DOD - FX22 Vibro Thang  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

DOD - FX22 Vibro Thang

Postby sikheazdraf » 01 May 2009, 11:35

hi everyone i was wondering if you guys can help me with my DOD fx22 Vibro Thang
i got it cheap and has issues with its bypass.. etc...
i think there's problems with the wirings and etc...
i hope that somebody would help me
and could be kind to post gut shots of the insides of the pedal
and also the schematic.. thanks!..
:)

my vibro thang looks exactly like this:
Image
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby puppiesonacid » 01 May 2009, 12:09

check out schematic heaven. I believe its there. if not pm me. I might have it in my dod folder.
puppiesonacid
Cap Cooler
 
Posts: 651
Joined: 02 Apr 2008, 15:41
Has thanked: 1 time
Have thanks: 5 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby modman » 01 May 2009, 12:18

schematic is not at schematicheaven, might be worth taking pictures of the pcb even if the wiring is messed with.

moved to request
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4301
Joined: 19 Jun 2007, 17:57
Has thanked: 3108 times
Have thanks: 546 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby Fuzzer » 01 May 2009, 17:19

puppiesonacid wrote:check out schematic heaven. I believe its there. if not pm me. I might have it in my dod folder.


If you have it why not post it?
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.
User avatar
Fuzzer
Transistor Tuner
 
Posts: 1037
Joined: 16 Sep 2007, 16:17
Has thanked: 0 time
Have thanks: 19 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 02 May 2009, 09:30

modman wrote:schematic is not at schematicheaven, might be worth taking pictures of the pcb even if the wiring is messed with.

moved to request


yep i cant find it there :(
thanks...!

anyway here's the gut shot of my DOD and the wiring. i don't know what's wrong with it though :( :oops:
Image
hope i could fix it with the help of you guys. thanks!
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby puppiesonacid » 02 May 2009, 17:26

Fuzzer wrote:
puppiesonacid wrote:check out schematic heaven. I believe its there. if not pm me. I might have it in my dod folder.


If you have it why not post it?



cuz I was at work when I posted :roll:

checked my folder... no such luck. don't know where I've seen it but I know its out there somewhere. If i come across it, I'll post it.
puppiesonacid
Cap Cooler
 
Posts: 651
Joined: 02 Apr 2008, 15:41
Has thanked: 1 time
Have thanks: 5 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby lolbou » 02 May 2009, 23:04

The cut yellow wire seems weird to me, unless it's factory done...

Where's the switching system?

Is the switching like the boss pedals? Is it related to this yellow wire? Is Q4 and its neighbour part of the boos-like switching system?
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
User avatar
lolbou
Old Solderhand
 
Posts: 2715
Joined: 18 Nov 2008, 22:38
Has thanked: 347 times
Have thanks: 240 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 03 May 2009, 00:14

lolbou wrote:The cut yellow wire seems weird to me, unless it's factory done...

Where's the switching system?

Is the switching like the boss pedals? Is it related to this yellow wire? Is Q4 and its neighbour part of the boos-like switching system?


i dont have any idea sir if the wire is factory done.
the switching system is found at the other side.
sorry but i dont really know a lot about electronics though :(
my friend's the one who'd help to work on this though. hehe
but we dont have an idea yet.. how.. hehe
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby borislavgajic » 03 May 2009, 09:09

can you post some pictures of copper side ...

thanks

boris
borislavgajic
Opamp Operator
 
Posts: 1553
Joined: 27 Feb 2008, 15:23
Location: Sombor , Serbia
Has thanked: 140 times
Have thanks: 248 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 03 May 2009, 17:12

borislavgajic wrote:can you post some pictures of copper side ...

thanks

boris


here they are..
Image
Image
Image
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 05 May 2009, 12:00

help! :cry:
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby lolbou » 05 May 2009, 12:10

It looks like a FET switching (nothing mechanical here).

sikheazdraf wrote:has issues with its bypass.. etc...


Can you detail your issue? Always on? Always bypassed? LED always on, or changing its state, but with no effect on the sound??
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
User avatar
lolbou
Old Solderhand
 
Posts: 2715
Joined: 18 Nov 2008, 22:38
Has thanked: 347 times
Have thanks: 240 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby Dirk_Hendrik » 05 May 2009, 17:45

lolbou wrote:It looks like a FET switching (nothing mechanical here).

Naturally, It's a DOD in "modern" style ;)
Is that a 4011 or a 4007 I see. Most DOD's have a 4007 vor their bypass switching/

lolbou wrote:
sikheazdraf wrote:has issues with its bypass.. etc...


Can you detail your issue? Always on? Always bypassed? LED always on, or changing its state, but with no effect on the sound??


My Q exsactly
Sorry. Plain out of planes.

http://www.dirk-hendrik.com
User avatar
Dirk_Hendrik
Old Solderhand
 
Posts: 4178
Joined: 03 Jul 2007, 09:44
Location: Old Amsterdam
Has thanked: 251 times
Have thanks: 1010 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby Dirk_Hendrik » 05 May 2009, 17:47

4007.
Meaning that for the functioning of the bypass system about any DOD schematic that uses a 4007 applies.
Sorry. Plain out of planes.

http://www.dirk-hendrik.com
User avatar
Dirk_Hendrik
Old Solderhand
 
Posts: 4178
Joined: 03 Jul 2007, 09:44
Location: Old Amsterdam
Has thanked: 251 times
Have thanks: 1010 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 05 May 2009, 17:53

lolbou wrote:It looks like a FET switching (nothing mechanical here).

sikheazdraf wrote:has issues with its bypass.. etc...


Can you detail your issue? Always on? Always bypassed? LED always on, or changing its state, but with no effect on the sound??


here it is.. sorry for the bad quality..
http://tinypic.com/player.php?v=bjsi1&s=5
you could hear that when the pedal is chained theres a BIIIIG drop in volume!.. even without engaging it!..i think its the bypass?
and my humbucker equipped guitar sounded like a single coil guitar. :(
see the difference between when the DOD is chained and when the guitar is directly pluged in the amp.

thanks guys! :P
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 06 May 2009, 22:05

help! :|
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby puppiesonacid » 06 May 2009, 23:22

impedence mismatching??? idk... thats wierd...
puppiesonacid
Cap Cooler
 
Posts: 651
Joined: 02 Apr 2008, 15:41
Has thanked: 1 time
Have thanks: 5 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby Fuzzer » 09 May 2009, 01:54

I'd put the blame on the Dual Opamp, because that's the one affecting the signal when the effect is activated, as well as when it isn't.

This is a rough guess, of course, but Dirk Hendrik's appreciation is just spot on, you should dig some DOD schematics from that series to have a better approach.
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.
User avatar
Fuzzer
Transistor Tuner
 
Posts: 1037
Joined: 16 Sep 2007, 16:17
Has thanked: 0 time
Have thanks: 19 times

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby sikheazdraf » 11 May 2009, 18:35

Fuzzer wrote:I'd put the blame on the Dual Opamp, because that's the one affecting the signal when the effect is activated, as well as when it isn't.

This is a rough guess, of course, but Dirk Hendrik's appreciation is just spot on, you should dig some DOD schematics from that series to have a better approach.


thanks sir.. what should i do with it sir?
User avatar
sikheazdraf
 
Posts: 9
Joined: 01 May 2009, 09:54
Has thanked: 0 time
Have thanks: 0 time

Re: HELP!! DOD FX22 Vibro Thang GUTS & SCHEM

Postby Fuzzer » 11 May 2009, 23:06

Take it out, put a socket in and then try another one.
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.
User avatar
Fuzzer
Transistor Tuner
 
Posts: 1037
Joined: 16 Sep 2007, 16:17
Has thanked: 0 time
Have thanks: 19 times

Next

Return to Modern Stompbox Effects (1975 - ...)

Who is online

Users browsing this forum: ABtheBassPlayer, Devinocampo and 13 guests