Mitsubishi Electric GENERAL PURPOSE AC SERVO MR-E- A/AG Instruction Manual page 78

3. SIGNALS AND WIRING
(c) 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.
3 - 47
3) With the screwdriver pushed, insert the cable in the
direction of arrow. (Insert the cable as far as it will go.)