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Pioneer sx-650 no left channel - Audio Players & Recorders

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: pioneer SX1280 repair

I have taken my 1280 to Austin Stereo, they are honest , upfront, and guarantee their work. So impressed that I took a 1080 that two previous techs had butchered and they fixed it to like new specs.512-451-0408 is their #. They go out of their way to help those of us that are not well versed in techspeak. Both units sound superb with the big 15 inch Cerwin Vega speakers!!!

Posted on May 07, 2008

SOURCE: Pioneer SX-450 Receive: Left Channel

Hello. Receiver is been repared. I was told that a transistor and some resistors falled aut.
Thank you for assistance.

Posted on Nov 04, 2008

  • 1 Answer

SOURCE: Pioneer SX-9000 Receiver Nothing out of the left channel no sound

Both final amps have old glass cylinder type fuses (automotive type) 3ag 3 amp surge fuses. I would look there first. The fuses are on the back labeled 3AG Left and 3AG Right power amp. They look like knobs twist them counter clock wise and pull them out. DO THIS WITH the power turned off.

If the fuses are good (remove them one at a time and check them with a multimeter on the lowest ohms range) connect your speakers and crank up the channel slowly ( use the balance control) that is not working and listen for noise on the speaker. (You can do this with ear phones plugged in the front also but you may require a mini to large phone jack adapter).
Adjust the balance. If there is noise but no sound then there is a possibility that one of the final amplifier transistors are not working or one of the preamp stage transistors have gone bad. If the unit keeps blowing fuses the big power transistors on that speaker channel have shorted internally and need replacement.
Next I would work the switches having to do with the A+B functions on the front panel. If you do not have the speakers connected select the internal load function on the front panel so that the amplifiers are connected to at least 8 ohms 60 watts each with the volume below half. Also check your speaker to make it is good by turning off the unit and switch the speakers on the back of the unit. Then turn it on and repeat this test. Does the problem stay on the same channel or change with the speaker?

If you take off the cover always disconnect the power cord from the wall. Never do anything inside the unit with the power connected to 115VAC. I've learned that the hard way too many times.

If you find a bad fuse, remember that some of the transistors in the unit are matched A-B pairs so if there are two transistors per channel you need to replace both. e.g.: If one goes bad it usually weakens the other and a new transistor on an A-B pair can cause the other to crash when it is installed causing the new one to crash also and blowing out the fuse again. This should be done by a repair shop.

If the SX has not run for a long time one of the coupling capacitors on the output amp may be bad. Check also for anything around the large transistors near the back of the SX-9000 (inside) that looks like it might have black charred marks on it or around it. If something appears to have burnt out you will need a repair shop.

I have had some problems with dirty switches on my SX-9000. Also dirt and dust is always a problem. It may need some cleaning and the switches cycled through the functions several times.

Unless you know what you are doing I would not recommend using contact cleaner or volume control cleaner on it. However, if you do, use only about a milliseconds worth of spray. The idea is to get the spray inside the controls or switches one at a time and then to operate the switch or control fully at least five times. Never do this or anything inside the SX with the SX-9000 plugged in.

This is a really old post but I will be back to check on it daily for a few weeks. I will try to help if I can.


Posted on Aug 05, 2009

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Check the final output relays first. They are mechanical and have been known to fail after so many cycles. The click you hear about 3 seconds after you push the power button are those relays.

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You haven't mentioned what you have done to isolate the problem so I have to ask some stupid questions.

Is the Left Channel failing no matter what source you select?
N: Source problem / Identify the source and ask another question with new data
Y: continue...

Turn the receiver OFF.

Toggle the Tape Monitor Switch up a number of times to wear off any oxidation. Any change?
While you're at it, toggle, twist and operate every control throughout its range for the same purpose. Lower the volume.

Turn the receiver ON.
Tune an FM station.

Swap the Left Speaker leads and the Right Speaker leads at the receiver. Did it move with the speaker?
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use a cable tester for the wires that are connecting to the unit and you'll find the faulty wire that is bad.....good luck

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Pioneer SX-450 Receive: Left Channel is not working. The reason is a short circuit (cable)on an Exi tof the Channel. Thank your.

Hello. Receiver is been repared. I was told that a transistor and some resistors falled aut.
Thank you for assistance.

Nov 03, 2008 | Pioneer Audio Players & Recorders

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a little bit foolish thing: see if you have both the speaker channels (A and B) down. if you have both down it doesn't work - didn't for me.. and obviously make sure you have the right letter down - same outpout as your boxes

Dec 06, 2007 | Pioneer SX-205 Receiver

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