need troubleshooting help

aragorn723 · 8734

« previous next »
Pages: 1 2 3   Go Down

0 Members and 1 Guest are viewing this topic.

Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
on: January 25, 2015, 12:15:32 PM
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


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19933
Reply #1 on: January 25, 2015, 12:49:48 PM
Are there any voltages that are out of spec?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #2 on: January 25, 2015, 01:06:17 PM
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
« Last Edit: January 25, 2015, 01:14:54 PM by aragorn723 »


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19933
Reply #3 on: January 25, 2015, 01:16:05 PM
You can take voltage measurements and compare them against the standard Quickie manual, as they should be pretty close.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #4 on: January 25, 2015, 01:17:20 PM
ok, so it is safe to skip the resistance measurements?


Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #5 on: January 25, 2015, 02:30:27 PM
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
« Last Edit: January 25, 2015, 02:44:23 PM by aragorn723 »


Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #6 on: January 26, 2015, 12:15:40 PM
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


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19933
Reply #7 on: January 26, 2015, 03:46:10 PM
Try putting the old caps back.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #8 on: January 26, 2015, 04:52:02 PM
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


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19933
Reply #9 on: January 26, 2015, 05:02:21 PM
You can run the Quickie without that cap and measure the voltages again.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Bonzo

  • Sr. Member
  • ****
    • Posts: 251
  • My name is Marco, best known as Bonzo
Reply #10 on: January 26, 2015, 07:22:43 PM
Did you check the polarity of those caps?
I had lots of problem when building my quickie the first time.

Bisogna avere orecchio!

Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #11 on: January 27, 2015, 12:29:48 AM
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
« Last Edit: January 27, 2015, 12:32:59 AM by aragorn723 »


Offline Grainger49

  • Hero Member
  • *****
    • Posts: 7175
Reply #12 on: January 27, 2015, 02:42:11 AM
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.


Offline aragorn723

  • Hero Member
  • *****
    • Posts: 1032
Reply #13 on: January 27, 2015, 05:46:55 AM
Hi Grainger,

I'll have to give that a try..  Got a bunch of those lying around.  Thanks,

Dave


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19933
Reply #14 on: January 27, 2015, 08:13:10 AM
Quote from: Caucasian Blackplate on January 26, 2015, 05:02:21 PM
You can run the Quickie without that cap and measure the voltages again.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Pages: 1 2 3   Go Up
« previous next »