Kenwood NX-300 Service Manual page 90

BI
NX-300(G)
XC1-0130-XX
-10 K,K3
-11 K2,K4
TX-RX UNIT (XC1-0130-XX)
TH600
100k
THP
∗
CN600
-t°
50T
R : 4.75V
T : 4.8V
BUFFER AMP
R : 1.81V
T : 1.89V
Q600
2SC5636
TX C603
R : 1.48V
T : 1.36V
10p
R608
50C
47
+B
33C
3
19.2M
IFC
R : 4.849V
L701 T : 5mV
560n
C708
R : 0.731V
100p
T : 3.6mV
L703
R702 C706
47n
330k 10p
R571
C700 0
7p
Q700
2SC5108(Y)F
2nd LOCAL
TRIPLER
450kHz
OUT
R703
10
C709
0.1u
∗
L902
C710
0.1u
∗
C711
R710
0.1u
R709
∗
C814
R714
10
R705
0
50R
50IF
4
150C
90
XC1-013 3/4
BJ
SCHEMATIC DIAGRAM
CN601 D608 L602 L603 L605 L615 L902
NO 1SS400 18n 12n 6.8n 15n NO
E23-1167-05 NO 27n 18n 12n 22n 27u
CN601
RF AMP
R : 2.5mV
Q601
T : 2.37V
LOCAL SWITCH
2SC5636
D601
C607 R613
7p 0
HSC277
D600
LOCAL
SWITCH APC PROTECT
R635
560
R : 63mV
T : 128mV
R : 3.274V
T : 11.2mV
R : 0.65V
Q604
T : 140mV
R629
2SC5383-T111
27k
APC SWITCH
R : 61mV
T : 110mV
APC
SWITCH
APC SWITCH
R : 3.294V
T : 40mV
SSM3K15TE(F)
/APCSW
C705
4.7u
∗ ∗
C704 C715 C714
1000p
FM IC
IC701
TK10931VTL-G
R : 2.66V
T : -0.8V
1
CF700
oSC(B)
2
oSC(E)
C790
IN 3
MIXoUTPUT
0.1u
4
CoMPoUTPUT
VCC
C718
5
AMIFINPUT
NoISEAMPoUTPUT
0.1u
6
AMIFDECoUPLING
NoISEAMPINPUT
C721
7
FMIFINPUT AMAGCINPUT
0.1u
AGCAMPoUTPUT
8
FMIFDECoUPLING1
9 RFAGCoUTPUT
FMIFDECoUPLING2
C720 10
RSSIoUTPUT
LIMoUTPUT
10p
11
QUADINPUT
10k 12
FMDEToUTPUT AMDEToUTPUT
CF701
450kHz
OUT
R796 C727
0 0.1u
IC700
MCP6021-E/OT
BUFFER
BK
R619 R620 R621 R623 R624 R626 R658 R669 R710
NO 0 NO 10k 47k 330 1.8k 470
820 5.6 820 12k 33k 220 820 NO NO
PRE-DRIVE AMP
R : 5mV Q602
2SK3077F
T : 0.64V (K,K3)
0.99V (K2,K4)
∗ ∗
C613 C671 C615
470p
H : 4.65V
L : 4.64V
∗
R658
∗
C672
R654
∗ 270k
∗
D608 R669
C641
APC
10p
SWITCH
R648
150k
R649
150k
R : 13mV
Q605
T : 3.71V
R : 4.694V
T : 5mV
24 C730
RFINPUT
23 0.01u
GND
22
IF AMP
R724 100k
21
CoMPINPUT
20
C728 0.1u
R719
19
270k
18
17 C760 0.1u
R721 10k
16
R722 4.7k
15
C759 0.1u
14
AMSW
R725 22k
13
CN700
R726
18k
R : 2.03V
T : 85mV
C792 R727
IN
0.1u 2.2k
R : 1.81V
T : -100mV
BL
C613 C621 C623 C671 C672 C702 C704 C715
7p 15p 15p 7p 470p 47p
0 NO 0.01u
4p 4p 12p 10p 82p 10p 47p
NO
R628 C670
∗ ∗
C621 0 R620 470p
∗
R624 R627
0
H : 0.62V (K,K3)
0.99V (K2,K4)
L : 0.42V (K,K3)
0.78V (K2,K4)
R655 R659
10k 470k
IC600
TA75W01FUF
1 8
oUT1 VCC
Q610
2 7
IN1- oUT-B
EMD5
3 6
IN1+ IN2-
APC SWITCH
4 5
VEE IN2+
AUTO POWER
CONTROL
R : 7.11V
T : 1.52V
Q608
Q607
2SK1824-A
R657
LTC044EEBFS8
0 APC
APC SWITCH
SWITCH
R : 18mV
T : 3.92V R : 1.59V
T : 1.52V
R : 0.697V
XF700
R733
T : 3.6mV
58.05MHz
560k
OUT
C734 R737
IN
Q701 0.01u 220
2SC4215-F(Y)
CN701
VAGC
R731
10k
RSSI
OP AMP
(RSSI/VAGC)
IC404
BU7442FVM
R795
10k
5 4
IN+B VSS
6 3
IN-B IN+A
7 2
oUTB IN-A
8 1
VDD oUTA
R794
10k
BM
C716 C813 C814
82p
NO NO
27p 27p
NO
∗
L605
TX
50T
+B
IFC
1st LO
50R
C740 R739
RX
0.01u 220
33C
4
150C