
CM
CO
CQ
CS
CU
CN
CP
CR
CT
CV
2
1
3
5
7
4
6
Y39-2980-51
RXD-M51/M51MD
CAUTION: For continued safety, replace safety critical compo-
nents 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-cur-
rent or resistance 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 no signal input. The measure-
ment value may vary depending on the measuring instruments
used or on the product.
1
2
3
4
5
6
7
8
9
10
11
12
Lch
A GND
Rch
+12V
+12V(NF)
GND(+12V)
GND(+12V REF)
GND(+8V)
GND(+8V REF)
+8V
+8V(NF)
MUTE
1
2
3
4
5
6
7
8
9
10
-30V
FL
FL
POWER
PROTECTION
AD2
AD1
F.OFF
+5.6V
D GND
10u25
C31
10K
R71
0.01
C30
220
R67
100K
R70
2.2K
R69
2.2K
R4
10K
R2
10K
R1
R68
2.2K
R12 10K
R1
1 10K
220u16
C34
+
180
R17
100u10
C7
+
100u10
C8
+
180
R18
10K
R20
10K
R19
5.6K
R15
5.6K
R16
1.2K 1W
R76
C3 1000P
C4 1000P
2.2K
R9
2.2u50
C1
+
R3
2.2K
2.2K
R10
2.2u50
C2
+
C11
220P
R66
47 1/4W
330P
C5
330P
C6
C10 220P
10
R22
560
R14
C9
220P
560
R13
10
R21
33
R35
33
R37
0.22
R41
0.22
R39
C13 100P
R23 8.2K
R25 3K
R27 82K
C15
+
R28 82K
R24 8.2K
C14 100P
R26 3K
1
2
3
4
5
Lch
Lch(SP)
GND
Rch(SP)
Rch
9
8
7
6
5
4
3
2
1
Lch
GND
POWER
F.OFF
D GND
+5.6V
9
8
7
6
5
4
3
2
1
Rch
C16 +
C29 100u35
+
33
R36
2.2K
R112
C71 100u16
+
R1
15
2.2K
2.2K
R1
14
R
111
820
+8V
R51
8.2K
620
R73
C38 47u16
+
2200P
C72
R113
10K
C32 1000P
5.1K
R80
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
1
2
3
4
5
6
7
8
9
10
12
11
5.1K
R79
R65 47K
R64
1K
22u50
C28
+
1K
R63
100K
R61
R62
82K
+
C27 2.2u100
10K
4.7K
R60
560
R57
C26 47u16
+
3.3K
R59
24K
R58
R55
4.7K
R104
3.9K
R44
1.5K
R46
1000P
C18
4.7
R50
C20
C22 0.22
C21 0.22
W40
W33
0.22
R40
0.22
R42
33
R38
3.3K
R30
7.5K
R32
7.5K
R34
7.5K
R33
7.5K
R31
3.3K
R29
R47 47K
C41 10u50
+
R52 4.7K
R83 6.2K
R81 1.5K
10u16
C39
+
5.6K
R84
C40 100P
47
+12V
+12V
R56
6.2K
+26.3V
+26.3V
3.9K
R43
1.5K
R45
1000P
C17
4.7K
R103
R48 47K
R98 47K
R99 47K
R100 47K
+
3300u35
C55
3300u35
C56
+
0.22
R72
C37 2200u35
+
R85 5.1K
R106
3.3K
220P
C12
1/4W
1/4W
2W
2W
Q13-16
Q17,18
4.7
R49
C19
1/4W
1/4W
1/4W
1/4W
2W
2W
Q5-8
R53 4.7K
10u50
C48
+
2.4K
R89
560
R87
R88 47
C46
+
10u16
R90 5.6K
C50
+
10u50
R91 1.8K
330u63
C49
+
4.7
R105
330u63
C62
+
47u50
C51
+
4.7K
R54
47u16
C45
+
100P
C47
FAN HIGH/LOW
FAN ON/OFF
2
1
1
2
3
4
5
6
7
8
9
10
7
9
10
8
5
6
3
4
1
2
2200u25
C44
+
0.22
R74
5.1K
R86
1000P
C33
2W
+8V
+5.6V
+12V
+19.2V
+23.2V
+26.3V
+19.2V
+23.2V
+26.3V
+26.3V
+23.2V
+19.2V
+8V
+8V
+26.3V
+26.3V
+26.3V
+26.3V
R82
2W
1W
1/4W
3
5
4
1
2
11
12
C77
0.01
C78
0.01
1
2
0.01
C73
C74
0.01
0.01
C76
C75
0.01
(M)
(T,E)
: AC110V-120V/220-240V~
50/60Hz
: AC230V~ 50Hz
2
1
WH6
WH5
BRN
YEL
4700P
C23
4700P
C24
10u16
C58
+
K1
C80 4.7u35
+
R95 2.2K
C57 330u25
+
T1
CN9
CN10
C59 1000P
470
R92
R97 10K
R96 4.7K
C63 6800P
2.2
R93
1/4W
R94
1.2K
6800P
C61
1/4W
F1
26.3V
26.3V
26.3V
26.3V
26.3V
26.3V
26.3V
26.3V
26.3V
26.3V
24.7V
26.3V
38.3V
52.9V
38.3V
30V
38.3V
+B
B
+B
+B
R121
1/4W
2.2
100u16
C81
+
R122
2.2 1/4W
5
1
4
3
2
R51 330 1W
R52 330 1W
R122
L07-2622-05
L07-2641-05
GENERAL MARKET
U.K.
0-21
2-72
T
M
250V
T800mA L
250V
T1.6A L
YES
0.22
NO
ABB.
DESTINATION
COUNTRY
UNIT No.
T1
F1
C21,
22
C19,
20
82
NO
NO
NO
CN4,
11
A
EUROPE
E
81,82
20
11
L07-2622-05
ABB.
U.K.
EUROPE
COUNTRY
2-71
T
E
250V
T800mA L
YES
0.22
R122
DESTINATION
UNIT No.
T1
F1
C21,22,
C19,
CN4,
A
YES
YES
YES
E7
1000P
C84
0.01
C83
C82
0.01
22u50
16
C15,
22u100
16
C15,
C81,
E7
NO
E7
YES
B
+B
+5.6V
+5.6V
+5.6V
+5.6V
CN1
CN2
D15
Q25
Q4
Q3
DRIVER
MUTING
DRIVER
Q8
Q6
Q5
Q7
D10
D11
Q11
Q10
Q9
Q12
Q17
Q16
Q14
Q13
Q15
D25
D26
CN5
E3
E4
DETECTOR
PROTECTION
CURRENT
DIFFERENTIAL
AMPLIFIER
Q18
Q36
D31
A
CONTROLLER
SUPPLY
FAN POWER
Q37
Q40
Q39
Q38
CONTROLLER
FAN ON/OFF
H:LOW SPEED
CONTROLLER
FAN SPEED
L:HI SPEED
Q28
CN3
CN7
CN8
Q22
D13
D12
D14
D6
Q21
Q20
Q19
MUTING
FIRST
OFF
D29
D30
Q23
POWER
AMP
Q27
(
)
Q30
Q29
D8
D9
D27
D7
D5
AVR
-38V
Q31
Q32
Q35
D28
D4
CN11
E6
E1
+8V AVR
+12V AVR
E5
D1
D2
D3
WH4
WH3
WH1
R-ch
L-ch
1
2
J1
Q33
D19
D18
D17
D16
D21
D20
Q34
CN6
D23
CN4
DRIVER
RELAY
+5.6V AVR
D32
: MTZJ8.2(B) or RD8.2ES(B2)
D15
: MTZJ3.9(B) or RD3.9ES(B2)
26,29-31
: 1SS133 or HSS104A
D13,20,21,23,25,
D11,22
: MTZJ6.2(B) or RD6.2ES(B2)
D10
: MTZJ5.6(B) or RD5.6ES(B2)
D8,9,27
: MTZJ13(B) or RD13ES(B2)
D6,7,14
: MTZJ5.1(B) or RD5.1ES(B2)
D4,5,12,16-19,28
: S5688B or 1SR139-400
D2
: D2SBA20F03
D1,3
: D3SBA20F03
Q36
: 2SB1640
Q34,40
: 2SC2003(L,K)
Q33
: 2SD2525
Q32
: 2SB1370 or 2SB1375
Q30
: 2SD2493
Q28
: 2SD2012 or 2SD2061
Q27,29,31,37-39
: 2SC2458(Y,GR) or
Q25,35
: 2SA1175(F,E) or
Q15,16
: 2SB1659K
Q13,14
: 2SD2589K
Q11,12
: 2SC4137F50(V)
Q9,10,21-23
: 2SA992(F,E)
Q5-8,17-20
: 2SC1845(F,E)
Q3,4
: 2SC2878(B)
2SA1048(Y,GR)
2SC2785(F,E)
-2/2
X09-A/2
4/6
4/6
X09-A/2
-2/2
3/6
-1/2
X09-A/2
D32
2
WH2
D22
E1
J1
-CN4
-CN1
-WH203
WH1
HEADPHONE
RXD-M51 (X07-299X-XX)
RXD-M51MD (X07-2992-71)
D28
: S5688B
GND LINE
SIGNAL LINE
B LINE
B LINE
SPEAKERS
(F09-0140-
FAN
5)
PROTECTION
(X07-299X-XX) (A/5)
(X07-299X-XX) (B/5)
(X07- ) (C/5)
(X07- ) (D/5)
(X07- ) (E/5)
I
J
D
(X14- ) (B/2)
POWER AMPLIFIER UNIT
SECONDARY UNIT
PRIMARY UNIT
RXD-M51MD(T,E) (5/6)
RXD-M51(M,T,E) (5/6)
HEADPHONE
8.3V
8.3V
12.3V
12.3V
OFF: 4.8V
ON: 0.7V
MUTING
4.5V
4.2V
5.5V
OFF: -1.1V
ON: 1.8V
ON: 3.9V
4.1V
27.2V
26.7V
0V
-0.6V
1.1V
-0.5V
-1.1V
-25.8V
-27.4V
-1.1V
1.1V
-0.5V
27.7V
27.7V
-27.4V
-26.3V
0.6V
-25.8V
-0.6V
0V
-11.7V
27.2V
26.7V
12.3V
7.9V
0V
0.7V
0V
0V
4.5V
12.3V
12.8V
5.78V
5.1V
23.8V
27.7V
-27.4V
8.3V
17.7V
17.8V
9.52V
5.2V
5.78V
-38.7V
-13.4V
-26.5V
-39.7V
-39.2V
-51.3V
-51.3V
-25.7V
-2.1V
17.8V
27.7V
23.8V
-27.4V
5.5V
12.5V
6.2V
13.5V
23.6V
RXD-M51MD(K)
SD2,2P(
98.12.10
19:06
y [ W 14