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U1 voltages off
Posted:
Fri Jun 09, 2006 5:33 amby JustMike
I just built my first A12 and I'm cautiously testing. I hooked up the PSU and fired it up. No Smoke- good sign. I started testing voltages at U1 and I'm only getting +4 and -4v at pins 3 & 5 respectively. Is this within tolerance with pots R25 & R29 rotated fully counterclockwise?
Voltages at J1 are 45, 25 & -25v.
A12 chassis is not grounded to PSU chassis. Could this be it?
DOH! C4 was reversed! Time to bump up my reading glasses.
Posted:
Fri Jun 09, 2006 9:32 amby JustMike
OK, switched C4, but still same voltages. Again, is +4 &-4v on pins 3&5 of U1 within tolerance with the pots all the way down?
Posted:
Fri Jun 09, 2006 9:40 amby tpryan
That would be a big no. Are all the LEDs lit on the PS03? Are the regulators getting hot?
Posted:
Fri Jun 09, 2006 9:50 amby JustMike
NEVER MIND.....my meter doesn't work on that scale. Changed scale and I'm getting 14.02 & -14.02v.
Sorry for wasting your time. But thanks for responding.
Posted:
Fri Jun 09, 2006 10:51 amby dkatz42
JustMike \$m[1]:NEVER MIND.....my meter doesn't work on that scale. Changed scale and I'm getting 14.02 & -14.02v.
Sorry for wasting your time. But thanks for responding.
Autoranging DMMs are well worth the relatively minimal additional expense...