Yamaha MFC2 Service Manual Page 64
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CB501
IC505
IC501
CB515
IC502
JK501
JK501
CB503
CB524
CB525
CB504
W5002
IC504
CB517
CB519
CB521
CB507
CB509
W5004
W5006
W5003A
W5005A
W5005B
W5009A
W5009B
W5007A
W5007B
W5003B
CB512
W5008
IC503
A
1
2
3
4
5
6
7
8
9
10
BCDEFGH I JK
L MN
A-S2000
64
★ 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.
FRONT 1/3
0
0.7
5.1
0.2
4.3
2.1
0
0
0
12.1
5.6
5.8 5.1
5.1
4.4
4.3
3.6
5.1
8.7
5.8
5.8 5.0
5.8
0
0
5.6
2.5
2.6
1.3
1.3
2.5
2.6
2.5
2.5
2.5
5.0
-11.8
-11.8
5.0
5.1
0
5.0
-11.8
0
0
0
0
0
11.9
0
0
12.0
12.0
0
0
11.9
0
0
0
11.9
0
0
0
11.9
11.9
11.9
12.0
12.0
12.0
12.0
-11.9 -11.9
-11.9
0
0
11.9
12.0
-11.9
0
0
11.9
12.0
-11.9
12.0
-11.8
12.0
0
0
5.0
0
0
5.0
12.0
0
11.9
0
11.8
12.0
5.0
5.3
5.3
5.3
-11.8
12.1
5.7
5.7
5.0
5.0
5.3
-11.8
5.0
5.3
-11.8
5.0
0.1
4.6
5.1
5.1
5.1
5.1
5.1
0
0
5.1
4.1
5.1
5.1
4.1
4.8
1.2
5.1
5.1
5.0
0
5.1
5.0
0
5.0
4.6
1.9
0.1
5.0
3.2
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
0
0.8
0.4
0
0
12.1
12.1
0.8
0.6
0
0.1
0
0
0
0
0
0.7
0.7
0.7
0
5.0
1.4
0
0
0
0.2
0
0
5.0
0
4.9
5.1
1.0
5.1
1.3
0
0
5.0
5.0
5.0
0
0
0
0
0
0
0
0
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
0.5
0.3
4.9
0
0
2.1
2.4
0
5.0
5.0
0
0
0
0
5.0
5.0
0
1.0
A-2
1
A-3
2
A-1
MICRO
PROCESSOR
FRONT (1)
FRONT (8)
FRONT (7)
FRONT (5)
FRONT (4)
FRONT (6)
FRONT (3)
FRONT (9)
FRONT (2)
41
62
COM 3
74
55
INH 6
VEE 7
GND 8
Vcc16
215
114
013
312
A11
B10
C9
IC501 TC74HC4051AFEL
8-channel analog multiplexer/demultiplexer
Logic Level Converter
OUT
C
IN
OUT
C
IN
A
B
C
INH
COM
0
1
2
3
4
5
6
7
IC503: LB1641
Motor driver
INPUT LOGIC
IN 1
IN 2
VZ
P1
P2
OUT 1
OUT 2
VCC 2
VCC 1
GND
PRE DRIVER
1
3281097
4
6
5
IC504: LC709004A-TLM-E
I/O-expander for microcontroller
Control logic
port 0 I/O buffer
Serial/parallel converter/shift register
I/O control/output register
DIN
VDD
DOUT
VSS
CLK#
CS#
RES#
P00
P07
2
14
15
19
3
4
21
24 17
port 1 I/O buffer
P10
P17
15 8
2
1
3
VOUT
GND
V
IN
–
+
IC505: RH5RE58AA-T1-FA
Voltage regulator
Vref
POINT A-1 XL501 (Pin 23 of IC502) POINT A-2 A-3 1 / Pin 1, 2 / Pin 3 of CB501
1CB501 +5M
POWER ON POWER OFF
CB501 /RES
2
1
2
POWER ON
IC502: M38039xxxxx
Single chip 8-bit microprocessor
P6 (8)
A/D
converter
(10)
PWM
(8)
I/O port P6
5 6 7 8 9
10 11
432
P0 (8)
I/O port P0
50 51 52 53 54
55 56
49
P2 (8)
I/O port P2
(LED drive)
34 35 36 37 38
39 40
33
P5 (8)
INT3
VREF
XIN
Main
clock
input
Main
clock
output
Sub-clock
input
Sub-clock
output
AV
SS
INT00
INT01
INT41
INT1
INT2
INT40
P3 (8)
I/O port P5 I/O port P3
13 14 15 16 17
18 19 57 58 59 60 61 62 63 64
12
P4 (8)
I/O port P4
21 22 23 24 25
28 29
20
SI/O2
(8)
ROM
A
MICROPROCESSOR
RAM
Clock generating circuit
SI/O1
(8)
D/A
converter
2 (8)
D/A
converter
1 (8)
SI/O3
(8)
P1 (8)
I/O port P1
42 43 44 45 46
47 48
41
X
Y
S
PC
LPCH
PS
Timer Y (8)
Prescaler Y (8)
Timer Z (16)
Prescaler X (8)
Prescaler 12 (8)
Timer X (8)
Timer 2 (8)
Timer 1 (8)
30 27 26
XCIN
28
XOUT
31
XCOUT
29
VSS
Data bus
32
VCC CNVSS
CNTR0
CNTR1
CNTR2
RESET
Reset input
1
to FUNCTION (1)_W3004
Page 60
K8
to MAIN (2)_W203
Page 63
K6
to MAIN (2)_W204
Page 63
SPEAKERS
PHONES
OFF
A
B
A+B
TRIM
-6
0
+6
+12
K8
to FUNCTION (2)_W4004
Writing port
Page 61
J6
to FUNCTION (3)_W1
Page 62
C5
POWER
indicator
INPUT indicator
CD
TREBLE
+/-
BASS
+/-
BALANCE
L/R
TUNER LINE 1 LINE 2 CD BAL
VOLUME
INPUT
SELECTOR
PHONO MM/MC
AUDIO MUTE
PHONO
MAIN
DIRECT
AUDIO
MUTE
- STEREO AMPLIFIER 1
- ■ FRONT PANEL 2
- ■ TO SERVICE PERSONNEL 2
- ■ REAR PANELS 3
- A-S2000 (B model) 4
- A-S2000 (K model) 4
- A-S2000 (A model) 4
- A-S2000 (G model) 5
- A-S2000 (L model) 5
- A-S2000 (J model) 5
- ■ REMOTE CONTROL PANELS 6
- ■ SPECIFICATIONS / 参考仕様 7
- ■ INTERNAL VIEW 8
- 0.5–0.75mm 10
- 4. フロントフレームASSYの外し方 11
- P.C.B.をチェックをする場合には： 12
- When checking the P.C.B.: 12
- 5. アンプユニットL/Rの外し方 13
- 5. Removal of Amplifier Unit 13
- 6. パワーユニットの外し方 13
- 6. Removal of Power Unit 13
- Bottom view 14
- 7. FUNCTION（2）P.C.B.の外し方 16
- ■ AMP ADJUSTMENT / アンプ部調整 19
- ● ヘッドフォンDCオフセット調整 20
- ● 操作手順● Operation Procedures 22
- "AUDIO MUTE" switch 26
- 例） ファームウェアバージョンが［V0035］の場合 26
- ● ファクトリーリセット 27
- ● Factory Reset 27
- ● プロテクション情報の表示 28
- POWER indicator 29
- "BALANCE" knob 29
- ● バージョン情報 30
- ● Version Information 30
- ■ IC DATA 31
- ■ PIN CONNECTION DIAGRAMS 35
- • Transistors 36
- ■ BLOCK DIAGRAM 37
- ■ PRINTED CIRCUIT BOARDS 38
- (Side B) 39
- BALANCE P.C.B 39
- FUNCTION (1) P.C.B 40
- FUNCTION (2) P.C.B 42
- FUNCTION (3) P.C.B 44
- MAIN (1) P.C.B 46
- MAIN (4) P.C.B 46
- (Side A) 48
- MAIN (2) P.C.B 48
- MAIN (5) P.C.B 48
- MAIN (3) P.C.B 50
- FRONT (1) P.C.B 52
- FRONT (2) P.C.B 52
- FRONT (3) P.C.B 52
- FRONT (9) P.C.B 52
- Ref no. Location 54
- FRONT (10) P.C.B 56
- SCHEMATIC DIAGRAMS 59
- FUNCTION 1/3 60
- FUNCTION 2/3 61
- FUNCTION 3/3 62
- Head phone DC offset 63
- PROCESSOR 64
- FRONT 2/3 65
- FRONT 3/3 66
- ■ REPLACEMENT PARTS LIST 67
- P.C.B. BALANCE 68
- P.C.B. FUNCTION 69
- ✻ New Parts ＊ 新規部品 73
- P.C.B. MAIN 74
- P.C.B. FRONT 78
- Carbon Resistors 83
- • OVERALL ASS’Y 84
- ✻ New Parts＊ 新規部品 85
- • AMP L UNIT 86
- • AMP R UNIT 86
- • REAR UNIT 87
- ■ REMOTE CONTROL 88
- • KEY CODE 89
- • KEY LAYOUT 89
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