Casio DT-940 Service Manual page 22

3.3.10 MAIN-BOARD DISASSEMBLY/ASSEMBLY
MAIN-BOARD is attached to I-CASE. I-CASE must be removed after disconnecting all the cables from
LCD and KEY to MAIN-BOARD.
Procedures
(1) Remove two C screws (+, silver) on the CPU side.
(2) Detach KEY-HOLDER.
(3) Remove three B screws (+, silver) on the CPU side.
(4) Separate MAIN-BOARD from I-CASE.
* For the assembly, reverse the above order.
(3) B Screw
(3) B Screw
(2) Remove KEY-HOLDER after detaching two C screws (1).
(3) B Screw
(1) C Screw
(1) C Screw
(4) Separate MAIN-BOARD from I-CASE after removing
< How to set battery terminals >
Do not set the terminals halfway or askew.
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three B screws (3).
Do not attach them askew.
Set them deeply over the
convexities of the case.