Tx-Rx Unit (X57-675X-Xx) (A/3) - Kenwood TH-K4AT Service Manual

K
TH-K4AT/K4E
TX-RX UNIT (X57-675X-XX)(A/3)
MOD
VOLIN
5MS
5T
+B
NAR
TO
QT/DQT
5R
5C
5MV
TEMP
FINAL
AFM
KAPC
DATA
CLOCK
SHIFT
PLLLD
PLLEN
SMV
SQV
5M
R237 100k
EEPROM
8
1
CS VCC
2 7
SO HOLD
3 6
R238 1k
WP SCK
4 5
R236 1k
GND SI
IC15
AT25160N10SI27
LAMP
5MS SW
R239 R241
BATT
330k
1k
L63
5M
5C SW
PTTI
BPF/APC
VOX
EEPCS
EEPDI
5R SW
5T SW
INT0
RESET
PWR SW
KOUT3
KOUT2
KOUT1
KOUT0
VUKEY
TYPE
KIN4
KIN3
KIN2
KIN1
KIN0
IM
MIG
5C/5R/5T AVR
8V
5M
+B
X57-675 3/5
L
SCHEMATIC DIAGRAM
5C SW
5MS SW
Q41 Q57
4.95V 4.83V
RN2105 RN2105
5.0V AVR
R248 R246
3.9k 3.9k
D60
KEY TYPE DETECTION
D62-65
D61
MARKET CODE
UHF TYPE DETECTION DETECTION
TYPE
D69-72
REVERSE
CURRENT
PREVENTION
1/F 2/VFO 3/MR
MENU
4 5 6
7 8 9
0 #
*
10KEY BOARD
M N
C316
0.1u
T:4.95V T:0V
5.0V AVR
R:0V R:4.90V
5.03V
5R/5MV
SW
C347
470p
C348
470p
C311 R242
0.1u 330k
INT0
4.98V
R244
0
IC10
S-80844CNNBB85
4.4V VOLTAGE DETECTION
SET
Q51
RN4902
LCD LED SW
TX-RX UNIT
(X57-675X-XX)(B/3)
CN9
CN8
F/CALL
VFO
D42-44,46,47
KEY
MR
ILLUMINATION
Q50
LED
2SK1830
CALL KEY LED SW
ON:4.92V
O
5T SW
T:4.99V
R:0V
Q55
CPH3317
4.79V
R243
330k
4
1
4.80V
VSS
OUT
RESET
3
2
VDD
CD
IC11
S-80930CNNBG80
3.3V VOLTAGE DETECTION
TX-RX UNIT
(X57-675X-XX)(C/3)
S7
S70-0485-05
CN7
CN6
PTT 1
1
MONI
KIN4 2
2
C374
*
KYO2 3
3
KYO1 4 4 D48,49
LAMP
LCD
BL 5
5
ILLUMINATION
LED
GND 6
6
D48 D49
B30-2237-05 B30-2237-05
PTT BOARD
ON:6.98V
MIC1
MOD
VOLIN
5MS
5T
+B
NAR
TO
QT/DQT
5R
5C
TEMP
FINAL
AFM
KAPC
DATA
CLOCK
SHIFT
PLLLD
PLLEN
SMV
SQV
BPF/APC
PTT