Kenwood RXD-790 Service Manual page 24

A B
(X05-4752-10) : V
(X05-466X-XX) M,I,X,K,H TYPE
1
2
D1
D2
J1
FM 75Ω
Ω
FM 300 GND
AM ANT
3
X
W115
J2
4
IC1 : LA1832
IC2 : LC72131
Q1 : 2SC2714(R,O)
Q3 : 2SB1218A(Q,R) or
2SA1576A(R,S)
Q5,9,10 : 2SD1819A(Q,R) or
2SC4081(R,S)
D1,2,8 : 1SS133 or
HSS104
D3,4 : MTZJ5.1(B) or
UZ-5.1BSB
5 D10 : MA111
CAUTION: For continued safety, replace safety critical components only with man-
ufacturer's recommended parts (refer to parts list).
ponents. For continued protection against risk of fire, replace only with same type
and rating fuse(s). To reduce the risk of electric shock, leakage-current or resis-
tance measurements shall be carried out (exposed parts are acceptably insulated
from the supply circuit) before the appliance is returned to the customer.
6
The DC voltage is an actual reading measured with a high impedance type volt-
meter as the AM/FM signal generator is specified to the conditions as shown in the
list below. The measurement value may vary depending on the measuring instru-
ments used or on the product. The value shown in ( ) is actual reading mea-
sured in the AM made.
MODULATION
MODE CARRIER
FREQUENCY DEVIATION
FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot)
AM 1000(999)kHz 400Hz MONO 30% MOD
7
C D
L3
1uH
FM FRONT END
A1 (W02-2608-05)
D1
R2 C2 C6
TR1
C20 J4 33 3P 4P
1 ANT1 12P 0
2
ANT2
100K
3 GND
C9 C12
2P 12P
TR3
7 GND
C17
0.01
TR1 :2SK360
TR2~4 :2SC2413K or 2SC2778
D1~3 :1SV225 or HVM16
VT VOLTAGE
BAND FREQ VT
LF 2.0V
FM
HF 7.3V
LF 1.4V
AM
HF 4.9V
IC2
PLL
SIGNAL LINE
GND LINE
indicates safety critical com-
C2B I/F
X1 2.5V
7.2MHz
ANT INPUT
C38
470P
60dB
60dB
E F
L1
R43
VT 5
J2 0 220 1/4W
+
T1
TR2
10.2V(0V)
J1 R10
VCC 4
0 180
R7
+
TR4
IF-OUT 8
OSC 6
R24 R25
5.6K 100
VT
1/4W
12.2V
5.4V
+ +
(98MHz)
+
5.1V
C52
47P
C28 R27 1K
0V
2.5V
0.022 0.9V 0V
12.1V(0V)
0V
0.9V 5.1V
(2.5V) Q3
2.5V
(0V)
REFERENCE PHASE DETECTOR UNLOCK
DIVIDER CHARGE PUMP DETECTOR
1 SWALLOW COUNTER
1/16, 1/17 4bit
2
12bit
PROGRAMMABLE
DIVIDER
UNIVERSAL
DATA SHIFT REGISTER LATCH
COUNTER
0V
(9.7V)
ST:4.0V
MONO:0V
R20 1K
2
R23 1K
4
R22 1K
5
R21 1K
3
G H
C3
4P
R45 C8
R40
1K
3.7V
10K 0.01
ALC
BUFF
R6
FM IF
AMP
100
1.9V 10.4V
Q1
R44 CF2
LEVEL
100 CF1
DET
1.2V
FM
IF
12.3V
2.1V
+
FM
BAND
SW
R32
1.2K
I J
+ +
2.1V
IC1
2.7V
AM/FM
1.7V (2.0V)
SYSTEM
(2.0V)
IC
2.1V
5.1V
0V
(3.0V)
AM AM AM
OSC MIX RF.AMP
AGC
AM AM
IF DET
S-CURVE AM/
FM
IF
COMP
BUFF
FM
DET
TUNING
DRIVE
AM
FM
REG GND
3.1V(3.7V)
2.1V 0V
2.1V
5.1V
ST:0V
AM IFT
MONO
:5.1V
L2