Panasonic KX-TCD410AXM Service Manual page 56

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- DECT BBIC (Base Band IC): IC1
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter,
EEPROM, LCD)
- RF Module: IC3
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for transmission and reception
- EEPROM: IC2
- Temporary operating parameters (for RF, etc)
Note:
Refer to EEPROM LAYOUT (HANDSET)
22.2. Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6V: TP3)
The Reset signal generates R19, C23 and 2.65V.
22.3. Charge Circuit
Circuit Operation:
- When charging the handset on the Base Unit, the charge current is as
follows;
DC+(5.5V ~ 6V)
(Handset)
R21
DC-(GND)
- When charging the handset on the Charger Unit, the charge current is
as follows;
DC+(5.5V ~ 6V)
+(Handset)
CHARGE-(Handset)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q2 of Handset.
Refer to Fig.101 in
TP14(4V)
D4
L4 Q2
GND L5 CHARGE-(Handset)
D1
F1 BATTERY+ ... Battery ... BATTERY-
Power Supply Circuit
Digitized in Heiloo, Holland
().
IC3(6, 27), D3
R43, R44 CHARGE+(Base)
F1 BATTERY+ ... Battery ... BATTERY-
R1, R2 CHARGE+(Charger Unit)
CHARGE-(Charger Unit)
().
56
IC1(37) IC1(39, 63) (2.65V)
CHARGE+
CHARGE-(Base)
R21
GND
11/8/2014
GND
CHARGE
GND
DC-(GND)