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Bad output IC VSX-D457 Need a schematic of the audio amp section. Found out the PAC is replaced by STK4231II etc.Just want to make sure don't destroy a new replacement by checking everything in driver circuits

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6 Suggested Answers

SOURCE: Reads PROTECT on the display of my Onkyo TX-SV525 ???

HOWDY,         NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S.

SUCCES !                              AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER

Posted on Oct 23, 2007

  • 30 Answers

SOURCE: Pioneer VSX-D412 AMP-ERR message.

Hello,
The AMP-ERR message in many Pioneer Receivers is caused by some DC in the output. The microprocessor then issues the warning and shuts the unit off. It is definitely not a relay switch. It could be the amplifier power pack, i.e. PAC011A or similar that is faulty or something else. Not easy to repair for the non- experienced DIY.

Good luck

Posted on Apr 24, 2009

  • 27 Answers

SOURCE: Noisy left hand power output stage. Noisy transistor? No circuit diagram.

If the speaker is not blown, there must be an output capacitor. If no output capacitor, and you have a blown transistor the speaker will blow from DC current. You can further check the transistors with a multimeter. A transistor looks like 2 diodes and you should be abobe to test with a mulimenter like a diode test.

Posted on May 12, 2009

  • 233 Answers

SOURCE: Pioneer VSX-D511 Comes up with AMP ERROR and shuts down

I must agree that if the fuses are open and you replace them that your problem maybe fixed. If you can remove the fuse, I recommend taking it to a RadioShack and see if someone there can figure out what it is. I am going to assume that the fuse should be a 250 V. If you can find one that matches the same appearance, go with the smallest aperage rating you can find. Go with this route only if the person can not tell you exactly what it is you need. Be sure to match the type of fuse if you can see inside it like in the case of a glass fuse. Some are slow-blow fuses and some are fast-blow. If you are uncertain your safest bet is to use a fast-blow with a real low amp rating for the voltage you are using. If the amp rating is too low, it may run fine at lower volumes and pop when you turn it up. If I could physically see the fuse, I would probably be able to tell you what it was and what you needed to replace it with.

Posted on Jun 06, 2009

  • 336 Answers

SOURCE: VSX-D457 Display's power off and then shutdown

Most likely it needs one of the output ICs. But check for cold solder rings on the ground connections of the input board. Est. for it to be repaired $100-$120

Posted on Dec 17, 2009

  • 506 Answers

SOURCE: output stage scheme for pioneer vsx-d1 channel floating negative.

It should be a push pull. The fact that you have negative voltage almost certainly means push pull. One side will be constructed using NPN transistors ran off the positive DC rail and the other side will be constructed using PNP transistors ran off the negative rail. I don't know the age of your amp but I know pioneer now uses integrated amp modules instead of discrete transistors.

http://pdf1.alldatasheet.com/datasheet-pdf/view/82968/SANYO/STK412-020.html

example of integrated amp module (sorry for the chinese)

Posted on Feb 11, 2010

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1 Answer

Can't get the subwoofer to work


try setting the front speakers to 'small' in the setup menu. some models of pioneer receivers disable the subwoofer output if the fronts are set to large

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I have a Pioneer VSX-305 receiver. I blew channel A speaker outputs by allowing speaker wires to touch. Everything else works. Can anyone tell me what it takes to fix this. (I am an electrical engineer...


Without a Sams Photofact or a service manual I would go directly to the Power IC which is the largest Integrated Circuit mounted to a large heat sink. If you see any fuses they are probably for the power supply since any fused circuit on the speaker output would be ineffective because the IC would be damaged before the fuse would blow, but you need to check them anyway. Since the short was at the speaker output your problem should be at the final stage of amplification, which is the Power Amp IC. Prior to the early 70's you would have transistors mounted to a heat sink which could be individually checked and replaced. Then manufactures started to use the Power Amp IC which are more costly but eliminate having to find matched pair transistors. All you can check on the Power Amp IC is if you have an input using an oscilloscope or signal tracer and the power to the IC. If you have an input signal and power to the device with no output, I would replace the IC. Unless you have a test circuit for the IC you cannot test it completely unless you have a device like a Huntron Tracker or build a test circuit using a signal generator and a power supply to measure the gain of the IC with an oscilloscope. Short of ordering a service manual this is a good place to start.

Aug 15, 2011 | Audio & Video Receivers

1 Answer

My Pioneer SX-780 Receiver has very low volume and distorted. Are the output IC Amps bad? They use (2) STK-0050


A little more triage would be in order before you take a knife to it. What source(s) produce the distorted sound? How about test tones? Same? It's sick. Not same? Something else is going on. Have you referred to the manual(s)?

Apr 07, 2011 | Pioneer VSX-D457 Receiver

1 Answer

What does it means when it says overload on an sa-he200?


This is the same as protect mode and means that a problem has been detected in the final output stage of the amplifier. This typically means that either the speaker wires are crossed or (more likely) the actual amp section has a problem. This unit has at least one "amp-pac" or IC that is the output amplifier section. This part may need to be replaced. If so, the part alone will run about $90. A local service tech should be able to determine whether or not the amp-pac is the problem by takeing a few measurements.

Hope this helps,
Dan

Feb 10, 2010 | Panasonic SA-HE200 Receiver

1 Answer

No audio output


THE FIX - to audio problems that persist with the VSX-29TX and others using the AWX7272 DSP board is to replace the ROM on the DSP. My unit started failing on and off after 10 years of use! The intermittent DSP board is an Extremely Common and irritating Problem for this model! The replacement IC,(2) resistors + shipping and handling totaled $49.65 and my unit is finally fixed correctly! Don't believe other posts that you can get away with re-soldering; it will continue to fail again and again! Details of fix are:

Replacement for the old Pioneer ROM located at location IC 9374, should be done with the part PD6381A from Pioneer Electronics. You will also need to move (relocate) the 2 resistors (0 Ohm resistors) located at R9372 and R9371 to locations R9374 and R9373.

This component update applies to DSP boards marked as AWX7433, AWX7272.

This fix is validated (from Pioneer) on the VSX-26TX,VSX-27TX,& VSX-29TX it might also work in the VSX-908, VSX-908RDS and others as long as the same DSP board was used.

Let me caution and stress that surface mount soldering skills ARE REQUIRED to do this update! It also doesn't hurt to have excellent vision and/or an eye loop or microscope to check your work. Original ROM's were subject to timing changes internal to the part as a result of HEAT. This model does get HOT! The program was also modified as a further safeguard to re-occurrence.

Jan 30, 2010 | Pioneer VSX-29TX Receiver

1 Answer

VSX-D457 Display's power off and then shutdown


Most likely it needs one of the output ICs. But check for cold solder rings on the ground connections of the input board. Est. for it to be repaired $100-$120

Dec 17, 2009 | Pioneer VSX-D457 Receiver

1 Answer

Remote


The remote sensor assembly on the front panel of the amp will need to be replaced. It is the small tin shielded box with 3 wires connecting to it(behind the remote sensor window). Check that the sensor has still has 5 volts to it before removing. Some models have a 5 v reg IC on the front panel to run the sensor

Jan 12, 2008 | Pioneer VSX-D457 Receiver

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