EH small stone issue j question?

[fatfoot51]

Hello everyone~ Hopefully I've asked the question correctly.. Thanks ahead of time for all your assistance with this post.. I'm not an engineer so if I'm missing something I'll try to explain to the best of my ability...
Here is the checklist to fill out:
1.What does it do, not do, and sound like? The box passes signal but no effect..
2.Name of the circuit = Electro Harmonix Small Stone issue j
3.Source of the circuit (URL of schematic or project) = Stock factory.. Link to schematic http://www.montagar.com/~patj/smlstone.gif
4.Any modifications to the circuit? yes
5.Any parts substitutions? Instead of 2n5087 or 2n5088 it uses bc239 and bc309
6.Positive ground to negative ground conversion?  No
7.Turn your meter on, set it to the 10V or 20V scale. Remove the battery from the battery clip. Probe the battery terminals with the meter leads before putting it in the clip. What is the out of circuit battery voltage? =>  8.9vdc
 
ic1
1. 1.7-1.9
2. 4.2-6.9
3. 4.2-6.9
4. 0
5. .57
6. .62-.73
7. 8.3-8.5
8. 5.2-7.0
ic2
1.  4.19-4.23
2.  3.0-3.07
3.  3.0-3.07
4.  0
5.  .60-.66
6.  3.08-3.12
7.  8.3-8.5
8.  8.3-8.5
ic3
1.  6.03-6.06
2.  3.03-3.06
3.  3.03-3.06
4.  0
5.  .59-.63
6.  4.7-4.8
7.  8.3-8.5
8.  8.3-8.5
ic4
1.  4.0-4.1
2.  3.02-3.07
3.  3.02-3.07
4.  o
5.  .59-.66
6.  2.9-3.02
7.  8.3-8.5
8.  8.3-8.5
ic5
1.  .01-.03
2.  2.9-3.0
3.  2.9-3.0
4.  0
5.  .59-.66
6.  1.2-1.29
7.  8.3-8.5
8.  8.3-8.5
bc309
C: 4.5-4.6
B: 7.7-7.9
E: 8.3-8.5
bc239
C: 7.7-7.9
B: 2.83-2.89
E: 2.39-2.45
bc309
C: 3.2-7.0
B: 5.1-7.0
E: 4.2-7.0
bc309
C: 4.2-7.0
B:4.2-7.0
E: 4.2-7.0

Additional notes: For purposes of measuring voltages I arbitrarily assigned numbers to the ics in relation to the distance from the potentiometer. Ic1 being the closest and ic5 being the furthest away on the solder side... Ic3 being the middle on the right and ic 2 being the middle on the left.. Sorry if that is confusing... When I audio probed pin 1 and pin six I get sound on ic2 and ic4 on both pins.  I get sound on ic 5 on pin 1 only and I get nothing on ic 3 for either... That's all I know... Plus any handling tips on the electrostatic sensitive ca3094 would also be helpful! Thanks again!

[PRR]

> Stock factory

Sorry, not clear. Is this EH-built or "you built"? (Are we looking for E-H mistakes, hard-life failures, or DIY-type mistakes?)

> any handling tips on the electrostatic sensitive ca3094 would also be helpful!

Do Not Probe CA3094 Pin 5 !!

The voltage here tells us almost nothing; and careless jabs CAN fry this un-protected input!

This is a devilishly tricky circuit and I don't understand some of it. But I've sorted some bits that *may* help others who know the circuit better.

Your "IC1" is the oscllator. Your "IC2" to "IC5" are the shifty stages, and all are *identical*, so we should see the same voltages at all four chips.

I'm not sure why your "8.9vdc" battery drops to "8.3-8.5" when connected; this circuit should not draw that much power. Or why all your voltages show a range. That may really be what's happening (I got a sick 'scope bopping 290V-340V), or it may be a weak battery which is falling-off more while you are probing (which makes comparisons into guesswork).

I've re-ordered your table to show IC2-IC5 voltages by pin numbers.

Pin 3 on every IC2-IC5 is tied to "Vref" so they should all be the same and steady.
Pin 3 ---  looks OK if battery is dropping from IC2 to IC5
ic2 3.0-3.07
ic3 3.03-3.06
ic4 3.02-3.07
ic5 2.9-3.0

Pin 2 "should" follow Pin 3 by opamp action; but if it doesn't, it will only be 0.16V off due to 1K+27K divider action.
Pin 2 ---  looks reasonable, but.....
ic2 3.0-3.07
ic3 3.03-3.06
ic4 3.02-3.07
ic5 2.9-3.0

Pin 6 "should" follow Pin 3 by opamp action; but if it doesn't, it is liable to go anywhere.
Pin 6
ic2 3.08-3.12
ic3 4.7-4.8   ****
ic4 2.9-3.02
ic5 1.2-1.29  ****

Pin 1 "should" sit 1.2V higher than Pin 6 by Darlington action.
Pin 1
ic2 4.19-4.23
ic3 6.03-6.06
ic4 4.0-4.1
ic5 .01-.03   ****

IC3 output (pins 6 and 1) is stuck high for no apparent reason. I suspect its 27K is not really connected, OR that pins 2 and 3 are shorted.

IC5 pin 1 may be shorted to ground, though it is odd that its pin 6 is sitting 1.2V higher. (If you have reversed these numbers, then it makes sense.) Look for short pin 6 or pin 1 to ground, OR that pins 2 and 3 are shorted.

ic3
2. +in  3.03-3.06
3. -in  3.03-3.06
1. buff 6.03-6.06
6. out  4.7-4.8
ic5
2. +in  2.9-3.0
3. -in  2.9-3.0
1. buff 0.01-0.03
6. out  1.2-1.29

[fatfoot51]

Thanks Paul! It gives me something to look for! You mean pins two and three shorted together or to ground? Sorry I'm new.. Also by stock factory I mean original Electro harmonix.. Not quite a hard life but worked before.. Not a diy..  Also how would I handle a chip if I were to install one? I guess I'm getting too far ahead.. I will check the shorts soon.. Thanks again..

[fatfoot51]

Hi paul~ As of right now I know that pins 1 and 6 on ic5 are not pulled down to ground.. Also pins 2 and 3 aren't shorted together on ic3 or ic5, if that is what you meant... On the three resistors in parallel between ic3 and ic5, one of the legs is grounded but I didn't look at the print.. Maybe it should be I'm not sure but I'll try to check again... I appreciate the help so far!