Yamaha DSP-E800 Service Manual page 41

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