Casio EX-830 Service Manual page 29

A-6. Secure it with 17 screws.
NOTE: Tighten the screws in the order of the numbers indicated in the illustration below.
11
15
8
6
10
14
A-7. Engage the COM Chassis and the Main PCB, and then secure them with five screws.
1 3 9
2
4 12
— 27 —
13
5
7
17
16
Screws (S5)