Remove Top Access Panel.
Unscrew the 6 phillips screws that attach the topmost panel of the arm-and-leg
assembly. Lift off the panel while threading cables through hole. Push
the cables completely through the hole and set the panel aside.
Inside, are the drive gears and motor for raising and lowering
the right arm. The interrupter for the encoder disc is
visible at the top of the photo at right (tan PCB).
The disc itself is behind another panel. At 10 o'clock in this photo,
there's a
tilt sensor consisting of a pendulum and cage.
The photos below show close-ups of the front and back of the tilt sensor.
A coiled hair wire allows current flow through the pendulum bob without inhibiting its motion.
Detach the Arm.
Separate the right arm from the right leg by removing 4 phillips screws
from the black center gear. Pull the arm away from the leg. The encoder
disk for arm rotation is located between the arm and leg assemblies (photo
at right).
