Hi John !
>>>
Am 07.12.2011 15:29, schrieb John Henson:
Hi Pewe,
I am in the middle of a Mini-D restore right now.
Ha,- I hope it´s fun !
Now, after reading everything in your blog, I wonder if you´ll come up w/ a report of this restoration too.
My Mini plays fine, I´m 1st owner and it´s my last one out of 3 I owned, but it needs some work near future not to lose it´s functionality.
I don't stock the wafers, I believe RS components carry an equivalent switch but they are shockingly expensive.
Well, I didn´t expect ´em to be cheap at all ... at least not a complete switch.
The switch contacts are silver plated and thus tarnish over time.
They can be cleaned with silver polish and cotton buds, but it is fiddly and time consuming.
De-Oxit can be very helpful if only a few contacts are iffy
Isopropanol can also help, or some combination of all 3 options.
Thx for advice, I didn´t know they can be cleaned up to now.
The Octave switches use only half the switch, so it is possible to bridge across to the unused contacts to improve reliability (after cleaning of course).
Instructions, photographs and more detail used to be available on-line (Google is your friend).
:-)
I have these instructions but thought about it might be easier to replace than doing the bridging job.
If the Volume pot is the original Allen-Bradley type, then it is sealed, and you can't get contact spray in there.
Ah, good to know !
If I move the pot back ´n forth a dozen of times or more,- the scratching goes away,- but it comes back.
I expect it to be the original pot because as 1st owner, I´m never became aware it was replaced in the past.
Just take it out, dismantle, clean (using Isopropanol and/or De-Oxit) and rebuild, and assuming it's not worn out, you should be good for another 20 years. It's a lot easier to remove than a wafer switch.
O.k., I see I have to go the hard and tie consuming route now ...
Hope this is of some help,
Yes, it is,- thank you !
John.
PeWe