20 Most Recent Pioneer SX-650 stereo receiver- ORIGINAL SCHEMATIC DIAGRAM Questions & Answers


Just guessing - for a considerable time amplifier output stages have often used encapsulated modules rather than discrete components. Like everything else these arrive in different qualities.

High quality amplifiers tend to use higher quality output modules - the best have built in overload protection and thermal shutdown and I expect that could be what is happening, something inside the amp is cooking and when it becomes too warm it shuts down.

I suggest you take it to the repair shop before the problem becomes really expensive.

Pioneer Audio... | Answered on Aug 25, 2020


Did you fix it? I have the exact same problem

Pioneer Audio... | Answered on Aug 13, 2020


http://audio.manualsonline.com/manuals/mfg/pioneer/vsx819hk.html

It's in the manual. Page 12.

Resetting the Main Unit
Use this procedure to reset all the receiver's settings to the factory default. Use the front panel controls to do this.
1 Switch the receiver into standby.
2 While holding down the BAND button, press and hold the STANDBY/ON button for about two seconds.
3 When you see RESET? appear in the display, press AUTO SURROUND/STREAM DIRECT.
OK? shows in the display.
4 Press STEREO/A.L.C to confirm.
OK appears in the display to indicate that the receiver has been reset to the factory settings.

Pioneer Audio... | Answered on Jun 22, 2020


There might be a fuse either in the rear panel or inside the case that might be worth checking. Manuals can be downloaded from the link below, though the best advice I can offer is entrust the diagnosis and fault to a professional.

https://www.hifiengine.com/manual_library/pioneer/sx-251r.shtml

Pioneer Audio... | Answered on Jun 19, 2020


I sounds like you may have a problem in either one of the Regulator circuits, or, one of the Power Amplifier outputs. If the protect circuit detects DC or Low Impedance on one or more of the speaker lines, it will not fire up the high power section of the power supply. Further troubleshooting will require some working knowledge of power amp and power supply circuits. I've got a .pdf copy of the Service Manual if that will help you.
Please let me know what your level of troubleshooting ability is, and whether the manual will help you.
-Petra

Pioneer Audio... | Answered on May 17, 2020


It would go into protection mode to stop damaging other components...... until the fault is rectified it will not stop going into protection mode!

Usually this is caused by a short in the wiring, get this tested!

Pioneer Audio... | Answered on May 12, 2020


The shaft on the motor is not lined up with the turntable or gear. Adjust the motor (if possible) so it’s properly aligned. Also, clean motor shaft with rubbing alcohol.

Pioneer Audio... | Answered on Apr 21, 2020

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