Question about Yamaha Music
Lets answer the question. Which button is not working? It normally means as suggested either the carbon under the rubber button is worn or in some cases the circuit board is damaged or worn. Try to replace the button first as the cheapest option. Report which button and I can send you details of the part number needed either by number on the attached or by which function it does eg tempo + / -
Posted on May 03, 2017
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Posted on Jan 02, 2017
When cleaning buttons HOPEFULLY you did NOT use DeOxit or other contact cleaners like Blue Shower as these can damage the buttons that are conductive rubber.
The conductive rubber buttons should ONLY be cleaned with 99% isoprophyl alcohol and Q Tips. Both the conductive "pill" and the traces they contact on the circuit board should be gently cleaned with the Q Tip wetted with the alcohol.
If you used anything but the 99% isoprophyl alcohol, you can TRY cleaning properly and hopefully they will not have permanent damage.
Posted on Jul 17, 2010
SOURCE: faulty connection for AC power
If the adapter is faulty I recommend replacing it with the exact one for your keyboard. Any Yamaha music dealer should have one. If it is the jack in the keyboard that the adapter plugs into that is faulty it can be fixed. It is soldered to the circuit board and the solder joint has likely failed. You will have to carefully disassemble the case and maybe take the circuit board out if the solder side isn't accessible. Once you can see the solder joint wiggle the jack to see where the break is. You will need to resolder it. If the jack is broken ( the center pin in the jack sometimes breaks) you will have to desolder it and take it to a good electronics store to obtain the correct replacement and then solder it in.
Posted on Aug 24, 2010
Testimonial: "Thank you so much for taking the time to comment- you were absolutely right! "
Check that your power adapter is 12 volts DC AND MOST IMPORTANT is the center pin is positive... this is reversed of MANY adapters used for pedals, etc. The current rating should be around 1.5 amps. Don't take another techs word for it... check it yourself.
Posted on Sep 02, 2011
SOURCE: Repairing Yamaha psr-12
If the power adapter is not the original adappter- check to make sure the polarity is correct- it should be marked on the keyboard near the adapter socket, and also on the adapter itself.
The keyboard should have an internal fuse- check that. Then with keyboard open, if the fuse is okay, trace the power flow from the power pack and look for broken wires, bad solder connections, stressed components like bulging capacitors, etc. It may have a burned out zener diode in the power supply regulator portion of the main circuit.
Posted on Mar 30, 2012
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