Yamaha AP-U70 Manual de servicio - Página 33

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Yamaha AP-U70 Manual de servicio
A
B
C
I
SCHEMATIC DIAGRAM (DSP)
1
Point q (Pin 1 of IC417)
V : 2V/div, H : 50 nsec/div
DC, 1 : 1 probe
3.2
0
0
0V
0
0
0
0
USB
0
0
0
0
Point w (Pin 4 of IC430)
V : 1V/div, H : 50 nsec/div
DC, 1 : 1 probe
2
0V
4.8
3.3
4.8
3.3
3.3
0
Point e (Pin 74 of IC436)
0
V : 2V/div, H : 0.1 µsec/div
DC, 1 : 1 probe
0V
3
3.1
2.6
3.1
Point r (Pin 47 of IC475)
V : 2V/div, H : 50 nsec/div
DC, 1 : 1 probe
0
4.2
4.2
0
0
0
PC IN
4.9
0
0V
4.2
4.2
0
AUX 1
0
IN
4
4.9
2.5
Point t-A (CH1 : Emitter of Q416)
4.9
PC OUT
Point t-B (CH2 : Collector of Q419)
0
V : 5V/div (CH1), V : 2V/div (CH2)
2.5
DC, 1 : 1 probe, H : 5 sec/div
2.4
2.4
0
0
4.9
CH1
2.4
0
2.3
4.9
0
4.9
0
CH2
AC CORD ON
AC CORD OFF
5
IC406 : PQ025EZ5MZP
+2.5V Regulator
1
3
DC INPUT (VIN)
DC OUTPUT (VO)
2.5
I C
2
ON/OFF CONTROL (VC)
2.5 0
5
GND
4.8
3.3
IC445, 454, 458, 470, 471,
473 : µPC4570G2
6
IC416 : NJM2904M-T1
4.8
3.3
Dual OP Amp
0
0
OUT
1
1
8
+V
CC
–IN
1
2
7
OUT
2
+
–
+
–
4.8
+IN
1
3
6
–IN
2
–V
4
5
+IN
0
4.8
CC
2
0
0
4.8
IC401 : TC74HC00AF
0
4.8
0
Quad 2 Input NAND
2.4
7
A1
1
14
V
DD
2.1
0
B1
2
13
B4
Y1
3
12
A4
A2
4
11
Y4
B2
5
10
B3
3.0
0
Y2
6
9
A3
0
0
V
7
8
Y3
4.8
0
0
SS
0
4.8
0
0
3.3
IC418 : TC74HCUO4AF-TP1
0
IC479 : TC74HCTO4AF-T1
0
Hex Inverters
3.3
0
8
4.9
1A
1
14
V
DD
0
0
1Y
2
13
6A
0
4.8
2A
3
12
6Y
0
2.2
2Y
4
11
5A
0
q
2.0
3A
5
10
5Y
0
0
3Y
6
9
4A
2.4
V
SS
7
8
4Y
µ
IC478 :
PC4574G2
4Channel OP-Amp
9
OUT A
1
14
OUT D
A
D
–IN D
–IN A
2
– +
+ –
13
+IN A
+IN D
3
12
V+
4
11
V–
+INB
5
10
+INC
–INB
6
9
–INC
– +
+ –
B
C
OUT B
7
8
OUT C
2SA1037K (Q, R, S)
2SK1725-AZ
1SS355
L88M33T
PQ025EZ5MZP
NJM2904M
10
µPC4570G2
2SC2412K (Q, R, S)
1SR154-400
2SC3326 (A, B)
UDZ4.7B
DTA144EKA
UDZS6.8B
C
1: VIN
2: VC
8
1
2
3
1: VIN
1
5
3: VO
D
2: GND
E
G
4: NC
3: VOUT
S
5: GND
B
D
E
F
USB CONTROLLER
1.1
4.8
3.1
w
1.1
4.8
0.9
0
3.3
0
2.4
0
3.2
2.4
0
3.2
2.3
0
1.1
2.4
2.4
4.8
2.4
2.4
2.7
0
2.3
2.8
0
0
0
2.8
0.4
0
0
0
0
0
0
0
0
0
4.9
0
0
4.9
0.4
0
0
4.9
4.9
4.9
4.9
4.9
0
0
0
2.9
0
4.9
0
0
0
0
0
0
3.3
2.4
4.9
0
0
0
4.9
3.9
0
3.9
0
0
4M
DRAM
2.3
2.2
1.8
2.4
0
0
3.3
0
0
3.3
2.0
2.2
0
2.1
0
AC3D3
0
1.6
3.2
2.3
1.6
1.6
1.6
0
2.4
0
0
0
TC74HC00AF
CS5360-KSR
AD1854JRSRL
LC75342M-TLM
TC74HCT04AF-T1
TC74HCU04AF-TP1
15
16
µPC4574G2
11
5
8
14
15
28
20
10
30
14
7
4
1
1
1
1
1
G
H
3.2
0
1.3
0.7
0.7
0
2.4
0
0
3.2
2.4
2.4
0
0
0
0
0
0
4.9
4.8
GATE ARRAY
0
4.8
0
0
0
3.0
0
3.3
0
0
r
0
2.1
2.3
0
5.1
1.1
5.1
0
0.1
2.0
4.9
2.3
4.8
e
1.4
0
0
5.0
0
2.4
4.8
4.4
0
0
1.0
2.4
0.1
4.9
4.8
0
4.6
4.9
4.8
0
4.8
4.8
0.8
CPU
0
4.8
0
0
4.8
4.8
1.1
4.8
4.8
4.8
4.8
4.8
1.1
4.8
0
0
4.8
0
4.8
5.0
4.8
4.8
0.2
CIRCUIT CHANGES BY MARKET.
X : NOT USED
M5M51008CFP-70H
MSM514260C-60JS
MBM29F400BC-55
USS-820DT-DB
HD6417014F28
84
25
85
17
36
25
21
37
24
24
16
20
32
40
48
48
13
1
1
112
1
12
1
1
I
J
K
4M ROM
SRAM
t A
14.7
4.8
4.3
4.3
0
MAIN
0
0
0.3
4.3
DAC
0
4.8
0
2.3
0
4.9
2.4
4.9
2.4
0
4.8
0
0.3
0
4.8
0
0.3
4.8
0
4.3
2.4
0
4.8
0
2.3
0
0
4.8
4.3
4.3
0
-14.7
2.3
2.3
4.8
2.4
2.4
2.4
0
4.9
4.8
USB
-14.0
4.8
4.3
4.3
DAC
0
4.3
MIX MUTE
0
14.7
0
4.8
2.3
0
0
4.9
2.1
0
0
4.9
2.4
0
4.8
0
0
0
0
4.8
4.8
0.6
0
2.4
0
0
3.2
0
4.8
2.3
2.3
2.4
2.4
0
2.4
0
0.6
0
0
0
0
-14.7
0
0
4.3
4.8
4.3
4.3
0
0
0
-14.7
0
0
0
4.9
14.7
2.2
2.2
2.2
2.2
0
0
0
0
0
4.9
4.9
4.8
2.2
0
2.2
2.2
14.7
2.2
0
0
2.2
0
4.9
2.2
0
0
2.3
2.2
2.4
2.2
3.9
2.4
0
4.9
2.2
0
0
0
-14.7
4.9
0
2.2
2.2
2.2
2.2
A/D CONVERTER
-14.7
4.9
YSS928
LC27287B-TF3
57
120
81
132
89
56
121
80
133
88
160
41
176
45
29
28
1
40
1
44
L
M
N
AP-U70
5.1
5.7
4.9
5.7
4.9
TO OPE (1)
5.7
P-E39/J37
C-8
RESET
10.4
0.4
4.9
10.4
0
9.8
0
6.8
0
0
0
0
2.4
TO MAIN
P-E39/J37
tB
C-3
0
0
TO MAIN
P-E39/J37
C-5
SF MUTE
0
0.6
0
0
0.6
0
A MUTE
14.6
L
0
0
0
0
-14.0
0
REC OUT
0
-14.0
0
R
0
0
0
L
-14.7
AUX 2 IN
14.7
A MUTE
0
0
0
R
0
0
-14.0
0
0
-14.0
0
0
-14.0
-14.0
0
0
0
0
0
-14.7
L
AUX 1 IN
R
L
PC IN
INPUT SELECTOR &
R
VOLUME
* All voltage are measured with a 10MΩ/V DC electric volt meter.
* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
E-38/J-36