The RD schematics are here:
(Topic ID: 181695)
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Quoted from zimjoe:I'm not 100% if I know where to test for the first picture, so I added readings to my picture below. I'm new to a lot of this, so I hope those were close. I retested the second picture and got 0.030. That 8v pin doesn't have anything using either ground.
Hope these are what you were looking for
On the banded side (cathode) of Diode CR21 you should measure the 8.00 VDC, so your Zener Diode is faulty (open). It is an 8.2 V Zener Diode. Best source to buy is GPE, part number 1N4738A - this is a 1W Zener Diode, use this one and not the 1/2W type.
... you could try at first, to resolder the Z-Diode and the R21 pins a bit, mightbe, there is a cold solder joint ...
Quoted from CactusJack:Sounds more like a shorted zener, not open.
Correct!!!!
Why does RD use a 470 Ohm resistor? Shouldn´t it be 100 Ohm?
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