Zpsdx v2

[ggarms]

Hey Guys,

Been a bit since my last post.... but reaching out for some assistance. I've had the zpsdx 2 board in my drawer for a while, and recently made myself order the needed pots. After building up, all voltages on all IC's are ok except on the pt's. I am getting 5v at the out of the regulator, however at c58 I am not reading 5v, usually only half a volt.  I've checked all the components on that trace and can't find anything obvious, and gone over the entire board a few times to check for cold joints, orientation etc. my issue appears to be  in this general area, but I am stuck. for testing, I have s1 and 2 jumpered. Any thoughts? (edit: picture to come, I have to scale down the photo quality)

[madbean]

Little confused...there is no C58 on the ZPDX2. Not the production one. Is your board black or green?

[ggarms]

I have the black pcb. As a side note (and I have never had this issue before with MB boards) I noticed when soldering this up I continuously had issues with the solder fizzing and popping, no matter what the temperature setting. I've used the same kester on different boards with no issues; I just couldnt get the stuff to tack right! Maybe because it was sitting for a long time?? I dont know.....

[ggarms]

 And on this side, I am aware there's some components missing. I took this when troubleshooting caps (:

[madbean]

Where is the C58 on your pic you uploaded?

[ggarms]

Right below IC2 to the right of the regulator

[ggarms]

On the solder side photo it was taken when I had removed a few caps for troubleshooting. the Top side photo has it installed.

[ggarms]

I think I ordered mine with the first run. Is there anything pcb/fix wise I should be looking for or is this more likely something like a short/bad joint somewhere? My voltages are on the money everywhere else except where I mentioned (pt 5v section)

[ggarms]

Any ideas from anyone? This ones got me!

[jimilee]

There are only 2 fixes on the proto and neither of them have to do with that cap.


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[jimilee]

There is either a short to ground, or a missing trace between the regulator and c58. The path goes through c58 and pin 1 of the pt2399 above it. You should have voltages on c44 and c48, they’re all connected. Checking for continuity would be the easiest way to test, for me anyway.


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