need troubleshooting help

A

aragorn723

New member
Hi,

I was working on the Quickie today swapping out the 150uf caps, and now one side doesn't work.  Tried switching tubes, and putting in fresh batteries, but one channel is still out.  Been trying to find the PJCCS CD to do some continuity checks, but can't find it anywhere.  Help!

Dave
 
don't know, I can't find the PJCCS manual :P  The only thing I can find is the original quickie 1.1 manual.. Guessing the voltages/resistance values would be different from that.  Should I do some resistance measurements first?  (just need to know what the points, are supposed to be).  Thanks,

Dave
 
You can take voltage measurements and compare them against the standard Quickie manual, as they should be pretty close.

-PB
 
here are the voltage readings (voltages are with the pjccs but against the spec of the quickie 1.1 without pjccs):

1,6 30.5v, 19.9v  spec 29v
2,7 2mv,1.9mv    spec 38v
4,9 223mv, 1.4v  spec 2-3v
5,10 0,0              spec 0,0
RD 1.8v                spec 4v
RC  2.96v              spec 4v


The caps installed in place of the 150uf are 220uf, 4v, black gates.  Thanks,

Thanks,

Dave
 
here are pjccs voltage readings (did some searching on the forum to find the points):

            spec        measurement
IA/IB    37-38v    30.25v/30.25v
A6/B6    9-21V    18.8v/19.74v
A5/B5    2V          -.5mv/-.7mv

Looks like there is something wrong with A5/B5.  Could it be the difference between using the stock caps and 220uf?  The new caps are electrolytic as well-the negative poles are on terminals 5 and 10.  Also, I checked continuity between A5 and the negative D battery terminal, and between B5 and the other D battery terminal, and both were good.  What else could be wrong?

Dave
 
only one problem, i had to cut the leads to get the caps out (the leads were wrapped into the terminals pretty good)..  Guess I need to order some new ones, is that an email to the queen?  Do you think one of the new caps was blown by a turn-on transient of more than 4v?  I measured the voltage across the stock caps before the swap (was ~1.5v) but maybe there is a swing of more than 4v when the Quickie is turned on?

Dave
 
Did you check the polarity of those caps?
I had lots of problem when building my quickie the first time.
 
Hi Bonzo,

Yes, the banded side was installed the same way as stock.  The odd thing was that one side worked but not the other.

Dave
 
I'd suggest that if the stock caps have leads on them you can swap them back in using alligator clip jumpers.

If you don't have any jumpers go to Radio Shack and buy some.  They are a very handy thing to have.  I have a number of them right now working on zeroing in on my tweeter level control.
 
Thanks for all the responses.  I guess the first thing to do is take out the black gates.  After that:
1)  check voltages at A5/B5 without the 150uf cap
2)  check voltages with the 150uf caps in with alligator jumper clips

Hopefully the numbers will be good!

Wish I knew why the numbers were out of whack though, its good to have a root cause on these things :)

Dave
 
Hi,

The numbers with and without the 150uf caps are about the same:

IA/IB    30.1v / 30.1v
A6/B6    29.97v / 19.7v
A5/B5    1.82v / 1.40v

Looks like something funny on the A6??  Any thoughts?

Dave
 
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