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| Plus/512/128 AB brightness potentiometer replacement? |
Posted by: cheesestraws on 2021-01-22 03:59:00
I have a spare AB here that has a broken potentiometer; it's obviously been dropped on that corner at some stage and there's a physical crack through it. I can see it's 1MΩ and it looks like linear, but does anyone know what power rating it is? And, indeed, does anyone know of a suitable replacement before I start measuring things?
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Posted by: apm on 2021-01-27 11:59:16
At 1MΩ there won't be any significant power flowing through the pot. On the SE/30 at least, the voltage that drives the brightness circuit is measured at 106V (according to BOMARC). If the whole voltage was applied across the pot you'd have about 10mW of power, but as the circuit is designed, the pot doesn't even see all of that. So just look for something with the right shaft and pin spacing.
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Posted by: cheesestraws on 2021-01-27 21:48:00
Excellent, thankyou. I thought that might be the case but I have a standing rule to get a second opinion on any repair I attempt at > 24V 😉 .
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Posted by: nkeck72 on 2021-01-28 10:46:38
Excellent, thankyou. I thought that might be the case but I have a standing rule to get a second opinion on any repair I attempt at > 24V 😉 .
That's an excellent rule to follow. Don't want to see full B+ by mistake bw🙂
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