Kenwood NX-411 Service Manual page 83

AT
TX-RX UNIT (X57-8120-10) (A/2)
BUFFER AMP
(CV)
R545
1k
R536
0
50C
7 CV
/T_R
ASSIST
R503
4
I2CCK
100
5
R504
6
I2CSDA
100
1
33C
2
7
33C
13
L503
33C
14
15
16
17
18
L502
PLL_MOD
7
SDO1
/PCS_RF
SCK1
7
33C
AU
CN501
D507,508,510,512
CV VCO (FREQUENCY CONTROL)
Q502
2SK879-F(Y)
L505
R543
270n 1SV323F
0
L504
R539 R541
0 390
D505,506,509,511
VCO (FREQUENCY CONTROL)
L506
R544
270n 1SV323F
0
TEMPERATURE
IC502
DETECTION
LM73CIMKX-0
R508
3
SMBCLK
VDD
10
2
ALERT
GND
SMBDAT 1
ADDR
X501
L77-3016-05
R509
10
4
VC VCC
R510 R512
L501
0 0
3
GND oUTPUT
4.7u
33C
6
LD/PS2 CPout1
5
VCCcp2 VCCcp1
4
CPout2
LD/PS1
IC503
SKY72310-362
C527
3
/Fvco /Fin
PLL IC
100p
2
Fvco Fin
1
VCCcp2 VCC
R577 C594
10 100p
R517 10 C515 100p
R518 10 C516 100p
R516 10 C517 100p
AV
SCHEMATIC DIAGRAM
Q507
VCO
RX VCO
R : 4.12V
T : 4.12V
D507 D508 C553 L511
HVC350B 5p 27n
R531
0 R552
100k
R : 0.04V
T : 4.12V
D506 D509 C554
HVC350B 10p L512
33n
R532
0
33C
DC SWITCH
R : 7.50V
T : 7.50V
Q501
2SC5383-T111
R :
T :
D501
SPEED UP
DIODE
R514
1k
C593
100p
R527
10
C528
0.1u
C529
R524
100p
10
R525
47k
C523
0.1u
C524
100p
7
33C
AW
NX-411
L516
R561
270n
22
R : 0.71V
T : 0.71V
C567
R 1.13V :
7p
T : 1.13V
R560
C570 100k
0.5p
Q508
2SC5636
Q508
BUFFER
AMP
(VCO)
TX VCO
Q504
VCO
L514 270n
R559
22
R : 0V
C566 7p
T : 1.48V
C571
0.5p
R : 0V
T : 0V
T(TA) : 4.27V
Q506
2SJ347F
R : 4.28V
DC SWITCH
T : 4.28V
Q505
R : 4.27V
SSM6L05FU-F
T 4.27V :
T(TA)
R554
470k
R556
470k
IC504
XC221A1200MRG
R : 6.94V
1 5
VoUT
T : 6.94V VSS
2
VDD
R521
470k
3 4
7.50V
IN+
IN-
7.50V
VCO Tune
OP AMP (PLL)
ASSIST
R : 4.96V
T 0V :
BUFFER AMP (RX)
R802
10
L72-1040-05
C821
R804 0.1u oUT
0
7
X57-812 (A/2) 9/11
AX
R : 3.84V
T : 3.90V
Q506
DC SWITCH
(VCO)
: 0V
SPEED UP DIODE
D502
DA221
R523 R574
10M 10M
R : 4.97
T 0V :
50R
CF802
C824 R818
IN 0.1u 1k
R : 2.02V
T : 0V
7
33C
83