Yamaha DSP-E800, Service Manual

Page: 42 / 58

A B C D E F G H
1
2
3
4
5
6
I J K L
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
IC801 — 803 : NJM2068D-D
Dual OP-Amp
– +
OUT
1
–IN
1
–V
CC
+V
CC
OUT
2
1
2
3
4 5
+IN
1
–IN
2
+IN
2
– +
6
7
8
IC804 : LB1641
Motor Driver
2 3
P1
5 IN 1
1 GND
4
VZ
6
IN 2
OUT
1
8
VCC 2
10
OUT
2
9
P2
INPUT LOGIC
PRE DRIVER
7
VCC 1
SYSTEM CONTROL
RESET
POWER
DOWN
DETECT
+ 5V
REGULATOR
FULL
MUTE
DRIVE
4.3
-11.6
-11.6
4.3
4.3
4.8
0.3
0
4.9 4.9
0.3
0.1
1.5
0
0
00
0
11.4
11.4
10.7
7.2 6.6
5.5
5.5
5.5
4.9
4.7
0
0
0
0
4.9
6.6
0.6
0.6
0
0
11.3
w
w
AC 6.5
-23.1
-29.9
-22.7
4.9
-27.3
-27.4
-27.5
-27.6
4.9
~ ~
-29.7 -29.6 -29.6 -29.6 -29.6 -29.6 -29.6 -29.6 -29.7 -29.7 -25.0 -21.0 -27.3 -24.9 -27.3
-8.6 -6.1
-16.5 -18.5 -18.4 -27.6 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -22.7 -22.7
~ ~
-29.7
-29.6 -27.5
-27.5
4.8
4.7
4.8
4.8
4.8
4.4
4.8
4.8
4.8
0
0
0
0
0
0
0
0
-29.6
-29.6
-29.6
-29.6
-29.6
-29.6
-29.6
-29.6
0
1.5
4.8
4.9
0
4.9
4.9
4.8
0.3
0
-27.3 -25.0 -21.0 -27.3 -24.9 -27.3 -8.6 -6.1 -16.5 -18.5 -18.4 -27.4 0
0 0 0 0
0
0 0 0 0 0 0 0 0
2.2
0 0
0
4.8 4.8
4.8 4.8 4.8 4.8 0.1 4.9 4.9
4.7 4.7
2.4
-27.3 -4.8 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 -27.5 ~ ~
-22.7
q
•
IC701: M30218
→
See page 19
•
V701: 16-BT-71GK
→
See page 28
MOTOR
DRIVE
VOLUME AMP
MAIN L
CENTER
CENTER
REAR L
REAR L
11.6
0
0
0
0
0
-11.2
0
0
-11.2
0
0
0
0
0 0.3
0
0.5 0.5
0.7
0.7
0.3 1.7 1.7
11.1
11.1
-11.2
0
0
0
11.6
0
0
0
0
11.6
1
3
8
2
7
6
4
4
5
1
3
8
2
7
6
5
4
1
3
8
2
7
6
5
45
Point
q
(Pin13 of IC701)
V : 2V/div H : 0.1
µ
sec/div
DC range 1 : 1 probe
0V
Point
w
CH1 : Emitter of Q706
CH2 : Collector of Q705
V : 5V/div (CH1) V : 5V/div (CH2)
H : 5 sec/div DC range 1 : 1 probe
(This waveform is not available by pushing
the power switch ON and OFF.)
CH 1
CH 2
AC cord ON
AC cord OFF
P42
E-7
P47
C-4
P42
G-1
P46
I-4
P47
E-3
P46
A-4
P42
K-3