How it Works
Yamaha
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A-S2000
Owner's Manual
35 pgs5.49 Mb0
Owners Manual
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Owners Manual
30 pgs2.39 Mb0
Owners manual
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Owner's Manual
82 pgs23.77 Mb0
Schematic
9 pgs5.45 Mb1
Service Manual
90 pgs15.06 Mb0
User Manual
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User Manual
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User Manual [ru]
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Yamaha AS-2000 Schematic

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Page 1
ABCDEFGH I J
1
■ BLOCK DIAGRAM
A-S2000
BALANCE
FRONT
2
• See page 64-66 → SCHEMATIC DIAGRAM
3
4
• See page 59 → SCHEMATIC DIAGRAM
CD BAL L/R
RY101
PHONO
L/R
RY_MMHC
CD L/R
TUNER L/R
LINE1 L/R
LINE2 PB L/R
LINE2 REC OUT L/R
PRE OUT
MAIN IN
HOT (POSITIVE PHASE)
COLD ( NEGAT IVE PHASE )
Q1001-1016
MC
HEAD AMP
RY102
MM/MC
Q1017-1038
EQ AMP
IC301
BUFFER AMP.
RY_PHONO
POL/POR
RY103
RY_CD
RY_TU
RY_L1
RY_L2
BUFFER AMP.
RY UNBAL
IC201
INPUT BUFFER
HOT(+)
COLD(-)
INPUT SELECTOR
RY_BAL
RY306
RY305
HOT(+)
COLD(- )
VOLUME & TONE CONTROL
IC410
ATT.1
IC411
ATT.2
IC412
ATT.3
IC407
ATT.4
IC408
ATT.5
IC409
ATT.6
IC404
IC405
IC406
IC401
IC402
IC403
TONE CONT ROL DEVICES
FLAT
TONE CONT ROL DEVICES
FLAT
FUNCTION
RY_BYP
RY402
RY401
LINE AMP.
IC413
IC302
IC303
• See page 60-62 → SCHEMATIC DIAGRAM
HOT(+)
COLD(-)
RY_DIR
RY404
MAIN DIRECT
RY403
FLOATING BALANCED
POWER AMPLIFIER
SPEAKER DRIVER
HOT (POSITIVE PHASE) SIDE
SPEAKER DRIVER
COLD (NEGATIVE PHASE) SIDE
PRD PRI THM
RY501
FRONT
SPCH A L/R CH
RY201/R111
SPCH B L/R CH
RY202/R112
RY_SPA RY_SPB
to POWER AMP.
• See page 64-66 → SCHEMATIC DIAGRAM
SPEAKERS L/R CH
+
A
-
+
B
-
R CH
PRD
THM
RY_DIR
RY_BYP
RY_UNBAL
5
RY_PHONO
LED_PWR
54 34 32RY_BAL 26RY_CD 27RY_TU 28RY_L1 29RY_L2 55RY_MMMC 56
25
REM
53 2,3
39
HPTRIM
SP_AB
6
HP_PRD48PSVA147PSVA2
1,64
62,63
IC502
MICRO
PROCESSOR
46
IC501
14
15
5I_BAS
4
I_TRE
2I_SEL
12
I_LRBAL
BALANCE UNBALANCE
60 PRV1 PRV
17
16 RY_PWR
35
RY_HP
4
RY_SPA
5
RY_SPB
41-43A/B/C
9-113,4
1I_VOL
36,37MVOL+/-
+20V/-20V
+25V/-25V
For EQ AMP
For MC AMP
INDEPENDENT REGULATED POWER SUPPLY (for AUDIO)
PDET
+25V/-25V
For LINE AMP1
For LINE AMP2
SUB-TRANSFORMER
T1
+25V/-25V
For VOLUME1
+12/-12V
+33V
-33V
+12V/-12V
For VOLUME2
(for POWER AMP / VOLTAGE AMP STAGE)
PRV
D305
PRV
D304
CONVERTER
POWER TRANSFORMER
LOW IMPEDANCE DRIVE
HEADPHONE AMP.
FLOATING POWER SUPPLY
POWER SWITCH
for MICROPROCESSOR
RY1
HP END
INDEPENDENT
D335
D336
D300
AC IN
SPEAKER
TREBLE
BALANCEBASSTRIM
REMOTE
7
FRONT
• See page 64-66 → SCHEMATIC DIAGRAM
FRONT PANEL
INPUT SEL
VOLUME
VR501
FUNCTION
• See page 60-62 → SCHEMATIC DIAGRAM
PRV
D301
D306
RY_HP
L CH
for HOT
L CH
for COLD
R CH
for HOT
R CH
for COLD
IC51
IC52
+B3/-B3
+B4/-B4
+B1/-B1
+B2/-B2
PSVA1 PSVA2
+12V
to SPEAKERS RELAY
-12V
JK501
MAIN
• See page 63 → SCHEMATIC DIAGRAM
FUNCTION
• See page 60-62 → SCHEMATIC DIAGRAM
37
Page 2
A
BCDEFGH I JK
L MN
SCHEMATIC DIAGRAMS
A-S2000
BALANCE
1
2
25.2
24.6
5.8
5.8
3
0
0.3
6.4
6.4
0.3
25.7
5.8
5.8
0.3
24.6
-24.5
0.6
0
1.0
-24.5
-25.0
-25.7
-0.8
1.0
0.4 1.0
-0.2
-25.1
CD BAL L
25.7
1.0
0.4
-0.2
-0.8
-25.4
CD BAL L
W2001
CB203
Page 66
H2
to FRONT (12)_CB59
Page 62
H8
to FUNCTION (3)_W3
-24.5
-25.7
0.5
24.6
0
-25.0
1.0
25.2
1.0
-0.8
-24.5
0.4
1.0
-25.1
1.0
-0.8
25.7
-0.3
-25.4
0.4
0
0
IC201
12.6
0
-12.5
4
JK202
24.6
5.8
5.8
0
0.3
6.3
6.3
0.3
25.7
5.8
5.8
0
0.3
5
Page 60 K2
to FUNCTION (1)_W3005
6
CB201
25.2
25.7
24.7
0.6
1.0
1.0
1.0
0.4
-0.2
0
-0.8
-25.1
-24.5
1.0
-0.8
0.4
-0.3
-25.4
24.7
7
5.8
5.8
0
0.3
CD BAL R
6.3
25.7
5.8
5.8
0.3
-25.7
0
-24.5
-25.0
0
0
IC201
0
-11.9
CB202
IC201: NJM2068MD-TE2 Dual operational amplifier
-11.9
Page 60 K2
to FUNCTION (1)_W3006
OUT1
–IN1
+IN1
–VCC
1
2
+–+
3
4
+VCC
8
OUT2
7
–
6
-IN2
5
+IN2
8
25.2
25.7
1.0
0.4
-0.2
-0.7
-25.4
-24.5
24.7
0
0.5
-24.5
-25.0
1.0
1.0
0.4 1.0
-0.2
-0.7
-25.1
JK201
9
24.7
5.8
5.8
0
0.3
6.4
6.4
0.3
25.7
5.8
5.8
0
0.3
10
-25.7
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
59
Page 3
A-S2000
A
BCDEFGH I JK
L MN
1
FUNCTION 1/3
W3006
CD BAL L
Page 59
2
W3005
25.1
-24.5
-24.8
24.6
1.1
25.7
1.1
0.5
-0.1
-0.6
-0.6
0.9
0.3
0
-0.9
-25.6
25.7
1.1
0.6
0
-0.6
-25.6
24.6
25.7
24.6
6.4
CD L
3
Page 65
to FRONT (10)_W1002
M5
CB301
12.0
-11.9
5.8
5.8
5.8
0
0.3
0.3
5.8
0
0.3
0.1
0.3
24.6
5.8
25.6
6.3
5.8
0.3
0.3
0.9
0.9
0.9
1.0
0
0.2
1.1
-24.5
-0.4
-0.9
-0.9 -25.0
-25.6
0.5
0
0
4
25.7
0
-11.9
-11.9
W3003
IN L
25.7
0.6
0.6
W3001
to BALANCE_CB202
Page 59
to BALANCE_CB201
Page 61
to FUNCTION (2)_CB403
I7
I5
J4
-11.9
-11.9
25.1
24.6
25.7
5
-11.8
-11.9
6
-11.9
-11.9
24.6
6.4
5.8
5.8
5.8
0
0.3
0.3
5.8
0
25.7
5.8
0.3
0.1
0.3
0.3
1.3
24.6
6.3
5.8
0.3
0.9
0.9
0.9
0.1
0.3
-0.3
0
-0.9
-0.9
-24.5
24.6
25.2
1.1
25.7
-0.9
0.9
0.3
0.3
-25.6
1.1
0.5
1.1
0.5
0.5
0
0
-0.6
-0.6
-25.1
-24.8
-24.5
1.1
-0.6
25.7
0.5
0
-25.6
-11.9
-11.9
0
-25.6
0.5
-25.6
0.5
Page 61 B6
to FUNCTION (2)_CB402
W3002
Page 61
B5
to FUNCTION (2)_CB401
-25.5
LINE 2
0
7
-11.8
0
0
-11.8
0
8
12.6
0
IC301
0
0
0
IC301
0
0
-12.5
0
0
0
0
0
0
12.6
IC302
IC302
-12.5
12.6
IC303
0
IC301: NJM2068MD-TE2
W3004
0
0
Page 64
B5
Dual operational amplifier
OUT1
–IN1
+IN1
–VCC
1
2
+–+
3
4
8
7
–
6
5
+VCC
OUT2
-IN2
+IN2
to FRONT (1)_CB519
0
0
0
0
-11.8
9
0
-11.8
0
0
0
0
0
-11.8
-11.8
IC303
-12.6
0
CB305
Page 65 B5
IC302, 303: OP275GSR Dual bipolar/JFET, audio operational amplifier
1
OUT A
2
-IN A
3
+IN A -IN B
4
V-
8
7
6
5
V+
OUT B
+IN B
to FRONT (10)_W1003
10
FUNCTION (1)
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
60
Page 4
1
2
3
4
5
6
7
8
9
10
A
FUNCTION 2/3
Page 60
to FUNCTION (1)_W3002
to FUNCTION (1)_W3001
K6
Page 60
K4
BCDEFGH I JK
0
0
0
0
0
0
0
0
0
IC410
0
0
0
0
0
0
0
0
0
0
0
IC411
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
12.5
0
IC404
0
-12.4
0
0
0
IC404
0
12.5
0
IC405
0
0
-12.4
0
0
IC405
0
0
-12.4
0
0
-12.4
0
12.5
12.5
-12.3
12.5
0
0
12.5
0
0
0
-12.4
0
-11.9
-11.9
0
0
0
0
24.5
25.5
6.4
5.8
5.8
5.8
5.8
0
0.3
0.3
-11.8
-11.8
24.2
25.3
6.4
5.8
5.8
5.8
0
0.3
12.6
0
IC413
0.3
0
0
24.9
24.5
1.0
0.7
0
0
12.6
0.7
-24.6
-25.3
-25.7
25.0
24.4
1.0
0.7
-24.5
-25.0
-25.7
12.6
25.5
1.0
0.4
0.4
-0.1
-0.2
-0.7
-25.3
-25.8
25.5
1.0
0.4
0.5
-0.1
-0.2
-0.7
-25.7
-25.2
OUT L
CB406
Page 63
A8
to MAIN (2)_W202
-11.9
-11.9
CB403
Page 60
K3
to FUNCTION (1)_W3003
CB404
0
IC412
0
0
0
0
0
0
0
0
0
0
0
IC407
0
0
0
0
0
0
0
0
0
0
0
IC408IC409
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
0.1
0
0.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
12.5
0
IC406
0
-12.4
0
0
0
IC406
0
12.5
0
IC401
0.1
-12.5
0
0
0.1
IC401
0
12.6
12.6
0
0
IC402
-12.5
0
0
0
IC402
0
12.6
0
IC403
0
-12.5
0
0
0
IC403
0
0
-12.4
0
0
0
-12.4
0
0
0
-12.5
0
-11.9
12.6
-12.5
0
0
12.6
12.6
-12.4
0
-12.4
0
0
-12.4
0
-11.9
0
-12.5
0
0
0
0
0
0
IC413
0
0
-12.5
-12.5
-12.5
24.9
24.4
25.4
6.4
5.8
5.8
5.8
5.8
0
0.3
-11.8
25.4
24.3
-11.8
6.3
5.8
5.8
5.8
0
5.8
0.3
0.3
24.4
1.1
-0.4
0
0.3
-0.7
-24.7
-24.7
-25.8
24.9
24.4
1.0
0
-0.7
-24.7
-25.3
-25.8
25.4
1.1
0.4
0.5
-0.1
-0.7
-25.8
25.4
1.0
0.4
-0.4
-0.2
0
-0.7
-0.7
-25.8
-24.7
12.5
0.6
0
0
0.5
-12.5
-12.5
12.6
0.5
0
0
-0.5
-12.5
-12.5
25.5
0.5
25.5
0.5
0
0
0.5
-25.8
-25.8
Page 66
to FRONT (11)_W6
F4
W4004
Page 64
to FRONT (1)_CB517
K6
IC407-412: TC94A81UG
Electronic volume control
CB405
Page 63 A3
-11.9
-11.9
to MAIN (1)_W102
L-MVR-AGND1
L-MVR-IN
L-ZX-AGND
L-ZX-IN
L-SW-OUT
L-SW-IN4
L-SW-IN3
L-SW-IN2
L-SW-IN1
TEST
VDD
IN L
CB401
CB402
00000
12.5
12.5
0
0
0
0
0
0
0
0
0
0
0
0
12.5
000
00000
12.5
12.5
12.5
0
0
0
0
0
0.1
0
0
0
0
0
-12.5
000
00000
12.5
12.5
0
0
0
0
0
0
0.1
0
0
0
0
0
-12.5
000
00000
12.5
12.5
0
0
0
0
0
0
0.1
0
0
0
0
0
-12.5
000
00000
12.5
12.5
12.5
0
12.5
0
0
0
0.1
0
0
0
0
0
-12.5
000
00000
12.5
12.5
0
12.5
0
12.6
0
0
0.1
0
0
0
0
0
-12.5
000
L MN
A-S2000
IC401-406: OP275GSR
Dual bipolar/JFET, audio operational amplifier
1
OUT A
2
-IN A
3
+IN A -IN B
4
V-
IC413: NJM2068MD-TE2 Dual operational amplifier
OUT1
1
–IN1
2
+–+
3
+IN1
4
–VCC
L-MVR-AGND2
L-MVR-OUT
L-TVR-OUT
L-TVR-IN
33132 31 30 29 28
34
Latch
L-TVR-REF
Latch LatchLatch
35
36
Latch
37
Zero crossing
detection
38
circuit
Decoder
39
40
Latch
41
Test and
3
CS14CS2
Timing
gene
5
MUTEM
42
43
45
Power ON reset
2
SS1
SS2
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
V+
8
OUT B
7
6
5
+IN B
+VCC
8
OUT2
7
–
6
-IN2
5
+IN2
R-TVR-IN
R-TVR-REF
NC
27 26 25 24 23
Latch
Decoder
24-bit shift register
Level shift
6
GND
8
7
TC
MUTE
R-TVR-OUT
Zero crossing
Latch
9CK10
R-MVR-AGND2
R-MVR-OUT
Latch Latch
detection
circuit
11
STB
DATA
R-MVR-AGND1
22
R-MVR-IN
21
20
R-ZX-AGND
19
R-ZX-IN
18
R-SW-OUT
17
R-SW-IN4
16
R-SW-IN3
15
R-SW-IN2
14
R-SW-IN1
NC
13
VSS
12
FUNCTION (2)
61
Page 5
A-S2000
A
BCDEFGH I JK
L MN
1
FUNCTION 3/3
Page 66 B4
to FRONT (14)_W8A, W8B
(R, L models)
To POWER TRANSFORMER
2P
(U, C, T, K, A, B, G, J models)
W11A
CB2
600mm
W11B
2
5.0
5.0
5.0
0
0
3
0
0
4.9
5.1
0
0
0
0
0
0.9
0
16.6
16.6
16.6
16.6
8.3
16.6
8.4
16.6
0
10.1
8.9
9.5
8.9
4
0.1
0.1
0.8
W1
0
8.9
8.9
26.4
9.5
8.9
26.4
8.9
9.5
8.9
8.9
8.9
0
9.8
26.4
8.1
AC20.4
AC IN
8.4
0
8.4
W10A
W10B
POWER ON/OFF switch
5
Page 64
to FRONT (1)_CB501
B4
6
CB25
Page 63
to MAIN (3)_W317
7
To POWER TRANSFORMER
8
L3
CB23
AC29.8
-19.4
IC51
19.6
0
19.4
0
19.6
1.3
12.2
0
-11.9
-11.9
5.0
0
12.2
-11.9
12.2
W3
Page 59
I3
to BALANCE_CB203
12.0
-11.9
W4
Page 66
0
to FRONT (13)_CB79
H6
0
-19.6 -12.0
-12.0
0
0
12.0
9
10
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
62
IC52
FUNCTION (3)
IC51: NJM7812FA
Voltage regulator
INPUT
OUTPUT
COMMON
IC52: NJM7912FA Voltage regulator
R1
Q4
R2
D2D1
R3
Q5
Q6
Q2
Q1
R4
R5
R6
Q7
Q8
R7
R9R8
COMMON
Q3
Q10
Q12
Q14
Q15
Q19
R10
Q17
Q9
Q11
Q13
C1 C2
R22
Q16
Q23
R20
C3
Q18
Q24
R23
R24
Q25
Q20
R13
D3
R14
R17
R16R15R21R12R11
OUTPUT
Q21
Q22
R18
R19
INPUT
Page 6
A
BCDEFGH I JK
L MN
A-S2000
MAIN
1
F6
to MAIN (2)_CB75
CB55
IC102
5.1
MAIN (4)
60.8
2
60.8
58.258.2
58.2
58.2
58.2
2.9
3
2.9
-1.8
Page 61 J7
W102
Ground point
58.2
3.4
3.4
2.9
3.4
1.8
2.9
-2.0
-1.8
60.8
59.8
60.1
59.4
58.8
58.2
0.6
0.6
59.4
-50.9
60.2
-60.7
58.2
0.6
0.6
0
-50.9
50.9
-1.8
-51.2
-51.4
to FUNCTION (2)_CB405
4
5
MAIN (1)
CB52
M2
to MAIN (3)_W314
Idling adjustment
-1.8
-51.9
-51.9
-52.4
60.8
60.8
0
Page 66
H4
to FRONT (12)_W101A, W101B
CB59
CB64
60.8
-1.8
-1.8
1.8
#
-52.4
-1.8
-53.1
#
-52.4
-1.8
-53.1
#
-52.5
-53.1
-1.8
60.6
-53.0
-53.3
-0.7-1.0
-1.0
-0.7
-0.8
-53.3
-53.5
CB54
CB60
60.8
-1.7
-1.7
-1.7
-1.7
#
-52.5
-1.7
-53.1
#
-52.6
-1.7
-53.1
-0.9
60.6
-53.1
-53.5
#
-52.5
-53.1
-52.2
-51.6
-52.2
F1
to MAIN (1)_CB55
CB75
MAIN (5)
0.9
0
CB21
W103
39.8
22.0
50.8
50.3
1.1
60.7
12.7
-0.7
-0.7
1.3
1.3
50.3
6.6
6.1
-1.7
-50.9
-53.2
-51.6
0
6.6
0.5
6.1
0.6 0.6
57.4
6.6
6.1
6.1
0
0.5
0
-0.5
-1.0
1.1
0
0
0
0
-1.0
Head phone DC offset
CB57 CB58
IC202
0.9
0
0.5
-45.0
-45.5
-45.0
-57.3
5.1
-1.0
-45.0
-45.5
21.2
1.1
22.2
0.6
0
W104
0
-1.0
0
-22.1
-20.9
-22.1
-39.8
AC89.5
To POWER TRANSFORMERTo POWER TRANSFORMER
CB22
AC48.5
W303C
DC51.4
W303D
W303B
DC51.4
W303A
K8
10 W
5 k-ohms
10 W
5 k-ohms
AC38.5
-23.8
-23.8
33.8
-52.5
-53.9
-61.0
-32.2
61.1
32.2
To POWER TRANSFORMER
CB24
24.6
-10.8
-15.5
-10.8
23.8
-10.8
-15.5
-10.8
33.8
34.1
34.1
-52.8
-53.9
AC38.5
W317
0
4.4
IC300
-15.5
-16.5
0
0
-16.5
0
5.1
5.1
3.7
-16.5
3.2
3.7
5.1
-15.5
IC301
4.8
-16.5
AC38.5
4.6
IC302
-16.5
4.4
0.6
4.8
IC303
-16.5
4.6
5.1
5.1 0
CB26
0
-15.6
-16.5
0
0
-15.6
-16.5
0
33.6
5.1
33.75.1
-52.7
AC38.5
-24.4
24.6
-10.8
-15.6
-10.8
24.9
-10.8
-15.6
-10.8
33.7
-53.8
-24.5
33.6
-53.8
W314
to MAIN (1)_CB52
W315
to MAIN (2)_CB72
W318
to MAIN (2)_CB73
W316
Page 66 B3
to FRONT (11)_CB34
Page 62
to FUNCTION (3)_CB25
To POWER TRANSFORMER
10 W
5 k-ohms
DC51.4
W304C
W304D
10 W
5 k-ohms
DC51.4
W304B
W304A
-52.7
C5
C9
K8
C6
6
60.8
60.2
58.3
58.3
58.3
58.3
7
J3
W202
58.3
3.6
3.6
-1.6
-1.4
58.3
4.1
4.1
3.6
4.1
-1.4
3.6
-1.6
-1.4
Page 61
to FUNCTION (2)_CB406
Ground point
60.2
59.8
60.2
59.5
58.8
58.8
58.8
58.3
0.6
0.6
-59.5
-55.7
60.8
-60.7
-50.9
-56.7
58.3
0.6
0.6
0
-50.9
-1.5
-50.9
-51.6
-51.6
8
Idling adjustment
60.8
-1.5
-52.1
-52.1
-52.6
60.8
60.7 0
39.6
22.0
50.9
Page 66
H8
to FRONT (13)_W201A, W201B
60.8
12.6
-0.6
-0.6
-1.2
-1.2
50.4
6.6
6.1
0
57.4
6.6
6.6
6.0
0.5
6.0
6.1
0.5
0
0
Head phone DC offset
0.5
-45.0
-45.6
-1.5
CB79 CB80
-1.2
-1.5
-1.2
-1.5
-53.1
60.8
-1.5
-1.5
-1.5
-1.5
#
-52.5
-1.5
-53.1
-52.1
-51.6
-52.5
-50.9
-51.0
-51.6
#
-52.5
-1.5
-53.1
#
-52.5
60.6
-53.1
-53.1
-53.1
CB77 CB78
OUT L
-1.5
-1.5
-1.5
#
-52.5
-1.5
-53.1
#
-52.5
-1.5
-53.1
#
-52.5
-53.1
CB84
-1.2
-1.5
-53.1
60.6
-53.1
-53.1
50.4
1.1
1.1
0.5
0
-0.5
-1.0
-1.0
-45.0
-45.5
1.1
0.2
0
0
-0.1
-0.1
21.2
1.1
22.0
0.6
0
0
-0.5
-1.0
-21.8
-20.9
-21.8
-39.8
W203
CB71
W204
CB73
CB76
Page 64
to FRONT (1)_CB521
Page 64
MAIN (3)
C9
to FRONT (2)_CB504
M2
to MAIN (3)_W318
IC102, 202: LM61CIZ
Temperature sensor
9
10
MAIN (2)
CB72
M2
to MAIN (3)_W315
Note) Those parts marked with “#” are not included in the P.C.B. ass’y.
（マーク＃の部品は、基板に含まれません。）
Safety measures
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves.
• Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there.
Before starting any repair work, perform discharge by connecting a discharge resistor (5k-ohms/10W) between terminals at following positions. The time required for discharging is about 30 seconds.
1. C308 on MAIN (3) P.C.B..
2. C309 on MAIN (3) P.C.B..
3. C335 on MAIN (3) P.C.B..
4. C336 on MAIN (3) P.C.B..
CB74
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。 ・ 下記箇所には電源をOFFにした後も電荷が残り、高電圧が維持されており危険です。
修理作業前に放電用抵抗（5kΩ/10W）を下記箇所の端子間に接続して放電してください。放電所用時間は約30秒間です。
1. MAIN（3）P. C . B . のC308
2. MAIN（3）P. C . B . のC309
3. MAIN（3）P. C . B . のC335
4. MAIN（3）P. C . B . のC336
-45.0
-57.2
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
63
Page 7
A-S2000
A
BCDEFGH I JK
L MN
1
FRONT 1/3
POINT A-1 XL501 (Pin 23 of IC502) POINT A-2 A-3 1 / Pin 1, 2 / Pin 3 of CB501
1CB501 +5M
2
CB501 /RES
2
POWER ON POWER OFF
1
2
POWER ON
Writing port
CB515
CB507
0.1
4.6
0
W5006
3
FRONT (9)
W5004
1.9
0.1
CB509
POWER
indicator
CD
TUNER LINE 1 LINE 2 CD BAL
5.0
3.2
5.0
5.0
INPUT indicator
5.0
5.0
MAIN
DIRECT
5.0
5.0
AUDIO
MUTE
5.0
5.0
FRONT (4)
IC503
0
0.8
12.1
0
0
0.4
0
0.8
0.6
12.1
PHONO
5.0
5.0
5.0
5.0
5.0
5.0
FRONT (6)
FRONT (3)
IC501
0.2
4.3
2.1
2.5
2.6
0
0
0
4
A-21A-3
CB501
2
12.1
5.6
Page 62
to FUNCTION (3)_W1
C5
5.6
0
5.1
1.3
1.3
2.5
2.6
2.5
2.5
2.5
5.0
0
0.7
0.7
0.7
0.7
0
5.0
1.4
0
0
0
0.2
0
0
5.0
0
4.9
0.3
0.5
1.0
5.1
1.3
005.0
5.0
1.0
MICRO
PROCESSOR
5.1
0
4.9
IC502
0
2.1
0
0
2.4
5.0
5.0
5.0
00000
A-1
000
000
0
0
5.0
5.0
0
0
0
2.1
1.6
4.8
2.5
2.5
2.5
0.2
5.0
4.1
0
0
0
5.1
5.1
0.1
4.6
5.1
5.1
5.1
4.1
IC504
5.1
4.8
1.2
4.1
5.0
0
5.1
5.1
5.1
5.0
0
0
5.1
5.0
0
5.1
CB512
W5008
W5003A
W5005A
W5009A
5
000
0
TREBLE
5.8 5.1
IC505
5.8
8.7
0
5.8
5.8 5.0
5.1
4.3
4.4
5.1
3.6
5.0
6
+/-
0
0
BASS
+/-
BALANCE
W5007A
L/R
W5003B
W5005B
INPUT
SELECTOR
W5009B
W5007B
CB517
AUDIO MUTE
PHONO MM/MC
FRONT (8)
Page 61
to FUNCTION (2)_W4004
J6
VOLUME
FRONT (5)
FRONT (7)
IC501 TC74HC4051AFEL
8-channel analog multiplexer/demultiplexer
COM
C
IN
0
OUT
INH
A
B
C
Logic Level Converter
OUT
1
2
3
4
5
6
C
IN
7
IC503: LB1641 Motor driver
P1
3281097
OUT 1
VCC 2
OUT 2
P2
VCC 1
PRE DRIVER
4
41
62
COM 3
74
55
INH 6
VEE 7
GND 8
VZ
Vcc16
215
114
013
312
A11
B10
C9
12.0
11.9
0
7
0
5.0
FRONT (2)
0
5.0
5.1
CB503
SPEAKERS
OFF
A
8
B
A+B
TRIM
-6 0
+6
+12
CB524
W5002
-11.8
0
12.0
12.0
0
5.3
12.1
5.7
5.7
5.3
5.0
5.3
5.0
-11.8
0
0
0
11.9
0
0
12.0
11.9
12.0
11.9
0
-11.8
0
5.0
12.0
-11.9 -11.9
0
0
0
11.9
0
12.0
5.0
12.0
11.9
0
0
12.0
5
11.8
CB519
12.0
12.0
12.0
IC504: LC709004A-TLM-E
IN 1
GND
1
INPUT LOGIC
6
IN 2
I/O-expander for microcontroller
11.9
0
0
-11.9
0
11.9
-11.9 0
0
11.9
-11.9
0
CB521
Page 60
to FUNCTION (1)_W3004
Page 63
to MAIN (2)_W203
K8
K6
DIN
CLK#
CS#
RES#
2
Serial/parallel converter/shift register
3
4
Control logic
21
I/O control/output register
port 0 I/O buffer
24 17
P00
P07
port 1 I/O buffer
15 8
P10
P17
14
15
19
DOUT
VDD
VSS
IC505: RH5RE58AA-T1-FA Voltage regulator
IN
V
2
+
–
Vref
VOUT
3
1
GND
IC502: M38039xxxxx Single chip 8-bit microprocessor
Main
Main
clock
clock
Sub-clock input
Sub-clock output
XCIN
XCOUT
28
29
VSS
VCC CNVSS
32
1
Data bus
Reset input
RESET
input
output
XIN
XOUT
30 27 26
31
CB525
5.3
5.0
-11.8
9
10
JK501
JK501
PHONES
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
64
-11.8
-11.8
CB504
K8
Page 63
to MAIN (2)_W204
5.3
5.0
-11.8
Clock generating circuit
RAM
ROM
FRONT (1)
converter
VREF
A/D
(10)
AV
5 6 7 8 9
432
SS
I/O port P6
P6 (8)
10 11
PWM
(8)
SI/O2
(8)
INT3
P5 (8)
13 14 1516 17
18 19 57 58 59 60 61 62 63 64
12
I/O port P5 I/O port P3
SI/O1
(8)
20
MICROPROCESSOR
P4 (8)
21 22 2324 25
28 29
I/O port P4
converter
INT00 INT1 INT2 INT40
D/A
2 (8)
Timer Z (16)
47 48
Timer 1 (8)
Timer 2 (8)
Timer X (8)
Timer Y (8)
INT01 INT41
50 51 5253 54
49
I/O port P0
P0 (8)
55 56
A
X
Y
S
PC
LPCH
PS
D/A
converter
1 (8)
SI/O3
(8)
P3 (8)
CNTR0
CNTR1
CNTR2
P2 (8)
34 35 3637 38
33
I/O port P2 (LED drive)
Prescaler 12 (8)
Prescaler X (8)
Prescaler Y (8)
P1 (8)
39 40
42 43 4445 46
41
I/O port P1
Page 8
A
BCDEFGH I JK
L MN
A-S2000
FRONT 2/3
1
W1001
20.9 25.7
Page 66
G3
to FRONT (11)_CB27
2
0.6
10.6
0
0.6
10.6
0
0.6
10.6
0
0.6
10.6
0
3
0
-0.5
-0.5
-10.5
-0.5
0
-0.5
-10.5
0
-0.5
0
-0.5
-10.5
25.1
24.2
24.6
5.4
5.4
0
0.1
6.0
-0.1
24.6
25.1
5.5
0.1
0.1
24.2
24.7
0.8
24.6
25.2
0.8
-0.7
-24.7
24.2
0.8
0.7
25.7
0.2
-0.1
-25.2
20.9 25.7
0.6 0.6
00
0
-0.5
-20.7
-20.7
0.6
0
0.5
0.5
-25.2
4
-24.7
-25.2
W1002
PHONO
Page 60
to FUNCTION (1)_CB301
B3
5
25.2
-24.6
-24.7
-24.2
-10.5
6
-0.6
-0.6
0
-10.5
0
-0.6
-10.5
0
-10.5
-0.6 0
-0.7
-0.7
-25.3
-0.1
0.1
0.1
0
6.0
5.4
0
0.6
7
10.6
0.6
0
10.6
0.6
0
10.6
0.6
0
10.6
24.2
24.2
25.1
6.0
24.4
24.4
6.0
24.6
25.1
0.1
5.5
0
24.6
24.2
0.7
24.7
24.7
-11.8 11.9
0.2
0.7
25.7
0.7
-11.8 -11.8
25.2
-11.8 11.9
W1003
Page 60
K9
to FUNCTION (1)_CB305
8
9
10
FRONT (10)
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
65
Page 9
A-S2000
A
BCDEFGH I JK
L MN
1
2
3
FRONT 3/3
Page 63
to MAIN (3)_W316
M2
CB34
31.9
29.5
31.9
29.2
29.2
11.7
12.3
12.3
0
29.5
29.7
21.1
29.7
29.2
25.9
29.7
29.2
27.8
29.7
29.2
27.4
29.7
29.2
17.5
29.7
21.1
CB27
W6
Page 65
to FRONT (10)_W1001
M2
Page 59
to BALANCE_W2001
I2
CB59
10.7
-11.9
FRONT (12)
-11.9
-11.9
Page 61
to FUNCTION (2)_CB404
4
J5
Page 63
to MAIN (1)_CB64
E3
W101B
A+-
SPEAKERS
R CH
B+-
-11.7
-29.7
-12.2
-12.2
W101A
0
-29.6
-20.9
-29.6
-25.4
-29.2
-27.6
-29.2
-27.7
-29.2
-17.3
-29.2
-20.8
5
-29.6
-29.2
-29.7
-29.7
-29.7
-29.7
-29.7
-29.7
FRONT (11)
-31.9
-31.9
FRONT (13)
6
CB79
Page 62
to FUNCTION (3)_W4
7
FRONT (14)
R, L models
W12A
8
W12B
W12C
W12D
VOLTAGE SELECTOR
230-240V
220V 110V 120V
1-2, 5-6 2-3, 6-7 3-4, 7-8 4-5, 8-1
Page 63
to MAIN (2)_CB84
E7
H8
W201B
W201A
OUT L
10.7
-11.9
-11.9
-11.9
A+-
SPEAKERS
L CH
B+-
9
10
To POWER TRANSFORMER 8P
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter. ★ Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
66
620mm
W8A
W8B
Page 62
to FUNCTION (3)_CB2
G2
W12E
W12F
W12G
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