Hmm, OK, but that value doesn't seem to make a whole lot of sense. I would suggest these follow-up actions:
The first thing I would do would be to clean off the solder joints on the Speed pot so that we can visually inspect those joints and the PCB trace connections to them. Right now, the pooled up and partially discolored solder mask residue (see cropped image below) makes it very difficult to see what's going on there. I would use the blade of a small flat-head screwdriver to gently scrape the solder mask away around the pot joints and brush off the loosened residue with a toothbrush or other small, stiff-bristled brush. Once that area is cleaned up, please post a new photo or two so that we can visually inspect the connections.
Next, take a series of resistance measurements across the pot to determine its functionality. Disconnect power from the pedal and place one of your meter probes into one of the corner screw bosses--this is your ground connection. With the Speed pot turned
all the way CCW, take resistance readings by placing the other meter probe:
- On the left lug solder joint
- On the middle lug solder joint
- On the right lug solder joint
Since the middle and right lugs are connected by a short PCB trace, they should give the same resistance reading, equal to the approximate resistance rating of the pot (~100 Kohms). The left lug is connected to ground and should therefore show a resistance of ~zero.
If that all pans out, then turn the Speed pot
to its midpoint and measure the resistance at the right lug. On my BT, that value is ~16 Kohms. The turn the pot
all the way CW and repeat the measurement. Should be nearly zero resistance, or a couple of ohms at the most.
Please post all your results here.
Attachment:
BHT_speed_pot_joints.jpg [ 61.18 KiB | Viewed 6637 times ]
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