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SUBWOOFER SYSTEM

Soavo-900SW SERVICE MANUAL

POWER STANDBY SLEEP



B.A.S.S. PHASE



MEMORY


PRESET
1 2 3




HIGH CUT VOLUME




WH64300




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




Soavo-900SW
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.




s CONTENTS
TO SERVICE PERSONNEL ......................................... 2 REPAIR PROCEDURES / 11­14
FRONT PANEL ............................................................. 3 DC OFFSET ADJUSTMENT / 14­15
REAR PANELS ......................................................... 3­5 IC DATA ...................................................................... 16
REMOTE CONTROL PANEL ....................................... 6 BLOCK DIAGRAM ...................................................... 17
SPECIFICATIONS / 6 PRINTED CIRCUIT BOARDS .............................. 18­20
DIMENSIONS ................................................................ 7 SCHEMATIC DIAGRAMS .................................... 21­22
INTERNAL VIEW .......................................................... 7 REPLACEMENT PARTS LIST ............................. 23­34
DISASSEMBLY PROCEDURES / 8­10 REMOTE CONTROL .................................................. 35




© 2006 YAMAHA CORPORATION. All rights reserved.
101027 This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.

'06.09
Soavo-900SW




s TO SERVICE PERSONNEL
1. Critical Components Information AC LEAKAGE
Components having special characteristics are marked Z WALL EQUIPMENT TESTER OR
and must be replaced with parts having specifications equal OUTLET UNDER TEST EQUIVALENT
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. INSULATING
TABLE
q Meter impedance should be equivalent to 1500 ohms
shunted by 0.15µF.

q Leakage current must not exceed 0.5mA.

q 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, 125V FUSE."
A V
CAUTION
F1 : REPLACE WITH SAME TYPE 12A, 125V FUSE.
ATTENTION
F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 12A, 125V.



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 REASON 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
Soavo-900SW




before handling food.




About Lead Free Solder

All of the P.C.B.s installed in this unit and solder joints
are soldered using the lead free solder.


Among some types of lead free solder currently available, it
is recommended to use one of the following types for the
repair work.
· Sn + Ag + Cu (tin + silver + copper)
· Sn + Cu (tin + copper)
· Sn + Zn + Bi (tin + zinc + bismuth)

Caution:
As the melting point temperature of the lead free solder is
about 30°C to 40°C (50°F to 70°F) higher than that of the
lead solder, be sure to use a soldering iron suitable to
each solder.



2
Soavo-900SW




s FRONT PANEL




s REAR PANELS
w U, C models




Soavo-900SW




3
Soavo-900SW



w R model w T model




w K model w A model
Soavo-900SW




4
Soavo-900SW



w B, G models w L model




w J model




Soavo-900SW




5
Soavo-900SW




s REMOTE CONTROL PANEL


POWER STANDBY SLEEP



B.A.S.S. PHASE



MEMORY


PRESET
1 2 3




HIGH CUT VOLUME




WH64300




s SPECIFICATIONS

Type / Advanced Yamaha Active Servo Technology II B, G models ......................................... AC 230 V, 50 Hz
Output Power / J model ........................................... AC 100 V, 50/60 Hz
100 Hz, 4 ohms, 10 % T.H.D ............................. 600 W Power Consumption /
Input Sensitivity / (50 Hz, 600 W/4 ohms, L+R) U, C, R, T, K, A, B, G, L models .......................... 180 W
INPUT (SP) .......................................................... 1.2 V J model ............................................................... 120 W
INPUT (PJ) ......................................................... 70 mV Standby Power Consumption /
Input Impedance / .................................................. 0.5 W (reference data)
INPUT (SP) ................................................. 2.2 k-ohms Dimensions (W x H x D) /
INPUT (PJ) ................................................... 12 k-ohms .................................... 410 mm x 461 mm x 461.5 mm
Soavo-900SW




Frequency Response / 18 Hz to 160 Hz (16-1/8" x 18-3/16" x 18-3/16")
Driver / 25 cm (10") cone woofer Weight / ...................................... 32 kg (70 lbs. 9 oz.)
Magnetic shielding type Finish / Birch color (MN)
Input Section / Brown color (MB)
INPUT 1 ............................................. Speaker terminal Dark brown color (MD)
INPUT 2, 3 ................................................ RCA pin jack Black color (BL)
Operation Section / Accessories / ............................... Power cable x1,
Top Panel .......... STANDBY/ON switch, Volume control, Remote control x1, Battery x2,
H-CUT control, LED indicator Speaker cable (4 m) x1 (J model),
Rear Panel ............................................... Power switch, Subwoofer cable (5 m) x1 (J model)
Voltage selector (R, L models) * Specifications subject to change without notice.
Power Supply /
U, C models ......................................... AC 120 V, 60 Hz
U ....... USA model A ....... Australian model
R, L models .... AC 110, 120, 220, 230-240 V, 50/60 Hz C ....... Canadian model B ....... British model
R ....... General model G ....... European model
T model ............................................... AC 220 V, 50 Hz T ....... Chinese model L ....... Singapore model
K model ............................................... AC 220 V, 60 Hz K ....... Korean model J ....... Japanese model
A model ............................................... AC 240 V, 50 Hz



6
Soavo-900SW




s DIMENSIONS



461 (18-3/16")

457 (18")
4
(3/16")




410 (16-1/8") 30 410 (16-1/8") 21.5
(1-3/16") (7/8")
461.5 (18-3/16")


Unit : mm (inch)




s INTERNAL VIEW

q w e r t y




Soavo-900SW

u i o !0


q DRIVER r DIGITAL P.C.B.
w MAIN (4) P.C.B. t MAIN (2) P.C.B.
e MAIN (3) P.C.B. y MAIN (1) P.C.B.
u MAIN (7) P.C.B. (R, L models)
i POWER TRANSFORMER
o MAIN (6) P.C.B.
!0 MAIN (5) P.C.B.


7
Soavo-900SW




s DISASSEMBLY PROCEDURES

(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.


1. Removal of Front Grille Ass'y
* The front grille ass'y is fixed to the cabinet with dowels
at 5 locations.
As a flatblade screwdriver is used for removal, use
special care not to cause damage to the cabinet ass'y.


a. Using the flatblade screwdriver inserted in the gap
between the front grille ass'y and the cabinet ass'y
(bottom side first), push up the front grille ass'y.
(Fig. 1)
b. Remove the front grille ass'y by lifting a metalblade
up. (Fig. 1)
* When installing the front grille ass'y, apply quick-drying
bond or the like to dowels and then fit them into dowel
holes for secure installation. (The front grille ass'y will
come off easily if its dowels are fitted into dowel holes
without applying quickdrying bond or the like.)




q
Soavo-900SW




Cabinet Ass'y


Driver


Front Grille Ass'y




Dowels




Metalblade




Flatblade Screwdriver Dowels




Fig. 1
8
Soavo-900SW



2. Removal of Driver
a. Remove 8 screws ( q ) and then remove the driver. q
(Fig. 1)
* Use an allen wrench (4mm) to unscrew the driver.
b. Disconnect the connector connected to the terminal of
the driver. (Fig. 1)


3. Remove of Rear Panel Ass'y
a. Remove 12 screws ( w ) and then remove the rea
panel ass'y. (Fig. 2) w
* Arrow marks ( ) are printed to identify the screws to
be removed.
* When assembling the rear panel ass'y, check to ensure
that packing is not damaged so as to prevent air leakage
from occurring.
b. Remove CB4, CB5, CB15 (U, C, T, K, A, B, G
models), CB16-17, CB20 and CB22. (Fig. 3)
c. Remove CB13 and CB14. (R, L models) (Fig. 3)




w




Rear Panel Ass'y




Soavo-900SW
Fig. 2



MAIN (1) MAIN (2) DIGITAL
CB20 CB4 CB22




CB5

CB16
CB17

CB15
(U, C, T, K, A. B, G, J models)




CB14 CB13
MAIN (5) MAIN (6) MAIN (7)

Fig. 3 (R, L models)

9
Soavo-900SW



4. Removal of Front Panel Ass'y
Remove 4 screws ( e ) and then remove the front e
panel ass'y. (Fig. 4)


5. Removal of Power Transformer
Remove 4 screws (r ) and then remove the power r
transformer. (Fig. 4)


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.
· Connect all the connectors removed during
disassembly back to the original positions.




Front Panel Ass'y




e
r




Power Transformer




Fig. 4
Soavo-900SW




Supporting Wood




Fig. 5

10
Soavo-900SW




s REPAIR PROCEDURES

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.
· C77 and C80 on the MAIN (1) P.C.B. are dangerous,
for a high voltage is retained there even after the power
is turned off.
Before the repair work, connect about 5k-ohm/10W
resistor between terminals of the capacitor to forced
discharging.
After the repair work, also perform forced discharging
by connecting about 5k-ohm/10W resistor between
terminals of the capacitor.


Replacing Faulty Parts
Described below is the method to diagnose trouble of the
major parts.


FET (Q108, 109, 110, 111)
If a trouble exists, the D-S resistance value should be
close to 0-ohm.
(The normal value should be 1k-ohm or more.)
D




S



G
DS
D




Soavo-900SW
DIGITAL P.C.B. (side A)
S




8 1
1 12 5 4
24 13

D


1 8 1 8




16 9 16 9
S




D




S




11
Soavo-900SW



q Operation Check q
Caution: When taking measurement at the following points
for operation check, do not use a voltmeter or the like which
may cause a failure.

Pin 10 of IC102 Base of Q125
Pin 14 of IC102 Emitter of Q125
Pin 10 of IC103 Base of Q126
Pin 14 of IC103 Emitter of Q126
Gate of Q108 Base of Q127
Gate of Q109 Emitter of Q127
Gate of Q110 Base of Q128
Gate of Q111 Emitter of Q128
D115--118
R166--169

DIGITAL P.C.B. (side A)
5 4
24 13




1 8 1 8
Pin 14 Pin 10 Pin 14 Pin 10

16 9 16 9




DIGITAL P.C.B. (side B)
Soavo-900SW




Required Tools
· Voltmeter
· Signal generator (100Hz, Sine wave)
· 4-ohm load resistor
· Oscilloscope

12
Soavo-900SW



1. Output Voltage Check
a. Disconnect CB22 of the MAIN (1) P.C.B. so that no
load is applied.
b. Connect the power cable of this unit to the AC outlet.
c. Set the "POWER ON/OFF" key of this unit to the "ON"
position and press the "STANDBY/ON" key.
d. Measure the DC voltage between SP+ and GND and
also between SP­ and GND.
Normal value +50V ±5V
between SP+ and GND: +50V ±5V +50V ±5V
between SP­ and GND: +50V ±5V




MAIN (1) P.C.B. (side A)


SP­

SP+




GND


SP+ SP­ GND




Soavo-900SW
e. Set the "POWER ON/OFF" key of the main unit to the
"OFF" position and disconnect the power cable from
the AC outlet.


2. Output Waveform Check
a. Connect the output signal from the signal generator to
INPUT 3 L/MONO.
b. Disconnect the connector connected to the speaker
unit and connect it to the 4-ohm load resistor.
c. Turn on the power of the signal generator and set for
the sine wave, 100Hz and output level minimum.


13
Soavo-900SW



d. Connect the power cable of this unit to the AC outlet.
e. Set the "POWER ON/OFF" key to the ON position and
press the "STANDBY/ON" key.
f. Using the oscilloscope, measure the output waveform
between SP+ and SP­.
g. Increase the output level of the signal generator and
Soavo-900SW volume gradually and measure the
output waveform using the oscilloscope.
h. If the output waveform is not distorted until the output
level reaches 50Vp-p, it is judged as normal.
i. Set the "POWER ON/OFF" key to the "OFF" position
and disconnect the power cable from the AC outlet.




s DC OFFSET ADJUSTMENT

Precaution for handling measuring instrument
As the speaker output is B.T.L. connected, it is necessary
to make the ground side of the measuring instrument to
be connected to the speaker terminal loose.


Condition
· Start adjustment 5 sec or more after the power is
turned on.
· No input signal.
· Non loaded condition


DC offset adjustment
Adjust the potentiometer (VR101) on the DIGITAL P.C.B.
so that the DC voltage becomes 0 ± 80 mV at speaker
output CB22 on the MAIN (1) P.C.B..
Soavo-900SW




MAIN (1) P.C.B. (side A)


DIGITAL P.C.B. (side A)



VR101
8 1
1 12 5 4
24 13




1 8 1 8




16 9 16 9




0 ± 80 mV




14
Soavo-900SW




DIGITAL P.C.B.




Soavo-900SW
VR101




0 ± 80 mV




MAIN (1) P.C.B.



15
Soavo-900SW




s IC DATA
IC7 : LC651152N-4N21-E (MAIN (1) P.C.B.)
8-bit Microprocessor



PG0/AD4 1 30 PA3/AD3 PA0/AD0 27
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 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
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 ALU CSF ZSF
PF0/SI 13 18 PC1 Port D
PF1/SO 14 17 PC0 PD3 24 Serial Serial INT
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

PF0/SI 13 Higher Digit 10 VDD
4/8 bit Port E Port F
PF2/SCK 15 7 VSS

PF3/INT 16

25 26 26 13 16
PE0
PE1

WDR

PF0
PF3




No. Port Name I/O Function
1 PG0/AD4 OUT Standby LED driving output, GREEN
2 PG1/AD5 OUT Standby LED driving output, RED
3 PG2/AD6 A/D Predicted danger detection
4 PG3/AD7 IN STANDBY/ON SW detection
5 AV+ POWER Reference voltage for AD conversion
6 AV- GND Connection for grounding
7 VSS GND Connection for grounding
8 OSC1 CLK Clock
Soavo-900SW




9 OSC2 CLK Clock
10 VDD POWER Power supply +5V
11 RES IN System reset input
12 TEST GND Connection for grounding
13 PF0/SI OUT Preset 1 LED driving output
14 PF1/SO OUT Preset 2 LED driving output
15 PF2/SCK OUT Preset 3 LED driving output
16 PF3/INT IN Remote control signal detection
17 PC0 OUT Power supply relay driving output
18 PC1 OUT Speaker relay output
19 PC2 OUT Low cut filter control A
20 PC3 OUT Low cut filter control B
21 PD0 OUT Motor 1 clockwise revolution
22 PD1 OUT Motor 1 counterclockwise revolution
23 PD2 OUT Motor 2 clockwise revolution
24 PD3 OUT Motor 2 counterclockwise revolution
25 PE0 OUT Phase LED driving output
26 PE1/WDR IN Error detect terminal
27 PA0/AD0 A/D Motor 1 angle detection
28 PA1/AD1 A/D Motor 2 angle detection
29 PA2/AD2 OUT Danger preview input check pulse output
30 PA3/AD3 IN Standby terminal


16
A B C D E F G H

Soavo-900SW

s BLOCK DIAGRAM
1
MAIN
See page 21 SCHEMATIC DIAGRAM A.N.I.C

TE1 IC13,14,Q20-22
+
L IC1A IC2A
6- IC2B MOSFET DRIVER
- 7 2- IC3A VR1 PHASE
1 5+ IC3B Q108 L.P.F WOOFER
INPUT1 + + 7 4+ IC4A VOLUME SELECT
5 2 6+ IC4B XL101 DRIVER L101
- 3 L.P.F. - 8 3- IC5A IC12A
R 6 L.P.F. - 2 6+ 4 IC5B CLOCK 2MHz IC102 MOSFET C153
3 L.P.F. - + 8 + RY3 IC12B RY1 ­
6dB/oct 7 L.P.F. 2 6+ 3 - Q109
+ 12dB/oct 12dB/oct 4 - 8 2 7
7 H.P.F. - - 8 FILTER FILTER
12dB/oct 3 H.P.F. - + + MODULATOR
7 4 L112
12dB/oct L.P.F. 6 IC101
+ 12dB/oct L.P.F. MOSFET +
6dB/oct
H-CUT 6dB/oct Q110 L.P.F
L DRIVER
DRIVER L101
2 - M M
Q7 IC103 MOSFET C153 DRIVER
OUTPUT VR2 VR2 H.P.F Q111
- VR2 Q14,15
SELECTOR MOTOR FILTER
R VR1
MOTOR DRIVER IC9 DRIVER
+
POSITION IC6 IC8 FEEDBACK
SEARCH POSITION IC109
PJ1
L/MONO SEARCH
+5 IC110 +15D
INPUT3 REGULATOR
R -5 IC111 -15D

PJ2
L IC1B PROTECTION
INPUT2 2- Q116,117,121
1
(LFE) + DIGITAL
R 3
See page 22 SCHEMATIC DIAGRAM
3




Q16




19,20 HPCA,HPCB
PROTECTION




M1R,M1F
23,24 M2R,M2F




27 M1A
28 M2A




PH
21,22
+B POWER




25
U1 SUPPLY
REMOTE 26 ERR
RMT 16 D37
CONTROL +15D IC15
3 DTC
SENSOR DIGITAL
4 MICROPROCESSOR 18 SPRY P.C.B. REGULATOR
DRIVER
IC7 17 PWRY
11 RES -15D IC16 Q19
POWER TRANSFORMER
L4
4
M1L,M2L,M3L 13,14,15




8,9
PWG,PWR 1, 2




+15 IC17 AC IN
F1 RY2 POWER ON/OFF
PWS




LED POWER
CLOCK 2MHz SW1
SELECT SUPPLY
REGULATOR
IC10 XL1

-15 IC18 D38
STANDBY/ON
SW4 T2

+5
POWER
REGULATOR SUPPLY
STANDBY/ON, PHASE, B.A.S.S. 1,2,3 RESET IC11
5 PRESET 1,2,3 CIRCUIT D27
Q6
D5-9,11-13




17
6
A B C D E F G H

Soavo-900SW


s PRINTED CIRCUIT BOARDS
1

MAIN (1) P.C.B. (Side A) MAIN (2) P.C.B. (Side A)

OUTPUT
POWER TRANSFORMER POWER TRANSFORMER INPUT 1
(U, C, T, K, A, B, G, J models) 5 k-ohms L R
Point q (Pin 8 of IC7) (R, L models)
10W