Casio PR-420A Service Manual & Parts Catalogue page 7

3. OPERATION CHECK
NO. OPERATION
AC
1
RESET
2
F1
3
SHIFT AC
4
b
F6 a / AC
c
Press the above keys at the
same time.
5
1
6
DISPLAY
MAIN MENU
COMP BASE SD
MAT GRAPH EQUA
LINK CONT
RESET
RESET
RESET ALL MEMORIES?
YES RESET ALL
RESET
ALL MEMORIES!
No Display
== Lx375 TEST
1. LCD 4. ROM
2. KEY 5. TRS
3. RAM 0. rst
No Display
— 5 —
NOTE
REG
PRGM
NO
==