640CD DOS Compatible no chime

[crazyben]

I have a spare 640CD DOS Compatible board that does not boot or chime when I plug it into my main 640CD machine. The joystick port is missing its cover, so it’s possible someone may have plugged the video cable in there by mistake. I have not recapped it yet. Is recapping the first thing I should do before trying anything else?

I also have a few 630CDs. Can I swap the DOS board from the 640CD into a 630CD, or are they not compatible?

 

[Durosity]

Do you get any video? Recapping is a good place to start, the caps on mine were starting to leak when I did it last year. Have you tried to run it without the PC Card in place?

As for the board, it only works with certain revisions of the 630 board.. it needs to be the model with two SIMM slots for RAM for the Mac itself.

 

[crazyben]

No video. I haven’t tried it without the DOS card yet, but I can give that a try. I’m not sure which model I have. Let me recap and see if that works.

 

[Durosity]

Oh and try changing out the ram on the Mac side too first, could easily be it’s dodgy!

 

[crazyben]

will do.

 

[lem150]

Do you get any video? Recapping is a good place to start, the caps on mine were starting to leak when I did it last year. Have you tried to run it without the PC Card in place?

As for the board, it only works with certain revisions of the 630 board.. it needs to be the model with two SIMM slots for RAM for the Mac itself.

Is the LC 580 logic board able to work with the 630 DOS add on card?

 

[Phipli]

Is the LC 580 logic board able to work with the 630 DOS add on card?

Only the 580 style logic board works with the 630 DOS card.

The card can't be used with a regular 630 board. The two RAM slot 630 board is the same part as the 580 board.

 

[lem150]

Only the 580 style logic board works with the 630 DOS card.

The card can't be used with a regular 630 board. The two RAM slot 630 board is the same part as the 580 board.

So even though its used in the LC 580 and the 580 never had a DOS model, it will work?

 

[Phipli]

So even though its used in the LC 580 and the 580 never had a DOS model, it will work?

It only works with the LC 580 board.