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STR-V5550/V7770
E Model
Chinese Model
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
MICROFILM
SPECIFICATIONS
This set is the tuner and amplifier
section in MHC-V5550/V7770AV.
Amplifier section
The following measured at AC 230V 50/60 Hz
DIN power output (Rated) (FRONT)
95 + 95W (6
at 1kHz DIN)
Continuous RMS power output (Reference)
FRONT SPEAKER: 110 + 110W
(6
at 1kHz, 10% THD)
CENTER SPEAKER: 55W
(8
at 1kHz, 10% THD) (V7770)
REAR SPEAKER: 35 + 35W
(8
at 1kHz, 10% THD) (V7770)
The following measured at AC 120, 220, 240V 50/60Hz
DIN power output (Rated) (FRONT)
100 + 100W (6
at 1kHz DIN)
Continuous RMS power output (Reference)
FRONT SPEAKER: 120 + 120 W
(6
at 1kHz, 10% THD)
CENTER SPEAKER: 60W
(8
at 1kHz, 10% THD) (V7770)
REAR SPEAKER: 40 + 40W
(8
at 1kHz 10% THD) (V7770)
Peak music power output 2400W (V7770)
2000W (V5550)
Inputs
MD/VIDEO 1 IN (phone jacks): voltage
450/250mV, impedance 47k
AV INPUT AUDIO (phone jacks): voltage
250mV, impedance 47k
MIX MIC 1/2 (phone jack): sensitivity 1mV,
impedance 10k
Output
MD/VIDEO 1 OUT (phono jacks): voltage
450/250mV, impedance 1k
PHONES (stereo phone jack): accepts
headphones of 8
or more.
FRONT SPEAKER:
accepts impedance of 6 to 16
CENTER SPEAKER:
accepts impedance of 8 to 16
(V7770)
REAR SPEAKER:
accepts impedance of 8 to 16
SUPER WOOFER:
Voltage 1V, impedance 1k
Photo : STR-V7770
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
87.5 ­ 108.0MHz
Aerial
FM lead aerial
Aerial terminals
75
unbalanced
Intermediate frequency
10.7MHz
AM tuner section
Tuning range
Thai models:
531 ­ 1,602kHz (with the AM tuning
interval set at 9kHz)
530 ­ 1,710kHz (with the AM tuning
interval set at 10kHz)
Other models:
MW: 531 ­ 1,602kHz (with the MW tuning
interval set at 9kHz)
530 ­ 1,710kHz (with the MW tuning
interval set at 10kHz)
SW: 5.95 ­ 17.90MHz (with the SW tuning
interval set at 5kHz)
Intermediate frequency
450kHz
Antenna
AM loop antenna External antenna terminal
General
Power requirements
Chinese, Thai models:
220V AC, 50/60Hz
Other models:
120V or 220V or 230 ­ 240, 50/60Hz
Adjustable with voltage selector
Power consumption
300W
Dimensions (w/h/d)
Approx. 288
× 205 × 375mm
Mass
Approx. 8.8kg
Design and specifications are subject to change without notice.


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-- 2 --
TABLE OF CONTENTS
1. GENERAL ··········································································· 3
2. DISASSEMBLY
2-1.
Sliding Panel Assembly ······················································ 5
3. SERVICE MODE ······························································· 6
4. DIAGRAMS
4-1.
Circuit Boards Location ··················································· 10
4-2.
Block Diagrams
· Main Section ·································································· 11
· Power Section ································································ 13
4-3.
Printed Wiring Board ­ Main Section ­ ··························· 17
4-4.
Schematic Diagram
­ Main (1/2) Section (V5550 Model) ­ ···························· 19
4-5.
Schematic Diagram
­ Main (1/2) Section (V7770 Model) ­ ···························· 21
4-6.
Schematic Diagram ­ Main (2/2) Section ­ ····················· 23
4-7.
Schematic Diagram ­ Power Amp Section ­ ··················· 25
4-8.
Printed Wiring Board ­ Power Amp Section ­ ················· 27
4-9.
Schematic Diagram ­ Display Section ­ ·························· 29
4-10. Printed Wiring Board ­ Display Section ­ ······················· 31
4-11. Schematic Diagram ­ Sliding Panel Section ­ ················· 33
4-12. Printed Wiring Board ­ Sliding Panel Section ­ ·············· 35
4-13. Schematic Diagram ­ Surround Amp Section ­ ··············· 37
4-14. Printed Wiring Board ­ Surround Amp Section ­ ············ 39
4-15. Printed Wiring Board ­ Trans Section ­ ··························· 41
4-16. Schematic Diagram ­ Trans Section ­ ····························· 43
4-17. Schematic Diagram ­ AV/Mic Section ­ ·························· 44
4-18. Printed Wiring Board ­ AV/Mic Section ­ ······················· 45
4-19. IC Block Diagrams ··························································· 46
4-20. IC Pin Function ································································ 49
5. EXPLODED VIEWS
5-1.
Case and Sliding Panel Section ········································ 52
5-2.
Front Panel Section ·························································· 53
5-3.
Slide Mechanism Section ················································· 54
5-4.
Circuit Boards and Back Panel Section ···························· 55
6. ELECTRICAL PARTS LIST ········································· 56
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 --
V5550: Hong Kong, Malaysia, Singapore,
Indonesia
4-900-848-5
V7770: Hong Kong, Malaysia, Singapore
4-900-848-6
V7770: Thai, Chinese
4-900-848-7
V5550: Chinese
4-900-848-8
MODEL
PART No.
LABEL MODEL NUMBER
No.


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-- 3 --
Front Panel
SECTION 1
GENERAL
1 MOVIE button
2 MUSIC button
3 GAME button
4 PLACE button
5 P FILE button
6 EFFECT ON/OFF button
7 OPEN/CLOSE button
8 TUNER BAND button
9 STEREO/MONO button
!º MEMORY button
!¡ KARAOKE PON/MIX button
!TM MIC LEVEL/ECHO VOL dial
!£ MIX MIC1 jack
!¢ GROOVE button
! VOLUME dial
!§ ) + button
!¶ ENTER/NEXT button
!· MULTI JOG STATION dial
!ª 0 ­ button
@º NON-STOP button
@¡ EDIT button
@TM FLASH button
@£ PLAY MODE button
@¢ REPEAT button
@ PHONES jack
@§ LOOP button
@¶ CLOCK/TIMER SET button
@· TIMER SELECT button
@ª FUNCTION button
#º PROLOGIC button
#¡ DSP button
#TM DBFB button
#£ DISPLAY/DEMO button
#¢ I/u (POWER) button
# MIX MIC2 jack
#§ KEY CONTROL (n)
#¶ KEY CONTROL (~)
12
3
45
6
7
8
9
!TM
#
!
!¶ !§
@
#TM
@TM
Photo : STR-V7770


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-- 4 --
Rear Panel
1 SYSTEM CONTROL jack
2 ANTENNA terminal
3 CENTER SPEAKER terminal
4 REAR SPEAKER terminal
5 MONITOR OUT jack
6 FRONT SPEAKER terminal
7 MD/VIDEO 1 jack
2
4
5
3
1
6
7
Photo : STR-V7770 (Chinese model)


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-- 5 --
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-1. SLIDING PANEL ASSEMBLY
· NOTE FOR INSTALLATION (LEVEL SLIDER)
(Perform this DISASSEMBLY after the front panel is removed.)
NOTE :
Attach in the reverse order, but make sure the rollers (
a, b) of the
holder (L) assembly and holder (R) assembly fit into the grooves of
the level slider.
4 Flat type cable (19 core)
2 Screw (BVTP 3
× 8)
3 Holder level
5 Sliding panel assembly
Slide mechanism
1 Push the OPEN/CLOSE button to
open the Sliding panel assembly.
1 Screw (BVTP2.6
× 8)
4 Four screws
(BVTP2.6
× 8)
5 Holder (L) assembly
a
a
b
b
6 Four screws (BVTP2.6
× 8)
7 Holder (R) assembly
8 Remove the Level slider direction of arrow.
2 Screw
(BVTP2.6
× 8)
3 Top bracket