Casio CASSIOPEIA A-20 Service Manual & Parts List page 54

Step Operation
Main ON
Battery
at OFF
Backup
1 : Turn the power off.
battery
2 : Supply the voltage to
backup battery termi-
nals as right figure .
3 : Remove main batter-
ies.
4 : Measure the current.
Vs = 3.0 ± 0.1 V
Display (Wiring)
(Power off)
Backup battery terminal
Is
-
A
V
A-20
+
Vs
(No display)
— 51 —
Note
Current consumption at
OFF.
Measure the current.
Ib = 1.4 mA or under
Connect the items as
shown.
Current consumption of
backup battery.
Measure the current.
Is = 450 µA or under.