EgoDriver Issue

[teknoman2]

I just change Ic and I measured them again

and I have 9v on pin 8, 4.37 on pins all pins except pin 4.

[teknoman2]

Also I measured the transistrors on all pins they are 4.36V

[mgwhit]

Aslo I took the multi-meter and I noticed that the IN is grounded is that correct?

The PCB input pad should be grounded when the effect is bypassed, but if it is grounded when the effect is engaged, then that is a problem and would match the description of your problem.  You have a pretty large solder blob down there by the input and ground pads.  If that's your problem try cleaning that up with some braid and a hobby knife.

Don't worry about the transistor voltages.  They're just being used as clippers, not amplifiers.  And that sounds about right anyway.  Good luck!

[teknoman2]

You are right when its off the In is grounded instead when is engaged it isnt.

I dont know what to do.....

I believe my pcb etching and soldering werent very good.

[teknoman2]

I think I find the problem but I m not sure,

the positive side of TONE pot and one side of the C8 are grounded.

When I look the layout and the diagramms they arent supposed to be ground

Right?

[mgwhit]

the positive side of TONE pot and one side of the C8 are grounded.

Not sure what you mean "positive side", but lugs 2 and 3 of the Tone pot should always have continuity to ground and, depending upon the rotation of the pot, lug 1  and C8 could have pretty low resistance to ground, too.

[teknoman2]

Lugs 2 and 3 are grounded but I believe lug 1 is not.

When I put the multimeter between ground and lug 1 I hear the buzzer so lug 1 is grounded

in my circuit.

I believe that is the issue or not??

[teknoman2]

I believe its not that one as well. I desolder them and I check the tracks they arent grounded

so thats out.

I dont know what else to do.

If I  post the voltages of the entire circuit maybe are we gonna find any solution??

[mgwhit]

I think your best bet at this point is to build a signal probe as per the earlier post.

[teknoman2]

I would built a test probe the afternoon and

I will post my results later.

Thank you for your time.

[teknoman2]

I just built the rig tester.

Now I must put the audio probe to every component?

How I will realize if something is not working?

I saw the video of JMK but I didn't understand it very well from the point he uses the audio probe.

Thanks again everyone.

[murdog47]

Yep, follow the schematic from the input and see if you loose signal along the way. May help you locate a bad part or other issue.

[mgwhit]

You have to understand the signal flow through the schematic in order to understand the best test points.  For now, start with both leads of C1, both leads of R2, IC1 pin 3, IC1 pin 1 (warning: from this point on the signal should be loud as @#$%!, so keep your amp volume low), IC1 pin 5, IC1 pin 7, Volume pot lug 2.  That's enough to get you started.  Good luck!

[teknoman2]

Thanx again I will post any further progress.

[teknoman2]

I just test my egodriver with my rig test and

I found out that R1,C1,R2 are ok the signal passes through,

instead on C3,C2 and R3 I dont have anything.

I must change all of them (C3,C2 and R3)?

I believe it is better to change them one by one.

What is your opinion?

thanx again