Sony HCD-VX77 User manual

1
HCD-VX77/VX77J
SERVICE MANUAL
HCD-VX77/VX77J is the tuner, deck, CD and
amplifier section in MHC-VX77/VX77J.
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
— Continued on next page —
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM58-K2BD37A
Base Unit Type BU-K2BD37A
Optical Pick-up Type KSM-213DAP/Z-NP
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type TCM-230PWR11
CD
SECTION
TAPE DECK
SECTION
Photo: HCD-VX77
E Model
Amplifier section
The following measured at AC 120, 220, 240V
50/60 Hz
IN power output (rated) 160 + 160 watts
(6 ohms at 1 kHz, IN)
Continuous RMS power output (reference)
200 + 200 watts
(6 ohms at 1 kHz,
10% TH )
Inputs
M /VI EO (AU IO) IN: voltage 450 mV/250 mV,
(phono jacks) impedance 47 kilohms
MIC: sensitivity 1 mV,
(phone jack) impedance 10 kilohms
Outputs
VI EO OUT: max. output level 1 Vp-p,
(Phono jack) unbalanced, Sync
negative, load impedance
75 ohms
S-VI EO OUT: Y: 1 Vp-p, unbalanced
(4 pin/mini- IN jack) Sync negative
C: 0.286 Vp-p
load impedence 75 ohms
PHONES: accepts headphones of 8
(stereo mini jack) ohms or more
FRONT SPEAKER: accepts impedance of 6 to
16 ohms
SURROUN SPEAKER: accepts impedance of
16 ohms
VIDEO CD/CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780nm)
Emission duration:
continuous
Laser output Max. 44.6
µ W*
*This output is the value
measured at a distance of
200 mm from the
objective lens surface on
the Optical Pick-up Block
with 7 mm aperture.
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
ynamic range More than 90 dB
Video color system format
NTSC, PAL
C OPTICAL IGITAL OUT
(Square optical connector jack, rear panel)
Wavelength 660 nm
Output Level –18 dBm
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 40 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Middle Eastern models: 531 – 1,602 kHz
(with the interval set at 9
kHz)
Other models: 531 – 1,602 kHz
(with the interval set at 9
kHz)
530 – 1,710 kHz
(with the interval set at 10
kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate fre
q
uenc
y
450 kHz
9-929-223-12
2001H0200-1
© 2001.8
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group
Ver 1.1 2001.08

2
General
Power requirements
Thailand models: 220 V AC, 50/60 Hz
Other models: 20 V, 220 V or 230 - 240
V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption
250 watts
Dimensions (w/h/d)
Approx. 280 x 360 x 425
mm ( x 43/6 x 6 /6
in.)
Mass:
Approx. 9.5 kg
(2 lb.)
Supplied accessories: AM loop antenna ( )
Remote commander ( )
Batteries (2)
Video cable ( )
FM lead antenna ( )
Front speaker pads (8)
Design and specifications are subject to change
without notice.
TABLE OF CONTENTS
1. SERVICE NOTE ······························································· 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
4. TEST MODE ···································································· 12
5. MECHANICAL ADJUSTMENTS ····························· 17
6. ELECTRICAL ADJUSTMENTS ······························· 17
7. DIAGRAMS
7-1. Circuit Board Location ····················································· 23
7-2. Block Diagrams – TUNER/CD Section – ························ 25
7-3. Printed Wiring Board – BD Section – ······························ 28
7-4. Schematic Diagram – BD Section – ································· 29
7-5. Printed Wiring Board – Video Section – ·························· 30
7-6. Schematic Diagram – Video (1/3) Section – ···················· 31
7-7. Schematic Diagram – Video (2/3) Section – ···················· 32
7-8. Schematic Diagram – Video (3/3) Section – ···················· 33
7-9. Printed Wiring Board – Main Section – ··························· 34
7-10. Schematic Diagram – Main (1/3) Section – ····················· 35
7-11. Schematic Diagram – Main (2/3) Section – ····················· 36
7-12. Schematic Diagram – Main (3/3) Section – ····················· 37
7-13. Printed Wiring Board – Power AMP Section – ················ 38
7-14. Schematic Diagram – Power AMP Section – ··················· 39
7-15. Printed Wiring Board – Panel Section – ··························· 40
7-16. Schematic Diagram – Panel Section – ····························· 41
7-17. Printed Wiring Board – Leaf SW Section – ····················· 42
7-18. Schematic Diagram – Leaf SW Section – ························ 43
7-19. Printed Wiring Board – Driver Section – ························· 44
7-20. Schematic Diagram – Driver Section – ···························· 45
7-21. Printed Wiring Board – Trans Section – ··························· 46
7-22. Schematic Diagram – Trans Section – ····························· 47
7-23. IC Pin Function ································································ 48
7-24. IC Block Diagrams ··························································· 57
8. EXPLODED VIEWS
8-1. Main Section ····································································· 61
8-2. Panel Section ···································································· 62
8-3. Main Board Section ·························································· 63
8-4. Tape Mechanism Deck Section-1 ····································· 64
8-5. Tape Mechanism Deck Section-2 ····································· 65
8-6. CD Mechanism Deck Section (CDM58-K2BD37A) ······· 66
8-7. Base Unit Section (BU-K2BD37A) ································· 67
9. ELECTRICAL PARTS LIST ······································· 68
Ver 1.1 2001.08

3
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
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.
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 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.
MODEL IDENTIFICATION
— BACK PANEL —
PARTS No.
• Abbreviation
TH : Thai model
MODEL
TH
EXCEPT TH
PARTS No.
4-225-040-6s
4-227-061-1s

4
SECTION 1
SERVICE NOTE
Screw hole
Attach the panel board with
six screws (
+BVTP 2.6 × 8 )
after the board is removed once.
Do not tighten the screws excessively.
1 Cut the eleven melted-connection points with a cutting plier.
Note for installing the panel board
2 Panel board
Hot melt
SELF-DIAGNOSIS
This model has the self-diagnosis function for the VIDEO andAUDIO decoder sections.
Connecting to the LED between TP522 and TP523 on the VIDEO BOARD.
Immediately after the power on, the self-diagnosis function searches each operation of IC’s around the mechanism control microcomputer
(IC701). and TP5
The results can be checked by LED of the VIDEO board.
Oscilloscope (Waveform) Symptom
No error
MPEG decoder (IC505)
error
MPEG decoder (IC505)
or
DRAM (IC507) error
[VIDEO BOARD] (SIDE A)
H
L
Li
g
ht
2 time blinkin
g
H
L
H
L
3 time blinkin
g
TP523 TP522
LED
IC505
100 91
33 64
90
65
1
32

5
SECTION 2
GENERAL
1DISC SKIP EX-CHANGE button
2DISC 1 button and indicator
3DISC 2 button and indicator
4DISC 3 button and indicator
5ZOPEN/CLOSE button
6PREV button
7NEXT button
8RETURN button
9EDIT, TUNER MOMERY button
q; PLAY MODE, STEREO/MONO button
qa REPEAT button
qs DIRECTION button
qd VOLUME knob
qf PHONES jack
qg ENTER button
qh REC PAUSE/START button and indicator
qj CD SYNC HI-DUB button
qk KARAOKE PON/MPX button
ql MIC1, MIC2 jack
w; MIC LEVEL knob
wa ECHO LEVEL knob
ws EQ EDIT button
wd SPECTRUM button
wf DISPLAY button
wg ?/1 button and indicator
wh Function indicator
wj TUNER/BAND button
wk CINEMA SPACE button
wl MD (VIDEO) button
e; gG/SELECT button
ea >+ button
es Xbutton
ed – .button
ef xbutton
eg V-GROOVE button and indicator
eh PICTURE EFFECT button
ej CURSOL button and indicator
ek GROOVE button
el TAPE A/B button
r; CD button
Photo: HCD-VX77
12345
6
7
qd
qf
qgqh
el
ed
r;
ef
wh
wj
wk
ea
8
qa
qs
9
q;
es
ej
qk qj
ws
wd
wf
wg
w;
ql
wa
ek
eg
eh
wl
e;

6
This section is extracted from
instruction manual.
7
Inserting two size AA (R6)
batteries into the remote
Using the remote
You can use the shaded buttons shown below
to operate a Sony TV.
To Press
Turn the TV on or off TV ?/1
Switch the TV's TV/VIDEO.
video input
hange the TV TV H +/–.
channels
Adjusts the volume TV VOL +/–.
of the TV speaker(s)
Tip
With normal use, the batteries should last for about
six months. When the remote no longer operates
the system, replace both batteries with new ones.
Note
If you do not use the remote for a long period of
time, remove the batteries to avoid possible damage
from battery leakage.
When carrying this system
Do the following to protect the D
mechanism.
1Make sure that all discs are removed from
the unit.
2Hold down D and then press ?/1 so that
“LO K” appears in the display.
3Unplug the A power cord.
1
Press LO K/TIMER SET.
The hour indication flashes.
2
Press . or > repeatedly to set
the hour.
Step 2: Setting the
time
You must set the time before using the timer
functions.
continued
NX x
xMm>.
nN
O
v V
bB
X
1
3,5
2,4
TV ?/1
TV VOL +/
TV CH +/
TV/VIDEO
8
1Press TUNER/BAND repeatedly
until the band you want appears in
the display.
Every time you press this button, the
band changes as follows:
FM y AM
Step 3:Presetting
radio stations
You can preset 20 stations for FM and 10
stations for AM.
?/1
(Power)
3Press ENTER.
The minute indication flashes.
4Press . or > repeatedly to set
the minute.
5Press ENTER.
The clock starts working.
Tip
If you’ve made a mistake, start over from step 1.
To change the time
The previous explanation shows you how to set the
time while the power is off. To change the time
while the power is on, do the following:
1Press LO K/TIMER SET.
2Press . or > repeatedly to select
SET LO K.
3Press ENTER.
4Perform steps 2 through 5 above.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
Step 2: Setting the time
(continued)
SHUTTLE
42
13

7
SECTION 3
DISASSEMBY
Note : Follow the disassembly procedure in the numerical order given.
Side panel R
Claw
4
q;
8
Upper case (Top)
Side panel L
5 Two screws (Case)
7 Two screws
(+BVTP 3 × 10)
1 Two screws (Case)
9 Two screws (+BVTP 3 × 10)
3 Two screws
(+BVTP 3 × 10)
6 Screw (Case)
2 Screw (Case)
2 Pull-out the disc tray.
1 Turn the pulley to the direction of arrow.
pulley
Loading panel assy
Front panel side
CD mechanism deck (CDM58)
3
3-1. UPPER CASE (TOP)
3-2. LOADING PANEL ASSY

8
7
CD mechanism deck (CDM58)
Front panel section
3 Connector (CN2)
8 Connector (CN201)
9 Connector (CN202)
2 Connector (CN1)
Connector
(CN601)
1 Flat type wire (CN304)
6 Three screws (+BVTT 3 × 6)
5 Screw (+BVTP 3 × 10)
4 Screw (+BVTP 3 × 10)
0Two screws (+BVTP 3 × 10)
qaTwo screws (+BVTP 2.6 × 8
)
qs
6 Tape mechanism deck
5 Five screws (+BVTP 2.6 × 8)
1 Screw (+BVTP 2.6 × 8
)
2 Bracket (Heart cam R)
4 Bracket (Heart cam L)
3 Screw (+BVTP 2.6 × 8)
3-3. FRONT PANEL SECTION
3-4. TAPE MECHANISM DECK

9
qs Cut the eleven melted-connection points with a cutting plier.
Note: When attching the panel board,
refer to "Service Note" on page 4.
qf Panel board
qa CD Switch boar
d
1 Knob (Volume)
8
5
FR knob
4 Bracket (FR)
qd Five claws
0 Three claws
9 Three screws
(+BVTP 2.6
× 8)
3 Two bosses & four pins
6 Spring
2 Two screws
(+BVTP 2.6
× 8)
7 Knob(MIC)
8 Two screws
(+BVTT 4
× 8)
2 Six screws
(+BVTP 3
× 10
)
1 Two screws
(+BVTP 3
× 10)
4 Panel, back
7 Two screws (+BVTT 4 × 8)
0 Trans board
9 Trans
5 Connector (CN975)
6 Connector (CN977)
3 Connector (CN891)
3-5. PANEL BOARD
3-6. TRANS BOARD

10
4 Three screws (+BVTP 3 × 8)
6 Two screws (+BVTP 3 × 8)
7 Heat sink
3 Two screws (+BVTP 3 × 16)
1 Two screws (+BVTP 3 × 8
)
2 Main board
Connector(CN502)
Connector
(CN503)
5Power AMP board
6 Screw (+PS 2.6 × 5)
3 Screw (+PS 2.6 × 5)
2Leaf SW board
1 Five claws
4 Head (A) board
5 Head (B) board
7 Remove the four solderings.
3-7. MAIN BOARD AND AMP BOARD
3-8. LEAF SW BOARD, HEAD (A) BOARD AND HEAD (B) BOARD