Yamaha DSP-E800, Service Manual

Page: 41 / 58

A B C D E F G H
1
2
3
4
5
6
I J K
7
8
DSP-E800
* All voltages are measured with a 10M
Ω
/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.
■
SCHEMATIC DIAGRAM
L.P.F
A/D,D/A
CONVERTER
(CODEC.
ADC/DAC)
DSP AMP
D/A CONVERTER
(DAC)
MUTE
DRIVE
STATIC RAM(1M SRAM)
+3.3V
REGULATOR
DSP + AC-3/PRO-LOGIC/DTS
DECODER
(AC3D2av)
MUTING
MUTING
DIGITAL
FORMAT
INTERFACE
RECEIVER
(DIR5)
FRONT L
REAR L
DIGITAL
IN
MAIN L
(DSP)
MAIN
L
CENTER
LFE
3
4
4.7
2.4 2.4 2.4 0 0 3.2
0
0 0
4.6
0
4.7
0 0 0 0 0
2.4
2.4
2.4
2.4
4.8
4.8 4.8 4.8
2.4
4.8
4.8 4.8 4.8
2.4
2.4
2.4
4.8 4.8 0 2.3 0 4.8 2.4
4.
8
0
2.4
2.3 0 0
4.8
0
0
0
0
0.1
0
0
0
4.8
4.8
4.8
0. 1
4.8
0
0
0
0 0
0
0
2.2
0
4.8
0
0
0 4.8 4.6 0 0 4.7
2.4
0
4.8 2.4 2.3 2.4
0
4.8 0 0
3.
1
4.
8
3 .2
2 .4
0
0
0
2 .4
0 .7
4 .6
0 .2
0
3 .2
0
0
0
3 .2
4 .7
0
4 .7
4 .7
0
0
2.4
2.4
0
3.2
0
0
0
2.4
2.4
11.9
0
0
0
0
0
11.9
0
–11.5
0
0
0 0
0
11.9
0
0
0
0
0
0
0
0
11.9
–11.5
0
0
0
0
–10.9
–10.9
0
0
0
0
0
0
11.9
–11.5
0
0
0
0
–10.9
–10.9
0
0
–10.9
0
0
–10.9
0
–11.5
0
0
0
0
0
0
0 0
0
0
0
–11.0
–11.0
–11.0
–10.9
–11.5
0
2.4
2.4
2.4
2.4
2.4
2.4
2.4
4.7
–11.0
–11.0
4.8
0.2
0
0.5
0.5 0.5
0
0
0
4.8
4.8
0.5
0
0.5
0.2
0.5
0.5 4.8
0.5 0
4.8
0
0
0
0.2
–11.0
0
2.4
2.4
2.3
0
4.8
0
2.3
4.7
2.4
2.4
0
0
4.8
0
2.3
0
4.8
0
2.4
2.4
0
2.4
2.3
0
0
4.7
4.7
0
0
0
3 .2
0
1 .1 3 .2
0
2 .4
0 0 0
4 .7
0
0
2.4 2.4 2.4
4.6
4.7
2.4
4.7
3.3
0
4.8
0.2
0
0 0.7 2.4
4.7
0 4.8 4.8 0.1 0.3 4.8 2.4 4.9 2.4 0 ~ ~ ~ ~ ~ ~ ~
~
~
~
~
~
~
~
~
~
~
~ ~ ~ ~ ~ ~ ~
~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~ ~
2.4
~ ~ ~ ~
IC1 : NJM2904M
IC8~13 : uPC4570G2
Dual OP-Amp
IC2 : HD74HC02FPEL
Quad 2-Input NOR
1B 1A 1Y 2Y 2A 2B
GND
Vcc 4A 4B 4Y 3Y 3B 3A
1 2 3 4 5 6 7
14 13 12 11 10 9 8
•
IC3: YSD917
→
See page 22
•
IC4: YSS918D-F
→
See page 23
•
IC5: IS61C1024-20J
→
See page 26
•
IC6: AK4526A-VQ
→
See page
•
IC7: AK4324-VF-E2
→
See page 26
– +
OUT
1
–IN
1
–V
CC
+V
CC
OUT
2
1
2
3
4 5
+IN
1
–IN
2
+IN
2
– +
6
7
8
27
2V SAMPLE 50ns
0V
Point
r
Pin 39 of IC6
V : 2V/div
H : 50nsec/div
DC range 1 : 1 probe
2V SAMPLE 50ns
0V
Point
e
Pin 9 of IC3
V : 2V/div
H : 50nsec/div
DC range 1 : 1 probe
1
3
2
4
7
10
14
11
12
9
8
13
7
8
3
1
2 5
6
4
5
6
6
8
4
5
7
6
8
5
7
3
2
1
4
3
2
1
AK4324-VF-E2
44
P43
K-3
P42
G-7
P42
C-1