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
Craig Cramb