Question about Yamaha DSPE390 Amplifier
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 ..ie 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
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
Check your speaker wire and speaker for short circuit.
Posted on Jan 21, 2008
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Posted on Jan 02, 2017
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May 20, 2012 | Yamaha DSP-A1 Receiver
Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
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