Keyboard Sustain Pedal is not working because the [default] Right hand Lug on the Rheostat does not conduct.
[After several tests,including continuity] [Rheostat is for partial pedalling on MP11 Keyboard, Sustain Pedal,Model F-30 ]
Rheostat is labelled"203B"
NOTE: The Rheostat Ground lug & the left hand lug are both conducting! [But the left hand lug won't work for this style Keyboard]
There is visible,but very tight to access to: 3 very thin Pale Green Traces,3/32 in long to each of the lugs,
but no surrounding dark green solder mask, on a chip of brown Bread Board, ½ in square.
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The Rheostat looks difficult to replace as it's connected to a series of gears & I would have a lot disassembling to reach it .
Before replacing the Rheostat should I :
1] Drill out the right hand lug to get access to the trace & pad & make an alternate connection
I would guess there's a pad,but I don't know if there's solder joint, or copper coated hole -- and Drilling could damage all of these.
2] Scrape off the green mask layer of the very thin Pale Green Trace--but this could damage the copper Trace!
-------------------------------------------------------
How would you suggest I proceed?
In your experience is it likely there's a pad ,solder joint, or copper coated hole underneath the lug?
Sorry these are the best photos this camera can make!
[After several tests,including continuity] [Rheostat is for partial pedalling on MP11 Keyboard, Sustain Pedal,Model F-30 ]
Rheostat is labelled"203B"
NOTE: The Rheostat Ground lug & the left hand lug are both conducting! [But the left hand lug won't work for this style Keyboard]
There is visible,but very tight to access to: 3 very thin Pale Green Traces,3/32 in long to each of the lugs,
but no surrounding dark green solder mask, on a chip of brown Bread Board, ½ in square.
------------------------------------
The Rheostat looks difficult to replace as it's connected to a series of gears & I would have a lot disassembling to reach it .
Before replacing the Rheostat should I :
1] Drill out the right hand lug to get access to the trace & pad & make an alternate connection
I would guess there's a pad,but I don't know if there's solder joint, or copper coated hole -- and Drilling could damage all of these.
2] Scrape off the green mask layer of the very thin Pale Green Trace--but this could damage the copper Trace!
-------------------------------------------------------
How would you suggest I proceed?
In your experience is it likely there's a pad ,solder joint, or copper coated hole underneath the lug?
Sorry these are the best photos this camera can make!
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