Casio CE-300 (EX-247) Service Manual page 15

2. Switch status test
Press "C" button, the switch status is appeared on the display.
[DISPLAY]
— 13 —
No display
No display
No display
No display
Low battery
L: Low battery
Nil: Battery OK
PAD2 status
1: Short
0: Open
PAD1 status
1: Short
0: Open
Always: 1
Drawer sensor
1: Close
0: Open
Mode switch status
1: PGM
2: RF
3: REG
4: CAL
5: X
6: Z
No display: OFF