Mitsubishi Electric MELSERVO-J3 Series Manual page 141

4. SIGNALS AND WIRING
3) When using the flat-blade screwdriver - part 2
1) Insert the screwdriver into the
square window at top of the
connector.
4) Releasing the screwdriver connects the cable.
2) Push the screwdriver in the
direction of arrow.
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3) With the screwdriver pushed, insert the cable in the
direction of arrow. (Insert the cable as far as it will go.)