Sony CX-VX55 User manual

1
Ver. 1.32005. 10
SERVICE MANUAL
AEP Model
UK Model
E Model
Australian Model
CX-VX55/VX77
General
Power supply 220 – 240 V AC, 50/60 Hz
Power consumption 100 W, No more than 1 W
(220 – 240 V AC)
(at the power saving mode)
Mass 4.9 kg
External dimensions 430 ×70 ×370.5 mm
(W ×H ×D)
Operating conditions
Temperature: 5 – 35°C
Operation status: Horizontal
Operating humidity 5 – 85%
CD/DVD
Laser Semiconductor laser,
wavelength 650 nm
for VCD and DVD,
wavelength 780 nm for CD
Emission duration Continuous
Signal system CX-VX55:
PAL 625/50, NTSC 525/60
(AEP, UK, CET, E3)
NTSC 525/60 (E41)
PAL, NTSC (AUS, SP, RU)
CX-VX77: PAL, NTSC
Frequency response 2 Hz – 20 kHz (±1.0 dB)
(audio)
Signal-to-noise ratio More than 75 dB
(audio) (1 kHz, NOP,
20 kHz LPF/A-Filter)
Dynamic range (audio) More than 70 dB
Harmonic distortion 0.5% (1 kHz, at 12 W position)
(audio) (20 kHz LPF/A-Filter)
SPECIFICATIONS
Video
Inputs
VIDEO (AUDIO IN): Sensitivity: 800 mV
Impedance: 50 kilohms
MIC (phone jacks): Sensitivity: 4 mV
Impedance: 10 kilohms
SCART (AUDIO IN): AEP, UK, CET, RU model:
Sensitivity: 800 mV
Impedance: 50 kilohms
Video output 1.0 V (p-p), 75 Ω,
negative sync., RCA jack
AEP, UK, CET, RU model:
EURO AV (TO TV)
S VIDEO OUT E3, E41, AUS, SP model:
(Y) 1.0 V (p-p), 75 ohms,
negative sync.,
Mini DIN 4-pin ×1
(C) 0.286 V (p-p), 75 ohms
COMPONENT VIDEO OUT
E3, E41, AUS, SP model:
(Y) 1.0 V (p-p), 75 ohms,
negative sync., RCA jack ×1
(PB/CB)/(PR/CR) 0.7 V (p-p),
75 ohms, RCA jack ×2
Sony Corporation
Personal Audio Division
Published by Sony Engineering Corporation
9-879-239-04
2005J04-1
© 2005. 10
– Continued on next page –
DVD RECEIVER
•CX-VX55/VX77 are DVD receiver
in AVJ-X55/X77. Photo: CX-VX55
Manufactured under license from Dolby Laboratories. “Dolby”,“ProLogic”,
and the double-D symbol are trademarks of Dolby Laboratories.
Confidential Unpublished works. Copyright 1992–1997 Dolby
Laboratories. All rights reserved.
Manufactured under license from Digital Theater Systems, Inc. US Pat. No.
5,451,942 5,956,674, 5,974,380, 5,978,762 and other worldwide patents
issued and pending. “dts” and “DTS Digital Surround” are registered
trademarks of Digital Theatre Systems, Inc. Copyright 1996, 2000 Digital
Theater Systems, Inc.All rights reserved.
Model Name Using Similar Mechanism CX-VX33

2
CX-VX55/VX77
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON 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.
Tuner
FM
Tuning range 87.5 – 108 MHz
Intermediate frequency 10.7 MHz
Signal-to noise ratio 60 dB (Mono)
AM (MW)
Tuning range 522 – 1,611 kHz
Intermediate frequency 450 kHz
Amplifier
Stereo mode 80 W + 80 W
(6 Ωat 1 kHz, THD 10%)
Surround mode Front: 80 W + 80 W
(*Depending on the Centre*: 80 W
sound mode settings Surround*: 80 W + 80 W
and the source, there (6 Ωat 1 kHz, THD 10%)
may be no sound Subwoofer*: 150 W
output.) (3 Ωat 50 Hz, THD 10%)
Outputs PHONES: (32 Ω, 25 mW)
Design and specifications are subject to change without
notice.
•Abbreviation
CET : East European & Russian model
E3 : 240V AC area in E model
E41 : 230V AC area in E model
AUS : Australian model
SP : Singapore model
RU : Russian model
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.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges oc-
cur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

3
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
CX-VX55/VX77
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown 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 objective 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 component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
This appliance is
classified as a CLASS 1
LASER product. The
label is located on the
left side of the unit as
viewed from the front.
TABLE OF CONTENTS
1. GENERAL
Front Panel Controls................................................................ 4
Display Window Indicators ..................................................... 5
Remote Control ....................................................................... 6
Rear Panel Connections (AEP, UK, CET, RU Model) ............ 7
Rear Panel Connections (E3, E41,AUS, SP Model)............... 8
2. DISASSEMBLY
2-1. Top Cover ............................................................................ 9
2-2. Front Panel Assy ............................................................... 10
2-3. DVD Mechanism Deck ..................................................... 10
2-4. Rear Panel Section ............................................................ 11
2-5. SMPS Board ...................................................................... 11
2-6. DVD Board ....................................................................... 12
2-7. Main Board ....................................................................... 12
2-8. Base Unit ........................................................................... 13
3. ELECTRICAL TROUBLESHOOTING GUIDE
3-1. Audio Part.......................................................................... 14
3-2. DVD Part ........................................................................... 18
3-3. Details and Waveforms on System Test and Debugging... 25
4. TEST MODE ..................................................................... 38
5. ELECTRICAL ADJUSTMENT.................................... 39
6. DIAGRAMS
6-1. Block Diagram –DVD Section–........................................ 41
6-2. Block Diagram –Audio Section– ...................................... 42
6-3. Block Diagram –Tuner/Power Section–............................ 43
6-4. Printed Wiring Boards –DVD Section (1/2)–....................45
6-5. Printed Wiring Board –DVD Section (2/2)– ..................... 46
6-6. Schematic Diagram –DVD Section (1/3)–........................ 47
6-7. Schematic Diagram –DVD Section (2/3)–........................ 48
6-8. Schematic Diagram –DVD Section (3/3)–........................ 49
6-9. Printed Wiring Board –Main Section (1/2)– ..................... 50
6-10. Printed Wiring Board –Main Section (2/2)– ..................... 51
6-11. Schematic Diagram –Main Section (1/5)– ........................ 52
6-12. Schematic Diagram –Main Section (2/5)– ........................ 53
6-13. Schematic Diagram –Main Section (3/5)– ........................ 54
6-14. Schematic Diagram –Main Section (4/5)– ........................ 55
6-15. Schematic Diagram –Main Section (5/5)– ........................ 56
6-16. Printed Wiring Board –Display Section– ..........................57
6-17. Schematic Diagram –Display Section–............................. 58
6-18. Printed Wiring Board –Key Section– ................................ 59
6-19. Schematic Diagram –Key Section–................................... 60
6-20. Printed Wiring Board –Power Section– ............................61
6-21. Schematic Diagram –Power Section– ............................... 62
7. EXPLODED VIEWS
7-1. Front Panel Section ...........................................................67
7-2. Boards Section .................................................................. 68
7-3. DVD Mechanism Section.................................................. 69
8. ELECTRICAL PARTS LIST ........................................ 70
Ver. 1.1

4
CX-VX55/VX77 SECTION 1
GENERAL This section is extracted
from instruction manual.
INTRODUCTION
7
Front Panel Controls
PAUSE (X)
Pause playback of a disc temporarily.
OPEN/CLOSE ( )
Opens or closes the disc tray.
Remote Sensor
Point the DVD receiver remote control here.
Display window
Disc Tray
Insert a disc here.
@ / 1 (POWER) indicator
Switches the DVD Receiver ON and OFF. STOP (x)
Stops playback of a disc.
PLAY (N)
To play back a disc.
Forward SKIP (
>
)
DVD: Go to NEXT chapter/track.
RADIO:
To select preset station you want.
Reverse SKIP (
.
)
DVD: Go to beginning of current chapter/track or to previous
chapter/track.
RADIO:
To select preset station you want.
VOLUME Control
Turn the knob clockwise to increase
sound level, counterclockwise to
decrease sound level.
STANDBY indicator
Lights red when the receiver
is in Standby mode (off).
FUNCTION
To select the Receiver’s source.
(FM, AM, VIDEO, TV or CD/DVD)
PHONES
To connect headphones.
MIC1, MIC2
To connect microphone.
MIC VOL (MIN/MAX)
Adjust the microphone volume.

5
CX-VX55/VX77
BASS DIGITAL
REP 1 AM FM
DISC MP3 PBC SLEEP
CD
ST MONO
TUNED
TRK
CHAP
TITLE
II
PRO LOGIC
8
Display Window Indicators
Indicates current chapter or
track number.
Repeat playback mode indicators.
Total playing time/Elapsed time/Frequency/remaining time/ Current status/
Title number/Surround mode/Volume etc. indicators.
Indicates the unit is radio mode.
SLEEP timer indication
Lights up when the DVD Receiver
tunes in a station.
CD disc inserted.
Indicates the unit is stereo mode.
Playing status.
MP3 disc inserted.
Lights up when the unit
is BASS ON mode.
VCD2.0 disc inserted.
Title indication
Indicates sound format is
DOLBY PROLOGIC II.
Indicate current
surround format.

6
CX-VX55/VX77
TV @ / 1
Switches TV ON and OFF.
@ / 1
Switches DVD Receiver ON and OFF.
DISPLAY
To display remaining time between
Chapter and title.
To check the RDS service programme
(PS).
MUTING
Momentarily silence the speaker of the
DVD Receiver.
FUNCTION
To select the Receiver’s source.
(FM, AM, VIDEO, TV or CD/DVD)
AUTO FORMAT DIRECT
Selects sound mode between A.F.D.
AUTO, PRO LOGIC, PLII MOVIE and
PLII MUSIC.
MODE
Selects sound mode between FLAT,
ROCK, POP, JAZZ, CLASSIC,NEWS
and LINK.
BASS
Switches BASS ON and OFF.
DVD DISPLAY
Accesses On-Screen display.
VOLUME (+/-)
Adjusts speaker volume.
DVD MENU
Accesses menu on a DVD disc.
RETURN
Returns the setup menu.
FM MODE
To change between MONO and
STEREO modes.
AUDIO
Selects an audio language (DVD) or an
audio channel (CD).
TUNER MENU
Memorize a radio station frequency
into the tuner.
Press to clear preset stations from the
tuner memory.
SUBTITLE
Selects a subtitle language.
TUNER/BAND
Selects the DVD Receiver’s tuner as the
listening choice. (FM and AM bands)
ANGLE
Selects a DVD camera angle if
available.
TV VOL +/–
Adjusts TV’s volume.
TV CH +/–
Selects TV’s channel.
INTRODUCTION
9
Remote Control
3
45
12
6
789
10/0
10
-/--
PAUSE
OPEN/CLOSE
Opens and closes the disc tray.
TV/VIDEO
Selects the TV’s source.
0-9 numerical buttons
Selects numbered options in a menu.
>10/ TV ENTER
Used to control TV.
Playback Control Buttons
H(PLAY)
Starts playback.
X(PAUSE)
Pause playback or recording temporarily.
x(STOP)
Stops playback.
PRESET-
Go to beginning of current chapter or
track or go to previous chapter or track.
Select programme of Tuner.
PRESET+
Go to next chapter or track.
Select programme of Tuner.
SLOW t/ TUNING-
For picture search or slow playback
backward.
To tune in the desired station.
SLOW T/TUNING+
For picture search or slow playback
forward.
To tune in the desired station.
DVD TOP MENU
Displays the disc’s Title menu, if available.
B/b/V/v(left/right/up/down)
Selects an option in the menu.
ENTER
Acknowledges menu selection.
TV
To control TVs with the Remote.
REPEAT
Repeat chapter, track, title, all
SLEEP
To place the unit in the Sleep mode.
PROGRAM
Enters to the programme edit mode or
exits from that.
DIMMER
To change the brightness of the display
window.
KARAOKE
To display the Karaoke menu
audio channel.
CLEAR
Removes a track number on the program
menu.
DVD SETUP
Accesses or removes DVD setup menu.

7
CX-VX55/VX77
AEP, UK, CET, RU MODEL
10
Rear Panel Connections
Do not touch the inner pins of the jacks on the rear
panel. Electrostatic discharge may cause permanent
damage to the unit.
AC Power Cord
Plug into the power source.
SPEAKER CONNECTORS
Connect the six supplied speakers
to these terminals.
FM ANTENNA CONNECTOR
Connect the FM antenna to this terminal.
AM LOOP ANTENNA CONNECTORS
Connect the AM Loop antenna to this terminal.
EURO AV OUTPUT (TO TV)
Connect to your TV set.
Remote Control Operation Range
Point the remote control at the remote sensor and press
the buttons.
Distance: About 6m (20ft) from the front of the
remote sensor
Angle: About 30 in each direction of the front of the
remote sensor
Remote control battery installation
Detach the battery cover on the rear of
the remote control, and insert two R03
(size AAA) batteries with and
aligned correctly.
When using the remote control, point it
at the remote sensor on the unit.
Do not mix old and new batteries.
VIDEO (AUDIO IN R/L)
Connect the audio output of an external
source (VCR, LD player, etc).
MONITOR OUT (VIDEO)
Connect to a TV with video input.

8
CX-VX55/VX77
E3, E41, AUS, SP MODEL
10
Rear Panel Connections
Do not touch the inner pins of the jacks on the rear
panel. Electrostatic discharge may cause permanent
damage to the unit.
Remote Control Operation Range
Point the remote control at the remote sensor and press
the buttons.
Distance: About 6m (20ft) from the front of the
remote sensor
Angle: About 30 in each direction of the front of the
remote sensor
Remote control battery installation
Detach the battery cover on the rear of
the remote control, and insert two R03
(size AAA) batteries with and
aligned correctly.
When using the remote control, point it
at the remote sensor on the unit.
Do not mix old and new batteries.
AC Power Cord
Plug into the power source.
SPEAKER CONNECTORS
Connect the six supplied
speakers to these terminals.
FM ANTENNA CONNECTORS
Connect the FM antenna to this terminal.
AM LOOP ANTENNA CONNECTORS
Connect the AM Loop antenna to this terminal.
VIDEO (AUDIO IN L/R)
Connect the audio output of an external
source (VCR, LD player, etc).
MONITOR OUT (VIDEO)
Connect to a TV with video input.
MONITOR S VIDEO OUT (DVD OUT)
Connect to a S Video Input on TV.
FOR DVD VIEWING ONLY.
COMPONENT VIDEO OUT (Y PB/CBPR/CR)
Connect to a TV withY PB/CBPR/CRinputs.
FOR DVD VIEWING ONLY.

9
CX-VX55/VX77
Ver. 1.1
SECTION 2
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
2-1. TOP COVER
2-1. TOP COVER
(Page 9)
2-2. FRONT PANEL ASSY
(Page 10)
SET
2-3. DVD MECHANISM DECK
(Page 10) 2-5. SMPS BOARD (Page 11)
2-7. MAIN BOARD
(Page 12)
2-8. BASE UNIT
(Page 13) 2-6. DVD BOARD (Page 12)
2-4. REAR PANEL SECTION
(Page 11)
1 two screws
3 two screw
s
2 two screws
4 top cover

10
CX-VX55/VX77
Ver. 1.1
2-3. DVD MECHANISM DECK
2-2. FRONT PANEL ASSY
1 two screws
3 PN202 (5P)
4 PN101 (23 core
)
5 PN102 (24 core)
9 claw
8 claw
0 two claws
qd front panel assy
7 claw
qs three claws
qa claw
2 shield (barrier)
6 Remove the ferrite core
attached to the power cord.
3 two screws
5 DVD mechanism deck
4
1
PDM01 (23 core)
2 PDM02 (11 core)

11
CX-VX55/VX77
Ver. 1.1
2-5. SMPS BOARD
2-4. REAR PANEL SECTION
4 screw
8 screw
9 rear panel section
5 two screws
6 two screws
7 three screws
2 PN901 (2P)
3 PN103 (12 core)
1 Pull up the two claws
pressing the power cord.
2 two screws
4 DVD board
3 two screws
1 CN903 (10P)
PDA02
PDA03

12
CX-VX55/VX77
Ver. 1.1
2-6. DVD BOARD
2-7. MAIN BOARD
1 two screws
3 SMPS board
2 two screws
CN901
CN902
4 MAIN board
1 two screw
s
2 screw
3 screw
(+BVTP 3
× 10)

13
CX-VX55/VX77
Ver. 1.1
2-8. BASE UNIT
6 two drawing screw
s
1 two drawing screws
7 two drawing screws
0 base unit
8 two rubbers
9 two rubbers
2 holder assy
3 guide
5 tray assy
4

14
CX-VX55/VX77
Ver. 1.1 SECTION 3
ELECTRICAL TROUBLESHOOTING GUIDE
3-1. AUDIO PART
1. Power check flow
INSERT
POWER CORD.
TURN ON
THE RED LED?
IS POWER ON?
CHECK POWER PLUG
AND POWER SUPPLY CIRCUIT.
DOES INITIAL
READ WORK?
DOES IT PLAY?
YES
NO
YES
YES
OK
NO
YES
NO
NO
CHECK POWER SUPPLY CIRCUIT.
CHECK LASER CIRCUIT.
CHECK TRACKING SERVO CIRCUIT.
TURN POWER ON.
CHECK FOCUS CIRCUIT.
CHECK DISC.
DOES IT OUTPUT
AUDIO?
YES
NO
CHECK AUDIOCIRCUIT.

15
CX-VX55/VX77
Ver. 1.1
POWER ON
Does it appear
DVD Error at
Does other function
name appear at FLD?
FLD?
Check
Connector(PN902)if
is normally.
Check power part
of Main B/D.
Check oscillator
of X101.
Check if IC101
PIN1 is High.
Check if IC101
PIN11 is High.
Check if IC101 PIN
17, 46, 72, 90 is high
(5V).
Check if IC101
PIN26 is High.
Replace IC101.
Does CD/DVD
appear at FLD?
Reconnect it.
Refer to SMPS.
OK.
Refer to oscillator
Circuit.
Check DVD Reset Waveform.
Check IC101 Reset Waveform.
Check 5V line.
Check Power dection Circuit.
Does LOADING
appear at FLD?
Does no Disc or
Time appear at FLD?
Check if DVD an Audio
Micom Interface is OK.
Check power.
Check DVD Module.
Check SMPS.
2. AUDIO µ.COM CIRCUIT

16
CX-VX55/VX77
Ver. 1.1
3. FRONT CIRCUIT (1/2)

17
CX-VX55/VX77
Ver. 1.1
4. FRONT CIRCUIT (2/2)

18
CX-VX55/VX77
Ver. 1.1
3-2. DVD PART
1. Power check flow
Does other function
name appear at FLD?
PDM02
PDM01
PDA02
PDA03
PDA01

19
CX-VX55/VX77
Ver. 1.1
2. Test & debug flow

20
CX-VX55/VX77
Ver. 1.1