Sproing Deluxe - No Power to 4558?

[Wizardofwoz66]

Any chance we can get a schematic for The Sproing Deluxe? I have no power to my 4558 and therefore no LFO at all. Hoping to get the schematic with the correct component numbers (the Moonshot is the schematic but with different component numbers it makes it much harder to chase down the issue). Reverb works fine and the other trem ICs have reasonable values (9V, 4.5V , or 0 V at the appropriate pins), I've build ~200+ pedals at this point and I'm at a loss here. No obvious shorts that I can find. Tracing this back with the schematic will be quick but without it it's a pain lol.

 

[Wizardofwoz66]

For some reason it looks like the pictures didn't upload, trying here

 

[Wizardofwoz66]

For some reason it looks like the pictures didn't upload, trying here

 

[Feral Feline]

You just need to copy the URL from the other thread and post the pic-link here.

Like this:

EDIT:
Weird, there were no full-sized pics in the OP a moment ago... forum glitch or my computer glitching? I just got the dagnabbed thing fixed, but maybe it was spayed or neutered...

 

[Feral Feline]

Hmm I think I see the problem ... several film caps are mounted upside-down/backwards ...


Seriously though, you say you've got zero power to the 4558, have you tried another 4558?
I know you said no obvious shorts, but now look for the less-than-obvious — remove the 4558 socket and have a peek underneath it.
Trace the power path to the 4558, I know a correct resdef schematic would help and yes it is "harder to chase down the issue"..., but with the Moonshot and your DMM set to continuity, you should have enough to work out the power-path here.

I'd start by taking the Moonshot schematic and trace the PCB and relabel the refdes on that schematic.

Compare to some other forum member's build. Here's ErikS' build's gutshot:














At any rate, looking at the Moonshot schematic, it shows in the power section a 100Ω resistor leading to pin 8 of the 4558.
A 100Ω resistor should be brown black black black brown, and I can't tell what you have there, colours are dim.
Could be brown black black purple brown = 1GΩ (unlikely);
so might be brown black black red brown = 10k;
unless that band is scratched off or something, whatever it is, it is NOT brown black black black brown at R103, just right of 4558's pin 8.

If it is NOT 100Ω, then that could explain why you've got "no" power to your 4558.

Need more light on the PCB to see what the colours are, as per ErikS's.




Unrelated to power, maybe touch up the solder on the C100k pot?

 

[Robert]

https://docs.pedalpcb.com/project/Schematic-SproingDeluxe.pdf

 

[Wizardofwoz66]

For some reason it looks like the pictures didn't upload, trying here

Hmm I think I see the problem ... several film caps are mounted upside-down/backwards ...


Seriously though, you say you've got zero power to the 4558, have you tried another 4558?
I know you said no obvious shorts, but now look for the less-than-obvious — remove the 4558 socket and have a peek underneath it.
Trace the power path to the 4558, I know a correct resdef schematic would help and yes it is "harder to chase down the issue"..., but with the Moonshot and your DMM set to continuity, you should have enough to work out the power-path here.

I'd start by taking the Moonshot schematic and trace the PCB and relabel the refdes on that schematic.

View attachment 87680

Compare to some other forum member's build. Here's ErikS' build's gutshot:

View attachment 87681












At any rate, looking at the Moonshot schematic, it shows in the power section a 100Ω resistor leading to pin 8 of the 4558.
A 100Ω resistor should be brown black black black brown, and I can't tell what you have there, colours are dim.
Could be brown black black purple brown = 1GΩ (unlikely);
so might be brown black black red brown = 10k;
unless that band is scratched off or something, whatever it is, it is NOT brown black black black brown at R103, just right of 4558's pin 8.

If it is NOT 100Ω, then that could explain why you've got "no" power to your 4558.

Need more light on the PCB to see what the colours are, as per ErikS's.

Unrelated to power, maybe touch up the solder on the C100k pot?

That should have been the first thing I checked. At some point I had a bunch of 100ks get into my 100R bin. I'm going to confirm when I get home but I almost guarantee that's the issue

 

[Wizardofwoz66]

Hmm I think I see the problem ... several film caps are mounted upside-down/backwards ...


Seriously though, you say you've got zero power to the 4558, have you tried another 4558?
I know you said no obvious shorts, but now look for the less-than-obvious — remove the 4558 socket and have a peek underneath it.
Trace the power path to the 4558, I know a correct resdef schematic would help and yes it is "harder to chase down the issue"..., but with the Moonshot and your DMM set to continuity, you should have enough to work out the power-path here.

I'd start by taking the Moonshot schematic and trace the PCB and relabel the refdes on that schematic.

View attachment 87680

Compare to some other forum member's build. Here's ErikS' build's gutshot:

View attachment 87681












At any rate, looking at the Moonshot schematic, it shows in the power section a 100Ω resistor leading to pin 8 of the 4558.
A 100Ω resistor should be brown black black black brown, and I can't tell what you have there, colours are dim.
Could be brown black black purple brown = 1GΩ (unlikely);
so might be brown black black red brown = 10k;
unless that band is scratched off or something, whatever it is, it is NOT brown black black black brown at R103, just right of 4558's pin 8.

If it is NOT 100Ω, then that could explain why you've got "no" power to your 4558.

Need more light on the PCB to see what the colours are, as per ErikS's.

Unrelated to power, maybe touch up the solder on the C100k pot?

This was indeed the issue lol 100k in place of the 100R. The solder at that pot is fine, just bad lighting. Thanks for the help!

 

[Wizardofwoz66]

https://docs.pedalpcb.com/project/Schematic-SproingDeluxe.pdf

Thanks Robert!