Mitsubishi Electric JT-SB116EH-W-CA Handbook page 25

7 Removing the switch cover, disconnect the relay connector.
(indicated by )
8 Remove the knob. (indicated by
Caution for assembly
Install the knob aligning with the form of volume shaft.
9 Remove volume circuit board clamping nut. (indicated by
(3) Indicator circuit board and illumination circuit
board.
1 Remove the maintenance cover. See (2) 1.
2 Disconnecting lead wires, remove the indicator circuit board
and the illumination circuit board from the spacers.
(indicated by )
)
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)