Hi Craig,
I too have one of Jerry's loads. It works very well. I bought
it when I got tired of using clip leads and a couple of power
resistors.
The 10V supply is a very important reference voltage,
start there. If it is wrong, nothing else will be right.
-Chuck Harris
On Sun, 4 Dec 2022 21:06:20 -0600 "Craig Cramb"
<electronixtoolbox@...> wrote:
2465B S/N B077993
Inverter card 670-7282-12?
Regulator 670-7281-08
Previous repairs unknown.
?
?Looking into a power supply that is basically non- functional on
some voltages. I have removed it from the scope and connected it to
power supplies loading assembly that was built by Jerry Massengale.
This is perfect for checking power supply and have used it over the
years. But now I¡¯m stuck and cannot seem to see what is causing low
voltage from supplies to be out of tolerance. +87= 60vdc +42=
19.92vdc -15VU=-17.80vdc +10=0.113vdc +5VD=+4.13vdc +5=3.3vdc
-5=-2.8vdc
-15=-1.47vdc
-8=-2.15vdc
+15=+2.58vdc
I looked into the inverter troubleshooting and built myself a +5VD
primary test load and then went back to inverter troubleshooting and
decided this isn¡¯t going to help me as it seems to stop at +10vdc. I
went thru and checked the unregulated voltages at J234b side.
1=-17vdc,2=-6.3vdc,3=gnd,4=+6.3vdc, 5=+17.3 (All a little low by
2vdc) J233b side. 1=-6.2vdc,2=+17.2,3=+48,4=Gnd,5=+90.8. (These
seem close a bit high but 1=6.2vdc is way high as per schematic)
This is where I¡¯m at right now. If anyone would like to make any
suggestions it would be greatly appreciated.
Craig Cramb
