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SX-950 Stereo Pioneer Receiver

SX-950 31year old Pioneer Receiver will sometimes click on with the surge protection switch and sometimes not. If the unit does click on it will play fine for a minute or so then click off again. The power relay part no. ASR-019-0 type 4U 24VDC is the problem I think. Of course no one has the part or will help with cross refrence for a replacement. I have thoroughly cleaned the inside and rewired the speakers.Do you have suggestions or even a solution.

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  • randy6363 Apr 02, 2008

    Excellent response and advice. I will definently use this service again.

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The relay is a protection device for the speakers. It will shut off the speakers when problems are detected internally. I would suspect that some of the capacitors in the front end are in need of replacing. This is a common item for units this old. I have restored a number of these for customers over the years with much success. Figure about $15-$20 in parts for this repair plus the local labor rate. This unit is definately worth a refurb. What happens is that there is dsome DC voltage being leaked into the final amplification stage. This triggers the protection circuit to shut off the speakers. DC voltage on a speaker will heat up the coil and eventually destroy the speaker.
Dan

Posted on Apr 02, 2008

  • ismailkostak Jan 13, 2015

    Good assessment.

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Fortunately this old school has this protection, otherwise you would lose not only the output transistors, also your valuable speakers.

Posted on Jan 13, 2015

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Pioneer sx-850 goes into protection after several minutes of use. It seems to be after warm up or when room temperature is too high. Summer temps.


Did you check whether the protection assy is working properly? The protection circuit is checking the current of the power transistors as far as I remeber. So there are several possibilities for that fault.
You should grab the service manual or at least schematic (http://elektrotanya.com/pioneer_sx-850_sch.pdf/download.html) and then go step-by-step. I recommend to start up with the protection assy itself. If this works properly go for the power amp. It is also not unlikely that the power supply is the cause of the problem.
Good luck.

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Am Ferrite Bar Antenna

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SX-1600 + KD-491F


Hi again,

It would seem that you posted the problem here also. With your kind permission, I will repost my excerpts of my responses that others may benefit on similar concerns.

A. Most current receivers no longer include a PHONO input. Perhaps what could be done is to purchase a phono to line level pre-amplifier to go along in your purchase for a new receiver.

I was made to understand that the Pioneer SX-1600 is prone to speaker output problems which could either be:
1. the speaker relay (protection); and/or
2. the amp, STK4191II Stereo Module.

Either should be relatively easy to work on and perhaps you can try the services of a locally available qualified electronic technician since the repairs would not be too specialized. The service manual may be of help (or at least a schematic , they may be downloaded from here and here).

B. To recap what you need is a receiver that can accommodate:
4 - Pioneer S-DF1-K (15-100W, 8 ohms)
1 - Pioneer PD-F407 25 Disc CD Player
1 - Pioneer CT-300 dual tape deck
1 - Kenwood KD-491F turntable

C. Possible choices are (keeping in mind that the power output should be less if not equal to 100 watts and a turntable/phono input):
i. Onkyo TX-8522 Stereo Receiver;
ii. Yamaha RX-397 100 Watt Natural Sound AM/FM Stereo Receiver;
iii. Sony STR DE695 AV receiver;
iv. Teac AG-790 200 Watt Stereo Receiver;
v. Denon AVR 888 - AV receiver - 7.1 channel.

Some of the above also includes feature(s) to hook up to your video system. Some may even require a fifth speaker (subwoofer).

Incidentally, you can also choose another brand/model even without a turntable/phono input. As initially posted, a turntable/phone to line level pre-amplifier is only required. Here are some examples:
a. XP200 Turntable Preamp - Nano Series;
b. Pyle® Pro PP999 Phono Preamplifier;
c. Pro-Ject Phono Box Turntable Preamplifier;
d. Radial J33 RIAA Turntable Preamp Direct Box

Good luck with your project.

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