Cleaning core memory?

[hharte]

Hi,

Does anyone have experience with removing dust from core memory stacks? I recently acquired an 11/35 (the BA11-FC 21" chassis) and it is loaded with dust. I cleaned the H742 power supply thoroughlt with compressed air and some Windex (for the plexiglass covers and the enclosure.)

I imagine that I can clean the rest of the chassis in a similar manner, but I am worried about the compressed air messing up the core stacks. I suppose I could regulate the pressure down to about 15-20PSI. I've also heard that static electricity can be a problem when using compressed air, but I haven't drained the water from the compressor tank in a while, so I think there should be sufficient humidity in the air to help dissipate the static charge.

Also, I don't really want to remove the covers from the core memory, as that will void the warranty. (just kidding, I just don't want to ruin the "warrany void if removed" stickers.)

Thanks,
Howard

 

[Erik]

Does the memory work as-is? If you are removing the dust for purely cosmetic reasons, I'd say to leave well enough alone.

If you have to remove the dust to restore the functionality (or if the stack is just for show) then you might be better off with something other then just compressed air.

I have a few planes of core for display purposes and, from appearances, they aren't THAT fragile. I'd say a very soft, static-free brush to loosen the dirt (if you can reach) and your low-pressure air should do the trick.

Keep in mind that I don't meet your criteria of a person "experienced" in cleaning cores, so. . .

Good luck!

Erik

 

[FrankThemann]

dusty core memory stack

dusty core memory stack

Hi,

I have worked with core memory quite a while. Since the stacks I used were well protected against any dust, I never had to clean them, but everything else in electronic circuits, I cleaned with compressed air (at minimum possible pressure...). The core stack itself is not ESD sensitive, but the driver electronics is. If you can handle just the stack, it should not be a problem. Any other cleaning method, such as ultrasonic cleaning with a cleaning solution, is probably not possible, since the stack would not dry from inside. If the driver electronic is included, try to short all contacts and wear an ESD protection wristband connected to ground with a proper resistor when handling the stuff. Never use compressed air with lubricant (oil) - this would only be good to drive machines.

Have fun - Frank