Sony STRV-7700 Service manual

STR-V7700

SERVICE MANUAL

STR-V7700 is RECEIVER section in MHC-V7700AV.

Manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY”, “PRO LOGIC” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

Amplifier section

Continuous RMS power output

FRONT SPEAKER:

China model 100+100 watts

6 ohms at 1 kHz, 10% THD (240V AC supply) 85+85 watts 6 ohms at 1 kHz, 10% THD (220V AC supply)

Other models 100+100 watts

(6 ohmsat 1 kHz,10% THD) CENTER SPEAKER: 45watts (reference) (8 ohms at 1 kHz, 10% THD) REAR SPEAKER: 30+30 watts (reference) (8 ohms at 1 kHz, 10% THD)

Peak music power output:

1800 watts (reference)

Inputs MD/VIDEO 1 IN (phono

jacks): voltage 250 mV, impedance 47 kilo ohms AV INPUT AUDIO (phono jacks): voltage 250 mV, impedance 47 kilo ohms MIX MIC 1/2 (phone jack): sensitivity 1 mV, impedance 10 kilo ohms

Outputs MD/VIDEO 1 OUT

(phono jacks): voltage 250 mV, impedance 1 kilo ohm PHONES (stereo phone jack): accepts headphones of 8 ohms or more.

Video section

Inputs AV INPUT VIDEO

Outputs MONITOR OUT (phono

Tuner section

FM stereo, FM/AM superheterodyne tuner

FRONT SPEAKER: accepts impedance of 6 to 16 ohms CENTER SPEAKER: accepts impedance of 8 to 16 ohms REAR SPEAKER: accepts impedance of 8 to 16 ohms SUPER WOOFER: Voltage 1 V, impedance 1 kilo ohm

(phono jack): 1 Vp-p, 75 ohms VIDEO IN (phono jack): 1 Vp-p, 75 ohms

jack): 1 Vp-p, 75 ohms VIDEO OUT (phono jack): 1 Vp-p, 75 ohms S-VIDEO (4-pin/miniDIN jack): Y: 1 Vp-p, unbalanced, sync negative C: 0.286 Vp-p, load impedance 75 ohms

E Model

Chinese Model

FM tuner section

Tuning range 87.5-108.0 MHz Antenna terminals 75 ohm unbalanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range Thai models: 531-1,602 kHz

(with the AM tuning interval set at 9 kHz) 530-1,710 kHz (with the AM tuning interval set at 10 kHz)

Other models: MW

531-1,602 kHz (with the MW tuning interval set at 9 kHz) 530-1,710 kHz (with the MW tuning interval set at 10 kHz) SW

5.95-17.90 MHz (with the SW tuning

interval set at 5 kHz) Intermediate frequency450 kHz Antenna AM loop antenna

External antenna terminal

— Continued on next page —

FM STEREO/FM-AM RECEIVER

MICROFILM

General

Power requirements Thai model: 220-240V AC, 50/60 Hz Other models: 110-120V or 220-240V

AC, 50/60Hz Adjustable with voltage selector

Power consumption 230watts Dimensions (w/h/d) Approx. 280 × 205 × 336 mm Mass Approx. 7.0kg

Design and specifications are subject to change without notice.

TABLE OF CONTENTS

1. GENERAL

······································································ 3

2. TEST MODE ·································································· 5

3. DIAGRAMS···································································· 6

3-1. Circuit Boards Location ····················································· 6 3-2. Printed Wiring Board — Panel Section —·························7 3-3. Schematic Diagram — Panel Section — ··························· 9 3-4. Printed Wiring Board — Main Section — ······················· 12 3-5. Schematic Diagram — Main Section — ·························· 15 3-6. Printed Wiring Board and Schematic Diagram

— Amp/Key con Section —············································ 19

3-7. Printed Wiring Board and Schematic Diagram

— Mic Echo/AV in Section — ········································ 23

3-8. Printed Wiring Board and Schematic Diagram

— Power Section —························································26 3-9. IC Pin Function ································································ 29 3-10. IC Block Diagrams ··························································· 31

4. EXPLODED VIEWS

4-1. Main Section····································································· 33 4-2. Panel Section ···································································· 34

5. ELECTRICAL PARTS LIST ··································· 35

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 .

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tentalum capacitor may be damaged

by heat.

— 2 —

— FRONT PANEL —

SECTION 1

GENERAL

12345678 9!º!¡ !™

$º

#ª

#• #¶ #§ #∞ #¢ #£

#™

1 KARAOKE PON/MPX button 2 DSP button 3 EFFECT ON/OFF button 4 MUSIC button 5 MOVIE button 6 GAME button 7 P FILE button 8 MEMO button 9 DBFB button !º VOLUME !¡ GROOVE button !™ TUNER BAND button !£ STEREO/MONO button !¢ FUNCTION button !∞ MIC LEVEL/ECHO VOL !§ MIX MIC 1 jack !¶ MIX MIC 2 jack !• PHONES jack !ª EDIT button @º PLAY MODE button

#¡

!£

!¢

!∞ !§

!¶ !•

!ª@º@¡@™@£@¢@¶ @∞@§@•@ª#º

@¡ 1/ALL DISCS button @™ REPEAT button @£ HIGH FREQ button @¢ ENTER/NEXT button @∞ MULTI JOG STATION dial @§ LOW FREQ button @¶ MEMORY button @• TUNING MODE button @ª FLASH button #º LOOP button #¡ WAVE button #™ AV INPUT jack #£ CLOCK TIMER SET button #¢ TIMER SELECT button #∞ KEY CONTROL ˜ button #§ KEY CONTROL n button #¶ DOLBY PROLOGIC button #• C. MODE button #ª DISPLAY/DEMO button $º POWER button

— 3 —

— BACK PANEL —

$ª

$¡

$™

$£

$¢

$∞

$§ $¶

$•

$¡ SYSTEM CONTROL $™ MD/VIDEO 1 jack $£ FRONT SPEAKER terminal $¢ SUPER WOOFER jack $∞ VIDEO OUT jack $§ CENTER SPEAKER terminal $¶ REAR SPEAKER terminal $• VOLTAGE SELECTOR switch (EXCEPT TH, KR) $ª ANTENNA terminal

• Abbreviation TH : Thai KR : Korean

— 4 —

SECTION 2

TEST MODE

FL DISPLAY/KEY LED TEST MODE

Press the REPEAT, ENTER/NEXT and SURROUND buttons simultaneously.

1. All FL segments and all LEDs turn on.

2. To access the microprocessor information, press the P FILE key. Each pressing of the P FILE key adv ances the display on the FL tube in the following sequence.

STR microprocessor version number HCD microprocessor version number

VCD microprocessor version number (VCD model only)

Model name Destination

3. To check the encoder , press the MUSIC key . The follo wing display

appears on the FL tube. "K0J0V0"

The number after K indicates the number of times that the key is pressed. The key which was pressed in the past, is not counted. The key which is pressed hereafter is counted. Pressing any key increases the number after K.

The number after J indicates the number of rotations that the JOG dial is rotated. Turning the JOG dial clockwise increases the number after J. Turning the JOG dial counter-clockwise decreases the number after J.

The number after V indicates the number of rotations that the VOLUME dial is rotated. Turning the VOLUME dial clockwise increases the number after V. Turning the VOLUME dial counterclockwise decreases the number after V.

To exit this mode, perform the "Cold Reset" (reset clearing memory) as described below.

GENERAL TEST MODE (INCLUDING AMPLIFIER AND TUNER)

Press the REPEAT, ENTER/NEXT and CLOCK TIMER SET buttons simultaneously while the main power is on.

1. Sound volume display segment starts blinking.

2. The tuning enters the PRESET mode.

3. Rotating the VOLUME control clockwise increases the volume level to maximum. Rotating the VOLUME control counter-clockwise decreases the volume level to minimum.

4. Pressing the MUSIC key decreases the equalizer curve to minimum and "EQ CHECK" appears on the display. Pressing the MOVIE key increases the equalizer curve to maximum. Pressing the GAME key makes the equalizer curve flat.

5. Pressing any of the DBFB, GROOVE or SURROUND key disappears "EQ CHECK" on the display.

To exit this mode, perform the "Cold Reset" (reset clearing memory) as described below.

AGING MODE

1. CD aging mode To execute the CD aging, set the three discs to the CD tray and set the function to CD. REPEAT, ENTER/NEXT and LOOP buttons simultaneously. The CD aging mode starts and the disc calendar starts blinking.

2. Tape aging mode To execute the tape aging, set the two tapes to the tape A and B drives. Set the function to T APE. Press the REPEA T , ENTER/ NEXT and LOOP buttons simultaneously. Press the A forward key to start the tape aging mode. "AGING" appears on the display.

CD SERVICE MODE

Turn on the main power. Press the REPEAT, ENTER/NEXT and KARAOKE PON/MPX buttons simultaneously. VACS toggles between ON and OFF.

VACS LEVEL DISPLAY

Turn on the main power. Press the EDIT, ENTER/NEXT and KARAOKE PON/MPX buttons simultaneously. VACS level appears on the display.

CD SHIP MODE

Turn on the main power. Press the PLAY MODE and POWER buttons simultaneously. The main power is turned off and LOCK appears on the display.

TUNER STEP CHANGE

Turn on the main power. Set the function to TUNER. Select MW band from the present tuning. Turn off the main power. Press the ENTER/NEXT and POWER buttons simultaneously. The main power is turned on and the changed step appears on the display.

MD/VIDEO 1 FUNCTION CHANGE

Press the FUNCTION and POWER buttons simultaneously while the main power is off. When the function is set to VIDEO 1, the function is changed to MD and MD appears on the display. When the function is set to MD, the function is changed to VIDEO 1 and VIDEO 1 appears on the display.

COLD RESET (Reset which clears memory.)

Press the REPEAT, ENTER/NEXT and DISPLAY buttons simultaneously at any time. The system is reset while clearing memory.

HOT RESET (Reset which does not clear memory.)

Press the REPEAT, ENTER/NEXT and TIMER SELECT buttons simultaneously at any time. The system is reset without clearing memory.

3-1. CIRCUIT BOARDS LOCATION

SEC BOARD

PANEL BOARD

AVIN BOARD

JOG BOARD

VOLUME BOARD

PRI BOARD

SECTION 3 DIAGRAMS