Yamaha YST-SW205 User manual
SERVICE MANUAL
SUBWOOFER SYSTEM
YST-SW205/305
100768
■CONTENTS
TO SERVICE PERSONNEL .......................................... 1
SPECIFICATIONS.......................................................... 2
INTERNAL VIEW ........................................................... 3
REAR PANELS .......................................................... 4~5
DISASSEMBLY PROCEDURES ................................... 6
ADJUSTMENTS ..............................................................
7~8
BLOCK DIAGRAM ......................................................... 9
PRINTED CIRCUIT BOARD .................................. 10~15
SCHEMATIC DIAGRAM ........................................ 16~17
PARTS LIST ........................................................... 18~31
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA
Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the
industry, and more specifically YAMAHA Products, are already
known and understood by the users, and have therefore not been
restated.
WARNING: Failure to follow appropriate service and safety
procedures when servicing this product may result
in personal injury, destruction of expensive
components, and failure of the product to perform
as specified. For these reasons, we advise all
YAMAHA product owners that any service
required should be performed by an authorized
YAMAHA Retailer or the appointed service
representative.
IMPORTANT: The presentation or sale of this manual to any
individual or firm does not constitute authorization,
certification or recognition of any applicable
technical capabilities, or establish a principle-agent
relationship of any form.
The data provided is believed to be accurate and applicable to the
unit(s) indicated on the cover. The research, engineering, and service
departments of YAMAHA are continually striving to improve
YAMAHA products. Modifications are, therefore, inevitable and
specifications are subject to change without notice or obligation to
retrofit. Should any discrepancy appear to exist, please contact the
distributor's Service Division.
WARNING: Static discharges can destroy expensive
components. Discharge any static electricity your
body may have accumulated by grounding yourself
to the ground buss in the unit (heavy gauge black
wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part
replacement. Recheck all work before you apply
power to the unit.
YST-SW205/305
P.O.Box 1, Hamamatsu, Japan
YST-SW205 YST-SW305
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TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
YST-SW205/305
1
WALL
OUTLET
EQUIPMENT
UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic
(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency
(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
■TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked s
and must be replaced with parts having specifications equal
to those originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
●Meter impedance should be equivalent to 1500 ohm shunted
by 0.15µF.
●Leakage current must not exceed 0.5mA.
●Be sure to test for leakage with the AC plug in both polarities.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
YST-SW205/305
■SPECIFICATIONS
YST-SW205 YST-SW305
Type Advanced Yamaha Active Servo Technology ←
Output Power 150 W/100 Hz, 5 Ω10% T.H.D. 200 W/100 Hz, 5 Ω10% T.H.D.
Input Sensitivity
INPUT 1 (SP) 0.8 V (50 Hz, 150 W/5Ω, L+R) 1.0 V (50 Hz, 200 W/5Ω, L+R)
INPUT 2 (PJ) 40 mV (50 Hz, 150 W/5Ω, L+R) 50 mV (50 Hz, 200 W/5Ω, L+R)
Input Impedance
INPUT 1 (SP) 2.2 kΩ←
INPUT 2 (PJ) 12 kΩ←
Frequency Response 23 Hz ~ 170Hz 20 Hz ~ 160Hz
Driver Unit 20 cm (8") cone 20 cm (8") cone
magnetic shielding type x 1 magnetic shielding type x 2
Input Section
INPUT 1 Speaker terminal ←
INPUT 2 RCA pin jack ←
Power Supply
U, C models AC120V, 60Hz ←
A model AC240V, 50Hz ←
B, G models AC230V, 50Hz ←
R, T models AC110/120/220/240V, 50/60Hz ←
Power Consumption 70 W 80 W
Standby Power Consumption 0.8 W 0.8 W
Dimensions (W x H x D) 235 x 485 x 402 mm 235 x 585 x 445 mm
(9-5/16" x 19-1/16" x 15-13/16") (9-5/16" x 23" x 17-1/2")
Weight 15 kg (33 lbs. 1 oz.) 21 kg (48 lbs. 8 oz.)
Finish
All models Black color / Cherry color ←
Accessory Nonskid Pad x 4 ←
U ....... U.S.A. model C ....... Canada model A ....... Australia model B ....... British model
G ....... Europe model R ....... General model T ........ China model
✻Specifications are subject to change without notice due to product improvements.
235 (9-5/16")351 (13-13/16")19
(3/4")
32
(1-1/4")402 (15-13/16")
485 (19-1/16")
• DIMENSIONS
2
235 (9-5/16")394 (15-1/2")19
(3/4")
32
(1-1/4")445 (17-1/2")
585 (23")
Unit : mm (inch)
YST-SW205 YST-SW305
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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YST-SW205/305
YST-SW205/305
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■INTERNAL VIEW
1MAIN (5) P. C. B.
2MAIN (4) P. C. B.
3MAIN (10) P. C. B.
4MAIN (3) P. C. B.
5MAIN (9) P. C. B. [R, T models only]
6MAIN (8) P. C. B. [U, C, A, B, G models]
MAIN (7) P. C. B. [R, T models]
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YST-SW205 YST-SW305
7MAIN (1) P. C. B.
8MAIN (2) P. C. B.
9MAIN (6) P. C. B.
0Power Transformer
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
YST-SW205/305
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3
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Extension cable CB3
CB9CB9
2
2
Front Panel Ass'y
Main (5) P.C.B.
1
(Remove parts in the order as numbered.)
●For exchanging the driver unit
1. Removal of Front Grille
The front grille is fixed to the cabinet with dowels at 6 locations.
As a screwdriver (for slotted head screw) is used for removal, use
special care not to cause damage to the cabinet.
a. Apply the block to the rear panel so as to avoid damage to the
Terminal of the rear panel.
b. Use the screwdriver inserted in the gap between the front grille
and the cabinet (bottom side first), push up the front grille. (Fig. 1)
c. Remove the front grille by lifting it up. (Fig. 1)
2. Removal of Driver unit
a. Remove 4 (8 when YST-SW305) screws (1) in Fig. 2, and
remove the Driver unit.
b. Remove the cable cord.
●For repairing P.C.B.
Repairing P.C.B. is possible without removing front grille.
1. Removal of Front Panel Ass'y
Remove 2 screws (2) and then remove the Front Panel Ass'y in
Fig. 3.
* Use an Allen wrench (3 mm) to unscrew the Front Panel Ass'y.
2. Removal of Rear Panel
Remove 4 screws (3) and 12 screws (4) in Fig. 4, and remove
the rear panel. At this time, disconnect the connector CB3 of
MAIN (2) P.C.B.
* When removing the rear panel, replace the packing.
3. P.C.B. Operation Check
a. Disconnect the connector CB9 of MAIN (5) P.C.B.
b. Connect the connector CB3 of MAIN (2) P.C.B. and CB9 of MAIN
(5) P.C.B. by using an extension cable. (Fig. 4)
Extension cable : V7278000 (9P, 700 mm)
■DISASSEMBLY PROCEDURES
Fig. 1
Fig. 2
Fig. 3
Fig. 4
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TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
YST-SW205/305
7
■ADJUSTMENTS
●Confirmation of Power Amp operation
For the power amplifier which has been repaired, it is
absolutely necessary to confirm that a correct waveform
is obtained at points indicated by Aand
B
in the
schematic diagram according to the following procedure.
Devices required
Signal generator
8 Ωor 6 Ωload resistor
Oscilloscope (dual trace type)
Connection
1) Connect the output signal from the signal generator to the
input terminal of the unit.
2) Disconnect the connector terminal connected to the
speaker unit and reconnect it to the load resistor.
3) Connect the HOT side of the oscilloscope CH1 probe to
the point A or B indicated in the figure and the GND side
to the GND of the main unit.
4) Connect the oscilloscope CH2 input to the red side of the
connector cable, which is connected with the load
resistor.
At this time, the GND terminal of CH2 must be left
unconnected.
Setting
1) Set the signal generator to the sine wave, 100Hz and
minimum output level settings.
2) Set the volume of the unit to the minimum position.
3) Turn on the power to the unit.
4) Adjust the output level of the signal generator and the
volume of the unit so that the output level observed at
oscilloscope CH2 is 28Vp-p.
Waveform observation
With the settings made as described above, observe the
waveform obtained at CH1 for judgment.
●Idling Adjustment
To stabilize operation of the amplifier, turn ON the power
with no input signal and wait for 2 to 3 minutes in non loaded
condition before the adjustment.
Adjust VR1 so that the voltage between terminals TP11 and
TP12 is 30mV to 200mV.
●Confirmation of AUTO STANDBY operation
Setting
1) Turn off the power switch.
2) In order to shorten the time required for operation check;
connect a 10kΩresistor at both ends of R60 on the MAIN
(3) P.C.B.
3) Connect the output signal from the signal generator to the
L/MONO terminal of the unit.
4) Set the signal generator for the sine wave of 100Hz,
8mV.
5) Turn on the power switch.
Confirmation
1) Set the AUTO STANDBY switch to the LOW position.
AUTO
STANDBY
OFF HIGH
LOW
2) Turn on the STANDBY/ON switch.
The display LED lights up (green) and its color changes
to red after 5 to 10 seconds.
3) Turn off the STANDBY/ON switch.
The display LED goes off.
4) Set the AUTO STANDBY switch to the HIGH position.
AUTO
STANDBY
OFF HIGH
LOW
5) Turn on the STANDBY/ON switch.
The display LED lights up (green) and its color remains
unchanged even after time have elapsed.
6) Turn off the STANDBY/ON switch.
The display LED goes off.
After confirmation
1) Turn off the power switch.
2) Disconnect the 10kΩresistor connected to both ends of
R60.
Normal
Point A (Cathode of D29)
V : 20V/div H : 2 msec/div
DC range 1 : 1 probe
Normal
Point B (Anode of D31)
V : 20V/div H : 2 msec/div
DC range 1 : 1 probe
Abnormal
+B or GND level
Becomes constant
Abnormal
-B or GND level
Becomes constant
0V
0V
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TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
YST-SW205/305
Schematic Diagram (Ex.: YST-SW205)
Test Points (Ex.: YST-SW205)
PS AMPPOWER DRIVE
-65.5
-66.7
1.8
65.1
-1.6
-4.2
-4.2
-1.0
-1.0
1.2
1.2
1.8
65.5 4.4
-3.6
-66.7
4.4
66.1
66.1
3.3
-1.6
4
.9
0
-2.7
-2.7
-2.7
-66.7
-66.0
-66.7
-66.7
-2.7
-66.7
-66.7
66.1
65.9
65.7
65.9
2.7
66.1
0.6
0.1
-2.7
-2.7
3.3
0
66.1
66.1
66.1
3.3
1.8
-1.6
-1.0
1.2
-1.0
0.6
-0.5
-0.5
-3.3
-3.6
0.1
66.1
66.0
0.1
66.0 0
2.7
0.1
-66.7
66.1
66.1
66.1
65.5
2.7
2.7
65.5
2.7
2.7
-66.7
-66.3
-66.7
-69.7
IDLING CURRENT ADJ.
DC 30 mV to 200 mV
B
A
Main (1) P.C.B.
Main (2) P.C.B.
DC 30 mV to 200 mV
TP11 (+)
TP12 (-)
VR1
D31
D29
Point A Point B
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TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
ABCDE
1
2
3
4
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9
IC11A IC11B IC7A
AUTO STANDBY
SW3
AUTO POWER
ON/OFF CIRCUIT
VR3
VOLUME
L.P.F.
6dB/oct
B.P.F
Q33—36
L.P.F.
12dB/oct
36
1
576 8IC7B
IC3
Q22, 23
42
D8
D17
D9
D18
Q15
2
HIGH CUT
VR2
PROTECTION
H/L
OFF
PWR
R60
C46
TIMER
IC5
MUSIC
SENSOR
IC4
8
4
6
3
7
Q12
PWR
REGULA
TOR
IC12
Q11
L
R
+
–
–
+
INPUT 1
L
R
INPUT 2
L
R
+
–
–
+
OUTPUT
IC1A
4
32
SW2
PHASE
SELECT
IC1B
L.P.F.
12dB/oct
68
BASS
SELECT
SW4
+
–
PRE DRIVE
Q2—10
Q27—30
POWER DRIVE
Q16A/C, 26A/C
A.N.I.C
LIMITER
RY 1
IC8, 9
Q25
D12, 13, 19
Q18—21
D6, 14, 33, 34
0.1
Q1C, 17C, 24A
Q27, 31
PS AMP
Q1A, 17A, 24C
Q30, 32
PS AMP
–B
+B
H.P.F.
12dB/oct
++
+12
–12
REGULATOR
POWER SUPPL
Y
D2
IC6
IC10
F1
POWER
SW5
+B
–B
POWER SUPPL
Y
D1
STANDBY/ON
SW1
R, T ONL
Y
REGULA
TOR
Q13, 14
D15
SUB
POWER SUPPL
Y
D11
RY 2
T1
+
SPEAKER
YST-SW305
SPEAKER
SPEAKER
YST-SW205
■BLOCK DIAGRAM
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TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
ABCDE
1
2
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YST-SW205/305
MAIN (1) P. C. B. From MAIN (6)
RE
RE
BL
-B1
+B1
E
TR-E
TR-C
TR-B
From
MAIN
(2)
From
MAIN
(2)
DR1+
OUT
DR2+
DR2-
DR1-
+V1
AYST
SPEAKER
SP-
SP+
+
ｰ
18
Q16C
Q1CQ9Q1A
Q17CQ17AQ16A
From
MAIN
(2)
IDLING TEST POINT
DC 30 mV to 200 mV
A
B
■PRINTED CIUCUIT BOARD (Foil side)
YST-SW205
10
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TEL 13942296513 QQ 376315150 892498299
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YST-SW205/305
ABCDE
1
2
3
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11
MAIN (1) P. C. B. From MAIN (6)
RE
RE
BL
-B1
+B1
E
TR-E
TR-C
TR-B
From
MAIN
(2)
From
MAIN
(2)
DR1+
OUT
DR2+
DR2-
DR1-
+V1
AYST
SPEAKERS
SP-
SP+
+
ｰ
SP-
SP+
18
Q16C
Q1CQ9Q1A
Q17CQ17AQ16A
From
MAIN
(2)
+
ｰ
IDLING TEST POINT
DC 30 mV to 200 mV
A
B
■PRINTED CIUCUIT BOARD (Foil side)
YST-SW305
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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YST-SW205/305
ABCDE
1
2
3
4
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YST-SW205/305
■PRINTED CIUCUIT BOARD (Foil side)
YST-SW205 YST-SW305
MAIN (2) P. C. B.
TOVL
E
MA1
BASS
+V2
+12
-12
PWS
VCC
MA1
E
TOVL
BASS
+12
-12
LIM
MA2
From
MAIN
(3)
From
MAIN
(4)
To
MAIN
(5)
VCC
E
E
PWS
+V1
To
MAIN
(1)
DR1+
DR2+
OUT
DR2-
DR1-
AYST
+V1
To
MAIN
(1)
+B1
E
-B1
To MAIN (1)
TR-C
TR-B
TR-E
From MAIN (6)
BE
BL
BE
19
19
IDLING CURRENT ADJ.
12
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
YST-SW205/305
ABCDE
1
2
3
4
5
6
7
13
■PRINTED CIUCUIT BOARD (Foil side)
YST-SW205 YST-SW305
1818
81
MAIN (4) P. C. B.
AUTO
STANDBY
PHASE
LOWHIGH
REVNORM
OFF
OUTPUT / INPUT 1
INPUT 2
LR
+––+
19
From MAIN (3)
SML
SWH2
SWH1
SO
From MAIN (2)
MA2
LIM
-12
+12
BASS
TOVL
E
MA1
MAIN (3) P. C. B.
WH
BE
U, C, A, B, G models: To MAIN (8)
R, T models: To MAIN (7)
To MAIN (10)
GY
OR
To
MAIN
(2)
+V1
PWS
E
E
VCC
To MAIN (4)
SWL
SWH2
SWH1
SO
1819
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
YST-SW205/305
ABCDE
1
2
3
4
5
6
7
YST-SW205/305
MAIN (8) P. C. B.
MAIN (6) P. C. B.
POWER
TRANSFORMER
(U, C, A, B, G models)
WH
BE
From
MAIN
(3)
To
MAIN
(2)
BE
BL
BE
RE
BL
RE
To
MAIN
(1)
YST-SW205 YST-SW305
■PRINTED CIUCUIT BOARD (Foil side)
MAIN (5) P. C. B.
STANDBY / ONB.A.S.S.HIGH CUTVOLUME
From MAIN (2)
TOVL
E
MA1
BASS
+V2
+12
-12
PWS
VCC
19
MAIN (10) P. C. B.
POWER
SW5
From
MAIN
(3)
OR
GY
14
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
YST-SW205/305
ABCDE
1
2
3
4
5
6
7
15
YST-SW205 YST-SW305
■PRINTED CIUCUIT BOARD (Foil side)
MAIN (6) P. C. B.
POWER
TRANSFORMER
MAIN (7) P. C. B.
(R, T models)
From
MAIN
(9)
WH
RE
BL
YE
BR
GR
BE
BE
From
MAIN
(3)
To
MAIN
(2)
BE
BL
BE
RE
BL
RE
To
MAIN
(1)
MAIN (9) P. C. B.
(R, T models)
To MAIN (7)
VOLTAGE
SELECTOR
YEBE
BL BR RE GR
240V 1-2/5-6
220V 2-3/6-7
110V 3-4/7-8
120V 4-5/8-1
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
A
1
2
3
4
5
6
7
8
9
B C D E F G H I J K L
YST-SW205/SW305
SCHEMATIC DIAGRAM (YST-SW205)
E-16/J-12
INPUT 1
µPC4570HA
1
9
M51848L
µPC1237HA
1
8
NJM79M12FA
1: COM
2: IN
3: OUT
NJM78M12FA
1: OUT
2: COM
3: IN
NJM78L08A
OUT
COM IN
x:NOT USED
O:USED / APPLICABLE
NJM4558L
2SA970
2SA1015
2SA1145
2SC1815
2SC2240
2SC2705
2SC2878
ECB
2SK304
ECB
PIN CONNECTION DIAGRAM OF TRANSISTORS,
DIODES AND ICS.
BCE
2SA1837
2SC4793
2SC18462SC4688
2SA1695
2SC4468
1SR139
1SS133
MTZJ3.6B
MTZJ12.0C
MTZJ24.0B
S2L20U
D3SBA20 S1NB20
Anode
Cathode
IC1, 4, 7~9 : µPC4570HA
Dual OP-Amp
IC6: NJM78M12FA
Voltage Regulator
Vcc Vo1-Vm1+Vm1VEE +Vm2-Vm2Vo2Vcc
1 2 3 4 5 6 7 8 9
+ + --
1 2
INPUT
OUTPUT
COMMON
IC10: NJM79M12FA
Voltage Regulator
IC11: NJM4558L
Dual OP-Amp
IC12: NJM78L08A
Voltage Regulator
COMMON
OUTPUT
INPUT
87654321
OUT1
–Vcc
+IN2
–IN2
OUT2
+Vcc
+IN1
–IN1
VIN
VOUT
GND
–
+
~~
~
+
~
–
1
8
BCE
ECB
L.P.F.
L.P.F.
B.P.F.
L.P.F.H.P.F.
PRE DRIVE
LIMITER
POWER SUPPLY
A.N.I.C
PS AMPPOWER DRIVE
POWER SUPPLY
PROTECTION
AUTO POWER ON/OFF CIRCUIT
SUB POWER SUPPLY
★ All voltage are measured with a 10MΩ /V DC electric volt meter.
★ Components having special characteristics are marked sand must be
replaced with parts having specifications equal to those originally
installed.
IC5 : M51848L
CR Timer
IC3 : µPC1237HA
Protector
1
2
53 4
78
6
Overload
detect
Mid-point
potential
detect
Flip flop
circuit
Vcc on
mute
AC OFF
detect
Latch / automatic
return select
Relay
drive
circuit
GND
Vcc
GND
6
4
12 3
TRIGGER
OUT
RESET
REFERENCE
VOLTAGE
THRESHOLD
DISCHARGE
VCC
78
+
–
FLIP-
FLOP
+
–
5
RR R
100
C91
0.01
SG
82K
B220
100/16
0
11.8
8.6
8.0
8.6
0
0
11.8
-11.9
0
0
0
0
0
0
0
0
-11.8
0.7
0
0
0
0
-11.9
0 1.9
0.1
0.6 0
0.1
0
0
0
11.8
0
0
0
7.9
7.3
-11.9
0 0
0 0 00
0.1
0.6
-65.7
0.1
-65.7
-66.6 -65.5
-64.9
-65.5
-66.7
1.8
65.1
0.6
65.6
66.1
65.1
65.1
-1.6
-4.2
-4.2
-1.0
-1.0
1.2
1.2
1.8
65.1
65.5 4.4
-3.6
-66.7
66.1
-66.7
0
0
AC
97.7
4.4
66.1
66.1
3.3
-1.6
-64.9
-65.7
-65.7
-65.7
0.6
-65.7
-66.6
-65.7
0.1-0.1
11.8
0
0
0
0
0
0
0
0
11.8
0
0
-11.9
11.8
-11.9
18.7
-18.7
0
0
18.7
-18.7
0
0
0
0
00
-11.8
0
0
0.3
0
11.8
0
0
0
-1.5
0.7
3.9
3.9
0
7.9
6.7
6.6
0
0
5.2
0
1.4
0
11.8
0.2
11.9
0
7.9
5.7
5.7
0
12.0
0.2
AC
28.9
AC
12.0
6.6
6.46.45.37.96.61.40 7.9
0.7 03.3 2.0 0 0.1 0
6.0
25.1 0.8
6.6
2.1
0
-2.7
-2.7
-2.7
-66.7
-66.0
-66.7
-66.7
-2.7
-66.7
-66.7
66.1
65.9
65.7
65.9
2.7
66.1
0.6
0.1
-2.7
-2.7
3.3
0
66.1
66.1
66.1
3.3
1.8
-1.6
-1.0
1.2
-1.0
0.6
-0.5
-0.5
-3.3
-3.6
0.1
66.1
66.0
0.1
66.0 0
2.7
0.1
-66.7
66.1
66.1
66.1
65.5
2.7
2.7
65.5
2.7
2.7
-66.7
-66.3
-66.7
-69.7
-11.9
0
0
0
IDLING CURRENT ADJ.
DC 30 mV to 200 mV
B
A
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
µPC4570HA
1
9
M51848L
µPC1237HA
1
8
NJM79M12FA
1: COM
2: IN
3: OUT
NJM78M12FA
1: OUT
2: COM
3: IN
NJM78L08A
OUT
COM IN
A
1
2
3
4
5
6
7
8
9
B C D E F G H I J K L
SCHEMATIC DIAGRAM (YST-SW305)
E-17/J-13
YST-SW205/305
x:NOT USED
O:USED / APPLICABLE
NJM4558L
2SA970
2SA1015
2SA1145
2SC1815
2SC2240
2SC2705
2SC2878
ECB
2SK304
ECB
PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
BCE
2SA1837
2SC4793
2SC18462SC4688
2SA1695
2SC4468
1SR139
1SS133
MTZJ3.6B
MTZJ12.0C
MTZJ24.0B
S2L20U
D5SBA20 S1NB20
Anode
Cathode
IC1, 4, 7~9 : µPC4570HA
Dual OP-Amp
IC6: NJM78M12FA
Voltage Regulator
Vcc Vo1-Vm1+Vm1VEE +Vm2-Vm2Vo2Vcc
1 2 3 4 5 6 7 8 9
+ + --
1 2
INPUT
OUTPUT
COMMON
IC10: NJM79M12FA
Voltage Regulator
IC11: NJM4558L
Dual OP-Amp
IC12: NJM78L08A
Voltage Regulator
COMMON
OUTPUT
INPUT
87654321
OUT1
–Vcc
+IN2
–IN2
OUT2
+Vcc
+IN1
–IN1
VIN
VOUT
GND
IC5 : M51848L
CR Timer
IC3 : µPC1237HA
Protector
–
+
~~
~
+
~
–
1
8
BCE
ECB
L.P.F.
L.P.F.
B.P.F.
L.P.F.H.P.F.
PRE DRIVE
LIMITER
POWER SUPPLY
A.N.I.C
PS AMPPOWER DRIVE
POWER SUPPLY
PROTECTION
AUTO POWER ON/OFF CIRCUIT
SUB POWER SUPPLY
E-56/J-52
★ All voltage are measured with a 10MΩ /V DC electric volt meter.
★ Components having special characteristics are marked sand must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
1
2
53 4
78
6
Overload
detect
Mid-point
potential
detect
Flip flop
circuit
Vcc on
mute
AC OFF
detect
Latch / automatic
return select
Relay
drive
circuit
GND
Vcc
GND
6
4
12 3
TRIGGER
OUT
RESET
REFERENCE
VOLTAGE
THRESHOLD
DISCHARGE
VCC
78
+
–
FLIP-
FLOP
+
–
5
RR R
D5SBA20
C91
0.01
SG
33.2
AC
33.8
AC
50.7
AC
9.8
0
11.9
8.7
8.0
8.6
0
0
11.9
-12.0
0
0
0
0
0
0
0
0
11.9
0.7
0
0
0
0
-12.0
0 1.9
0.1
0.7 0
0.1
0
0
0
11.9
0
0
0
8.1
7.5
-12.0
0 0
0 0 00
0.1
0.6
-68.5
0.1
-68.5
-69.6 -69.1
-68.3
-69.1
-69.7
1.7
68.3
0.6
68.8
69.4
68.9
68.3
-1.7
-4.3
-1.1
1.1
1.1
1.7
68.3
68.9 4.4
-3.7
-69.7
69.4
-69.6
0
0
AC
103.2
4.4
69.5
69.5
3.8
-1.7
-68.3
-68.5
-68.5
-68.5
0.6
-68.5
-69.6
-68.5
0.1-0.1
11.9
0
0
0
0
0
0
0
0
11.9
0
0
-12.0
11.9
-12.0
18.2
-18.3
0
0
18.3
-18.2
0
0
0
0
00
-12.0
0
0
-0.3
0
11.9
0
0
0
-1.5
0.7
4.1
4.1
0
8.1
6.9
6.8
0
0
6.6
0
1.4
0
11.7
0.2
11.7 8.1
5.6
5.6
0
11.8
0.2
AC
28.3
AC
11.8
6.6
7.17.15.48.16.81.40 8.1
0.7 03.3 2.1 0 0 0
6.3
24.8 0.8
6.8
2.2
0
0
-2.6
-2.6
-2.6
-69.1
-69.0
-69.6
-69.6
-2.7
-69.4
-69.4
69.4
68.7
69.3
68.7
2.7
69.4
0.6
0
-2.6
-2.6
3.3 0
0
2.7
69.4
69.4
69.9
3.8
1.7
-1.7
1.1
1.1
-1.1
0.6
-0.6
-0.6
-3.3
-3.3
0
69.4
69.4
0
69.3 0
2.7
0
-68.9
69.4
69.3
69.4
68.7
2.7
2.7
68.7
2.7
2.7
-68.9
-69.3
-69.5
-69.7
-12.0
0
0
0
IDLING CURRENT ADJ.
DC 30 mV to 200 mV
A
B
100/16
B220
82K
100
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
YST-SW205/305
YST-SW205/305
18
■WARNING
Components having special characteristics are marked sand must be
replaced with parts having specifications equal to those originally in-
stalled.
●Carbon resistors (1/6W or 1/4W) are not included in the ELECTRICAL
PARTS List. For the parts No. of the carbon resistors, refer to last page.
ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS:
C.A.EL.CHP : CHIP ALUMI.ELECTROLYTIC CAP
C.CE : CERAMIC CAP
C.CE.ARRAY : CERAMIC CAP ARRAY
C.CE.CHP : CHIP CERAMIC CAP
C.CE.ML : MULTILAYER CERAMIC CAP
C.CE.M.CHP : CHIP MULTILAYER CERAMIC CAP
C.CE.SAFTY : RECOGNIZED CERAMIC CAP
C.CE.TUBLR : CERAMIC TUBULAR CAP
C.CE.SMI : SEMI CONDUCTIVE CERAMIC CAP
C.EL : ELECTROLYTIC CAP
C.MICA : MICA CAP
C.ML.FLM : MULTILAYER FILM CAP
C.MP : METALLIZED PAPER CAP
C.MYLAR : MYLAR FILM CAP
C.MYLAR.ML : MULTILAYER MYLAR FILM CAP
C.PAPER : PAPER CAPACITOR
C.PLS : POLYSTYRENE FILM CAP
C.POL : POLYESTER FILM CAP
C.POLY : POLYETHYLENE FILM CAP
C.PP : POLYPROPYLENE FILM CAP
C.TNTL : TANTALUM CAP
C.TNTL.CHP : CHIP TANTALUM CAP
C.TRIM : TRIMMER CAP
CN : CONNECTOR
CN.BS.PIN : CONNECTOR,BASE PIN
CN.CANNON : CONNECTOR,CANNON
CN.DIN : CONNECTOR,DIN
CN.FLAT : CONNECTOR,FLAT CABLE
CN.POST : CONNECTOR,BASE POST
COIL.MX.AM : COIL,AM MIX
COIL.AT.FM : COIL,FM ANTENNA
COIL.DT.FM : COIL,FM DETECT
COIL.MX.FM : COIL,FM MIX
COIL,OUTPT : OUTPUT COIL
DIOD.ARRAY : DIODE ARRAY
DIODE.BRG : DIODE BRIDGE
DIODE.CHP : CHIP DIODE
DIODE.VAR : VARACTOR DIODE
DIOD.Z.CHP : CHIP ZENER DIODE
DIODE.ZENR : ZENER DIODE
DSCR.CE : CERAMIC DISCRIMINATOR
FER.BEAD : FERRITE BEADS
FER.CORE : FERRITE CORE
FET.CHP : CHIP FET
FL.DSPLY : FLUORESCENT DISPLAY
FLTR.CE : CERAMIC FILTER
FLTR.COMB : COMB FILTER MODULE
FLTR.LC.RF : LC FILTER,EMI
GND.MTL : GROUND PLATE
GND.TERM : GROUND TERMINAL
HOLDER.FUS : FUSE HOLDER
IC.PRTCT : IC PROTECTOR
JUMPER.CN : JUMPER CONNECTOR
JUMPER.TST : JUMPER,TEST POINT
L.DTCT : LIGHT DETECTING MODULE
L.EMIT : LIGHT EMITTING MODULE
LED.DSPLY : LED DISPLAY
LED.INFRD : LED,INFRARED
MODUL.RF : MODULATOR,RF
PHOT.CPL : PHOTO COUPLER
PHOT.INTR : PHOTO INTERRUPTER
PHOT.RFLCT : PHOTO REFLECTOR
PIN.TEST : PIN,TEST POINT
PLST.RIVET : PLASTIC RIVET
R.ARRAY : RESISTOR ARRAY
R.CAR. : CARBON RESISTOR
R.CAR.CHP : CHIP RESISTOR
R.CAR.FP : FLAME PROOF CARBON RESISTOR
R.FUS : FUSABLE RESISTOR
R.MTL.CHP : CHIP METAL FILM RESISTOR
R.MTL.FLM : METAL FILM RESISTOR
R.MTL.OXD : METAL OXIDE FILM RESISTOR
R.MTL.PLAT : METAL PLATE RESISTOR
RSNR.CE : CERAMIC RESONATOR
RSNR.CRYS : CRYSTAL RESONATOR
R.TW.CEM : TWIN CEMENT FIXED RESISTOR
R.WW : WIRE WOUND RESISTOR
SCR.BND.HD : BIND HEAD B-TITE SCREW
SCR.BW.HD : BW HEAD TAPPING SCREW
SCR.CUP : CUP TITE SCREW
SCR.TERM : SCREW TERMINAL
SCR.TR : SCREW,TRANSISTOR
SUPRT.PCB : SUPPORT,P.C.B.
SURG.PRTCT : SURGE PROTECTOR
SW.TACT : TACT SWITCH
SW.LEAF : LEAF SWITCH
SW.LEVER : LEVER SWITCH
SW.MICRO : MICRO SWITCH
SW.PUSH : PUSH SWITCH
SW.RT.ENC : ROTARY ENCODER
SW.RT.MTR : ROTARY SWITCH WITH MOTOR
SW.RT : ROTARY SWITCH
SW.SLIDE : SLIDE SWITCH
TERM.SP : SPEAKER TERMINAL
TERM.WRAP : WRAPPING TERMINAL
THRMST.CHP : CHIP THERMISTOR
TR.CHP : CHIP TRANSISTOR
TR.DGT : DIGITAL TRANSISTOR
TR.DGT.CHP : CHIP DIGITAL TRANSISTOR
TRANS : TRANSFORMER
TRANS.PULS : PULSE TRANSFORMER
TRANS.PWR : POWER TRANSFORMER ASS’Y
TUNER.AM : TUNER PACK,AM
TUNER.FM : TUNER PACK,FM
TUNER.PK : FRONT-END TUNER PACK
VR : ROTARY POTENTIOMETER
VR.MTR : POTENTIOMETER WITH MOTOR
VR.SW : POTENTIOMETER WITH ROTARY SW
VR.SLIDE : SLIDE POTENTIOMETER
VR.TRIM : TRIMMER POTENTIOMETER
Note) Those parts marked with “#” are not included in the P.C.B. ass’y.
PARTS LIST
■ELECTRICAL PARTS
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
YST-SW205/305
YST-SW205/305
19
* V7098000 P.C.B. MAIN UC
* V7098100 P.C.B. MAIN RT
* V7098200 P.C.B. MAIN A
* V7098300 P.C.B. MAIN BG
CB1 VB858700 CN.BS.PIN 8P
CB2 VB858400 CN.BS.PIN 5P
CB3 VB858800 CN.BS.PIN 9P
CB4 VB390000 CN.BS.PIN 4P
CB5 VP206500 HOLDER.FUS EYF‑52BCT RT
CB6 VP206500 HOLDER.FUS EYF‑52BCT RT
CB7 VP206500 HOLDER.FUS EYF‑52BCT UCRT
CB8 VP206500 HOLDER.FUS EYF‑52BCT UCRT
CB9 VB390500 CN.BS.PIN 9P
CB10 LB932020 CN.BS.PIN 2P
CB13 VP206500 HOLDER.FUS EYF‑52BCT ABG
CB14 VP206500 HOLDER.FUS EYF‑52BCT ABG
* C1 V6887300 COVER.CAP 0.1uFECQ‑E2104KF
C2 UR837470 C.EL 47uF16V
C3 UR837470 C.EL 47uF16V
C4 UR897100 C.EL 10uF100V
C5 VK534000 C.PP 220pF200V
C6 UR828220 C.EL 220uF10V
C7 UA655100 C.MYLAR 0.1uF50V
C8 UA655470 C.MYLAR 0.47uF50V
C9 UA655820 C.MYLAR 0.82uF50V
C10 UA655470 C.MYLAR 0.47uF50V
C11 VE326400 C.MYLAR.ML 0.22uF50V
C12 UR877470 C.EL 47uF63V
C13 UR877470 C.EL 47uF63V
C14 UR837100 C.EL 10uF16V
C15 VK534000 C.PP 220pF200V
* C16 V6887300 COVER.CAP 0.1uFECQ‑E2104KF
C17 UA655820 C.MYLAR 0.82uF50V
* C18 V7093500 C.EL 7500uF70V
* C19 V7093500 C.EL 7500uF70V
C20 UR848470 C.EL 470uF25V
C21 UR848470 C.EL 470uF25V
C22 UR838100 C.EL 100uF16V
C23 UR838100 C.EL 100uF16V
C24 UM398100 C.EL 100uF16V
C25 UR838100 C.EL 100uF16V
C26 UA653100 C.MYLAR 1000pF50V
C27 UR897100 C.EL 10uF100V
C28 VE326400 C.MYLAR.ML 0.22uF50V
C29 UA655100 C.MYLAR 0.1uF50V
C30 UA655120 C.MYLAR 0.12uF50V
C31 UA654100 C.MYLAR 0.01uF50V
C32 UA654100 C.MYLAR 0.01uF50V
C33 UA654270 C.MYLAR 0.027uF50V
C34 UR837100 C.EL 10uF16V
C35 V5058000 C.MYLAR 4.7uF250V
C36 V5058000 C.MYLAR 4.7uF250V
C37 UA654680 C.MYLAR 0.068uF50V
C38 FG651220 C.CE 22pF50V
C39 FG652120 C.CE 120pF50V
C40 UR749100 C.EL 1000uF25V UCABG
C41 UA654470 C.MYLAR 0.047uF50V
C42 FG644100 C.CE 0.01uF50V
C43 FG613100 C.CE 1000pF50V
C44 UR866100 C.EL 1uF50V
C45 UA654680 C.MYLAR 0.068uF50V
C46 UR838330 C.EL 330uF16V
C47 UR838220 C.EL 220uF16V
C48 UR778470 C.EL 470uF63V RT
C49 VS741700 C.CE.SAFTY 0.01uF275V
C50 FG644100 C.CE 0.01uF50V
C51 UA654470 C.MYLAR 0.047uF50V
C52 UR837100 C.EL 10uF16V
C53 UR837100 C.EL 10uF16V
C54 FG652120 C.CE 120pF50V
C55 FG651220 C.CE 22pF50V
* C56 UR798330 C.EL 330uF100V
C57 UA655100 C.MYLAR 0.1uF50V
C58 UA654220 C.MYLAR 0.022uF50V
C59 UA654220 C.MYLAR 0.022uF50V
* C60 UR798330 C.EL 330uF100V
* C61 VE327000 C.MYLAR.ML 0.68uF50V
C62 VE326300 C.MYLAR.ML 0.18uF50V
C63 VE326400 C.MYLAR.ML 0.22uF50V
C64 VE326400 C.MYLAR.ML 0.22uF50V
C65 UM417100 C.EL 10uF50V
C66 UM417100 C.EL 10uF50V
C67 FG612220 C.CE 220pF50V
C68 UR837100 C.EL 10uF16V
C69 UA654390 C.MYLAR 0.039uF50V
C70 UR837100 C.EL 10uF16V
C71 FG612220 C.CE 220pF50V
C72 UR838100 C.EL 100uF16V
C73 UR838100 C.EL 100uF16V
C74 UR837100 C.EL 10uF16V
C75 UR837100 C.EL 10uF16V
C76 UA654820 C.MYLAR 0.082uF50V
C77 UA654390 C.MYLAR 0.039uF50V
C78 UR827470 C.EL 47uF10V
C79 VA777700 C.CE 220pF50V RTBG
C80 VA761000 C.CE 22pF50V RTBG
C81 UA655390 C.MYLAR 0.39uF50V
C82 VE326400 C.MYLAR.ML 0.22uF50V
C83 FG644100 C.CE 0.01uF50V
C84 UR847100 C.EL 10uF25V RT
* C85 FG644220 C.CE 0.022uF50V
C86 FG644100 C.CE 0.01uF50V
C87 FG644100 C.CE 0.01uF50V
C88 UA654100 C.MYLAR 0.01uF50V
C89 UA654100 C.MYLAR 0.01uF50V
C90 UA654220 C.MYLAR 0.022uF50V
C91 FG644100 C.CE 0.01uF50V
*sD1 VN011300 DIODE.BRG D3SBA204A200V
D2 VR253700 DIODE.BRG S1NB201.0A200V
D3 VD631600 DIODE 1SS133,176
D4 VD631600 DIODE 1SS133,176
D5 VD631600 DIODE 1SS133,176
D6 VD631600 DIODE 1SS133,176
D7 VG442500 DIODE.ZENR MTZJ24B24V
D8 VD631600 DIODE 1SS133,176
D9 VD631600 DIODE 1SS133,176
D10 VD631600 DIODE 1SS133,176
sD11 VR253700 DIODE.BRG S1NB201.0A200V
D12 VD631600 DIODE 1SS133,176
D13 VD631600 DIODE 1SS133,176
D14 VD631600 DIODE 1SS133,176
D15 VU264100 DIODE 1SR139‑400
D16 VG440300 DIODE.ZENR MTZJ12C12V RT
D17 VD631600 DIODE 1SS133,176
D18 VS079300 LED SPR‑39MVW
D19 VD631600 DIODE 1SS133,176
Schm
Ref. PARTNO. Description
Markets
✻New Parts
YST-SW205
Schm
Ref. PARTNO. Description
Markets
✻New Parts
w
w
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x
i
a
o
y
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1
6
3
.
c
o
m
Q
Q
3
7
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5
1
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0
9
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2
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9
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Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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