Question about Yamaha Rx-v365 A/V Home Theater Receiver

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Yamaha dc protection remedy

Dc protection remedy

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Are you trying to run the Yamaha off an inverter? if so good inverters have built in protection?

Posted on Jan 04, 2013

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Posted on Jan 02, 2017

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Power Off after two seconds


There are, at the very least, a few different types of protection, DC Offset, Thermal Overload, or simply a voltage from a sensor transistor to the microprocessor IC,(display microprocessor) that communicates with the main microprocessor IC, one of the computers in your unit) to open the AC relay. If require more assistance, or would like to inquire about repairing your unit, please visit my website at audioserviceclinic.com. Thank you.

May 29, 2014 | Yamaha Audio Players & Recorders

1 Answer

Auto off within two seconds Yamaha RX V795


Are speakers connected when you try powering up?

If so , you have an output imbalance where there is too much DC voltage on one of the outputs and the Protect is working OK....In my opinion , not worth getting repaired ( UNless you're a tech and can do it yourself)

May 26, 2014 | Yamaha Audio Players & Recorders

1 Answer

My Yamaha RX-V661 powers on when I hit the power switch. After two seconds it goes to stand by.


try holding the 'straight' and 'audio select' buttons and press power. What does it say on the front panel? Should say some kind of protect: I, DC, PS. This will help narrow down where your problem is.

Oct 15, 2013 | Yamaha RX-V661 Receiver

1 Answer

My Yamaha YHT-791BL amplifier goes off every time I turn it on. How can I fix it?


hello,
Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Its usually not a fault that you will see unless somethings burnt up. This is solid state electronics and you dont see this stuff go bad. But in the meantime try disconnecting the speakers and see if it still goes into shutdown and at the same time have a dc multimeter attached to the speaker outputs. If the unit comes on and you dont see any DC at all or very very little B+ on both speaker terminal sets then you may have a defective speaker. If you do see dc then thats why the protections comming on so you dont blow out your speakers.
Also check for cracked solder connection.
Good Luck

May 26, 2010 | Yamaha AX-596 Amplifier

1 Answer

DC Offsets on output - protection don't allowd to switch on


you don't want to do this( bypass the protection0
that d.c. output will burn the coils in your speakers with out making a sound!! you have a biasing problem
or like you said a d.c. offset problem it is best to work on this problem with out a load on the amp, this will allow you to trace back where the trouble is starting at. caps will cause this sort of problem but leaky transistors can also do this, even diodes.
this will require an experienced trouble-shooter.

Apr 26, 2010 | Audio Players & Recorders

1 Answer

Htr 5630 shut off in 2 sec.


Sounds like you have a bad amp IC or transistors.
When these go bad they almost always put roughly 40 volts dc from the amp power supply to the speaker terminals. The protection circuit senses this dangerous (to your speakers) dc voltage and disconnects the speaker terminals from the amp via internal relays (the ones you hear click) and puts it into protect mode. If it didn't the dc voltage would quickly toast the voice coils of the connected speaker.

Apr 18, 2010 | Yamaha HTR-6130 Receiver

1 Answer

I have blown the protection circuit on my yamaha rx 600d amp anyone with a clue whats needed to fix?


Hi friend,when something goes wrong in the output of the amplifier the protection circuit take place to prevent further damage could cause by DC power such as speakers or other related circuits...I think in your situation either one or both output amp stage have blown,then the protection cct turned on (not blown protection circuit!?). If so you have to check all the output transistors for short cct, if shorted you must also check all the DC bias cct nearby such as small transistors,resistors...If you are not familar with amplifier it better to find a tech as all amplifiers need a very precide repair technic , If the DC BIAS were wrong , when you turn on the power it will blow straight away! All times and cost will be waisted!
GOOD LUCK!
Tan Ta

Nov 23, 2009 | Yamaha Audio Players & Recorders

1 Answer

Yamaha RX-770 Receiver display quit


there is a bulb inside the backlight on the lcd display.it is 12 volt and alot of manufacturers run it from the +- 15 volt preamp power supply,on the plus rail.when the bulb burns out it can activate the dc speaker protect,or some other 12 or 15 volt circuit..if it is a flourescent display that is a different problem.those run on 5 12 18 and -32 volts.there is also a 6 volt ac filament voltage.you need the schematic.

Jun 14, 2009 | Yamaha RX-770

1 Answer

I have a yamaha amplifier in here for repairs, the model no is A500, i cannot get the speaker protect relay to come on, i have replaced all the transistors & capacitors in the speaker protet circuit to no...


Measure DC to ground on the output transistors to check for any offset. The protect circuit is the least likely to be the problem. Post the readings here and I'll guide you from there.

Dan

Mar 11, 2009 | Yamaha XS-350 2-Channel Amplifier

2 Answers

Protection of yamaha pc 2002


Protect delay is in the relay and not adjustable as to delay time.
I would not worry unless no sound then may have to replace relay.

GOOD LUCK
BIG RED

Feb 20, 2008 | Yamaha P2500S Amplifier

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