Kenwood RXD-803, Service Manual

Page: 21 / 35

AT AU AW AV AX
2
1
3
5
7
4
6
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Lch IN
A.GND
Rch IN
+12V
(MAIN R)
A.GND
(MAIN L)
B.CONT
SELFCHECK
PROTECTION
CS RELAY
ATT
MUTE
BEEP
F RELAY
HP L
HP R
R5
2.2K
680
R3
R1 1.5K
680
R4
2.2K
R9
R2
1.5K
2.2K
R6 R10
2.2K
R1
1
10K
10K R12
2.2K
R21
R22
2.2K
R38 1M
R14 56K
56K
R13
1000P
C3
1000P
C4
1 2
3 4 5 6 7 8 9
10
11
12 13 14 15 16 17 18
+VH +VL +ZD -ZD -VL -VH SUB GND R OUT+ R OUT
-
L
OUT
-
L
OUT+
-V(PRE) +V(PRE) R IN R NF BIAS L N
F
L I
N
+B
+B +B
B B
B
R19 R23
R25 10K 56K R27
1000P
C7
2.2K 2.2K
680 R17
1000P
2.2K 2.2k
10K R26
R20 R24
R28 56K
C8
R18 680
1.5K
R15
2.2K
R49
2.2K
R50
100u63
+
C55
100u63
+
C56
R85 3.3K 1W R86 3.3K 1W
10
9 8
C9 220P
R80 220 1/4W
+
C42 100u63
C57 4700P
C67 33P
C68 33P
R121 33K
C46 100P C45 100P
820
R46
47u25
C16 +
47u25
C15 +
820
R45
C18 3P
R48 56K
C17 3P
R47 56K
+B
8
9
10
C20 C19
R56
1K
R55
0.01
1K
0.01
7.5K
R51
R52
7.5K
R31 0.22 2W
R30 0.22 2W
R32 0.22 2W
R29 0.22 2W
1K
R43 R44
1K
W79
W82
+12V
+12V
+12V
10K R41
10K R42
4.7u50
C85
+
3.3K
R36
R33
6.2K
47u25
C84
+
+12V +12V
+12V
10K
R57
R58
10K
L1 3uH
4.7 1/4W
4.7 1/4W
L2 3uH
R87 220K
R88 220K
R83
R84
47K R34
R37 1M
C59
+
100u50
C60
100u50
+
C13 56P
R16
1.5K
4.7u50
+
C1
4.7u50
+
C2
4.7u50
+
C5
+
4.7u50
C6
Q1,2,5,6
Q3,4,7,8
2.7K
R53
2.7K
R54
B
B
+B
+B +B
+B
B
B
+B +B
B B
+B +B
B B
B B
+B +B
+B
B
+B
B
(SW L)
(SW R)
Sch
Cch
+B
Q25
Q26,27
CN1
Q1
Q2
Q3
Q4
POWER IC
FLch/FRch
Q6 Q8
Q5 Q7
D22 D23
Q9 Q10
D3
D6
Q25
Q26
Q27
D19
D20
DRIVER
PROTECTION MUTING
ATT.
-10dB
PROTECTION
DC
FRch
FLch
Cch
Sch
CURRENT
PROTECTION
2/4
X13-A/3
-CN6
-WH1
2/4
X13-A/3
-WH2
X13-A/3
2/4
-CN5
X13-A/3
2/4
IC1
(X07-319X-XX) (A/4)
B
F
E
C
53.3V
-51.8V
55.0V
26.5V
-55.0V -26.5V
OFF : -0.7V
ON : 2.3V
0V
0V
0V
0V 0V
54.3V
54.7V
54.4V
0V
12.2V
53.3V
54.0V
CAUTION: For continued safety, replace safety critical components only with
manufacturer's recommended parts (refer to parts list).
indicates safety critical
components. 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
resistance measurements shall be carried out (exposed parts are acceptably insu-
lated from the supply circuit) before the appliance is returned to the customer.
The DC voltage is an actual reading measured with a high
impedance type voltmeter with no signal input. The mea-
surement value may vary depending on the measuring
instruments used or on the product.