Question: what kit should I be ordering (when it comes back in stock) for the ribbon cables?

I have a repair customer, and have been looking at GPE and others, but not sure what set I need to be ordering.

Thanks!

I think that's what I need - talking about the ribbon cables, especially from the fliptronics, mpu, audio board. Thanks! I hardly ever check Marcos these days

I could print this for people if it's needed. Not sure what postage would be but time and materials should be about $1-$3 max using PLA depending on infill.

Ok.

So I removed J209 from the MPU, the ground shorts do not show.

When the 10 switch opto board (which I reworked and replaced the LM339s with sockets) is installed, power shows on the board, and in test mode, I show three rows with 'ground short'. Row 3 (White/Orange), Row 5 (White/Green), Row 7 (White/Violet).

When J3 is disconnected from the 10 switch opto, switch test shows those rows normal.

I've disconnected the trough opto board, but did not seem to affect the rows out.

Tracing J3-10 (the White/Orange wire, aka row 3), I show that there is no direct short to J3-1 (ground), and I show continuity to non-banded D3 diode and non-banded D12 diode as I would expect.

Because I show the entire row, and three of them, I am beginning to suspect something wrong with the LM339s as there are three. Don't have any good basis for this belief as I am lost here.

I don't show any short to ground or any continuity on U1 (LM339 # 1) from the white/orange wire.

I haven't tried to disconnect pin 5 (E2 Opto 3) from J2 to see if that's the possible short.

Looking for some insight, thanks in advance.