Panasonic KX-TCA275RU Service Manual ▷ View online
53
KX-TCA275RU
12 Miscellaneous
12.1. How To Replace a Flat Package IC
Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a sol-
dering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
dering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
12.1.1. Preparation
• PbF (: Pb free) Solder
• Soldering Iron
• Soldering Iron
Tip Temperature of 700
°F ± 20°F (370°C ± 10°C)
Note: We recommend a 30 to 40 Watt soldering iron. An
expert may be able to use a 60 to 80 Watt iron where some-
one with less experience could overheat and damage the
PCB foil.
expert may be able to use a 60 to 80 Watt iron where some-
one with less experience could overheat and damage the
PCB foil.
• Flux
Recommended Flux: Specific Gravity
→ 0.82.
Type
→ RMA (lower residue, non-cleaning type)
Note: See About Lead Free Solder (PbF: Pb free) (P.3).
12.1.2. Removal Procedure
1. Put plenty of solder on the IC pins so that the pins can be
completely covered.
Note:
Note:
If the IC pins are not soldered enough, you may give
pressure to the P.C. board when cutting the pins with
a cutter.
pressure to the P.C. board when cutting the pins with
a cutter.
2. Make a few cuts into the joint (between the IC and its
pins) first and then cut off the pins thoroughly.
3. While the solder melts, remove it together with the IC
pins.
When you attach a new IC to the board, remove all solder
left on the land with some tools like a soldering wire. If some
solder is left at the joint on the board, the new IC will not be
left on the land with some tools like a soldering wire. If some
solder is left at the joint on the board, the new IC will not be
attached properly.
12.1.3. Procedure
1. Tack the flat pack IC to the PCB by temporarily soldering
two diagonally opposite pins in the correct positions on
the PCB.
the PCB.
Be certain each pin is located over the correct pad on the PCB.
2. Apply flux to all of the pins on the IC.
3. Being careful to not unsolder the tack points, slide the sol-
dering iron along the tips of the pins while feeding enough
solder to the tip so that it flows under the pins as they are
heated.
solder to the tip so that it flows under the pins as they are
heated.
12.1.4. Removing Solder From Between
Pins
1. Add a small amount of solder to the bridged pins.
2. With a hot iron, use a sweeping motion along the flat part
2. With a hot iron, use a sweeping motion along the flat part
of the pin to draw the solder from between the adjacent
pads.
pads.
54
KX-TCA275RU
12.2. Terminal Guide of the ICs Transistors and Diodes
12.2.1. Handset
12.2.2. Charger Unit
55
KX-TCA275RU
Memo
56
KX-TCA275RU
13 Schematic Diagram
13.1. Handset
KX-TCA275RU HANDSET SCHEMATIC DIAGRAM (1/2)
(2)
(3)
(4)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)(12)
(13)
(14)
(15)
(16)
(17)(18)
(19)(20)
(21)
(22)
(23)
(24)
(25)
(26)
(26)
(27)
(28)
(29)
(30)
(1)
D
F
E
C
B
A
H
G
4
6
2
1
ROW2
ROW0
COL1
ROW1
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
LCD_RST
LCD_CS
A0
WRT
READ
ROW1
ROW2
ROW3
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A0
A6
A5
A4
A3
A2
A1
LDO2_CTRL
CCR+
PON CHARGE CHARGE_STOP
LDO2_CTRL
LDO1_CTRL
LDO1_SNS
DB15
DB7
DB14
DB6
DB13
DB5
DB12
DB4
DB11
DB3
DB10
DB2
DB9
DB1
DB8
DB0
SYCL
SYDA
SYEN
TXDA
RXDA
RSSI
PSEL
PAON
RFCONT
RXDSG
SYRI
SRAM_CS
FLASH_CS
LCD_CS
READ
WRT
SRAM_UB
SRAM_LB
LCD_RST
VIB_CTRL
RCVAMP
KEY_BL
KEY_BL
PON
CCR+
CHARGE
CHARGE_STOP
FLASH_RST
WRT
A19
A8
A9
A10
A11
A12
A13
A14
A15
A16
DB15
DB7
DB14
DB6
DB13
DB5
DB12
DB4
DB11
DB3
DB10
DB2
DB9
DB1
DB8
DB0
FLASH_CS
A0
A1
A2
A3
A4
A5
A6
A7
A2
A3
A4
A5
A6
A7
A17
A18
A18
A20
DB3
READ
DB2
DB1
DB0
SRAM_CS
A0
A1
A2
A3
A4
A5
A6
A7
READ
SRAM_UB
SRAM_LB
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
A8
A9
A10
A11
A12
A13
A14
A15
A16
A13
A14
A15
A16
WRT
DB7
DB6
DB5
DB4
DB6
DB5
DB4
5V_CTRL
RLED
GLED
COL0
COL5
COL3
COL2
COL4
FLASH_RST
COL0
COL1
COL2
COL3
COL4
COL5
ROW0
RLED
GLED 5V_CTRL VIB_CTRL RCVAMP
ROW3
IC3
1
VDDIO1
2
VSS2
3
AD8
4
AD9
5
AD10
6
AD11
7
AD12
8
AD13
9
AD14
10
P3[7]/PD7
11
P3[1]/PD1
12
P3[5]/PD5
13
P3[4]/PD4
14
P3[3]/PD3
15
P3[2]/PD2
16
VDD16
17
VSS17
18
RFCLK
19
VDDRF
20
VSSRF
21
Xtal1
22
CAP
23
AVS
24
AVD
25
RSSI
26
RDI
27
CMPREF
28
TD0
29
AD15
30
AD16
31
AD17
32
AD18
33
AD19
34
AD20
35
AD21
36
AD22
37
AD23
38
LE
39 SO
40 SK
41 DAC/ADC2
42 P3[6]/PD6
43 RDN
44 WRN
45 M1/READY
46 SCLK
47 UTX/P0[0]
48 URX/P0[1]
49 JTIO/P0[2]
50 PCM_FSC1/P0[3]
51 PCM_FSC0/P0[4]
52 PCM_CLK/P0[5]
53 PCM_DOUT/P0[6]
54 PCM_DIN/P0[7]
55 VDDIO55
56 VSS56
57 DREQ0n/INT0n/P1[0]
58 DACK0n/INT1n/P1[1]
59 ACS1/DREQ1n/INT2n/P1[2]
60 ACS0
61 ACS2/DACK1n/INT3n/P1[3]
62 HOLDn/INT4n/P1[4]
63 VDDE/HOLDACKn/INT5n/P1[5]
64 BE1n
40 SK
41 DAC/ADC2
42 P3[6]/PD6
43 RDN
44 WRN
45 M1/READY
46 SCLK
47 UTX/P0[0]
48 URX/P0[1]
49 JTIO/P0[2]
50 PCM_FSC1/P0[3]
51 PCM_FSC0/P0[4]
52 PCM_CLK/P0[5]
53 PCM_DOUT/P0[6]
54 PCM_DIN/P0[7]
55 VDDIO55
56 VSS56
57 DREQ0n/INT0n/P1[0]
58 DACK0n/INT1n/P1[1]
59 ACS1/DREQ1n/INT2n/P1[2]
60 ACS0
61 ACS2/DACK1n/INT3n/P1[3]
62 HOLDn/INT4n/P1[4]
63 VDDE/HOLDACKn/INT5n/P1[5]
64 BE1n
65
BE0n
66
SCL2/P3[0]
67
SDA2
68
DAB0
69
DAB8
70
DAB1
71
DAB9
72
DAB2
73
DAB10
74
DAB3
75
DAB11
76
VSS76
77
VDD77
78
VDDIO78
79
P2[0]/PWM0/SPIDI
80
P2[1]/PWM1/SPICLK
81
P2[2]/ADC0/CLK100
82
P2[3]/ADC1
83
P2[4]/SCL1
84
P2[5]/SDA1
85
DAB4
86
DAB12
87
DAB5
88
DAB13
89
DAB6
90
DAB14
91
DAB7
92
DAB15
93
P2[7]/DC_CTRL/SPIDO
94
DC_I
95
P1[6]/PON/INT6
96
P1[7]/CHARGE/INT7
97
P2[6]/stop_charge
98
VBAT3/RINGING
99
DC_stab
100
DC_Sense
101
AVS_sense
102
ADC3
103
103:LDO1_Sense
104
LDO1_CTRL
105
LDO2_CTRL
106
VBAT2
107
VBAT1
108
AVS2
109
AVD2
110
LSR+/REF
111
LSR-/REF
112
LSR_HS/CIDIN-
113
VREF_HS/CIDOUT
114
MIC
115
VREF-
116
VBUF
117
AGND
118
MIC+
119
VREF+/CIDIN+
120
RSTn
121
AD0/EXT_MEMORY
122
AD1
123
AD2
124
AD3
125
AD4
126
AD5
127
AD6
128
AD7
CN5
1
2
3
2
3
SW12
8
SW33
R
SW41
Xfer/CLR
SW13
0
SW31
MSG
SW52
2
SW11
SOFT_A
SW53
7
SW22
9
SW02
5
SW21
1
SW03
*
SW42
3
SW23
#
SW01
TALK
SW40
SOFT_C
SW32
6
SW43
INT
CN2
LCD CONNECTOR
LCD CONNECTOR
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
Q8
X1
10.368MHz
1
2
3
4
RA5
0
1
2
3
4
5
6
7
8
RA1
0
1
2
3
4
5
6
7
8
RA4
0
1
2
3
4
5
6
7
8
RA3
0
1
2
3
4
5
6
7
8
RA2
0
1
2
3
4
5
6
7
8
D1.8V
R26
15k
15k
R28
5.6k
5.6k
D3.0V
R2
0
C3
Z0.1
R1
47
5.0V
Q1
E
C
B
C17
10p
C13
NC
C16 Z0.47
R6
10k
R11
10k
R12
10k
R7
1k
R9 1k
R8
1k
D3.0V
D3.0V
R27
100k
C11
Z0.1 16V
C15
Z0.1 16V
C18 Z0.1 16V
C20
Z0.1 16V
C9
Z0.1
Z0.1
16V
C8
Z0.1
16V
L3
4.7uH
C14
33p
R23
0
C19
KB0.22
BATT
R21
39
D14
R22
39
CN7
1
2
2
Q5
E
C
B
R17
47k
47k
R20
47k
R4
100k
100k
D3.0V
R3
100k
IC2
Flash ROM 48pin BGA
D6
A15
C6
A14
A6
A13
B6
A12
D5
A11
C5
A10
A5
A9
B5
A8
D4
A19
C4
A21
A4
WE
B4
RST
D3
A20
B3
WP/ACC
A3
RY/BY
C3
A18
B2
A17
A2
A7
C2
A6
D2
A5
B1
A4
A1
A3
C1
A2
D1
A1
E1
A0
F1
CE
H1
VSSH1
G1
OE
E2
DQ0
F2
DQ8
H2
DQ1
G2
DQ9
E3
DQ2
F3
DQ10
H3
DQ3
G3
DQ11
G4
VCC
H4
DQ4
F4
DQ12
E4
DQ5
G5
DQ13
H5
DQ6
F5
DQ14
E5
DQ7
G6
DQ15
H6
VSSH6
F6
NCF6
E6
A16
C12
Z0.1
L2
10uH
Q2
IP101
3.15A
R14
10k
C5
Z1u
C4
Z0.47
D13
R10
270k
270k
Q4
R19
NC
R13
NC
NC
D12
D11
R15
470
470
C6
K0.047u
Q3
E
C
B
R16
1k
C7
Z0.1
R18
100k
R5
0.22
L1
10uH
D3.0V
C2
Z0.1
D3.0V
C109
6.3V/100
6.3V/100
BATT
C121
6.3V/100
C120
6.3V/100
R73
1k
C1
Z0.1
C10
Z0.1
C108
6.3V/100
SW51
4
R25
120
120
R24
33
Q6
E
C
B
Q7
E
C
B
D3.0V
SW50
DOWN
SW30
PUSH
SW20
RIGHT
SW10
UP
SW00
LEFT
SW1
PWR
CK17
CK7
CK8
CK1
CK2
CK3
CK4
CK5
CK9
CK6
CN3
CHARGE+
CN4
CHARGE-
CN6_1
BATTERY+
CN6_2
BATTERY-
D1
C73
Z0.1
16V
C74
Z0.1
Z0.1
16V
IC1
SRAM 48pin BGA
B4
A4
B3
A3
A5
A2
A4
A1
A3
A0
B5
CE
B6
I/O0
C5
I/O1
C6
I/O2
D5
I/O3
D6
VccD6
E6
VssE6
E5
I/O4
F5
I/O5
F6
I/O6
G6
I/O7
G5
WE
E4
A16
F4
A15
F3
A14
G4
A13
G3
A12
A6
NCA6
D3
NCD3
E3
NCE3
G2
NCG2
H6
NCH6
H5
A11
H4
A10
H3
A9
H2
A8
H1
NCH1
B1
I/O8
C1
I/O9
C2
I/O10
D2
I/O11
E1
VccE1
D1
VssD1
E2
I/O12
F2
I/O13
F1
I/O14
G1
I/O15
A1
BLE
B2
BHE
A2
OE
D4
A7
C4
A6
C3
A5
INT
COL5
COL0
MSG
Xfer/CLR
SOFT_C
SOFT_B
R
TALK
SOFT_A
KEY MATRIX
PUSH
VIBRATOR
6
5
4
3
2
1
9
8
7
1
2
3
4
5
6
7
8
9
COL4
COL3
COL2
COL1
ROW3
ROW2
ROW1
ROW0
5
*
8
0
1
9
#
6
3
4
2
7
C
E
B
C
E
B
3
5
10.368MHz
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