Voltage Detectors Check - Casio CASSIOPEIA A-20 Service Manual & Parts List

Voltage Detectors Check

Check the following detectors;
Low battery message detector for alkaline batteries.(2.0 V ± 1 %)
VDET1:
Foced power off detector for alkaline batteries.(1.6V ± 1 %)
VDET2:
Low battery message detector for rechargeable battery.(3.3 V ± 2 %)
VDET1R:
Foced power off detector for rechargeable battery.(3.0 V ± 2 %)
VDET2R:
Low battery message detector for back-up battery.(2.7 V ± 1 %)
VDETS:
Step
Operation
Vb = 2.6 ± 0.02 V
Setting
ENTER, 7, 1
VDET1 Put power supply voltage
down by degrees.
VDET2 Put power supply voltage
down by degrees.
Display (Wiring)
Alkaline battery terminal
-
V
+
Vb
AC adapter Charger
VDET1 OFF
VDET2 OFF
VDET1R OFF
VDET2R (indefinite)
VDET3 OFF
VDETS ON
Recharge OFF
CHKPRG OFF
AC Adapter USED
Cover CLOSED
CardLock CLOSED
Cradle NOT STAY
VDET1 ON
VDET2 OFF
VDET1 ON
VDET2 ON
— 52 —
Note
Connect the items as
shown.
A-20
Measure the voltage that
VDET1 becomes ON.
VDET1 = 2.0 V ± 5 %
Measure the voltage that
VDET2 becomes ON.
VDET2 = 1.6 V ± 1 %