[Namy]

Hi!

So, relatively new DIYer. I have just built my first LA502! Yay!

In testing, the v+ rail looks great (+15.7v)

Second test of the v- rail returns… .787 mv.

I have checked all polarized pieces (caps, diodes, etc), and they’re fine. I’ve looked for bad solder joints across the board, and particularly between pins 13, 14, 5, —> OV / V-, but I don’t see anything of concern. I also double checked connectivity and resistance on those joints, and everything checks out.

I’m sure it’s something silly, but I’m still learning how to fully understand the schematics and I’m not sure where to turn my attention. Any help would be appreciated!


(PS: I am using an XT500 with an API Lunchbox 6B. The XT500 seems to fully check out, though there might be something I missed)

[JPK]

- Remove all the socketed IC's and and check it it is still the same.
- Check the value of R39 with the ohmmeter (1 ohm). It should almost look like a short.
- Did you need to remove a component during the build?