Flunked Voltages on Power Supply PCB [resolved]

S

suttonri

New member
I get 11.9v dc when I should 6.75. I get 175 where I should get 275. Everything is in the proper socket with the proper polarity. I've resoldered whatever I thought looked dodgy, cleaned anything that looked close to a dolder bridge, and cleaned the faint solder splatter with isopropyl alcohol & my fingernail. What next? Some of the solder joints still don't look stellar but I can't seem to improve them.

Thx,
RS
 

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Cardas quad eutectic at 700F. I had trouble getting it to flow at 650. Tips are clean and tinned with tip size scaled to the hole size. No flux, except I used a dab of Qualitek PF400 for some redo's.
 
suttonri said:
Cardas quad eutectic at 700F. I had trouble getting it to flow at 650. Tips are clean and tinned with tip size scaled to the hole size. No flux, except I used a dab of Qualitek PF400 for some redo's.
Click to expand...
What solder station are you using? PB has posted about it being easy to change calibration on a Hakko station when you think you are changing the temperature. Cardas quad eutectic should flow better than that. It is my favorite solder too.
 
@kgoss is right on the money, I'd bet on a Hakko station having its calibration adjusted rather than temp. You should go all the way hot and reflow those joints, and you'll see the solder suck into the board when it flows all the way out, and everything should work properly. I have to look up the temperature adjustment procedure on my FX888D every time I do it to avoid accidentally adjusting the calibration instead!
 
To perform a factory reset on a HAKKO FX-888D, turn the power off, then turn it back on while holding both the UP and ENTER buttons. The display will show a flashing "A" (Asia/Celsius) or "U" (USA/Fahrenheit). Use the UP button to select your desired region and the ENTER button to confirm.
 
Voltages now good @ 6.3 & 375! Close this one out!

Just in case it can help anyone down the road, I really needed to get the 270 ohm, 5W resistors right to get the 6.3V to move down from 11.5.
 
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