I'm working on an R-4B and fried a resistor in the metering circuit. The 560-ohm resistor is now measuring about 80 ohms. I thought, perhaps, the resistor had simply failed, but decided to sniff around the circuit some more before subjecting this no-longer-obtainable meter to any more stress (it is still indicating when I put an ohmmeter across its terminals).
Whilst metering the meter (don't you love it?), I discovered that the right-hand terminal (when facing the back of it), was shorting to the metal case! Arrrggggghhh. I played around some more with the insulator and torque upon the nut and have it so it's no longer shorting to the case. When I lifted that oblong insulator to peek at the screw and where it comes through the back of the case, it appears that it is supposed to be isolated from the case - as I would expect. What could have caused this short? I'm very much suspecting that this could have fried that resistor. I've eliminated the short but am uneasy because I didn't see anything that fixed it other than re-torqueing the nut. Anyone ever have one of these puppies apart? 73, Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto.
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