Behavior Of Electric Power Failure - Panasonic KX-TGD320ALB Service Manual

KX-TGD320ALB/KX-TGD322ALB/KX-TGD323ALB/KX-TGDA30AZB
4.6.

Behavior of Electric Power Failure

When AC power is lost and lose radio waves, Module PCB turns Q11 on and, battery voltage appear to CHG terminal.
When CHG+ (supply voltage from handset) is higher than Vbat, Q351 is on. And, this unit continues working in power failure
condition.
It's possible to use the units during the power failure, supplying power to VBAT of base unit from battery of handset through Q10,
CHG terminal and Q351.
HANDSET BASE
CHG+
Vbat
Q10
Q351
Battery
R355
CHG-
R45
R354
R13
Q352
Q11
3
R12
R11
17