Author Topic: Space invaders II Tabletop, pinouts  (Read 2485 times)

wintonmartin

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Space invaders II Tabletop, pinouts
« on: July 07, 2010, 05:49:55 PM »
Hi all, so i am really itching to get my space invaders II Table Top machine up and running. The cab is not an original but the board is. Everything seems to be there from what i can tell and is connected. I have got the pin outs list and tested. When it is switched on there is a constant ship sound and there is lines accross the screen but nothing else.

First I tested the transformer on the A/C side - OK. On the D/C side 2 x 50v, should be 100v, but i'm guessing that it is split. Can anyone confirm?

I checked the voltages on both boards, all grounds checked to be OK. All voltages checked OK apart from 3, which are:-

Top Board - Pin H - 0v (should be  18v) What is this related too?

Bottom board - Pin E + Pin 5 - 8v (should be 5v(is this OK?)

Also i noticed the green wire coming from the reset button inside has been cut, there is a little trickle and when it is pressed it drops to 0v. where should this be connected?

Is there anywhere else inside the machine i can test?




Any help would be appreciated

Thank you