Cordless Handset Board (Pcb100) - Panasonic KX-FC255CX-S Service Manual

KX-FC255CX-S

18.10. Cordless Handset Board (PCB100)

Charge Current
J1 F1
5.6n
J2 R47 5.6k
R46 5.6k
TP20
L4
J3
10u
L5
J4
10u
R8
2
TP21
1k
Q5
+2.5V
UTX R61 1k
URX R62 1k
GND
JTAG R63 NC
25mVp-p
0.7V
0V
COL0
COL1
COL2
COL3
COL4
COL5
E
B
C
Q7
NC: No Components
Back light OFF: 4.2V
Back light ON: 3.5V
BAT BATTERY
L1
1
47u
3
2
Q1
D7
1 2
(When on charge)
3
1
2
3
Q9
1
1s
UTX
+1.8V
URX
ROW1
C19 K0.1u
C24 K0.1u
JTAG
LCD_BACK
LCD_CSB
RESET
RINGER_LED
LCD_CD
ROW2
C20 K0.1u
RSSI
C25 K0.1u
+2.5V
E
B
C
Q8
115kHz
(Talk Mode)
VDD3
VDD4
+4.2V
D1
1 2
2
+2.5V
D2
Q3
R2
1
68
C30
K0.1u
R15
C31
3.3k
NC
C32
K0.1u R16
+2.5V 1k
NC
C33
1
*INT1/P11
2
VDDIO1
3
VDD1
4
VSS1
5
LED1/PWM0/P20
6
LED2/PWM1/P21
7
LED3
8
LED_BIAS/P36/PD6
9
SDA1/P25
10
IC1
SCL1/P24
11
*INT5/VDDE/P15
12
BBIC
*INT2/P12
13
AVD
14
AVS
15
CAP
16
Xtal1
17
VSSRF
18
RFCLKp
19
RSSI/RFCLKm
20
VDDRF
TX DATA
RX DATA
+2.5V
C27
1u
NC
L6
216
2.5V
1.8V
VDD2 VDD1
+1.8V
Q2
+1.8V
POWER
C38
K0.01u
R11 39k
1 2
S1
60
LDO2_CTRL
59
LDO1_CTRL
58
VBAT1
57
DC_Sense
56
DC_CTRL
55
DC_I
C18 K1000p
54
DC_STAB
53
*RST
52
P17/CHARGE/INT7
51
P23/ADC1
50
VDD3
49
VSS3
48
P07/SPIDI/PCM_DIN
LCD_SDA
47
P06/SPIDO/PCM_DOUT
LCD_SCL
46
P05/SPICLK/PCM_CLK
45
P04/SCL2
44
P03/SDA2
JTAG
43
P02/JTIO
URX
42
P01/URX
UTX
41
P00/UTX
BATTERY
C114
1n
R108 10k
(1)
(2)
(3)
(4)
(5)
LDO2_CTRL
LDO1_CTRL
DC_CTRL
DC_I
(6)
C8 K0.22u
CHARGE
(7)
(8)
(9)
(10)
(11)
(12)
+4.2V
R71 47 LED1
R70 NC
LED-
R73 1k 3
1
2
Q12