Pioneer SX-750 Old School Need Help

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Pioneer SX-R9 Service Manual

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View and Download Pioneer SX-R9 service manual online. Stereo Tuner amplifier. SX-R9 amplifier pdf manual download.

Or find a local audio technician.

Check an see if you have a and b channel switch for speakers may be on wrong channel

Looking for SX2300 manual.

do you have in connected to a phono input? be sure you haven't connected it to another input..........turntables are low-level (20ma) output, cannoit drive high-level input (200ma).........good success, meder's tv service

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)?

Check the area where the fuse was...it's usually marked on the board or next to the fuse holder. Check the size also, 2 types 5x20mm or 1/4x1 1/4 in. Usually slow blow.

DVD audio straight in from its highest quality audio output. Use the stereo audio output to run straight to the TV for casual watching through TV speakers without the Pioneer involved.

A TV is just a glorified night-light, not a sound source - get its related audio from the Cable Box, ditto the highest quality

Yes, but it depends on your laptop hardware and software. We'd need to know a lot more about that side.

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.

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