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Yamaha Amplifier AS 301, AS 501 intermittently shut off

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2 Answers

ADMIN Andrew

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  • Yamaha Master
  • 52,944 Answers

Nearly always due to overheating. Remove the case and vacuum all the lint out. Clean any vents at the rear.

Posted on Aug 02, 2022

Testimonial: "No over heating. Sometime the problem occur in few minutes on. tks"

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Larry Ng

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  • Yamaha Master
  • 11,183 Answers

2021 amp, has new TRICKS , add STANDBY.
4 causes,(more really) in the manual
1: speaker wire shorts or even speaker.
2: overheating of final PA power amp out. vents blocked. or lint.
3: a bad amp,(inside)
run the amp, on desk not a cabinet and cool 20F room,
no cables connected by AC power.
4: so does same thing at 8 hours unused it goes to STAND BY MODE. (2021 amp, now do this trick (wow)
does it still fail, this 1 test. do tell.

I have 40 year old amps here 100watt RMS out.
that self shut off for speaker short or too hot.
nothing at all new about that and do not need a processor to do that ever.(facts)!
what matters are the new 2021 tricks inside.

it does say turn the volume down to stop amp overheating. or let it cool in the manual
or power surged
or Impedance switch set wrong
the Power LED dims so show standby

Posted on Aug 02, 2022

Testimonial: "Everything looks normal no error at the indicator. No overheating, no open/short circuit and might occurred wihin few minutes. The amplifies has microcontroller to detect any abnormality . Googiling indicated the similar clicking relay problem occurred on similar model with random turn on. In my case is random turn off (turn to standby). Thanks"

  • Larry Ng
    Larry Ng Aug 04, 2022

    read the manual about that. it goes to stand by because it sees (detects) the amp being unused.
    not playing music etc.
    so it did not really shut off, (cut sound) it just went to sleep like a PC, (Energy Star like (laws etc)

    Yamaha Amplifier AS 301, AS 501 YOU HAVE 2 AMPS? OR 1.??
    I am reading your manual to you.
    page one tells,
    Even when the [A] (Standby/On) switch is turned off, a small amount of current still flows through this product.
    Save power by using AUTO POWER STANDBY switch (see page 4)
    Dim power lamp Dimly lit,
    This unit is in “standby” mode.
    For details on the “standby” mode, see page 6.https://manuals.plus/yamaha/a-s701a-s301...

    page9

    The unit enters standby mode automatically if not operated for 8 hours.

    If A AMP on the remote control is pressed while the A (power) switch on the front panel is in the on position, this unit enters standby mode. Press A AMP again to turn this unit on.
    trouble page, goes off suddenly word.
    Confirm that there are no other issues causing this problem, and then turn this unit on again.
    To turn off the AUTO POWER STANDBY function, set the AUTO POWER STANDBY switch to OFF on the rear panel.
    full stop, the manual goes on and on about standby,
    found all this in under 1minute reading the manual to you
    RTM.

    2021, the brave new world.

  • Anonymous Aug 05, 2022

    Thanks.

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