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Yamaha psr 70

I pluged the wrong adaptor into the keyboard and now it wont turn on what do i do to fix it?

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Talk w yr supplier
explain exactly what you have done

Posted on Oct 20, 2013


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Why doesn't the Yamaha psr-78 get any power using an adapter?

Check that the powr adapter is working and putting out the correct voltage.

Mar 22, 2015 | Yamaha Music

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I have a yamaha psr s900 keyboard, the adapter is on and the green light is on but the keyboard is not turning on.

Have you measured the voltage and confirmed the polarity is correct? If yes to both of these then the problem is in the keyboard.

Can you get it to flicker / on off if you insert the adaptor plug and wiggle from side to side ( wiggle the plug - not you wiggle side to side ! )

If this makes an intermittent connection then you need to replace / refit the power socket. These have a habit of breaking the solder joint to the pcb.

Report back if this is not clear or you need further advice.

Feb 17, 2015 | Yamaha Music

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Yamaha psr 70

YAMAHA PSR-70 Keyboard - Lights On - No Sound
This may be the cause if the unit has not been powered up for a while; switched LEDs come on but fails to produce any sound from either or both channels:
Normally one would suspect faulty headphone switch jack or faulty LA4500 power output chips.

Most electrolytic capacitors can be slightly leaky (tens or hundreds ofkilo-ohms) after years of non-use.. They are re-polarized / reformed when equipment is switched on after aperiod of non-use and this effect would probably not be noticed since it make only takeseconds for all electrolytic capacitors to come up to specification...
In the circuit used for the Yamaha PSR-70(see the Sanyo Applications Notes for the LA4500)there is an 'anti-thump' / slow start capacitor (220uf 16V, aluminium electrolytic 'ripple filter' capacitor) connected between pin 9 and ground (of both LA4500 audio output chips in the PSR-70).Since these hold the chip in a power down condition, they cannot 'reform'from a near rail voltage normally present when the chip is turned on, due to lack of power and thus continually hold the amplifiers in a quiescent power down mode..
To remedy, they need to be disconnected and reformed with a 9Volt battery.After the Chips have powered up, there should then be about 90% of the rail voltage on their PIN 9...

They are not necessarily faulty, they just needs for the equipment to be powered up working for a minute (every year or so).Alternatively a4700 ohm(2m/A) resistor temporarily wired from the (9V) + rail(PIN 1) to PIN 9 of the LA 4500 may do the trick..
This reported fault may be very unusual or fairly common (these keyboards now being almost 30 years old...)

Hope this helps someone out - feedback will be appreciated

September 2014

Apr 23, 2014 | Computers & Internet

1 Answer

My Yamaha psr-500 wont turn on. When I push the on button the speakers make a popping sound and when I hold the on button down I get static through the speakers along with 3 notes one after the other

Is this on mains or battery? This keyboard must be nearly 20 years old, it's done well! If you have batteries in but are using mains power, the power adaptor could have failed and not enough juice left in batteries to work. Try new batteries and try without any.

Aug 09, 2013 | Yamaha Music

1 Answer

Hi My yamaha PSR S500 keyboard is not turning on! I bought a new adaptor but it still wont come on

Check that your adapter is a 12VDC with a current rating of at least 1 amp (1000ma) AND that the center pin of the connector is the POSITIVE.

Feb 07, 2011 | Yamaha PSR-S500 Digital Keyboard

1 Answer

The keyboard is showing sign of power input but the screen is not lighting and produces no sound

1. Try the volume

2. Your adapter may not be the proper voltage/amperage. If the adapter has ratings listed, make sure they match the keyboards ratings.

3. Try it with the headphones. If they work and the speakers don't, you've narrowed down your problem. There may be some damage or wiring problem within where the board meets the speakers, and/or before processing.

4. Try it with batteries. If that works, you need a new adapter.

Feb 06, 2011 | Yamaha PSR-S500 Digital Keyboard

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The keys are broken and some at no sound can I order the notes and sound kit. Yamaha PSR-295 . Regards Elias

Hi, i think you can. You can go to any of the Yamaha companies around you area and explain to them the problem of the keyboard. They will give you good and quality replacement part for your Keyboard.

Make sure you go to only Yamaha company to avoid getting a wrong part for your Keyboard.Avoid road siderepairsforissue like this,it's more complicated to handle

I guess that will do.

Thanks for using fixya...

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Do you have yamaha keyboard psr 2000 spare parts?

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