Sony sa va100 Service Manual

SA-VA100

SERVICE MANUAL

• REAR SPEAKER

SECTION

T APE

SECTION

• FRONT SPEAKER SYSTEM

US Model

Australian Model

Model Name Using Similar Mechanism NEW CD Mechanism Type CDM-41 Optical Pick-up Type KSM-2101BBM (S) Model Name Using Similar Mechanism NEW T ape Transport Mechanism Type TCM-190RB53C

SPECIFICA TIONS

HOME ENTERTAINMENT AUDIO SYSTEM

MICROFILM

— 1 —

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE

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 microampers). 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 A C voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

— 2 —

0.15

1.5k

Ω

Earth Ground

AC voltmeter (0.75V)

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

TABLE OF CONTENTS

1. SERVCING NOTE

..............................................................4

2. GENERAL .................................................................... 4

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

3. DISASSEMBLY

3-1. Amplifier Block..................................................................26

3-2. Mechanism Component Block ...........................................27

3-3. CD Mechanism and TC Mechanism Block........................28

4. MECHANICAL ADJUSTMENT ................................... 30

5. ELECTRICAL ADJUSTMENT ..................................... 30

6. DIAGRAMS

6-1. Circuit Boards Location ..................................................... 38

6-2. Block Diagrams

• CD Section ....................................................................... 39

• Deck Section ....................................................................41

• OSD Section.....................................................................43

• Surround Amp Section.....................................................45

• Display Section ................................................................47

• Power Section .................................................................. 48

6-3. Printed Wiring Board — CD Section —............................50

6-4. Schematic Diagram — CD Section —...............................53

6-5. Schematic Diagram — Deck Section — ............................ 57

6-6. Printed Wiring Board — Deck Section — ......................... 61

6-7. Printed Wiring Board — OSD Section —.......................... 64

6-8. Schematic Diagram — OSD Section — ............................ 67

6-9. Schematic Diagram — Surround Amp Section —.............71

6-10. Printed Wiring Board — Surround Amp Section —..........75

6-11. Printed Wiring Board — Display Section — ..................... 79

6-12. Schematic Diagram — Display Section — ........................ 83

6-13. IC Block Diagrams ............................................................. 86

6-14. IC Pin Function

• IC106 CD System Controller

(µPD78058GC-225-3B9) ................................................ 93

• IC301 Deck System Control (HD6433522P01F) ............95

• IC401 Display Control, FL Driver

(µPD780204GF-020-3BA)..............................................97

• IC602 OSD Controller (HD6413004F) ........................... 99

• IC605 OSD (MB90095PF-G-175) ................................ 101

• IC1501 Surround System Control

(µPD78042FGF-026-3B9) ............................................ 102

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of soldering iron around 270˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS 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.

MODEL IDENTIFICATION — BACK PANEL —

• Abbreviation AUS: Australian model

7. EXPLODED VIEWS

7-1. L-ch Speaker System Section...........................................104

7-2. Amplifier Seciton ............................................................. 105

7-3. R-ch Speaker System Seciton........................................... 106

7-4. Mechanism Component Section....................................... 107

7-5. TC Mechanism Section 1 (TCM-190RB53C).................. 108

7-6. TC Mechanism Section 2 (TCM-190RB53C).................. 109

7-7. CD Mechanism Section 1 (CDM-41)............................... 110

7-8. CD Mechanism Section 2 (Tray Assembly) (CDM-41) ...111 7-9. CD Mechanism Section 3 (R Side Chassis Assembly)

(CDM-41) ......................................................................... 112

7-10. CD Mechanism Section 4 (Main Chassis Assembly)

(CDM-41) ......................................................................... 113

7-11. CD Mechanism Section 5 (Drive Unit Assembly)

(CDM-41) ......................................................................... 114

7-12. Rear Speaker System Section (SS-SR151) ...................... 115

8. ELECTRICAL PARTS LIST ........................................ 116

US model (Right) AUS model (Right) US model (Left) AUS model (Left)

— 3 —

MODEL

Parts No.

PARTS No.

4-981-882-0 4-981-882-1 4-981-883-0 4-981-883-1

SECTION 1

SERVICING NOTE

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objecti ve lens in the optical pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERA TION CHECK

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveform is output four times.

Cold Reset

Mode which clears all the user memories of this unit and sets them to the same state as that at shipment.

Fluorescent display tube, all LEDs lit, key-check mode

Method:

1. In the STANDBY state, press the DOLBY NR button, p button, and DISC 6 button together . All the fluorescent display tubes and LEDs light up.

2. Press any one button to set the key check mode.

3. When the key check mode is set, KEY TEST is displayed on the fluorescent display tube.

4. Total pressed number of buttons are displayed below the display. (When the ª, ·, ∏, ¬ buttons are pressed, the LEDs light up. Each time the DISC 1 to 7 buttons are pressed, the LEDs light up alternately in orange and green.) Buttons already pressed once will not be counted when pressed again.

5. When all 26 buttons are pressed, SUM OK is displayed on the fluorescent display tube.

6. To exit the mode, disconnect the AC plug from the outlet.

OSD Color Bar Mode (OSD:On Screen Display)

To c heck the video system of this unit, check that the color bar signal can be output.

1. In the STANDBY state, press the DOLBY NR button, p button, and OPEN/CLOSE button together.

2. The color bar is output. The color bar signal is output from the MONITOR OUT terminal.

3. To exit the mode, disconnect the AC plug from the outlet.

Method:

Press the DOLBY NR button, p button, and DISC 7 button together .

SHIP mode

This unit is provided with a SHIP mode to reduce damages of the mechanism section due to shocks during transportation. Set this mode after repairs before returning the product to the customer.

1. Press the SYSTEM POWER button, and check that all discs 1 to 7 are not in their trays.

2. Press the DOLBY NR button, p button, and DISC 7 button together, and perform cold reset.

3. Press the DIRECTION button, p button, and DISC 7 button together.

4. SHIP is displayed on the fluorescent display tube to indicate that the SHIP mode has been set.

5. When the mechanism section stops operating, disconnect the AC plug from the outlet.

Exiting the SHIP mode:

Insert the disconnected AC plug into the outlet again.

SECTION 2

GENERAL

This section is extracted from instruction manual.

Location of Parts and Controls

Left Front Speaker -Front panel-

1 READY indicator 2 OPERATE indicator 3 CENTER SPEAKER EXT indicator 4 CENTER SPEAKER INT indicator 5 SPEAKERS indicator 6 SPEAKER ON/OFF button 7 HEADPHONES jack

— 4 —

Right Front Speaker -Front panel-

3 4

!º !¡

1 DISC 1 to 7 buttons 2 SURROUND button 3 FUNCTION button 4 )/± button 5 · button 6 ≠/0 button 7 ª button 8 BAND button 9 TUNING – button !º TUNING + button !¡ TUNING MODE button !™ p STOP button !£ DOLBY NR button !¢ DIRECTION button !∞ EJECT § button !§ ∏ PAUSE button !¶ ® REC button !• Disc tray !ª MASTER VOLUME +/– buttons @º SYSTEM POWER button and

ON/STANDBY indicator

@¡ § OPEN/CLOSE button @™ Display window

@™

@¡

!ª !•

!¶

!∞

@º

!§

!¢

!£

!™

Remote commander

6 7

0 !¡

!™ !£

!¢

!∞

!§

!¶

1 MUTING button 2 TV CONTROL button 3 Video Source buttons

(VIDEO1, VIDEO2)

4 0 /PIP button 5 p /DISPLAY button 6 Numeric buttons

/0 button

8 >10 button 9 VISUAL ENTER button !º TUNER BAND button !¡ TAPE ª · button !™ CD · button !£ OSD ON/OFF button !¢ RETURN button !∞ EXIT button !§ ENTER button !¶ Cursor button !• TUNER MEMORY button !ª VOL buttons @º SW. MODE button

#ª #•

#¶

#§

#∞

#¢

#£

#™

#¡

#º

@ª

@•

@¶

@§ @∞

@¢

@£

@™

@¡

@º

!ª

!•

@¡ REPEAT button @™ PLAY MODE button @£ DISC SKIP button @¢ I/ALL DISCS button @∞ =/+ (CD),

0/) (TAPE) buttons

@§ p button @¶ P button @• TUNING –/+ buttons @ª TV VOL buttons #º CH buttons #¡ SUB CH/– button #™ TV/VIDEO button #£ r/+ button #¢ ANT TV VTR button #∞ P/JUMP button #§ )/POSITION button #¶ (/SWAP button #• POWER button #ª VISUAL POWER button

— 5 —

— 6 —

— 7 —

— 8 —

— 9 —

— 10 —

— 11 —

— 12 —

— 13 —

— 14 —

— 15 —

— 16 —

— 17 —

— 18 —

— 19 —

, note that you cannot use this function

when the CD has tracks numbered 21 or higher.

— 20 —

— 21 —

— 22 —

— 23 —

— 24 —

— 25 —

3-1. AMPLIFIER BLOCK

Grille frame assembly

Two screws (BVTT4x25)

SECTION 3

DISASSEMBLY

!™

Amplifier

Back panel (L)

Three tapping screws (BTP4x16)

!¡

Two connectors

Three tapping screws (BTP4x16)

Three screws (BVTP3x8)

Four screws (BVTP3x8)

Three tapping screws (BTP4x16)

Two screws (P3x14)

Front panel (L) assembly

Flat type wire (11 CORE)

PS board

CN1602

CN1603

— 26 —

3-2. MECHANISM COMPONENT BLOCK

Grille frame assembly

!º

Two tapping screws (BTP4x16)

!™

Two screws (BVTP3x8)

Back panel (R)

Two connectors

Three tapping screws (BTP4x16)

Two screws (BVTP3x8)

Three tapping screws (BTP4x16)

CN920

Two screws (P3x14)

Front panel (R) assembly

!£

Mechanism component block

!¡

Two tapping screws (BTP4x16)

CN952

!¢

Connector

CN921

Main board

TRANS board

— 27 —

3-3. CD MECHANISM AND TC MECHANISM BLOCK

1. Lid (TC)

Control panel (R) assembly

Screw (BVTP3x8)

Lid (TC)

Flat type wire (29 CORE)

Screw (BVTP3x8)

2. MAIN BOARD

Three screws (BVTP3x8)

Screw (BVTP3x8)

Two screws (BVTP3x8)

IC board

Main board

Push the button (EJECT).

Flat type wire (13 CORE)

!£

Screw (BVTP3x8)

!º

Flat type wire (5 CORE)

!∞

CD mechanism block

!™

Screw (BVTP3x8)

!¡

Connector (7P)

Screw (BVTP3x8)

Tapping screw

!¢

Three screws (BVTP3x8)

Screw (BVTP3x8)

— 28 —

3. CD MECHANISM

CD mechanism deck

Connector (2P)

Four CDM screws

CN101

Two screws (BVTP3x8)

CN102

CN105

CD board

CN103

Two screws (BVTP3x8)

CN104

Three CDM screws

Five connectors

4. TC MECHANISM

Flat type wire (7 CORE)

TC mechanism deck

Screw (BVTP3x8)

Two screws (BVTP3x8)

T wo screws (BVTP3x8)

TC board

Two screws (BVTP2.6x8)

— 29 —

SECTION 4

MECHANICAL ADJUSTMENTS

Precaution

1. Clean the following parts with a denatured alcohol-moistened

swab:

record/playback heads pinch rollers erase head rubber belts capstan idlers

2. Demagnetize the record/playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

Torque Measurement

Torque

FWD

FWD back tension

REV REV

back tension

FF/REW

FWD tension

REV tension

Torque meter Meter reading

CQ-102C

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

30 to 60 g • cm

(0.42 - 0.83 oz • inch)

1 to 5 g • cm

(0.014 - 0.069 oz • inch)

30 to 60 g • cm

(0.42 - 0.83 oz • inch)

1 to 5 g • cm

(0.014 - 0.069 oz • inch)

65 to 90 g • cm

(0.91 - 1.25 oz • inch)

110 g or more

(3.88 oz or more)

110 g or more

(3.88 oz or more)

Test Mode

Perform the tape deck adjustment after setting the test mode. 0 The sections where recording is started are memorized. When the 0 button is pressed after recording, the tape is rewound to the section where recording was started, and stops.

In this mode, the input source can be selected using the FUNCTION button. To playback the recorded tape, select the TAPE using the FUNCTION button. To play back the tape, select TAPE using the FUNCTION button. To exit the mode disconnect the AC plug from the outlet.

Method:

In the STANDBY state, press the DOLBY NR button, p button, and DISC 4 button together.

Record/Playback Head Azimuth Adjustment

Note:

Perform this adjustments for both decks.

Procedure:

1. Mode : Playback

test tape P-4-A100 (10kHz, –10dB)

level meter

SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION 0 dB=0.775V

1. Demagnetize the record/playback head with a head damagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the

parts adjusted.

4. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this

service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6. The adjustments should be performed for both L-CH and R-CH.

7. Switches and controls should be set as follows unless otherwise

specified.

DOLBY NR switch: OFF DIRECTION switch: D FUNCTION switch: TAPE

T ape

P-4-A100

WS-48B

P-4-L300

Signal

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

Used for

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

set

VIDEO 1 OUT

–

2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1 dB of peak.

L-CH peak

screw position

R-CH peak

output level

within 1dB

L-CH peak

R-CH peak

within 1dB

screw position

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