erikthecat
User
- Credits
- 21CR
[ukvac] TECH: Konami style clone -5v question....
> good afternoon?
>
> i have an Scramble CLONE pcb running via a 'Konami class' finger board,
> powered by a 'prime-power' 104W PSU(swallow electronics supply).
> the board was a known worker on the sellers machine. all other boards play
> ok on the tabletop. other Konami (Sega Frogger) style boards play OK, via
> the same finger board.
>
> i adjusted the +5v to the correct level, the game plays OK for a while,
but
> then displays misc. sprites all over the screen. after a reset / reboot,
the
> game plays OK for a while, but then repeats the same effect.
> all the connectors are clean and i/c fully seated.
>
> i decided to check the other voltages,
> +5v terminal reads 5.00v
> -5v terminal reads -4.83v
>
> is this OK. or could this be causing a problem?
>
> i suppose the question is, what does the -5v supply / do?
>
> as this is a CLONE pcb does that require a slightly higher +5 voltage?
> (i'm sure i read that somewhere on a supergun website!)
> should i adjust the +5 level;, so that the difference between +5 level
> and -5 level is equal?
> (i.e, say 5.1 and 4.9 respectively)
>
> or am i just typing b*****ks?
>
> your help would be appreciated.
>
> thank you.
>
> GaRy
>
> good afternoon?
>
> i have an Scramble CLONE pcb running via a 'Konami class' finger board,
> powered by a 'prime-power' 104W PSU(swallow electronics supply).
> the board was a known worker on the sellers machine. all other boards play
> ok on the tabletop. other Konami (Sega Frogger) style boards play OK, via
> the same finger board.
>
> i adjusted the +5v to the correct level, the game plays OK for a while,
but
> then displays misc. sprites all over the screen. after a reset / reboot,
the
> game plays OK for a while, but then repeats the same effect.
> all the connectors are clean and i/c fully seated.
>
> i decided to check the other voltages,
> +5v terminal reads 5.00v
> -5v terminal reads -4.83v
>
> is this OK. or could this be causing a problem?
>
> i suppose the question is, what does the -5v supply / do?
>
> as this is a CLONE pcb does that require a slightly higher +5 voltage?
> (i'm sure i read that somewhere on a supergun website!)
> should i adjust the +5 level;, so that the difference between +5 level
> and -5 level is equal?
> (i.e, say 5.1 and 4.9 respectively)
>
> or am i just typing b*****ks?
>
> your help would be appreciated.
>
> thank you.
>
> GaRy
>
