Technics SAEX-310 Service manual

ORDER NO. MD9707082C2

AV Control Stereo Receiver

Receiver

SA-EX310

Colour

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

Area

Suffix for Model No.

(E) Europe

(EB) Great Britain

(EG) Germany and Italy

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.

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

Area

Colour

(K)

SA-EX310

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 /

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 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)

IF rejection ( at 999 kHz ) 55 dB

+ 400 kHz 65 dB

75Ω

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

Channel balance (250 Hz - 6.3 kHz ) Limitting point 1.2 µV Bandwidth

IF amplifier 180 kHz FM demodulator 1000 kHz

Antenna terminal(s) 75Ω (unbalanced)

+1.5 dB

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

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) CD, TAPE, VCR, TV/DVD 10Hz  40kHz,

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)

+0.8 dB

+3 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) Channel separation 55 dB Headphones output level and impedance 430 mV / 330 Ω Subwoofer frequency responce 7 100 Hz,

+ 1 dB

+ 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

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.

Caution for AC Main Leads

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

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.

A S

or the BSI mark on the body

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.

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

Fuse cover

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.

Figure B

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

Figure A

Fuse (5 ampere)

Figure B

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.

 Contents

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

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

Checking Procedure For Each Major P.C.B.

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

Step 1

Step 2

PANEL P.C.B. (Solder Side)

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

TUNER P.C.B. (Solder Side)

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

Step 1

Remove the top cabinet.

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

IN/OUT TERMINAL

P.C.B.

Catch

[SNE2129-1] (Black)

[XTBS3+8JFZ1] (Black)

Catch

Step 2

X 14

SA-EX310

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

Step 1

Remove the top cabinet.

Step 5

Pull out 3 knobs.

X 3

Step 2

Step 3

Remove the front panel in

the direction of arrow.

Power Switch P.C.B.

Headphone Jack P.C.B.

Step 4

Remove the Volume Knob and Nut.

Panel P.C.B.

Step 8

Pull out the Headphone

Jack P.C.B.

Step 6

Step 7

X 1

[XTBS26+10J]

[RHD26016]

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

Step 1

Remove the top cabinet.

Step 2

Remove the front panel.

Step 3

X 13

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)

Step 4

X 4

Step 5

Step 7

Lift the rear panel in the direction of arrow

2 .

catch

X 4

catch

SA-EX310

Step 8

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

 Check the Main P.C.B. as shown 

Main Component Replacement Procedures

1. Replacement of the Power IC and Regulator Transistor

Step 1

Remove the top cabinet.

MAIN P.C.B. (Solder Side)

[XTB3+8FFZ] (Black)

[XTB3+20JFZ] (Black)

Step 3 Fold the joints. (6 joints)

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

Step 4

Desolder the terminals of Power IC and Regulator Transistor.

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

SA-EX310

Step 5

X 3

Installation of the bottom cover after replacement

Step 1

Step 3

Ribs

Lugs

Screw (XTB3+8J) (Prepare this screw to fix the bottom cover.)

Power IC (IC602) [RSN3305-P]

Step 2

Align the ribs of bottom cover into the lugs.

[XTW3+15T]

CAUTION

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)

[XTB3+8J] (Black)

A short straight screwdriver

Fig.2

 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.

A long straight screwdriver

Fig.1

SA-EX310

Transformer P.C.B.

Power P.C.B.

Screws

AC In / Out P.C.B.

Tuner & Tuner Pack P.C.B.

Pro Logic P.C.B.

Fig.3

Front Panel

OFFSET SCREWDRIVER

The PROTO offset screwdriver No.34-

/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: 706-786-4387 Phone: 706-787-3800

Singapore, Indonesia, Philippines, Korea, Hong Kong, Malaysia, China. Stanley-Proto Asia Pacific 12 Gul Drive Singapore 2262 Fax: 65-861-3206

Australia, New Zealand &

Phone: 65-862-0883 South Pacific Stanley-Proto Industrial Tools P.O.Box 10 400 Whitehorse Road Nunrweding 3131 Victoria, Australia Fax: 61-3-894-1173 Phone: 61-3-878-9244

Thailand

Stanley-Proto Thailand Ltd.

1017 Moo 13 Bangkaew

Amphur Bangplee

Samutprakarn, Thailand

Fax: 66-2-316-6071

Phone: 66-2-316-

8655

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

Japan Stanley Works Japan 2-7-16 Hyakunin-Cho Shinjuku-ku Tokyo 160 Japan Fax: 81-3-3360-8456 Phone: 81-3-33608458

Mexico Herramientas Stanley S.A. DE C.V. Apartado Postal 675 72030 Puebla, Pue, Maxico Fax: 52-22-494-4880 Phone: 52-22-495-300

South & Central America, Puerto Rico, The Caribbian Stanley Inter-America 2101 N.W. 84th Ave. Miami, Florida 33122 Fax: 305-594-4261

Phone: 305-591-3828

Europe Stanley-Proto Europe Woodside, Sheffield 539PD England Fax: 44-742-739-038 Phone: 44-742-768-888

Canada Stanley-Proto Canada 1100 Corporate Drive Burlington, Ontorio Canada, L7L 5R6 Fax: 416-335-0075 Phone: 416-335-0075

Middel East, Mediterranean & Africa Stanley-MEMA Cory House The Rlng Bracknell Berkshire RG 12 1A2 England Fax: 44-344-485-526 Phone: 44-344-51813

SA-EX310

Fan Motor Troubleshooting

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.

"OVER LOAD" is displayed on the FL display.

Is the air

cooling path blocked

or the fan motorjammed

by any external

obstacle ?

Remove the fan from the unit.

YES

Remove the obstacle.

motor's DC resistance

Reinstall the fan on the unit.

Q772 and Q773 normal in both

and inactive states of the

(Voltage table)

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)

Is the fan

20 ~ 30Ω ?

YES

Are the

terminal voltage of

fan motor ?

(see table1.)

YES

D771 D772

1SS133

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

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

Q772,Q776

2SC1740SSTA

MOTOR DRIVE

Q777

2SA933SSTA

MOTOR DRIVE

D774

1SS133

Q778

RVTDTA114TST

MOTOR DRIVE

C773

R776

Q773

2SB621AQSTA

REGULATOR

0.022

C772

C771

R774

35V4.7

50V4.7

3.3M

47K

R772

47K

R771

R779

10K

Q772

R778

4.7K

Q778

R777

R773

R775

330

47K

10K

Q777

Q776

4.7 1/4W

D773

0.022

CP771

FAN

MOTOR

MTZJ9R1CTA

C775

Is an audio signal

present at pins 7 and

of IC601

YES

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

Fig.1

The power IC ( IC601 ) is defective.

SA-EX310

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.

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:

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

(

)

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

MAIN P.C.B. ( component side )

J248

L6 R6

J247

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

(

Note: Connect the '+' probe of

PANEL P.C.B. ( component side )

315Hz, 0dB

)

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

J318 J319

C1067

C1004

C1001

C1002

VR502

SA-EX310

NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS

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

L1/R1 Input selector block IC402 &

area

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

Likely faulty block if the normal

present.

L2/R2 Dolby pro logic blockIC1001 and

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

L3/R3 Master volume block VR501 &

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 &

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

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

*Volume control position (VR501) for these test :

IC1002& area

area



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.

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

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

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

The letter SURROUND flash on the FL display.

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

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

The letter SURROUND flash on the FL display.

SA-EX310

Run the AF oscillatorRun the CD player

SZZP1054C/first program

( )

1kHz, 0dB

Oscillator output

( )

at 500Hz, 200mV

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

MAIN P.C.B. ( component side )

J246

C5 S5

J245

Run the tape deck

PANEL P.C.B. ( component side )

QZZCLA

( )

315Hz, 0dB

Note: Connect the '+' probe of

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

C551

R552

C604

J316

J313

C603

J22

S1 C1

J21

NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS

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

C1 Dolby pro logic block

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

C2 Master volume block VR501 &

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

Likely faulty block if the normal

present.

IC1001 and IC1002 & area

area

C3 Tone control block IC551 & area

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

NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS

SA-EX310

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

C4 Power limiter block

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

C5 Main amplifier block IC601 &

area IC602 & area

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 :

Likely faulty block if the normal

present.

Q551 to Q552 & area



CIRCUIT BLOCKS

OVERLOAD DETECTION FUNCTION

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.

SA-EX310

Block Diagram

+ 31 hidden pages