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Anthony F.
Anthony F., Engineer
Category: Electronic Musical Instruments
Satisfied Customers: 9830
Experience:  Amplifier and keyboard repair.
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My father in laws Yamaha PF1500 started playing up a while

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My father in laws Yamaha PF1500 started playing up a while ago with the odd key not sounding but now all the keys produce a distorted, fuzzy note. Has anyone got an idea of the possible cause and whether or not it is repairable? thanks

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Customer: replied 2 years ago.
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This problem can be in 1 of 2 stages
the OUTPUT stage is just an audio amp
like a stereo
if its bad ...
the sound will be low and distorted
and may be reoairable
the 2cd part is the oscillator circuit that genreates the tones
this is much more compicated and may be a lost cuase
is the volume of the unit seem normal??
or is it weak and distorted?
Customer: replied 2 years ago.
The volume seems ok generally although some keys are noticeably quieter but all are distorted ie there is a fuzzy vibration to the notes
Assuming you have all the EFX turned off then you have a oscillation getting into the tone to beat against the freq causing the fuzzy sound
this is most likely caused by bad capacitors in the osc circuit leaking a unwanted freq ino the main mix
Now we need turn to yoru expereince Are you a technician?
becuase we are now involved in a compoenent level repair
you need good soldering skils and a EMF resistance meter to find the issue
I would reccomend finding a local tech if you are not very good with these tools
I am more than willing to troubleshoot it if you are a tech and understand Electronics
Anthony F., Engineer
Satisfied Customers: 9830
Experience: Amplifier and keyboard repair.
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