The pedals are enclosed in a metal box, stuffed inside a hollow MDF base. The pedals were making some "squeeks" each time they were pressed and were bottoming out quite hard, so this was a good candidate to start the operation.
Lets get on with the pics:
Detail of the mechanism:
As you can see, the mechanism is quite simple. The pedal resistance is managed by a spring and when pressed brings the two metal sheets into contact. The next photo shows the mechanism when pressed:
The problem with the "squeeking" was readily identified as the pedal was slightly rubbing the adjacent platic. This was promply corrected with some lubrication with lithium grease:
As to the sound of the bottoming of the pedal and when it was released, it was due to the rubber stops being out of place and the felt cloth being worn. These rubber stops were again put to their places with contact glue and the felt reinforced with some quick patches.
Rubber stops while being glued:
Placing new felt (you may see the wear on the original felt):
All fixed up with rubber stops in action:
For completeness sake, the pedal is connected to the DP main body through a MIDI connector, even though it only signals a continuity test (when pressed) on these pins:
Pins 3, 5: Left Pedal
Pins 2, 4: Middle Pedal
Pins 1, 4: Right Pedal
Here's a photo of the connector:
The pedals are now working again, this time a lot more silently, as they should.
On the next thread, we'll start dealing with the internals.