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Hi Dave & welcome :)

1 BZ UR here please :)

Upright is ok, just rev.1 won't work in a cocktail as it can't flip the screen

Change the batteries

I had a CPU that did the exact same thing, bars of rug about 1cm wide across the full screen that just constantly reset, was a ram or 2 in bank 1. I know you say they are all new but as mentioned by DarrenF above, they lie

I have a Defender CPU board that will not sync to any of my monitors, tried 3. t's the horizontal sync that is affected, there is a tiny window where the picture is stable but it jumps repeatedly sideways. Any ideas ? TIA

Now that's funny right there :)

Neutral cure silicone is what you want

Have you tried test mode ? Usually inside coin door on the left. A series of beeps should ensue

Hey Eric Ram error, bank 1 chip 7 which is the 2nd from last chip (top right), either a 4116 or 4164 if converted, replace that chip, error should be gone. As to the 2nd revision set, all you need is someone to burn the eproms and replace them for yours, anyone with the correct programmer can...

Try rotating the brightness pot (RV7) on the chassis, fully in both directions a few times, could be a bad contact on the wiper of the pot. It is a 9110 btw, just an uprated version of the mtc9000, for 25 & 28" tubes

Definite bootleg, Taito liked people to know their boards, Also should have GX-511 screened near centre of board

Must be a day for fixing Star Wars, both myself and a friend had odd and badly placed vector squiggles on two different cockpits, but fixed with replacement AVG's Congrats on yours Andy.

Another plus for restore back to Bagman, great game, many fond memories. Will be watching :)

Revision of original PSU for Joust, Robotron and some of the later Stargates, it comes with a big separate heatsink. Will work the same but has better protection built in.

Check the soldering on the interconnect between boards, had two recently with dry joints, one had that same problem Andy.

I have an original (rebuilt 2007) linear psu in both my Defender and Stargate but also have the add on over voltage board that came with the first run of Stargate's in both, solves the problem, keeps the originality. Both been stable since rebuild 5 years + Andy.

Finding a Defender in the middle of a pile of bricks, in a cafe I used to frequent as a kid, offered the equivalent of $140 and taking it home with me on the back of a truck. This was in 1985, collection is now at 17 and climbing. Andy.

I think the only way around it is to cut the wood away and remake it, its only a bit of chipboard with 2 holes in it.

^^ This :) I had a Kung Fu Master with a direct short on the 12v line, turned out to be a tantalum on the top board.