Does anyone have a line on schematics for Stern Spike boards 520-8029-00A or 520-7034-00A? I'm helping a friend with an SWP that has 3 failed LED boards connected to the lower node board. I want to take a crack at fixing these boards rather than purchasing replacements.

Thanks!

Thanks. I looked through those yesterday but could not find these specific boards.

The closest match is 520-6831-00 which is a 16 LED driver board. I'm guessing the basics of the watchdog and shift register are same, but these boards are 8 LED boards that use a different shift register and also include some circuitry around an LM339 that I think is used to fade the LEDs. There are a couple of components that I can't make out the markings for.

Here are pictures of the two boards. The 7034 board lights up the FORCE drop target inserts.

I put a contact request into Stern.

Thanks.

IMG_20190810_143248 (resized).jpg

IMG_20190810_143336 (resized).jpg

FYI Only....

I contacted Stern but they do not have schematics available for these boards.

This project has gone from helping a friend to full blown quest that defies practicality....

Assuming the shift register, watchdog and serial data out wiring are similar to the 16 LED board (520-6831-00B) that stern does supply a schematic for, I've built a test rig using a Raspberry Pi to simulate the serial data into the board and an old logic analyzer to check the data signals out of the board.

What I discovered is the 7043 board appears to be working perfectly! I guess it was pulled because one of the 8029 boards in front of it was bad.

However, all three 8029 boards appear to have a bad Schmidt Trigger that sends a signal to the serial out header. I can trace the data signal into this chip but not out of it.

I'm about 30 hour into this now and I have to decide if I really want to try to solder a surface mount chip that 2mm long.

Thanks for the idea and the info on lead free vs leaded solder.