Voltage problem with Ice Tube Clock

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altezzroc
 
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Voltage problem with Ice Tube Clock

Post by altezzroc »

The last step I did before taking a break for a few days was putting in the zener diode. Upon returning to my assembly, it will no longer beep when plugged in, and my DC readings are all either 3 at the bottom pin of the 7805 or 0 at any other location. Image
Image

adafruit
 
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Re: Voltage problem with Ice Tube Clock

Post by adafruit »

is the fuse hot?

altezzroc
 
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Re: Voltage problem with Ice Tube Clock

Post by altezzroc »

yea, it is.

adafruit
 
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Re: Voltage problem with Ice Tube Clock

Post by adafruit »

you have a short!
remove the IC
check for backwards capacitors
or wires that are touching that ought not to be

pstemari
 
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Re: Voltage problem with Ice Tube Clock

Post by pstemari »

Caps all look right, but, looking at the top of the board, almost all of the resistors and diodes appear to have questionable solder joints--the holes aren't filled and the lead on the top isn't wetted with solder. Also, check that the leads of the diode near the power jack aren't touching the tab on the voltage regulator and that the resistor leads near S5 aren't shorted on the back of the board.

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stinkbutt
 
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Re: Voltage problem with Ice Tube Clock

Post by stinkbutt »

Red arrows point to joints that are suspect. Blue arrows point to joints that look ok.

Of course you can't guarantee that you've got a bad joint in the spots pointed to by red arrows, there are false positives there. But the blue arrows are rarely pointing to false negatives.
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Either way, however, Ladyada's point is probably correct: If your fuse is getting hot then you've probably got a short which has little to do with any bad joints. Still, if you eliminate the short and you still have problems, then it's probably a cold joint somewhere amongst the red arrows. Or some others that I couldn't see.

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