The Dramatically Different

Subwoofers

YST-SW800/YST-SW320
Advanced YST and QD-Bass Subwoofers. High Power and Superb Bass Clarity.
The Latest Advance in the Audio Reproduction Excell
Yamaha has a tradition of excellence in creating fine sound that goes back more than a century to when we made our first reed organs. Today, we combine extensive expertise in both sound production (musical instruments) and reproduction (audio and acoustics), making us uniquely capable of creating innovative products to enrich peoples lives. As the worlds leading musical instrument manufacturer, we use our acoustic craftsmanship to develop a wide range of superior products. Our wideranging capabilities, including woodworking and metallurgical expertise, are put to good use in the creation of audio speakers. Having established our preeminence in the audio field with legendary products like the NS-1000M monitor speakers, we are now further expanding home entertainment possibilities with an exciting new range of products, of which the YST-SW800 and YST-SW320 Subwoofers are outstanding examples.

The Dramatically D

Yamaha Tradition of ence.
Subwoofers for the Digital Era
Now that audio and video have largely moved to digital formats, the demands on speaker systems are greater than ever. The latest home theater systems, in particular, not only use high-performance DVD players, but also exploit the merits of advanced sound processing formats like Dolby Digital and DTS Digital Surround. Full audio enjoyment of these digital sources requires deep, clear bass response. This is especially true with 5.1 (6.1)-channel sound, because the sixth channel is dedicated to the bass frequencies. That means you not only need a subwoofer, but a subwoofer capable of handling extremely low frequencies and high power levels, as well as accurately reproducing the high quality digital sound. Your best choice? The YST-SW800 and YST-SW320 Subwoofers.

YST-SW800

YST-SW320

fferent Subwoofers

Innovative Design and Technology Impressive Subwoofer Performance.
25mm (1") MDF Cabinet
The beautifully finished cabinet uses ultra-thick (25mm; 1") medium density fiberboard for minimum resonance.

Advanced YST

A unique system in which the speaker and amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion.
The YST-SW800 and YST-SW320 use Yamahas Advanced YST, as well as brand new technologies such as QD-Bass to deliver exceptionally crisp, clean, powerful bass. They have extremely efficient, highpower amplifiers built in, and use extralong stroke, drivers that provide outstanding power with low distortion. The YST-SW800 also introduces new power supply technology and a driver featuring a Dual-Bias system with a 100mm (4") diameter voice coil for the ultimate in power and performance. But whichever Yamaha subwoofer you choose, youll get dynamic bass that will bring out the full potential of your digital music and movie sources.

Extra-Long Stroke Drivers
Extra-long stroke, pure spruce multi-range drivers provide outstanding power with low distortion.

High Power Amplifier

The YST-SW800 amplifier is extremely efficient and features an entirely new type of power supply with superior load characteristics, minimal noise, higher efficiency and greater stability.

QD-Bass Technology

QD-Bass (Quatre Dispersion Bass) technology uses down-firing drivers with square, pyramid-shaped reflective plates to radiate the sound efficiently in four horizontal directions. The reflective plates (not used in competitors down-firing subwoofers) negate any effects caused by the floor surface and reduce resonance between sound waves reflected from the floor and the unit. Also, most other systems use circular cones, but by radiating in four directions to avoid the legs of the cabinet, QD-Bass reduces turbulence caused by reflection from the legs. Changing the height of the square pyramid varies the acoustic load, permitting relatively simple
QD-Bass (Quatre Dispersion Bass) technology uses downfiring drivers with square, pyramid-shaped reflective plates to radiate the sound efficiently in four horizontal directions.

Results in Truly

Extra-Long Stroke Driver Construction
High-Strength 25cm (10") Spruce Cone Dust Cap Long Excursion Surround
high-cut adjustment and improved bandpass properties. The QD-Bass system provides extraordinary power and smooth frequency response from an extremely compact unit. It also allows greater freedom of placement, since the sound radiates with equal effectiveness in all directions.
High-Linearity Suspension with Double Spiders Dual-Bias Magnet System
Top Plate 100mm (3/8") Voice Coil Heavy-Duty Aluminum Diecast Frame Yoke Ferrite Magnets
High-Efficiency Power Amplifier and Power Supply
The YST-SW800 and YST-SW320 deliver high power outputs at deep bass levels, with excellent stability and low power consumption, even with their compact cabinets. This is made possible by highly efficient power amplifier technology and, in the YST-SW800, a new power supply. The power amplifier achieves superior conversion efficiency by supplying maximum power (minimizing power loss) from the power transistors according to the output level. It delivers stable power output with high efficiency while minimizing power consumption and heat production. It does not require an output filter coil, resulting in extremely low noise and distortion. High speed transient response is also excellent. The YST-SW800 also uses a new power supply that features superior load characteristics, minimal noise, higher efficiency and greater stability. Switching power supplies, commonly used in audio and other consumer products, are small and efficient, but suffer from noise problems, requiring additional components to solve. This power supply, however, holds the voltage and current levels to zero while

YST-SW800 Rear Panel

the device turns on and off. This reduces noise to 1/30 of conventional switching power supplies. Power loss during switching is also reduced, enabling an incredibly high power conversion efficiency. Other advantages of this power supply include superb stability against power load fluctuations, large capacity, low impedance and silent operation.
are able to handle extremely high input power in a compact unit, with low radial distortion. Additionally, the vertically symmetrical gap magnetic flux density distribution reduces secondary (asymmetrical) distortion. Double spider construction also aids in handling high bass inputs without cone deformation. And the strong diecast frame firmly anchors the entire body including the magnetic circuit, guaranteeing a structure that will not fail under powerful forces.
Advanced Yamaha Active Servo Technology (Advanced YST) is a unique system in which the speaker and amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion. Advanced YST helps to ensure the highest levels of sound pressure and overall performance.
Extra-Long Stroke, Pure Spruce Dual-Bias Drivers
These new drivers provide outstanding power with low distortion and are superior to conventional drivers for a number of reasons. Due to the use of a vertically aligned, dual magnetic circuit structure with 100mm (4") diameter voice coils, they
Space-Saving Voice Coil (Voice Coil: 100mm (4") )

Dual-Bias System

Voice Coil 100mm (4") N S N S Main Magnet N S N S

Conventional System

Voice Coil 100mm (4") Main Magnet N S N S Shielding Magnet
Efficient Power Amplifier and Power Supply
YST-SW800 Extra-Long Stroke
Five Ways to Enjoy the Power and of Yamaha Bass.
Digital Pro Series Subwoofer
This subwoofer is the best that Yamaha has to offer. New design, new technology, and a new dimension of power bass performance. Featuring QD-Bass technology and Advanced YST, it also introduces a new Dual-Bias driver and a new power supply. Experience bass down to 18Hz with up to 1,000W of power: awesome!
Another powerful demonstration of the advantages of QD-Bass technology. The YST-SW320 disperses 250W of pure bass power in four directions from its downfiring drivers. The 25cm (10) driver has an extra-long stroke design for greater stability and durability. Advanced YST adds to the outstanding performance.
Subwoofers Advanced Yamaha Active Servo Technology QD-Bass (Quatre Dispersion Bass) Technology High-Efficiency Power Amplifier High-Efficiency Power Supply Drivers
Magnetic Shielding High Cut Filter (Continuously Variable Control) Phase Control (Normal or Reverse) Auto Standby BASS (Bass Action Selector System) Two Input Connections (Speaker or Line Level) 2-Way Binding-Post Speaker Terminals Output Power Frequency Response Dimensions (W x H x D) Weight

YST-SW800 Yes (Advanced YST) Yes Yes Yes 25cm (10") multi-range, extra-long stroke design with dual-bias system Yes 40140 Hz Yes Yes Yes Yes Yes 1,000 W 18160 Hz (10 dB) 390 x 482 x 420 mm 15-3/8" x 19" x 16-9/16" 24 kg; 52.9 lbs.
YST-SW320 Yes (Advanced YST) Yes Yes 25cm (10") multi-range, extra-long stroke design Yes 40140 Hz Yes Yes Yes Yes Yes 250 W 20160 Hz (10 dB) 340 x 432 x 370 mm 13-3/8" x 17" x 14-9/16" 17 kg; 37.5 lbs.
YST-SW160 Yes (Advanced YST)
YST-SW90 Yes (Advanced YST)
YST-SW45 Yes (Advanced YST)
Dual 20cm (8") multi-range
20cm (8") multi-range
Yes 40140 Hz Yes Yes Yes Yes Yes 150 W 20160 Hz (10 dB) 235 x 602 x 463 mm 9-1/4" x 23-11/16" x 18-1/4" 20 kg; 44.9 lbs.
Yes 50150 Hz Yes Yes Yes Yes 100 W 23170 Hz (10 dB) 235 x 485 x 409 mm 9-1/4" x 19-1/8" x 16-1/8" 14 kg; 30.9 lbs.
Yes 50150 Hz Yes Yes Yes 70 W 30200 Hz (10 dB) 235 x 365 x 318 mm 9-1/4" x 14-3/8" x 12-1/2" 9 kg; 19.8 lbs.

Precision

YST-SW160
Digital Home Theater Subwoofer

YST-SW90

YST-SW45
With dual 20cm (8") drivers, Advanced YST and a 150W high power amplifier, this subwoofer is capable of delivering a powerful punch. Theres a BASS (Bass Action Selection System) mode for automatic adjustment of frequency response, Phase Control, Auto Standby and a High Cut Filter.
An all-discrete 100W high power amplifier and the highly efficient Advanced YST system give this subwoofer exceptional performance capabilities. A Continuously Variable High Cut Filter ensures best matching with room conditions and other speakers. Plus Auto Standby and more in a slim design.
Using the Advanced YST system to deliver deep bass with 70 watts of power from a compact body, the YST-SW45 provides tremendous value. It also offers useful features like Continuously Variable High Cut Filter, Auto Standby and Two-Way Input. A great choice for anyone considering a dual subwoofer system.
Advanced Yamaha Active Servo Technology (Advanced YST) combines the excellent imaging and point source characteristics of small speakers with the superb bass response of large ones. The key to its success is a Helmholtz resonatora small port in the speaker cabinet. The cabinet volume and port size are scaled to an exact ratio, which causes small amplitude input signals to be magnified without distortion. And because zero speaker impedance results in the best reproduction of

deep bass tones, the Advanced YST system includes a negative output impedance amplifier. By precisely matching it to the Helmholtz system, the combined ampspeaker impedance become zero. This enables the compact cabinet to reproduce bass frequencies with close to perfectly flat response. Youre assured of getting the highest levels of sound pressure and overall performance.
To fully optimize bass performance in a highend system, two subwoofers are recommended.

(dB) 70

Conventional speaker Speaker + YST Subwoofer Increased bass reproduction capability

100 20,000 (Hz )

YAMAHA CORPORATION
P.O. Box 1, Hamamatsu, Japan
"d-cinema" is the slogan of Yamaha A/V products and technology, reflecting our focus on digital technology and our leadership in creating and refining digital home theater.
For details please contact:
Visit us at our website: http://www.yamaha.co.jp/

A-1087UEN

10009D Printed in Japan

YST-SW800

SUBWOOFER SYSTEM

SERVICE MANUAL

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. or firm does not constitute authorization, certification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
IMPORTANT: The presentation or sale of this manual to any individual
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.

s CONTENTS

TO SERVICE PERSONNEL. 1 SPECIFICATIONS. 1 REAR PANEL. 2 DISASSEMBLY PROCEDURES. 34 REPAIR PROCEDURES. 56 ADJUSTMENTS. 78 PRINTED CIRCUIT BOARD. 912 BLOCK DIAGRAM. 13 SCHEMATIC DIAGRAM. 1415 PARTS LIST. 1624
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.

100721

s TO SERVICE PERSONNEL
1. Critical Components Information Components having special characteristics are marked Z 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.

WALL OUTLET

EQUIPMENT UNDER TEST
AC LEAKAGE TESTER OR EQUIVALENT

INSULATING TABLE

Meter impedance should be equivalent to 1500 ohm shunted by 0.15F.
Leakage current must not exceed 0.5mA. Be sure to test for leakage with the AC plug in both polarities.
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 before handling food.

s SPECIFICATIONS

Type. Advanced Yamaha Active Servo Technology Driver. 25 cm (9-13/16") cone woofer (JA25610) Magnetically shielded type Amplifier Output U, C models. 1kW A, B, G models. 800W/6 Input Impedance INPUT1 (SP). 4.7k INPUT2 (PJ). 12k Frequency Response. 18 Hz to 160 Hz (-10 dB) Power Supply U, C models. AC120V, 60 Hz A model. AC240V, 50 Hz B, G models. AC230V, 50 Hz Power Consumption. 250W Dimensions (W x H x D). 390 x 482 x 420 mm (15-3/8" x 19" x 16-9/16") Weight. 24 kg (52 lbs. 14 oz) Finish All model. Black color G model. Cherry color Accessories. Nonskid pad x 4

* Specifications subject to change without notice. U C A B G. USA model. Canadian model. Australian model. British model. European model

s REAR PANEL

w U, C models

w A model

w B, G models

s DISASSEMBLY PROCEDURES

(Remove parts in the order as numbered.)
1. Removal of Front Panel Ass'y
Remove 4 screws ( q ) and then remove the Front Panel Ass'y in Fig. 1. * Use an Allen wrench (3mm) to unscrew the Front Panel Ass'y.
3. Removal of Rear Panel Ass'y
Remove 16 screws ( r ) in Fig. 3.
* Arrow marks ( removed. ) are printed to identify the screws to be

Rear Panel Ass'y

Front Panel Ass'y

Main (5) P.C.B.

r Fig. 3

Fig. 1

2. Removal of Loud Speaker
a. Remove 8 screws ( w ) and then remove the Base Ass'y in Fig. 2. b. Remove 8 screws ( e ) and then remove the Loud Speaker in Fig. 2.
* When assembling the Rear Panel, check to ensure that the gasket is not damaged so as to prevent air leakage from occurring.

w w w w

q Installation of emblem

Base Ass'y

1. Put the emblem into the cabinet at the specified position. 2. Place a piece of cloth/wood on top of the emblem. 3. 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.

Loud Speaker

Fig. 2
q Installation of power switch Rapid cures bond (such as 5 minute epoxy) is required to fix the power switch. As shown in Fig. 4, apply rapid cures bond (such as 5 minute epoxy) to the power switch (the area which contacts the rear panel), insert it in the rear panel and make sure it is fixed. (Inserting the power switch in the rear panel only would not be sufficient for its secure installation.) q Precaution for installation of power cord After connecting the power cord, be sure to apply the rapid cures bond (such as 5 minute epoxy) to the cord stopper as shown in Fig. 4, Bond application diagram (Fig. 4)
Apply rapid cures bond between the switch and rear panel.
Apply rapid cures bond before installing the P.C.B.

Apply rapid cures bond

Glue List
Place Cord stopper Name 5 minute epoxy or 2051(Revertex Finewaters SDN.BHD.) or VYLOK 917DH (National Starch & Chemical (M) SDM.BHD.) Power switch 5 minute epoxy or Diabond 1620B

q Dimensions

8 (5/16") 420 (16-9/16") 390 (15-3/8") 22 (7/8")

390 (15-3/8")

482 (19")

Units : mm (inch)

s REPAIR PROCEDURES
It is recommended to disconnect the SW power supply section and the power amplifier because it is highly possible that the SW power supply section has also broken down due to the overload caused by breakdown in the power amplifier. Repair Procedure 1) Remove CB201, CB202 and CB205. (Power (1) P.C.B.) Then the power supply circuit and the power amplifier circuit will be disconnected. 2) Repair the power amplifier as described below. (Main (1) P.C.B.) Replace the defective parts. Whether the major parts are defective or not can be checked as follows. Remove 3 screws fixing the heat sink to the rear panel and 4 screws fixing the support P.C.B. to the rear panel. FET (Q16~19, Q22~24): Measure the resistance value between GATE and SOURCE to determine whether a failure exists or not. If the measured resistance value is close to 0, a failure exists. If the measured resistance value is close to the value of the resistor connected between GATE and SOURCE, no failure exists. Remove 3 screws fixing the Main (1) P.C.B. to the support P.C.B. TR (Q1~4): Check DIODE characteristics between BASE and EMITTER or between BASE and COLLECTOR to determine whether a failure exists or not.
Check the operation as follows. a. Prepare a stabilized DC power source equipped with +30V and -30V outputs. b. Connect +B, -B and GND output terminals of the stabilized power source to +B, -B and GND lines of the power amplifier. c. Connect the terminal of the oscilloscope to the circuit between q in the figure and GND. d. Remove CB1. (Main (2) P.C.B.) e. Connect the output of the signal generator to the circuit between the lead on the (-) side of C1 and GND. f. Set the frequency of the signal generator to the 100Hz sine wave and the output level to the minimum level. g. Turn on the stabilized DC power source. h. Raise the output level of the signal generator gradually and check the output waveform on the oscilloscope. i. If nothing abnormal is found with the waveform until the output level reaches 40Vp-p, the check result is OK. After operation check Connect CB1. 3) Repair the SW power supply section as follows. (Power (1) P.C.B.) Follow the instruction described below to avoid any danger. High voltage maintained in C209 and C210 even after the power is turned off is dangerous. It is necessary to force this electric charge to be discharged before starting the repair work. For such forced discharge, connect a resistance of approximately 100/5W to each of both terminals of the capacitor. Then check to make sure that the voltage between the capacitor terminals is 0V. Replace the defective parts. Whether the major parts are defective or not can be checked as follows. TR (Q202~205): It is highly possible that a failure occurs due to a short between COLLECTOR and EMITTER. R216, R217: It is highly possible that a failure occurs due to an open circuit.

Check the operation and make adjustment as follows. a. Connect CB205. b. Connect the probe of the oscilloscope between TP201 and TP202. c. Turn on the power switch and the STANDBY/ON switch on the front panel. d. Check the waveform on the oscilloscope and adjust VR201 so that a = b is obtained. Permissible range: a/b = 1.0 0.1

280Vp-p

CAUTION Electric potential is always applied to the ground side of the oscilloscope. Be careful so that no other part comes in contact with it.

V : 50V/div AC range

H : 10 sec/div 1 : 1 probe
Caution for operation check of the SW power supply section and the power amplifier As a high voltage is applied to the SW power supply section and the power amplifier, be careful not to receive an electric shock.

Power (1) P.C.B

Main (1) P.C.B

Q18 Q16 Q22 Q24

B GND +B

Main (2) P.C.B

s ADJUSTMENTS
q 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 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 input terminal of YST-SW800. 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 YST-SW800 to the minimum position. 3) Turn on the power to YST-SW800. 4) Adjust the output level of the signal generator and the volume of YST-SW800 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
Point A V : 50V/div DC range (Cathode of D27) H : 2 msec/div 1 : 1 probe Abnormal +B or GND level Becomes constant
q 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 50mV to 250mV.
q 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 10k resistor at both ends of R162 on the MAIN (2) P.C.B. 3) Connect the output signal from the signal generator to the L/MONO terminal of YST-SW800. 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.

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.
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 10k resistor connected to both ends of R162.
Point B V : 50V/div DC range
(Anode of D24) H : 2 msec/div 1 : 1 probe
Abnormal -B or GND level Becomes constant

q Schematic Diagram

IDLING CURRENT ADJ.

DC 50mV to 250mV

q Test Points

Point A Point B

MAIN ( 1 ) P. C. B.

FROM : MAIN (2)

Q17 Q23 Q25 Q39 Q24 Q22 Q16 Q18

TO : POWER (1)

B1 E +B1

RE BL RE

s PRINTED CIRCUIT BOARD (Foil side)

DR+ OUT DR AYST +V1

TO : SPEAKER
B IDLING CURRENT ADJ. IDLING TEST POINT DC 50mV to 250mV A

12 +12

TO : POWER (1) FROM : MAIN (5)

MAIN ( 2 ) P. C. B.

#2 W2 #12

FROM : MAIN (4)

MA1 E TOVL +LIM MA2 TVOL E MAIN +V2 +PWS VCC SWL SWH2 SWH1 SO VCC +V1 E

TO : MAIN (1)

+12 12

+B1 E B1

W10 #10

#11 W11

MAIN ( 4 ) P. C. B.

#1 #4 W1 W4

MA2 LIM 12 +12 TOVL E MA1

TO : MAIN (3)

TO : MAIN (2)

SWL SWH2 SWH1 SO

B, G only

AUTO STANDBY

INPUT 2

OUTPUT INPUT 1

MAIN ( 5 ) P. C. B.
VCC PWS 12 +12 +V2 MAIN E TOVL

POWER ( 2 ) P. C. B.

STANDBY/ ON

HIGH CUT

VOLUME

POWER ( 1 ) P. C. B.

FROM : MAIN (1)

RE RE BE BE BL BL

J, U, C only

A, B, G only

TO : POWER (2)

FROM : POWER CORD

Point C V : 50V/div DC range
(Pin 1 of CB201) H : 10 sec/div 1 : 1 probe
Point D V : 10V/div DC range
(Pin 1 of CB202) H : 10 sec/div 1 : 1 probe

See page 14

REGULATOR
VR3 VOLUME PRE DRIVE Q512 POWER DRIVE Q39, 3A/C Q1619 Q1C, 2C, 4A Q20, 22, 24, 40 RY+ L.P.F. 12dB/oct BASS SELECT SW4 L.P.F. 12dB/oct B H.P.F. 12dB/oct Q1A, 2A, 4C Q15, 21, 23, 25 IC6B + IC7B 4 + 2 IC7A + 8 B.P.F Q3336 IC6A 2 SW2 PHASE SELECT 3

INPUT 1

SPEAKER

L.P.F. 6dB/oct

s BLOCK DIAGRAM
HIGH CUT VR2 IC1, 2 Q32 D32, 33, 35

A.N.I.C 0.1

LIMITER Q2831 DPWR 4 R7 TIMER ICD36

OUTPUT

IC3 Q26, 27

PROTECTION

Q41 +B D47
MUSIC SENSOR IC4 C84 POWER SUPPLY

SWITCHING POWER SUPPLY

R AUTO POWER ON/OFF CIRCUIT

AUTO STANDBY SW3 H/L

OFF +12 IC8

POWER SUPPLY D50

RY201 Q202207 D201, 202 D205209

POWER SW201 L201 F201

SUB POWER SUPPLY D203 REGULATOR PWR D43 D40 STANDBY/ON SW1 IC202

See page 15

D39 Q37

s SCHEMATIC DIAGRAM

B.P.F.
11.8 11.8 -4.4.8.5 8.6 7.9

L.P.F.

PRE DRIVE

POWER DRIVE

6.5.5 5.5 5.1 5.1 4.7 2.3 2.9 3.4 2.9 2.3 0.1 2.9 -2.6 2.3 2.0.1 0.1 0.0 4.4.7 5.1 4.7 4.110 4.7 4.7 4.7 4.111 4.7
0.0.-12.11.0 3.4 3.110 6.0

4.7 4.7

SAME PAGE

LIMITER

0 0.-0.1 0

0.7 0.2

-111 -111
-2.1 -2.7 -0.-4.3 -2.0 -4.3 -4.3 -4.3 -111 -5.2 -112 -111 -112 -111 -111 -110 -110 -111 -111 -110 -111 -5.8 -4.9 -110 -110 -110 -111 -110 -111 -5.2 -4.9 -4.9 -4.3 -4.3 -4.3 -4.3 -111 -4.3 -4.-4.3 0.1
-12.0 -0.0.-1.8 0.-111 -3.4 -3.2 11.8 -2.7 -2.7 -2.1

0.1 3.1 2.1 0.8 2.0

H.P.F.

11.0 0

A.N.I.C
0 5.9 11.6.-12.0 -0.3 -0.-12.11.8 -0.3 -1.6.6 11.8 0.8 6.0
Point A V : 50V/div DC range
(Cathode of D27) H : 2 msec/div 1 : 1 probe
IC1, 2, 4, 6, 7 : PC4570HA Dual OP-Amp

11.8 -12.112

4 VO1 Vm1 +Vm1

8 +Vm2 Vm2 VO2

AUTO POWER ON/OFF CIRCUIT

1.4 6.5 7.8 5.2 7.7 7.7

-111 -1.5 -0.8

POWER SUPPLY

-1.5 0
IC11 : NJM4558L Dual OP-Amp
CIRCUIT CHANGES BY MARKET.

-15.3 0

P15 I-2

6.9 7.3.9 0

X : NOT USED

P15 I-4

P15 I-5

IC5 : M51848L CR Timer

IC3 : PC1237HA Protector IC for Power Amplifier

8 Relay drive circuit

FLIPFLOP
1 Overload detect Mid-point potential detect Flip flop circuit AC OFF detect Vcc on mute

SAME PAGE D-3

REFERENCE VOLTAGE

THRESHOLD

DISCHARGE

TRIGGER

PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.
1SS133 S2L20U EL02Z 1SR139-400 MTZJ2.0B MTZJ12.0B MTZJ24.0B

Cathode

+ 4 5
Latch / automatic return select 4

FMU-12R FMU-34R

FMU-12S FMU-34S
1:Cathode 2:Anode 3:Cathode
1:Anode 2:Cathode 3:Anode
2SA970 (GR, BL) 2SA1015 (O, Y) 2SA1689 (E, F) 2SC1815 (Y, GR) 2SC2240 (GR, BL) 2SC4449 (E, F) 2SC2878 (A, B)

2SC1846S

2SA1837 2SC4793

2SK304 (E)

2SK237B 2SJ406

NJM78M12FA

NJM79M12FA
NJM4558L PC1237HA M51848L

PC4570HA

1: OUTPUT 2: COMMON 32 3: INPUT
1:COMMON 2:INPUT 3:OUTPUT
* All voltage are measured with a 10M/V DC electric volt meter. * Components having special characteristics are marked Z and must be replaced with parts having specifications equal to those originally installed. * Schematic diagram is subject to change without notice.

11.9 0

P14 D-6

AC 12.8V

0 12.1 1.2 1.2 0.7 6.0 0
-0.5 10.2 -0.5 10.2 -18.1 10.2 9.3 9.4 9.4 0.4
0.4 -0.5 -0.5 9.3 9.3 8.8 -1.5 -0.5 8.8 -0.6 -1.3 -1.4 -1.4 -1.3 -1.4 8.8 -1.3 -1.3 0.1 -1.5 -1.5

P14 I-6 P14 H-6

X : NOT USED O : USED

1SS133 1SR139-400

S1NB20

RBV-606

TM1661S-L
2SC2240 (GR, BL) 2SD400 (F)

2SC4163

2SC4140

NJM78L08A

T1 T1 T2 G
1:OUTPUT 2:COMMON 3 3:INPUT

PARTS LIST

s ELECTRICAL PARTS
s WARNING Components having special characteristics are marked Z and must be replaced with parts having specifications equal to those originally installed.
q Carbon resistors (1/6W or 1/4W) are not included in the ELECTRICAL PARTS
List. For the part Nos. of the carbon resistors refer to the last page.
ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS :
C.A.EL.CHP C.CE C.CE.ARRAY C.CE.CHP C.CE.ML C.CE.M.CHP C.CE.SAFTY C.CE.TUBLR C.CE.SMI C.EL C.MICA C.ML.FLM C.MP C.MYLAR C.MYLAR.ML C.PAPER C.PLS C.POL C.POLY C.PP C.TNTL C.TNTL.CHP C.TRIM CN CN.BS.PIN CN.CANNON CN.DIN CN.FLAT CN.POST COIL.MX.AM COIL.AT.FM COIL.DT.FM COIL.MX.FM COIL.OUTPT DIOD.ARRAY DIODE.BRG DIODE.CHP DIODE.VAR DIOD.Z.CHP DIODE.ZENR DSCR.CE FER.BEAD FER.CORE FET.CHP FL.DSPLY FLTR.CE FLTR.COMB FLTR.LC.RF GND.MTL GND.TERM HOLDER.FUS IC.PRTCT JUMPER.CN JUMPER.TST L.DTCT : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : CHIP ALUMI. ELECTROLYTIC CAP CERAMIC CAP CERAMIC CAP ARRAY CHIP CERAMIC CAP MULTILAYER CERAMIC CAP CHIP MULTILAYER CERAMIC CAP RECOGNIZED CERAMIC CAP CERAMIC TUBULAR CAP SEMI CONDUCTIVE CERAMIC CAP ELECTROLYTIC CAP MICA CAP MULTILAYER FILM CAP METALLIZED PAPER CAP MYLAR FILM CAP MULTILAYER MYLAR FILM CAP PAPER CAPACITOR POLYSTYRENE FILM CAP POLYESTER FILM CAP POLYETHYLENE FILM CAP POLYPROPYLENE FILM CAP TANTALUM CAP CHIP TANTALUM CAP TRIMMER CAP CONNECTOR CONNECTOR, BASE PIN CONNECTOR, CANNON CONNECTOR, DIN CONNECTOR, FLAT CABLE CONNECTOR, BASE POST COIL, AM MIX COIL, FM ANTENNA COIL, FM DETECT COIL, FM MIX OUTPUT COIL DIODE ARRAY DIODE BRIDGE CHIP DIODE VARACTOR DIODE CHIP ZENER DIODE ZENER DIODE CERAMIC DISCRIMINATOR FERRITE BEADS FERRITE CORE CHIP FET FLUORESCENT DISPLAY CERAMIC FILTER COMB FILTER MODULE LC FILTER ,EMI GROUND PLATE GROUND TERMINAL FUSE HOLDER IC PROTECTOR JUMPER CONNECTOR JUMPER, TEST POINT LIGHT DETECTING MODULE L.EMIT LED.DSPLY LED.INFRD MODUL.RF PHOT.CPL PHOT.INTR PHOT.RFLCT PIN.TEST PLST.RIVET R.ARRAY R.CAR R.CAR.CHP R.CAR.FP R.FUS R.MTL.CHP R.MTL.FLM R.MTL.OXD R.MTL.PLAT RSNR.CE RSNR.CRYS R.TW.CEM R.WW SCR.BND.HD SCR.BW.HD SCR.CUP SCR.TERM SCR.TR SUPRT.PCB SURG.PRTCT SW.TACT SW.LEAF SW.LEVER SW.MICRO SW.PUSH SW.RT.ENC SW.RT.MTR SW.RT SW.SLIDE TERM.SP TERM.WRAP THRMST.CHP TR.CHP TR.DGT TR.DGT.CHP TRANS TRANS.PULS TRANS.PWR TUNER.AM TUNER.FM TUNER.PK VR VR.MTR VR.SW VR.SLIDE VR.TRIM : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : LIGHT EMITTING MODULE LED DISPLAY LED, INFRARED MODULATOR, RF PHOTO COUPLER PHOTO INTERRUPTER PHOTO REFLECTOR PIN, TEST POINT PLASTIC RIVET RESISTOR ARRAY CARBON RESISTOR CHIP RESISTOR FLAME PROOF CARBON RESISTOR FUSABLE RESISTOR CHIP METAL FILM RESISTOR METAL FILM RESISTOR METAL OXIDE FILM RESISTOR METAL PLATE RESISTOR CERAMIC RESONATOR CRYSTAL RESONATOR TWIN CEMENT FIXED RESISTOR WIRE WOUND RESISTOR BIND HEAD B-TITE SCREW BW HEAD TAPPING SCREW CUP TITE SCREW SCREW TERMINAL SCREW, TRANSISTOR SUPPORT, P.C.B. SURGE PROTECTOR TACT SWITCH LEAF SWITCH LEVER SWITCH MICRO SWITCH PUSH SWITCH ROTARY ENCODER ROTARY SWITCH WITH MOTOR ROTARY SWITCH SLIDE SWITCH SPEAKER TERMINAL WRAPPING TERMINAL CHIP THERMISTOR CHIP TRANSISTOR DIGITAL TRANSISTOR CHIP DIGITAL TRANSISTOR TRANSFORMER PULSE TRANSFORMER POWER TRANSFORMER ASSy TUNER PACK, AM TUNER PACK, FM FRONT-END TUNER PACK ROTARY POTENTIOMETER POTENTIOMETER WITH MOTOR POTENTIOMETER WITH ROTARY SW SLIDE POTENTIOMETER TRIMMER POTENTIOMETER

Note) Those parts marked with # are not included in the P.C.B. ass'y.

P.C.B. MAIN

Schm Ref. PART NO. Schm Ref. PART NO.

Description

* New Parts

Z Z Z Z

P.C.B. MAIN & POWER

P.C.B. POWER

Z Z Z Z Z Z

s EXPLODED VIEW

5-15 5-31
5-11 5-16 5-20 5-23 5-17 5-2 (1)

31 5-37

5-33 5-33 5-37
5-35 5-31 5-1-1 5-34 5-31 5-1-1 (2) 5-34 5-8 5-1-1 (1) 5-1-11 5-24 5-31 5-17 5-21 5-28 5-34 (3) 5-2 (2) 5-17 5-14 5-31 31

5-31 5-6

5-22 4-15 5-1-6 5-1-12 1-8 5-1-1 (4) 5-34 1-7
5-1-12 5-1-7 5-1-5 5-1-5-31

5-1-4 1-12 4-15 1-11

1-12 4-6 5-9 4-7 4-5 4-8 11-12-1-12 1-12 1-12 1-12 27

12-27 12-35

12-11-10 12-10 12-10 12-10 12-1

11-10 11-2 11-35

s MECHANICAL PARTS

Ref. No.

PART NO.

Remarks

Markets
Parts List for Carbon Resistors
Value 1.0 1.8 2.2 3.3 4.7 5.910 1.0 k 1.2 k 1.5 k 1.8 k 2.0 k 2.2 k 2.4 k 2.7 k 3.0 k 3.3 k 3.6 k 3.9 k 4.7 k 5.1 k 5.6 k 6.8 k 8.2 k 9.1 k 1/4W Type Part No. 1/6W Type Part No. HJHFHJHJHFHJHFHJHFHJHFHFHFHJHFHFHFHJHFHFHFHJHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHJHFHFHFHFHFHJHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHJHFHFHFHJHFHFHFHFHFHFHFHJHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFValue 10 k 11 k 12 k 13 k 15 k 18 k 22 k 24 k 27 k 30 k 33 k 36 k 39 k 47 k 51 k 56 k 62 k 68 k 82 k 91 k 100 k 110 k 120 k 150 k 180 k 220 k 270 k 300 k 330 k 390 k 470 k 560 k 680 k 820 k 1.0 M 1.2 M 1.5 M 1.8 M 2.2 M 3.3 M 3.9 M 4.7 M 1/4W Type Part No. 1/6W Type Part No. HFHFHFHFHFHJHFHFHFHFHFHFHFHFHFHFHFHJHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHFHJHFHFHFHFHFHFHFHJHFHFHFHJHFHJHFHJHFHFHJHFHJHFHJHFHJHFHJHJHFHJ35 9470

1/4W Type

1/6W Type

10mm 5mm