IBM 6151 Maintenance And Service Manual page 447

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Operator Panel Board Replacement
Be sure the keylock is in the Unlocked position.
Install the operator panel board and mounting screw.
Install the operator panel assembly and mounting screw.
Connect the operator panel cable to the system board.
Do the "Top Cover Replacement" on page 4-13.
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(6/88) Removal and Replacement 4-37