Just an FYI
A lot of VOM meters, when reading ohms, have the polarity of the test leads
backwards.
Mike wb8vge
Sent from my iPhone
On Mar 13, 2013, at 8:24 PM, Stuart Rohre <rohre@arlut.utexas.edu> wrote:
> John, how old is your 962?
>
> You an easily check the bridge rectifiers with power off, and capacitor
> discharged through a resistor, individually.
>
> With a VOM, or DVM on ohms X 100, you should have low reading one way with
> the plus and minus probe and high when you swap probes around, for each diode
> of four in the bridge. You can easily trace the AC wires to the bridge,and
> the polarity of the other two terminals can be determined by following one
> wire to the plus side of the big electrolytic capacitors.
>
> The electrolytics should each measure near a short with the plus VOM lead to
> plus of the cap, then rise to several thousand ohms on a good cap. However,
> this is only with the low voltage of the meter, and does not say the cap is
> good at 12 volts. Do you have a scope to do more defined testing of the
> parts?
>
> If you lose only one diode in a bridge you get some funny results at the caps.
>
> Even before you get the diagram you can do these basic tests.
>
> Good Luck,
> 73,
> Stuart Rohre
> K5KVH
> _______________________________________________
>
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