Kenwood RXD-303, Service Manual, Page: 17 / 36

A C E G I B D F H J
2
1
3
5
7
4
6
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
PB IN1
PB IN2
PB FB1
PB FB2
OUT-L
RFS
RFC
A/B
AEQ
REC-MUTE
VG
AGC
RIN-L
VCC
ROUT-L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PB IN1
PB IN2
PB FB1
PB FB2
OUT-R
MS OUT
IREF
SPEED
BEQ
METAL
AGC TC
AGC
RIN-R
GND
ROUT-R
1
2
3
L-PLAY
COM
R-PLAY
1
2
3
4
5
6
L-PLAY
L-REC
R-REC
R-PLAY
GND
ERASE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
MTR SPEED A
MTR SPEED B
B PLAY SW
+5V
PHOTO OUT B
CPM +
B SOL
A SOL
R REC SW
PHOTO OUT A
B PACK SW
A PLAY SW
GND
A PACK SW
F REC SW
B CrO2 SW
A CrO2 SW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
L-PLAY-OUT
AUDIO+12V
R-PLAY-OUT
BIAS-GND
L-REC-IN
MECHA+12V
R-REC-IN
M-GND
B-EQ(L=NOR)
PH-B
PH-A
TAPE MUTE(L=MUTE ON)
REC MUTE(L=MUTE ON)
A-EQ(L=NOR)
A/B(H=B PLAY)
R/P(H=REC)
BEAT-C
BIAS(H=BIAS ON)
NOR(H=NOR)
B-SOL
CPM
A CrO2 SW
B CrO2 SW
F REC SW
A PACK SW
B PACK SW
R REC SW
+5V
B PLAY SW
A-SOL
A PLAY SW
1
2 3 4
CNT
5 6 7 8
VCC
9
10u16
+
C5
100
R125
C6
10u16
+
180K
R2
180K
R1
1000P
C1
1000P
C2
10u16
+
C8
10u16
+
C7
180K
R4
180K
R3
820P
C3
820P
C4
R10 1K
R8 1K
C12
22u16
+
30K
R135
R134 10K
4.7u35
+
R133 1M
+
C118 47u16
C25 220P
L1 10mH
C26 220P
L2 10mH
C24 10u16
+
R18 15K
C23 10u16
+
R17 15K
1/4W
C1
19
0.018
150
150
+
0.018
C11
22u16
R132 10K
C117 100u16
+
+
C116 10u16
R131 10K
R130 10K
C115 4.7u35
+
1K
R9 1K
C114 4.7u35
R129 10K
+
+
C113 47u16
R128 10K
3
2
4
1
6
5
7
8
C29 4.7u35
+
4.7K
R29
4.7u35
+
C35
4.7K R31
47K
VR3
47K R33
1.1K
R23
100P
47K
8.2K R35
1K
R25
8.2K R36
VR4
47K
C30
4.7u35
+
R32 4.7K R34 47K
R24
1.1K
4.7u35
R30
4.7K C36
+
100P
47K
1K
R26
470K
R28
470K
R27
10
R140
+
C121 1u50
R138 2.4K
R139 10K
R144 2.4K
+
C120
100u10
10
R136
1.2K
R137
+ C1
10
10u16
VR3
VR4
4.7u35
+
C22 4.7u35
+
R14 2.7K
3.0K
R16
+ C20
0.47u50
W49
5.6K
R123
5.6K
R124
L3
220K
VR1
220P C27
15K R19
C28 220P
R20 15K
VR2
220K
2200P
C108
2200P
C109
10 1/4W
R122
0.01
C105
5.6K
R1
19
0.015 C103
R121
10 1/4W
C104 0.015 R120
5.6K
+
C106
10u16
10 1/4W
R118
18K
R1
17
+
C101
10u16
10K
R1
16
R1
15
1.8K
R1
14
10K
10uH
L4
+
C100
1u50
W42
16
17 19 18
R141 16K VR5 4.7K
4.7K R103 4.7K R101 4.7K R105
47K
R100
47K
R104
47K
R102
20 22
21
A
B
CrO2 2
CrO2 1
F-REC
PACK 2
PACK 1
PLAY SW2
COM
COLLECTOR 2
R-REC
SOL 2
SOL 1
COLLECTOR 1
MTR +
PLAY SW1
+5V
B
A
3
2
1
6
1
5
4
3
2
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
10K
R106
68K
R143
10K
R107
10k
R1
10
10K
R108
68K
R142
10K
R109
10K
R1
12
10K R
111
10K
R1
13
23
24
25
26
27
28
11
29
10
31
R15 3.0K
R13 2.7K
C19 0.47u50
+
+
C17
10u16
24K R1
1
10u16
+
C18
24K
R12
9
13
21
22
23
23
22
21
9
13
18
1u50
+
C111
1K
R126
6
7
8
11
10
19
16
17
18
Q16
+B
120 1/4W
R127
7
8
6
18
28
31
29
26
27
21
20
22
23
24
25
+5V
C1
12 100u16
+
4.7u35
+
C37
4700P
C34
C107
VR1
VR2
0.01
+B
C21
U.S.A.
EUROPE
ABB.
E,E1
DESTINATION
CANADA
COUNTRY
P
K
2-71
0-10
No.
UNIT
U.S.A.
ABB. COUNTRY
EUROPE
E,E1
K
DESTINATION
No.
2-71
0-10
UNIT
EUROPE
U.K.
DESTINATION
COUNTRY
T 0-51
2-71
0-71
E,E1
UNIT
No. ABB.
DESTINATION UNIT
CANADA
U.S.A.
COUNTRY
0-10
No.
K,K1
P,P1
ABB.
DESTINATION UNIT
U.K.
GENERAL MARKET
PX
COUNTRY
0-51
0-10
No.
Y
T,T1
KOREA H
M,M5
ABB.
AUTRALIA X
AUTRALIA X
EUROPE 2-71 E,E1
1K 33u35
+
R145 C122
R6 C10 47P C14
47P C16
47P C13
47P C15
R7
R5 C9
1K
R37
3.3K R39
C31
R21
3.3K R40
1K
R38
R22
C32
4.7u35
C38
+
4700P
C33
+12V
+5V
+12V
+5V
+B
+B
+B
+B
+5V
+B
+B +B
+12V
+B
+B
+B
+12V
+B +B
+12V
+12V +12V
+12V
+5V
+B
+12V
+12V
+12V
+12V
+B +B
+12V
DESTINATION UNIT
U.S.A.
CANADA
COUNTRY
P
K
ABB.
0-10
No.
EUROPE
AUTRALIA
GENERAL MARKET
DESTINATION
COUNTRY
Y PX
U.K.
E,E1
T
M,M5
X
2-71
0-51
0-10
ABB.
UNIT
No.
C13-16
NO
YES
C13-16
NO
YES
NO
C13-16
NO
NO
YES
C13-16
C13-16
NO
C13-16
NO
YES
YES
NO
C13-16
IC1
IC2
CASSETTE
MECHANISM
(D40-1661-05)
MECHANISM ASS’Y (X28-304X-XX)
A
(T) TYPE
ONLY
WH2
WH1
CN2
CN1
PLAY/REC
HEAD SW
PLAYBACK/
REC EQ.
IC3(1/2)
IC3(2/2)
Q17
Lch
Q18
Rch
Q20
Q19
D5
PB LEVEL
(Lch)
A/B
PB LEVEL
(Rch)
A/B
Q14
Q13
Q15
Q16
Q12
Q11
BIAS
OSC
Q10
D4
D2 D3 D1
Q2
Q3 Q1
Q5 Q6 Q4
MTR
ERASE
Rch
Lch
Rch
Lch
SOL
SOL
Q8 Q7 Q9
BIAS
CONTROL
BEAT
CONTROL
CANCEL
A/B
TAPE SPEED
A.SOL
CONTROL B.SOL
CONTROL CPM
CONTROL
IC1 : CXA1498S
IC2 : BA3126N
IC3 : NJM4565L
Q1-3 : 2SA1286-T11
Q4-9,16,19,20,24
: KRC103M or
UN4212
Q10 : KTC3205 or
2SC3940A(R,S)
Q11,12 : KTC3199(Y,GR) or
2SC2785(F,E)
Q13,14 :
2SC1845(F,E)
Q15,23 : KRA103M or
UN4112
Q17,18 : 2SC2878(B)
D1-4 : 1SS133 or
HSS104A
D5 : MTZJ5.1(B) or
HZS5.1N(B2)
B LINE
GND LINE
SIGNAL LINE
RECORDING LINE
-CN1
X13-A/3
1/4
A-HEAD
B-HEAD
E3
E2
E1
BIAS
(Lch)
CURRENT
CURRENT
(Rch)
BIAS
BIAS
AVR
A/B SW
KTC3200 or
RXD-503/503E (X28-304X-XX)
RXD-303/303E (X28-304X-XX)
RXD-653/653E (X28-304X-XX)
RXD-A53/A53-GR (X28-3040-10)
(X28-304X-XX)
Q22 Q21
Q23
Q24
UN4216 or Q21,22 :
DTC143TSA
RXD-553/553E/553-GR/553E-GR
RXD-A33 (X28-3040-10)
RXD-353/353E (X28-304X-XX)
0.7V
4.9V
0V
0V
1.2V
2.6V
2.6V
0V
0V
4.9V
8.8V
4.9V
REC : 4.7V
4.6V
REC : 0V
9.5V
2.6V
2.6V
0.7V
0V
0V
B PLAY : 3.5V
A PLAY : 0V
PLAY : 0V
4.9V
4.9V
12.1V
5.0V
5.2V
5.2V
5.0V
5.0V
DECK B : 11.1V
DECK A : 0V
DECK B : 0V
DECK A : 8.8V
DECK B :
3.5V
REC : 4.6V
TYPE 1 : 4.6V
12.1V
8.0V
12.1V
12.2V
12.1V 11.5V
12.1V
5.0V
RXD-653/653E (1/4)
RXD-303/303E/353/353E (1/4)
RXD-503/503E/553/553E/553-GR/553E-GR (1/4)
RXD-A33/A53/A53-GR (1/4)
RXD-303/353/503/553/653/A33/A53
Y39-3420-10
CAUTION: For continued safety, replace safety critical components only with man-
ufacturer's recommended parts (refer to parts list).
indicates safety critical com-
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.
The DC voltage is an actual reading measured with a high impedance type voltmeter with a cassette
loaded at playback mode. The measurement value may vary depending on the measuring instruments
used or on the product. Bias circuit DC voltage is measured while in the record mode.
DOLBY and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. Noise
reduction circuit made under license from Dolby Laboratories Licensing Corporation.