Casio DT-X100 Service Manual page 23

2-2. U-CASE-UNIT and I-CASE-UNIT
(1) Remove the L-CASE-UNIT. (Refer to 2-1.)
(2) Remove 2 connectors of the KEY2-UNIT from
the MAIN-UNIT by lifting them upwardly.
(3) Remove the TAPE/CONNECTOR-B that holds the cables.
TAPE/CONNECTOR-B
(4) Remove the antenna and buzzer cables from the respective connectors on the MAIN-UNIT.
Antenna cable
Antenna connector
(5) Slightly raise the key side of the I-CASE-UNIT,
and then pull it out to separate the I-CASE-
UNIT from the U-CASEUNIT.
(Leaser/2D model)
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Connectors
Buzzer cable
Buzzer connector
I-CASE-UNIT