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How to fix the speaker jack of Yamaha Stagepas 300

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Stagepas 300.Why does one of the mic volume controls, have to be at full level to hear anything through the speakers the others are OK ?

I would suspect the input jack on that channel is either bad or has a leg come loose from the circuit board.

Jun 04, 2016 | Yamaha STAGEPAS 300 PA System

1 Answer

Stage pass300 cuts out during my gig

Normally that would indicate a problem with the power supply section of the amplifier.

Mar 16, 2015 | Yamaha STAGEPAS 300 PA System

1 Answer

Why does it cut out during a gig

Generally that indicates a power supply problem.

Mar 16, 2015 | Yamaha STAGEPAS 300 PA System

1 Answer

Yamaha Stagepas 300

short.. main out mosfets are damaged.

Sep 09, 2014 | Yamaha STAGEPAS 300 Portable PA System...

1 Answer

I have a yamaha stagepas 300 system. When I connected up the mixer to the power cord and switched on white smoke came from the air vent. What is this?

Well, if the system does turns on, it could be just an OPAMP its one of various little 8-pin ic's that are in the pre-amp section that got fried, STAGEPASS YAMAHA Powered mixers runs with a switchmode power supply, if the power amp section has any problem the power supply does not turn on, if you can add further details like if it does turn on, the green light turns on, do you hear something in the speakers, the more the info the best i can help you.


Nov 04, 2013 | Yamaha HD-200 / StagePas 300 Package

1 Answer

Yamaha CP 300 broken headphone jack

Some keyboards use the amp output sockets for headphone use.
You might need some adapters for your headphones.
If it fell in, you would see an empty hole. This would be unlikely because it is held on by two screws. If all fails, buy an amp with a headphone jack input. Plug the keyboard into the amp and use the amps jack.

Dec 15, 2011 | Yamaha CP300 Stage Digital Piano...

1 Answer

Last night I took it to a performance,. I plug in the 2 microphones etc, the indicator shows there is inout to the amp as usual, but there is no sound from both speakers. And not even small noise from the...

Here you go:

Scroll down to "Get manual" on the webpage and click to download. IGNORE other download links. This is a class D amplifier and the switching power supplies run directly off the power line so as a qualified technician I am sure you know to use an isolation transformer while working on this for personal safety. I am GOING to make an educated guess at the problem... The circuitry has a surge limiting precharge for the input power filter with a thermistor that when power is almost up and circuits are balanced the thermistor is shorted out by a relay so that the high currents can be handled... I suspect that the thermistor has gone bad... now that can be due to a short in the rectifier filter combination OR even a failure in the switching power supply or lastly, just a part failure of the thermistor. Using an isolation transformer, ALSO put a 100 watt incandescent lamp in serie with the power input cord to act as a resetable fuse and current limiter while working on this. Let me know how it goes...

Sep 12, 2011 | Yamaha STAGEPAS 300 PA System

1 Answer

How can I obtain a plugin 100w module for my Stagepas 300 as both output transistors are short circuit plus several pcb mounted driver transistors/resistors damaged.Thank you David Bunn

You could try buying the part from Yamaha America... the music section in California. Transistors and resistors are easily replaceable so repair of the board would be the path I would take myself... but then I am an electrical engineer.

Aug 24, 2011 | Yamaha HD-200 / StagePas 300 Package

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