EH CLONE THEORY chorus! Need your help for fixing it!!!

[Kleber AG]

Hello all, I'm back from 2 months touring in Europe, great tour...

While in Spain I bought an EH Clone Theory broken by $10euros :lol:
Now i need to fix it, the board looks pretty good, but I have no idea where to start looking, as I have no schem...
Anybody could email me the schem please, if there's more schem versions I'd like to have them all, as to find which really my unit is.
It's the one with the edge switch...
kleberad@hotmail.com
I'm happy to be back!!!
Regards
Kleber AG

[Kleber AG]

I forgot to say, i can hear the natural guitar sound and at some settings I can hear something like a metronome click pulsing and if I turn the knob all the way to vibrato I got no sound...
The board has EH1317A code...

Please, someone can email me the schem?
Kleber AG

[fatoldsun]

you might have to buy that one. schematic connection has all the eh schems. that one is ike 8 or 9 bucks.

[puretube]

it is somewhere out there...

[Marcos - Munky]

Check your e-mail.

[Kleber AG]

Thanks Marcos and Mike!!!  

But I think I have some different version because mine have the "Reticon SAD1024" chip instead of the MN3007 as in the schem and also I'm not sure but mine have the "edge switch" Flanger-Vibrato/Chorus-Vibrato different wired compared to that schem...

Please, anyone that has some info about these could help-me? Is there some other schem version with the Reticon SAD1024???

Best Regards
Kleber AG

[mikeb]

There must be another version around, but I don't have it. I can only suggest finding schematics for another time-based device where there is both a SAD1024 version AND a MN3007 version - likely you can see how they changed from one version to another. I'm sure there is a device like this but it doesn't come to mind .... hmmmm ....

Have you traced through the pedal with an audio probe?

Mike

[Kleber AG]

I tried it with a higher volume, and I can hear the dry guitar, the clock (I think) and the modulation (chorus), the problem I think is that the modulation is without any guitar sound just the noise(like white noise). For me it seems that something somewhere is not ffeding the guitar signal to the chorus(delay) input of the chip...

This is tottaly new to me, I don't have any experience with this... :?

Any hint, or some guidance trhough the signal chain of the pedal... I'm using the audio probe as well.........

Help...
Regards
Kleber AG

[fatoldsun]

have you checked the board over thoroughly for any possible breaks in the traces or maybe even a break in the board? how are you powering the unit?

[Kleber AG]

:cry:  Yes I've checked that all...
It's a 220V(european version) and I'm powering it with 220V of course.
The transformer secondaries have 18V / 0V / 18V.

One more important thing I found the SAD1024 is getting really hot. What pins and voltages I should check at the SAD1024?

I'm going to place an order to Steve Daniels for a new SAD1024, but I'm not sure if it is the problem, and the 1024 is expensive... :cry:

For reference: http://www.geofex.com/sad1024.htm

Definately that schem is nothing like my unit, I think that mine is older (SAD1024 based) instead of MN3007.
I could trace it and draw a schem if I could make it to work...

I've heard only great things about this chorus, I'm sure its worth to fix it...
HELP!
Kleber AG

[Kleber AG]

I followed some tracks that Mark Hammer had helped me and made these measures:
1) Is there any signal to be heard?
Yes the dry guitar, plus some clocking pulse and some noise modulating, as if the chorus would be only modulating noise.

2) Do you get any signal in bypass mode?
Yes the bypassed signal(dry guitar).

3) Is the audible signal (assuming there is one) in bypass mode clean only or is there some sort of distorted delay component?
Yes in the "bypass" mode the sound is clean only(dry) without nothing else.

4) Are all leads to and from the board soldered/connected properly?
I think so, I've checked and it looks to be right. Also the 3 pots are PCB mounted.

5) Do all chips have the appropriate supply voltages on the appropriate pins?
---SAD1024 pins---
1 - gnd 0v
2 - in A 2,5v
3 - 6,7v
4 - n/c 0v
5 - 3,9v
6 - 4,3v
7 - vdd 12,3v
8 - 6,8v

9 - 12,3v
10 - 6,8v
11 - 1,1v
12 - 1,1v
13 - n/c 0v
14 - 6,7v
15 - in B 2,5v
16 - gnd 0v

Pins 3 and 14 are connected, as well as 7/9, 8/10, 11/12
Measured with the SAD1024 in place, then I took the 1024 out and just the pins 5 and 6 changed to 0v.

---CD4047AE pins---
1 - clock pulsing 5,5v
2 - *varying around 6,7,8v
3 - 5v
4 - 13v *connected to pins 5,6
5
6
7 - 0v *connected to pins 8,9,12
8
9
10 - 6v
11 - 6v
12
13 - n/c clock pulsing 5,5v
14 - 12v

Hope it can show something to you because I can't find the problem.

Thanks
Kleber AG

[Kleber AG]

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