JRC JMA-5212-4, Service Manual

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(4) Remove the 20 setscrews, and remove
the front cover.
(Phillips screwdriver for 3 mm screws)
(5) Peel off the key rubber, disconnect
the connector, and replace the board.
[Mounting]
(1) Assemble the operation unit in reverse order of removal.
When mounting the front cover, make sure that the keys on the key rubber fit snugly into the
corresponding holes in the front cover.
[Operation check]
(1) Check that the equipment starts normally.
(2) Check that an error message is not displayed.
(3) Perform a key test, buzzer test, and light test according to Section 8.3.1.3 of the instruction manual,
and check that no abnormality is detected.
(4) Check that the controls turn smoothly.
(5) Confirm that you feel the reaction (clicking) of each control when pressing it.
Remove Peel off