SOLVED Need a second set of eyes (Duo-Phase)

[DGWVI]

Hopefully the pics are clear enough

Having an issue with the power delivery on the B side of this latest Duo-Phase- the LFO will not start, but the phase stages work otherwise.


I've gone over everything several times, and have replaced everything in the LFO section and power sections for Side B and kinda stuck on what to do next. The Depth and Trimpots all effect the LEDs as they're expected to, but I get no movement from the LFO

Removed the Feedback pot to make photos easier.



Voltages for the borked side... As you can see I'm getting static negative voltages on both ICs 5B and 6B, even after resoldering, cleaning, replacing (everything, including the switches but, except the sockets), and cleaning again

I also get continuity between IC6B and all three pins of the LFO switchz regardless of which position it's in.


Voltages for the working side


I've gone over everything with a flashlight and magnifier, and see no solder bridges or damaged traces.
Side A works perfectly

 

[DGWVI]

Since this is about food now, I've been getting these from a nearby grocery -


Surprisingly good for how cheap ($1-$4 per pouch). And they're super quick to heat up which has been great with how hectic things have been for me lately.. Not pictured are the naan or ungodly amounts of rice I also eat

 

[steviejr92]

You guys are speaking my language!
I love Thai food too. Those curry chicken skewers with that peanut sauce is insane!

 

[jhaneyzz]

Damn... I'm hungry.

What was this thread about again?

 

[DGWVI]

Damn... I'm hungry.

What was this thread about again?

Basil fried rice on a bed of lightly steamed cabbage?

 

[DGWVI]

You guys are speaking my language!
I love Thai food too. Those curry chicken skewers with that peanut sauce is insane!

My go-to at the local Thai place is Pad See Ew with fried tofu and mushrooms for protein with extra basil, moderately spicy with a Thai coffee

.... And, now I'm hungry


Anyway, back to the circuit- pulled the tantalums, they measured within tolerance, and were oriented correctly, so put those back after also trying some aluminum electrolytics

I was able to remove the sockets for ICs 6 and 7 with no issue- checked the relevant pads for damages and bridges, none to be found. So, got those back in .
I wasn't able to remove the sockets for ICs 5 or 8 without risking damage, but I did examine the relevant pads and traces, and again found no damages or bridges

Rechecked continuity on the switches (without power ) and that all checks out according the the schematic.

Here are updated voltages, with the switches in B mode with Forward sweep -


I still need to do a comprehensive probe and trace for voltage, but that will have to wait until tomorrow night when I have more free time

Here's everywhere continuity and values(including my substitutions) were verified-

 

[Coda]

I like asparagus…

 

[Feral Feline]

I'm eating a Hungarian Salami sandwich (home-made sourdough), butter, double-smoked cheddar with two kinds of mustard (Dijon and a super seedy thing) with thinly sliced Polskie Ogórki ... typing this between taking bites.

Good thread. I hope it's marked "SOLVED" soon and not "SERVED".

 

[DGWVI]

Got a little bit of time to probe some more this morning- had a lifted pad at D1B anode. Seems to be working fine jumpering that trace

I should have some time tomorrow to finish getting this boxed, with a demo / report

 

[benny_profane]

Got a little bit of time to probe some more this morning- had a lifted pad at D1B anode. Seems to be working fine jumpering that trace

I should have some time tomorrow to finish getting this boxed, with a demo / report

Sandwich demo/report or pedal demo/report?

 

[DGWVI]

Sandwich demo/report or pedal demo/report?

I could probably do both. Been snacking on PB & honey sandwiches with my busy schedule lately, and that texture definitely meshes well with the funk this pedal brings.