Question about Yamaha DSPE390 Amplifier

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Yamaha dsp-/e300 wont switch on

Amp wont switch on was intermitant and only took short time to power up ..but as time has passed unit no longer will fire up no disply or switchon thump.from speakers..have checked power supply it appears all voltages are there ..however dont have a circuit diagram to check against

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  • Ray Lockwood Jan 21, 2008

    thanks jfpogie not a speaker related same with or without speakers .knucles

  • Anonymous Feb 12, 2009

    I do have the same problem,
    after some time it suddenly works but not consistent when switched off again. I cant find loose wires.

  • Anonymous Mar 26, 2014

    DSP-A2 fully disconnected from power. The only connection was optical input from a Sat
    Receiver. After a lightening the Amplifer switching on, after 4 seconds getting off.
    Any body can help ?. A fully check up shows
    Any of the components are not faulty.
    If a current flow throug optical cable may be
    Stored in protection circuit, how can I reset it. Please help me.



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No display at all in your front panel?

you said power supply is ok... all voltages...
i remember DSPE300, small power amp only IC. can you check your +/- main power supply if ok it should be around +/- 35V. If it's there then place your meter neg to speaker ground, the + to red and try to run on the unit. see if you'lll get a pulse in AC meter mode. Or a DC voltage in DC mode.
then check also your secondary supply that's about +/- 15volts. Your standby voltage for the CPU to work is 5V. please check that as well

If the trouble is main amp, you should still have a display screen. Unless it is a total breakdown and main out totally shorted, it really wont turn on but you said you seem to find voltage.


Posted on Mar 19, 2008

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Check your speaker wire and speaker for short circuit.

Posted on Jan 21, 2008


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Register and download the manual for free at

See Page 73 Troubleshooting.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

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