Power Supply Circuit - Panasonic KX-TG5521RUB Service Manual

4.2.2.

Power Supply Circuit

The power is supplied to the DECT BBIC, RF Module, EEPROM and Charge Contact from AC Adaptor (+6.5 V) as shown in
Fig.101. The power supply is as follows;
• DECT BBIC (IC7):
DC Jack (+6.5 V) → IC2 → IC7
DC Jack (+6.5 V) → IC2 → Q9 → IC7
DC Jack (+6.5 V) → IC2 → Q8 → IC7
• RF Power Amp. (IC801):
DC Jack (+6.5 V) → IC2 → IC801 (Power AMP)
• EEPROM (IC401):
DC Jack (+6.5 V) → IC2 → IC7→ IC401
• FLASH MEMORY (IC421):
DC Jack (+6.5 V) → IC2→ IC7→ IC421
• Charge Contact (TP16):
DC Jack (+6.5 V) → R56 → R55 → D22→ TP16
6.5 V
DCP
DC
DCM
Jack
AC Adaptor
1
DC S
2
1.8 V
3
Reset
(IC7_61pin)
3.0 V
IC2
R56
R55
On
2.4 V
Q9
1.8 V
Q8
TP16
D22
<Fig.101>
9
KX-TG5521RUB/KX-TGA551RUB
RF Power Amp. (IC801)
3.0 V
2.5 V
IC7
3.0 V
Off
IC401
IC421