Sony SA-WMS21, SS-MS21 Service Manual

SERVICE MANUAL

US Model

Canadian Model

Singapore Model

ACTIVE SPEAKER SYSTEM

SA-F21

SPECIFICATIONS

SA-WMS21 SS-MS21

AUDIO POWER SPECIFICATIONS: (US model only)

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 4 ohm loads, both channels driven, from 40–
20000 Hz; rated 12 watts per channel minimum
RMS power, with no more than 1 % total
harmonic distortion from 200 milli watts to rated
output.

Satellite speakers (SS-MS21)

Speaker system Full range, antimagnetic

speaker

Speaker unit 8 cm (3

1

/

4

in.), cone type
Enclosure type Bass reflex
Rated impedance 4 ohms
Power handling capacity
Maximum input power

30 W
Sensitivity level 79 dB (1 W, 1 m)
Frequency range

150 to 20,000 Hz
Dimensions (approx.)

90 × 200 × 64 mm (3

5

/

8

×

7

7

/

8

× 2

5

/8 in.) (w/h/d)

including projecting parts
Mass (approx.) 630 g (1 lb. 6 oz.)/piece

Subwoofer system (SA-WMS21)

Speaker system Active subwoofer,

antimagnetic

Speaker unit 13 cm (5

1

/

8

in.), cone type

woofer, dual voice coil
Enclosure type Bass reflex
Reproduction frequency range

40 to 150 Hz

Power Output

Satellite speaker 15 W × 2
Subwoofer 15 W + 15 W

Input jack

INPUT Pin jack

Output jack

SPEAKER IMP 4Ω Speaker jack
HEADPHONES Stereo mini jack

General

Power requirements

120 V AC, 60 Hz (US, Canadian models)

Power consumption

60 W (Singapore model)

55 W (US, Canadian models)

220 – 230 V AC, 50/60 Hz (Singapore model)

Dimensions (approx.)

190 × 266 × 375 mm (7

1

/

2

×

10

1

/

2

× 14

7

/8 in.) (w/h/d)

including projecting parts
Mass (approx.) 7.0 kg (15 lb. 7 oz.)

Design and specifications are subject to change
without notice.

– 2 –

WARNING!!

WHEN SERVICING, DO NO T APPR O A CH THE LASER
EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS
NECESSARY TO CONFIRM LASER BEAM EMISSION,
BE SURE TO OBSERVE FROM A DISTANCE OF
MORE THAN 25 cm FROM THE SURFACE OF THE
OBJECTIVE LENS ON THE OPTICAL PICK-UP BLOCK.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMA TIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

Fig. A. Using an AC voltmeter to check AC leakage.

1.5 k

Ω

0.15 µF

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester , such as the Simpson 229 or RCA

WT -540A. Follow the manufacturers' instructions to use these

instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indica-

tion is 0.75V, so analog meters must have an accurate low-

voltage scale. The Simpson 250 and Sanwa SH-63T rd are ex-

amples of a passive VOM that is suitable. Nearly all battery

operated digital multimeters that have a 2V A C range are suit-

able. (See Fig. A)

1. Check the area of your repair for unsoldered or poorly-sol­dered connections. Check the entire board surface for solder
splashes and bridges.

2. Check the interboard wiring to ensure that no wires are
“pinched” or contact high-wattage resistors.

3. Look for unauthorized replacement parts, particularly transis­tors, that were installed during a previous repair. Point them
out to the customer and recommend their replacement.

4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and recom­mend their replacement.

5. Check the line cord for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.

6. Check the B+ voltage to see it is at the values specified.

7. Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:

– 3 –

1. GENERAL............................................................ 1-1

2. BLOCK DIAGRAMS

2-1. Overall Block Diagram .................................................. 2-1

2-2. Audio/control Block Diagram ........................................ 2-3

2-3. Power Block Diagram .................................................... 2-5

3. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS

3-1. Circuit Boards Location ................................................. 3-2

3-2. Frame Schematic Diagram ........................................... 3-3

3-3. Printed Wiring Boards and Schematic Diagrams ......... 3-5

Main, Jack, Sub Transformer

Printed Wiring Boards ................................................... 3-5

Main, Jack, Sub Transformer

Schematic Diagram ....................................................... 3-7

Control Printed Wiring Board ........................................ 3-9

Control Schematic Diagram .......................................... 3-11

Power, Speaker Terminal Printed Wiring Boards .......... 3-14

Power, Speaker Terminal Schematic Diagram.............. 3-15

4. REPAIR PARTS LIST

4-1. Exploded Views ............................................................. 4-1

4-1-1. SA-WMS21............................................................... 4-1

4-1-2. SS-MS21 .................................................................. 4-2

4-2. Electrical Parts List........................................................ 4-3

TABLE OF CONTENTS

Section Title Page

SA-F21

1-1 1-2 E

SECTION 1

GENERAL

This section is extracted from in­struction manual (3-071-506-11).

English

Warning

To prevent fire or shock hazard, do not expose
the unit to rain or moisture.

This symbol is intended to alert the user
to the presence of uninsulated
“dangerous voltage” within the
product’s enclosure that may be of
sufficient magnitude to constitute a risk
of electric shock to persons.

This symbol is intended to alert the user
to the presence of important operating
and maintenance (servicing) instructions
in the literature accompanying the
appliance.

For customers in the U.S.A.

Owner’s Record

The model and serial numbers are located at the rear of
the unit. Record the serial number in the space provided
below. Refer to them whenever you call upon your Sony
dealer regarding this product.

Model No. SA-F21
Serial No.______________

NOTE:

This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference in a residential installation. This equipment
generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. However, there is no guarantee that
interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio
or television reception, which can be determined by
turning the equipment off and on, the user is
encouraged to try to correct the interference by one or
more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and

receiver.

– Connect the equipment into an outlet on a circuit

different from that to which the receiver is connected.

– Consult the dealer or an experienced radio/TV

technician for help.

CAUTION

You are cautioned that any changes or modifications not
expressly approved in this manual could void your
authority to operate this equipment.

For customers in Canada

CAUTION

TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS
POLARIZED AC PLUG WITH AN EXTENSION CORD,
RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT
BLADE EXPOSURE.

Precautions

On safety

Should any solid object or liquid fall into the cabinet,
unplug the speaker system and have it checked by
qualified personnel before operating it any further.

On power sources

•AC power cord must be changed only at the qualified
service shop.

•Before operating the speakers, check that the operating
voltage is identical with your local power supply. The
operating voltage is indicated on the nameplate on the
rear of the speakers.

•The unit is not disconnected from the AC power
source as long as it is connected to the wall outlet, even
if the unit itself has been turned off.

•If you are not going to use the speakers for a long time,
be sure to disconnect the speakers from the wall outlet.
To disconnect the AC power cord, grasp the plug itself;
never pull the cord.

On placement

•Do not install the appliance in a confined space, such
as a bookcase or built-in cabinet.

•Do not place the speakers near heat sources, or in a
place subject to direct sunlight, excessive dust or
mechanical shock.

•Good ventilation is essential to prevent internal heat
buildup. Place the speakers in a location with adequate
air circulation, and in a way that does not block the
rear ventilation holes.

On operation

•When turning on or off the subwoofer or other
equipment, lower the volume of the subwoofer to
minimum.

•To avoid damaging the subwoofer:
– Be careful in setting the volume control of the

subwoofer to avoid an excessive input power.

– Do not open the enclosure or remold speaker units

and networks.

– The grill net is not removable. Do not remove it.

On the speaker system

Although this speaker system is magnetically shielded,
there may be cases where the picture on some TV sets
becomes magnetically distorted. In such a case, turn off
the power of the TV set once, and after 15 to 30 minutes
turn it on again.
If there seems to be no improvement, locate the
speaker system further away from the TV set. Also, be
sure not to place objects in which magnets are attached
or used near the speaker system, such as audio racks, TV
stands, and toys. These may cause magnetic distortion to
the picture due to their interaction with the system.

On cleaning

Clean the cabinet, panel and controls with a soft cloth
slightly moistened with a mild detergent solution. Do
not use any type of abrasive pad, scouring powder or
solvent such as alcohol or benzine.

If you have any question or problem concerning your
speaker system, please consult your nearest Sony dealer.

Setting Up

Step 1: Unpacking

Check that you have the following items:

•Audio cord (with red and white plugs) (1)

•Speaker cords (2.5 m) (2)

•Speaker stands (2)

•Stand screws (8)

•Washers for stand screws (8)

Step 2: Connecting Speakers

Before you start, turn off the power and
disconnect the power cord of each

component.
Refer to the instructions supplied with the
components to be connected.

Connecting to the DVP-F21 (fig. A)

1 Connect the player to the TV.

Use a video cord (not supplied). First remove the
jack cover from the player, and then connect the
VIDEO OUT jack of the player with the video
input jack of the TV.
You can use the video/audio cord with red,
white and yellow plugs supplied with DVP-F21
instead of the video cord (not supplied). Connect
the yellow plug only.

If you connect a TV with S VIDEO input jack, use
an S VIDEO cord (not supplied). You will enjoy
high quality images.

2 Connect the player to the subwoofer.

Use the supplied audio cord (with red and white
plugs). Connect the AUDIO OUT L/R jacks of the
player to the INPUT L/R jacks of the subwoofer.
Connect the red plug to the red jack and white
plug to the white jack.

3 Connect the satellite speakers to the

subwoofer.

Use the supplied speaker cords. Connect the cord
with stripe to the # terminal.

Attach the jack cover to the player.
You can install the player in three ways;
horizontal, vertical or on the wall.
See “Step 3: Attaching the Jack Cover” in the
operating instructions supplied with the player.

Notes

•Plug cords securely to prevent unwanted noise. (fig.

A-1)

•Be sure to match the speaker cord to the appropriate
terminal: + to + and – to –. If the cords are reversed,
the sound will be distorted and will lack bass. (fig. A-

2)

Connecting to a component other than
the

DVP-F21

Connect the SA-F21 in the same way as the DVP­F21. Connect the audio output L/R (front L/R)
jacks of your player to the INPUT L/R jacks of
the subwoofer in step 2.

Step 3: Installing Speakers

For greater flexibility in the positioning of the
satellite speakers, use the supplied speaker
stands. (fig. B)
Speaker stands WS-FV10A, WS-TV10A, and WS­WV10A are also available on option.

You can install the satellite speakers on the wall
using commercially available screws. (fig. C)

You need to determine the appropriate hanging
screws and/or other necessary hardware needed
to securely and safely fasten the speakers to the
wall. Please be sure you have selected fasteners
or screws that will fit in the hanging holes on the
rear of the speaker.

Placement of the screws should be at the same
height and should be 2 3/8 in. (59 mm) apart. The
screws or other fasteners should protrude by
3/16 in. to 7/32 in. (4 to 5 mm). You may also
mark placement of the screws or fasteners by use
of something like a template.

Hang the speakers on the screws and push the
speakers so that they fit against the wall.

BC

A

2 3/8 in.
(59 mm)

Screws

#

3

TV

Satellite speakers

Subwoofer

CD/DVD Player DVP-F21

Notes

•When you install the speakers on the wall, make sure
that the wall is strong enough to hang the speakers.

•When you disconnect or connect the cords, take the
speakers down from the wall.

•For best possible surround sound, place the satellite
speakers on both sides of the TV or monitor equal
distances apart.

Step 4: Connecting the Power
Cord

Connect the power cord of each component to the
wall outlet.

Step 5: Setting Up for the CD/
DVD Player

You may need to make some setups for the
player. Refer to the instructions supplied with the
components to be connected.

If you are using the DVP-F21

When connecting to a wide screen TV, the image
may not fit your TV screen depending on the
disc. If you want to change the aspect ratio, select
“SCREEN SETUP” in the Setup Display and then
adjust the “TV TYPE”setting, see “Settings for the
Display (SCREEN SETUP)” in the operating
instructions supplied with the player.

A-1

A-2

1

2

3

3

/16 – 7/

32

in.

(4 – 5 mm)

Insert up to here.

Video cord (not supplied)

Audio cord (supplied)

Speaker cord (supplied)

to AUDIO OUT L to AUDIO OUT R

to VIDEO OUT

Screw hole to attach the stand
such as WS-FV10A, WS-TV10A,
WS-WV10A (not supplied)

3

/16 in.

(4.5 mm)

3

/8 in.

(9 mm)

Playing the Disc (fig . D)

After connecting and setting up the player, you
can play the disc.

1

Turn on the components.
TV:

Turn on the TV and switch the input selector
on the TV to the player.

Player:

Turn on the player.

2

Press ?/1 (power) on the subwoofer.

The subwoofer is turned on and the power
indicator changes from red (standby) to
green.

3

Press MODE on the subwoofer repeatedly
until the MASTER VOL indicator lights up
in green.

4

Press LEVEL – to turn down the volume to
the minimum.

5

Insert the disc in the player.

6

Press H on the player.

Playback starts. Adjust the volume with
LEVEL +/– on the subwoofer.

Using the headphones

Connect the headphones (not supplied) to the
HEADPHONES jack on the subwoofer.
To adjust the volume, press MODE on the
subwoofer repeatedly until the MASTER VOL
indicator lights up. Then press LEVEL +/–.

z The subwoofer automatically enters
standby mode (Auto Power On/Off function)

If no audio signal is input to the subwoofer for about 3
minutes, the subwoofer automatically enters standby
mode and the ?/1 (power) indicator changes to red.
When an audio signal is input, the subwoofer turns on
automatically and the ?/1 indicator changes to green.
The Auto Power On/Off function works only when no
audio signal is input for about 3 minutes. If you want to
turn off the subwoofer at once, press ?/1 (power) on the
subwoofer.

Adjusting the speakers

To select the volume to be adjusted

1

Press MODE repeatedly to turn on the
desired volume indicator (MASTER VOL for
entire volume or SW VOL for subwoofer
volume).

2

Press LEVEL +/– to adjust the volume.

If you are using the DVP-F21

If you set the TV/DVD switch on the remote to
DVD, you can adjust the entire volume with VOL
+/– on the remote.

zSome of the remote that can control Sony AV

amplifiers (receivers) may be able to control the
volume of this system.

To select a range to be adjusted

1

Press MODE repeatedly to turn on the
desired range indicator (BASS for the low
frequency range or TREBLE for the middle to
high frequency range).

2

Press LEVEL +/– to adjust the volume.

To switch the subwoofer mode to match
the bass output of the sound source

Press LEVEL + and – at the same time on the
subwoofer to switch the subwoofer mode
between MOVIE and MUSIC. The color of the SW
VOL indicator will indicate the current mode.
The default setting is MOVIE.

Mode Color For sound sources such as

MOVIE Green Movies
MUSIC Red Music

To return the volume setting to the default
setting

While pressing LEVEL + and – at the same time,
press ?/1 (power) on the subwoofer.

Troubleshooting Guide

If you experience any of the following difficulties
while using the system, use this troubleshooting
guide to help remedy the problem before
requesting repairs. Should any problem persist,
consult your nearest Sony dealer.

The subwoofer automatically entered
standby mode.

, Auto Power On/Off function worked because

no audio signal had been input for about 3
minutes.

There is no sound from the speakers.

, The system is not connected correctly.
, The system is connected by incorrect

connecting cords.

, The volume is turned down to the minimum.
, The headphones are connected.

Sound is noisy.

, The system is not connected correctly.
, Audio equipment or such is placed close to an

equipment causing noise such as TV.

, The plugs and jacks are dirty.

Sound stops suddenly.

, The system is not connected correctly.
, Short-circuit occurred to the stripped speaker

cord.

D

1
2
3
4
5
6
7

8

Parts and controls

1 ?/1 (power) button/indicator
2 MODE (mode) button
3 MASTER VOL (master volume) indicator
4 SW VOL (subwoofer volume) indicator
5 BASS (bass) indicator
6 TREBLE (treble) indicator
7 LEVEL (level) +/– buttons
8 HEADPHONES (headphones) jack

SA-F21

2-1 2-2

SECTION 2

BLOCK DIAGRAMS

2-1. OVERALL BLOCK DIAGRAM

IC107

IC103

IC109IC101

VOLUME,

TONE

CONTROL

IC104

IC102

HPF

IC301

POWER

AMP

IC601

HEADPHONE

AMP

+

+

IC105 (1/2)

IC105 (2/2)

SOUND

CONTROL

HPF

IC106 (2/2)

LPF

IC106 (1/2)

LIMITER

AMP

MUTE
DRIVE

L

R

INPUT

PJ101

MAIN BOARD

(SEE PAGE 3-7)

JACK BOARD

(SEE PAGE 3-8)

POWER BOARD

(SEE PAGE 3-15)

CONTROL BOARD

(SEE PAGE 3-11)

SPEAKER TERMINAL BOARD

(SEE PAGE 3-16)

SUB TRANSFORMER BOARD

(SEE PAGE 3-7)

AC IN

D810 – 813

D801

T802

T801

+VCC

RY801

HEADPHONES

J601

RY301

+
+

L

R

–

–

SPEAKER

IMP 4Ω

RELAY

CONTROL

IC401

POWER

AMP

RY401

SP101

SUB WOOFER

IC501

IC802

IC502

SYSTEM

CONTROL

REG

+11V

+5V

–11V

+VSS

–VSS

AUTO POWER

DETECT

+5V REG

IC504

MUTE

SW DATA, SW CLK

VOL CLK,
VOL DATA, VOL CE

SW DATA, SW CLK

AUTO SW

STANDBY

VOL CLK, VOL DATA,

VOL CE

+VCC

FUNCTION

SWITCH

S501 – 504

LED

D502 – 511

RESET

+5V

05

L-CH

R-CH

SS-MS21

SA-F21

2-3 2-4

2-2. AUDIO/CONTROL BLOCK DIAGRAM

IC106

LIMITER AMP,

LPF

IC102

HPF

3 1

5 7

IC107

LINE AMP

IC105 (1/2)

MIX AMP

IC105 (2/2)

HPF

31 24

2 9

20

IC101

VOLUME,

TONE

CONTROL

IC104

SOUND

CONTROL

3 1

5 7

IC109

AMP

2

6

IC601

HEADPHONE AMP

3 1

5 7

19
18

14

Q601
MUTE

Q602
MUTE

3

4

2

5

1

3

4

2

5

1

HEADPHONES

J601

JACK BOARD

(SEE PAGE 3-8)

POWER BOARD

(SEE PAGE 3-15)

CONTROL BOARD

(SEE PAGE 3-11)

MAIN BOARD

(SEE PAGE 3-7)

SPEAKER TERMINAL BOARD

(SEE PAGE 3-16)

2 1

6 7

IC103

MIX AMP

+

21

19

20

4 5 7 2 1

5 7

Q603
MUTE

Q604
MUTE

B+

+

Q605
MUTE

DRIVE

3
4
5

1

3
4
5

1

Q101, 102

MUTE
DRIVE

Q806

POWER ON

MUTING

D809

1

2

1

2

6

8

4

3

1

INL

RIN

M/S

OUTL

OUTR

IC301

POWER AMP

6

8

4

3

1

IN1

RI2

M/S

OUT1

OUT2

IC401

POWER AMP

IC502

AUTO POWER DETECT

IC501

SYSTEM CONTROL

IC504

RESET SIGNAL

GENERATOR

IC503

REMOTE COMMANDER

RECEIVER

2

3

4

5

1

2

3

4

5

1

+

+

–
–

POWER

(SEE PAGE 2-5)

POWER

(SEE PAGE 2-5)

3

2

4

1

SP101

SUB WOOFER

RY401

RY301

L

R

L

R

INPUT

Q301, 303, 305

RELAY

CONTROL

PJ101

IN2

IN1

OUT2

OUT1

CLK

DATA

LATCH

MUTE

IN OUT

SCK

SI

CN101 CN601

CN103 CN303

CN305CN301

TH305

CN304

CN808

CN305

HP L

GND

HP R

MUTE
MUTE

L CH

R CH

SW

MUTE/STBY

VOL CLK

VOL DATA

VOL CE

SW DATA

SW CLK

AUTO POWER

DETECT

STANDBY

5

25

36
34
35

37
38
39

22

3

2

6

7

1

OUTPUT 1

OUTPUT 2

INPUT

RELAY

CONTROL

Q501

LED

DRIVE

Q503

LED

DRIVE

Q504

I/1

D502

30

LED

DRIVE

Q505

LED

DRIVE

Q506

SW VOL

D503

3

1

28

RESET

VOL_CLK
VOL_DATA
VOL_CE

SW_DATA
SW_LATCH
SW_CLK

AUTO SW

LED OPR

LED STBY

MUSIC

MOVIE

31

10

11

13

14

4

OUT

+5V

+5V

I/1

S501

MODE

LEVEL

S502

MASTER VOL

D511

32

BASS

D510

33

TREBLE

D509

43

MAX

D508

44

3

D507

45

2

D506

46

1

D505

47

MIN

D504

S503

+

S504

–

X501
6MHz

RIMOKON

LED_VOL

CF1

CF2

KEY1

KEY2

MAIN_SW

LED_BASS

LED_TREBLE

LED_MAX

LED_LEVEL3

LED_LEVEL2

LED_LEVEL1

LED_MIN

3

2

1

7

8

9

10

CN502

2

1

3

10

4

8

9

CN102

05

12

1

7

SPEAKER

IMP 4Ω

L-CH

R-CH

SS-MS21

Q805, 807

RELAY

CONTROL

IC501 q;

4.24 Vp-p

SA-F21

2-5 2-6 E

2-3. POWER BLOCK DIAGRAM

2

1

2

1

T802

SUB
POWER
TRANS

D811 D816 D815 D814

D812

D810

D813

2

1

2

1

CN806 CN805

SUB TRANSFORMER BOARD

(SEE PAGE 3-7)

CONTROL BOARD

(SEE PAGE 3-11)

MAIN BOARD

(SEE PAGE 3-7)

CN804

CN803

T801
MAIN

POWER

TRANS

2

1

CN801

AUDIO/CONTROL

(SEE PAGE 2-3)

Q802
RELAY
DRIVE

RY801 F801

+8V REG

1 3IN OUT

IC104

IC106

D801

LIMITER

AMP,

LPF

MIX,
HPF

SOUND

CONTROL

IC103

MIX

AMP

IC107

LINE
AMP

IC601

IC801

HEADPHONE

AMP

IC501

SYSTEM

CONTROL

IC105

POWER

AMP

IC301

POWER

AMP

IC401

IC101

IC802

IC109

AMP

HPF

VOLUME,

TONE

CONTROL

IC102

3

1

5

3

1

POWER BOARD

(SEE PAGE 3-15)

CN302

1 3IN OUT

+5V REG.

RESET
SIGNAL

GENERATOR

IC504

AUTO
POWER
DETECT

IC502

REMOTE

COMMANDER

RECEIVER

IC503

6

CN102

+VCC

+VSS

–VSS

AC IN

05

AUDIO/CONTROL

(SEE PAGE 2-3)

Q803

+11V REG

Q804

–11V REG

3-1

SA-F21

SECTION 3

PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)

For printed wiring boards:

• X : indicates a lead wire mounted on the component
side.

• x : indicates a lead wire mounted on the printed side.

• b : Pattern from the side which enables seeing.

(The other layers’ patterns are not indicated.)

For schematic diagram:

• Caution when replacing chip parts.
New parts must be attached after removal of chip.
Be careful not to heat the minus side of tantalum capacitor,
because it is damaged by the heat.

• All resistors are in ohms, 1/

4

W (Chip resistors : 1/

10

W) un­less otherwise specified.
kΩ : 1000Ω, MΩ : 1000kΩ.

• All capacitors are in µF unless otherwise noted. pF : µµF
50V or less are not indicated except for electrolytics and
tantalums.

• All variable and adjustable resistors ha ve characteristic curve
B, unless otherwise noted.

• 2 : nonflammable resistor.

• 5 : fusible resistor.

• C : panel designation.

• f : internal component.

• C : adjustment for repair.

• U : B+ Line.

• V : B– Line.

• Circled numbers refer to w aveforms.

• Voltages are dc between measurement point.

• V oltage and wavef orms are dc with respect to ground under
no-signal conditions.

• Readings are taken with a digital multimeter (DC 10MΩ).

• Voltage variations may be noted due to normal production
tolerances.

When indicating parts by reference
number, please include the board
name.

Note:

The components identi­fied by mark 0 or dotted
line with mark 0 are criti­cal for safety.
Replace only with part
number specified.

Note:

Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.

• Abbreviation
CND : Canadian model
SP : Singapore model