Planmeca Compact I, Technical Manual

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Chapter H - FOOT CONTROL
Planmeca Compact i H-5
PARTS REPLACEMENT & REPAIR
Technical Manual
1.6 Replacing pedal centering spring
a) Remove the foot control cover as described in section “Removing foot control cover” on page
H-1.
b) Remove the chair control assembly as described in section “Replacing chair control springs”
on page H-2.
c) Detach the foot control cable from the connector P1 on the foot control PCB.
d) Unscrew the four M4x10 DIN 7991 screws and remove the foot control PCB.
e) Unscrew the two M4x16 DIN 7991 screws that hold the bearing bar in position and remove
the bearing bar and the spring washer.
f) Remove the pedal assembly. (If necessary, screw in the pedal height adjuster screw on the
underside of the foot control, then lift the pedal assembly off the foot control.)
g) Loosen the angle adjusting screw and the tension adjusting screw.
h) Remove the pedal centering spring from the pedal axle.
i) Put the new pedal centering spring and the new spring support on the pedal axle. The ends of
the new pedal centering spring should go through the slots in the side wings of the pedal
centering plate.
j) Remount the pedal assembly by lightly tapping the pedal axle with a hammer and securing it
with the two M4x16 DIN 7991 screws. Make sure that you position the spring washer the right
way around with the convex side facing downwards.
k) Center the pedal, calibrate the sector plate and adjust the pedal height as described in
section “Calibrating the sector plate and adjusting the angle of the foot control pedal (new foot
control model, from serial number 826740)” on page H-11.
l) Eliminate the horizontal pedal play as described in section “Eliminating sideways play of the
foot control pedal” on page H-8.
m) Put the foot control PCB back in position and secure it with the four M4x10 DIN 7991 screws.
Connect the foot control cable to the connector P1.
n) Adjust the pedal tension and angle as described in section “Adjusting tension and angle of the
foot control pedal” on page H-9.
o) Secure the chair control assembly with the M4x10 DIN 7991 screws and remount the foot
control cover.