Author Topic: Rustbucket Help  (Read 379 times)

Vtguy22

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Rustbucket Help
« on: March 15, 2020, 11:28:29 AM »
Hello,
  I am trying to debug my Rustbucket and am not having much luck.  The bypass seems to work fine, as does the blend.  No effect seems to be coming through though.  Below are my voltages and pics.  Any help would be appreciated.

IC1
1  0
2  0
3  0
4  -14.6
5  0
6  -1.8
7  .46
8  14.68

IC2
1  12.58
2  0
3  0
4  -14.6
5  -2.5
6  -1.8
7  14.68
8  12.20

IC3
1  0
2  0
3  0
4  -14.6
5  0
6  0
7  -.5
8  14.7

IC4
1  0
2  0
3  0
4  -14.6
5  0
6  0
7  .9
8  14.7

IC5
1  -7.3
2  -7.3
3  -7.3
4  0
5  0
6  0
7  -14.6
8  -14.6
9  -14.6
10  -7.2
11  -8.8
12  -14.6
13  -7.4
14  0

IC6
1  0
2  -7.1
3  -2.4
4  -13.5
5  -14.6
6  -8.8
7  -13.8
8  -13.8

IC7
1  0
2  14.5
3  0
4  0
5  0
6  1.8
7  0
8  0
9  0
10  0
11  0
12  0
13  14.55
14  14.55

IC8
1  0
2  0
3  14.4
4  0
5  0
6  1.8
7  0
8  0
9  0
10  0
11  0
12  14.5
13  0
14  14.5

IC9
1  0
2  0
3  0
4  -14.6
5  0
6  0
7  0
8  14.6

IC10
1  0
2  0
3  11.7
4  0
5  14.4
6  14.4
7  0
8  14.5

IC11
1  0
2  0
3  0
4  -14.6
5  -14.6
6  0
7  14.6
8  0

IC12
1  -14.2
2  0
3  0
4  -14.6
5  -14.4
6  0
7  14.7
8  0

IC13
1  5.09
2  0
3  -14.6
4  0
5  14.7


Q1
  .98
  1.3
  -2.5
Q2
  0
  -.5
  -1
Q3
  .88
  1.49
  .92
Q4
  .88
  1.48
  1.8
Q5
  0
  72mv
  -14.4
Q6
  .48
  0
  -5.2
Q7
  -14.6
  -14.6
  -14
Q8
  -14.6
  -14
  -14.6


Thank You,
Paul.

Scruffie

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Re: Rustbucket Help
« Reply #1 on: March 15, 2020, 11:38:02 AM »
You need to re-flow that board first, I can see several cold joints.
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Vtguy22

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Re: Rustbucket Help
« Reply #2 on: March 16, 2020, 02:40:11 PM »
Thanks, did that, it behaves the same.

jimilee

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Re: Rustbucket Help
« Reply #3 on: March 16, 2020, 03:42:36 PM »
The above picture shows a missing a transistor, is it still missing.


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Scruffie

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Re: Rustbucket Help
« Reply #4 on: March 16, 2020, 03:52:58 PM »
Obviously Jimi's point is very important (nice catch!) but if it is installed, did your voltages change with the re-flow?
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Vtguy22

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Re: Rustbucket Help
« Reply #5 on: March 17, 2020, 04:22:56 PM »
Thanks, yup it was there for testing.

The voltage changes were small, here are the new values:

IC1
1  0
2  0
3  0
4  -14.6
5  0
6  -1.4
7  .52
8  14.68

IC2
1  12.58
2  0
3  0
4  -14.6
5  -2.5
6  -1.8
7  14.68
8  12.20

IC3
1  0
2  0
3  0
4  -14.6
5  0
6  0
7  -.5
8  14.7

IC4
1  0
2  0
3  0
4  -14.6
5  .44
6  .46
7  1.07
8  14.7

IC5
1  -7.3
2  -7.3
3  -7.3
4  0
5  0
6  0
7  -14.6
8  -14.6
9  -14.6
10  -7.2
11  -8.8
12  -14.6
13  -7.4
14  0

IC6
1  0
2  -7.1
3  -2.4
4  -13.5
5  -14.6
6  -8.8
7  -13.8
8  -13.8

IC7
1  0
2  14.5
3  0
4  0
5  0
6  2
7  0
8  0
9  0
10  0
11  0
12  0
13  14.55
14  14.55

IC8
1  0
2  0
3  14.4
4  0
5  0
6  2
7  0
8  0
9  0
10  0
11  0
12  14.5
13  0
14  14.5

IC9
1  0
2  0
3  0
4  -14.6
5  0
6  0
7  0
8  14.6

IC10
1  0
2  0
3  11.7
4  0
5  14.4
6  14.4
7  0
8  14.5

IC11
1  0
2  0
3  0
4  -14.6
5  -14.6
6  0
7  14.6
8  0

IC12
1  -14.2
2  0
3  0
4  -14.6
5  -14.4
6  0
7  14.7
8  0

IC13
1  5.09
2  0
3  -14.6
4  0
5  14.7


Q1
  .98
  1.3
  -2.5
Q2
  0
  -.5
  -1
Q3
  .88
  1.49
  .92
Q4
  .88
  1.48
  1.8
Q5
  0
  140mv
  -14.4
Q6
  .48
  -.5
  -6.3
Q7
  -14.6
  -14.6
  -14
Q8
  -14.6
  -14
  -14.6