Help on a 128k

[aurel6814]

Hi,

I'm new on this forum. I'm also french and hope you will understand my english.

I've read a lot of topics here and I think I'm in the good place to tell you about my problem!

I've found a Mac 128k upgraded to a 512k but it doesn't work.

Here's some pictures :

https://lh6.googleusercontent.com/_UAbxSXFQB0s/TcaNxFGfNlI/AAAAAAAAASk/gbX6GB2HuAQ/s800/Sad1.JPG

https://lh4.googleusercontent.com/-Ed1SV0k7Ajo/TcaNxOApj9I/AAAAAAAAASg/fdlARnykGkI/s800/Upgrade%252520512k.JPG

Some lines are missing on the error code, and the small lines - dashes under the code move.

It makes a sound at start up so I suppose the CPU is ok.

I've tried to :

-exchange the ROMs with a 512k, ROMs are fine.

-change the RAM, (take away from a working PC 5150 motherboard)

-Use 2 different power units.

-jump the motherboard to put it on 128k (I've found the tip here),

-clean the motherboard.

But I still have the same 020400 error which tells me that the G7 RAM chip is not ok.

I know the motherboard was working a while ago and stoped working progressively (after 2 or 3 start up).

I suspect a bad capacitor but not sure at all.

I'd like to have your opinion before take the soldering station out!!

Thanks for your help.

 

[Mordecai3855]

Hi I recently posted what I believe is the same problem maybe a little more pronounced.

I'm sad to see nobody has been able to help so far.

If I find any solutions I'll be sure to let you know.

By the way I'm French too.

Here is what I posted:

Heeeeelp!!!!!! Strange black lines partially blocking sadmac!!!!When I first got it, there was a sadmac with the error code 048545

I then proceeded to remove the ram chips and installed ic sockets.

I must have messed something else up because after replacing all the ram chips

This is the screen that appeared:




I've checked the continuity between all the ram chips. All my solder joints are good

I then changed the ROM chips with known functioning ones. Still no luck

Anyone have any suggestions????

Thanks...

 

[Apostrophe]

Salut et soyez les bienvenus, tous les deux! Moi aussi je suis Francais, ou plutot, moitie Francais, moitie Americain. Ca fait plusieurs annees que je visite la France, donc pardonnez mon Francais si ce n'est pas tout a fait...naturel, quoi.

J'ai un Mac SE qui avait un probleme similaire avec le Sad Mac...j'ai ramplace le RAM et le probleme est disparu. Et vous savez,--et je ne plaisante pas-- il y a des histoire de success des gens qui mettent l'ordi entier dans la vaisselle, puis les laisser secher pendant une semaine. Il parait que c'est une tres bonne methode pour vraiment les nettoyer, ces ordis. Donc j'espere bien que c'est aussi simple pour vous.

Bon courage.

-Apostrophe

 

[Apostrophe]

And sorry for you non-French speakers. )

Just run what I said through Google Translator. It's gonna come out looking strange, but at least you'll understand. I don't get many opportunities to practice my French, you know.

-Apostrophe

 

[techknight]

I see your in ohio, where at? if your close by I might be able to help.

 

[Apostrophe]

Ummm, no, I think you're misunderstanding me, Techknight.

I was just telling them about the famous "dishwasher cleaning" method, I myself don't actually need assistance.

 

[techknight]

oh Im sorry, wrong nick. hehe. That, and the french stuff threw me off.

 

[superpantoufle]

Once again sorry for the non-french speakers…

Ok, c'est quand qu'on demande à ouvrir une section francophone sur 68kmla? Il y a de quoi faire!

Par contre je n'ai malheureusement aucun idée pour faire avancer le schmilblick avec ton 128K. Mais le nettoyage de la carte mère que propose Apostrophe ne peut pas faire de mal. S'il s'agit d'un condensateur qui fuit, le nettoyage permettra a priori de résoudre le problème temporairement, et tu sauras que tu peux faire chauffer le fer-à-souder pour "recapper" (what's the french for recapping?) ta carte-mère.

Sadly I've no idea how to solve this 128K's problems, but to clean the board won't harm, and may help focussing on a capacitor issue.

 

[Apostrophe]

Voila. Et la seule chose, si vous voulez mettre l'ordi dans le lave-vaisselle, il faut d'abord enlever le floppy ...ahh, quelle est le mot Francais pour floppy drive...bon, enfin, enlevez le floppy drive. Car l'eau le detruira bien. Et enlevez aussi le RAM, comme ca les contacts entre le RAM et l'ordi seront nettoyées aussi. Donc, pas de floppy drive, pas de RAM, et pas de hard drive, tres important. Et quand vous le mettez dans le lave-vaisselle, essayez un mode un peu plus doux que d'habitude.

Et superpantoufle a raison! Pourquoi pas ouvrir une section Francaise ici?

-Apostrophe

 

[aurel6814]

Thanks for your answers.

I'm really not sure about puting my (precious ) mac in a dishwasher!!! !!

I"ll try to change the capa and then we'll see!

There' actually lot's of French site about retrocomputing! I'm on this one : http://forum.system-cfg.com/index.php. You're welcome.

But there's no site just about 68k macintosh!