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mattoqua
Silver Member
Canada
438 Posts |
 Posted - 08/23/2006 : 21:19:54
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I have an MT-2 that ive had for years, I bought it off ebay for $50 a long time ago, worked perfectly all this time. But I was playing with it tonight, and it worked fine. A couple hours later, I pick up my guitar again, and its not working anymore.
So I opened it up trying to find if something was wrong...everything looks fine...I tried it on batterys, still nothing, and the adaptor i have is working fine with all my other pedals. Eventually I took out the adaptor from the wall, and then when i put it back in, the check lit up, started playing, works fine. But now it wont go off.
First I thought just the stomp was broken, but then I noticed that when I unplug and replug the pedal, the check doesnt come on, so now im thinking theres some kind of perminent current flowing through it thats still there when unplugged (no battery btw :P), but disapears when i turn off the whole powerbar.
It makes no sence so I dont know whats wrong with it...has anyone else had this problem, or know how to fix it? |
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stahlhart
Platinum Member
1318 Posts |
Posted - 08/23/2006 : 22:37:58
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It's physically impossible for there to be any "permanent" current in the circuit with both the battery and the AC adapter removed -- what you're probably seeing is a static charge.
Some questions:
-- how were you powering it up until the time it started to not work correctly?
-- you had the pedal connected to an AC adapter, and it wasn't working, but you unplugged the adapter from the wall, then plugged it back in (without disconnecting it from the pedal), and that was when you got the check light back and it was working again (but would not switch off)?
-- "unplug and replug the pedal" -- is this power, or the cable on the input jack?
-- what is "the powerbar" here? an AC outlet strip that you are plugging the adapter into?
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StratoSphere
Double Platinum Member
Canada
2232 Posts |
Posted - 08/24/2006 : 00:05:52
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thats a wierd situation, ive never heard of a pedal doing that before.
a few years ago my SD-1 stopped working. i took it to a repair shop thinking they would fix it for 10 bucks. 60 dollars later, i got my SD-1 back half repaired. i could have gotten a new one for that.
if you really like the effect, i would say just either live with it not working, or get a new one. |
Edited by - StratoSphere on 08/24/2006 00:09:27 |
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mattoqua
Silver Member
Canada
438 Posts |
Posted - 08/24/2006 : 03:34:21
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quote:
-- how were you powering it up until the time it started to not work correctly?
I just used the PSA-120T adaptor, with a daisy chain powering up the MT-2, CE-3, and a crybaby. It was always plugged in, just stomped off when im done playing.
quote:
-- you had the pedal connected to an AC adapter, and it wasn't working, but you unplugged the adapter from the wall, then plugged it back in (without disconnecting it from the pedal), and that was when you got the check light back and it was working again (but would not switch off)?
Yea, first i unplugged it by disconnecting the pedal, and it didnt work, then i plugged it back in, and removed the adaptor from the wall, and then when i plugged it back into the wall is when it went on, but wont turn off.
quote:
-- "unplug and replug the pedal" -- is this power, or the cable on the input jack?
Thats the power. When i was moving my pedals around, or changing the order, I would unplug the daisy chain, and when i put it back in, it would be like all the pedals were on. It didnt happen with the MT-2 this time though.
quote:
-- what is "the powerbar" here? an AC outlet strip that you are plugging the adapter into?
Yea. Its 6 AC oulets that go into the wall using 1 in the wall.
Im getting my CS-3 tommorow (already paid for it), and its coming with an adaptor too, so i can check if its something on the load of the daisy chain using the other adaptor, but i doubt it is since its worked fine all this time.
@ StratoSphere, I could check at the repair shop, but I think theyll overprice it, like they do with everything. If its not possible to fix this one, I would definatly buy a new one, but it still kind of works, so Im thinking theres just something Im missing with it |
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jack
Platinum Member
USA
1418 Posts |
Posted - 08/24/2006 : 03:53:42
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| When using AC adaptors, always plug them into your pedal BEFORE plugging into the outlet before you start playing. When you are done playing, always disconnect from the outlet first, then disconnect from your pedal. If you do it the other way around, you run the risk of there being a spike or surge at the pedal when you plug in or out. If you have it in the pedal, then the wall, any type of spike or surge might mess up your adaptor, but it most likely won't fry your pedal. |
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mattoqua
Silver Member
Canada
438 Posts |
Posted - 08/24/2006 : 04:09:57
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I dont ever unplug the pedals though. I moved them around once, then just put them back to the normal position. When im done playing, I just leave everything there. I turn off my amp, and stomp the pedals to bypass.
I was living somewhere else before, and the plugs were easy to get to then, so I would always just turn off the powerbar (so its like unplugging from the wall), and just leave everything plugged in.
I know it cannot be a surge because it was working before the same night, didnt do anything to the powerbar, and just switched the pedals to bypass. When i went to play again 3 hours later, I just hit on the MT-2 (after the amp was on), but it wouldnt work. |
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mattoqua
Silver Member
Canada
438 Posts |
Posted - 08/25/2006 : 10:55:18
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The pedal fixed itslef...
I have no idea how, but as soon as i added my new pedal, it just started working again.
I didnt open it up or anything, just out of nowhere it was fine again.
I would still be intrested if anyone knows why this happened in case it happens again. |
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boss freak
Gold Member
USA
663 Posts |
Posted - 08/25/2006 : 11:28:34
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Gremlins.  |
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grdlefty
Copper Member
Canada
29 Posts |
Posted - 08/31/2006 : 00:59:00
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CANADIAN gremlins!!!!! |
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mattoqua
Silver Member
Canada
438 Posts |
Posted - 10/27/2006 : 21:32:38
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In case someone is having the same problem, I found the what was wrong with it, but have no idea why it fixed it
The nut around the input jack was loose (just half turn). When i screwed it on tight, everything was working perfectly again
Im not good with electronics, but I know that when something is pluged into the input of the pedal, it starts some current flow, but how can that cause the switch to stop working? |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/28/2006 : 17:59:25
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quote:
Originally posted by mattoqua
In case someone is having the same problem, I found the what was wrong with it, but have no idea why it fixed it
The nut around the input jack was loose (just half turn). When i screwed it on tight, everything was working perfectly again
Im not good with electronics, but I know that when something is pluged into the input of the pedal, it starts some current flow, but how can that cause the switch to stop working?
Hi Mattoqua & Guys
Most, if not all pedals have the negative of the power, switched ON by the Input Jack.
They use a stereo socket & the ring is shorted to the ground by the very fact that you plugged, a plug/lead into the input jack.
That is how the use the socket, as a simple switch.
You stated that <<The nut around the input jack was loose>>
It may be, that the Negative (Ground) connection, that is the part of the nut on the input jack, was not making proper connection through the pedals metal case..... 
I think I typed, what I thought I wanted to say?
if you can't understand this, just let me know.
Moral to this story is:
Make sure your nuts are always tight...  |
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mattoqua
Silver Member
Canada
438 Posts |
Posted - 11/16/2006 : 01:43:40
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It stopped working once again, so this time i decided to open it up fully.
I foud a wire that doesnt go anywhere. Its black, and coming off of the switch. It was rested against it, so i guess it was making the right connection when i stepped on it and it worked (and before 50 stomps probably shook it into place)
Does anyone have a picture of the inside of their MT-2 so i know where to solder the wire too? I cant read schimatics, so i have no idea where to put it.
Heres some info on it if anyone knows where to put it, but doesnt have a picture:
theres 2 ports(?) coming off the switch, one connected to a purple wire, one to black. The purple one goes right to the circuit board to the connection "18". The black one is the wire that goes nowhere.
It looks like it should connect somewhere to the input jack (the left when like i have it). On the input, theres 3 "ports". The one at the back is connected to the battery wire (black) and to the circuit board. The other 2 ports have a grey wire that comes from the circuit board, then splits into black and white, each connected to a port on the input jack.
The output jack only has 1 (white) wire connected to it, so it would make sence that it should go there somewhere, but the wire doesnt reach over there (and it wasnt resting near it).
Thanks in advance |
Edited by - mattoqua on 11/16/2006 03:50:58 |
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Broken MT-2
