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| Installing FPU and removing drive on Classic II: Do I need to discharge CRT after opening case? |
Posted by: foxtrot81 on 2023-10-04 17:26:42
Do I need to discharge the CRT if I will only be installing a FPU and removing the SCSI hard drive or is It safe?
I can leave the Mac off for 2-3 days if needed.. |
Posted by: Phipli on 2023-10-04 17:36:44
Do I need to discharge the CRT if I will only be installing a FPU and removing the SCSI hard drive or is It safe?
I can leave the Mac off for 2-3 days if needed.. You'll be fine if you keep away from the tube and the analogue board. Just take care.
Don't lick any big capacitors either. |
Posted by: bigmessowires on 2023-10-04 18:08:28
I'm a chicken, so I use the "keep Mac turned off for a few days" method. |
Posted by: superjer2000 on 2023-10-04 20:13:19
I discharge the CRT whenever replacing analog boards etc but not once have I ever heard a discharge. I understand it’s just a fail safe in case the bleeder resistor fails (or you’re working on a really old ab without one)
Also I have a capacitor discharger and I’ve never a residual charge on any of the caps on a Mac analog board (that I can remember).
As recommended earlier, when doing upgrades etc I just don’t touch the crt out of caution but I think any risk even if you did touch it (when the machine is off) is very low. |
Posted by: Phipli on 2023-10-05 00:13:03
Note I'm only saying don't discharge it because the components they said they are working on can be removed without getting too close to the high voltages. It's not worth taking risks, and only poke at such things when somebody else is about to take you to hospital if something terrible happens. |
Posted by: joshc on 2023-10-05 00:16:56
I'm of the opinion that you are exposing yourself to more danger by discharging when you don't need to. Don't touch the CRT or anything on the analog board, just remove the hard drive / logicboard.
Also keeping it off for a few days beforehand to be extra sure is not a bad idea either. |
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