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Receiver randomly shuts off during play

Pioneer VSX 3800 receiver shuts off by itself during operation. Sometimes cannot get it to power back up without unplugging it and plugging it back in. What could cause this problem? Thanks

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  • JoeyB JoeyB Apr 17, 2009

    Pioneer vsx 3800 - power up OK. Radio sound comes on after approx 10 min warm-up. No warm-up time needed for sound for CD or AUX.

    Three plugs in back of unit - two used by CD & Turntable. Jiggling these cords helps the sound come on sooner and also cut off. Taping on the side of the unit also lets the sound come on. Once unit is on for more than 15 - 20 mins, works fine.

    Off and on feedback in all modes - cd, radio, etc Have to jiggle the power cords for CD & turntable plugged into the back in addition to playing with the speaker wires.

    I was considering taking off the cover and just seeing if anything loose or needs cleaning. Any other suggestions. Love the unit. Thanks..

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This is the "Protect" mode. It is either a bad speaker, or not good ventilation, or a channel going out in the receiver. Please provide more details about the problem so I can help you better. How long is it playing before it shuts off, does it shut off even if the volume is low? Disconnect the speakers form the receiver and then turn it on and let it play without speakers, if it still shuts off then the problem is not the speakers. More information is needed to better diagnose this problem.

Posted on Feb 06, 2009

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Thyat is called the protection mode, There is a internal problem with it when they do that,

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Dear Tabasco,

Your receiver is basically going into protect mode.

Just check your speaker cabling again. Make sure that all of them are seated properly, none is touching each other or the body of receiver. Take out all the wire and put them back again if necessary..
Some times even a little tiny frayed wire touching the receiver could trigger the protect mode. Be careful, since protect mode is sometimes not fast enough and it could blown a few trasistors in the power circuit.
Just check your speaker as well....whether they play all right thru another receiver or amplifier. its posiible they might be shorting inside. A little frayed wire could also trigger the protect circuit in your receiver.
I hope this should solve your problem.

If everything else seems all right and still your receiver shut down when you raise the volume then it possible that there are bad connections on the main board that are set in.

This would generally happen if the system is slighly old or have dry solder and when you raise up the volume. This should be a simple repair that will not require parts. If you can solder, you will be able to repair this yourself. If not, then a local service center will change the local labor rate.
Hope you can sort out your problem with the above trouble shooting. Let me know if I can guide you further.
Best of luck! Thanks for using FixYa!

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I have a pioneer vsx3700s receiver,can you tell me where i can find a schematic or repair manual for it?


www.stereomanuals.com
G12 price code = $21.00 + $2.00 shipping

Pioneer VSX-3700S AV Receiver Service Manual = G12
COMMENT: (1990) Also VSX-3600, VSX-3900S, VSX-3800, VSX-411S, VSX-401. (IMPORTANT NOTE) Circuit Diagrams and PCB Pattern Layouts (and Exploded View, Parts List) only, balance (if any) of manual on (1) (not included) microfiche card. There are some separate manuals which are almost entirely for the Remote Controls: for VSX-411S and VSX-401, see VSX-411S. for VSX-3900S and VSX-3800, see VSX-3900S.
STOCK# = PIOVSX3700S-SM
DESCRIPTION: 56 total pages (18 intentionally blank), constructed as the original including (almost entirely) 11in x 17in folded /trimmed pullout pages, card stock covers, neatly assembled with 5 staples and fiber reinforced taped spine. Models covered: VSX-3700S, VSX-3600, VSX-3900S, VSX-3800, VSX-411S, VSX-401. Overall quality is Very Good.

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there may be broken soldering points in the receiver take it to a workshop or open it your self and check it on the power source

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