how to troubleshoot?

[Dave Krooshof]

>>I wouldn't worry about a buzzer. It only helps you determine that there is
>>a fairly good electrical connection between two points.
The buzzing function has a function, mostly, or rather, it's built in to a
function.
It's for testing diodes (or two pins ofa transistor, as PN can be measured
as a diode. So in each PNP and NPN you'll find two 'diodes' with your
multimeter. the fact that they share a N or P is what makes them able too
influence eachother.)
It differs from ohm meeting in several ways:
- the voltage you measure with is higher
- the voltage changes in the process of measuring
- on the display is the voltage in mvolts that was required for the diode
to become conductive, it's not ohms!
- beeplength in time often is another indication of this voltage.
Zero volts is infinite beep.

Mine beeps with a nicely unstable oscil.
beeeaoooeeep.

So now you know that you can measure transistors to test them.
Even if you do not know the pinout, you should be able to figure out
weather a suspect behaves like two diodes ducktaped together with one leg.

>DONT waste money on the Delton Horn book on fixing synths.. it is useless..
Good to know.
< :-) > what did it say? Synths die? </ :-) >


Dave




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Dave Krooshof http://www.xs4all.nl/~krooshof
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