Schematic Diagram - Kenwood TH-K40A Service Manual

A
TH-K40A/K40E
TX-RX UNIT(X57-822X-XX)
1
LCD
2
INPTT
PTT
MONI
3
BACKLIGHT
LED SWITCH
Q401
12A02CH
R437
3 . 3k
BACKLIGHT
CONTROL
SWITCH
Q402
2SC4617(R)
4
ENC
S41 9
B
C
A
C374
2
MIC300
0.056u
1 R350
8. 2 k
SURGE
ABSORPTION
MIC
J3 00
1
PTT/RXD
3
MIC
11
IM
10
R351
5
2 5MS
1 0 0
SP
J3 01
1 SPG
3
TXD/REM
4
SPK
2
AFO
INT SP
CN300
+
SPK
2
-
SPG
1
7.5V
6
+B
F300
PROTECT
BATT+
3.15A
BATTERY
TERMINAL
BATT-
GND
SB
CN305
VR300
POWER SW
/AF VOLIUM
7
26
X57-821 1/1 X57-822 1/4
B
S401 S402
#
9
S405 S406
6 5
S409 S410
3 2
S414
S413
D C
D401
D414,D415
OFF:0.40V
OVER VOLTAGE B30-2261-05
ON:5.57V
LIMITTER
LCD BACKLIGHT
OFF: 0V
ON:2.75V
C 3 59
3 3 0 0 p
R 3 55
4 7 0
R358 R364
1k
4 7 k R365
R363
R354
1 k 2.2k
1k
C353
0.047u
R359
3 3 0
R353
R361
1 0 k 47k
Q301
LTC044EEBFS8
DC SW
DC SW Q302
LTC044EEBFS8
7.5V
SB
5MS
+B
5.0V
VOLTAGE
REGULATOR/5V
REVERSE CURRENT
PREVENTION
IC306
XC6209B502P-G
D302
RB521S-30
1 NC 5
VoUT
2 VSS
3 CE 4
V I N
IC305
VOLTAGE
DETECTOR/RESET
C

SCHEMATIC DIAGRAM

D404
S403 S404
1SS388F
D408
0 D4 05
S407 S408
1SS388F D409
8 7
D40 6
S411 S412
1SS388F D410
1 4
D407 D A 2S 10 1
S415 S416
1SS388F D411
D4 04-407
B A DA 2 S 10 1
REVERSE CURRENT
PREVENTION
D416-D425
GREEN
D426
B30-2337-05
LED
R445
KEY BACKLIGHT
2 20
B30-1782-05
DC SW
Q403
LTC014YEBFS8
RED
D4 27
LED
R446
330
B30-1779-05
DC SW
Q404
LTC014YEBFS8
R466
0
PTT
TxD
REM
F301
SB
0.315A
SP MUTE SW
AF AMP ON:3.30V
Q303 OFF: 0.51V
Q305
2SK3577-A
2SK3577-A
10
9
8
C373 100p
7
C372
R370 R 37 6 6
1 0 u 1 0 0
470k
AF AMP ON:4.99V
OFF: 0V
SPM
5M
SB
5MS
+B
5MSC
DC SW
SSM3J05FU-F
Q304
R362
330k
D304
REVERSE CURRENT
PREVENTION
D
R431
X57-822X-XX D408 R431
D409
R432
0-20 M DA2S101 0
NO
2-71 E NO NO
DA2S101
5MS
KEYO4
D412
DA2S101
KEYO3
KEYO2
D408-D412
Key matrix
KEYO1
KEYIS
KEYIT
KEYI4
KEYI3
KEYI2
KEYI1
MONI
LAMP
5MS
GREEN LED
ON:5.0V
LEDG
OFF:0V
ON:4.98V
RED LED
ON:5.0V
LEDR
CN303
ENC2
ENC1
AF AMP
ON:7.49V
IC307
OFF: 0.33V
DC SW
TA7368PL
1
NC1
PoUT Q306
2
SSM6J08FU(F)
VCC
PW-GND
3
NC2
PRE-GND
C381
4 R 35 7
PHASE VIN
5 6 0
0.1u
5
NF RIPPLE
AF POWER AMP
SPG
XC6209B502P-G
SSM3J05FU-F
IC308
4 3
V I N
CE
DC SW
2
V S S
5
1
V o UT
NC
Q307
VOLTAGE
LTA023JEBFS8
REGULATOR/5V
E
R432
NO
0
5MS
5MSC
SPM
5CC
5TC
REM
5MS
INT PTT
RxD
PTT
TxD
BEEP BEEP
5M
SB
+B
RESET
5C
5T
Q 3 08
DC SW
5R
R:4.89V
T: 0.93V
5CC
5RC