Hi there,
since my last thread has gone wild ;-) ... here comes a new one.
I just checked the PCB again for any visual problems
but didn't find any. And then I did the measurements again.
I now have -0.1 to -0.15V on J3+ (yes, MINUS). Still zero V at TP1.
Any idea how this voltage could get there? I don't dare to neglect this
reading and proceed with the building...
Using a 4.7k resistance I shorted J3+ to ground and almost immediately the
voltage rises to 0V. Taking it away results in a slow drop to abt -0.1V. It
looks like discharging/charging a capacitor.
Kind regards
>>>> Old message follows...
=20
Good morning,
I'm still in the process of building my kpa100. After
my learning process concerning soldering :-) I
stumbled upon some voltages.
I'm on page 43 in the manual now and got some numbers
a bit off the given values (PS is 14V).
D13 154V
U4 -27.4V
TP1 0V
J3+ 0.1V
Are these numbers ok? Especially the last two?
Another thing. The fan at this stage is a bit out of
control. Calibrating tPA helps, but the K2 seems to
not remember this setting. Also strange is that while
setting tPA a relay can be heard switching. But maybe
this is normal at this point in the process?
Kind regards and keep on building...
Gerhard
DH3FAW
Gerhard Schwanz
DH3FAW
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