Bullwinkle
Member
WMS System 6 power supply board - getting 12vdc where 5vdc should be
I'm working on rebuilding a system 6 power supply board. I've completed replacing pretty close to everything on the board. I power it up and on J6, pin 6 gives me 13.75vdc (which I expect, that's the 12vdc unregulated pin). Pins 7,8,9,10 all give me 12.52vdc. this is bad as those pins should be +5vdc. I have replaced the two large diodes in the 5v section. I'm assuming at this point I need to look at the voltage regulator on the big heat sink, I'm just sort of curious as to why I'd get 12.5volts. If it were failing, I'd think it'd be lower.
Does this sound right or is there possibly another explanation to this?
thanks
-tom
I'm working on rebuilding a system 6 power supply board. I've completed replacing pretty close to everything on the board. I power it up and on J6, pin 6 gives me 13.75vdc (which I expect, that's the 12vdc unregulated pin). Pins 7,8,9,10 all give me 12.52vdc. this is bad as those pins should be +5vdc. I have replaced the two large diodes in the 5v section. I'm assuming at this point I need to look at the voltage regulator on the big heat sink, I'm just sort of curious as to why I'd get 12.5volts. If it were failing, I'd think it'd be lower.
Does this sound right or is there possibly another explanation to this?
thanks
-tom