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Yamaha M-65 Stereo Power Amplifier This amplifier has protection circuitry to protect the speakers on initial power up indicated by the red LED on the front panel. The problem is, this protection remains on under all conditions. Is this a common fault? Any advice or help would be much appreciated.

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  • martinolio Jul 25, 2008

    Tried unplugging power cable for five minutes. No joy.

  • martinolio Jul 25, 2008

    Speakers OK

    Blown component seems likely. Which one is the problem.

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  • Master
  • 19,396 Answers

Try first unplugging power cable for five minutes , see if it reset.

Posted on Jul 25, 2008

  • 2 more comments 
  • Ginko
    Ginko Jul 25, 2008

    If it does not reset, the protection power circuit detects excessive current of power MOS FET
    output and protects against shorts at
    each end of the speaker cables, and a circuit that protects against
    internal over-heating.
    Check your speakers, if problem persist can be short in speakers. Possibly test different speakers.
    It can also be a blown component inside or overheating (probably faulty fan).


  • Ginko
    Ginko Jul 25, 2008

    Take a chance with speakers , if the protection indicator is lit, then the speaker protection security had been activated.
    Often this can be reset turning unit ON and OFF or unplugging power.
    If it does not clear it means there is a real problem, either with the speakers or a fault in the unit itself.
    It must be tested with replacement speakers, can be a short on one fo the speakers.
    The protection circuitry can start also if there is a problem inside unit, in this case must be taken apart by a technician and tested.


  • Ginko
    Ginko Jul 25, 2008

    Well, if you go randomly you start testing from finals, check amp fuses on board etc. If you want to do it yourself buy the service manual.
    You will need the schematics in the manual.
    It has got also service procedures and troubleshooting diagrams for identifying the fault in a more rational way on the specific models.

  • Ginko
    Ginko Jul 25, 2008

    Here is more people with same trouble Yamaha M-65 in protection mode , but no solution given, apart taking the Amp for repairs.

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1 Answer

Standby indicator flashes


When the "Protection" indicator comes up the display panel of my receiver or the On/Standby LED is flashing, does that mean my receiver needs to be repaired?
The "Protection" light comes on when the receiver's current sensing and thermal monitors detect some unusual operating condition that, if left unchecked, might damage the amplifier. This can happen if there's a dead short in a speaker wire or if you're using very low impedance loudspeakers at high volume for an extended length of time. On older model AVRs you may see the word "Protect" on the receiver's display. More current models will indicate a flashing red light on the Standby LED when a Protection circuit trips
n thermal cases, the circuitry will automatically reset after a few minutes of cool down and the Protection indicator will go out and normal operation will resume. If the protection light came on due to a speaker wire short, low impedance condition or a bad speaker, the receiver's power will need to be turned off to reset it. Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.
If after checking all your connections, the Protection indicator stays lit, you may need to "initialize the microprocessor (see the FAQ on that topic) or take your receiver to an authorized repair center for a diagnostic. The "Initialization of the Microprocessor" or "reset" procedure can be found in your owner's manual on current model AVR product. Please note, this will erase all setup configurations in the system and require the system to be setup again. You may want to mark down the settings before resetting your receiver to aid in the setup process. If you had an installer setup your system, you can contact them for assistance and any associated costs that may apply to setup the receiver again would be the responsibility of the owner.

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Turn the volume down? Feed it cleaner source material?

http://s3.amazonaws.com/samsontech/related_docs/s1500_s2000_manual.pdf

You don't say under what conditions you're blowing them or if any of the informative indicators are warning you of impending doom. The Samson is capable of cooking just about any home speaker.


The following conditions will cause the Protection LED to go on:


Initial power-up: For approximately five seconds after initial power-up, the

protection circuitry is activated and the speaker output is muted. If everything is

operating normally, you will hear an audible click at the conclusion of this brief

period, as the protection circuitry is deactivated and the S1500 / S2000 begins

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Overheating: A temperature sensing device in the S1500 / S2000 will cause

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whenever the operating temperature of the unit rises above a safe level. To

guard against this problem, make sure the S1500 / S2000 receives adequate

ventilation on all sides and that both the front and rear panels are unobstructed.

Severe overcurrent conditions: This occurs whenever the signal being input to

the S1500 / S2000 rises to a level above 20% THD (Total Harmonic Distortion).

Shorted speaker cables: This will occur if, due to faulty wiring, the hot and

ground signals being output by the S1500 / S2000 short one another.

Output impedance drops below 2 ohms: This can occur if the S1500 / S2000

is connected to inappropriate speaker systems (see the "Setting Up and Using

Your S1500 / S2000" section on page 5 in this manual for more information).

DC voltage detected at speaker output: The most likely cause of this is an

internal failure.

In general, any time the Protection LED lights up (other than during the

approximately five seconds following initial power-up), there is reason to be

concerned. If this occurs, turn the S1500 / S2000 off immediately and carefully

check all wiring and external devices in order to locate and correct the condition

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For further assistance, contact your local Samson dealer. If purchased in the

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