Hi DJ,
I suggest you use your ohmmeter (preferably a COM) to check the
junctions of the bipolar transistors in the regulator circuit. Check
devices from base to collector and base to emitter. Your readings should
be low forward and high in reverse. You'll need to use a meter that
provides a volt or so on its test leads in the ohmmeter position. Check
from emitter to collectors, too. That should reveal any shorts. If
likely good your readings should be high both ways. Do the same tests on
the diodes, even the Zener diodes.
Needless to say, be sure the supply is off and the filter caps are
discharged before making these tests.
Vy 73, /AI2Q/, Alex
On 6/4/2021 12:18 AM, DJ wrote:
Hi All
Could some one let me know if there is a proper schematic for my TenTec 960
power supply;y ,none I have are proper in terms of parts.
Problem is that I turn on supply , I can Adjust to proper voltage, but when I
put any load on the supply like 1 to 18 amps amp it, the voltage goes to zero
volts.
Take load of it is ok with proper voltage , have two supplies with same problem.
Sure could use some help on this.
Checked all the parts ,have replaced parts , 723 on all, my brain is gone .
Thank you for the read
DJ. K6RCL. Goleta, Calif.
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