Just bought oldiegoldie ECoS 50000. CS are used for a years, so I wait for a problems :) But at the time, there was only one problem, left side jog dial does not move in to correspoding position. If I changed position via touchscreen, motor tried to start but stops unexpectedly.
Ok, let's disassemble it. Removing sniffer module, cover of second extension module, remove screws, remove down cover, remove left and right jog dials blocks, disconnect cables.
First, I have tested dials. Connected right dial to left cable, and vice versa. As a result - right dial perfectly work in the left position. So, problem inside motorized potentiometer in the left dial block.
Jog dial block consist of circuit board and motorized potentiometer soldered right to the board. Potentiometers produced by SoundWell from China.
(images in original size available via r-click, open image in the new tab)
FYI: For removing caps of dials and joysticks - just pull it up. There is a nut under dial cap and 4 screws which holds a board. Take it off and get a board with a potentiometer,
Tested motor with DC 4.5V. Motor tried to start but not rotate. On the other dial it starts to rotate with 4.5V. Ok, motor was alive, problem inside potentiometer. At this point I noticed - to rotate non-working dial I need a much more force to rotate dial unlike the other dial. Hence I thinked the problem is in potentiometer kinematic.
Next, I have bended back 4 holders on the potentiometer. Removed the body. And sees gear with spring and spring holder. Spring and pring holder deliver some resistance to dial rotating. In my case, T - shaped pin on the gear was damaged. So spring had apllied too much force.
Gear and spring on the left, gear without spring on the right.
On the right image we can see damaged T-shaped pin.
Because I don't have such gear, just had removed spring and holder and assembled potentiometer. Tested it with 4.5V DC and its working fine.
Assemble everything back.
As a result - I have normally working jog dial. But, it rotate softer than original and sound of the movement slightly louder.
Hope I will find original potentiometers and will replace both.