I managed to get hold of a Space Invaders arcade game board set.
(80-900K)

A little bit rough though…
Many chip legs has rust on them, and someone once spilled a bit cement or something similar on the board.

Bad sockets for the ROMs and CPU, so i will replace them.
I will also have to remove most of the chips and put in sockets together with new chips.
All RAMs and the CPU socket are now desoldered.
5 RAMs lost their legs during desoldering due to rust…

Next : ROM sockets, tantalums, capacitors and rusted ICs…

Big project this one.. 🙂

I got this Space Invaders arcade game in for repair.

I made no promises because this is my first arcade game in a cabinet, and i have never worked with arcade monitors and power supplys.
Also Space Invaders CPU is an Intel 8080, which are somewhat hard to come by.
Not to mention the RAMs that are almost unobtainium (For me anyway), and appearantly often goes bad on these.
This will take some time.. 🙂

Measured voltages, and they were ok.
I then hooked up my monitor (Philips CM-8833-II) to the game instead of the monitor that is in the cabinet, and powered it on.
Garbage appeared on the screen, so the game is not booting.

The power supply i have on my workbench should deliver -5v, but when measured it only showed -4.2v, and i am not sure if that would hurt the 8080.
The 8080 is appearantly sensitive to the -5v supply, if it is missing, the 8080 are likely to be destroyed.
I will not risc that, så i will first have to find a solution for a power supply that delivers closer to -5v before plugging it in on my workbench and start troubleshooting.