Onkyo HT-R520

PRINTED CIRCUIT BOARD VIEWS-3
TX-SR502/E/8250/HT-R520
A
1
2
3
4
5
BCD
U02
DISPLAY PC BOARD (NADIS-8231)
Soldering side
Component side
5
C
7
5
01
01
502
C
7
5
02
02
C
C7503
7
503
C
7504
C7
504
50
C7505
C
5
7506
C7
0
6
C7507
C7
50
07
7
C
75
C7508
8
8
C
750
C7
C7
C7509
9
0
750
C
7510
C7511
1
1
75
513
C75
1
C
3
C
7514
C
751
5
5
C7516
C
C7517
C
C7521
C
52
C7522
C7522
C7523
C7
7
5
3
C
D
7
50
1
D750
0
02
2
D7503
D7
0
3
503
0
3
D750
50
04
04
7505
7505
D7505
D7505
507
D
7
507
07
J
L7
50
1A
JL7502A
2A
L
7505
A
P
7502
A
503
3
A
P
7
5
Q
Q7
7
501
Q7501
1
Q
75
01
Q
7502
Q7502
50
02
2
Q
Q7
75
Q
Q7503
Q
Q750
03
Q
7504
Q75
75
Q7
7
506
506
Q7507
Q
0
Q7507
50
7
R7513
513
R
7
7
R
R
514
51
5
R7
5
01
01
R7502R7502
R7503
R7503
R7503
R7505
R
0
5
R7506
R
R7
7
75
7
R
R
R
R7507
07
R7
75
50
R
0
0
R7
R7
R7508
8
R7
5
50
R
7
0
7
7
R
R7509
9
R7
5
50
R
7
0
7
7
R
R7
R7
R
R
7510
7510
1
R751
R
R7512
R75
2
R7515
1
5
51
R7515
5
1
7
5
51
R7516
R
7
51
R7
1
5
R7516
R
7
51
R7
1
5
R7517
R
7
R
R7517
R
7
R
R7518
R
R
R7519
R7519
R7520
7520
R7520
R
R
7
521
2
R7522
22
R
7
R7522
R7
R7
R7
R7
R
R
R
R
7523
7523
7523
7523
R7
R7
75
24
6
6
R752
752
R7527
R75
R7527
R
R7527
5
R7528
8
R7529
R752
R75
R7530
53
R7530
3
R7531
3
R
R7531
3
R7
R7532
7
5
R7580
R7580
80
80
75
75
R
R
R7581
R7581
8
8
7
7
R7582
R7582
5
R
2
R
761
1
R
761
2
3
3
R7613
R7613
R7621
2
R7
R7622
R
762
3
R7
6
24
R7625
R
762
6
31
31
1
1
R76
R76
2
R
7
632
R7633
7633
R7634
7634
R7635
7635
R7636
7
636
R7637
6
R
7641
R7
6
4
2
R7643
R
R7
R
7644
4
64
R
R
7
6
4
5
R7646
7646
S7501
0
1
S7501
S7611
S7612
S7612
76
S7612
S7613
13
S76
613
S76
S7614
S761
4
S
7621
2
S7622
S7622
S7623
S7623
S
7624
S
7
6
2
5
S7626
S7626
S7626
S
S
S
S7627
S76
S7627
S762
S
7
631
S
763
2
S7633
S
7
63
4
S
7
635
S7636
S
S
S
763
7
S7638
S7638
S7638
S7638
S7641
41
S7641
41
S
7
6
42
643
43
S
7
S7644
64
45
S76
S
S
7
6
4
6
S7647
X7501
X7501
P999
P99
99
99
9
R995
95
5
99
R996
9
R996
9
R997
R9
R997
997
R998
9
8
R998
R998
9
8
R998
R
9
999
99
750
50
04
04
L7
L7
NCDIS 8231
31
3
NCDIS-8231
231
NCDIS-8231
CS8
25
1
38
2
3
1
2
TONE
E
TON
-
+
+
PURE
M
U
LTI
DVD
DVD
E
L
ISTENMOD
E
DIS
P
V
IDE
O
VIDEO2
VIDEO2
VIDEO3
D
-
IN
E
TON
E
O
O
O
O
RY
RY
RY
RY
O
O
O
O
MEMO
MEMO
MEMO
MEMO
FM
FM
M
F
F
FM
FM
M
F
FM
TAPE
T
U
NE
R
CD
CD
RET
U
RN
S
ETUP
NTE
NTE
NTE
ER
ER
ER
EN
EN
EN
PRESET-UP
PRESET-U
T
UNING-U
P
TUNING-DN
N
-DN
DN
PRESET-D
UP
WN
DOWN
NC
C
C
IC
IC
IC
C
VDD
D
ST
S
T
RST
ST
CLK
L
K
LK
L
C
DI
I
D
DO
O
O
O
O
O
O
D
GND
N
D
D
D
N
N
N
G
-VP
VP
V
P
P
P
P
NC
NC
C
C
RST
R
T
S
R
T
N
CLK
L
C
C
L
STST
TT
SS
R
TT
DO
O
DO
D
CL
C
L
L
C
C
DI
I
LDY
LDY
LD
Y
H
HP
SYSI
S
SY
S
IN
N
N
C
SI
S
S
S
INN
5
.
6
HP
-
R
HP
HP-G
H
HP-L
G
GND
G
ND
FAC2
F
AC
1
PURE
PUR
U
U
R
STBY
STB
TBY
BY
KEY0
K
EY0
GND
GN
GND
G
N
HP-R
H
P-
G
HP-G
H
P-
L
G
ND
HP-DET
1
1
1
U
7
501
U50
U750
01
U
75
R7504
04
75
5
01
C7
C7
C75
5
0
2
C7
C7
C7503
50
C75
3
C75
0
4
C75
C
7
C7505
05
C
C75
0
6
C7
C7507
07
C75
C7
C
7
750
C7508
C
C
8
750
09
509
C750
C
C7
750
C
751
0
C7511
C
C
5
C75
513
C7
3
C
C
7514
C
7
5
1
5
5
C7516
C
C7517
C
C7521
C
7
5
C7522
C7522
C7523
2
52
5
C
3
D
7
501
7502
7
D
D
D7503
03
7
D
D75
7
D
D750
50
04
04
7505
7505
D7505
D7505
D75
507
D7
D7
J
L7
50
1A
JL7502A
JL
L
7505
A
P
7502
A
503
3
A
P
7
5
Q
Q7
7
501
Q7501
1
Q
75
01
Q
7502
Q7502
50
02
2
Q
Q7
75
Q
Q7503
Q
Q750
03
Q
7504
506
50
06
0
Q75
Q75
Q7507
Q7
Q7507
75
Q
R7513
513
R
51
51
4
4
R75
R75
75
5
01
R7
R7
R7502R7502
R7503
R7503
R7503
R7505
5
R7
R
R7506
6
0
50
50
0
50
06
6
0
R7507
R
507
750
75
7
7
7
0
0
0
R7508
R
0
5
7
8
50
R7
0
0
8
R7509
R
0
5
7
9
50
R7
0
0
9
10
10
0
0
R751
R751
R
R7511
1
R7512
7512
R
R7515
R7
R
7
R7515
5
R7
51
R
7
R7516
6
51
7
1
R7
5
R7516
6
51
7
1
R7
5
R7517
7
1
7
R7517
7
1
7
R7518
8
8
R7519
R7519
R7520
R75
R7520
20
5
21
R75
R
R
R
R7522
R7
2
52
R7522
23
23
23
23
3
3
3
3
R752
R752
R752
R752
24
2
R7
5
R
R
R7526
75
R7527
7527
R7527
7
R7527
75
R7528
R
R7529
R7529
529
R7530
7
R7530
R7
R7531
3
R
R7531
3
R7
R7532
3
75
R7580
R7580
80
80
75
75
R
R
R7581
R7581
8
8
7
7
R7582
R7582
5
R
2
R7
6
1
1
R
7
6
1
2
3
3
R7613
R7613
R7621
2
R7
R7622
R
7
6
2
3
R
7624
R
762
5
R
7
6
2
6
31
31
1
1
R76
R76
2
R
763
2
R7633
7633
R
7
7634
R
7
7635
R7
636
R7637
6
R
7
6
41
R7
6
4
2
R7643
R
R7
R
7644
4
64
R
R
764
5
R7646
7646
S7501
0
1
S7501
S7611
S7612
S7612
76
S7612
S7613
13
S76
613
S76
S7614
S761
4
S
7621
2
S7622
S7622
S7623
S7623
S
7624
S
7625
S7626
S7626
S7626
S
S
S
S7627
S76
S7627
S762
S
7
631
S
763
2
S
7
633
S
7
63
4
S
7
635
S7636
S
S
S
763
7
S7638
S7638
S7638
S7638
S7641
41
S7641
41
S
7
6
42
643
3
S
7
S7644
64
45
S76
S
S
7646
S7647
X7501
X7501
P999
P99
99
99
9
R995
R9
R
R99
R996
99
R996
99
R997
99
R997
R99
R998
9
R
R998
R998
9
R
R998
R
9
999
99
750
50
04
04
L7
L7
31
31
NCDIS-8231
231
NCDIS 8231
CS
25
1
38
2
3
1
2
TONE
E
TON
-
+
PURE
M
U
LTI
DVD
DVD
E
L
ISTENMOD
E
DIS
P
V
IDE
O
VIDEO2
VIDEO2
VIDEO3
D
-
IN
E
TON
E
O
O
O
O
RY
RY
RY
RY
O
O
O
O
MEMO
MEMO
MEMO
MEMO
FM
FM
M
F
F
FM
FM
M
F
FM
TAPE
T
U
NE
R
CD
CD
RETURN
S
ET
U
P
NTE
NTE
NTE
ER
ER
ER
EN
EN
EN
P
PRESET-U
T
UNING-U
P
TUNING-DN
N
-DN
DN
PRESET-D
UP
WN
DOWN
NC
N
N
IC
IC
IC
C
VDD
V
RS
S
RST
RS
CLK
C
C
CL
C
LK
DI
D
D
DO
D
D
D
D
O
GND
N
G
G
G
N
N
N
D
-VP
-V
VP
-
V
V
NC
NC
N
C
C
RST
T
R
S
ST
R
C
C
C
C
CLK
L
K
K
L
RSRS
RR
S
SS
RR
DO
D
DO
O
LK
LK
L
L
K
K
DI
D
LDY
LDY
DY
L
P
HP
YSIN
N
SIN
YS
SY
C
C
N
YSYS
YSYS
SY
SY
5
.
6
HP
-
R
-G
HP-G
L
HP-L
ND
GND
G
ND
FA
C2
F
AC1
PURE
PUR
U
U
R
STBY
STB
TBY
BY
KEY0
0
KEY
GND
ND
GND
N
D
HP-R
H
P-G
HP-G
HP
-
L
G
ND
HP
-
DET
1
1
1
U
7
501
U750
01
U
75
R7504
R7
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2