Yamaha Digital Sound Projector HTY-750, Service Manual

Page: 78 / 99

CB501
CB502 CB503
IC502
IC501
IC503
IC506
IC510
IC507
W508
CB504
CB505
W509
W506
W507
IC504
IC511
IC505
A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
YSP-600/HTY-760
78
★
All voltages are measured with a 10M
Ω
/V DC electronic voltmeter.
★ Components having special characteristics are marked
s
and must be replaced
with parts having specifications equal to those originally installed.
★
Schematic diagram is subject to change without notice.
INPUT 2/2
A-2
1 2
AC5.5
AC1.1
AC1.0
AC3.0
AC6.4
(111.6)
(333.7)
5.0
4.0
(4.0)
(5.1)
(15.2)
(1.3)
(113.9)
(332.5)
(476.4)
(33.2)
(33.2)
(1.0)
(1.0)
(1.3)
0
0
0
10.4
0
15.3
5.2
4.0
10.4
0
0
0
11.9 13.8
-24.2
-24.8
0
-26.3 -26.3 0
3.3 4.0 10.2
3.3
0
3.3
(0.8)
(7.6)
(7.6)
(0)
(0)
(0)
(0)
1.0
0.2
0
4.1
0.2
0
(0)
0.1
0
0
0
3.3
4.0
3.3
3.3
10.2
(0.8)
(7.6)
0.1
(4.0)
(3.5)
(3.8)
(0)
(3.9)
(0)
3.9
1.0
4.1
(143.5)
(143.5)
(0) (78.5)
(0)
(78.5)
(3.5)
0.2 0.1
0
(0)
(4.0)
(0)
0
3.3
0
0
0.8
0.1
0
4.0
10.2
11.9
0
13.8
3.4
0
4.3
4.0
0
(15.2)
(4.0)
(15.2)
(0)
(15.2) (-0.1) 5.0
(0.7)
4.0
(0)
(0.7)
(4.0)
(0)
(0.1)
-
+
Error Amp. Star
ter
V
o
ltage
Ref
e
rence
Input Short Circuit
Protection
Ov
er Current
Protection
Over Current
Protection
Rush Current
Protection
Thermal
Protection
IN
1
GND
3
OUT
2
IC506 : AN77L04
Low dropout voltage regulator
IC507 : NJM431U
Adjustable precision shunt regulator
ANODE REFERENCE CATHODE
1 2 3
IC502 : TC4013BP
Dual D-type flip flop
4 RESET1
1 Q1 6 SET1
5 DATA1
CL
3 CLOCK1
CL
CL
CL
CL
CL
2 Q1
10 RESET2
13 Q2 8 SET2
9 DATA2
7
V SS
14 VDD
11 CLOCK2
12 Q2
CL
CL
CL
CL CL
CL
1
2
3
4 11
12
13
14
5
6
7 8
9
10
Vss SET2
CK2
VDD
Q2
INPUTS OUTPUTS
* : Don't care
: Level change
˙ : No change
RESET
L
H
H
L
L
L
Q2
DATA2
RESET2
SET1
RESET1
CK1
Q1
Q1
DATA1
SET
H
L
H
L
L
L
DATA
*
*
*
L
H
*
CK
*
*
*
Qn + 1
H
L
H
L
H
Qn˙
Qn + 1
L
H
H
H
L
Qn˙
IC510 : NJM78M12FA
Voltage regulator
INPUT
OUTPUT
COMMON
POINT A-2 1 / D521, 2 / Q504
1 D521 (C)
Power cable ON Power cable OFF
Q504 (C) 2
Power cable ON
0.8V/0.68V
8.5V/7.9V
5V VCC
ENB
5V REF
3.5V
4V
RT CT
OSC
+0.24V
R
S
QB
Q
ENB
OUT
PUT
16.5V/9V
UVLO
15.5V
15.5V
5.2
µ
A
0.95mA
PWM
0.8V
Dmax
FA5510: 46%
FA5511: 70%
5V Controlled block
FB
(2)
REF
(7)
CS(8) VCC(6)
OUT
(5)
GND
(4)
IS+(3) RT(1)
FF
IC505 : FA5511N-D1-TE1
CMOS IC for switching power supply control
INPUT (1)
Primary side ground
Primary side ground
AC IN
to DSP_CB203
Page 75 K4
to INPUT (3)_CB901
Page 77 H7
to INPUT (2)_CB8
Page 77 E6
to INPUT (2)_CB7
Page 77 H2
to DSP_CB607
Page 76 H9
to INPUT (2)_CB4
Page 77 H4
注意！
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。
・ 下記箇所には電源をOFFにした後も電荷が残り、高電圧が維持されており危険です。
修理作業前に放電用抵抗（5 kΩ/10 W）を下記箇所の端子間に接続して放電してください。放電所用時間は約30秒間です。
1. INPUT （ 1 ） P.C.B. のC502
2. INPUT （ 1 ） P.C.B. のC523
CAUTION !
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. C502 on INPUT (1) P.C.B..
2. C523 on INPUT (1) P.C.B.
.
5 k-ohms
10 W
5 k-ohms
10 W