Epson LS-B Series Maintenance Manual page 105

NOTE
LS3-B: A brake is mounted on the motor of Joint #3 to prevent the shaft from moving down

LS6-B: A brake is mounted on the motor of Joints #3 and #4 to prevent the shaft from moving
Move the shaft down to its lower limit before the replacement procedure following the
removal steps.
Ball Screw (1) Turn ON the Controller.
Spline Unit
(2) Push down the shaft to its lower limit while pressing the brake release switch.
Removal
(3) Turn OFF the Controller.
(4) Detach the wires/tubes from the end effector, and remove the end effector.
(5) This step is only for Cleanroom-model.
(6) Remove the Arm Top Cover and Arm Bottom Cover.
(7) Remove the following.
(8) Remove three screws mounting the spline
(9) Remove four screws mounting the spline nut.
LS-B series Maintenance Rev.1
LS3-B LS6-B Maintenance 10. Ball Screw Spline Unit Replacement
due to the weight of the end effector while the power to the Controller is OFF or
while the motor is in OFF status (MOTOR OFF).
down and rotating due to the weight of the end effector while the power to the
Controller is OFF or while the motor is in OFF status (MOTOR OFF).
Be sure to keep enough space and prevent the end effector hitting any peripheral
equipment.
LS3-B: The brake release switch is applied to Joint #3.
When the brake release switch is pressed, the respective brake of the Joint #3 is
released.
Be careful of the shaft falling while the brake release switch is being pressed
because the shaft may be lowered by the weight of an end effector.
LS6-B: The brake release switch is applied to both Joints #3 and Joint #4.
When the brake release switch is pressed, the respective brakes of the Joint #3
and Joint #4 are released simultaneously.
Be careful of the shaft falling and rotating while the brake release switch is
being pressed because the shaft may be lowered by the weight of an end effector.
Remove the bellows. For details, refer to 9. Bellows.
For details, refer to 3. Covers.
Joint # motor unit Joint #4 motor unit Joint #4 intermediate pulley
U1 belt U2 belt Z belt
Follow the U2 belt removal steps in 8.2 Replacing the Timing Belt.
plate.
3-M4×12
4-M4×12
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