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KX-TG155SK/KX-TGA660M
4.10. Behavior of Electric Power Failure
In case that the power from AC adaptor is lost and lose radio waves, BBIC (IC1) turns IC6 ON since handset presumes that
base unit's power is failed.
Base unit detects that power voltage of AC adaptor +5.5V is OFF at IC351, then turns Q351 ON.
It's possible to use the units during the power failure, supplying power to VBAT of base unit from battery of handset through IC6,
CHG terminal and Q351.
BATT+
BATT_
4.11. Circuit Operation (Charger Unit)
Charge control is executed at handset side so that the operation when using charger is also controlled by handset.
Refer to Circuit Operation (Handset) (P.22)
The route for this is as follows: DC+pin of J1(+) → F1 → R1 → CHARGE+pad → Handset → CHARGE-pad → DC-pin of J1(-).
Handset
IC6
VOUT
VIN
COUT
3
R45
BBIC
IC1
F1
J1
AC Adaptor
CHG+
Q351
R354
D1
CHG-
R355
R1
24
Base Unit
+5.5V
IC351
R351
VOUT
VIN
VSS
R352
TP1
TP2
VBAT
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