Voltage Detectors Check - Casio PA-2400U Service Manual And Parts List

Voltage Detectors Check

Check the following detectors;
VDET1: Low battery message detector for alkaline batteries.(2.1V)
VDET2: Foced power off detector for alkaline batteries.(1.6V)
VDET1R: Low battery message detector for rechargeable battery.(3.6 V )
VDET2R: Foced power off detector for rechargeable battery.(3.0 V)
VDETS: Low battery message detector for back-up battery.(2.7 V )
Step Operation
Vb = 2.6 ± 0.02 V
Setting
Tap "21.LB" on the dis-
play.
VDET1
Put power supply voltage
down by degrees.
Put power supply voltage
VDET2
down by degrees.
Display (Wiring)
Alkaline battery terminal
-
V
PA-2400U
+
Vb
AC adapter Charger
<< LB >>
VDET1 OFF
VDET2 OFF
VDET1R OFF
VDET2R OFF
VDETS OFF
Li
AM3
[ Push Notification Button ]
VDET1 ON
VDET2 OFF
VDET1 ON
VDET2 ON
— 61 —
Note
Connect the items as
shown.
Measure the voltage that
VDET1 becomes ON.
=
VDET1 2.1 V
Measure the voltage that
VDET2 becomes ON.
=
VDET2 1.6 V