Read Panasonic KX-WT115RU Service Manual online
10
KX-WT115RU
4.3.3.
Charge Circuit
Circuit Operation:
When charging the handset on the Charger Unit, the charge current is as follows;
DC+pin of J1(+)
DC+pin of J1(+)
→ F1 → R1 → CHARGE+pad → CHARGE+(Handset) → Q4 → D7→ F1 → BATTERY+... Battery...
BATTERY-
→ R45 → GND → CHARGE-(Handset)→ CHARGE-pad → DC-pin of J1(-)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q9 of Handset.
The charge current is controlled by switching Q9 of Handset.
4.3.4.
Battery Low/Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 2.35 V ± 50 mV
The BBIC detects this level and "
The BBIC detects this level and "
" starts flashing.
• Power Down
Battery voltage: V(Batt) 2.0 V ± 50 mV
The BBIC detects this level and power down.
The BBIC detects this level and power down.
4.3.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
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