Panasonic KX-TG8151RUB / KX-TG8151UAB / KX-TG8151CAB / KX-TG8161RUB / KX-TG8161UAB / KX-TG8161CAB / KX-TGA815RUB Service Manual ▷ View online
13
KX-TG8151RUB/KX-TG8151UAB/KX-TG8151CAB/KX-TG8161RUB/KX-TG8161UAB/KX-TG8161CAB/KX-TGA815RUB
4.4.5.1.
Charge Circuit
The voltage from the AC adaptor is supplied to the charge circuits.
D
3
62
R
3
72
R
3
71
CHARGE+
F301
DCP
CHARGE-
+5.5V
DCM
14
KX-TG8151RUB/KX-TG8151UAB/KX-TG8151CAB/KX-TG8161RUB/KX-TG8161UAB/KX-TG8161CAB/KX-TGA815RUB
4.5.
Block Diagram (Handset)
QSPI
FLASH MEMOR
Y
IC4
SPEAKER
RECEIVER
Headset J
a
c
k
CN4
MIC
CHARGE
P
o
w
er F
ailer Mode
P
o
w
er Supply SW
CIRCUIT
Q2, Q
3
, Q4,
Q
2
,
Q
3
,
Q
4
,
Q9, R8Q
9
,
R
8
CHARGE
CONT
A
CTS
CHARGE(+)
CHARGE_CTRL
BA
TTER
Y_ON
CHARGE_DET
EEPR
OM
SCL
SD
A
BA
TTER
Y
TERMINAL
R45
VBA
T
BA
TT
-
1.8 V
Q1
1.8 V
CP 2.8
V
LCD
CD
RESET
CSB
SD
A
SCL
CPU
Analog
F
ront
End
D/A
A/D
3
4
3
6
2
3
24
19
20
21
29
33
3
2
58
59
85
26
4
3
44
64
55
56
69
67
ADPCM
Codec
Filter
DSP
Speech
Decoding
Speech
Encoding
BMC
Burst
Decoding
ANT1
Burst
Encoding
RF
PLL
MOD/DEMOD
5
2
3
79
78
RXn
RXon
ANT1
D
A801
RXp
TXp
TXn
TXon
9
10
XT
AL
X1
10.
3
68
MHz
BA
TTER
Y
45
ON SWITCH
KEYP
AD
Charge
Pump
RO
W
S
COLUMNS
CP
3
V
D
3
CP2.8V
CP_LED
49, 50, 51, 52
1
3
, 14, 15, 16, 27,47
90, 92, 94, 96 QSPI-IO 0-
3
BBIC
IC1
IC3
57
LCD-BA
CK LIGHT
KEY LED
BELL LED
5
3
72
80
LDO_CTRL
CP
3
.0 V
CP
3
V
QSPI
Control
91 QSPI-SCK
95 QSPI-CS
TGA815 only
71
Q10, Q11, Q12, R10Q
1
0
,
Q
1
1
,
Q
1
2
,
R
1
0
70
KX-TGA815 BLOCK DI
A
GRAM (Handset)
15
KX-TG8151RUB/KX-TG8151UAB/KX-TG8151CAB/KX-TG8161RUB/KX-TG8161UAB/KX-TG8161CAB/KX-TGA815RUB
4.6.
Circuit Operation (Handset)
4.6.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.14).
• 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 Power Amp.)
- PLL Oscillator
- Detector
- Compress/Expander
- Reception
- Integrated 1.9 GHz PA for DECT
- All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD, RF Power Amp.)
- PLL Oscillator
- Detector
- Compress/Expander
- Reception
- Integrated 1.9 GHz PA for DECT
• QSPI FLASH MEMORY: IC4
- Main Program D/L Area
• EEPROM: IC3
- Temporary operating parameters (for RF, etc.)
4.6.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+)
BATTERY(2.2 V ~ 2.6 V: BATT+)
F1 Q2 (1.8 V), IC1-43pin (3.0V)
The Reset signal generates IC1 (62 pin) and 1.8 V.
4.6.3.
Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+(5.5 V)
R371 R372
CHARGE+(Base) CHARGE+(Handset)
Q3 F1
BATTERY+... Battery...
BATTERY-
BATTERY-
R45 GND CHARGE-(Handset) CHARGE-(Base) GND DC-(GND)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q9 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.12).
The charge current is controlled by switching Q9 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.12).
4.6.4.
Battery Low/Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 2.25 V ± 50 mV
The BBIC detects this level and "
" starts flashing.
• Power Down
Battery voltage: V(Batt) 2.0 V ± 50 mV
The BBIC detects this level and power down.
The BBIC detects this level and power down.
4.6.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
1.8 V
Reset
(IC1_62pin)
(IC1_62pin)
Battery +
R373
D362
D362
Q2
R8
R8
16
KX-TG8151RUB/KX-TG8151UAB/KX-TG8151CAB/KX-TG8161RUB/KX-TG8161UAB/KX-TG8161CAB/KX-TGA815RUB
4.7.
Circuit Operation (Charger Unit)
4.7.1.
Power Supply Circuit
The power supply is as shown.
D1
R2
R1
TP1
TP2
J1
AC Adaptor
F1
Click on the first or last page to see other KX-TG8151RUB / KX-TG8151UAB / KX-TG8151CAB / KX-TG8161RUB / KX-TG8161UAB / KX-TG8161CAB / KX-TGA815RUB service manuals if exist.