Panasonic KX-DT321UA Service Manual ▷ View online
25
KX-DT321UA/KX-DT321UA-B
9.2.
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.
9.2.1.
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).
9.2.2.
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
attached properly.
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.
9.2.3.
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.
9.2.4.
Removing Solder From Between
Pins
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.
26
KX-DT321UA/KX-DT321UA-B
10 Schematic Diagram
10.1. Main Board
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(9)
(12)
(13)
(11)
(10)
(8)
1/4
2/4
3/4
4/4
KX-DT321
UA
/KX-DT321
UA
-B :
MAIN BO
ARD (1/4)
Vref
CC
DET
SCLK
SCLK
DATA
DATA
CSN
SP_CSN
A3.3V
C513
K0.1
C511
K0.1
C508
K0.1
C507
1200P
A3.3V
L52
C510
0.015
C515
K0.1
C514
180P
AG
AG
IC5
1
A0
2
A1
3
A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
DG
D3.3V
DG
Q52
E
C
B
C521
K0.1
AG
C501
NC
Q51
E
C
B
AG
C527
0.015
C541
NC
AG
AG
AG
L53
AG
A3.3V
C539
6800P
C621
390P
AG
C537
100P
C504
100P
C535
820P
C609
NC
IC4
1
PLLCAP
2
AVSS
3
SPON
4
SPOP
5
DVDD
6
DVSS
7
FS
8
DX
9
BCLK
10
DR
11
DATA
12
SCLK
13
CSN
14
TEST
15
AVDD
16
MIC2
17
MIC1
18
MIC3
19
HANDT3
20
HANDT1
21
HANDT2
22
VREF
23
RAGND
24
DAOUT
25
HANDI
26
HANDR
27
RAI
28
RAO
29
SPI
30
TONE
IC9
1
COM
2
INH
3
GND3
4
GND4
5
A
6
Y1
7
Y0
8
VCC
A3.3V
AG
IC3
1
BCLK
2F
S
3
RIN
4
TIN
5
ROUT
6
TOUT
7
VDD
8
VSS
9
RXON
10
TXON
11
DATA
12
TEST2
13
SCLK
14
CSN
15
TEST1
16
RST
AG
AG
AG
DG
DG
DG
AG
AG
DG
CN6
NC
1
2
1
2
Q601
E
C
B
D3.3V
MIC3
SPP
AG2
SPN
MIC1
SP1
SP2
MIC2
JK3
1
2
3
4
JK4
1
2
3
4
5
C608
NC
AG
AG
C525
10
L51
0
L54
0
C503 Z0.1
C517
Z0.1
C534
Z0.1
C536
Z0.1
C516
Z1
C518
Z1
C520
Z1
C519
Z1
C540
K1
AG
A3.3V
IC22
NC
1
2
3
4
6
5
7
8
C529
NC
C530
NC
AG
C531
NC
HD/HD_AG
HD_MIC
HD_SP
HS_MIC
HS_SP
A3.3V
AG
C502
0.047
C506
0.033
C538
K0.1
D3.3V
DG
AG1
CN3
1
2
3
CN3
4
5
CN4
5
4
3
CN4
2
1
IC11
1
VOUT1
2
VIN1
3
Bypass
4
GND
5
SHUTDOWN
6
VIN2
7
VOUT2
8
VDD
CN1
1
2
CN2
1
2
RA4
47k
1
2
3
4
5
6
7
8
6
7
8
AG
DG
AG
DG
AG
DG
D3.3V
C545
NC
C546
NC
C547
NC
C548
NC
DG
C526
100
6.3V
C552
K0.01
C553
K0.01
C532
K0.01
C500
K0.01
C533
1000P
C556
1000P
AG
C554 100P
C555
1000P
C557
NC
AG
DG
C542
1000P
C528
1000P
C543
1000P
C544
1000P
C558
NC
C559
NC
C512
K0.01
C509
1000P
R522
120K
R506
2.2K
R524
47K
R604
560
R605
6.8K
R514
0
R606
4.7K
R533
NC
R504
10K
R534
0
R510
56K
R500
470
R502
1.2K
R521
33K
R520
1K
R526
1
50k
R529
220
R509
27K
R530
NC
R523
47K
R513
0
R607
1.8K
R511
22K
R527
180
R525
22K
R507
82K
R532
NC
R501
2.2K
R512
220K
R503
56K
R528
2.2K
R531NC
SP
MIC
IC3
IC4
DG/AG
27
KX-DT321UA/KX-DT321UA-B
(j)
(k)
(m)
(n)
(p)
(q)
(r)
(s)
(t)
(u)
(v)
(w)
(x)
(y)
(z)
(A)
(B)
(C)
(D)
(E)
(F)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(9)
(12)
(13)
(11)
(10)
(8)
1/4
2/4
3/4
4/4
KX-DT321
UA
/KX-DT321
UA
-B :
MAIN BO
ARD (2/4)
KIN[3]
KIN[1]
KOUT[0]
INTN
WEN
KOUT[2]
KIN[4]
KIN[2]
KIN[0]
REN
KOUT[1]
KOUT[3]
KIN[0]
KIN[1]
KIN[2]
KIN[3]
KIN[4]
KIN[5]
KIN[6]
KOUT[1]
KOUT[2]
KIN[5]
KIN[6]
KIN[7]
CSN
SCLK
SP_CSN
DATA
LCD_DATA
LCD_SCK
LCD_STB
KOUT[0]
KOUT[3]
KIN[7]
D3.3V
D3.3V
D3.3V
D63
D3.3V
DG
DG
DG
IC8
5
3
1
IC8
2
4
D5V
DG
IC10
9
10
8
IC10
1
2
3
IC10
12
13
11
D5V
DG
DG
IC10
4
5
6
D5V
DG
D5V
DG
DG
SW13
CO4
SW1
CO7
SW29
SP
SW9
CO5
SW25
CO1
SW5
CO6
SW17
CO3
SW2
CO8
SW21
CO2
SW15
2
SW32
REDIAL
SW8
V/UP
SW31
HOLD
SW28
*
SW18
6
SW20
4
SW26
#
SW16
1
SW22
9
SW24
7
SW6
PRO
SW11
AT/MT
SW19
5
SW27
0
SW30
FLASH
SW3
MES
SW14
3
SW4
V/DWN
SW23
8
SW12
INCOM
SW33
SP
SW34
>/RIGHT
SW35
</LEFT
DG
DG
DG
DG
DG
DG
DG
DG
D62
D61
IC10
14
7
C602
NC
RA2
47k
1
2
3
4
2
3
4
5
6
7
8
C600
Z0.1
C601
Z0.1
C603
Z0.1
C604
Z0.1
C605
Z0.1
C606
Z0.1
C607
Z0.1
C623
Z0.1
D5V
SW36
Hook_SW
CN5
1
VSS
2
Vdd
3
V0
4
STB/RS
5
SCK/E
6
DATA/RW
G1
H_SW
SW7
AT/ST
SW10
TRANS
R623
2.2K
R608
180
R619
0
R621
0
R609
180
R620
0
R601
47K
R622
18K
R602
47K
R610
NC
R600
1.8K
R624
220
R611
47K
IC6
1
X1
2
X2
3
VSS
4
OSC2
5
OSC1
6
TEST
7
VCC
8
RES
9
P20
10
SCK1
11
SI1
12
SO1
13
SCK3
14
RXD
15
TXD
16
P27
17
P17
18
IRQ2
19
IRQ1
20
P14
21
P13
22
P12
23
P11
24
P10
25
PA3
26
PA2
27
PA1
28
P50
29
P51
30
P52
31
P53
32
P54
33
P55
34
P56
35
P57
36
P60
37
P61
38
P62
39
P63
40
P64
41
P65
42
P66
43
P67
44
P70
45
P71
46
P72
47
P73
48
P74
49
P75
50
P76
51
P77
52
P80
53
P81
54
P82
55
P83
56
P84
57
P85
58
P86
59
P87
60
TONED
61
VTref
62
AN7
63
AN6
64
CVCC
TO LCD
28
KX-DT321UA/KX-DT321UA-B
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(14)
(15)
(16)
1/4
2/4
3/4
4/4
KX-DT321
UA
/KX-DT321
UA
-B :
MAIN BO
ARD (3/4)
L4
L3
C103
1
000P
DG
D3.3V
D3.3V
C102
1000P
DG
DG
L2
D3.3V
DG
D3.3V
D3.3V
C405
12P
D3.3V
D3.3V
Q1
UMS1N
1
2
3
4
5
Q5
UMX1N
1
2
3
5
4
6
Q6
E
C
B
DG
D3.3V
Q3
UMS1N
1
2
3
4
5
DG
L1
D3.3V
C106
1000P
C105
1000P
IC2
PVRH
37
PDX1
39
PDX0
38
DVRL
30
OP1/DRE
28
DDX0
33
DDX1
34
DVRH
32
DDR
31
PVRL
35
PDR
36
20
OSR
21
OSX
22
OEP0
25
OCK
1
VDD1
24
VDD24
56
VDD56
7
GND7
17
GND17
46
GND46
49
GND49
2
CSN
48
OSO
47
OSI
44
VDD44
23
GND23
26
OSYNC
19
OEP1/PN9/CK512K
H
L
H_DXDP
L_DXDP
DG
DG
DG
DG
DG
DG
DG
DG
PN9
C118
Z1/50V
C111
Z1
C109
Z1
C115
Z1
C116
Z1
C117
Z1
D3.3V
DA1
1
2
3
D3.3V
DA2
1
2
3
RA1
1k
1
2
3
4
56
78
C104
Z0.1
C114
Z0.1
C400
Z0.1
C401
Z0.1
C402
Z0.1
C403
Z0.1
C119
Z1/50V
DG
C101
Z0.1
C100
Z0.1
DG
C523
Z0.1
C522
Z0.1
JK2
1H
2T
3R
4L
JK1
1H
2T
3R
4L
C11
NC
C12
NC
DG
DG
D1
1
2
3
4
C10
NC
DG
C549
NC
C551
NC
C550
NC
D5V
DG
C110
1000P
C112
1000P
C120
1000P
C113
1000P
C404
18P
X1
16.384MHz
R138
27
R517
47K
R111
1.8K
R119
8.2K
R518
1K
R100
1.8K
R109
22
R106
120
R400
820
R516
47K
R107
1.8K
R103
12K
R132
22
R402
47K
R115
1.2K
R139
5.6
R108
22
R104
1.8K
R105
1.2K
R131
270
R133
180
R401
1M
R101
8.2K
R406
47K
R110
1.8K
R130
2
2
R102
5.6K
R117
1.5K
T1
1
2
4
5
6
7
9
10
T2
1
2
4
5
6
7
9
10
TO DPT
TO PBX
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