Sony HCD-VX55, HCD-VX55J Service manual
HCD-VX55/VX55J
SERVICE MANUAL
• HCD-VX55/VX55J is the tuner,
deck, CD and amplifier section in
MHC-VX55/VX55J.
Photo: HCD-VX55
CD CD Mechanism Type CDM58-K2BD37A
Section Base Unit Name BU-K2BD37A
Tape deck Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type TCM-230PWR11C
E Model
HCD-VX55/VX55J
Tourist Model
HCD-VX55J
Model Name Using Similar Mechanism NEW
Optical Pick-up Name KSM-213DAP
SPECIFICATIONS
Amplifier section
The following measured at AC 120, 220, 240V
50/60 Hz
DIN power output (rated) 95 + 95 watts
Continuous RMS power output (reference)
Inputs
MD/VIDEO (AUDIO) IN:voltage 450 mV/250 mV,
(phono jacks) impedance 47 kilohms
MIC: sensitivity 1 mV,
(phone jack) impedance 10 kilohms
Outputs
VIDEO OUT: max. output level 1 Vp-p,
(Phono jack) unbalanced, Sync
S-VIDEO OUT: Y: 1 Vp-p, unbalanced
(4 pin/mini-DIN jack) Sync negative
PHONES: accepts headphones of 8
(stereo mini jack) ohms or more
FRONT SPEAKER:
(6 ohms at 1 kHz, DIN)
125 + 125 watts
(6 ohms at 1 kHz,
10% THD)
negative, load impedance
75 ohms
C: 0.286 Vp-p
load impedence 75 ohms
accepts impedance of 6 to
16 ohms
VIDEO CD/CD player section
System Compact disc and digital
Laser Semiconductor laser
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wavelength 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)
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),
audio system
(λ=780nm)
Emission duration:
continuous
NTSC, PAL
using Sony TYPE I
cassette
— Continued on next page —
MINI Hi-Fi COMPONENT SYSTEM
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency
AM tuner section
Tuning range
Middle Eastern models: 531 – 1,602 kHz
Other models: 531 – 1,602 kHz
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
Tourist model : 76 - 108 MHz
Other models : 87.5 – 108.0 MHz
10.7 MHz
(with the interval set at 9
kHz)
(with the interval set at 9
kHz)
530 – 1,710 kHz
(with the interval set at 10
kHz)
General
Power requirements
Thailand models: 220 V AC, 50/60 Hz
Other models: 120 V, 220 V or 230 - 240
Power consumption
Dimensions (w/h/d)
Mass:
Supplied accessories: AM loop antenna (1)
V AC, 50/60 Hz
Adjustable with voltage
selector
230 watts
Approx. 280 x 360 x 425
x 143/16 x 1611/
mm (11
in.)
Approx. 9.5 kg
(21 lb.)
Remote commander (1)
Batteries (2)
Video cable (1)
FM lead antenna (1)
Front speaker pads (8)
16
Design and specifications are subject to change
without notice.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety
checks before releasing the set to the customer.
1. Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair . Point
them out to the customer and recommend their replacement.
4. Look for parts which, through functioning, show obvious signs
of deterioration. Point them out to the customer and
recommend their replacement.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 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.
5. Check the B+ voltage to see it is at the values specified.
6. Flexible Circuit Board Repairing
• Keep the temperature of the 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.
2
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.
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.
TABLE OF CONTENTS
1. SERVICE NOTE ·······························································4
2. GENERAL ··········································································5
3. DISASSEMBY ·································································· 7
4. TEST MODE ···································································· 12
5. MECHANICAL ADJUSTMENTS ····························· 16
6. ELECTRICAL ADJUSTMENTS ·······························16
7. DIAGRAMS
7-1. Circuit Board Location ·················································23
7-2. Block Diagrams ····························································25
7-3. Printed Wiring Board BD Section ····························· 28
7-4. Schematic Diagram BD Section ································29
7-5. Printed Wiring Board Main Section ··························30
7-6. Schematic Diagram Main Section (1/3) ···················· 31
7-7. Schematic Diagram Main Section (2/3) ···················· 32
7-8. Schematic Diagram Main Section (3/3) ···················· 33
7-9. Printed Wiring Board Power AMP Section ···············34
7-10. Schematic Diagram Power AMP Section ················ 35
7-11. Printed Wiring Board Panel Section ························ 36
7-12. Schematic Diagram Panel Section ··························· 37
7-13. Printed Wiring Board Leaf SW Section ··················· 38
7-14. Schematic Diagram Leaf SW Section ····················· 39
7-15. Printed Wiring Board Driver Section······················· 40
7-16. Schematic Diagram Driver Section ························· 41
7-17. Printed Wiring Board Video CD Section ················· 42
7-18. Schematic Diagram Video CD Section (1/2) ···········43
7-19. Schematic Diagram Video CD Section (2/2) ···········44
7-20. Printed Wiring Board Power Section ······················· 45
7-21. Schematic Diagram Power Section·························· 45
7-22. IC Pin Function Description ······································· 46
7-23. IC Block Diagrams ····················································· 50
8. EXPLODED VIEWS
8-1. Main Section ································································· 54
8-2. Panel Section ································································ 55
8-3. Main Board Section ······················································56
8-4. Tape Mechanism Section (TCM-230PWR11) (1/2)····· 57
8-5. Tape Mechanism Section (TCM-230PWR11) (2/2)····· 58
8-6. CD Mechanism Section (CDM58-K2BD37) ··············· 59
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.
9. ELECTRICAL PARTS LIST ······································· 60
3
SECTION 1
SERVICE NOTE
2
Panel board
Note for installing the panel board
Hot melt
1
Cut the eleven melted-connection points with a cutting plier.
Screw hole
Attach the panel board with
six screws (
after the board is removed once.
Do not tighten the screws excessively.
+BVTP 2.6 × 8
)
4
SECTION 2
GENERAL
wd
ws
wa
w;
ql
qk
qj
12345
qfqgqh
qd
6
7
8
9
q;
qa
qs
Photo: HCD-VX55
el
ek
ej
eh
eg
ef
r;
wg
wh
wj
wk
wl
wf
esed
ea
1 DISC SKIP EX-CHANGE button
2 DISC 1 button and indicator
3 DISC 2 button and indicator
4 DISC 3 button and indicator
5 Z OPEN/CLOSE button
6 EDIT, TUNER MOMERY button
7 PLAY MODE, STEREO/MONO button
8 REPEAT button
9 DIRECTION button
q; CINEMA SPACE button
qa VOLUME knob
qs PHONE jack
qd ENTER button
qf REC PAUSE/START button and indicator
qg CD SYNC HI-DUBB button
qh KARAOKE PON/MPX button
qj V-GROOVE button and indicator
qk CURSOL button and indicator
ql GROOVE button
w; EQ EDIT button
wa SPECTRUM button
ws DISPLAY button
wd ?/1 button and indicator
wf PREV button
wg NEXT button
wh RETURN button
wj TUNER BAND button
wk MD (VIDEO) button
wl Y/SELECT button
e; > + button
ea X button
es – . button
ed x button
ef MIC1/MIC2 jack
eg MIC LEVEL button
eh ECHO LEVEL button
ej PICTURE EFFECT button
ek T APE A/B button
el CD button
r; m/M knob
5
This section is extracted from
instruction manual.
Step 2: Setting the
time
You must set the time before using the timer
functions.
O
X
Y
2,4
1
Press CLOCK/TIMER SET.
The hour indication flashes.
NX
v
bB
V
xMm>.
x
1
3,5
3
Press ENTER.
The minute indication flashes.
4
Press
.or>
repeatedly to set
the minute.
5
Press ENTER.
The clock starts working.
Tip
If youÕve 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:
1
Press CLOCK/TIMER SET.
2
Press.or>repeatedly to select
SET CLOCK.
3
Press ENTER.
4
Perform steps 2 through 5 above.
2
Press
.or>
the hour.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
repeatedly to set
6
SECTION 3
DISASSEMBY
Note : Follow the disassembly procedure in the numerical order given.
3-1. UPPER CASE (TOP)
5
Two screws (Case)
Side panel L
Upper case (Top)
7
Two screws
(+BVTP 3
8
×
q;
10)
9
Four screws (+BVTP 3
Side panel R
4
×
10)
6
Screw (Case)
3-2. LOADING PANEL ASSY
CD mechanism deck (CDM58)
1
Turn the pulley to the direction of arrow.
pulley
Front panel side
Loading panel assy
3
1
Two screws (Case)
2
Screw (Case)
3 Tw o
screws
(+BVTP 3
×
10)
2
Pull-out the disc tray.
7
3-3. FRONT PANEL SECTION
4
Screw (+BVTP 3
CD mechanism deck (CDM58)
qd
Video Board
×
10)
8
Flat type wire
(CN502)
7
qa
qs Tw o
screws
(+BVTP 2.6
5
(+BVTP 3
2
Connector (CN1)
9
(CN501)
×
8)
Screw
Flat type wire
×
10)
1
Flat type wire
(CN304)
q; Tw o
screws
(+BVTP 3
×
10)
6
Three screws (+BVTT 3
3-4. TAPE MECHANISM DECK
×
3
Connector (CN2)
Front panel section
6)
4
Bracket assy (Heart cam L)
3
Screw (+BVTP 2.6
5
Five screws (+BVTP 2.6
×
8)
×
8)
1
Screw (+BVTP 2.6
2
Bracket assy (Heart cam R)
×
8)
6
Tape mechanism deck
8
)
3-5. PANEL BOARD
2
Two screws
(+BVTP 2.6
×
8)
1
Knob (Volume)
4
5
FR knob
Bracket (FR)
3
Two bosses & four pins
8
Three claws
6
7
Three screws
(+BVTP 3
9
CD Switch board
qs
Panel board
qa
Five claws
q;
Cut the eleven melted-connection points with a cutting plier.
Note: When attching the panel board,
refer to "Service Note" on page 4.
×
10)
3-6. SUB-TRANS BOARD AND TRANS BOARD
1
Connector (CN975)
6
Trans board
2
Connector (CN977)
3
(+BVTT 4
4
Two screws (+BVTT 4
5
×
6)
Trans
Two screws
×
9
Back panel
8
Five screws
(+BVTP 3
6)
7
Two screws
(+BVTP 3
×
10)
×
10
9
3-7. MAIN BOARD AND AMP BOARD
)
4
Three screws (+BVTP 3
5
Powe r
AMP board
3
Two screws (+BVTP 3
×
10)
×
10)
7
Heat sink
6
Two screws (+BVTP 3
×
10)
2
Main board
3-8. LEAF SW BOARD, HEAD (A) BOARD AND HEAD (B) BOARD
1
Five claws
1
Two screws (+BVTP 3
2 Leaf
SW board
Remove the four solderings.
×
8
10
4
Head (A) board
3
Screw (+PS 2.6
×
5
5)
6
Head (B) board
Screw (+PS 2.6
×
5)
)
3-9. BASE UNIT
7
Two insulators
Base unit
4
BD board
6
8
Two insulators
5
Four screws (+PTPWH 2.6
2
Flat type wire (CN102)
1
Flat type wire (CN101)
3
Screw (+BVTT 2.6
×
8)
3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD
9
q;
Tray
3
Connector (CN701)
Screw (+PTPWH 2.6
qa
Screw (+BVTP 2.6
2
Driver board
7
×
8)
Motor board
×
5
Three screws (+BVTP 2.6
4
Flat type wire (CN721)
8)
6
Remove the two solderings of motor.
qs
Address sensor board
×
8)
1
Screw (+BVTP 2.6
8
Pull-out the disc tray.
×
8)
11
SECTION 4
TEST MODE
[MC 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 displays “COLD RESET” and
the set is reset.
[CD Ship Mode]
• This mode moves the pickup to the position durable to vibration. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Press three buttons x , ENTER , and SPECTRUM
simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship mode is set.
[MC 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.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x , ENTER , and Z OPEN/CLOSE si-
multaneously.
4. The CD service mode is selected.
5. With the CD in stop status, turn the shuttle knob clockwise to
move the pickup to outside track, or turn the shuttle knob
counter-clockwise to inside track.
6. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press three buttons in the same manner as step 2.
Note: • Always move the pickup to most inside track when exiting from
this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
• A step of MW 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.
[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, VC version, CD version, CM
version, ST version, TC version, TA version, TM version and
BR 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
“KEY0 VOL0”. 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 e xit from this mode, press three b uttons in the same manner
as step 1, or disconnect the power cord.
[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.
12
[MC Test Mode]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.
Procedure:
1. Press the three buttons of x , ENTER and DISC 3
simultaneously.
2. A message “TEST MODE” appears on the FL display tube.
3. When f (CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ AMX” appears.
4. When F (CURSOR DOWN) button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.
5. When g (CURSOR LEFT) or G (CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
6. 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.
7. 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.
8. 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, by oper ating the Shuttle
knob. (It means that the memory is cleared.)
9. When CD is selected and the EDIT button is pressed, the disc
that is being chucked at this moment becomes the default
setting. It means that the default disc only is accessed when
any other discs are selected even though the display indication
changes accordingly. At the same time, the DISK SKIP EXCHANGE and OPEN/CLOSE cannot be accepted. (It means
that the tray motor and the turntable motor are disabled of their
operation.)
10. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
11. When x button is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound using the Shuttle knob, tape
is rewound, tape is stops at around the record-starting position
and playback of the recorded portion of the tape is started. If
P A USE is inserted even once during recording, ta pe is rewound
to the position around the P AUSE position and is played back.
12. When the CD SYNC HI-DUB Button is press during playback
of Deck B, either normal speed or high speed can be selected
by this button.
13. Select the desired loop by pressing the PLAY MODE button.
Insert a test tape AMS-110A or AMS-RO to Deck A.
14. Press the SPECTRUM button to enter the AMS test mode.
15. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
16. Then the REW AMS is checked and the mechanism is shut of f
after detecting the AMS signal twice.
17. When the check is complete, a message of either OK or NG
appears.
18. When you want to exit this mode, press the ?/1 button twice.
The cold reset is enforced at the same time.
13
[Tape Aging Mode]
This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.
• If an error occurred:
The aging operation stops and displays then status.
• If no error occurs:
The aging operation continues repeatedly.
Procedure:
1. Load the tapes into the decks A and B respectively.
2. Press the CD button to select the function “CD”.
3. Press the PLAY MODE button to set the ALL DISCS mode,
and press the REPEAT button to “REPEAT” off.
4. Press three buttons of p , ENTER , and DISC SKIP/EX-
CHANGE simultaneously.
5. The aging mode is activated.
6. To exit from the aging mode, press the 1/u button to turn the
power OFF and operate the cold reset. (Refer to the “MC Cold
Reset”)
1. Display at the Aging Mode
• Display operating state of tape deck section alternately.
• If an error occurred, stop display.
2. Tape Deck Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Aging mode sequence (Tape deck section) :
Rewind the tape A and B
“TAPE A AG-1”
Shut off
FWD play the tape A
“TAPE A AG-2”
2 minutes
Fast forward the tape A
“TAPE A AG-3”
Shut off or 20 seconds
REV play the tape A
“TAPE A AG-4”
2 minutes
Rewind the tape A
“TAPE A AG-5”
Shut off
FWD play the tape B
“TAPE B AG-2”
2 minutes
Fast forward the tape B
“TAPE B AG-3”
Shut off or 20 seconds
REV play the tape B
“TAPE B AG-4”
2 minutes
Rewind the tape B
“TAPE B AG-5”
Shut off
Note: “TAPE * AG-*” is display of each step.
14
[CD Aging Mode]
k
k
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
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
[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.
VIDEO board (SIDE A)
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]
* elect 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 J302 (VIDEO
OUT) 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)
CN501
J301
SL503
SL502
SL501
CHECK LED
J302
CN503
CN502
15
SECTION 5
r
MECHANICAL ADJUSTMENTS
SECTION 6
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 Torque meter
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
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)
Pin 1 (R-CH)
MAIN board
CN301
Pin 2 (GND)
level mete
+
–
16
2. Turn the adjustment screw and check output peaks. If the peaks
e
r
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
CN301 (Pin 3 : L-CH)
(Pin 1 : R-CH)
level meter
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
Tape Speed Adjustment
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
DECK B
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)
frequency counte
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
oscilloscop
V
wrong
H
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
set
MAIN board
CN301 (Pin 3 : L-CH)
(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
Playback level Adjustment
DECK A DECK B
Procedure:
Mode: Playback
forward
reverse
Deck A is RV302 (L-CH) and RV352 (R-CH), Deck B is RV303
(L-CH) and RV353 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN301 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 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)
17
REC Bias Adjustment DECK B
e
)
)
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.)
4. Mode: Record
MD/VIDEO (AUDIO) IN
AF OSC
315 Hz, 50 mV (–23.8 dB)
attenuator
5. Mode: Playback
600 Ω
blank tape
CS-123
set
1. Press MD(VIDEO) button to select MD. (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 P AUSE/STAR T b utton, 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
blank tap
CN-123
set
5. Mode: Playback
recorded
portion
set
MAIN board CN301C(Pin 3 : L-CH)
(Pin 1 : R-CH
level meter
+
–
recorded
portion
set
level meter
+
–
MAIN board CN301C(Pin 3 : L-CH)
(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
[MAIN BOARD] (Component Side)
T601
RV611
REC LEVEL (L)
(B)
PB LEVEL (R)
(A)
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 R V354 (R-CH) on the MAIN 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.)
1. Press MD(VIDEO) button to select MD. (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 P AUSE/STAR T b utton, press REC PAUSE/
START button, then recording start.
PB LEVEL (L)
(A)
PB LEVEL (R)
(B)
REC LEVEL (R)
(B)
BIAS LEVEL (L)
[LEAF SW BOARD] (Component Side)
TAPE SPEED
(NORMAL) (HIGH)
RV1002
RV1001
CN301
RV351
13
RV301
RV352
RV302
RV353
RV303
PB LEVEL (L)
(B)
BIAS LEVEL (R)
CN1001
CN304
CN302
RV304
RV354
18
FM Tuned Level Adjustment
FM RF SSG
75 Ω coaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75 W open)
set
FM ANTENNA terminal
(TM601)
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indica ted.
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
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
(TM601)
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 T601 ubtil
the voltage becomes 0 V.
Oscilloscope
BD board
TP(FEO)
TP(VC)
Procedure :
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCONT) and TP (GND) by lead wire.
4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
6. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak lev el
within 4 ±1 Vp-p.
S-curve waveform
symmetry
A
within 4 ±1Vp-p
B
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] Component side
NULL
T601
RV611
FM TUNED LEVEL
CN301
RV351
7. After check, remove the lead wire connected in step 2 and 3.
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(VC)
Procedure :
CN304
13
RV301
RV303
RV352
RV302
RV353
CN302
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCONT) and TP (GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
6. After check, remove the lead wire connected in step 2.
RV304
RV354
19
Note : Clear RF signal waveform means that the shape “ ◊ ” can be clearly
e
)
distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45 ± 0.3Vp-p
E-F Balance (1 Track jump) Check
oscilloscop
BD board
Adjustment Location:
[BD BOARD] (Conductor Side)
TP (RF)
TP (VC)
TP(TEO)
TP(VC)
Procedure :
1. Connect oscilloscope to TP (TEO) and TP (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the X button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
0V
level=1.3 ± 0.6Vp-p
Specified level: –– × 100=less than ±22%
A
B
B
symmetry
center of
waveform
A (DC voltage
6. After check, remove the lead wire connected in step 1.
TP (FE0)
IC103
TP (TEO)
IC101
20
VIDEO SECTION
r
Frequency Adjustment
Connection:
VIDEO board
(27 MHz)
frequency counte
Procedure:
1. Connect the frequency counter to check point of the VIDEO
board.
2. Turned power switch on.
3. Press the CD button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency counter
reading 27.0 MHz ± 80 Hz at stop status.
Adjustment Location:
[VIDEO BOARD] (Component Side)
J301
J302
IC507
CN501
SL503
SL502
SL501
CHECK LED
CN502
(27MHz)
(GND)
CT503
VIDEO
Frequency
Adjustment
CN503
21
HCD-VX55/VX55J
SECTION 7
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
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.
¢
•
• C : panel designation.
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
• Voltages are taken with a VOM (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 production 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
EA : Saudi Arabia model
MY : Malaysia model
SP : Singapore model
TH : Thai model
TW : Taiwan model
IA : Indonesia model
HK : Hong Kong model
JE : Tourist model
4
W or less unless otherwise
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
• Indication of transistor.
C
These are omitted.
Q
B
CE
These are omitted.
Q
B
E
22
7-1. CIRCUIT BOARD LOCATION
HCD-VX55/VX55J
CD SWITCH Board
PANEL Board
LEAF SW Board
HEAD (A) Board
MOTOR Board
ADDRESS SENSOR Board
TRANS Board
DRIVER Board
VIDEO Board
BD Board
MAIN Board
POWER AMP Board
HEAD (B) Board
23
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