Yamaha A-S700 Service Manual page 47

A B C
MAIN
1
Page 46 K8 Page 45 H2
to OPERATION (8)_W811 to FUNCTION (2)_CB605
2
3
MAIN (6)
CB101 W101
IC101
6.0
1.0
0
CB102 W102
15.2
IC102 20.8
6.0
15.7
1.0
0
0.7
15.7
MAIN (7)
4
-15.5
-15.5
-20.8
-14.9
5
OUT L
6
7
CB103
8
9
POINT B 1 / Pin5, 2 / Pin6 of CB272
+5M 1 +5M 1
10
/RES 2 /RES 2
POWER cable ON POWER cable OFF
D E F
To POWER TRANSFORMER
MAIN (4)
20.8 20.8
20.8 0
0 20.8
0.7 20.7 -20.8
0 0
0 0
# 20.7
0
0
20.7 20.7 -20.8
-6.5 -20.8
-16.2
58.3
57.7
58.3
57.7 57.7
0.6
57.1 57.1
57.1 58.3
58.3
0 #
1.1
0.6 1.1
0.6
0.6
1.1
0
-0.4
-1.0
0.6
0.6
0
-57.2 -57.1
-57.2 -57.1
-0.5
-0.5
-1.0
-58.3
-1.0
0
-56.6 -56.6
-58.3
-57.2 -0.5
-57.2 #
-57.2
-57.2 -57.1 -58.3
-57.1
-57.8 -57.8
-57.8 -57.8
-57.1
-57.2 -57.1
-57.2 -58.2
-57.2
-57.2
-58.2
-56.6
-56.6
-0.5
-58.2
-1.0 -1.0
0
-0.5
-0.5
-57.2 -57.1
-57.2
-57.1
0
0
-57.7 -57.7
-1.0
-0.4
1.1
0.6
0.6
-57.7 1.1 1.1 58.2
0.6
1.1
58.2
57.1 57.1
57.1
58.2
57.7 57.7
57.7
58.2
Note) Those parts marked with "#" are not included in the P.C.B. ass'y.
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 positions 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, perform discharge by connecting a discharge resistor (5k-ohms/10W) between terminals at following positions. The time required
for discharging is about 30 seconds.
1. C141 on MAIN (1) P.C.B..
2. C142 on MAIN (1) P.C.B.
.
POWER cable ON
G H
IMPEDANCE SELECTOR
HIGH/LOW
5 k-ohms
10 W
20.8
0
0 (46.8)
58.3
0
-20.8
0
-58.2
(-46.7)
5 k-ohms
10 W
58.3
58.1
0
57.9
0
0
0
0
0
0
0
0
0
0
0 57.9
MAIN (1)
1. MAIN 1 P.C.B.
2. MAIN 1 P.C.B.
I J K
WJ36180 WJ36180 WJ36180 WJ36180
CB106
WE10290 WJ61060 WE10290 WE10290 WE10290 WE10290
AC84.8
AC68.1
AC32.3
4.9
4.7
4.7
4.9 4.7
0
0.2
CB272
0
0
0
0
0
0
4.4
9.7
0
MAIN (3)
4.4
To POWER TRANSFORMER
AC OUTLETS
CB253 CB254
CB255 CB256
(23.1)
(23.1)
(5.9)
(~)
(0)
(~)
(7.4)
(0)
(1.0)
(5.9) (7.4)
0.2 AC8.1
IC251 (1.0) (3.5)
(0) (0)
(0.4)
(5.7) (0)
(3.9)
(0) (0)
0 (0) (0) (0)
(3.9)
(0)
IC253
1.0 9.7
Primary ground 0.9
(0) 0
0
0 9.7
0
0.8
MAIN (2)
L M N
A-S700
WJ36180 WJ36180 WJ36180
WE10290 WE10290 WE10290
IC101, 102: LM61CIZ
Temperature sensor
MAIN (5)
R, L models
VOLTAGE
SELECTOR
VOLTAGE SELECTOR
CB293 CB294
230-240V 1-2/5-6
W291B 220V 2-3/6-7
110V 3-4/7-8
W291A
120V 4-5/8-1
To POWER TRANSFORMER
AC IN
MAIN (8)
IC252: TC4013BP
Dual D-type flip flop
RESET1 4
SET1 6 1 Q1
DATA1 5
2 Q1
CL CL
CL
CL
3
CLOCK1 CL
CL
RESET2 10
SET2 8
13 Q2
DATA2 9
12 Q2
CL
CL
CL
CL
CLOCK2 11 CL
CL
V SS 7
VDD 14
Q1 1 14 VDD
Q1 2 13 Q2
CK1 3 12 Q2
RESET1 4 11
CK2
INPUTS OUTPUTS
RESET SET DATA CK Qn + 1 Qn + 1
DATA1 5 10 RESET2
L H * * H L
H L * * L H
SET1 6 9 DATA2 * *
H H H H
L L L L H *
: Don't care
Vss 7 8 SET2 L L H H L
: Level change
L L * Qn˙ Qn˙ ˙ : No change
47