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zerksies
Double Platinum Member
USA
3406 Posts |
 Posted - 02/10/2010 : 01:30:31
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Just picked one up.I have bypassed tone and sound when the led is lite but no Distortion.
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/10/2010 : 02:25:12
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There is *almost* no way the LED can work and distortion not work on the MT-2... this is very interesting!
Do the "dist" and EQ knobs have any effect when the LED is on? |
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AdrianCrash
Copper Member
Venezuela
33 Posts |
Posted - 02/10/2010 : 08:01:10
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| Yesterday a opened my pedals, but the only one that i cant open was my mt-2 really wanted to see how it looks inside the screws on the back plate where really tigth, it f***** up my screwdriver but the pedal is perfect hahaha thanks for the pics. |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 02/10/2010 : 13:01:38
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quote:
Originally posted by Laurie
There is *almost* no way the LED can work and distortion not work on the MT-2... this is very interesting!
Do the "dist" and EQ knobs have any effect when the LED is on?
It might get a little louder but not much different then the bypass signal. and when i turn the volume all the way up i get no sound. but if i back it off a little i get sound a very very little gritty sound more clean then grit. sound like a tube amp just starting to break up. i check for loose connections i didn't see any any hints i can check |
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MervsMods
Bronze Member
USA
133 Posts |
Posted - 02/10/2010 : 13:54:24
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| I had a SD-1 with that same problem. If you have the patience, resolder ALL the wires that connect to the PCB. They become frayed after a while and that was my issue. I would also touch up the solder connections to the ribbon cable. (re heat the solder) This could be your problem as well. Either way it wouldn't hurt to make sure all connections are sound. |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 02/10/2010 : 14:46:56
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Check the IC3 opamp, it might be faulty.
This opamp is before the diodes that generate the distortion, so if the signal is not amplified enough the distortion will sound the way you've described it. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/11/2010 : 03:20:28
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No output with the level at full means there is a fault in an opamp - there is no signal coming from IC2. So which IC has failed needs to be determined.
Make a probe like described here: http://www.bossarea.com/forum/topic.asp?TOPIC_ID=6284
Check for signal on IC3 pin 7, then IC3 pin 1, then IC4 pin 7 then IC4 pin 1, then IC1 pin 1 then IC2 pin 1.
Which is the first point at which there is no signal? LED needs to be on for this test. |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 02/11/2010 : 03:37:49
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quote:
Originally posted by Laurie
No output with the level at full means there is a fault in an opamp - there is no signal coming from IC2. So which IC has failed needs to be determined.
Make a probe like described here: http://www.bossarea.com/forum/topic.asp?TOPIC_ID=6284
Check for signal on IC3 pin 7, then IC3 pin 1, then IC4 pin 7 then IC4 pin 1, then IC1 pin 1 then IC2 pin 1.
Which is the first point at which there is no signal? LED needs to be on for this test.
I am a little snowed in right now and can't get the cap. But i am guessing that i plug this probe into my battery powered pratice amp. ground it using the boss case and use the side with the cap to check for noise, no noise means that the opamp is bad. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/11/2010 : 03:40:14
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quote:
I am a little snowed in right now and can't get the cap. But i am guessing that i plug this probe into my battery powered pratice amp. ground it using the boss case and use the side with the cap to check for noise, no noise means that the opamp is bad.
Yep, that will work. Let us know how you get on? |
Edited by - Laurie on 02/11/2010 03:40:27 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/12/2010 : 03:39:48
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Actually, if you are careful (use low amp volume), you can skip using the cap.
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Pedal Dan
Silver Member
USA
419 Posts |
Posted - 02/12/2010 : 03:46:33
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Ha Zerks, guess we all got hammered on the right coast! 2 feet + here, hope ya got less! |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 02/12/2010 : 18:31:07
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| I am bored and need to get out cuase of the 16 inches of snow i just got. so i will go to radio shack and buy some cheap caps. |
Edited by - zerksies on 02/12/2010 18:39:15 |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 02/13/2010 : 20:07:58
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| I got my new componets, but i am off to radio shack to get parts to make tester. i am not gonna waste good caps on a testing device. plus i need a few switches |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 02/13/2010 : 23:47:02
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Well i built the audio probe today, done alot of soldering.I think i will test it out tomorrow |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 02/16/2010 : 00:16:26
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quote:
Originally posted by Laurie
No output with the level at full means there is a fault in an opamp - there is no signal coming from IC2. So which IC has failed needs to be determined.
Make a probe like described here: http://www.bossarea.com/forum/topic.asp?TOPIC_ID=6284
Check for signal on IC3 pin 7, then IC3 pin 1, then IC4 pin 7 then IC4 pin 1, then IC1 pin 1 then IC2 pin 1.
Which is the first point at which there is no signal? LED needs to be on for this test.
Thanks so far for the help. i don't know which pin would be pin1 or 2 etc. so i checked them all on the opamp. and i got a click or a tick from all of them. So what could be my next step i don't think the opamp is bad |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/16/2010 : 00:35:05
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quote:
Originally posted by zerksies
quote:
Originally posted by Laurie
No output with the level at full means there is a fault in an opamp - there is no signal coming from IC2. So which IC has failed needs to be determined.
Make a probe like described here: http://www.bossarea.com/forum/topic.asp?TOPIC_ID=6284
Check for signal on IC3 pin 7, then IC3 pin 1, then IC4 pin 7 then IC4 pin 1, then IC1 pin 1 then IC2 pin 1.
Which is the first point at which there is no signal? LED needs to be on for this test.
Thanks so far for the help. i don't know which pin would be pin1 or 2 etc. so i checked them all on the opamp. and i got a click or a tick from all of them. So what could be my next step i don't think the opamp is bad
What you need to do... is play through the pedal (LED on) and check for guitar sound on the pins listed above.
Pin 1 on each chip is marked with a dot.
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MT-2 no Distortion
