Yamaha MCR-Nx70, Service Manual

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IC309
CB305
IC802
CB303
CB302
CB306
W301
W802
IC609
IC302
IC610
IC615
IC304
IC608
IC301
IC602
IC603
IC606
IC604
IC601
IC607
CB601
IC803
IC611
CB304
IC312
IC305
IC303
IC310
JK301
MAIN (1)
(Side A)
A-U670/A-U671
A-U670/A-U671
A-U670
A-U671
A-U670/A-670
A-U670/A-670
A-U670/A-670
A-U670/A-670
A-U670/A-670
A-U670/A-670
A-U671
A-U671
A-U671
VOLUME
(CB801) A-U671
MAIN (2)
(CB2)
MAIN (6)
(W7)
MAIN (2)
(CB1) A-U670/A-U671
Writing port
(For factory)
SPEAKERS
L R
L R
SUBWOOFER SYSTEM
LINE IN
ANALOG IN
A-U670/A-670
A-U671
Power supply module
Power supply module
USB
USB DAC
A-U670
A-U671
R
L
GND
HP_DET
+10V
-10V
GND
GND
+27V
AMP_GND AMP_GND
-27V
AMP_GND
DGND
VOL-AD
VRG
VOLUME-DN
+5M
+5M
VOLUME-UP
+3.3S
PURE_SW PCMx1_LED PCMx4_LED DSDx1_LED LED_AUX LED_PURE
INPUT_SW
DSDx2_LED
PCMx2_LED PCMx8_LED
LED_USB
+5V
+3.3S
BLN_AD BS_AD
TRB_AD
DGND
+3.3M
PWR_ON
LED_PWR
VOL_B/VOL_AD
VOL_A/REMOTE
DGND
No replacement part available.
サービス部品供給なし
No replacement part available.
サービス部品供給なし
No replacement part available.
サービス部品供給なし
No replacement part available.
サービス部品供給なし
1 4
8 5
1
13
18
12
30
25
24 19
1 4
8 5
1 4
8 5
4
3
5 1
4 5
3 1
25
48
37
36
24
13
12 1
5
9
6
10
4
1
5 4
8 1
1
3
4
5
15
22
28
21
14
8
7 1
1 4
8 5
1 4
8 5
1 4
8 5
1
1
2
4
3
4
8 5
17 16
32 1
1
4
8 5
5 k-ohms
10 W
5 k-ohms
10 W
A B C D E F G H I J
1
2
3
4
5
6
7
36
A-U670/A-670/A-U671/NS-BP401/NS-BP301
• Semiconductor Location
■
PRINTED CIRCUIT BOARDS
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.
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。
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 the capacitors 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, connect a discharging resistor (5 k-ohms/10 W) to the terminals
of each capacitor indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
C307, C308 on MAIN (1) P.C.B.
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。
・ 下記のコンデンサには電源を 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 k Ω /10 W）を下記の各コンデンサの端子間に接続して放電してください。放電所用時間は各々約 30 秒間です。
MAIN（1）P.C.B. の C307、C308
Ref no. Location
D303 F3
D304 F3
D307 G5
D308 G5
D313 H5
D315 C4
D316 C4
D317 C4
D318 C4
D319 C5
D328 F3
D329 F3
D331 G5
D601 G3
D602 G3
D603 G3
D606 G4
D607 G4
D805 D6
D806 D4
D807 D4
IC301 G4
IC302 G5
IC303 F3
IC304 G5
IC305 E4
IC309 C4
IC310 F3
IC312 E5
IC601 G3
IC602 G3
IC603 H3
IC604 H3
Ref no. Location
IC606 H3
IC607 H3
IC608 G4
IC609 G5
IC610 G5
IC611 G4
IC615 F4
IC802 D6
IC803 H4
Q303 E6
Q304 G5
Q306 E5
Q309 G6
Q310 G6
Q312 G6
Q313 H5
Q314 D6
Q315 D5
Q318 D5
Q320 D6
Q321 E5
Q323 B5
Q326 E4
Q327 E5
Q328 E6
Q329 H4
Q330 E3
Q331 E3
Q332 H5
Q601 F6
Q603 G6
Q605 G6
Q607 H3