They usually mount this on the trackside of the main board; therefore, one would have to gain access to the underside of the main board to take voltage measurements. Studying the documentation of the MFP IC and the pinout, the first logical voltage measurements I wanted to make was to determine if the IC was getting power. Unfortunately, the negative voltage was not present on the pin; hence, the investigation continued further to the circuit that produces it.
The trail led to a negative voltage regulator circuit consisting of Q, Q, and Q As you can see, the main link in this circuit is Q that carries the current, whilst the other two transistors behave as regulators. I managed to bend Q over slightly , and measure the voltages at its terminals and found that there was voltage at the emitter, but nothing at the collector end, even though there was sufficient voltage at the base junction.
This was the solid proof needed that transistor Q had failed and would need replacing. Looking on eBay, I found some sellers who had replacement 2SC transistors, but the prices seemed too much for my pocket, so I decided to look in my recycled transistors bag to see if I already had one.
After comparing the specs of many transistors, I found a 2SC that had identical absolute maximum ratings. Further detailed comparisons indicated that it would be a good substitute, so I decided to use that. It was a 2SC! Therefore, I checked the manual again to make sure, and sure enough, Q is stated to be a 2SC Therefore, my impression is that these transistors may be good substitutes for each other.
I therefore installed the recycled 2SC and it repaired the fault, and the amplifier had sound again! Perhaps a good modification would be to use a higher spec transistor with greater collector dissipation. I personally do not like the idea of mods and usually prefer to install exactly the same component that was originally there, keeping changes to a minimum.
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