Technics SA-310, SA-EX310K, SA-EX310EB, SA-EX310E, SA-EX310EG Service Manual

ORDER NO. MD9707082C2

Receiver

AV Control Stereo Receiver

Colour

(K) . . . . . . . . Black Type

SA-EX310

© 1997 Matsushita Electronics (S) Pte. Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

Area

®

Manufactured under license from Dolby Laboratories Licensing Corporation. Additionally licensed
under one or more of the following patents: U.S. numbers 3,632,886,3,746,792 and 3,959,590;
Canadian numbers 1,004,603 and 1,037,877.
"Dolby" and the double-D symbol are trade marks of Dolby Laboratories Licensing Corporation.

*

Colour

Area

Suffix for
Model No.

(E) Europe

(EB) Great Britain

(EG) Germany and Italy

(K)

SPECIFICATIONS\ ТЕХНИЧЕСКИЕ ХАРАКТЕРИСТИКИ
PROTECTION CIRCUITRY\ СИСТЕМА ЗАЩИТЫ
CAUTION FOR AC MAIN LEADS\ МЕРЫ БЕЗОПАСНОСТИ ПРИ РАБОТЕ СО ШНУРОМ

ПИТАНИЯ ПЕРЕМЕННОГО ТОКА

OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT
PROCEDURES\ПРОВЕРКА РАБОТОСПОСОБНОСТИ И ЗАМЕНА ОСНОВНЫХ

КОМПОНЕНТОВ

FAN MOTOR TROUBLESHOOTING\ НЕИСПРАВНОСТИ ДВИГАТЕЛЯ ОХЛАЖДЕНИЯ
TROUBLESHOOTING\ НЕИСПРАВНОСТИ И МЕТОДЫ ИХ УСТРАНЕНИЯ
BLOCK DIAGRAM\ БЛОК-СХЕМА
TERMINAL FUNCTIONS OF IC's\ ФУНКЦИОНАЛЬНОЕ НАЗНАЧЕНИЕ ВЫВОДОВ

ИНТЕГРАЛЬНЫХ МИКРОСХЕМ

TERMINAL GUIDE OF IC's, TRANSISTORS & DIODES\ ЦОКОЛЕВКА ВЫВОДОВ

ИНТЕГРАЛЬНЫХ МИКРОСХЕМ, ТРАНЗИСТОРОВ И ДИОДОВ

SCHEMATIC DIAGRAMS\ ПРИНЦИПИАЛЬНЫЕ СХЕМЫ
PRINTED CIRCUIT BOARDS\ ПЕЧАТНЫЕ ПЛАТЫ
WIRING CONNECTION DIAGRAM\ СХЕМА СОЕДИНЕНИЯ
CABINET PARTS LOCATION\ РАСПОЛОЖЕНИЕ ЧАСТЕЙ КОРПУСА
REPLACEMENT PARTS LIST\ СПИСОК ЗАПАСНЫХ ЧАСТЕЙ
RESISTORS & CAPACITORS\ РЕЗИСТОРЫ И КОНДЕНСАТОРЫ
PACKAGING\УПАКОВКА

SA-EX310

Protection Circuitry

The protection circuitry may have operated if either of the follow­ing conditions are noticed:

 No sound is heard when the power is turned on.
 Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, for
example, the positive and negative speaker connection wires
are "shorted", or if speaker systems with an impedance less than

the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:

1. Turn off the power.

2. Determine the cause of the problem and correct it.

3. Turn on the power once again after one minute.

Note:

When the protection circuitry functions, the unit will not operate
unless the power is first turned off and then on again.

IF rejection ( at 999 kHz ) 55 dB

Amplifier Section

Power output (at 240 V)

DIN 1 kHz (T.H.D. 1%) 2 X 60 W(4Ω)

40 Hz20 kHz continuous power output

both channels driven 2 X 40 W(8Ω)

Total harmonic distortion

Rated power at 40 Hz  20kHz 0.8 % (8Ω)
Half power at 1 kHz 0.07 % (8Ω)

Power output at the Dolby Pro Logic operation

DIN 1 kHz ( T.H.D. 1 % )
Front 2 X 50 W (4Ω)
Center 50 W (8Ω)
Surround 50 W (8Ω)

Damping factor 30 (8Ω)
Load impedance

Front 4 - 16 Ω
Center 8 - 16 Ω
Surround 4 - 16 Ω

Power bandwidth both channels driven, -3 dB 10 Hz - 40 kHz (8Ω)
Intermodulation distortion rated

power at 60 Hz : 7 kHz = 4:1, SMPTE 0.5 % (8Ω)

Frequency response

PHONO RIAA standard curve(30Hz-15kHz)

+0.8 dB

CD, TAPE, VCR, TV/DVD 10Hz  40kHz,

+3 dB

Input sensitivity and impedance

PHONO 3 mV / 47 kΩ
CD, TAPE, VCR, TV/DVD 200 mV / 22 kΩ

S/N at rated power ( 8Ω )

PHONO 70 dB (IHF, A: 80 dB)
CD, TAPE, VCR, TV/DVD 75 dB (IHF, A: 85 dB)

Tone controls

BASS 50 Hz , +10 to -10 dB
TREBLE 20 kHz, +10 to -10 dB

Output voltage

TAPE REC (OUT), VCR OUT 200 mV

Channel balance (250 Hz - 6.3 kHz)

+ 1 dB

Channel separation 55 dB
Headphones output level and impedance 430 mV / 330 Ω
Subwoofer frequency responce 7 100 Hz,

+ 3 dB

General

Power consumption 160 W
Power supply

E , EG AC 230 V, 50 Hz

EB AC 230 - 240 V, 50 Hz
Dimensions (W x H x D) 430 x 136 x 309 mm
Weight 7.3 kg

Notes :

1. Specifications are subject to change without notice.
Weight and dimensions are approximate.

2. Total harmonic distortion is measured by the digital spectrum

Specifications

FM Tuner Section

Frequency range 87.50  108.00 MHz
Sensitivity

S/N 30 dB 1.5 µV / 75Ω
S/N 26 dB 1.3 µV / 75Ω

S/N 20 dB 1.2 µV / 75Ω
IHF usable sensitivity 1.5 µV / 75Ω (IHF '58)
IHF 46 dB stereo quieting sensitivity 22 µV /

75Ω

Total harmonic distortion

MONO 0.2%

STEREO 0.3%
S/N

MONO 60 dB (75 dB, IHF)

STEREO 58 dB (71 dB, IHF)
Frequency response 20Hz  15 kHz (+1dB, 2dB)
Alternate channel selectivity

+ 400 kHz 65 dB
Capture ratio 1 dB
Image rejection at 98MHz 40 dB
IF rejection at 98MHz 70 dB
Spurious response rejection at 98MHz 70 dB
AM suppression 50 dB
Stereo separation 1kHz 40 dB
Carrier leak

19kHz -30 dB (-35 dB, IHF)

38kHz -50 dB (-55 dB, IHF)

Channel balance (250 Hz - 6.3 kHz )

+1.5 dB

Limitting point 1.2 µV
Bandwidth

IF amplifier 180 kHz
FM demodulator 1000 kHz

Antenna terminal(s) 75Ω (unbalanced)

Video Section

Output voltage at 1V input (unbalanced) 1±0.1 Vp-p
Maximum input voltage 1.5 Vp-p
Input/output impedance 75 Ω (unbalanced)

AM Tuner Section

Frequency range AM

( 9 kHz steps ) 522  1611 kHz

( 10 kHz steps ) 530  1620 kHz
Sensitivty 20 µV, 330 µV / m
Selectivity ( at 999 kHz ) 55 dB
Image rejection ( at 999 kHz ) 40 dB

SA-EX310

(For EB area code model only.)

For your safety, please read the following text carefully.

This appliance is supplied with a moulded three pin mains plug
for your safety and convenience.
A 5-ampere fuse is fitted in this plug.
Should the fuse need to be replaced please ensure that the
replacement fuse has a rating of 5-ampere and that it is approved
by ASTA or BSI to BS1362.

Check for the ASTA mark

A S

A

or the BSI mark on the body

of the fuse.

If the plug contains a removable fuse cover you must ensure that
it is refitted when the fuse is replaced.
If you lose the fuse cover, the plug must not be used until a
replacement cover is obtained.
A replacement fuse cover can be purchased from your local
dealer.

If a new plug is to be fitted, please observe the wiring code as
shown below.
If in any doubt please consult a qualified electrician.

IMPORTANT

The wires in this mains lead are coloured in accordance with the
following code:

Blue: Neutral

Brown: Live
As these colours may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows:
The wire which is coloured Blue must be connected to the terminal
which is marked with the letter N or coloured Black or Blue.

The wire which is coloured Brown must be connected to the
terminal which is marked with the letter L or coloured Brown or
Red.

WARNING: DO NOT CONNECT EITHER WIRE TO
THE EARTH TERMINAL WHICH IS MARKED WITH
THE LETTER E, BY THE EARTH SYMBOL OR
COLOURED GREEN OR GREEN/YELLOW.

THIS PLUG IS NOT WATERPROOFKEEP DRY.

Before use

Remove the connector cover.

How to replace the fuse

The location of the fuse differ according to the type of AC mains
plug (figures A and B). Confirm the AC mains plug fitted and follow
the instructions below.
Illustrations may differ from actual AC mains plug.

1. Open the fuse cover with a screwdriver.

Figure A

Figure B

2. Replace the fuse and close or attach the fuse
cover.

Figure A

Figure B

CAUTION !

IF THE FITTED MOULDED PLUG IS
UNSUITABLE FOR THE SOCKET OUTLET IN
YOUR HOME THEN THE FUSE SHOULD BE
REMOVED AND THE PLUG CUT OFF AND
DISPOSED OFF SAFELY.
THERE IS A DANGER OF SEVERE
ELECTRICAL SHOCK IF THE CUT OFF PLUG
IS INSERTED INTO ANY 13-AMPERE
SOCKET.

Caution for AC Main Leads

Fuse cover

Fuse
(5 ampere)

Fuse
(5 ampere)

SA-EX310

Operation Checks and Main Component Replacement Procedures

"ATTENTION SERVICER" Some chassis components may have sharp edges. Be careful when disassembling and servic-

ing. Please take note that the diagrams shown are for model SA-EX510 which is similar to SA­EX310.

1. This section describes procedures for checking the operation of the major printed circuit boards and
replacing the main components.

2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.

3. Select items from the following index when checks or replacement are required.

 Checking Procedure For Each Major P.C.B ........................................................................................ 4 ~ 6

 Main Component Replacement Procedures ........................................................................................ 6 ~ 8

 Contents

Checking Procedure For Each Major P.C.B.

1. Checking of the Panel P.C.B., and Tuner P.C.B.

a

X

4

a

a

a

b

b

Step 2

X

2

PANEL P.C.B.
(Solder Side)

IN/OUT TERMINAL P.C.B.
(Solder Side)

Step 1

Remove the top cabinet.

TUNER P.C.B.
(Solder Side)

[XTBS3+8JFZ1] (Black)

b

[SNE2129-1] (Black)

a

2. Checking of the In/Out Terminal P.C.B.

b

Step 2

X 14

Step 3

Release the catch, pull

the rear panel in the

direction of arrow 1 and

simultaniously remove the

In/Out Terminal P.C.B. in

the direction of arrow 2

.

1

2

Step 1

Catch

Catch

IN/OUT TERMINAL
P.C.B.

SA-EX310

Step 1

Remove the top cabinet.

c

c

c

c

c

c

c

c

c

c

d

Step 4

Remove the Volume Knob
and Nut.

Step 6

X
18

X 1

Step 7

Step 5

Pull out 3 knobs.

d

[XTBS26+10J]

c

b

b

b

X 3

Step 2

Step 3

Remove the front panel in

the direction of arrow.

Power Switch P.C.B.

Panel P.C.B.

Step 8

Pull out the Headphone

Jack P.C.B.

Headphone Jack P.C.B.

3. Checking of the MAIN P.C.B.

[RHD26016]

f

catch

catch

Step 1

Remove the top cabinet.

Step 2

Remove the front panel.

f

X
13

e

Step 3

b

b

b

b

Step 5

X 4

Step 6

Release 2 catches and pull the rear panel in
the direction of arrow 1 for about 10mm.
(Note : Main, Tuner and In/Out Terminal
P.C.B. are attach to the rear panel)

1

2

Step 7

Lift the rear panel in the direction of arrow

2 .

To Remove Front Panel, Panel P.C.B., Power Switch
P.C.B. and Headphone Jac k P.C.B.

f

b

Step 4

X 4

f

SA-EX310

Step 8

Connect the front panel to
the main P.C.B. as shown.

[XTB3+20JFZ] (Black)

f

[XTB3+8FFZ] (Black)

e

MAIN P.C.B. (Solder Side)

 Check the Main P.C.B. as shown


Main Component Replacement Procedures

Step 1

Remove the top cabinet.

Step 2 Cut the joints as shown below. (6 joints)

Step 4

Desolder the terminals of Power IC and
Regulator Transistor.

Step 3 Fold the joints. (6 joints)

1. Replacement of the Power IC and
Regulator Transistor

SA-EX310

Installation of the bottom cover after replacement

[XTB3+8J] (Black)

[XTW3+15T]

g

h

Step 1

Step 2

Align the ribs of bottom cover into the lugs.

Step 3
Screw (XTB3+8J)

(Prepare this screw to fix the bottom cover.)

1. After replacing the power IC or regulator transistor, apply a sufficient
quantity of compound grease (RFKX0002/SZZ0L15) between the

heat sink and the power IC or regulator transistor (Radiation
of power IC).

2. Tighten enough the screws ( ) after replacing the power IC and
regulator transistor. Otherwise, the heat radiation works little.

3. When installing or removing the power IC or transistor holder, be sure
to use an offset screwdriver.

 A long straight screwdriver cannot be used for removing or mounting

the screws since its long grip interferes with the neighbouring P.C.B.
and transformer.(See Fig.1 & 3)

 A short straight screwdriver may be used for removal, but cannot be

used for mounting because the limited space in the unit will not allow
sufficient tightening torque.(See Fig.2 & 3)

A short straight screwdriver

A long straight screwdriver

Fig.2

Fig.1

 Insufficient tightening will cause poor heat dissipation from the power

IC and regulator transistor and,in the worst case, may lead to their
thermal breakdown.

g

X 3

Step 5

g

g

Power IC (IC602)
[RSN3305-P]

g

Regulator transistor
(Q701,Q708)
[2SD2374PQAU,2SB1548PQAU]

*

h

Ribs

Lugs

CAUTION

SA-EX310

OFFSET SCREWDRIVER

The PROTO offset screwdriver No.34-

1

/4 is recommended for use in the application above.

The address of PROTO International Sales is as follows.

International Sales

International Sales Office
Stanley-Proto Industrial Tools
14117 Industrial Park Blvd.
Covington, GA 30209 U.S.A.
Fax: [phone]
Phone: [phone]

Australia, New Zealand &
South Pacific
Stanley-Proto Industrial Tools
P.O.Box 10
400 Whitehorse Road
Nunrweding 3131
Victoria, Australia
Fax: [phone]
Phone: [phone]

Singapore, Indonesia,
Philippines, Korea, Hong
Kong, Malaysia, China.
Stanley-Proto Asia Pacific
12 Gul Drive
Singapore 2262
Fax: [phone]
Phone: [phone]

Thailand
Stanley-Proto Thailand Ltd.
1017 Moo 13 Bangkaew
Amphur Bangplee
Samutprakarn, Thailand
Fax: [phone]
Phone: 66-2-316­8655

Japan
Stanley Works Japan
2-7-16 Hyakunin-Cho
Shinjuku-ku
Tokyo 160 Japan
Fax: [phone]
Phone: [phone]­8458

Mexico
Herramientas Stanley S.A.
DE C.V.
Apartado Postal 675
72030 Puebla, Pue, Maxico
Fax: [phone]
Phone: [phone]

South & Central America,
Puerto Rico, The Caribbian
Stanley Inter-America
2101 N.W. 84th Ave.
Miami, Florida 33122
Fax: [phone]

Phone: [phone]

Europe
Stanley-Proto Europe
Woodside, Sheffield
539PD
England
Fax: [phone]
Phone: [phone]

Canada
Stanley-Proto Canada
1100 Corporate Drive
Burlington, Ontorio
Canada, L7L 5R6
Fax: [phone]
Phone: [phone]

Middel East, Mediterranean
& Africa
Stanley-MEMA
Cory House The Rlng
Bracknell Berkshire
RG 12 1A2
England
Fax: [phone]
Phone: [phone]

Front Panel

About 9 cm
(A long straight screwdriver
connot be used)

Screws

Tuner & Tuner
Pack P.C.B.

Pro Logic
P.C.B.

Fig.3

Power
P.C.B.

Transformer
P.C.B.

AC In / Out
P.C.B.

SA-EX310

Fan Motor Troubleshooting

Is the air

cooling path blocked

or the fan motorjammed

by any external

obstacle ?

Are the

terminal voltage of

Q772 and Q773 normal in both

and inactive states of the

fan motor ?

(see table1.)

The power IC ( IC601 ) is defective.

The fan motor, power ICs and fan driver
are functioning normally.

YES

Is an audio signal

present at pins 7 and

10

of IC601

NO

YES

NO

Check the integrity of Q772, Q773 and the fan
motor driving circuit. (see Fig.1)

YES

Reinstall the fan on the unit.

Is the fan

motor's DC resistance

20 ~ 30Ω ?

Fan motor failure
Short circuit : DC resistance below 5Ω
Open circuit : DC resistance over 1kΩ

NO

NO

Remove the fan from the unit.

Remove the obstacle.

YES

The Model SA-EX310 employ fan motor error sensing electronics.
If the cooling fan is not operating and "OVER LOAD" is displayed on the FL display, check the fan motor and its driving circuit.

fan. off fan. on

E 14.5V 14.5V

Q772 C 0V 14.5V

B 14.5V 0V

E 0V 8.5V

Q773 C 14.5V 14.5V

B 0V 8.5V

(Table 1)

(Voltage table)

Fig.1

"OVER LOAD" is displayed on the FL display.

M

Q777

Q776

Q773

C775

0.022

2SB621AQSTA

REGULATOR

R778

R772

4.7K

MTZJ9R1CTA

D773

CP771

FAN
MOTOR

C773

0.022

R775

R771

+

+

R776

4.7 1/4W

330

Q772

R779

10K

R777

47K

R773

10K

Q778

47K

47K

C772

C771

35V4.7

50V4.7

R774

3.3M

D771 D772

1SS133

Q772,Q776

2SC1740SSTA

MOTOR DRIVE

Q777

2SA933SSTA

MOTOR DRIVE

Q778

RVTDTA114TST

MOTOR DRIVE

D774

1SS133

SA-EX310

REQUIRED ITEMS

1. Testing with a CD player  Test disc (SZZP1054C / first progarm, 1kHz, 0dB)

2. Testing with a tape deck  Test tape (QZZCLA / 315Hz, 0dB)

3. Testing with a AF oscillator  Set the output at 500Hz, 200mV

4. Oscilloscope (min. 10MHz) ----------- To measure the output waveform at the test points.

TEST PROCEDURE FOR AMPLIFIER CIRCUIT

When the CD player AF oscillator is connected: When the tape deck is connected:

Troubleshooting

This unit has test points on each circuit board block for use in troubleshooting.

CONNECTION

Connect either a CD player, tape deck or AF oscillator to the input terminals of the unit.

(

(

)

)

Power on the unit.
Set the input selector button of the unit to the "TAPE MONITOR"
postion.
Set the Speaker ON/OFF button of the unit to the SPEAKERS
"ON" position.

Run the tape deck

QZZCLA

315Hz, 0dB

(

)

Using the Oscilloscope, check the output waveforms at the test
points on the circuit boards of the unit in the following order:
(L1,R1) (L2,R2) (L3,R3) (L5,R5) (L6,R6).
Refer to page 10.

TEST POINTS POSITIONS OF AMPLIFIER CIRCUIT

Note: Connect the '+' probe of

the oscilloscope to each
test point and the ''
probe to chassis ground.

Power on the unit.
Set the input selector button of the unit to the "CD" postion.
Set the Speaker select buttons of the unit to the SPEAKERS "
ON" position.

Run the CD player or Run the AF oscillator

SZZP1054C / first program Oscillator output

1kHz, 0dB at 500Hz, 200mV

MAIN P.C.B. ( component side )

PANEL P.C.B. ( component side )

R6

L6

R5

L5

L1

R1

+

+

C1001

C1002

J248
J247

J319

J318

L2

C1004

C1067

R2

+

R3

L3

VR502

SA-EX310

Likely faulty block if the normal

TP CD player Tape deck AF oscillator waveform shown at the left is not

present.

L1/R1 Input selector block IC402 &

area

0.5msec 2V 1msec 500mV 1msec 500mV

L2/R2 Dolby pro logic blockIC1001 and

IC1002& area

0.5msec 2V 1msec 500mV 1msec 500mV

L3/R3 Master volume block VR501 &

area

0.5msec 500mV 1msec 50mV 1msec 100mV

L5/R5 Power limiter block Q601 to

Q602 & area

0.5msec 100mV* 1msec 500mV 1msec 500mV

L6/R6 Main amplifier block IC601 &

area

0.5msec 5V* 1msec 10V 1msec 10V

NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS

Measurement conditions. Volume control (VR501), Treble
control (VR512) and Bass control (VR511) positions :

*Volume control position (VR501) for these test :





CHECKING PROCEDURE FOR SURROUND CIRCUIT

Outputting surround signal normally requires that opposite phase signals be applied to both the left and right channels.
However, this unit incorporates a service mode, allowing the surround circuit to be tested using in-phase signals.

The letter SURROUND flash on the FL display.

When the CD player or AF oscillator is connected : When the tape deck is connected :

The letter SURROUND flash on the FL display.

Power on the unit.
Set the input selector button of the unit to the "CD"
position.

Power on the unit.
Set the input selector button of the unit to the "TAPE
MONITOR" position.

A

B

While pressing both "+" and "-" of the surround
level adjustment button "SURROUND, press the
"Power" button.

While pressing both "+" and "-" of the surround
level adjustment button "SURROUND, press the
"Power" button.

SA-EX310

Likely faulty block if the normal

TP CD player Tape deck AF oscillator waveform shown at the left is not

present.

C1 Dolby pro logic block

IC1001 and IC1002 & area

S1

0.5msec 1V 1msec 100mV 1msec 200mV

C2 Master volume block VR501 &

area

S2

0.5msec 200mV 1msec 20mV 1msec 50mV

C3 Tone control block IC551 & area

S3

0.5msec 200mV* 1msec 500mV 1msec 1V

( )

( )

B

Run the tape deck

Run the AF oscillatorRun the CD player

QZZCLA
315Hz, 0dB

( )

Oscillator output
at 500Hz, 200mV

SZZP1054C/first program
1kHz, 0dB

A

Using the Oscilloscope, check the output waveforms at the test points on
the circuit boards in the following order :
(C1,S1) (C2,S2) (C3,S3) (C4,S4) (C5,S5).

 To exit the service mode, power off the unit.

TEST POINTS POSITIONS OF SOURROUND CIRCUIT

NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS

PANEL P.C.B. ( component side )

Note: Connect the '+' probe of

the oscilloscope to each
test point and the ''
probe to chassis ground.

MAIN P.C.B. ( component side )

C1

S1

S3

C3

C4

+

+

C604

C603

J22

J21

J313

J316

S4

C5
S5

J246
J245

S2

+

C551

R552

C2

SA-EX310

NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS

The HIC protection circuit functions if any cord at a speaker terminal is short-circuited or if the unit overheats because of improper
operation. At the same time, OVERLOAD scrolls across the FL display.
In this state, all keys remain in operative; if any key is pressed, SWITCH OFF POWER scrolls across the FL display.
If an overload occurs, immediately power off the unit and check the speaker connection, venting holes and cooling fans. After
fixing any faults, power on the unit again and check for proper operation.
If no defects are found, or if the unit remains overload after it is power on again, check the circuit for faults.

CIRCUIT BLOCKS

OVERLOAD DETECTION FUNCTION

Likely faulty block if the normal

TP CD player Tape deck AF oscillator waveform shown at the left is not

present.

C4 Power limiter block

Q551 to Q552 & area

S4

0.5msec 200mV* 1msec 500mV 1msec 1V

C5 Main amplifier block IC601 &

area IC602 & area

S5

0.5msec 5V* 1msec 10V 1msec 1V*

Measurement conditions. Volume control (VR501), Tremble
control (VR512) and Bass control (VR511) positions :

*Volume control position (VR501) for these test :





SA-EX310

Block Diagram