120 Answers

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

Hello,
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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1 Answer

How many fuses are on my pioneer reciver vsx-d606s?


1 for the power supply and 1 for left and 1 for right channel, but every stage inside has also fuse-resistors resistors with a extra function to protect some components that are resistors the are mounted higher or different on the print .

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What does it mean when my Advanced MCACC light blinks on and off? Also, the power button isn't working.


It is in protect mode. Try holding the advanced surround and power buttons. If it turns on but turns right back off, you most likely have a bad amp channel that needs to be repaired.

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VSX 60. MCACC blue Light flashes and unit will not turn on


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Mar 25, 2014 | Pioneer VSX-52TX Receiver

1 Answer

Pioneer vsx 405 overloading whenever it turns on I checked the speaker wires and they are all OK.


vsx405 came error dc protection chacked all power transistors c2500 ,a1948 all ok i was disconnect dc detector wire then ok after few minutes one pair burned with c945100 ohms resistors that time not fix heat sink then all replaced power on error overload with speaker and without speakers also coming error disconnect ol wire no chang pease help any expert amplifiers thanks

Oct 27, 2011 | Pioneer VSX-405 Receiver

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My pionner audio video multi changer receiver vsx-498 shuts off then turns on when the receiver is on how can i fix it


The problem is not clear. Does the unnamed multichanger turn of/on wit hthe VSX-498 or is the VSX-489 having power issues?

Is the power cord of the multichanger plugged into the back of the VSX maybe the outlet is SWITCHED with the power state of the VSX..

Jul 15, 2011 | Audio Players & Recorders

1 Answer

I have bad static from my Pioneer vsx 49 Elite


sorry no easy solution as it sounds like the output transistors blew out or the emmitter resistors. you will need a service manual and an multimeter to measure the resistors on or around the audio output transistors they are a low value resistor usually around 1 to 2 watts in size. Do not replace any bad , burnt or discolloered resistors around the audio output transistors as if tou do you might just cause more damage to the output transistorsor audio output stage including the audio driver stage of the amp!!!!!!
Larry Dillon

Aug 27, 2009 | Audio Players & Recorders

1 Answer

No amplification


The transistors are marked with the part # on them A1302 for example would be 2SA1302. most transistors all you do is add "2S" to the front. If the fuse opened then you may only need the two transistors, if it did not then you will need to replace the dual emmitter resistor and a few resistors 4.7ohm and 100ohm are common in pioneers.

Feb 26, 2009 | Pioneer VSX-D557

1 Answer

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

https://i.stack.imgur.com/hRHeo.gif
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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