I do have the schematics for this amp. The problem started after a power surge attack. I have 4 Yamaha M-series power amps, the other 3 survived, this particular one - the protection circuit stays engaged. I know a little about electronics, but don't really know where to start with this guy. Is it a bad relay, or something in the amp circuitry that keeps the protection circuit engaged?? TIA for the help! *** So, I researched this issue, and figure I need to test the Output Transistors. I ordered a transistor tester to do this with. I figure I need to remove the transistors to check them...?? Am I barking up the right tree?
Hi there. More than likely the power output stage has a problem (possible if the amp was on at the time of the surge). It would be best to have a proper component tester to check the stage components but component testers are expensive. But the good thing is that you have an other working amp. Since you don't have the knowledge or proper equipment I would suggest to open up both amps and compare the readings of the same points of each amp. A shorted or cut-off power semiconductor would show even on a multi-tester set at the diode scale. Check also ALL the fuses and fuse resistors related to the output stage (resistors under 1? (brown black black 1? or gold brown black 0.1?) .
SOURCE: Amp Power light will not go on. Protection light is lit- Thump sound in speakers
It probably has shorted output transistors. To eliminate other possible causes, read through the following page.
Amplifier in Protect Mode - Troubleshooting
Let me know if you have any other questions.
SOURCE: Hooking up speakers to amp
YES ! This is usually ok, the speaker cabinet should contain a high pass filter or crossover on the tweeter to decouple it from the low frequency signals. My Linn Index speakers are wired like this.
SOURCE: Power on problem
Time for a little repair here. It seems that one or more channels have developed an excessive drain on the supply, and has caused the threshold to trip and shut you down. It's more than likely shop time at this point....accordianman
SOURCE: Onkyo A-RV401 amp is not sending any sound to the speakers.
The protection circuit is self resetting, it operates only when there is a fault condition in the amp. there is most probably a failure in the output stages of the amp causing a dc offset condition in the speaker output. The protection cct operates to prevent damage to your speakers. It may be difficult to offer a solution to you for this, it gets a bit complex to fix from here...you may have dry solder joint problems in the output stages, or more likely, failed output components. if you have a transistor checker(ohms meter), then you may be able to determine if any output transistors have failed, I recommend taking the amp to a good HiFi guy for repair. Many (including myself) often replace the all transistors to the last 2 stages when outputs fail. assures reliability in the future to repair this way, but the cost goes up a bit also. expect at least $120 to repair is it is a failed output stage.
SOURCE: yamaha dsp-/e300 wont switch on
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.
reden
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