Sony HCDVX-777 Service manual
HCD-VX777
SERVICE MANUAL
Ver 1.0 2001.04
HCD-VX777 is the tuner, deck, CD and amplifier
section in MHC-VX777.
Model Name Using Similar Mechanism HCD-DX70
CD
SECTION
TAPE DECK
SECTION
CD Mechanism Type CDM58E-30BD61A
Base Unit Type BU-30BD61A
Optical Pick-up Type A-MAX.3
Model Name Using Similar Mechanism NEW
T ape Transport Mechanism T ype TCM-230AWR41/MWR41
E Model
VIDEO CD/CD player section
System Compact disc and digital audio system
Laser Semiconductor laser (λ=780nm)
Laser Output Max. 44.6 µW*
*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)
Wave length 780 — 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
Video color system format
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wave length 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
(DOLBY NR OFF*) Sony TYPE I cassette
40 — 14,000 Hz (–3 dB), using
Sony TYPE II cassette*
Wow and flutter –0.15% W.Peak (IEC)
0.1% W .RMS (NAB)
–0.2% W .Peak (DIN)
* HCD-VX777 only
SPECIFICATIONS
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
Latin American models: 530 — 1,710 kHz
PAL (with the interval set at 10 kHz)
531 — 1,710 kHz
(with the interval set at 9 kHz)
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 frequency 450 kHz
— Continued on next page —
9-873-850-11
2001D0900-1
© 2001.4
COMPACT DISC DECK RECEIVER
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group
HCD-VX777
General
Power requirements
Australian models: 230 — 240 V AC,
Mexican models: 120 V AC, 60 Hz
Thailand models: 220 V AC, 50/60 Hz
Other models: 120 V, 220 V or
Power consumption
HCD-VX777 250 watts
Dimensions (w/h/d)
HCD-VX777 Approx. 280 x 360 x 425 mm
Mass :
HCD-VX777 Approx. 11 kg
Supplied accessories: AM loop antenna (1)
Design and specifications are subject to change without notice.
50/60 Hz
230 — 240 V AC,
50/60 Hz
Adjustable with voltage
selector
Remote commander (1)
Batteries (2)
Video cable (1)
FM lead antenna (1)
Front speaker pads (8)
(MHC-VX777 only)
TABLE OF CONTENTS
1. GENERAL ·········································································· 4
2. DISASSEMBLY
2-1. Case (Top) ·········································································· 5
2-2. Loading PANEL ································································· 6
2-3. Front PANEL Section ·························································6
2-4. Tape Mechanism Deck ······················································· 7
2-5. CD SW Board, PANEL Board, Pad Switch Board·············7
2-6. MAIN Trans Board·····························································8
2-7. MAIN Board, Power Board················································8
2-8. LEAF SW Board, Head (A) Board, Head (B) Board ········· 9
2-9. Base Unit ············································································ 9
2-10. DRIVER Board, Motor Board, CD Sensor Board and
VIDEO Board··································································· 10
3. TEST MODE···································································· 11
4. MECHANICAL ADJUSTMENTS ····························· 13
5. ELECTRICAL ADJUSTMENTS ······························· 13
6. DIAGRAMS
6-1. Circuit Board Location ····················································· 19
6-2. Block Diagrams ································································ 21
6-3. Schematic Diagram – BD Section –································· 24
6-4. Printed Wiring Board – BD Section – ······························ 25
6-5. Printed Wiring Board – VIDEO Section – ······················· 26
6-6. Schematic Diagram – VIDEO (1/3) Section – ················· 27
6-7. Schematic Diagram – VIDEO (2/3) Section – ················· 28
6-8. Schematic Diagram – VIDEO (3/3) Section – ················· 29
6-9. Printed Wiring Boards – MAIN Section – ······················· 30
6-10. Schematic Diagram – MAIN (1/4) Section – ··················· 31
6-11. Schematic Diagram – MAIN (2/4) Section – ··················· 32
6-12. Schematic Diagram – MAIN (3/4) Section – ··················· 33
6-13. Schematic Diagram – MAIN (4/4) Section – ··················· 34
6-14. Schematic Diagram – SWITCH Section – ······················· 35
6-15. Printed Wiring Boards – SWITCH Section –··················· 35
6-16. Printed Wiring Boards – POWER AMP Section –··········· 36
6-17. Schematic Diagram – POWER AMP Section – ··············· 37
6-18. Printed Wiring Boards – PANEL Section –······················ 38
6-19. Schematic Diagram – PANEL Section – ·························· 39
6-20. Printed Wiring Boards – CD SW/PAD Section – ············· 40
6-21. Schematic Diagram – CD SW/PAD Section – ················· 41
6-22. Printed Wiring Boards – LEAF SW Section – ················· 42
6-23. Schematic Diagram – LEAF SW Section – ····················· 43
6-24. Printed Wiring Boards – DRIVER Section – ··················· 44
6-25. Schematic Diagrams – DRIVER Section – ······················ 45
6-26. Printed Wiring Boards – TRANS Section – ····················· 46
6-27. Schematic Diagram – TRANS Section – ························· 47
6-28. IC Pin Functions ······························································· 48
6-29. IC Block Diagrams ··························································· 57
7. EXPLODED VIEWS
7-1. MAIN Section ·································································· 61
7-2. Front PANEL Section ······················································· 62
7-3. Chassis Section································································· 63
7-4. Tape Mechanism Section-1 (TCM-230MWR41)············· 64
7-5. Tape Mechanism Section-2 (TCM-230AWR41)·············· 65
7-6. CD Mechanism Deck Section (CDM58E-30BD61A) ····· 66
7-7. Base Unit Section (BU-30BD61A) ·································· 67
8. ELECTRICAL PARTS LIST······································· 68
2
HCD-VX777
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 pickup 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.
SETTING THE TIME
1 Turn on the system.
2 Press CLOCK/TIMER SET on the
remote.
When you set the time for the first time,
proceed to step 5.
3 Press cursor V/v repeatedly to select
CLOCK SET.
4 Press ENTER.
5 Press cursor V/v repeatedly to set the
hour.
6
Press ENTER.
7 Press cursor V/v repeatedly to set the
minute.
8 Press ENTER.
The clock starts working.
If you have made a mistake or want to change the
time, start over from step 2.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
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.
MODEL IDENTIFICATION
— BACK PANEL —
PARTS No.
This section is extracted
from instruction manual.
MODEL
E, EA, SP, IA models
TH model
• Abbreviation
EA : Saudi Arabia model
IA : Indonesian model
SP : Singapore model
TH : Thai model
PARTS No.
4-232-028-1s
4-232-028-5s
3
HCD-VX777
Front Panel
SECTION 1
GENERAL
1 2 3 4 56
ql
qk
qj
qh
qg
qf
qd
7
9
qa
qs
8
q;
rs
r;
rf
rd
ra
w; wa ws wd wf wg
wh
wj
wk
elek eh eg edea wl
e;ej ef es
Location of Parts and Controls
1 @/1 (POWER) button and indicator
2 DISC 1 button and indicator
3 DISC 2 button and indicator
4 DISC 3 button and indicator
5 DISC SKIP EX-CHANGE button
6 CD (OPEN) button
7 CD button and indicator
8 TUNER/BAND button and indicator
9 TAPE A/B button and indicator
q; MD (VIDEO) button and indicator
qa VOLUME knob
qs PHONES jack
qd MIC 2 jack
qf MIC 1 jack
qg MIC LEVEL knob
qh ECHO level knob
qj SURROUND speaker indicator
qk GAME INPUT (VIDEO, AUDIO L/R) jack
ql GAME button and indicator
w; DISPLAY button
wa SPECTRUM button
ws EDIT (DIRECTION) button
wd REPEAT (FM MODE/DOLBY NR) button
wf PLAY MODE (TUNER MEMORY) button
wg Remote sensor
wh MOVIE EQ button
wj ENTER button and indicator
wk P FILE button
wl M/+ button
e; REC PAUSE/START button and indicator
ea > button
es CD SYNC HI-DUB button
ed X button
ef SURROUND button
eg bB button
eh x button
ej GROO VE button
ek . button
el m/– button
r; b/v/B/V button
ra GAME EQ button
rs KARAOKE PON button
rd EFFECT ON/OFF button
rf MUSIC EQ button
4
SECTION 2
DISASSEMBLY
• The equipment can be removed using the following procedure.
Set Case (Top) Loading Panel Front Panel Section
HCD-VX777
Tape Mechanism Deck
Head (A) Board, Head (B) Board And SW Board
CD SW Board, Panel Board And PAD Switch Board
Main Trans Board
Main Board And Power Board
Base Unit
Driver Board, Motor Board, CD Sensor Board And Video Board
Note : Follow the disassembly procedure in the n umerical order giv en.
2-1. CASE (TOP)
qs
qd
case (top)
two claws
6
two screws (case 3 TP2)
8
two screws
(+BVTP 3
×
10)
qa
two screws (+BVTP 3
two claws
×
10)
0
7
screw (case 3 TP2)
side panel (L)
9
5
4
2
screw (case 3 TP2)
side panel (R)
3
two screws
(+BVTP 3
1
two screws (case 3 TP2)
×
10)
5
HCD-VX777
2-2. LOADING PANEL
CD mechanism deck (CDM58)
1
Turn the pulley to the direction of arrow.
Front panel side
4
Pull-out the disc tray.
pulley
2-3. FRONT PANEL SECTION
qg
CD mechanism deck (CDM58)
2
Pull-out the disc tray.
4
connector
(CN607)
3
0
connector
(CN781)
qd
screw (+BVTP 3
×
10)
6
screw
(+BVTP 3
×
10)
8
qf
1
flat type wire (CN304)
5
screw (+BVTP 3
2
9
front panel section
×
10)
connector (CN1)
3
connector (CN2)
connector
(CN401)
qa
flat type wire
(CN201)
qs
connector
(CN202)
7
6
three screws (+BVTT 3
×
8)
2-4. TAPE MECHANISM DECK
1
five screws (+BVTP 2.6
2
Tape mechanism deck
HCD-VX777
×
8)
2-5. CD SW BOARD, PANEL BOARD, PAD SWITCH BOARD
2
fore claws
qs
8
knob vol
9
claw
nut
6
0
three screws
(+BVTP 2.6
qd
PAD SWITCH board
two claws
5
three screws
(+BVTP 2.6
×
8)
3
CD SW board
7
PANEL board
×
8)
1
four screws
(+BVTP 2.6
4
four screws
(+BVTP 2.6
×
×
8)
8)
qa
five screws
(+BVTP 2.6
×
8)
7
HCD-VX777
2-6. MAIN TRANS BOARD
5
connector (CN973)
qd
MAIN TRANS board
6
connector (CN977)
0
two screws (+BVTT 4
×
qs
8)
trans
4
connector (CN403)
1
screw
(+BVTP 3
qa
two screws
(+BVTT 4
×
×
9
panel, back
8
five screws
(+BVTP 3
8)
8)
7
three screws
(+BVTP 3
2
SENSOR board
×
×
10)
10)
2-7. MAIN BOARD, POWER BOARD
4
three screws (+BVTP 3
3
two screws (+BVTP 3
5POWER
×
board
16)
×
3
connector (CN891)
8)
7
heat sink
6
two screws (+BVTP 3
connector(CN502)
×
8)
connector
(CN503)
2
MAIN board
1
two screws (+BVTP 3
×
8)
8
2-8. LEAF SW BOARD, HEAD (A) BOARD, HEAD (B) BOARD
1
five claws
2
LEAF SW board
3
Remove the four solderings.
HCD-VX777
2-9. BASE UNIT
5
HEAD (A) board
4
screw (+PTT 2
ground point
×
4),
7
HEAD (B) board
6
screw (+PTT 2
ground point
×
4),
7
two springs (insulator),
coil
6
two stoppers (BU)
8
two insulators
(BU-30)
4
two screws
(+BVTP 2.6
×
5
2
screw (DIA. 12), floating
0
two insulators (BU-30)
9
two springs (insulator), coil
1
flat type wire (CN101)
3
two screws (+PTPWH M2.6), floating
8)
qa
base unit
9
HCD-VX777
d
2-10. DRIVER BOARD, MOTOR BOARD, CD SENSOR BOARD AND VIDEO BOARD
0
qa
tray
screw (+PTPWH 2.6
qs
screw (+BVTP 2.6
4
DRIVER board
7
×
8)
MOTOR board
×
8)
5
two screws (+BVTP 2.6
8
flat type wire (CN721)
6
Remove the two solderings of motor.
9
connector(CN722)
qd
SENSOR board
×
8)
3
screw (+BVTP 2.6
×
8)
1
two screws (+BVTP 2.6
×
2
VIDEO boar
8)
10
SECTION 3
TEST MODE
HCD-VX777
[Cold Reset]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Press three buttons x , ENTER , and ?/1 simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously ,
and the set is reset.
[Hot Reset]
• This mode resets the set with the preset data kept stored in the
memory. The hot reset mode functions same as if the power
cord is plugged in and out.
Procedure:
1. Press three buttons x , ENTER , and DISPLAY
simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously ,
and the set is reset.
[Tuner Step Change]
• A step of AM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND
button to select the BAND “AM”.
3. Press ?/1 button to turn the set OFF.
4. Press ENTER and ?/1 buttons simultaneously, and the display
of fluorescent indicator tube changes to “AM 9 k STEP” or
“AM 10 k STEP”, and thus the channel step is changed over.
[Function Change Mode]
• Select either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Hold down MD (VIDEO) button then press ?/1 button , and
release ?/1 button first in order not to switch off the set
immediately.
The another function of the previous function is selected , the
input level is also changed and displayed “ MD ” or “VIDEO”.
[GC Test Mode]
• This mode is used to check the software version, FL tube, LED,
keyboard and VACS.
Procedure:
1. Press three buttons x , ENTER , and DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,
press DISC 1 . The model number and destination are displayed.
4. Each time DISC 1 is pressed, the display changes starting
from MC version, GC version, CD version, CDDM version,
CDMA version, CDMB, version BDA version, BDB version,
ST version, TA version, TM version and TC version in this
order, and returns to the model number and destination display .
5. When DISC 3 is pressed while the version numbers are being
displayed except model number and destination, year, month
and day of the software creation appear. When DISC 3 is
pressed again, the display returns to the software version display.
When DISC 1 is pressed while year, month and day of the
software creation are being displayed, the year, month and day
of creation of the software versions are displayed in the same
order of version display.
6. Press DISC 2 button, and the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“K0 V0”. Each time a button is pressed, “KEY” value increases.
However, once a button is pressed, it is no longer taken into
account.
“VOL” value increases like 1, 2, 3 ... if rotating VOLUME
knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
8. Also when DISC 3 is pressed after lighting of all LEDs and FL
tubes, value of VACS appears.
9. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
[MC Test Mode]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner , and Tape.
Procedure:
* To enter MC Test Mode
1. Press the ?/1 button to turn on the set.
2. Press the three buttons of x , ENTER and DISC 3
simultaneously.
3. The messages MUSIC, MOVIE, GAME and P FILE flash on
the FL display tube.
The input FUNCTION is Changed to VIDEO.
* Check of Amplifier
1. When f (CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ MAX” appears.
2. When F (CURSOR DOWN) button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.
3. When g (CURSOR LEFT) or G (CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
4. When the VOLUME control knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears for two seconds, then the
display returns to the original display.
5. When the VOLUME control knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and
a message “VOLUME MIN” appears for two seconds, then the
display returns to the original display.
* Check of clock frequency
1. To check the frequency of clock used to run the time in the unit,
the clock output is available at pin 39 (IC 501, MASTER
CONTROL) only during MC test mode.
2. The frequency is 32.768 kHz or so.
* Tuner function
1. In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory. (It means that the
memory is cleared.)
2. The minimum, center and maximum frequency of each band is
set then.
11
HCD-VX777
k
k
* T ape function
1. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
When CD SYNC/HI-DUB button is pressed during Rec in
function, ALC is turned on.
2. When x button is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound, tape is rewound using m
button, tape is stops at around the record-starting position and
playback of the recorded portion of the tape is started. If P AUSE
is inserted even once during recording, tape is rewound to the
position around the PAUSE position and is played back.
3. When CD SYNC / HI-DUB button is pressed during playback
of Deck B, either normal speed or high speed can be selected
by this button.
* AMS Test Mode
1. Set TAPE function
2. Select the desired loop by pressing the PLAY MODE button.
Insert a test tape AMS-110A or AMS-120 to Deck A.
3. Press the SPECTRUM button to enter the AMS test mode.
4. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
5. Then the REW AMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
6. When the check is complete, a message of either OK or NG
appears.
* To return to normal mode again.
1. When you want to exit this mode, press the ?/1 button.
2. The cold reset is enforced at the same time.
[VACS ON/OFF Mode]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
Press the ENTER and SPECTRUM buttons simultaneously. The
message “VACS OFF” or “VACS ON” appears.
[CD Aging Mode]
Procedure:
1. Short SL501 by soldering.
2. Turn on the main power. Set a disc on the DISC1 tray. Select
CD.
3. Press the SELECT/gG button. The aging mode starts.
4. Aging status appears on the monitor screen.
TOC reading
How to exit the CD aging mode:
1. Press the ?/1 and turn off the main power.
2. Remove soldering from SL501.
[Function Change Mode]
Select either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Press the two buttons ENTER and ?/1 at the same time.
The main power is turned on and the other function of the
previous function is selected and displayed. “MD” or
“VIDEO”.
[VIDEO CD Color-bars Mode]
On this mode, the data of the color-bars signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC502) for the video CD signal check. When
measurement of the voltage and waveform on the VIDEO board,
perform it in this mode.
For reference, the color-bars signal can be observed at CN301 pin2
using an oscilloscope.
Procedure:
1. Short the both ends of the land of SL503 of the VIDEO board.
2. Turn the power on. Press the CD button to select CD.
3. The color-bars appears when the CD is in stop status, and it
disappears when the CD goes in play status.
4. After measuring, remove the lead wire connected.VIDEO board
(SIDE B)
[CD Servo ON/OFF Mode]
Procedure:
1. Short SL502 on the VIDEO board by soldering.
2. Turn on the main power. Set a disc on the DISC1 tray. Select
CD.
3. Press the hH button to play back CD.
4. When the > + button is pressed, 100 track jump is executed.
5. Also, every pressing of the PLAY MODE button triggers
between ON and OFF of TRACKING SERVO and SLED
SERVO.
How to quit the CD servo ON/OFF mode:
1. Press the ?/1 button to turn off the main power.
2. Remove soldering from SL502.
Last track is played bac
First track is played bac
OPEN
CLOSE
Monitor Display
1st line OPEN/CLOSE/CD PLAY display
2nd line DISC1/DISC1-15/DISC1-1/TIME display
4th line COUNT : 1 display
5th line TOTAL ERR : 00 display
6th line JITTER FF display
3rd line AGING
12
[ VIDEO BOARD ] (SIDE A)
J301
CN501
HCD-VX777
1 2 3
CN301
SL503
SL502
SL501
CHECK LED
CN502
CN503
13
HCD-VX777
r
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL 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
supply voltage unless otherwise noted.
Torque Measurement
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
100 g or more
(3.53 oz or more)
9.80 N • m
100 g or more
(3.53 oz or more)
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply 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 RCH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
Record/Playback Head Azimuth Adjustment
0 dB=0.775 V
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
set
main board
CN301
Pin
3
(L-CH)
1
(R-CH)
Pin
main board
CN301
2
(GND)
Pin
level mete
+
–
14
HCD-VX777
(
)
(
)
r
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 1dB of peak.
Output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
Screw
position
L-CH
peak
Screw
position
R-CH
peak
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN301
set
R-CH
waveform of oscilloscope
in phase 45° 90° 135° 180°
pin 3
pin 2
L
R
pin 1
good
oscilloscope
V
wrong
H
Tape Speed Adjustment DECK B
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
CD SYNC HI-DUB button.
Procedure:
1. Turn the power switch on.
2. Press the x button, ENTER button and DISC 3 button
simultaneously.
(The “TEST MODE” on the fluorescent indicator tube display
while in the test mode.)
To exit from the test mode, press the ?/1 button.
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
main board
CN301 (Pin 3 : L-CH)
frequency counter
+
–
Pin 1 : R-CH
1. Insert the WS-48B into the deck B.
2. Press the gG button on the deck B.
3. Press the CD SYNC HI-DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 30 Hz.
5. Press the CD SYNC HI-DUB button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 15 Hz.
Adjustment Location: LEAF SW board
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback
test tape
P-4-L300J
(315 Hz, 0 dB)
set
main board
CN301
level mete
+
–
Pin 3 : L-CH
Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.
Adjustment Level:
CN301 PB level: 334.4 to 748.7 mV (–7.3 to –0.3 dB) level
difference between the channels: within ±0.5 dB
Adjustment Location: MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
forward
reverse
15
HCD-VX777
(
)
(
)
REC Bias Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotette
of shuttle knob then rewind to recording start position.)
1. Press MD/VIDEO button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
4. Mode: Record
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz
AF OSC
attenuator
50 mV (–23.8 dB)
600 Ω
set
blank tape
CN-123
4. Mode: Record
MD/VIDEO (AUDIO) IN
AF OSC
315 Hz, 50 mV (–23.8 dB)
600 Ω
attenuator
blank tape
CS-123
set
5. Mode: Playback
recorded
portion
set
CN301 (Pin 3 : L-CH)
level meter
+
–
Pin 1 : R-CH
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and R V351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
5. Mode: Playback
recorded
portion
set
CN301 (Pin 3 : L-CH)
level meter
+
–
Pin 1 : R-CH
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV304
(L-CH) and RV354 (R-CH) on the A UDIO board to repeat steps
4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ±1.0 dB
Adjustment Location: MAIN board
REC Level Adjustment
DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotate
of shuttle knob then rewind to recording start position.)
[MAIN BOARD] (Component Side)
T11
RV11
PB LEVEL (L)
(A)
PB LEVEL (L)
(B)
REC LEVEL (R)
(B)
REC LEVEL (L)
[LEAF SW BOARD] (Component Side)
TAPE SPEED
(NORMAL) (HIGH)
RV1002
RV1001
REC LEVEL (L)
(A)
(B)
CN301
3
1
RV351
CN1001
RV301
RV352
RV302
RV353
RV303
CN303
RV304
REC LEVEL (R)
RV354
(A)
CN304
1. Press MD/VIDEO button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
16
HCD-VX777
symmetry
S-curve waveform
within 2 ±0.5Vp-p
A
B
FM Tuned Level Adjustment
FM RF SSG
75 Ω coaxial
set
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75 W open)
FM ANTENNA terminal
(TM1)
Procedure:
1. Supply a 28 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV611 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
Null Adjustment
FM RF SSG
75 Ω coaxial
set
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75 W open)
FM ANTENNA terminal
(TM1)
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use LUV-P01 (4-999-032-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S-Curve Check
Oscilloscope
BD board
TP(FEO)
TP(DVC)
Procedure :
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (DVC ( 1.65 V) by lead
wire.
3. Turn Power switch on.
4. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak lev el
within 2 ±0.5 Vp-p.
Procedure:
1. Supply a 60 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Measure voltage between pin 21 of IC 601. Adjust T11 ubtil
the voltage becomes 0 V.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] Component side
NULL
T11
RV11
FM TUNED LEVEL
CN301
3
RV351
1
RV301
RV353
RV303
RV304
RV352
RV302
CN303
CN304
RV354
6. After check, remove the lead wire connected in step 2.
Note : • Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
oscilloscope
BD board
TP(RF)
TP(DVC)
Procedure :
1. Connect oscilloscope to TP (RFDC) and (RFAC).
2. Turned Power switch on.
3. Load a disc (LUV-P01) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
17
HCD-VX777
r
Note: Clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65 ± 0.15Vp-p (RFDC)
1.1 ± 0.4Vp-p (RFAC)
E-F Balance (1 Track jump) Check
oscilloscope
BD board
TP (TEO)
TP (DVC)
+
–
Procedure:
1. Connect oscilloscope to TP (TEO) and TP (DVC) board.
2. Turned Power switch on.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the bB button. (Becomes the 1track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
Center of
waveform
B
DVC
A (DC voltage)
VIDEO SECTION
Frequency adjustment
1. Connect the frequency counter to check point of the VIDEO
board.
2. Adjust CT503 of the VIDEO board so that the frequency
counter read 27MHz ± 80Hz at STOP condition.
frequency counte
VIDEO board
(27 MHz)
Adjustment Location :
[ VIDEO BOARD ] – SIDE A –
SL502
SL501
TEST MODE
SL503
CT503
VIDEO
FREQUENCY
(27MHz)
(GND)
+
–
IC505
IC507
level=1.0±0.5Vp-p
Symmetry
6. Adjust RV101 so that A (DC voltage) becomes 0.
Checking Location:
[BD BOARD]
TP
(CE)
TP
(RFDC)
IC103
IC101
TP
(RFAC)
TP
(XPCK)
[ VIDEO BOARD ] – SIDE B –
SL503
TEST
MODE
SL502
SL501
IC502
18
d
d
SECTION 6
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING BO ARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each bloc k.)
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
f
•
• C : panel designation.
Note:
The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
• Voltages are tak en with a V OM (Input impedance 10 MΩ).
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
• Abbreviation
: internal component.
under no-signal (detuned) conditions.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal production tolerances.
F : FM
f : AM
E : PB (DECK A)
d : PB (DECK B)
G : REC (DECK B)
J : CD
c : digital out
m : CHROMA
n : Y
: VIDEO
EA : Saudi Arabia model
IA : Indonesian model
SP : Singapore model
TH : Thai model
4
W or less unless otherwise
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
• Indication of transistor.
C
These are omitted.
Q
B
CE
These are omitted.
Q
B
HCD-VX777
6-1. CIRCUIT BOARD LOCATION
MAIN TRANS board
CD SW board
E
PANEL board
PAD SWITCH board
MOTOR board
SENSOR board
SW board
SENSOR board
SUB TRANS boar
MAIN board
POWER board
DRIVER board
BD board
VIDEO boar
HEAD (A) board
HEAD (B) board
LEAF SW board
1919
HCD-VX777
• WA VEFORMS
– BD BOARD –
1
IC101 us (XTAO)
CD PLAY MODE
16.9344MHz
2
IC101 t; (RFAC)
CD PLAY MODE
400nsec/div
3
CD PLAY MODE
4.0Vp-p
4
CD PLAY MODE
1.2Vp-p
IC101 ra (TE)
IC101 el (FE)
approx 150mVp-p
approx 200mVp-p
– VIDEO BOARD –
1
IC502 qd
XOUT
10MHz
2
IC505 ug
COUT
H
3
IC505 yl
YOUT
H
4
IC304 9
COUT
4Vp-p
0.6Vp-p
1Vp-p
7
IC509 ql
LRCK
8
IC509 qj
BCK
9
IC504 8
384FS
q;
IC504 6
27M
44.1kHz
2.11MHz
33.8MHz
5.0Vp-p
5.0Vp-p
5.0Vp-p
– MAIN BOARD –
1
IC501 qa (XC-OUT)
STOP MODE
32.768kHz
2
IC501 qd (X-OUT)
STOP MODE
16MHz
3
T301 4
TAPE B REC MODE
3.0Vp-p
2.8Vp-p
80.7kHz
120Vp-p
– PANEL BOARD –
1 IC601 is (XOUT)
STOP MODE
4MHz
3.0Vp-p
5
IC304 qg
YOUT
6
H
27MHz
4.0Vp-p
1.5Vp-p
2Vp-p
H
0.7Vp-p
27MHz
2020
6-2. BLOCK DIAGRAMS
– TUNER/CD SECTION –
HCD-VX777
FM 75Ω
AM
TM1
G
OPTICAL
PICK-UP
BLOCK
(A, MAX3)
+5V
1
Q101
LD
DRIVE
VX777 MODEL
FE1
IF OUT
ANT IN
2
11
49
7
OSC OUT
8
VT
5
10
RB4
RF AMP
IC103
27
VC
6
A
7
B
8
C
9
D
10
E
11
F
1
LD
2
PD
IC102 MOTOR/COIL DRIVE
47
VO1+
52
VO1–
55
VO2+
56
VO2–
RFA
RFDCO
RFDCI
FE
TE
IN1+
IN1–
IN2+
IN2–
15
28
29
16
18
22VCC
12SW
35
34
32
31
AM/FM IF MPX
1
FM IF
FM
OSC FM
VCO STOP
10
IF REQ MUTE
AM RF IN
AM OSC
VCC
9
DIGITAL OUT
B
VIDEO
IC11
AM MIX OUT
CD
L OUT
R OUT
AM IF IN
TUNED
STEREO
13
14
4
2
6
7
BUFFER
Q11
R-CH
IF11
Q2
D OUT
PCMD
B CLK
L RCK
C2PO
DATA
XLAT
CLOK
SENS
S CLK
MUTE
XTSL
SCOR
SQSO
SQCK
XRST
XTAI
Q1
RF IF
AMP
10
1
22
16
20
19
18
FM
XIN
XOUT
FM OSC
AOUT
AIN
PD
64
66
67
65
14
4
5
6
7
8
3
69
15
76
77
2
71
PLL
IC51
FM/AM IF
AM OSC
RV11
12
FM
7
15
9VCO STOP
8IF REQ
DO
6DO
DI
DI
4DI
CL
CE
CL
5
CE
3
A DATA
B CLK
L RCK
C2PO
DATA
XLT
CLK
SENS
S CLK
MUTE
CTRL1
SCOR
SUSQ
SQCK
XRST
XTAI
IC201
OPTICAL
DIGITAL
OUT
11
24
12
21
23
SECTION
(Page 22)
CF1 CF2
+B A+12V
JR9
X51
4.5MHz
1
8
7
63
DIGITAL SERVO
A+5V
S101
LIMIT
SWITCH
DIGITAL SIGNAL PROC.
D/A CONV.
IC101
26
SSTP
50
RFAC
43
RFDC
39
FE
41
TE
40
SE
26
SSTP
33
FFDR
34
FRDR
31
TFDR
32
TRDR
LPF11
LPF
L-CH
DO
DI
CL
CE
A
MAIN
SECTION
(Page 23)
MASTER CONTROL
TUNED
3
STEREO
2
21
ST MUTE
23
MC DO
25
MC DI
27
CL
22
CE
BU UP/DOWN SW
IC501(1/2)
MTR CNT2
T SENS
• RCH is omitted
• Signal Path
: FM
: AM
: CD
: DIGITAL OUT
: VIDEO
IC701
44
45MTR CNT1
49
46OPEN SW
47CLOSE SW
48
9
MOTOR
DRIVE
7
TBL ADDRESS
4
2
IC711
SENSOR
OPEN/CLOSE
S701
S711
BU UP/
DOWN
M721
M
TURN
MOTOR
M102
SLED
MOTOR
M101
SPINDLE
MOTOR
1
VO3+
IN3–
26
30
SRDR
M
2
VO3–
5
VO4+
IN3+
IN4R
27
24
M
10
VO4–
STBY
8
29
SFDR
C
25
MDP
VIDEO
SECTION
2
I
C, DATA
2
C, CLK
I
XRST
30
29
43
IIC-DATA
IIC-CLK
XRST
(Page 22)
LPH
LD ON
2121
HCD-VX777
– VIDEO SECTION –
B
CD
SECTION
(Page 21)
ADATA
BCLK
LRCK
C2P0
DATA
XLT
CLK
SENS
SCLK
MUTE
CTRL1
LPH
LDON
SCOR
SUBQ
SQCK
1
13
5
LEVEL SHIFT
IC501
DATAI
DATAO
CLK1
HRDY
INT
HSEL
RST
CLK1, DATA0
DATA0
DATAI
CLK1
INT
HSEL
HRDY
RESET
INVERTER
Q502
INVERTER
Q501
D-RAM
IC507
RAS
UCAS
LCAS
A0
RASO
16 - 19 22 - 26
CAS
13 14 28 29
38 42 40
MWE WE
4
10
8
4
CD-DATA
3
CD-BCK
CD-LRCK
5
6
CD-C2P0
112
HD-OUT
119
HD-IN
117
HCK
HRDY
113
114
HINT
121
HSEL
60
RESET
PGIO2/VSYNC/CSYNC
93
PGIO3/HSYNC
101
35
DATA1O
36
DATA1I
37
CLK1
CL680 INT
20
87
CL680 HSEL
85
CL680 HRDY
86
680 RESET
21
HSYNC IN
45
VSYNC
DSP DATA
95
97
DSP LATCH
5
DSP CLK
1
SENSE
SENSE CLK
2
10
DSP MUTE
11
CTRL1(L:DOUBLE)
81
LPH
LDON
82
18
SCOR
84
SUBQ DATA
SUBQ CLK
83
DEVICE RESET
77
A8
DQ1
2 - 10 31 - 39
VIDEO CD CONTROL
IC502
DQ16
VIDEO/CD DECODER
RESOLUTION
CHROMA LEVEL
BGP
V. MUTE
DF LATCH
XIN
XOUT
I2C.DATA
2
I
C.CLK
XRESET
TEST1
TEST2
TEST3
TEST LED
RTS1
BUS XHOLD
BUS XWRL
O0
13 - 15 17 - 21
IC505
3
4
22
65
88
15
13
30
29
12
74
75
76
73
TP522
34
41
46
X501
10MHz
TP523
O7
10 - 29
MD0
ROM
IC506
A11
25 4 28 29 3 2 30 12 - 5 27 26 23
I
MD15
5V
SELF-DIAGNOSIS
SL503
SL502
SL501
A17
A0
TEST
MODE
58 - 44
I
MA0
Y-OUT
C-OUT
DA-DATA
DA-LRCK
DA-BCK
VCK-IN
DA-XCLK
MA10
A10
CE
22
37
MCE
69
75
110
108
111
106
86
DATAI
CLK1
DATAO
CN503
1
2
5
8
3
11
10
10
5
Y AMP/PICTURE CORRECTION
1
8
5
Q301
27MHz
DATA0
CLK1
TXD
S CLK
FOR
RXD
FLASH
RST
ROM
BUSY
WRITE
HOLD
XWR
IC303
HUE CONTROL
VIDEO
IN
CONTROL
IC302
V IN
TINT
BGD
1
VIDEO
OUT
6
V OUT
DIGITAL FILTER & D/A CONVERTER
18
19
17
9
8
7
IC509
D/A
CONV
MODE
10 21 20 4
RSTB
PLM
CLOCK
DIVIDER
3
11
1
3.3V REG
Q531
2
7
1
8
Y IN
C IN
MUTEA
MUTEB
14
11
1
24
IC304
Y/C MIX
MIX OUT1
Y OUT1
C OUT1
R-CH
X503
27MHz
FREQUENCY
LEVEL SHIFT
IC504
CT503
VIDEO
+3.3VD5V
12
15
9
6
8
AMP
IC101
27MHz
384FS
J302
VIDEO OUT
4
132
13
CD-L
(L - CH)
S VIDEO
OUT
D
MAIN
SECTION
J301
(Page 23)
2
I
C.DATA
2
I
C.CLK
XRST
C
TUNER
SECTION
(Page 21)
XRST
XTAI
(XTAL 33.8MHz)
2222
– MAIN SECTION –
TUNER
SECTION
(Page 21)
VIDEO
SECTION
(Page 22)
MD/VIDEO
(AUDIO)
REC/PB
HEAD
PB
HEAD
ERASE
HEAD
L
R
A
D
J101
DECK-A
DECK-B
TC BLOCK
A120/70
B120/70
A HALF
B HALF
A PLAY
B PLAY
A SHUT
B SHUT
L-CH
LOUT
L-CH
R-CH
R-CH
R-CH
R-CH
PB EQ
AMP
IC303
PB EQ
AMP
IC304
RV304
REC
BIAS
T301
C332,L301
BIAS
TRAP
RV302
RV303
1
2
3
BIAS
OSC
Q302,303
REC/PB SWITCH
IC302
TA+12V
Q301
+6V
R CH
Q141
BIAS
HCD-VX777
J102
SURROUND
INPUT SELECT
TONE/VOL CONT
IC101
40
VOL OUT2
IN2A
38
IN2C
37
IN2D
DECK PROC.
IC301
48
A
B
46
SWITCH
4
Q304,305
REC
36
EQ
NORM
33
BIAS
CROM
SW
32
DC
A+12V
REC
DOLBY
PB
39
A120/70
17
B
DOL
PAS
PB A/B
NORM/HIGH
ALC ON/OFF
B NORM/CROM/METAL
15
16
18
19
70
120
38
RV301
REC(L)
LEVEL
RM ON/OFF
BIAS ON/OFF
20
22
NR ON/OFF
23
24
REC
43
PB
LM ON/OFF
MS OUT
REC /PB/PASS
25
26
35
INVOL OUT2
40
39
21
22
R-CH
X501
32.768kHz
IN2B
DATA
CLOCK
REF
X502
16MHz
24
Q101,102
1
Q503
SWITCH
DBFB
CONT
DBFB
IC102
5
7
6
Q504,505
MUTE
MUTE
Q103
CONT
Q503,504
MUTE
CONT
D822
MUTE
Q581
IC501
18
10
POWER
AMP
12
D551
J721
MIC 1
J722
MIC 2
Q861
MUTE
CONT
MUTE
Q862
Q501, 551
OVER LOAD
DETECTOR
Q505,506+B
OVER HEAT
DETECTOR
IC722 IC722
RV722
MIC
VOL
D502
Q821,822
PROTECT
DETECTOR
2
IC721
ECHO
LEVEL
6
Q823
PROTECT
CONT
RV721
ECHO
LEVEL
Q828,829
PROTECT
CDM M+7V
SWITCH
Q824,825
RELAY
DRIVE
10
6
5
4
3
RY801
SPEANA
S768-781
FUCTION
S753-767
FUCTION
S601-606
FUCTION
VOLUME
IC602
BPF
KEY
KEY
KEY
S751
R CH
R CH
R CH
78
HEADPHONE
67
12
BPF 0
72
18
BPF 5
ALL BAND
73
11
64
KEY0
65
KEY1
66
KEY2
VOL 1A
80
VOL 1B
79
IIC DATA
60
IICCLOCK
61
RESET
77
SPEAKER
TM801
L
R
DISPLAY CONTROL
IC601
PLAY1-3
EXIST1-3
REC/PAUSE LED
ENTER LED
TAPE/A/B LED
TUNER A/B LED
MD/VIDEO LED
CD/VCD LED
SPEAKER
P1
P47
G1
G13
XIN
XOUT
J631
PHONES
6
47
1
5
•
93
100
10
5
52
53
54
55
56
57
58GAME IN LED
59DISC 1 LED
74DISC 2 LED
75DISC 3 LED
83
82
F1
X601
4.0MHz
Q606-614
LED
DRIVER
Q630-635
LED
DRIVER
Q751,752
LED
DRIVER
Q601-605
LED
DRIVER
Q791-793
LED
DRIVER
FL601
FLOURESCENT
INDICATOR TUBE
D751,752
D604-609
D612-618
D791-793
F2
D630-632
A TRG M+
B TRG M+
CAP M H/L
CAP M+
CN304
Q393,394
A TRIG
DRIVE
Q391,392
B TRIG
DRIVE
Q395
CAP MOTOR
SPEED CONT
Q396,397
CAP MOTOR
DRIVE
51
A TRIG
52
B TRIG
54
CAP M H/L
55
CAP M CONT
90
B SHUT89A SHUT
57
B PLAY56A PLAY
91
B HALF70A HALF
69
TC RELAY
67
66
PB A/B
EQ H/N
MASTER CONTROL
68
ALC
65
61
BIAS
IC501(2/2)
60
59
REC MUTE
NR ON/OFF
58
53
TC MUTE
R/PB PAS
AMS IN
80
GEQ DATA
81
GEQ CLK
82
LINE MUTE
CDM M+7V
LED+7V
83
STK MUTE
87
88
PROTECT
FRONTRELAY
10
11
15
X IN
XC IN
XC OUT
79
13
X OUT
DBFB ON/OFF
30
29
IIC DATA
STBY RELAY
IIC CLK
POWER KEY
RESET
1284
100
CD POWER
AC CUT
74
38
CD D+5V
CD A+5V
A+5V
A+12V
TCA+12V
MCA+12V
STA+12V
TCMM+9V
D920-922
Q575
Q694
LED
DRIVER
F976
D543
VH
-VH
VL
IC502
RESET
-VL
Q971
RELAY
DRIVER
IC911
3
1
REG
IC951
3
1
REG
IC921
3
1
REG
IC961
3
1
REG
FAN
Q891,892
FAN
DRIVER
D541
D901-904
D906-909
F977
F974
F975
VP
VF(1)
VF(2)
3
IC971
+5.6V
REG
T910
F971
JW971
JW974
JW973
RY971
SUB
TRANSFORMER
T972
D972-975
1
JW975
JW993
JW990
230-240
120
S901 (1/2)
220
230-240
JW954
120
220
S901 (2/2)
CN974
D794
POWER
2
AC
IN
1
2323
HCD-VX777
6-3. SCHEMATIC DIAGRAM – BD SECTION – • See page 20 for Waveforms. • See page 58, 59 for IC Block Diagrams. • See page 48 for IC Pin Function.
TO
VIDEO BOARD
(1/3)
(Page 27)
IC B/D
Note:
The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
2424
Replace only with part number specified.
6-4. PRINTED WIRING BOARD – BD SECTION – • See page 19 for Circuit Boards Location.
HCD-VX777
There are a few cases that the part isn’t mounted
in model is printed on diagram.
(Page 26)
• Semiconductor
Location
Ref. No. Location
D101 D-2
IC101 C-2
IC102 A-2
IC103 C-1
IC106 D-3
Q101 C-1
Q103 D-2
2525
HCD-VX777
6-5. PRINTED WIRING BOARD – VIDEO SECTION – • See page 19 for Circuit Boards Location.
(Page 25)
(Page 30)
• Semiconductor
Location
Ref. No. Location
IC101 D-3
IC303 A-3
IC504 C-3
IC505 B-2
IC507 B-3
IC509 C-3
Q501 B-2
Q502 B-1
30
31
50
51
1
100
81
80
• Semiconductor
Location
Ref. No. Location
D501 B-3
IC302 A-3
IC304 A-1
IC501 C-2
IC502 D-2
IC506 C-1
Q301 B-3
Q531 C-2
2626
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