MITSUBISHI ELECTRIC MR-E- A/AG - Manual (Page 78)

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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. 2) Push the screwdriver in the
direction of arrow. 3) With the screwdriver pushed, insert the cable in the
direction of arrow. (Insert the cable as far as it will go.)
4) Releasing the screwdriver connects the cable.