Tech help advice needed

[netdent]

i guys,

I have bought a faulty moon alien tabletop of ebay recently, cant find a decent manual scan that i can read, it has 2 fuses mounted near the bridge rectifier a 2 amp and a 10 amp, it instantly blows the 2 amp but from what i can make out this is for the 100volt service outlet! the monitor i think is running tube heaters lit raster noise on power up but if i turn the screen voltage up no blanc raster, not sure if it wont display if no video signal fom game board. It has a complicated power supply compared to the moon cresta i restored before seems to have a wide variety of voltages 12v, 16v 5volt -5volt etc, not sure if i have multiple faults here or not, game wont coin up with sound anyway, the machine has not been touched by anyone else it would seem, im scratching my head now not sure where to start, the power supply has 2 bridge rectifiers one seem to be for audio its transistor is running very hot along with its resistors i assume the rest of the components are for
running the 5volt logic, as i said the schematics i have are unreadable.

look forward to any input guys

cheers

Ronnie

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[andrewhannay]

ave you measured any voltages?
Have you check for obvious shorts anywhere?
Is the game board still attached?
Just a few to get you going.
Andrew

 

[netdent]

i Andrew, checked the bridge rectifiers for shorts, but i mainly went straight to the monitor chassis as i thought it was dead until i stripped the tube and board out then powered it to find heaters lit but no screen lit even when turned up, im not sure what the bridge rectifier on the base of the cabinet is for as it has 2 also on the power board.

thanks

Ronnie

Andrew Hannay <andrew.hannay@candc.co.uk> wrote:
Have you measured any voltages?
Have you check for obvious shorts anywhere?
Is the game board still attached?
Just a few to get you going.
Andrew

 

[andrewhannay]

s it definately a Bridge rectifier on the base and not a mains filter?
BTW where is everybody?
Andrew

>

 

[netdent]

i Andrew its deffo a rectifier thats filtered to the large capacitor like the moon cresta has.

cheers

Ronnie

Andrew Hannay <andrew.hannay@candc.co.uk> wrote:
Is it definately a Bridge rectifier on the base and not a mains filter?
BTW where is everybody?
Andrew

>