Quoted from Turtle:
What are you trying to achieve by doing this?

Get it clean?

I definitely would not put those boards in a dishwasher. Those boards were never designed for that kind of stress. Plus they are now 30+ years old. Get a can of electronics cleaner and spray it down. If you don't want to do that, then buy a spray bottle and isopropyl alcohol. Or just pour iso alcohol over the board.

I've done it to several other boards with no problem. It's just water and detergent. The key is to remove the board before the drying cycle.

#5 4 years ago

AKB

Andy_B

Pinside member

Worksop

11y 50,550 516 3

Quoted from uncivil_engineer:
The LED should be OK. About the only other component I would worry about would be the flipper relay, and possibly the crystal.

Yeah, always wondered how well sealed the crystal is but never had an issue with it when I have done this previously. No flipper relay on Sys 7 board though.

#12 4 years ago

AKB

Andy_B

Pinside member

Worksop

11y 50,550 516 3

Quoted from G-P-E:
LED's and crystals are sealed.
Switches and relays are not sealed.
System 7 -- CPU board has DIP switches. These are not sealed and over time will often develop a nice blue-green corrosion on the contacts. As long as a switch stays open or closed - no problem. If you change from open to closed with the corrosion, they don't always register as 'closed'.

Thanks Ed.

No DIP switches on this one though.

20190619_194538 (resized).jpg

It does appear to have been jumpered for 2732 chips at IC14, IC17 and IC20. Is this common?

20190619_200043 (resized).jpg

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