Charge Circuit; Ringer And Handset Sp-Phone; Sending Signal - Panasonic KX-TG2220BXB Service Manual

KX-TG2220BXB / KX-TG2220BXF / KX-TG2220BXS / KX-TGA226BXB / KX-TGA226BXF / KX-TGA226BXS

18.4. Charge Circuit

Ni-MH battery is connected to (BATT+, BATT-). When the handset is put on the cradle of the base unit, the power is supplied from
CHARGE1 and CHARGE2 terminals to charge the battery. Q207 detects the voltage of CHARGE1 and CHARGE2 terminals, then
the handset makes ID code setting (*) with the base unit.

18.5. Ringer and Handset SP-Phone

DSP (29-31) → SP/RINGER

18.6. Sending Signal

The voice signal from the microphone input to DSP (46-47). CN203 is the headphone jack. When the headphone is connected, the
Q206 detect it. The input from the microphone of the handset (MIN, MIP) is cut and the microphone signal from the headphone is
input to DSP (36). Also the power for the microphone is supplied from Q211, and the power is turned OFF on standby.
Note: DSP is IC201.
See CPU DATA (HANDSET) (P.60).
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