Testing AC on Super Sprint

friedfish

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I want to verify that the voltages coming from the power supply are correct on a Super Sprint. The power supply has 12 and 18 VAC coming off of it. What points on the power supply did I need to touch with the multimeter to check the voltages?

I also would like to check the 14VDC coming off the audio board. How do I go about checking that?

Any help would be appreciated?
 
I want to verify that the voltages coming from the power supply are correct on a Super Sprint. The power supply has 12 and 18 VAC coming off of it. What points on the power supply did I need to touch with the multimeter to check the voltages?

I also would like to check the 14VDC coming off the audio board. How do I go about checking that?

Any help would be appreciated?

Looks like the main transformer has the ac voltage you want to check. The locations to check are F2=12 volt ac; F3=12 volt ac; F4=18vac. You check these with the red lead and the black lead to a ground or neutral (ground is better).

As for the audio; you can check that at the power input to the TDA2002 on pin 5 for the red lead and pin 3 for the ground or you can just check the voltage at the capacitor C137/ One side is positive and the other is ground.
 
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