Help! Debugging Small Stone

[craig_in_tx]

Hey guys,

Would appreciate any help you can give me debugging my Small Stone.  The layout is from Tonepad : http://www.tonepad.com/getFile.asp?id=7
There is signal when the pedal is engaged, but no phasing at all...just a more or less clean guitar signal.  The depth switch will change the tone a little bit but otherwise there is little to no change from the clean signal when the pedal is off.  I've fiddled with the trim pots but not much happening there, either.

I ordered my IC's from Mouser and they didn't carry the CA3080's but listed the NTE996 as a replacement which I ended up using. 

Here's the voltages I gathered....rate knob was turned full clockwise and I was using a 9v adapter which measured 9.02 v on the meter.

Transistors:

Q1 2N5088
E = 2.25
B = 2.67
C = 6.34

Q2 2N5087
E = 6.95
B = 6.34
C = 6.37

Q3 2N5088
E = 3.45
B = 3.95
C = 6.93

Q4 2N5088
E = 2.87
B = 3.85
C = 6.95

Q5 2N5088
E = 3.44
B = 3.94
C = 6.93

Q6 2N5088
E = 2.86
B = 3.44
C = 6.96

Q7 2N5088
E = 3.45
B = 3.94
C = 6.93

Q8 2N5088
E = 2.87
B = 3.45
C = 6.95

Q9 2N5088
E = 6.34
B = 0.68
C = 6.95

Q10 2N5088
E = 3.15
B = 6.34
C = 6.95

Q11 2N5087
E = 3.55
B = 2.89
C = 2.89

Q12 2N5087
E = 3.55
B = 2.89
C = 3.52

Q13 2N5088
E = 1.31
B = 1.81
C = 6.93

Q 14 2N5088
E = 0.71
B = 1.31
C = 2.90

IC's:

IC1 NTE996
1 = 0
2 = 0
3 = 2.85
4 = 0
5 = 0.65
6 = 3.95
7 = 6.95
8 = 0

IC2 NTE996
1 = 0
2 = 2.85
3 = 2.95
4 = 0
5 = 0.65
6 = 3.93
7 = 6.95
8 = 0

IC3 NTE996
1 = 0
2 = 2.85
3 = 2.85
4 = 0
5 = 0.65
6 = 3.94
7 = 6.95
8 = 0

IC4 NTE996
1 = 0
2 = 2.85
3 = 2.85
4 = 0
5 = 0.65
6 = 0.68
7 = 6.95
8 = 0

IC5 NTE996

1 = 0
2 = 2.88
3 = 2.88
4 = 0
5 = 0.53
6 = 1.81
7 = 6.95
8 = 0

I took some pics of the PCB but unfortunately cannot find my USB cable to upload them from my camera.  As soon as I unearth it I'll post pictures as well.  Appreciate any and all replies.  Thanks!

[oskar]

~7V looks like a plausible voltage on the ICs (pin 7) given there is a 470R resistor in series with the battery/adapter.
Your unit draws ~4mA right now. IC1 is having a problem with pin2 voltage. should be around Vbias 2.9V.
It either isn't getting any ( open connection to the 1k resistor... solder ) or something is pulling the pin down ( shorted to ground ).
You seem like a thorough person given you took the time to do all the voltage readings you did...
So I guess open connection...      shorts are just slightly more sloppy though...   
Measure IC1 resistance to Vbias and it should be 1k.

[oskar]

Did some homework.

IC1 NTE996
1 = 0
2 = 0             <--------  Should be ~2.9
3 = 2.85
4 = 0
5 = 0.65
6 = 3.95
7 = 6.95
8 = 0


Q4 2N5088
E = 2.87      <--------    Should be feeding IC1 pin2!
B = 3.85
C = 6.95

Q4 should be providing IC1 pin2 with voltage if the 1k is "open". Either you got a bad reading or there is a short to ground or pin 2 isn't in contact/ bad solderjoint. (test for continuity joint/leg).

IC4 NTE996
1 = 0
2 = 2.85
3 = 2.85
4 = 0
5 = 0.65
6 = 0.68           <------- IC 1-3 are putting out ~4V 
7 = 6.95
8 = 0

Q9 2N5088
E = 6.34
B = 0.68      <---- !!! ( same place )
C = 6.95               

Check the cap on the output. 6n8. Check for continuity. The output from an OTA which that chip is, is a current. It needs to see a resistance and in this case that is the cap. It could be shorted.

Q11 2N5087
E = 3.55
B = 2.89
C = 2.89

Q12 2N5087
E = 3.55
B = 2.89
C = 3.52

Yuck. PNP's... I don't know what they are supposed to show but they belong to...

IC5 NTE996

1 = 0
2 = 2.88
3 = 2.88
4 = 0
5 = 0.53
6 = 1.81
7 = 6.95
8 = 0

...Which is part of the LFO. Is it doing anything? Are the voltages moving on pin 5 of IC's 1 - 4?