Panasonic KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT Service Manual ▷ View online
+2.7V
IC10
1
A0
2
A1
3
A2
4
VSS
5
SDA
6
SCL
7
WP
8
VCC
R39
10K
R40
22K
TALK
INT
8
5
MAIL
7
SP
*
3
6
9
CLEAR
R
#
0
2
1
4
SOFT_A
MIC
R37
33R
R38
33R
C10
100n
R29
2.2K
IC2
1
CD
2
FC2
3
FC1
4
VIN
5
VO1
6
VCC
7
GND
8
VO2
R34
180K
R35
27K
C14
100n
C13
100n
C15
1u
C16
100n
+4V
C38
470P
R36
68K
C12
1u
N.M.
C43
N.M.
C41
10u
C42
CN4
1
5
4
3
2
+2.7V
C46
100n
C48
0.047u
R52
18K
C45
100n
C49
100n
C47
100n
R51
1M
X2
+2.7V
+4V
IC3
5 RSSI
6 VCC_OC
7 GND
8 SYCL
9 SYDA
6 VCC_OC
7 GND
8 SYCL
9 SYDA
10 SYEN
11 GND
12
RXDSG
13
SYRI
14
GND
15
GND
16
GND
17
GND
18
GND
19
GND
20
RXDA
21
GND
22
GND
23
GND
24
PSEL
25
PAON
26
GND
27
VCC_PA
28
GND
29
GND
30
GND
31
GND
32
GND
33
RF1
34
GND
GND
1
GND
2
GND
3
TXDA
4
A201
R55
10K
10K
L2
4.7uH
C56
68p
C54
33p
C55
100n
IC4
1I
R
Q
2
IFSEL
3
SYNC
4
AVDD
5
TESTA
6
TESTA
7
TESTA
8
VREFL
9
VREFR
10
AOUTL
11
AOUTT
12
AGND
13
PTESTO2
14
ILE
15
CS
16
RD
17
WR
18
D7/TESTO
19
D5/TESTO
20
D5/ERQ
21
D4/SRQ
22
D3/ARQ
23
D2/SCLK
25
D1/SDOUT
26
D0/SDIN
27
VDDIO
28
DVDD
29
PTESTIN1
30
CLOCK
31
P0
32
P1
33
P2
34
P3
35
P4
36
PTESTO1
37 VIB
38 DrvGND
39 PANEL
40 PWM0
41 PWM1
42 PWM2
43 PWM3
44 DVDD
45 DGND
46 TEST1
47 PTESTIN2
48 RESET
38 DrvGND
39 PANEL
40 PWM0
41 PWM1
42 PWM2
43 PWM3
44 DVDD
45 DGND
46 TEST1
47 PTESTIN2
48 RESET
24
DGND
C44
1u
C60
4.7u
C61
B 1u
R58
2.2
C62
4.7u
C63
5
600p
C64
2p
C65
2p
C66
2p
SP_TEST2
SP_TEST1
REV_TEST1
REV_TEST2
SW1
COM
C
P
B
A
D
P
B
A
D
R62
10k
C69
2p
Q8
R65
N.M.
C70
100n
R66
10k
R50
100R
IC5
1
1A
2
3Y
3
2A
4
GND
5
2Y
6
3A
7
1Y
8
VCC
TP15
R71
100k
TP1
TP2
TP3
TP4
TP5
TP6
CLK
TP8
TP9
D5
C67
10p
(10-05)
C76
N.M.
C78
N.M.
C79
N.M.
D4
L
C80 2.2u
21-25
R74
0R
C83
N.M.
TP13
R75
0R
N.M.
C85
N.M.
C84
C81
2
p
C82
2p
D8
C86
1u
R77
680R
R76
22K
10P
C17
10P
C89
10P
C87
10P
C92
10R
R80
C95
N.M.
(2125)
C100
1u
10P
C77
10P
C75
R90
10K
C101
100n
COL4
COL5
COL3
COL2
COL1
P0
PANEL
PWM1
ROW3
COL0
TXDA
SYCL
SYDA
SYEN
SYDA
SYEN
RXDSG
RXDA
PSEL
P2
P3
SYRI
PAON
RSSI
ROW 2
ROW1
ROW0
HEADSET JACK
DOWN
RIGHT
LEFT
UP
PUSH
KX-TCA154RUM/RUT: SCHEMATIC DIAGRAM (CORDLESS HANDSET)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(14)
(15)
(16)
(17)
(18)
(19)
(19)
(20)
(21)
3.9V
0V
Speaker
Receiver
MIDI signal
0V (without Headset)
1V (with Headset)
1V (with Headset)
0V
2.7V
0V
2.7V
0V
2.7V
2.7V
2.7V
0V
TX-DATA
RX-DATA
4.2V
0V
2.7V
121
KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
40 SCHEMATIC DIAGRAM (CHARGER UNIT)
TP3
R2
27
TP4
D1
2
1
J1
pinL
DC_PLUG
22
Charge_minus
TP1
TP2
R1
Charge_plus
SCHEMATIC DIAGRAM (CHARGER UNIT)
122
KX-TCD540RUM / KX-TCA154RUM / KX-TCD540RUT / KX-TCA154RUT
41 CIRCUIT BOARD (BASE UNIT)
41.1. Main
41.1.1. Component View
X1
CN2
CN1
SA1
R81
R82
L2
R17
R31
R107
R106
R16
C81
C12
C13
C272
RLY1
C80
D207
D206
D212
D208
R79
R110
R102
Q1
D2
D3
Q8
C18
R25
C19
Q5
C40
C108
C109
C211
IC14
C212
C309
C313
C301
R288
R286
C305
C314
C302
R271
C269
C268
C300
C294
C284
C255
R251
IC15
C293
R302
C276
C315
C258
C289
C287
C267
C288
C291
R282
1
D209
R49
R12
R15
R299
R33
R278
C9
R29
C23
C5
E
C
B
C124
R80
C79
C11
C78
R76
C77
R77
C68
IC3
C45
C110
C17
R22
1
SA2
C318
C307
C306
C114
C72
C82
C105
C67
C66
C104
C73
C100
C324
C319
C321
IC1
R280
R56
R57
R275 R105
48
25
IC7
IC13
IC2
IC12
C53
D214
J2
J4
J7
J5
J8
J6
J3
J1
64
65
L8
L9
C1
C2
C3
R60
C57
R59
C55
R113
R112
R91
C59
C64
C86
C84
C83
C63
RFM1
L1
Q13
IC6
IC8
C58
C71
C85
R92
C320
C323
C322
C62
C312
C311
DA1
L3
5
7
11
1
1
28
22
ANT2
1
1
C42
C37
C34
C43
C39
R277
1
1
1
10
11
20
1
10
11
20
C44
C48
C15
C14
C35
C76
C221
C270
R223 C225
D205
D203
RA3
RA1
RA4
D201
D204
D202
D202
D200
C223
R220
R221
R221
R279
R293
R266
R231
R292
C224
R222
C226
C271
C210
C232
24
C308
RA2
RA5
C273
TP201
TP205
TP204
TP202
TP203
CN9
C310
R300
R301
C283
C282
C286
D217
C227
D11
C220
C317
7
5
4
1
1
C41
C47
C46
R43
C36
R48
R47
R42
R44
R54
C50
C52
R52
R52
R50
C8
R13
R263
R262
R262
R261
R14
C6
C325
D210
D211
C285
R259
R260
R51
IC10
D213
R75
R103
R72
R71
R71
R23
R26
R39
R85
R24
128
C28
R111
D215
C316
R301
C26
C24
R78
Q12
TP31
R28
C115
D10
R46
R45
R53
C25
C7
C20
C49
Q3
Q2
C21
C33
103
102
C10
C31
Q7
Q6
B C E
Q4
Q9
R37
R35
R34
R36
D4
R70
R68
R69
R67
R68
R69
R67
C75
R74
R73
C74
C65
R273
R41
R11
R10
R272
R38
C32
C38
C101 C102
R40
R296
R297
TP110
TP61
TP60
C241
C240
C231
R230
R230
C274
R264
R265
R281
C266
C230
C103
D9
D8
D8
R276
24
38
39
44
23
R61
R108
R109
18
4
C4
L6
L7
D1
PbF
R295
D7
TP104
R84
C277
C279
R55
R64
C278
C295
R283
C233
R283
C233
C292
C299
C27
R32
R32
R27
C22
C22
R291
C254
C119
C119
C303
D216
R290
R287
C304
R285
C297
C298
R289
C296
R284
C275
C290
R284
C275
C290
R86
R294
R88
R87
KX-TCD540RUM/RUT CIRCUIT BOARD (BASE UNIT) Main (Component View)
IC14
(4.0V)
OUT
IC14
(5.5V)
IN
Q3
Collector
(1.8 V)
Q2
Collector
(1.2 V)
Bell Sound
(BBIC: 110)
RESET
(BBIC: 120)
BBIC:21
(10.368MHz)
+4V
(RFM1-27)
IC1
(5.5 V)
IN
IC1
(4.0V)
OUT
+4V
(RFM1-6)
RFM1
(RF module)
IC2
(BBIC)
K
X
-T
C
D
5
40R
U
M
/
/
K
X-
T
T
C
A
154R
U
M
/
/
K
X-
T
T
C
D
540
R
U
T
/
/
K
X-
T
T
C
A
154R
U
T
123
41.1.2. Flow Solder Side View
KX-TCD540RUM/RUT CIRCUIT BOARD (BASE UNIT) Main (Flow Solder Side View)
PbF
TP14
ANT1
TP49
TP5
TP4
4 2
1
5
6
TP9
TP222
TP7
TP19
TP21
TP20
TP29
TP24
TP22
TP15
TP3
TP200
TP100
TP108
TP109
HSSP
SP
URX
(Red)
(Red)
UTX
(Yellow)
GND
(Black)
MIC1
TP101
TP102
TP103
TP223
TP224
MIC
TP14
(4.0V)
TP49
(10.368MHz)
TP22
(3.2V)
TP15
(1.8V)
TP3
(4.0V)
to JIG
K
X
-T
C
D
5
40R
U
M
/
/
K
X-
T
T
C
A
154R
U
M
/
/
K
X-
T
T
C
D
540
R
U
T
/
/
K
X-
T
T
C
A
154R
U
T
124
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