Oluwatayo Oluwatobi John Services

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REPAIR AND HOW TO DIAGNOSE SOUND ON YAMAHA PSR S670.
List of components/parts associated with sound in it;
1. Analog motherboard (phono jack and Operational amplifier)
2. PNL (Volume potentiometer/variable resistor)
3. PNC (microcontroller/microprocessor)
4. Digital Motherboard
a. Tone generator
b. DSP RAM (Digital sound processor random access memory)
c. 12v voltage regulator
d. 5v voltage regulator
e. DAC (Digital – Analog converter)
f. Digital power amplifier
g. Operational amplifiers.
As a technician, as long as you can identify and test the above components, you cannot have issue diagnosing (knowing the faulty ones) sound related faults on YAMAHA PSR S670.
Like we used to say that before you start testing any components, there are three (3) major questions you must ask yourself and have answers to them;
1. What property/functionality do I want to test in this component?
This means, every components has at least one property. For example, a voltage regulator has voltage, current, temperature as their major properties (though most technician test only the voltage).
An oscillator on the other hand has only frequency as it’s property. While microcontroller has many properties.
So, what you need to choose is the most important property of that components that you want to test.
2. What instruments/equipment is suitable to test that property?
This is where you check your toolbox for the appropriate one to be used (multimeter, signal tracer, oscilloscope, signal generator, logic analyzer and others)
For example, multimeter is okay to test for voltage and current of a voltage regulator.
Oscilloscope is good to test for the frequency of an oscillator.
3. What value am I expected to get?
This is actually the most important of them all because, it is the one that will judge if that components is good or not.
For example, you can know is a voltage regulator (let’s say 12v) is good when the output voltage is approximately 12v. Any value far more or far less than 12v means the voltage regulator is bad.
The reason why approximate value is accepted is because, we have what we call tolerance for all components.
If you cannot answer the three (3) questions above, don’t bother to talk about testing/diagnosing keyboard.
For more enquiry; visit us at 3, Victoria close off oke Street Diamond Estate bus stop along Isheri Igando Road Lagos, Nigeria.
MUSICAL INSTRUMENTS REPAIR