Rando_calrissian
Member
I just finished the build but it won’t power on where should I start?
Muzzle won’t power on
- Thread starter Rando_calrissian
- Start date
spend some time reading through the forum posts about troubleshooting pedals that don't work. learn how to use your digital meter if you do not already know. after you get an idea of the process that people use to help pinpoint PCB issues, and after you use the forum discussions to help you look at your wiring to see if you think it is done correctly, post a bit more information along with clear pictures of both sides of your PCB and one showing your wiring to the power and in/out jacks.
unless something obvious jumps out in those pictures, you will be asked to confirm part values, clean off any residue on your board, and to provide updates if any of those steps make a difference.
unless something obvious jumps out in those pictures, you will be asked to confirm part values, clean off any residue on your board, and to provide updates if any of those steps make a difference.
BuddytheReow
Breadboard Baker
Post some pics too. How do you know it won't power on besides no sound. The LED wont light up? Does it work in bypass?
Rando_calrissian
Member
Found the power issue it was a broken wire but now it seems as it is in permanent gate mode and won’t open I will post pictures soon
Rando_calrissian
Member
It passes signal with no issue in bypass
Rando_calrissian
Member
Also the 2 2n3904s on the left side are getting pretty hot
It’s really difficult to see anything in that picture. Unfortunately sometimes you have to take it out of the enclosure to get better pictures. Are you sure those gigantic caps aren’t shorting anything?
also by permanent gate mode do you mean it is completely silent? Or does it make a little noise but still gating?
i don’t think the transistors are supposed to get hot that could be your issue. Before you start replacing parts I would really look it over solder bridges that may be shorting or cold joints
also by permanent gate mode do you mean it is completely silent? Or does it make a little noise but still gating?
i don’t think the transistors are supposed to get hot that could be your issue. Before you start replacing parts I would really look it over solder bridges that may be shorting or cold joints
Rando_calrissian
Member
yes it is silent,
I’m currently going through the schematic and following with a signal generator so see where the signal stops currently at pin 17 on the that4301 I get a square wave at .8mv where at input I have 3v
At the output of that section pin 13 on the that I have 0
I’m currently going through the schematic and following with a signal generator so see where the signal stops currently at pin 17 on the that4301 I get a square wave at .8mv where at input I have 3v
At the output of that section pin 13 on the that I have 0
Rando_calrissian
Member
Also pin 1 of the tl072 gives 0 voltage
Rando_calrissian
Member
Also the light stays on and won’t change no matter where the threshold is set
BuddytheReow
Breadboard Baker
Pin 1 for a tl072 is the input signal. There may be a short somewhere prior to that. Pin 8 will have in the input voltage so that should be around 9v
Rando_calrissian
Member
From the schematic it looks like a closed loop feeding into pin 5 of the that4301
Rando_calrissian
Member
Pin 4 on the that also has 0 output but pins 1 and 2 have signal in I’m feeding a 1k sin wave at 2vp
And pin 2 has 200mv pin 1 has 480 mv
And pin 2 has 200mv pin 1 has 480 mv
Rando_calrissian
Member
Also my negative sources that should be -9v are reason -2.5v
Similar threads
- Question
