Yamaha YAS-408 Service Manual page 32

A B
YAS-408/YMS-4080/ATS-4080
1
MAIN 5/6
YAS-CU408/YMS-4080/ATS-CU4080 AMPLIFIER SECTION
2
[6/6]
PVDD_23V
[6/6]
GVDD
[6/6] DDFA_3V3
[1/6] AMP_OTW
[1/6] AMP_SD
[1/6] AMP_RST
R518 0R
[1/6,2/6] SCL
R517 0R
[1/6,2/6] SDA
R500 10R
[2/6] AMP_DIN
R501 10R
[2/6]
AMP_WS
R502 10R
3 [2/6]
AMP_BCK
CN501
FFC_1.0mm_V(NC)
MISO
1
MOSI
2
CLK
3
CS#
4
GND3
5
IC500
58 NC
4
59 DC_CAL_CTRL
60 PIO[9]/PWM
61 PIO[10]/PWM/TWI
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
5
6
7
32
C D
CSRA6620
C503
0.1uF25V
R506
20K1%
VDD_PADS_1 38
37
PIO[7]
PIO[8] 36 R507
4.02K1%
VSS_DAC 35
PIO[11]/PWM/TWI DAC_REF_DCPL 34
C504
33
PIO[12]/PWM SUBS_AUD
1nF
32
PIO[13]/PWM VNEG_SENSE
31
PIO[14]/PWM VPOS_SENSE
30
PIO[15]/PWM CH2_FBA
77
29
PIO[16]/PWM VSS_PADDLE CH2_FBB
PIO[17]/CLAMP-OUTPUT CH2_FB_GND 28
PIO[18]/PROTECT-INPUT CH1_FB_GND 27
NC CH1_FBB 26
NC CH1_FBA 25
NC BGAP AUD_BG_DCPL 24
NC VSS_AUD 23
LDO
NC VSS_XTAL 22
NC MCLK_N 21
NC MCLK_P 20
Y500
104MHz
1 3
4 2
L500
MP05322
1uH
0603
C507
1nF
E F
YAS-CU4080/YMS-4080/ATS-CU4080
R519
10R
R520
10R
C522 Fsw=400KHz
IC501
0.1uF50V
TAS5342LADDVR
1 GVDD_B GVDD_A
2 OTW BST_A
3 NC NC
4 NC PVDD_A
5 SD PVDD_A
6 PWM_A OUT_A
7 RESET_AB GND_A
8 PWM_B GND_B
9 OC_ADJ OUT_B
R521
22K 10 GND PVDD_B
11 AGND BST_B
34K0.1% 12 VREG BST_C
R508
C523
13 M3 PVDD_C
R509 34K0.1% 0.1uF25V
14 M2 OUT_C
M1 GND_C
15
PWM_C GND_D
R510 34K0.1% 16
RESET_CD OUT_D
R511 34K0.1% 17
PWM_D PVDD_D
18
PVDD_D
19 NC
R522 NC
20 NC
0R
BST_D
21 VDD
22 GVDD_C GVDD_D
C524
0.1uF50V
C525 C553
R523
10R 0.1uF50V 0.1uF50V
R524
10R
★ 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.
G H I
TP30
C526
0.1uF
TP31
L502
44 OPTION:
10uH10A R+
C531 33nF25V FOR AD MODE BD MODE
43
42
R528
R525 0R R526
41 1.5K(NC) 3R3
C533 C534 C558
40
NC C535 C536
NC 1uF63V
R566 2R2 C566 1.5nF
10nF50V 1nF
39
R567 2R2 C567 1.5nF
R527
38
1.5K(NC) C538 C537
C539 C559 10nF50V 1nF
37
1uF63V
NC
36 R529
0R 3R3
R530 L503
35
10uH10A
R-
C541 33nF25V
34
C542 33nF25V
33
L504
0R
R531 10uH10A L+
32
R533
31 R532 3R3
1.5K(NC)
C544 C560
30
NC 1uF63V C545 C546
2R2 1.5nF
R568 C568 10nF50V 1nF
29
2R2 1.5nF
R569 C569
28
C547
C548
C551 C549 C561 10nF50V 1nF
27
NC NC 1uF63V
0R
R535
26 R536 R534
1.5K(NC)
3R3
25
C552 33nF25V L-
24
L505
10uH10A
23
Note:
Precaution for handling measuring instrument
Since the speaker output of this unit is BTL connected, the ground side
of the measuring instrument to be connected to the speaker terminal
MUST be kept in floating condition. MUST be kept in floating condition.
注意：
計測機器取り扱い上の注意
本機のスピーカー出力はBTL接続となっていますので、スピーカー端子
に接続する計測器のアース側はフローティング状態に保つ必要がありま
す。
● ⚠印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、
パーツリストに記載されている部品を使用してください。
● 本回路図は標準回路図です。改良のため予告なく変更することがあります。
J
4ohm
+
R
TWEETER
-
8ohm
+
R
-
+
CN500
R
VH-4P
+ -
4
RCH
-
3 FULL-RANGE
8ohm
+
2
(FRONT L/R)
LCH
-
1
+
DRIVERS
L
-
+
L
-
4ohm
+
L TWEETER
-