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Yamaha A-s300 Service Manual

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    							MAIN (2) P.C.B.
(Side B)
MAIN (5) P.C.B.
(Side B)
A-S300 (J model)
MAIN (6) P.C.B.
(Side B)
R model
ABCDE FGH I J
1
2
3
4
5
6
7A-S500/A-S300
51
• Semiconductor Location
Ref no. Location
D16 D6
D18 G5
D19 H5
D20 H5
D21 H5
D23 G5
Q11 D6
A-S500
A-S300
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    							W301
W302
IC309
IC311CB302
IC301
CB303
CB301DOCK
DOCK P.C.B.
(Side A)
1
35
4
-15+15
AGND_VIDEO
SIRILSIRIR
AGND_DOCK
DOCKLDOCKR
+7I
IGNDVRG+5MTR
MGSIRI_MISOSIRI_MOSIUAW_PONDOCK_TYPIPD_N_VONIPD_MOSI
+5.5SUBPRVIPD_APDETDOCK_PONSIRI_PONIPD_N_DETIPD_MISO
148
1 5
4
OPERATION (1)
(CB21)
OPERATION (9)
(CB854)
FUNCTION (1)
(CB511)
FUNCTION (1)
(CB508)
No replacement part available.
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    							A
1
2
3
4
5
6
7
8
910BCDE FGH I J K
L
MN
53
FUNCTION 1/2
A-S500/A-S300
SCHEMATIC DIAGRAMS★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.Ô?yxzº
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CB403
CB504
CB503
CB505
W502W503CB511 CB515CB510 W401
CB513
W504
CB506
CB508
CB405 CB404
CB504
CB502
CB509
IC502
IC401
IC503 IC501
IC402IC507
CD INVOL OUT
5.0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00 0 2.9
5.0
5.0
5.1
0
0
0
0
0
0
0
0 0
0
0
0
0 0.2
5.0
5.0
5.0
5.01.7
0.9
5.0
5.0
5.0 0
0
0
0
0
0
0
0
0
0
0
0
0 05.0
5.0
5.0
5.0
5.0
4.95.05.0
5.0
5.0
15.5
-15.3
2.9 2.9
5.0
5.6 5.1
00 15.5
-15.3
0
0
0
0
0
0
0
0
0
0
0
0
0
0 15.5
-15.30
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15.5
-15.3
02.6
2.45.05.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0-5.02.8
3.7 4.90.4
5.6 5.0
5.6 05.6 5.0
5.0
5.0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-7.2
0
7.30
0
0
0
0
0
0 0
0
0
0
0
0
0
0
0
0
0
0 0
0
0
0
0
0
0
0
0
0
0
0
000
0 0
0
015.5
15.5
-15.3
-15.3
0
0
0
0
0
0
0 0
0 0 0 0 0 0
0
0 15.5
15.5
-15.3
-15.3
0
0
0
0
0
0
00
00
0
0
0
0
0
0 5.0
0
0
5.0 5.0
0
5.0 5.00 5.0
5.05.0 0 4.9 0 2.90 1.65.0 0
0
0
0
0
0
0 2.8
5.0
5.0 2.9
3.75.0
5.0
5.0
1.61.0 1.05.0
0
0
0
0
0
0
0
0
0
0 0
0
0
0
0
0
0 5.0
5.0 02.9 5.6
5.0
4.9
5.0
5.00
0 1.0
1.01.6
5.0
5.0
4.9
4.9 5.05.0 0
0
00
15.5
7.9
-7.80
0 7.3
-15.3 -7.2 0 0
00 0
0
POINT  A  XL501 (Pin 13 of IC502)
A 1
B2
1 IC502
(+5M)
IC502
(N_RST)2
1 IC502
(+5M)
IC502
(N_RST)2
AC POWER ON
(Connect the power cable)AC POWER ON
(Connect the power cable) AC POWER OFF
(Disconnect the power cable)
POINT  B   1 / IC502 (99 pin, +5M),  2 / IC502 (12 pin, N_RST)
IC503: LE24C023M-TLM-E
Two wire serial interface EEPROM
Write controller WP
SCL
SDA8 NC
NC
NC
GND1
7 2
6 3
5 4 SDASCL WP VDD
I/O Buffer
Input Buffer
Condition detector
Serial controller
Address generator
X decoder
High voltage generator
Y decoder and Sense AMP
Serial-Parallel converterEEPROM Array
IC401: R2A15220FP8-channel electronic volume with 11 input selector and tone control51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
80
81 79 MUTE
A VEE
ADCL
ADCR
AGND
INR1
INR2
INR3
INR4
INR5
INR6
INR7
INR8
INR9INL1
INL2
INL3
INL4
INL5
INL6
INL7
INL8
INL9
INR12
INL12
INL14
RECR3
RECL3 INL11/RECL5
INR13
INR14INL13
FLIN1
FRIN1
CIN1
SWIN1
SLIN1
SRIN1
SBLIN1
SBRIN1
SBLC
SBL Pre-OUT
SBL OUT
INRA/RECR1
INLA/RECL1
INRB/RECR2
INR10/RECR4
INR10/RECL4
INR11/RECR5INLB/RECL2
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
1 2FRC
FROUT
FLOUT
FLC
CC
COUT
SWOUT
SROUT
SLOUT
SBR OUT SBR Pre-OUT SL Pre-OUT SR Pre-OUT FL Pre-OUT FR Pre-OUT
SBRC SWC
SRC
SLC AGND AGND
A GND
AGND AGND TREL TRER
BASSL2 BASSR1 BASSR2
BASSL1
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99 100
50AVEE
0/-6/-12/-18dB
AT T
SUBSUB2
0~95dB,
-∞
(0.5dBstep) MAIN
MAIN
MAIN SUBSUB
CLOCK D ATA
DGND
SUBR1
SUBL1
SBLCIN
SBRCIN
FRIN2
FLIN2
SRIN2
SLIN2
SWIN2
SBRIN2
SBLIN2
SLCIN
SRCIN
SUBR2
SUBL2
AVC C CIN249
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
MCU
I/F
AVC C
REC
Tone ToneBass/Treble
-14~+14dB
(2dBstep)+42~0dB
(0.5dBstep)
+42~0dB
(0.5dBstep)
+42~-95dB
-(0.5dBstep)
+42~-95dB
-∞(0.5dBstep)
+42~-95dB
-∞(0.5dBstep)
+42~-95dB
-∞(0.5dBstep)
+42~-95dB
-∞(0.5dBstep)
+42~-95dB
-∞(0.5dBstep) Bass/Treble
-14~+14dB
(2dBstep) 0~-95dB,
-∞
(0.5dBstep)
Bypass
BypassTone+MIX
Tone+MIXTone
Tone
VDDCE
Vref
43
12
Current Limit
VOUTGND
Pin No.
1
2
3
4Symbol
V
OUTGNDCE
VDD
Description
Output Pin Ground Pin Chip Enable ("H" Active)
Input Pin
IC501, 507: RP130Q501D-TR-F
Voltage regulatorIC502: R5F364A6NFA
Single chip 16-bit microprocessor
Timer (16-bit)
Internal peripheral functions
Inputs (timer B): 6
Three-phase motor control circuitOutputs (timer A): 5Watchdog timer
(15-bit)
Remote control signal
receiver 
(2 circuits)
PWM function (8-bit x 2)CEC functionReal-time clock
VCC1 ports VCC2 ports
 
A/D converter
(10-bit resolution X 26 channels)
System clock generator
PLL frequency synthesizer
On-chip oscillator (125 kHz)X
IN-XOUT
XCIN-XCOUT
Port P0
8
Port P1
8
Port P1
8
Port P3
8
Port P4
8
Port P5
8
Port P10
8
Port P9
8
Port P8
8
Port P7
8
Port P6
8ISPUSPINTBSB
CRC arithmetic circuit
(CRC-CCITT or CRC-16)DMAC (4 channels)
Voltage detecter
On-chip debuggerPower-on reset
Multiplier
MemoryROM RAM
FB A1
FLGPC
UART or
clock synchronous serial I/O
Clock synchronous serial I/O
Multi-master I2C-bus interface
(6 channels)
(8 bit x 2 channels)
(1 channel)
D/A converter(8-bit resolution X 2 circuits)
M16C/60 series
Microprocessor core
R0L R0H
R1H R1L
R2
R3FB A1 A0
LINERECPB
PB
REC
FUNCTION (2)
FUNCTION (1)
MICROPROCESSORR516
A-S500
A-S300
4.7K
8.2K
A-S500/A-S300 A-S300 A-S500
123TUNER
A-S300
to OPERATION (2)_W807Page 55
B5
to OPERATION (2)_CB802Page 55
B7
to OPERATION (5)_W812Page 55
J3
to OPERATION (9)_CB853Page 55
J8
to MAIN (1)_W105 Page 57
H9
to MAIN (1)_W105 Page 59H9
to MAIN (6)_CB14 Page 58
K6
to MAIN (6)_CB14
(A-S300) (A-S500)
Page 60K6 to OPERATION (1)_CB2Page 56
G7
to DOCK_CB302 Page 61
F10
to FUNCTION (3)_CB602Page 54
G6
to OPERATION (9)_CB851Page 55
L6
to FUNCTION (3)_CB601
(J model) Page 54
G4to DOCK_CB303 Page 61
I3
Writing port(A-S300) (A-S500)
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    							A
1
2
3
4
5
6
7
8
9
10BCDE FGH I J K LMN
A-S500/A-S300
54
FUNCTION 2/2★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.Ô?yxzº
æ
Å .
w?y-p`h‹wpb{
Ô/ ¹wK”
æ
¼xz†
¶
Q¬-
æ
¼›Ô`oM‡b{
æ
¼w¦õU
žAs	Ôùz
Í”ÀæµÄtGL^•oM”
æ
¼›–;`oXi^M{
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$x
ª	jsÏ
$pb{~‘whŠsX!Ëb”\qUK“‡b{
CB603
CB604
W601 JK601
JK602
JK603
JK604
W602
IC601
IC601
IC602
IC602
IC603
IC603CB601
CB602
CD IN
15.5
-15.3
0
0
0
0 0 13.4
0
0
0
-13.2 0
00
0
0
0
0
0
0
0
0
0
IC601: NJM2068MD-TE2
Dual operational amplifier
OUT
1
OUT
2
–IN
1
+IN
1
+IN
2
-IN2
–VCC
+VCC
1
2
3
48
7
6
5
+
–+
–
FUNCTION (3)
PHONOCD
EQ AMP
A-S300to FUNCTION (1)_CB510Page 53
H8 to FUNCTION (1)_CB515
(J model) Page 53
I8
to MAIN (5)_CB5
(J model) Page 59
B2
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    							A
1
2
3
4
5
6
7
8
910 BCDE FGH I J K
L
MN
55
OPERATION 1/2
A-S500/A-S300
★
  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★   Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★   Schematic diagram is subject to change without notice. Ô?yxzº
æ
Å .
w?y-p`h‹wpb{
Ô/ ¹wK”
æ
¼xz†
¶
Q¬-
æ
¼›Ô`oM‡b{
æ
¼w¦õU
žAs	Ôùz
Í”ÀæµÄtGL^•oM”
æ
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$x
ª	jsÏ
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CB803 W802
W812JK701
CB706
CB951
CB902
IC901
IC901
CB901
CB804
W804
W803
W801 W805A
W806A W806B CB853
CB854
CB855
CB852
IC851 CB851
CB856
W805B
CB808
CB802 W809A
W807
W808
IC801
IC801
IC802 IC802
W809B
0 0
15.5
0
0 0
0 0 0
0
0
5.0
5.0
5.0 5.0
0
0
0 0
0
0
0 0
0 0
0
3.6 5.0
0
0
3.6
5.0
0
0
3.6
5.0
0
0
3.6
5.0
0
0
3.6
5.0
0 0
00
0
3.6 5.0
0
5.0
0
1.9
0
0
15.5
-15.3
0 0
0
0
0
15.5
-15.3
0 0
0
0
0
0
0 0 4.9 0 0 0
0
0
0
15.5
-15.3 0
0
0 0.7
0.7
0 0
0
0
0
0
0
5.0 5.0
5.0
5.0
5.0 0
00
0.6 1.2
0
5.0
5.0
5.0 3.2
5.0 5.0
5.0
0
5.0 5.0
5.0
5.0 0
3.7
2.8 5.0
5.0 5.0
5.0
5.0
5.0
5.0 3.8
2.8 0
5.0
5.0
5.0
5.0
0 3.7
2.8
0
15.5
-15.3
0 0
-15.3
0
0
0
00
0
0
0
0
15.5
0
0 0
-15.3 0 0
0
0
0
0
 5.0
5.0
-15.315.5
-15.3 15.5 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5.1
0
0
0 00
0
0
5.1
0.8
0.6 5.1
0.6 0.6
0.60.8
0.4
0
0 0
0
0
0
5.0
5.0
5.0
5.0
5.0
5.0 5.0
OUT L
TONE IN
TONE OUT
VOL OUT
IC851
: LB1641
Motor driver
INPUT LOGIC
IN 1
IN 2 VZ
P1
P2 OUT 1
OUT 2 VCC 2
VCC 1
GND
PRE DRIVER
1328
1097
4
6
5
IC802, 901
: NJM2068MD-TE2
Dual operational amplifier
(IC802: U, C, R, T, A, L models) (B, G, J models)
OUT
1
OUT
2
–IN1+IN1
+IN2-IN2
–VCC
+VCC
1
2
3
4 8
7
6
5
+
– +
–
IC802 : NJM5532M-D
Dual low noise operational amplifierA OUTPUT
A-INPUT
A+INPUT
V- B OUTPUT
B-INPUT
B+INPUT V+
1
2
3
4 8
7
6
5
+
– A
B
+ –
PHONES
LOUDNESS
TREBLE
BASS
INPUT
BALANCE
VOLUME
REC OUT INPUT indicators
PHONO DOCK TUNER DC LINE1 LINE2 LINE3
SPEAKERS
OPERATION (5)
OPERATION (8)
OPERATION (4)
OPERATION (3)
OPERATION (2)
OPERATION (6)
OPERATION (9)
OPERATION (10)OPERATION (11)
A-S500 A-S500
A-S300PURE DIRECT
indicator
POWER
indicator
PURE DIRECT
(POWER)
A-S300
to FUNCTION (1)_CB504Page 53
H2
to OPERATION (1)_W1A, W1B (J model)
Page 56
K4
to FUNCTION (1)_CB503 Page 53I2 to FUNCTION (1)_CB505
Page 53
J2
to FUNCTION (1)_W504 Page 53
L4
to DOCK_W302
Page 61L8
to MAIN (1)_CB108
Page 57
G9
to OPERATION (2)_W808Page 55
B4
to FUNCTION (1)_W401Page 53
D8
to OPERATION (9)_CB852 Page 55
K6
(A-S500)
to MAIN (1)_CB108 Page 59
G9
(A-S300) to MAIN (6)_W10
Page 58
B4
to MAIN (6)_W10
Page 60B4
(A-S300) (A-S500)
to MAIN (1)_CB101 Page 57
A6
to MAIN (1)_CB101Page 59
(A-S500)
(A-S300)
A6
    Add page 56 to Favourites
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    							A
1
2
3
4
5
6
7
8
9
10BCDE FGH I J K LMN
A-S500/A-S300
56
OPERATION 2/2
★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.Ô?yxzº
æ
Å .
w?y-p`h‹wpb{
Ô/ ¹wK”
æ
¼xz†
¶
Q¬-
æ
¼›Ô`oM‡b{
æ
¼w¦õU
žAs	Ôùz
Í”ÀæµÄtGL^•oM”
æ
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ÔŠsÏ
$x
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CB10
CB9 CB8
CB3IC4CB4
CB16
IC1IC2 W1A
W1B
IC3 CB2 CB17
CB21
(7.5)(7.5)
(3.6)
(0)
(0)
(0)
(0) (3.2)(3.2)
(7.3)(3.6)
(0)(0)(0)
(0) (0) (0.2)
(0.2)
(0)
(0) (1.0)
(0)(7.3) (7.5) (7.5)
(1.1)
(7.3)0 (7.3)
4.4
4.5
9.2
0 0 3.6 9.2
0.7
0 0
0 0.2 0.2 0.2
0
0
0 00
00 5.0 0
9.2 4.7
5.0
5.1
5.65.6 5.2
09.2
0.8 0.2 5.6
5.6
0
9.25.0
5.1 5.05.0 5.1
7.0
0.2
09.2
Primary side ground
AC9.1
0 10.2
4.7
0 10.2 4.3
AC8.4
IC4: TC4013BP
Dual D-type flip flop4
RESET1
1Q1
6
SET1
5
D ATA 1
CL
3
CLOCK1
CL CL
CL
CL
CL
2Q1
10
RESET2
13Q2
8
SET2
9
D ATA 2
7
VSS
14
VDD
11
CLOCK2
12Q2
CL
CL
CL
CL
CL
CL
1234
1112 13 14
567
8 9 10
Vss SET2CK2 VDD
Q2
INPUTS OUTPUTS
  : Don't care
  : Level change
˙  : No change
RESET
L
H
H
L
L
L Q2
D ATA 2 RESET2
SET1 RESET1CK1Q1 Q1
D ATA 1
SET
H
L
H
L
L
L
D ATA
L
H
CK
Qn + 1
H
L
H
L
H
Qn˙
Qn + 1
L
H
H
H
L
Qn˙
IC1: R1190H055B-T1-FE
Voltage regulator
VDDCE
Pin No.
1
2
3
5
6Symbol
V
OUTGND
CE
GND
VDD
Description
Output Pin
Ground Pin
Chip Enable Pin ("H" Active)
4 DELAY Delay Pin (for setting Inrush Current Limit Time)
Ground Pin
Input Pin VrefThermal Shutdown
61
3 2,5
Inrush
Current
LimitPeak
Current
Protection
Short
Protection
VOUTGND
4
DELAY
OPERATION (7)
OPERATION (1)
R model
SUB-
TRANSFORMER POWER
TRANSFORMER
A-S300
VOLTAGE SELECTOR 220V – 240V 110V – 120V
to POWER TRANSFORMER
to FUNCTION (1)_W503Page 53
J8 to DOCK_W301 Page 61
L7
to POWER TRANSFORMERto POWER TRANSFORMER
(U, C, R, T, A, B, G, L models)
to AC IN
to OPERATION (2)_W809A, W809B
(J model) Page 55
B6to MAIN (5)_CB8
(J model) Page 59
B2
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910BCDE FGH I J K
L
MN
57
MAIN 1/2
A-S500/A-S300
★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.
W104
CB104
CB15 CB15
CB8
CB101
CB108
W101
W105
W103 W102
CB107CB106 IC103 IC103
IC102 IC101
OUT L
SUBWOOFER OUT
0
0
0
0
0 38.2
-38.2
21.9
-21.8
2.9
0
19.50 12.7
11.1-38.20 38.2
0 0
0
0
0 5.0 0
0 5.0 20.2
19.520.9
12.0
-21.820.2
12.012.6
11.3
11.3
-21.8 11.1
-21.8 -21.8
-21.820.9
12.0
12.0 53.3
(41.8)
(-41.7)-53.30
0
0
0
AC77.9AC61.2
1.0
5.0 5.0
1.0
0 0
0
0
0
0
0
1.6
5.0
5.0
5.0 5.0 1.0
1.0 0
0
0
-15.2
-15.215.5
-15.4
-15.2 0
0
0 0
0
0
-15.215.5
00-15.2
1.0
0 5.0 0
1.0
5.0
0 53.4
52.8
52.8
52.2
0.752.2
52.2
-1.0 52.8
1.2
0
0 0 1.21.253.4
53.453.4
53.453.1
53.1 0.6
-53.3 0
0
00
0
-0.5
-53.3-0.5
-1.0 -0.41.0
-1.0
-51.5-1.0 -0.7
0 -0.7
-52.2
-52.2
-52.2 -52.1
-52.8 -52.1
-52.8 -52.2 -52.1 0
-52.1
0
0
0
0-52.1-51.6
-52.10.6
-51.5-52.1
1.2 -52.1
-1.0
0
0 0
-1.0-1.0-53.3
-53.3
-0.5
53.4 00
00
53.1 0
0.6
53.40.6
1.2 -0.4
1.2 -1.0
52.3
52.3
52.8
53.41.2 0.70
0.7-52.2
0.7
52.2
52.8-52.2 -52.2
-52.1-52.1 -52.8
-52.2 -52.8
-52.1
0
52.8-0.5
I C 101 , 10 2: LM61CIZ
Temperature sensor
V+
–INPUT
+INPUT
V–OUTPUTIC103: NJM4580E
Dual operational amplifier
8
2, 6
3, 51, 7
4
SPEAKERS A
A B B
SUBWOOFER
OUT
POWER
MANAGEMENTIMPEDANCE
SELECTOR
MAIN (1)
MAIN (4)MAIN (3)
MAIN (2)
LPF
Note) Those parts marked with “#” are not included in the P.C.B. ass’y.
# # # #
to POWER TRANSFORMER
to FUNCTION (1)_CB506Page 53
L4to MAIN (6)_CB13 Page 58
K3
to OPERATION (2)_W804Page 55
F5 to OPERATION (2)_W803Page 55
F5
Notes)
Safety measures
t4PNFJOUFSOBMQBSUTJOUIJTQSPEVDUDPOUBJOIJHIWPMUBHFTBOEBSFEBOHFSPVT#FTVSFUPUBLFTBGFUZNFBTVSFTEVSJOHTFSWJDJOH
TVDIBTXFBSJOHJOTVMBUJOHHMPWFT
t/PUFUIBUUIFDBQBDJUPSTJOEJDBUFECFMPXBSFEBOHFSPVTFWFOBGUFSUIFQPXFSJTUVSOFEPGGCFDBVTFBOFMFDUSJDDIBSHFSFNBJOTBOEBIJHIWPMUBHFDPOUJOVFTUPFYJTUUIFSF
#FGPSFTUBSUJOHBOZSFQBJSXPSL
DPOOFDUBEJTDIBSHJOHSFTJTUPS	LPINT8
UPUIFUFSNJOBMTPGFBDIDBQBDJUPSJOEJDBUFECFMPXUPEJTDIBSHFFMFDUSJDJUZ5IFUJNFSFRVJSFE
GPSEJTDIBSHJOHJTBCPVUTFDPOETQFSFBDI
$BOE$PO.*/	
1$#
5 k-ohms
10 W
5 k-ohms
10 W
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10BCDE FGH I J K LMN
A-S500/A-S300
58
MAIN 2/2★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.
CB26
CB13
CB19
CB14
CB25
CB11
CB12 W10
0
0
0
00
-21.8 21.9
038.2
27.0
27.0
-15.4 -16.6 16.7
-16.6
-17.015.5 38.2
-38.2
21.9
-21.8
2.90
0
0
0
-15.4
2.9 0
-27.40
0
-27.0
-21.816.715.5
27.821.9
-38.2 0
0
AC33.4
MAIN (6)
to FUNCTION (1)_W502Page 53
K8 to OPERATION (8)_CB706Page 55
K2to MAIN (1)_W104 Page 57
I2
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MN
59
MAIN 1/2
A-S500/A-S300
★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.Ô?yxzº
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W104
CB104
CB15 CB15
CB8CB5
CB101
CB108
W101
W105
W103 W102
CB107CB106 IC103 IC103
IC102 IC101
OUT L
SUBWOOFER OUT
0
0
0
0
0 37.4
-37.4
22.3
-22.2
2.8
0
19.90 13.1
10.4-37.40 37.4
0 0
0
0
0 5.0 0
0 5.0 20.6
19.9
19.920.6
12.4
-22.020.6
12.9
11.7
11.7
-22.2 10.4
-22.2 -22.0
-22.220.6
12.4
12.4 50.7
(41.6)
(-41.5)-50.50
0
0
0
AC74.2AC60.9
1.0
5.0 5.0
1.0
0 0
0
0
0
0
0
1.5
5.0
5.0
5.0 5.0 1.0
1.0 0
0
0
-15.2
-15.215.5
-15.3
-15.2 0
0
0 0
0
0
-15.315.5
00-15.2
1.0
0 5.0 01.0
0
1.0
0 1.0
5.0
0 50.7
50.1
50.2
49.6
0.649.6
49.6
-1.1 50.1
1.1
0
0 0 1.11.150.7
50.750.7
50.750.7
50.4 0.6
-50.6 0
0
00
0
-0.5
-50.6-0.5
-1.1 -0.51.1
-1.1
-51.5-1.1 0.6
0 0.6
-49.5
-49.5
-49.5 -49.5
-50.1 -49.5
-56.1 -49.5 -49.5 0
-49.4
0
0
0
0-49.5-48.8
-49.40.6
-49.4
-49.5
1.2 -49.4
-49.8
-1.0
0
0 0
-1.0-1.0-50.6
-50.6
-0.5
50.7 00
00
50.4 0
0.6
50.70.6
1.2 -0.4
1.1 -1.0
49.4
49.4
50.1
50.71.2 0.60
0.6-49.5
0.6
49.6
50.2-49.5 -49.5
-49.5-50.1
-49.5 -49.5
-49.5
0
50.2-0.5
63

I C 101 , 10 2: LM61CIZ
Temperature sensor
V+
–INPUT
+INPUT
V–OUTPUTIC103: NJM4580E
Dual operational amplifier
8
2, 6
3, 51, 7
4
SPEAKERS A
A B B
SUBWOOFER
OUT
POWER
MANAGEMENTIMPEDANCE
SELECTOR
MAIN (1)
MAIN (4)MAIN (3)
MAIN (2)
MAIN (5)
J model
LPF
Note) Those parts marked with “#” are not included in the P.C.B. ass’y.
 
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10BCDE FGH I J K LMN
A-S500/A-S300
60
MAIN 2/2★  All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★  Components having special characteristics are marked 
/  and must be replaced 
with parts having specifications equal to those originally installed.
★  Schematic diagram is subject to change without notice.Ô?yxzº
æ
Å .
w?y-p`h‹wpb{
Ô/ ¹wK”
æ
¼xz†
¶
Q¬-
æ
¼›Ô`oM‡b{
æ
¼w¦õU
žAs	Ôùz
Í”ÀæµÄtGL^•oM”
æ
¼›–;`oXi^M{
ÔŠsÏ
$x
ª	jsÏ
$pb{~‘whŠsX!Ëb”\qUK“‡b{
CB26
CB13
CB19
CB14
CB25
CB11
CB12 W10
0
0
0
00
-22.2 22.3
037.3
26.2
26.2
-15.3 -16.6 16.7
-16.7
-26.215.5 39.4
-37.4
22.3
-22.2
2.80
0
0
0
-15.3
2.9 0
-26.80
0
-26.2
-22.216.715.5
26.822.3
-37.4 0
0
AC34.1
MAIN (6)
A-S300
to FUNCTION (1)_W502Page 53
K8 to OPERATION (8)_CB706Page 55
K2to MAIN (1)_W104 Page 59
I2
to POWER TRANSFORMER
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