Kenwood 144MHz FM TRANSCEIVER K2E Service Manual page 57

TH-K2AT/K2E/K2ET
SCHEMATIC DIAGRAM
TX-RX UNIT (X57-674X-XX)(A/3)
MOD MOD
VOLIN VOLIN
5MS 5MS
5T
NAR NAR
TO TO
QT/DQT QT/DQT
5R
5C
ENCA ENCA
ENCB ENCB
5MS
T:0V 2.08V R170
R:4.89V 47k
(D)
TX LED BUSY LED
CTCSS/DCS/WX FILTER
IC17 R157
NJM2902V
330k
1 14
2 13 R158 T:73mV T:3.29V
R:3.39V R:110mV
* R264 3 12 R165 330k
C331 4 11 820k
V+ GND TX/BUSY
WX1050Hz 1000p 5 10 R167 LED SW
* C350 R257 * C320 6 180k
* 9 R168 R324 C349
7 8
C212 180k 47k 0.1u C290 C291
RXLED
* C321 0.012u 1000p 1000p
* R344 NOAA
* Q59
5MV
WX DETECTION AMP SIGIN
C195
T0 R141 TONE
REM
10u10 18k T:4.92V
VR6 R145 R146 VOXIN
R:0V 5T
100k 4.7k 18k
MIC AMP
DCS BAL
R143 IC16
NJM2904V R163
470
R330 R153 C198 1 8
V+ 560k
1k
470 1u C201 2 7 C208
C193 R144 R147 1200p 3 6 82p
R156
R155
4.7u6.3 0 470 VR5 4 5 R164
50k Q27 100k 100k GND
ROTARY C202 10k(D)
ENCODER MAX DEV 2SK1830
& W/N 270p C210 0.01u
VOL KNOB
ENCA 6
C209 1000p
WIDE/NARROW T:4.96V
GND 5 CHANGEOVER SW R:0V
ENCB 4 C235 C236 REM
5MV 5MV
VOLIN 3 0.01u 0.01u C205
C220 R161 C206
VOLOUT 2 4700p 0.047u 1k 0.015u
R190 R191
GND 1
47k 47k
HPF
CN1
IC5
D74,79
NJM2107F
LIMITER
C505 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
V+ VOX
R192
DETECTION AMP
470
D79 D74
DA221 DA221
R194 MIC
RXD MUTE
J3 10k R195 R196 SW
PTT PTTE R183
MIC Q29
IM 100 10k 2SC4919 33k D27 D24 D27
MIC
R182 C228 C229 MIC ALC
5MS R197
1k RECTIFICATION
100 0.1u 0.1u
D24
D22
1SS361 RB706F-40 MA742 VOX DETECTION
IM RECTIFICATION
J4 MIC MUTE
SPG MIG MICM MICM
REM/TXD TXD CONTROL
SP SPK RXD
PTTE
AFO R199 R200 R201 IM
MIG
1k 10k 4.7k
TXD
SPM
VOLOUT
D26 IC6
CN2 SP MUTE SW 3.23V TA7368F
C246 DISCHARGE
1 C246 Q56 CPH3417 L49 10 1
SPK POUT 1 7.07V
SP
8 OHM 2 SPG 100u10 9 2
SP MUTE PW-GND VCC
SPEED UP 8 3
REVERSE CURRENT PRE-GND
PREVENTION D25 C252
Q31 7 4 R207 R209 R223 R224 C258 DTMF/BEEP
13.8V D32 2SK1830 PHASE VIN
MA2S111 100p 6 5 1k 100k 220k 18k 0.1u
J2 L50 RB051L-40
R203 NF RIPPLE
DC IN C253 R206
C352 470k
C270 15
1000p 10u10 AF AMP
1000p
D80
C338 RB521S-30 D80
Q31 DTMF/BEEP/1750/W-ALT
REVERSE CURRENT
1u C506 PREVENTION Q56 OPERATION SW F1
+B
REVERSE CURRENT
PREVENTION 1000p D33 2.5A 5C/5R/5T AVR
13.58V Q37 7.07V
D30 R332 15 F3
RB051L-40 2SB1184(Q,R) 8V
RB521S-30 R210 12
C353 1000p
13.43V 11.45V 0.5A Q37
Q33 R211
2SB1184(Q,R) AF AMP/
LAMP AVR
BATTERY 470k
TERMINAL CHARGE SW C284
D33,35,36 Q38
REVERSE 2SC4617(R)
C285 1000p AVR
1000p CURRENT Q35 4.80V CONSTANT-
D31 PREVENTION 2SK1830
VOLTAGE
DA221 Q36 RXD
PTTE
D35 DC IN 2SJ347 IM
CONSTANT- DETECTION MIG
CURRENT 4.31V
CIRCUIT RB521S-30 TXD
11.5V AVR C282 1000p SPM
Q38 5C/5R/5T AVR
Q36 Q37 OPERATION SW 8V
D36 NI-MH
AFAMP
Q34 TEMPERATURE 5M
2SK1830 RB521S-30 DETECTION BTDET
C281 1000p
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
ENCA ENCA TEMP
ENCB ENCB FINAL
AFM
LCD (B38-0881-05) KAPC
DATA
CLOCK
SHIFT
PLLLD
PLLEN
SMV
SQV
5MV
5M
RXLED
NOAA
TEMP
SMV
SQV
5MV 5MV
SIGIN 5MS SW
LAMP
TONE
REM R342 0
VOXIN 5C SW
R282 R283 R343 0 VOX
5R SW
0 0 5T SW
BATT
COM0 C336 C332
C335 SEG15
0.1u 0.1u
COM1 0.1u
SEG14
COM2
CP31
COM3 3.9k
61 30
COM2 SEG13
SEG13
62 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
NC SEG0 SEG0
75 MPU 16
SEG25 SEG25 FINAL
76 15
IC8 5M
SEG26 SEG26 5C(SAVE)
77 90522BPFFG139 14 R318
SEG27 SEG27 PTTI PTTI
78
13 1k
SEG28 SEG28 PTTE
79 12
SEG29 SEG29 TXD
80 11
SEG30 SEG30 RXD
81 10 4.83V
SEG31 SEG31
SPM
82 9 R313
V0 AFM
83 8 3.3k
V1 VCC
84 7
V2 KAPC
MICM 85 6
R310 BPF/APC
V3 BPF/APC
86 5 3.9k
HST(VCC) VOX
87
4 EEPCS
MD2 EEPCS
88 3
MD1 EEPDI EEPDI
89 2
MD0 DATA
90 1
RESET CLOCK
C359
0.1u C360
0.1u
DTMF/BEEP
INT0
PWR SW
RESET
C293
ON:4.76V
+B 47p
R235
KOUT3
1k KOUT2
KOUT1
Q52 KOUT0
RN1107
VUKEY
BEAT SHIFT SW TYPE
KIN4
R285 KIN3
KIN2
0 KIN1
KIN0
RXD
PTTE
IM IM
MIG MIG
TXD
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
TEMP TEMP
FINAL FINAL
AFM AFM
KAPC KAPC
DATA DATA
CLOCK CLOCK
SHIFT SHIFT
PLLLD PLLLD
PLLEN PLLEN
SMV SMV
SQV SQV
5MV
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
SO HOLD 5T SW
3 6
R238 1k 4.83V Q41 4.66V Q57 T:4.95V
WP SCK RN2105 RN2105
4 5 R236 1k R:0V
GND SI 5.01V
Q55
CPH3317
IC15 5R/5MV
SW
AT25160N10SI27
C347
5MS SW 1000p
LAMP C348
1000p
5C SW
VOX
5R SW
5T SW
BATT R239 R241
1k 330k
4.68V 4.69V
C311 R242
R243
0.1u 330k 330k
4
1
VSS OUT
5.0V AVR
INT0 RESET
4.92V
2 3
R244 VDD CD
0
IC10 IC11
S-80844CNNBB85 S-80930CNNBG80
4.4V VOLTAGE DETECTION 3.3V VOLTAGE DETECTION
R248 R246
BPF/APC
3.9k 3.9k
L63
5M
PTTI
D60 D62-65
TX-RX UNIT
KEY TYPE MARKET CODE
(X57-674X-XX)(C/3)
DETECTION DETECTION
S7
TYPE
CN6 CN7 S70-0485-05 PTT
PTT 1 1
KIN4 2 2 MONI
KYO2 3 3 D48,49
BPF/APC
KYO1 4 4 LCD
LAMP
ILLUMINATION
BL 5 5 LED
EEPCS
GND 6
6 D48 D49
EEPDI
B30-2237-05
B30-2237-05
D69-72
REVERSE
PTT BOARD
CURRENT SET
PREVENTION
ON:6.90V
Q51
RN4902
INT0
PWR SW LCD LED SW
RESET
TX-RX UNIT
(X57-674X-XX)(B/3)
CN9
KOUT3 MIC1
KOUT2
KOUT1 CN8
KOUT0
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 LED
5M
2SK1830
* 0 # CALL KEY LED SW
+B
ON:4.78V
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
PLLEN
SMV
SQV CN15 * CN17
C19
15p
D1,2 D6 R13 6.8k R11 150k
LV
VCO FREQUENCY CONTROL VCO MODULATION Q1 RF AMP
2SC5066(O) RF AMP
L68 L1 D1 C2 L3 82n C15 R348
10u 1SV325 1000p 12p 220 Q5
2SC5488
VCO Q2
2SC5488
C13
D5 C4 D5 R7 0.5p
FREQUENCY SHIFT (B)
1000p HSC277 47k
Q4 4.45V
Q3 2SC4617(R) RIPPLE FILTER
3.63V
2SK1830
FINAL
SPEED UP
SHIFT VCO SHIFT CONTROL SW
L53 15n C24 R19 120k
R31 R30
1000p
C37 C22
2.2k 1.2k
1000p
18p
C20
C38
Q6 8p
0.01u 2SC5488
C50 22p RF AMP
D16 4.45V
PLL LOCK DETECTION
R35 120k
FREQ D16
R32 PLL IC
VR1
MA2S111 1k
BPF/APC R37 56k
C40 0.1u
500k
1.58V 4.63V
KAPC
R36 10
VC VCC 5C TEMP
12.8MHz
L64 C51
GND OUTPUT
4.7u 22p
CP2
X1 3.9k
L77-1931-05 PLLEN
DATA
CLOCK
PLLLD
CF1
L72-0968-05
450kHz
T:0V
R:4.63V
5R
R131 330k
C173 2nd L.O. 4.76V
180p
0.53V
SQ FILTER
C174 C166 C187 R132
180p 0.01u 2p 2.2k
Q23
KTC4082
TRIPLER
FM IC
R116 IC3
TA31136FN
120k 4.82V 5R
AF FILTER R124 C190
C169 R123 3.3k
Q21 C170 R119 R122
2SC4617(R) 0.01u R134
0.068u 0.068u 1.8k 2.7k 1.8k R128 C180 390k
C167 0.72V
IF AMP
R117 3.3k 120p C191
0.1u Q24
2SC5488
2.7k (D) 0.01u
Q20
2SK1830
Q22 CD1
RN2105 450kHz
AF MUTE SW R120
2.7k
WIDE/NARROW
CHANGEOVER SW
W:111mV
N:4.79V
5R 5R
BPF/APC
T:4.23V T:4.85V 12.46V
5T RF SW
R:0V R:0V L55 C75 C329 L15
+B
D8 TX PATH C65 18p C68 R271 C326
1.30V 10n 1000p 56p 6.8n
RF AMP
HSC277 18p 12 1000p L12 Q11
Q9 2SK2596
2SC5488
D9 R347 DRIVE 10n
1.40V AMP DRIVE
AMP
HSC277 100
Q10
RF SW 2SC4926YD
2.00V
R34
3.3k
5R Q15
2SC4617(R) VOLTAGE
4.90V Q10 OPERATION SW DROP
5T 5T
VGG
VDD
C137
L28 L29 22n 12.29V
27n Q12 L17 C89
5p POWER 2SK3476
AMP 18.5n 1000p ANTENNA SW
C136 L20 L21 L22
D10
T:0V 7T 9T 9T
C94 ANT
10p R:0V XB15A709 1000p C96 12p C98 8p C100 7p
CN10
(G) (B) (B)
R61 220
Q12 GATE
VOLTAGE SW
R62 220
Q58
2SK1830 D17
OVER INPUT
2.29V
(HIGH POWER) PROTECTION
D12,13 HSM88AS
FINAL ANTENNA SW
5T
R76 150k (D)
APC
R74
100k C108 DIFFERENTIAL
AMP
100p VGG
(D) IC2 NJM2904V
1 8 APC OUTPUT SW
AOUT V+ TEMP
2 7 DC SW R85 560 COMPENSATION
A-IN BOUT
3 6 R81 390k
A+IN B-IN
+B R75 4 5 C112 1000p
100k GND B+IN
APC CIRCUIT Q14
Q13 (D)
OPERATION SW R83 56k APC RN4902
2SK1830 R79 C110 1000p
5T APC OUTPUT
VOLTAGE LIMITTER
150k (D) C356 0.01u
KAPC
KAPC
TEMP
D14
2.68V REVERSE CURRENT PREVENTION
38.85MHz
1st IF
XF1
R90 L71-0619-05 L27 4.71V 1st MIXER D18,19
680n
330 C128 R88 Q16 RX BPF TUNING
3SK318
2.42V C501 C500 4.66V D20,21
0.01u 330
R341 C142 1.5p 1.5p R102 RX BPF TUNING
0.27V
0 0 C159 C502
1000p (B) (B) 2p 3p
R345
0 (B) (B)
Q17
2SK1215(E)
RX 1st AMP C162
R291 R290
0 0
47p
(G)
5R
X57-674X-XX D44 D47 D60 D62 D63 Q59 C320 C321 C350 C510 C511 C512 C514 C515 C516 C517
0-11 TH-K2AT K,K2 B30-2205-05 B30-2205-05 NO MA2S111 MA2S111 2SK1830 8200p 8200p 0.1u NO NO NO NO NO NO NO
2-71 TH-K2E E NO NO MA2S111 MA2S111 NO NO NO NO NO 100p 470p 470p 470p 470p 470p 470p
2-72 TH-K2ET E3 B30-2205-05 B30-2205-05 NO MA2S111 NO NO NO NO NO 100p 470p 470p 470p 470p 470p 470p
5R
0-21 TH-K2AT M,M2 B30-2205-05 B30-2205-05 NO NO MA2S111 NO NO NO NO NO NO NO NO NO NO NO
X57-674X-XX R230 R257 R258 R259 R261 R264 R344 CN17
0-11 TH-K2AT K,K2 220 56k 680 680k 47k NO 100k NO
2-71 TH-K2E E NO NO 0 0 NO 0 NO E23-1081-05
2-72 TH-K2ET E3 220 NO 0 0 NO 0 NO E23-1081-05
0-21 TH-K2AT M,M2 220 NO 0 0 NO 0 NO NO
Note : The components marked with a
dot ( ) are parts of layer1.
BPF/APC
Reference voltage value are measured when the power supply voltage is 13.8V(DC IN).