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KX-TG2873BXS/KX-TGA280BXS
4.5.3. Charge Circuit
Circuit Operation:
When charging the cordless handset on the Charger Unit, the charge current is as follows;
AC Adaptor: DC+(6.5V) → [R1, R2, R3, R4 → CHARGE+ (Charger)] → CHARGE+ (Cordless Handset) → Q502 → D501 →
L502 → BATTERY+ --- [Battery] --- BATTERY- → L503 → GND → R504 → CHARGE- (Cordless Handset) → [CHARGE-
(Charger) → GND] → DC- (GND)
In this way, the BBIC on Cordless Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q500 of Cordless Handset.
4.5.4. Ringer and Handset SP-Phone
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