C4 Maintenance  3. Covers 
 
14  C Series Maintenance Manual Rev.2 
3. Covers 
This chapter describes  procedures for removing and installing covers and arm spacers in 
maintenance. 
 
 
WARNING 
■
Do not connect or disconnect the motor connectors while the power to the robot 
system is turned ON.  Connecting or disconnecting the motor connectors with 
the power ON is extremely hazardous and may result in serious bodily injury as 
the Manipulator may move abnormally, and also may result in electric  shock 
and/or malfunction of the robot system. 
■
To shut off power to the robot system, disconnect the power plug from the power 
source.    Be sure to connect the AC power cable to a power receptacle. 
DO NOT connect it directly to a factory power source. 
■
Before  performing  any replacement procedure,  turn OFF the  Controller  and 
related equipment, and then disconnect the power plug from the power source. 
Performing any replacement procedure with the power ON is extremely 
hazardous and may result in  electric shock and/or malfunction of the robot 
system. 
■
Be careful not to get any foreign substances in the Manipulator, connectors, and 
pins during maintenance. Turning ON the power to the robot system when any 
foreign substances exist in them is extremely hazardous and may result in electric 
shock and/or malfunction of the robot system. 
 
Name  Quantity  Note 
Too ls 
Hexagonal wrench (width across flats: 2.5 mm) 
For M3 hexagon socket head cap bolts 
Hexagonal wrench (width across flats: 3 mm) 
For M4 hexagon socket head cap bolts 
 
 
Connector plate 
 
Connector sub plate 
 
Arm #4 side cover 
 
Arm #3 head cover 
 
Arm #1 top cover 
 
Base bottom cover 
 
Arm #3 
bottom cover 
 
User plate 
 
Arm #4 side cover 
 
Arm #2 side cover 
 
Arm #1 side cover 
 
Arm #2 side cover 
 
Arm #1 side cover