Panasonic AUTO-LOGIC KX-T4330 Service Manual And Technical Manual page 46

| KX-T4330
@ CHARGE DETECT CIRCUIT
When the battery in the portable handset is charged, the voltage at the (+) charging terminal changes from 9 V-»5 V (Fig. 33 @),
This CHARGE input is received by CPU IC9, making Pin 32 active, and the DATA signal is sent to the portable handset by the
control terminal via Q49.
Charge stail
9.2V ———
(a) 4.7V ------
Cp ene
0.2V
R203
re at Sarge
ty got)
CPU DSi
Ico @
Charge LED will light
CHARGE
R214
i is FROG OULOl
CK HITKR)DOe
F ——isiC
"wn,
Ico@ 5.7 |
D9 V rt
CPU R219
Ico @
TULL
TX DATA
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Fig. 32
mM CHARGE MODE
Q46 R304
Emitter
R2i9
Fig. 34
eSetup of the portable handset
Whencharging the-portable handset on the base unit, the data signal is sent from CONT terminal to portable handset, T he Q49
switching are affected by Pin 32 of IC9, the sending data are CH data, ID code, tone or pulse signal etc. While charging, these data
kept sending. The CPU of portable handset is operated irrespective of on or off of power switch, and these data are received to the
CPU.