Text preview for : Yamaha-YSTSW1500 actsub.pdf part of Yamaha YSTSW1500 active subwoofer
Back to : Yamaha-YSTSW1500 actsub.p | Home
SUBWOOFER SYSTEM
YST-SW1500 SERVICE MANUAL
V983440
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.
I CONTENTS
TO SERVICE PERSONNEL .......................................... 2 IC DATA ....................................................................... 15
YST-SW1500
FRONT PANEL .............................................................. 2 BLOCK DIAGRAM ....................................................... 16
REAR PANELS .......................................................... 3~4 PRINTED CIRCUIT BOARD .................................. 17~21
SPECIFICATIONS .......................................................... 5 IC BLOCK ..................................................................... 22
DISASSEMBLY PROCEDURES ............. 6~7 PIN CONNECTION DIAGRAM ................................... 22
SERVICE POSITION 7 SCHEMATIC DIAGRAM .............................................. 23
REPAIR PROCEDURES 8~11 PARTS LIST ........................................................... 25~37
ADJUSTMENT 12~14 REMOTE CONTROL .................................................... 38
Parts List for Carbon Resistors ................................ 39
Copyright 2002 YAMAHA CORPORATION
100828 This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission. P.O.Box 1, Hamamatsu, Japan
YST-SW1500
I TO SERVICE PERSONNEL AC LEAKAGE
WALL EQUIPMENT TESTER OR
1. Critical Components Information OUTLET UNDER TEST EQUIVALENT
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 INSULATING
from supply circuits. TABLE
G Meter impedance should be equivalent to 1500 ohm shunted G Leakage current must not exceed 0.5mA.
by 0.15µF. G Be sure to test for leakage with the AC plug in both polarities.
"CAUTION"
"F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 12A,
250V FUSE."
CAUTION
F1: REPLACE WITH SAME TYPE 12A, 250V FUSE.
ATTENTION
F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 12A, 250V.
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.
I FRONT PANEL
YST-SW1500
2
YST-SW1500
I REAR PANELS
U, C models
A model B model
YST-SW1500
3
YST-SW1500
G model K model
J model
YST-SW1500
4
YST-SW1500
I SPECIFICATIONS /
Type / Advanced Yamaha Active Servo Technology Power Supply /
Output Power / 1kW (100 Hz, 5 ohms 10% T.H.D.) U, C models ........................................................ AC 120 V, 60 Hz
A model ............................................................... AC 240 V, 50 Hz
Input Sensitivity /
B, G models ........................................................ AC 230 V, 50 Hz
INPUT1 (SP) ........................ 1.0 V (50 Hz, 1 kW / 5 ohms, L + R)
K model ............................................................... AC 220 V, 50 Hz
INPUT2 (PJ) ....................... 50 mV (50 Hz, 1 kW / 5 ohms, L + R)
J model .......................................................... AC 100 V, 50/60 Hz
INPUT3 (PJ) ....................... 50 mV (50 Hz, 1 kW / 5 ohms, L + R)
Power Consumption /
Input Impedance /
U, C, A, B, G, K models ...................................................... 250 W
INPUT1 (SP) ................................................................ 2.2 k-ohms
J model ................................................................................ 185 W
INPUT2 (PJ) .................................................................. 12 k-ohms
INPUT3 (PJ) .................................................................. 12 k-ohms Standby Power Consumption / 1.0 W
Dimension / (W x H x D) ................... 420 x 511 x 448 mm
Frequency Response / 16 Hz to 160 Hz
(16-9/16" x 20-1/8" x 17-6/8")
Driver / 12" Cone, Magnetic Shielding Type Weight / 29.0 kg (63 lbs. 15 oz.)
Input Section / Finish /
INPUT1 .............................................................. Speaker Terminal Cherry color ......................................... U, C, A, B, G, K, J models
INPUT2 ............................................................................. Pin Jack Black color ................................................ U, C, A, B, G, J models
INPUT3 ............................................................................. Pin Jack
Included Accessories /
I/O PORT .......................................................... 3.5 mm Mini Jack Power Cable x 1 pc (U, C, G, K, J models), Speaker Cable (4 m) x
Output Section / 2 pcs (J model), Pin Cable for Subwoofer (3 m) x 1 pc (J model),
H.P.F. OUT ...................................................................... Pin Jack Non-skid Pad x 4 pcs, Remote Control x 1 pc, Battery (AA, R6,
I/O PORT .......................................................... 3.5 mm Mini Jack UM-3) x 2 pcs, Grounding Cable
Operation Section /
Front Panel ....... S T A N D B Y / O N S w i t c h , B . A . S . S . S w i t c h ,
* Specifications are subject to change without notice due to product
VOLUME Control, HIGH CUT Control improvements.
Rear Panel ....... Power Switch, Auto Standby Switch (HIGH /
LOW / OFF), H.P.F. Switch (80 Hz / 100 Hz)
U .......... U.S.A. model C ...... Canadian model
A .......... Australian model B ...... British model
G .......... European model K ...... Korean model
J ........... Japanese model
· DIMENSIONS
420 (16-9/16") 448 (17-5/8")
YST-SW1500
420 (16-9/16")
511 (20-1/8")
Unit : mm (inch)
5
YST-SW1500
I DISASSEMBLY PROCEDURE
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
1. Removal of Front Panel Ass'y
a. Remove 4 screws (1) and then remove the Front Panel
Ass'y. (Fig. 1)
* Use an Allen wrench (3mm) to unscrew the Front
Panel Ass'y.
b. Remove CB7 and CB8. (Fig. 1)
Front Panel Ass'y
1
CB7
CB8
1
Fig. 1
2. Removal of Rear Panel Ass'y
a. Remove 12 screws (2) and then remove the Rear
Panel Ass'y. (Fig. 2)
* Arrow marks ( ) are printed to identify the screws to
be removed.
* When assembling the Rear Panel Ass'y, check to
ensure that the gasket is not damaged so as to
prevent air leakage from occurring.
b. Remove CB1, CB3 and CB6. (Fig. 2)
YST-SW1500
Rear Panel Ass'y
2
2
Fig. 2
6
YST-SW1500
3. Removal of Driver
a. Remove 8 screws (3) and then remove the Base
Ass'y. (Fig. 3)
b. Remove 8 screws (4) and then remove the Driver.
(Fig. 3)
3
3 3
3
4 4
Fig. 3
· Installation of emblem
a. Put the emblem into the cabinet at the specified
position.
b. Place a piece of cloth/wood on top of the emblem.
c. Using a mallet, hammer the emblem in place through
the cloth/wood.
* Use special care not to cause damage to the
emblem or cabinet while hammering the emblem.
I SERVICE POSITION
When checking the P.C.B.:
· To help lift the power cable connecting section of the
rear panel, put the supporting wood under the rear
panel assembly.
· Use the extension cable for servicing for the following 2
sections. MAIN (2) P.C.B. CB1 POWER (2) P.C.B. CB8:
MAIN (2) P.C.B. CB1 POWER (2) P.C.B. CB8: V9956600 (6P 700mm)
V9956600 (6P 700mm) MAIN (1) P.C.B. CB3 POWER (2) P.C.B. CB7:
MAIN (1) P.C.B. CB3 POWER (2) P.C.B. CB7: V9956700 (11P 750mm)
V9956700 (11P 750mm)
YST-SW1500
Supporting Wood
Extension Cable
CB3
POWER (2) P.C.B.
CB8 CB7
MAIN (1) P.C.B. MAIN (2) P.C.B. CB1
Fig. 4 7
YST-SW1500
I REPAIR PROCEDURES
When the power amplifier has failed, it is possible that the
switching power supply section has also failed. Therefore,
it is recommended to separate the power amplifier section
and the switching power supply section for the repair work.
1. Separating power amplifier section
and switching power supply section
Disconnect CB4 and CB5 of the MAIN (1) P.C.B.,
thereby the power amplifier section and the switching
power supply section will be separated.
2. Repairing power amplifier (MAIN (1)
P.C.B.)
Described below is the method to diagnose trouble of
the major parts.
FET (Q29, Q30, Q34, Q35, Q41~44)
Check the resistance between G and S to determine if
any trouble exists.
If a trouble has occurred, the G-S resistance should
indicate a value close to 0.
If no trouble exists, the G-S resistance value should be
as follows.
Q29, Q30, Q34, Q35: about 820
Q41~44: about 115
FET TR
Transistors (Q22A, Q22C, Q28A, Q28C, Q33A, Q33C,
Q39A, Q39C)
Use the diode characteristics between B and E, B and
C to determine if any trouble exists.
GD BC
S E
Operation check
1) Prepare a stabilized DC power source. No load
resistance is needed.
2) Set the output voltage of the stabilized DC power
source to +30V and -30V.
3) Connect the +B terminal of the stabilized DC power
source to JY201, -B terminal to JY202 and GND
terminal to GND. (Fig. A)
4) Connect the probe of the oscilloscope to R170 and
YST-SW1500
GND. (Fig. A)
5) Connect the output terminal of the signal generator
to J57 (=base of Q16) via 100µF 16V +5.6k and the
GND terminal to GND.
6) Set the output signal of the signal generator to sine
wave, 100Hz.
7) Turn on the stabilized DC power source.
8) Raise the output level of the signal generator
gradually and check the output waveform on the
oscilloscope.
9) If the output waveform is not distorted up to 40Vp-p
output level, the operation is OK.
After confirming operation, disconnect the stabilized
DC power source, signal generator and 100µF 16V.
8
YST-SW1500
Oscilloscope
MAIN (1) P.C.B.
Q42
Q44 Q22A Q39C
Q28A Q33A
Q35
Q30
R170
Ground side of probe Q20
Q28C Q33C
Q29
Q34 Q22C Q39A
J57
Q43 Q16
Q41
GND
JY202
JY201
CB5
CB4
YST-SW1500
GND OUT
Signal Generator
GND Stabilized DC Power Source
Set to -30. Set to +30.
Fig. A
9
YST-SW1500
3. Repairing switching power supply
section (POWER (1) P.C.B.)
To avoid possible danger:
C102 and C103 are dangerous, for a high voltage is
retained there even after the power is turned off.
Before the repair work, connect about 100 5W
resistance between terminals of the capacitor to forced
discharging.
After the repair work, also perform forced discharging
by connecting about 100 5W resistance between
terminals of the capacitor.
Replacing faulty parts
Described below is the method to diagnose trouble of
the major parts.
Transistors (Q51, 52)
If a trouble exists, the C-E resistance value should be
close to 0.
Operation check
1) Connect the probe of the oscilloscope between TP3
and TP4.
2) Turn on the POWER switch.
3) Turn on the STAND/BY switch. RY2 turns on and the
SW power source is activated.
4) Check the waveform on the oscilloscope.
5) About 12 seconds later, RY2 turns off and the
waveform on the oscilloscope disappears at the
same time.
This does not mean any abnormality but indicates
that the protection circuit is at work because CB5 is
disconnected.
In order to check this, connect CB5 and turn on the
STANDBY/ON switch. Then RY2 turns on and the
SW power source is activated. Watch the waveform
on the oscilloscope to check that RY2 does not turn
off.
After operation check
Be sure to turn off the POWER switch.
YST-SW1500
Caution
Never connect the oscilloscope to any other part after
the operation check because it is dangerous with a high
potential applied to its ground side.
Also, use care not to touch the frame of the
oscilloscope due to the same reason.
10
YST-SW1500
Oscilloscope
POWER (1) P.C.B.
Caution: Use the AC range.
TP3
RY2
Ground side of probe
TP4
C103
Q52
C102
Q51
YST-SW1500
Fig. B
11
YST-SW1500
I ADJUSTMENT
· Confirmation of Power Amp section
operation
For the power amplifier section which has been repaired, it
is absolutely necessary to confirm that a correct waveform
is obtained at points indicated by A and B in the schematic
diagram according to the following procedure.
Devices required
Signal generator (100Hz sine wave)
8 or 6 load resistor
Oscilloscope (dual trace type)
Connection
1) Connect the output signal from the signal generator to
the L/MONO terminal.
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) Turn on the power to YST-SW1500.
3) Adjust the output level of the signal generator and the
volume of YST-SW1500 so that the output level
observed at oscilloscope CH2 is 70Vp-p.
Waveform observation
With the settings made as described above, observe the
waveform obtained at CH1 for judgment.
Normal
YST-SW1500
Abnormal Abnormal
+B or GND level -B or GND level
becomes becomes
constant constant
12
YST-SW1500
·Idling Adjustment
To stabilize operation of the amplifier, turn ON the power
with no input signal and wait for 1 or 2 minutes in non
loaded condition before the adjustment.
Adjust VR1 so that the voltage between terminals TP1 and
TP2 is DC 30mV to 150mV.
Point B Point A
DC 30 mV
to 150 mV
MAIN (1) P.C.B.
TP2
Q42
D35
DC 30mV
Q44
to 150mV
Q35
TP1
Q30
YST-SW1500
Q20
Q29
Q34
Q43
D38
Q41
Point A Point B
13
YST-SW1500
· AUTO STANDBY operation check
Setting
1) Turn off the POWER switch.
2) Set the AUTO STANDBY/sensing switch to OFF.
3) Connect the output of the signal generator to the L/
MONO terminal.
4) Set the signal generator for the sine wave, 100Hz,
10mV.
Starting test mode
Turn on the POWER switch while pressing the STANDBY/
ON key and B.A.S.S. key simultaneously. Keep pressing
these keys for 5 seconds or more, and the test mode will
be activated.
Display in test mode
The STANDBY/ON LED lights up in green.
At this time, MUSIC/MOVIE and PHASE LED's light up as
well.
Confirmation
1) Change the AUTO STANDBY/sensing switch setting
from OFF to LOW.
5 seconds later, the STANDBY/ON LED changes from
green to red.
At the same time, MUSIC/MOVIE and PHASE LED's go
off.
2) Change the AUTO STANDBY/sensing switch setting
from LOW to OFF.
The STANDBY/ON LED changes from red to green.
At this time, MUSIC/MOVIE and PHASE LED's light up
as well.
YST-SW1500
3) Change the STANDBY/sensing switch setting from
LOW to HIGH.
The STANDBY/ON LED remains unchanged in green.
Canceling test mode
Turn off the POWER switch.
14
YST-SW1500
I IC DATA
IC12 : LC651152N (POWER P.C.B.)
µ-COM
PG0/AD4 1 30 PA3/AD3 PA0/AD0 27
1
PG1/AD5 2 29 PA2/AD2 Port A RAM
PA3/AD3 30 PC ROM
PG2/AD6 3 28 PA1/AD1 F WR
I/O Buffer
PG3/AD7 4 27 PA0/AD0 AV+ 5
1 STACK 1
8 bit
AV+ 5 26 PE1/WDR AV- 6 ADC
DP
AV- 6 25 PE0 STACK 8 IR I. DEC
VSS 7 24 PD3 PG0/AD4 1
Port G
OSC1 8 23 PD2 PG3/AD7 4
System Bus
OSC2 9 22 PD1
PC0 17
1
VDD 10 21 PD0 Port C
RES 11 20 PC3 PC3 20 STS
E AC CF ZF EXTF TMF TM CTL
TEST 12 19 PC2 PD0 21
1 ALU CSF ZSF
PF0/SI 13 18 PC1 Port D
PF1/SO 14 17 PC0 PD3 24 Serial Serial INT
1 Serial Mode Mode
PF2/SCK 15 16 PF3/INT PF1/SO 14 Shift Register Register
Register 8 OSC1
4/8 bit OSC
9 OSC2
Lower Digit
I/O Bus
Serial 11 RES
4 bit Shift
Register 12 TEST
1
PF0/SI 13 Higher Digit 10 VDD
4/8 bit Port E Port F
1
PF2/SCK 15 7 VSS
1
PF3/INT 16
8
25 26
23 23
26 13
8 16
23
PE0
PE1
WDR
PF0
PF3
No. Port No. I/O Function name Detail of function
Standby LED driving output, GREEN
Standby LED driving output, RED
Predicted danger detection
STANDBY /ON SW detection
Reference voltage for AD conversion
Connection for grounding
Connection for grounding
Clock
Clock
Power supply +5V
System reset input
Connection for grounding
Preset 1 LED driving output
Preset 2 LED driving output
Preset 3 LED driving output
Standby terminal
Power supply relay driving output
B.A.S.S. switch detection
MUSIC LED driving output
MOVIE LED driving output
YST-SW1500
Motor 1 clockwise revolution
Motor 1 counterclockwise revolution
Motor 2 clockwise revolution
Motor 2 counterclockwise revolution
Phase LED driving output
Error detect terminal
Motor 1 angle detection
Motor 2 angle detection
Auto Standby detection
Remote control signal detection
Standby terminal
15
YST-SW1500
16
YST-SW1500
+B
VR1 PRE DRIVE POWER DRIVE Q24, 28C, 33C,
+ VOLUME B.P.F. Q12 ~ 19 Q29, 30, 34, 35 39A, 41, 43
L
IC11 IC11 IC23 IC23 IC22 IC22 IC6A Q3, 4, 5, 7 IC6B
1 +
+ SPEAKER
INPUT 1 PHASE BASS
L.P.F. L.P.F. L.P.F. H.P.F. SELECT SELECT Q25, 28A, 33A,
6dB/oct. 12dB/oct. 12dB/oct. 12dB/oct. A-YST 39C, 42, 44
M
R IC1, 2, Q21,
Q6 B
+ D8, 9, 12 Q37, 38
IC16
M A.N.I.C
I BLOCK DIAGRAM
HIGH CUT HIGH CUT
+
VR2 VR2
L R234
IC13 0.22 x 2
OUTPUT Q47
R
+ Q26, 27, 32,
IC15 PROTECTION
D24, 29, 30
23, 24 M2R, M2F
21, 22 M1R, M1F
20 BSR
3 ERR
26 ERR
L IC12
µ-COM 25 PH
INPUT 2 REGULATOR D59
T2
R IC19A
+5V IC5
17 PW
29 TMR
30 RMT
SW2 +8V IC7
H.P.F.
12dB/oct. 80/100Hz
Q50
L IC24
IC19B D68
INPUT 3
REGULATOR
R
IC3
H.P.F. SW2
12dB/oct. 80/100Hz
T3
POWER SUPPLY +15V
16 7
L +B DRIVER P.W.M
MUTING IC9 IC8
H.P.F. OUTPUT 15
Q1, 2
R
14 8 IC17,
B
Q53~56,
Q51, 52, POWER
TH1
D60, 61, SW5
MUSIC POWER SUPPLY D64, 65 F1
13 6 FI1 L7
SENSOR
IC4 RY2
12
IC10, 14
IN REMOTE
REMOTE D41 CONTROL
11 3
SENSOR
OUT U1
SWITCHING POWER SUPPLY
A B C D E F G H I J
YST-SW1500
1 · Semiconductor Location
I PRINTED CIRCUIT BOARD (Foil side)
D1 G4 Q3 F6
POWER (1) POWER (1) D2 F6 Q4 F6
MAIN (1) P. C. B. (Lead Type Device) D3 F7 Q5 F5
VHI
VHI
D4 E7 Q6 G4
D5 E6 Q7 F5
C140
D6 F4 Q8 F7
G5
D7 G4 Q9 F7
D8 F6 Q10 E7
1
D9 F7 Q11 E7
2
D10 F3 Q12 F4
POWER
D11 F3 Q13 F3
(1) D12 G7 Q14 F4
D13 E4 Q15 F3
9
+5 D14 E6 Q16 F4
+B
PW D15 C4 Q17 G3
E POWER D16 C4 Q18 E3
(2) D17 C6 Q19 G4
D18 C6 Q20 B5
D19 D5 Q21 F7
ERR
3 PW D20 D4 Q22A E6
PH
BASS D21 D6 Q22C E4
DT