modessitt
Volunteer: Encyclopedia Submission Moderator
Well, I'm having a power issue that I need to confirm is actually a power issue. Right now, the +5 tab on the Video PCB is reading +6.8vdc - way too high. I've already rebuilt my ARIII with all new caps, new TIP32, new 2N3055's (NTE130's actually), and new +5 Adj pot. I even swapped out the LM305 with another 305 taken from a working ARII. I did find an open resistor at R28, but changing it didn't affect anything.
I also noticed my +10.3 is running at +11.86. I checked the supposed +10.6 coming from the power brick, and it is reading +14.58. I replaced the bridge recitifier in the brick, swapped out the Big Blue, and for some reason there is another big blue wired in off to the side of the power brick, and I swapped that out, too. No change.
Since I'm pretty sure the board is not operating properly anyway, could it's lack of proper function be not providing enough of a load to pull the +5 down where it should be?
I really need to make sure my power is right before I try tackling board issues....
I also noticed my +10.3 is running at +11.86. I checked the supposed +10.6 coming from the power brick, and it is reading +14.58. I replaced the bridge recitifier in the brick, swapped out the Big Blue, and for some reason there is another big blue wired in off to the side of the power brick, and I swapped that out, too. No change.
Since I'm pretty sure the board is not operating properly anyway, could it's lack of proper function be not providing enough of a load to pull the +5 down where it should be?
I really need to make sure my power is right before I try tackling board issues....
