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Non-working HV cage/board.

Working HV cage/board.

I swapped the voltage doubler from the working cage to the non-worker, made no difference (and the working cage is still working). Atari's The Book and the BW FAQ points to either open Q900, Q902, Q903, R906 or T900 when base of Q900 measures 25V. All of those, except T900, have been swapped...

Have 2 x G05-801. One is working and one has no HV. The non-worker has a slightly different HV PCB layout compared to the working one. The working HV (and the rest of the boards of the monitor) seems to compare to "issue 1" of the manual and maybe versions above that. C902 on the working board...

Bump.

@mecha Yes, ATARI released fixes for both Road Runner and RoadBlasters if you have the older TTL mainboards. As far as I know, if you have the LSI mainboard you're compatible with all games and all versions of the cartridges (yes, there are TTL and LSI cartridges as well).

Have the stainless steel coindoor and need the frame to go with it to restore a Williams Defender cabinet. LMK if you have it - thanks! (CONUS shipping)

Then you have the old revision of mainboard (TTL (not LSI)) so then probably the bulletin I attached applies to your setup and that is the problem.

I was just assuming that this was a working setup previously but if it's unknown if it has been working then ATARI released several bulletins on how to modify the older revisions of the mainboard to cover later released games like Road Runner and RoadBlasters. If the mainboard is of a LSI (not...

I would do what @mecha recommends but I would also measure the voltage(s) on the mainboard and the cartridge (but make sure you don't "fiddle" with the probes since it's a narrow compartment inside the System I cabinet and quite hard/difficult to reach and see what you're doing). But check the...

ATARI System I has line audio output (separate amplifier is required for sound (for example the Audio Regulator III which provides power as well)). If you want to hook up a System I mainboard + System I cartridge on the bench then you can use +12V instead. Same with the negative voltage, use...

A bit hard to see all the connectors and if the right one is there for the G05 801. Worst case I need to make an adapter I guess (need to source the correct connector). From searching I found this to be likely (part number may be an internal distributor number): 150179-2060 - Housing...

Great information @andrewb - thanks a lot! The connector (J8) on my AR is a 4 pin connector so that's fine I guess. If I was to make my own harness what type of connectors/pins are involved (to make the essential at least (power and X-Y signals))? I understand that I need an edge connector for...

Asteroids is the game board I want to use for testing (known working board).

Would like to test a couple of Electrohome G05 801 monitors and would need a harness for this. Have a B/W powerbrick (marked A006555 on the underside of the brick (diode PCB)). and an Audio Regulator PCB (marked A034485) which I hope is the right parts if anybody know/can confirm? Thanks!

Or study your chassis, make notes and order the parts from a local company? G07-CB0 is a well known chassis and there is probably lists available if you search for it (but you chassis needs to be removed anyway).

What arcade game, and WHY? Marble Madness. So many things was a first with that game and the System I hardware. Also to be able to work with Mark Cerny and the rest of the MM team @ ATARI Games. What would you have added? Definately more levels and code optimization so it could cope better...

He means the utility panel inside the coin door for testmode, volume etc.

Since the fault is mentioned in the Paperboy manual it's probably not totally uncommon at least. The manual says; "If the 6502 circuitry fails to reset through all ten attempts, a communications error message will be displayed" and that message is "6502 processor test / communications failed ...

Very cool project and congrats for designing this. A 42 pin ZIF socket would have been good though.