Bad contact in the expansion port...

[SyX]

At last i have get a decent work table to put simultaneously the PC & CPC and ... Murphy is my hero

I have installed my 6128 with CRTC 4, the one that i was using mainly with the MegaFlash, and when i switch on with the MegaFlash, i get crashes of every colour and demo fxs  without the MegaFlash the CPC goes perfectly. Lucky me, i have another 6128 (with CRTC 2... ugh ) and it goes perfectly with the MegaFlash. It's strange because i was using the CRTC 4 the last friday when i tested the Bomb Jack roms and today, nothing.

And i don't see anything odd in the expansion port... well, i suppose that i will must to clean the contacts (and before today i was lucky) ...

What it's the best method to clean them, ¿alcohol? ¿rubber?... or anybody think that i would must test other things before???

[TFM]

I always used cotton tips with 200 proof alcohol. *Hicks*

[Joseman]

Hi Syx

I readed sometime ago that the best for this purpose is the use of  "alcohol isopropilico"

Personally i don't have experience with this alcohol cause i use contact cleaner bought on an electronic shop...

but if you read on internet you'll see a lot of people that cleans electronic circuits with this...

Regards
Joseman

[SyX]

Thank you both!!!

I will test tomorrow and tell you how goes

[Badstarr]

A decent pencil eraser/rubber whatever you like to call it usually does the job for me, on my 6128 or when I install old PCI and RAM cards in my Powermac G5, which is infamous for not throwing a fit if the contacts are less than perfect!


Just use a fairly firm pencil eraser not an abrasive/gritty one, gently rub each contact in turn until all the black residue/oxidisation is removed and you have nice shiny contacts. Remember to do both sides, top and bottom. I assume your machine has edge connectors?


Isopropyl Alcohol is very good too but usually best after cleaning with a rubber, the alcohol has good anti static properties too, that's why I use it on my Vinyl records. This can only be a good thing for electronics, I use it on my GT65 monitor screen it keeps the dust from sticking so much!   

[SyX]

Thanks Badstarr!!! 

[TFM]

Good luck !!! 

[Gryzor]

Isopropyl alcohol is a secondary alcohol relative to propanol. My dad used to bring me gallons of it when he was working as a chemist to clean different things. That said, it's not really better than pure alcohol, merely a LOT cheaper, and that's why it's used.

[SyX]

I have applied all your wise advices and i can confirm that in this moment my CRTC 4 is officially fine and running with the MegaFlash attached

Thanks boys!!! You are Great!!! 

[xesrjb]

Isopropyl alcohol is a secondary alcohol relative to propanol. My dad used to bring me gallons of it when he was working as a chemist to clean different things. That said, it's not really better than pure alcohol, merely a LOT cheaper, and that's why it's used.

So, now I'm drunken and the PCB is still dirty!

xesrjb

[TFM]

So, now I'm drunken and the PCB is still dirty!

xesrjb

Because you picked the wrong bottle, not Ethanol! Take 2-Isopropanol! (Which is not cheaper then Ethanol in USA).