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not getting 5.333
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not getting 5.333

by fatjoebear on Fri Oct 28, 2005 3:45 am

I just got #166, have the power supply done. Every voltage is correct except where i should be getting 5.333v, I'm only getting between 4.50 and 4.87v the whole range of tw6. I walked away and came back a couple hours later, check everything again and still the same, anyone got any ideas


Thanks in advance
fatjoebear
 
Posts: 6
Joined: Fri Oct 28, 2005 3:26 am

by Guest on Fri Oct 28, 2005 7:51 pm

check the voltage drops across the four diodes d44 though d47
they should all be around .6
also make sure that you have the correct components in
r4 r5 and tm6 and that they are soldered well
Guest
 

by moogah on Fri Oct 28, 2005 10:19 pm

Yes, post back once you've checked you components againts the BOM and the schematic and then I'll provide some measurements of my PSU for you to compare with.
moogah
 
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Joined: Sun Jun 19, 2005 8:51 pm

by fatjoebear on Sat Oct 29, 2005 4:49 am

yea, had r5 as the wrong value, fixed that and the power supply is working great. like some other people on here i built the ps first, tested that, and finished the rest of the kit with out testing. big shock, no audio output from the headphones or mix out. went back over the boards 5 times looking for wrong or reversed parts, everything looks good. i think my problem may be the large amount of flux residue on my board. im gonna give my board a good cleaning then take it to where i used to go to school because they have a scope, counter, all that nice stuff. wish me luck.

thanks for all the help thus far
fatjoebear
 
Posts: 6
Joined: Fri Oct 28, 2005 3:26 am

by Jonnay on Sat Oct 29, 2005 12:58 pm

Something that might help is testing each section individually. I.e. Check the VCO, then the VCF, and wokr your way upwards.
Jonnay
 
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Please be positive and constructive with your questions and comments.