Yamaha YSP-3000 Service Manual page 85

A B C
POWER 1/2
1
2
3
4
AC IN
CB501
5
6
(0)
(65.7)
(66.6)
(166.6)
5 k-ohms
7 10 W
(166.6)
8
IC502: MIP2F40MSSCF
9
For switching power supply control
VCC DRAIN
VCC UV
regulator
7.5V
VDD
VCC OVP 5.7V
CL Constant 6.6V
24V
current resource Overheat S Q VDD clamp circuit
5.9V
VCC UV
protection R Q
Restart 5.1V
trigger
Oscillator
Gate driver
[LM ]
variable MAXDC
circuit (5-100%)
12KHz
S Q
Power
IN CLOCK
R Q MOSFET
10
ICL_LOW
Blankin g pulse
VCL_OUT
generation
27%
[LM ]
22% circuit in on-state
FB compensation
Light load detection
For intermittent
Oscillation control
Drain current
VCL for detection
clamp circuit
[LM setting] SOURC
D E F
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. C504/C505 on POWER (1) P.C.B..
2. C518 on POWER (1) P.C.B.
.
5 k-ohms
10 W
(59.8)
(0) (164.1)
(59.0)
(238.3) (238.3)
(163.8)
(0)
(1.5)
IC505 16.0
(15.5)
(1.9)
(4.0) 15.5
(0.5) (4.0)
(2.7)
(2.7) (0.7) (15.6)
IC501 11.1
(15.6)
(0) (15.6)
(1.9)
(0) 10.7 (0)
Primary side ground
(7.8)
(1.0) 0.1
(1.0) IC506 0.1
(3.9) (7.8) 1.0
(3.9)
(0) 0
(0)
Primary side ground
6.8
0 6.8
(166.6)
6.8
0
(166.6)
(11.8) (0)
(0)
(255.7)
0 4.4
(166.6)
6.8
IC502
(11.8) 4.4
(2.4)
(0) (1.1)
(5.9)
(0)
IC503
0
(1.1)
0
(5.9) 0
4.4
Primary side ground
IC508, 512: NJM431U
IC504: FA5511N-D1-TE1 IC507: R1154N033B-TR-F
CMOS IC for switching power supply control Voltage regulator Adjustable precision shunt regulator
CS(8) VCC(6)
Thermal
Shutdown
REF
5.2µA 15.5V V 3 1 V OUT
(7) 0.8V/0.68V DD
5V VCC
0.95mA
UVLO
ENB 15.5V
4 NC
5V REF
Vref
8.5V/7.9V
16.5V/9V
0.8V REFERENCE
OUT
3.5V Short Current
ENB (5)
Protection Limit
FB
4V Circuit Circuit
(2) OUT
PUT
PWM CE 5 2 GND
Dmax GND
FA5510: 46% OSC
(4)
FA5511: 70% R
RT CT QB
+0.24V
Q
S Pin No. Symbol Description
Output Pin for Voltage Regulator
FF 1 V OUT
2 GND Ground
5V Controlled block
3 V Power Supply Pin
DD
RT(1) IS+(3) 4 NC B Version No Connection
5 CE Chip Enable Pin (active at "H")
G H
1. POWER 1 P.C.B.
2. POWER 1 P.C.B.
0
(163.9)
12.1
0
15.5
0
0 12.9 16.0
(-0.2)
16.0
10.7
0
0
-32.7
0 -36.6 -36.6 -32.1
C-1
2 1
C-2
3.2
3.2
3.3
4.4 3.3
0
3.2
IC507
0
3.3
3.2
0 4.4
0
0
0
4.4
0
0.8
6.8
0.2
0
0.2
4.4
IC509: NJM78M12FA IC510, 511: NJM78M05FA
Voltage regulator 3-terminal positive voltage regulator
INPUT
OUTPUT
1 2 3
ANODE CATHODE
COMMON
I J K
CB504
12.1 5.0
12.1 IC510
5.0
0
12.1 5.0
CB505
12.1 IC511
5.0
0
11.9
IC509
3.3
4.1
0
CB506
CB507
CB508
POWER (1)
POINT C-1 C-2 1 / Pin 1 of IC507, 2 / Q505 (C)
IC507 1pin 1
IN
Q505 (C) 2
OUT
AC cable ON
AC cable OFF
GND
# All voltages are measured with a 10MΩ/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.
L M N
YSP-3000/YSP-30D/HTY-7030
IC507 1pin 1
Q505 (C) 2
AC cable ON
85