Re: Alto L12 mixer, only 2007



N_Cook wrote:

" * I have heard that you can use copier toner dust to melt over a
section of worn resistor material and repair it. "

probably referring to my tip for worn pots, fully detailed here

Dismantle the pot down to the carbon track clean/degrease.
Make up resistive compound from photocopier toner and graphite powder
obtainable from locksmiths for dry "lubrication".
the following resistivity values are very approximate for .02 inch thick
film.
graphite:toner ratios
1:1 ,200 ohm per square inch
1:10, 100k ohm per square inch
1:30 10M ohm per square inch
Mask off area surrounding carbon track,sprinkle on the powder,fuse the film
in a low oven approx 150 degrees centigrade or hold the barrel of a
soldering
iron 1mm from the powder to heat .When fused lightly abraid with a
nail file,and reassemble pot.High ohmic pots are a bit iffy,low ohmic are
fine.
p.s. I would be interested to hear of any suggestions for higher resistivity
addmixture for higher ohmic pots (for more even distribution)

Which I will probably use for this Chinese pot. the main problem with it is
not having a nice flat surface after "curing". Needs some sort of aqua
process perhaps to give an initial flat surface.
Aquadag or whatever EFI/EMI screening black (dries to slightly brown side of
black) stuff is , may be useful for very low ohm but probably too brittle
and does not adhere to impervious surfaces.
My can of it is too old to get product details RS stock number "551-570"
other than it contains MEK and xylene

And all because you wont buy the correct right replacement part ? What kind of
moron are you ?

The damn manufacturer's name or logo should be on it btw.

I hate to think what the bill for this bodged repair will be.

Graham

.

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