1 volt low at j4; 4.29 instead of 5.333. ?

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1 volt low at j4; 4.29 instead of 5.333. ?

Post by Guest »

i've been adjusting tm6 but it only varies the voltage between 4.27 and 4.29v. somehow i'm not hitting 5.333.

any ideas?

thanks,
greg

Jonnay
 
Posts: 142
Joined: Thu Jun 02, 2005 12:28 pm

Post by Jonnay »

Are you using the right trim pot?

Guest
 

Post by Guest »

yes, the 2k one.
thanks,
greg

Guest
 

Post by Guest »

check that you are getting .6volt drops across
all of your diodes
also check that r4 and r5 are of the correct values

greg
 

Post by greg »

r4 and r5 are correct according to the fab manual.

i am not getting .6v drops across the diodes though. here is what i get:

d47: 4.3 - 3.89 = .41v
d46: 3.89 - 3.48 = .41v
d45: 3.26 - 2.97 = .29v
d44: 2.97 - 0 = 2.97v

thanks for any suggestions,
greg

Guest
 

Post by Guest »

make sure d44 is orientated correctly
if it is orientated correctly
then it is probably bad
replace it with one of the other diodes from the kit

greg
 

Post by greg »

yay!!!
that worked! finally!
onward!

thanks so much,
greg

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