No output on M800

[JetFixxxer]

Adjusted all drains J112/PF5102 to 5v.

Looked for cold solders, bridges, and cleaned the bottom.

Verified resistor value again.

 

[music6000]

We Shall Not Surrender !!!!

 

[JetFixxxer]

I'm going to order some J201 and see if that changes anything.

Mouser has some in stock or I might just try SMD w/TO-PCB92. Not sure if 90° header would be better or just the standard header.

 

[Nostradoomus]

You definitely want right angle headers if you’re using adapter boards...most of the time anyway

 

[Chuck D. Bones]

Gate voltage should be zero on Q1. If you measure anything other than zero on Q1's gate, then Q1 is bad. Those source and drain voltages look ok. It's important to check source & drain voltages on each FET. They should always be a few volts apart.

 

[JetFixxxer]

Received my J201 and everything it works. Now in the process of tweaking. I'm pretty close, but will give it a few days of messing around with it.

Also any suggestion on securing the J201 into the sockets better. They feel a little sloppy to me. I was thinking using a glue gun and adding a dab of glue.

 

[zgrav]

Received my J201 and everything it works. Now in the process of tweaking. I'm pretty close, but will give it a few days of messing around with it.

Also any suggestion on securing the J201 into the sockets better. They feel a little sloppy to me. I was thinking using a glue gun and adding a dab of glue.

I have followed a suggestion from another forum member to flow a little bit of solder onto the transistor leads to slightly increase their size for a better fit.

 

[Chuck D. Bones]

Or if you're done swapping JFETs, remove the sockets and solder the JFETs in.

 

[DrumBuster]

Hey! Finally got to check my pedal, is it normal that Q2 to be 2.5v all the way to the trim pot?

 

[Chuck D. Bones]

At one end of the trimpot's travel, Q2-D will be at +9V. +2.5V at the other end is ok. What's most important is finding a place on the trimpot that sounds good.