Panasonic KX-TG9471B Service Manual page 9

4.2.2. Power Supply Circuit
The power is supplied to the DECT BBIC, RF Module, EEPROM, TAM Companion, OP Amp, and Charge Contact from AC
Adaptor (+6.5 V) as shown in Fig.101. The power supply is as follows;
• DECT BBIC (IC501):
CN301 (+6.5 V) → F301 → IC341 → IC326 → Q386 → IC501
CN301 (+6.5 V) → F301 → IC341→ IC326 → Q381 → IC501
• RF Module (IC801):
CN301 (+6.5 V) → F301 → IC321→ IC801 (PLL) (Power AMP)
• EEPROM (IC551)/FLASH MEMORY 1 (IC761)/FLASH MEMORY 2 (IC561)/Latch (IC631/641)/OP Amp (IC171):
CN301 (+6.5 V) → F301 → IC341 → Q381 → IC761, IC561, IC171, IC631, IC641, IC551
• TAM Companion (IC701):
CN301 (+6.5 V) → F301 → IC331 → IC701
CN301 (+6.5 V) → F301 → IC341 → Q386 → IC701
CN301 (+6.5 V) → F301 → IC341 → Q381 → IC701
• OP Amp (IC161, IC261):
CN301 (+6.5 V) → F301 → Q386 → IC161/IC261
F301
CN301
AC Adaptor
VBUS
CN901
USB JACK
+6.5 V
+2.5 V
IC321
+4.0V
IC341
+3.3V
IC331
Photocoupler
IC902
+5.0V
IC903
USB
IC904
IC905
Isolated circuit
+3.0 V
Q381
+1.8 V
Q386
Q541
Reset
IC902
IC903
IC904
IC905
<Fig.101>
9
KX-TG9471B/KX-TG9472B/KX-TGA939T
RF Module (IC801)
IC761, IC551, IC631,
IC641, IC171
BBIC (IC501)
IC161, IC261
IC561
TAM IC (IC701)