Panasonic KX-TG2338BXS Service Manual page 66

KX-TG2338BXS / KX-TGA236BXS
17.3.1. Charge Circuit
The voltage from the AC is supplied to the charge circuits. Normal charge of maximum 6-hours is started soon after the Handset
is placed on the base unit. Then it changes to Trickle charge to prevent from overcharging.
Q381 and Q382 detect the ON-HOOK state (Handset is placed on base unit).
Q350 and Q351 control the charge current.
Q352 sends a signal to the handset for about 5 seconds soon after the handset is placed on the base unit.
This signal tells that the handset is been charging on the base unit.
When the signal is received: charging on the base unit.
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