IBM 1412 - Manual (Page 44)

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When replacing the keyboard, make sure that the 3 cables
are clean and insert them directly into the connectors,
making sure they contact with the bottom of the connector.
Now press down on the latch of the connector to secure.
Note: If the cables do not touch the bottom of the con-
nector, the keyboard function will be rendered
useless.
Attention: The cables of the keyboard are fragile and
could be damage. Be careful in pulling out the cables.
40 ThinkPad i Series 1400