Emax

Hi,

It is a rack.

Mobo EMAX CPU PCB PC333 BOARD REV A

Seems like it is possible to get the CMOS chips still http://parts.digikey.com/1/parts/515947-ic-octal-d-type-f-f-hs-20-dip-cd74hct273e.html

Will reply regarding your services off list.

Many thanks!



--- In emax@yahoogroups.com, "jack" <jammie.emma@...> wrote:
>
> the cmos logic chips deal with the leds switching and all button presses
> 
> the scanner cpu is usually for keyboards is it a rack or keyboard
> 
> now i have spare mother boards what rev is yours
>   ----- Original Message ----- 
>   From: mcnik_k 
>   To: emax@yahoogroups.com 
>   Sent: Friday, November 04, 2011 8:09 AM
>   Subject: [emax] Most front panel buttons don't work - Emax 1 Rack HD
> 
> 
>     
>   Hi all,
> 
>   I managed to get an Emax, but unfortunately there is a fault. Most of the front panel buttons are not working, and the ones that do are not doing the correct function. From the numbers and arrows, only 7, 9, and 0 seem to work, and 7 and 9 seem to do the sideways arrows function sometimes. 
> 
>   Machine can load discs, and can playback sequences, but the only 'Modules' switch that is working is 'preset management', and that brings up the 'master' menu!
> 
>   LCD and sliders work OK.
> 
>   I have checked panel board and looks ok, also all switches work ok and have tested lead to mainboard and all connections are ok.
> 
>   Have read this could be the 'scanner MPU', but cannot see a chip called "6500/11" nor "IM-386 R1125" nor "6502 Rockwell". Does anyone know where this chip is located? In any case, I have heard this can't be replaced these days, but I'm thinking maybe it is another chip that has gone such as a CD74HCT273E CMOS Logic Octal D-Type Flip-Flop (not sure what these do, but they seem to look directly at the ribbon cable coming from the display).
> 
>   Any help would be much appreciated. I am ok with a soldering iron and have multimeter + oscilloscope so can run any checks anyone thinks are appropriate. Failing that, if there is anyone in the UK that fixes these old birds, please let me know!
> 
>   Thanks,
> 
>   Nik
> 
> 
> 
>   
> 
> [Non-text portions of this message have been removed]
>