![background image](http://html1.mh-extra.com/html/paia/vocal-zapper-6730/vocal-zapper-6730_assembly-and-using-manual_747070016.webp)
pins by counting up in a ccw direction around the part from the
notch or pin 1 indicator. This should m7 to 8V DC. If the
tester is digital readout, it will autopolarize and you can go on and
measure the negative DC on pin 4 for a -7 to 8V DC reading. If it
is analog with a meter movement, put the red on ground/common
and measure with the black so the needle doesn't try to swing the
wrong direction.
The output pins of the op-amp IC (pin1, pin 7) should measure
appoximately 0V DC.