Kenwood TH-K4AT Service Manual page 57

TH-K4AT/K4E
SCHEMATIC DIAGRAM
TX-RX UNIT (X57-675X-XX)(A/3)
MOD MOD
VOLIN VOLIN
5MS 5MS
5T
+B
NAR NAR
TO TO
QT/DQT
5R
5C
5MV
ENCA ENCA
ENCB ENCB
SIGIN
R170
5MS
2.02V 56k
T:0V
(D)
R:4.90V
TX LED BUSY LED
C331 R158
R165 T:73mV T:3.29V
470p 330k
R:3.39V R:110mV
820k
TX/BUSY
IC17
NJM2904V LED SW
R167 R168 R324 C349
CTCSS/DCS FILTER QT/DQT
180k 180k 47k 0.1u
C212 C290 C291
5T RXLED
0.012u 470p
470p
C195
T0 R141
10u10 1k R142 R145 R146
TONE
DTMF/BEEP
1k 4.7k 4.7k REM
VOXIN
R143
DCS BAL
27k VR6 MIC AMP
50k
IC16
NJM2904V
R163
T:4.95V
R330 R153 R154 C198 1 8 R:0V
V+ 470k
470 1k 4.7k C201 2 C208
1u 7
C193 R144 R147 1200p 3 6 82p
R155 R156
4.7u6.3 0 10k VR5 4 5 R164
50k Q27 100k 100k GND
ROTARY C202 47k
ENCODER MAX DEV 2SK1830
& W/N 270p C210 0.01u
VOL KNOB
ENCA 6
C209 470p
WIDE/NARROW
GND 5 CHANGEOVER SW
ENCB 4 C235 C236 REM
T:4.95V 5MV
VOLIN 3 0.01u 0.01u C220 R:0V C205 R161
C206
VOLOUT 2
4700p 0.047u 1.8k 0.018u
R190 R191
GND 1
47k 47k
HPF
CN1
IC5
D79,80 NJM2107F
LIMITER
C510 C358 C219 C221 3 4 R175 C225 R178
0.047u 0.047u 0.047u 0.01u 2 2.2k 1u 0 Q30
2SC4617(R)
1 5
R192 V+ VOX
DETECTION AMP
470
D80 D79
DA221 DA221
R194 MIC
RXD MUTE
J3 10k R195 R196 SW R183
PTT PTTE D22 L68
MIC Q29 1SS361 D27 D24
IM 100 10k 2SC4919 33k RB706F-40 MA742
MIC
R182 C228 C229
5MS R197
1k
100 0.1u 0.1u
MIC MUTE
IM CONTROL MIC ALC VOX DETECTION
J4 RECTIFICATION RECTIFICATION
SPG MIG MICM MICM
REM/TXD TXD
SP SPK RXD RXD
AFO R199 PTTE PTTE
R200 R201 IM IM
MIG MIG
1k 10k 4.7k
TXD TXD
SPM SPM
VOLOUT
D26 IC6 TA7368F
CN2 SP MUTE SW 3.23V
C246 DISCHARGE
1 SPK C246 Q56 CPH3417 L49 10 1
POUT 1 7.14V
SP 2
8 OHM SPG 100u10 SP MUTE 9 2
PW-GND VCC
REVERSE CURRENT SPEED UP 8 3
PRE-GND
PREVENTION D25 C252 R234
Q31 7 4 R207 R209 R223 C258
13.8V D32 2SK1830 PHASE VIN
L50 RB051L-40 MA2S111 100p 6 5 1k 100k 100k 18k 0.1u
J2 R203 NF RIPPLE
DC IN C253 R206
C270 C352 470k
15
470p 10u10 AF AMP
470p
D81
C338 RB521S-30 D81
Q31 DTMF/BEEP/1750
REVERSE CURRENT
1u C511 PREVENTION Q56 OPERATION SW F1
+B
REVERSE CURRENT
PREVENTION 470p D33 2.5A 5C/5R/5T AVR
13.57V Q37 7.12V
D30 R332 15 RB051L-40 F3 2SB1184(Q,R)
8V
RB521S-30 R210 12
C353 470p
13.40V 11.43V 0.5A Q37
Q33 R211
2SB1184(Q,R) 5M AF AMP/
LAMP AVR
BATTERY CHARGE SW 470k
TERMINAL C285 D33,35,36
Q38
REVERSE 2SC4617(R)
470p C284 CURRENT Q35 AVR
470p 4.93V CONSTANT-
D31 PREVENTION 2SK1830
VOLTAGE
DA221 Q36
D35 DC IN 2SJ347
CONSTANT- DETECTION
CURRENT 4.42V
CIRCUIT RB521S-30
C282 470p Q36 Q38
11.5V AVR 5C/5R/5T AVR
NI-MH Q37 OPERATION SW 8V
D36 TEMPERATURE
AFAMP
Q34 DETECTION 5M
2SK1830 RB521S-30 BTDET
C281 470p DCDET
Q33 OPERATION SW +B
BTEMP BTEMP
CHARGE CHARGE
MOD MOD
VOLIN VOLIN
5MS 5MS
5T 5T
+B +B
NAR NAR
TO TO
QT/DQT QT/DQT
5R 5R
5C 5C
5MV 5MV
ENCA ENCA TEMP
ENCB ENCB FINAL
SIGIN AFM
LCD (B38-0881-05) KAPC
DATA
CLOCK
SHIFT
PLLLD
PLLEN
SMV
SQV
5M
RXLED
TEMP
SMV
SQV
LAMP
5MS SW
TONE
DTMF/BEEP
REM R342 0
VOXIN
R283 R343 0
R282
0 0
BATT
COM0 C336 C332
C335 SEG15
0.1u 0.1u
COM1 0.1u
SEG14
COM2
CP31
COM3 3.9k
61 30
COM2 SEG13
62 SEG13
29
COM3 SEG12 SEG12
63 28
VSS SEG11 SEG11
64 27
SEG16 SEG16 SEG10 SEG10
65 26
SEG17 SEG17 SEG9 SEG9
66 25
SEG18 SEG18 SEG8 SEG8
67 24
SEG19 SEG19 SEG7 SEG7
68 23
SEG20 SEG20 SEG6 SEG6
69 22
SEG21 SEG21 SEG5 SEG5
70 21
SEG22 SEG22 SEG4 SEG4
71
20
SEG23 SEG23 SEG3 SEG3
72 19
SEG24 SEG24 SEG2 SEG2
73 18
NC SEG1 SEG1
74 17
SEG0
NC SEG0
75 MPU 16 5M
SEG25 SEG25 FINAL
76 15
IC8 5C SW
SEG26 SEG26 5C(SAVE)
77 90522BPFFG139 14 R318 PTTI
SEG27 SEG27 PTTI
78 13 1k
SEG28 SEG28 PTTE
79 12
SEG29 SEG29 TXD
80
11
SEG30 SEG30 RXD
81 10
SEG31 SEG31 SPM
82 9 R313
V0 AFM
83 8 3.3k 4.95V
V1
VCC
84 7
V2 KAPC
MICM 85 6 R310
BPF/APC
RXD V3 BPF/APC
PTTE 86 5 3.9k VOX
IM HST(VCC) VOX
MIG 87 4
EEPCS
TXD MD2 EEPCS
SPM 88 3
MD1 EEPDI EEPDI
89
2
MD0 DATA
90 1
RESET CLOCK
C359
0.1u C360
0.1u
5R SW
5T SW
INT0
RESET
PWR SW
C293
ON:4.91V 47p
R235 KOUT3
KOUT2
1k KOUT1
Q52 KOUT0
VUKEY
RN1107 TYPE
BEAT SHIFT SW KIN4
KIN3
KIN2
R285 KIN1
KIN0
RXD 0 RXD
PTTE PTTE
IM IM
MIG MIG
TXD TXD
SPM SPM
5C/5R/5T AVR 5C/5R/5T AVR
8V 8V
AFAMP
5M 5M
BTDET
DCDET
+B +B
BTEMP
CHARGE
MOD MOD
VOLIN VOLIN
5MS 5MS
5T 5T
+B +B
NAR NAR
TO TO
QT/DQT QT/DQT
5R 5R
5C 5C
5MV
TEMP TEMP
FINAL FINAL
AFM AFM
KAPC KAPC
DATA DATA
CLOCK CLOCK
SHIFT SHIFT
PLLLD PLLLD
PLLEN PLLEN
SMV SMV
SQV SQV
5M
C316
R237 100k
0.1u
EEPROM
1 8
CS VCC T:4.95V T:0V
5C SW 5.0V AVR R:0V R:4.90V
2 7 5MS SW 5T SW
SO HOLD
3 6 R238 1k Q57
WP SCK 4.95V Q41 4.83V T:4.99V
RN2105 RN2105
4 5 R236 1k R:0V
GND SI 5.03V Q55
CPH3317
IC15 5R/5MV
SW
AT25160N10SI27
C347
LAMP
470p
5MS SW C348
470p
R239 R241
BATT
1k 330k
4.79V
C311 R242 R243
0.1u 330k 330k
4
1 4.80V
VSS OUT
5.0V AVR
INT0 RESET
4.98V
2 3
R244 VDD CD
0
IC11
IC10
S-80844CNNBB85 S-80930CNNBG80
4.4V VOLTAGE DETECTION 3.3V VOLTAGE DETECTION
R248 R246 BPF/APC
3.9k 3.9k
L63
5M
5C SW
PTTI
D60
KEY TYPE DETECTION
D62-65 TX-RX UNIT
D61 MARKET CODE (X57-675X-XX)(C/3)
UHF TYPE DETECTION DETECTION
S7
TYPE
CN6 CN7 S70-0485-05 PTT
PTT
1 1
MONI
KIN4 2 2
* C374
KYO2 3 3
BPF/APC
KYO1 4 4 D48,49
VOX LAMP
LCD
BL 5 5 ILLUMINATION
EEPCS
GND 6 6 LED
EEPDI D48 D49
D69-72
B30-2237-05 B30-2237-05
REVERSE
PTT BOARD
CURRENT SET
PREVENTION
ON:6.98V
5R SW Q51
5T SW RN4902
INT0
RESET LCD LED SW
PWR SW
TX-RX UNIT
(X57-675X-XX)(B/3)
CN9
KOUT3
KOUT2 MIC1
KOUT1
KOUT0 CN8
VUKEY
TYPE
KIN4
KIN3
KIN2
KIN1
KIN0
1/F 2/VFO 3/MR F/CALL
IM MENU
MIG
4 5 6 VFO
D42-44,46,47
5C/5R/5T AVR
8V KEY
7 8 9 MR ILLUMINATION
Q50
5M LED
2SK1830
0 # CALL KEY LED SW
*
+B
ON:4.92V
10KEY BOARD
MOD
VOLIN
5MS
5T 5T
+B +B
NAR
TO
QT/DQT
5R
5C
TEMP TEMP
FINAL FINAL
AFM
KAPC KAPC
DATA
CLOCK
SHIFT
PLLLD
CN15 CN17
PLLEN
SMV
SQV
D1-4
VCO FREQUENCY CONTROL C19
C8 5p (B)
R11 150k
D1 8p
VCO Q5
LV Q2
HVC376B 2SC5488
Q1 2SC5488 C15 R346
L67 L1 D2 C2 L3 2SK508NV(52K) C13
12p 100
270n HVC376B 39p (G) 22n 0.5p
(B) RF AMP
RF AMP
FREQUENCY SHIFT
C4 D5 R7
470p HSC277 47k
D6
VCO MODULATION
Q3 Q4 4.63V
RIPPLE FILTER
2SK1830 3.76V 2SC4617(R)
VCO SHIFT
CONTROL SW
SHIFT
SPEED UP
TEMP
FINAL
L53 C24 R19
R31 R30 12n
470p 120k
2.2k C37 C22
1k
470p
4p C20
C38
5p
Q6
0.01u 2SC5488
RF AMP
C50 22p
4.63V
D16
PLL LOCK DETECTION
R35 120k
PLL IC
FREQ D16 R32 IC1
BPF/APC VR1 LMX2316TMX
MA2S111 1k
R37 27k
C40 0.1u
100k
1.51V 4.81V
R36 10
VC VCC
KAPC
12.8MHz
L64 C51
GND OUTPUT
4.7u 22p
CP2
X1 3.9k
L77-1931-05 PLLEN
DATA
CLOCK
PLLLD
CF1
L72-0968-05
2nd L.O. R131 330k
450kHz 4.77V
C166 C187
T:0V
R:4.62V 0.51V
0.01u 2p
5R R132
2.2k
Q23
C173 KTC4082
TRIPLER
180p
SQ FILTER
C174
5R
180p
BPF/APC
FM IC
IC3
TA31136FN
R116
4.81V
120k
AF FILTER R124 C190
C169 C170 R119 R122 R123 3.3k
Q21
2SC4617(R) 0.01u R134
0.068u 0.068u 1.8k 2.7k 1.8k 390k
C167 R128 C180 0.72V
IF AMP
R117 C191
0.1u 3.3k 120p Q24
2SC5488
2.7k 0.01u
Q20 (D)
2SK1830
Q22 CD1
AF MUTE SW RN2105 450kHz
R120
2.7k
WIDE/NARROW
CHANGEOVER SW
W:115mV
N:4.94V
5R 5R
BPF/APC
T:4.31V T:4.86V 10.37V
5T
R:0V R:0V C364 C75 C329 L15
+B
C65 10p C68 R271 C326 4.7n
RF AMP 1.98V 18p 470p 12p
12
10p 470p C363 Q11
RF SW Q9 2SK2596
2SC5488
D8 R347 DRIVE 10p
1.43V AMP DRIVE
AMP
HSC277 150 Q10
2.03V
2SC4926YD
D9
HSC277
RF SW R34
3.3k
Q15
2SC4617(R)
VOLTAGE
4.91V
Q10 OPERATION SW DROP
5T 5T
VGG
VDD
10.56V
POWER Q12 L17 C89 ANTENNA SW
AMP 2SK3476
D10
2.5n 33p L20 L21 L22 L30
HVC131
T:0V 4T 4T 4T 4T
C94 ANT
R:0V CN10 D11 470p C96 1p C98 2p C100 2p
HVC131 (B) (B) (B)
ANTENNA SW
R61 270
Q12 GATE
VOLTAGE SW
R62 270
Q58 R289
2SK1830
0
2.30V OVER INPUT
PROTECTION
(HIGH POWER)
D12,13
VGG ANTENNA SW
5T 5T
TEMP
FINAL
R76 150k
(D)
APC
R74 100k C108 DIFFERENTIAL
AMP
(D) 100p
IC2 NJM2904V
APC OUTPUT SW
1 8
AOUT V+ Q14
RN4902
2 7 R85 560
A-IN BOUT TEMP COMPENSATION
3 6 R81 390k
R75 A+IN B-IN
4 5 C112 470p
100k (D) GND B+IN
Q13
2SK1830 R83
R79 APC D15
5T C110 470p
56k APC OUTPUT
APC 150k (D) C356 0.01u
VOLTAGE LIMITTER
CIRCUIT
OPERATION +B
5R SWITCH
KAPC KAPC(APC KILL)
D14
REVERSE CURRENT PREVENTION
L28 L29 C137
12n
15n 7p
C136
5p
38.85MHz
1st IF
XF1 1st MIXER D18,19 D20,21
L71-0619-05 4.56V RX BPF TUNING RX BPF TUNING
R90 C128 R88 L27 Q16 3.10V
3SK318 C146 C159 3p C165 3p
2.80V C140 4.56V 3.14V
330 0.01u 330 680n C156
C142 4p (B) 4p (B) L36 470p (B) (B)
4.30V
56n
470p
Q17
3SK318 C162 R353 R352
RX 1st AMP 470p 0 0
5R
5R 5R
BPF/APC
X57-675X-XX D44 D47 D60 D62 D63 R230 C374 C512
2-71 TH-K4E E NO NO MA2S111 MA2S111 NO NO 100p 100p
0-21 TH-K4AT M2 B30-2205-05 B30-2205-05 NO NO MA2S111 220 NO NO
Reference voltage value are measured when the power supply voltage is 13.8V(DC IN).
Note : The components marked with a
dot ( ) are parts of layer1.