Kenwood TH-K2AT Service Manual page 54

K
TH-K2AT/K2E/K2ET
TX-RX UNIT (X57-674X-XX)(A/3)
MOD
VOLIN
5MS
5T
+B
NAR
TO
QT/DQT
5R
5C
TEMP
FINAL
AFM
KAPC
DATA
CLOCK
SHIFT
PLLLD
PLLEN
SMV
SQV
5MV
5M
R237 100k
EEPROM
1 8
CS VCC
7
2
SO HOLD
3 6
R238
WP SCK
4 5
R236
GND SI
IC15
AT25160N10SI27
5MS SW
LAMP
5C SW
VOX
5R SW
5T SW
R239 R241
BATT
330k
1k
L63
5M
PTTI
BPF/APC
EEPCS
EEPDI
INT0
PWR SW
RESET
KOUT3
KOUT2
KOUT1
KOUT0
VUKEY
TYPE
KIN4
KIN3
KIN2
KIN1
KIN0
IM
MIG
5C/5R/5T AVR
8V
5M
+B
X57-674 3/5
L
5C SW
5MS SW
1k Q41 Q57
4.83V 4.66V
RN2105 RN2105
1k
5.0V AVR
R248 R246
3.9k 3.9k
D60 D62-65
KEY TYPE MARKET CODE
DETECTION DETECTION
TYPE
D69-72
REVERSE
CURRENT
PREVENTION
1/F 2/VFO
MENU
4 5
7
8
0
*
10KEY BOARD
M
SCHEM ATIC DIAGRAM
C316
0.1u
T:4.95V T:0V
5.0V AVR
R:0V R:4.90V
5.01V
5R/5MV
SW
C347
1000p
C348
1000p
4.68V
C311
R242
330k
0.1u
INT0
4.92V
R244
0
IC10
S-80844CNNBB85
4.4V VOLTAGE DETECTION
SET
Q51
RN4902
LCD LED SW
TX-RX UNIT
(X57-674X-XX)(B/3)
CN9
CN8
3/MR F/CALL
6
VFO
9 MR
Q50
2SK1830
# CALL
KEY LED SW
ON:4.78V
N O
5T SW
T:4.95V
R:0V
Q55
CPH3317
4.69V
R243
330k
4
1
VSS
OUT
RESET
3
2
VDD
CD
IC11
S-80930CNNBG80
3.3V VOLTAGE DETECTION
TX-RX UNIT
(X57-674X-XX)(C/3)
S7
S70-0485-05
CN6 CN7
PTT
1 1
MONI
KIN4 2
2
KYO2 3
3
D48,49
KYO1 LCD
4 4
LAMP
ILLUMINATION
BL 5
5 LED
GND 6
6 D48
B30-2237-05 B30-2237-05
ON:6.90V
MIC1
D42-44,46,47
KEY
ILLUMINATION
LED
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
D49
PTT BOARD