Sony HCD-XGV50 User manual

HCD-XGV50
Mexican Model
COMPONENT Hi-Fi STEREO SYSTEM
— Continued on next page —
SPECIFICATIONS
•HCD-XGV50 is the Amplifier,
CD player, tape deck and tuner
section in LBT-XGV50.
Ver 1.0 2003.08
9-961-115-01
2003H02-1
© 2003.08
Model Name Using Similar Mechanism HCD-XGV80
CD CD Mechanism Type CDM37B-30BD62
Section Base Unit Name BU-30BD62
Optical Pick-up Name A-MAX.3
TAPE Model Name Using Similar Mechanism HCD-XGV80
Section Tape Mechanism Type CWM43RR23
SERVICE MANUAL
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
The following measured at AC 127 V, 60 Hz
DIN power output (rated): 135 + 135 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
165 + 165 watts
(6 ohms at 1 kHz, 10% THD)
Inputs
PHONO IN (phono jacks): sensitivity 3 mV,
impedance 47 kilohms
MD (VIDEO) IN L/R (phono jacks):
sensitivity 450 mV(250 mV),
impedance 47 kilohms
Outputs
PHONES (stereo phone jack): accepts headphones of 8 ohms or more
MD (VIDEO) OUT L/R (phono jacks):
voltage 250 mV, impedance 1 kilohms
VIDEO OUT (phono jack): max. output level 1Vp-p,
load impedance 75 ohms
FRONT SPEAKER: accepts of 6 to 16 ohms
VIDEO CD/CD player section
System Compact disc digital audio system
Laser Semiconductor laser
(λ=795 nm)
Emission duration: continuous
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
Video color system format NTSC, PAL
Tape deck section
Recording system 4-track 2-channel, stereo
Frequency response 50 – 13,000 Hz (±3 dB),
using Sony TYPE I cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz (50 kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range 530 – 1,710 kHz
(with the tuning interval set at 10 kHz)
531 – 1,602 kHz
(with the tuning interval set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz

2
HCD-XGV50
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE WITH
MARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
General
Power requirements
Mexican models: 120 V or 127 V AC, 60 Hz
Power consumption 150 watts
Dimensions (w/h/d) (Main Unit) Approx. 355 x 425 x 451 mm
Mass (Main Unit) Approx. 13.0 kg
Design and specifications are subject to change without notice.

3
HCD-XGV50
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.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
TABLE OF CONTENTS
1. SERVICING NOTE ·························································· 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
4. TEST MODE ···································································· 16
5. MECHANICAL ADJUSTMENTS ····························· 18
6. ELECTRICAL ADJUSTMENTS ······························· 18
7. DIAGRAMS
7-1. Circuit Board Location ······················································ 22
7-2. Block Diagram – CD Servo Section – ······························· 24
Block Diagram – Tuner/Tape Deck Section – ··················· 25
Block Diagram – Main Section – ······································ 26
Block Diagram
– Display/Key Control/Power Supply Section – ·········· 27
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 Section – ······························ 31
7-7. Printed Wiring Board – Motor LED Section – ·················· 32
7-8. Schematic Diagram –Motor LED Section – ······················ 32
7-9. Schematic Diagram – Main (1/4) Section – ······················ 33
7-10. Schematic Diagram – Main (2/4) Section – ······················ 34
7-11. Schematic Diagram – Main (3/4) Section – ······················ 35
7-12. Schematic Diagram – Main (4/4) Section – ······················ 36
7-13.Printed Wiring Board – Main Section – ····························· 37
7-14. Printed Wiring Board – CD-L, CD-R Section – ················ 38
7-15. Schematic Diagram – CD-L, CD-R Section – ··················· 39
7-16. Printed Wiring Board – TC-A, TC-B Section – ················ 40
7-17. Schematic Diagram – TC-A, TC-B Section – ··················· 41
7-18.Printed Wiring Board – Panel VR, Key Section – ············· 42
7-19. Schematic Diagram – Panel VR, Key Section –················ 43
7-20.Printed Wiring Board – Panel FL Section – ······················· 44
7-21. Schematic Diagram – Panel FL Section – ························· 45
7-22. Printed Wiring Board – Power Amp Section – ·················· 46
7-23. Schematic Diagram – Power Amp Section – ····················· 47
7-24. Printed Wiring Board – Power Supply Section – ·············· 48
7-25. Schematic Diagram – Power Supply Section – ················· 48
7-26. IC Pin Function Description ············································· 49
7-27. IC Block Diagram ····························································· 56
8. EXPLODED VIEWS
8-1. Case, Back Panel Section ·················································· 59
8-2. Front Panel Section-1 ························································ 60
8-3. Front Panel Section-2 ························································ 61
8-4. Chassis Section ·································································· 62
8-5. CD Mechanism Deck Section (CDM37B-30BD62) ········· 63
8-6. Base Unit Section (BU-30BD62) ······································ 64
9. ELECTRICAL PARTS LIST ······································· 65

4
HCD-XGV50 SECTION 1
SERVICING NOTE
SERVICE POSITION FOR BD BOARD AND OPTICAL PICK-UP BLOCK
Optical pick-up block
BD board
4 BU fitting screw
3 Bottom plate
1 Two screws (+BVTP 3 x 8)
5
2

5
HCD-XGV50
This section is extracted from
instruction manual.
SECTION 2
GENERAL
Main unit
ALBUM +/– qh
CD SYNC qf
Deck A ws
Deck B w;
Direct equalizer ef
SALSA/REGGAE/TANGO/
MOVIE/GAME/SAMBA/
ROCK/JAZZ/DANCE/POP
DIRECTION wk
DISC 1 – 5 ek
DISC SKIP ek
Disc tray wd
DISPLAY 2
Display window 7
EDIT wf
EFFECT ej
ENTER eg
FM MODE qs
FUNCTION qa
MD (VIDEO) ea
MEMORY qs
P FILE eh
PHONES jack qg
PHONO e;
PLAY MODE wf
Power illuminator 5
PUSH OPEN wd
Remote sensor 3
REPEAT wf
ALPHABETICAL ORDER
A – D E – J K – R
qlwa w;wswd
e;
ea
wf
wl
wk
qd
qf
qg
23 745 8690qa1
elek
ed ef eg ehej
qs
qh
qj
SLEEP 9
SPECTRUM ANALYZER 4
SURROUND ed
TIMER SELECT 8
TUNER ENTER qs
TUNER/BAND qs
TUNING MODE qs
TUNING +/– qs
VOLUME control 6
X-GROOVE ql
S – Z
?/1 (power) 1
c/CLOCK SET 0
X(pause) qd
h/H (play) qd wl
x(stop) qd wl
.m/M> (rewind/fast
forward) qd wl
zREC qf
./> (go back/go forward)
qj
M/m/</, (cursor) eg
m/M (rewind/fast forward) el
NX (play/pause) el
x(stop) el
A EJECT Z/ZB EJECT (eject) w;
BUTTON DESCRIPTIONS

6
HCD-XGV50
This section is extracted from
instruction manual.
Remote control
ALBUM +/– qj
CLEAR wa
CLOCK/TIMER SELECT es
CLOCK/TIMER SET ed
DISC SKIP e;
DISPLAY ea
EFFECT 8
ENTER 0
FILE SELECT +/– 6
FUNCTION +/– wl
NEXT wj
Number buttons ws
ON SCREEN w;
PLAY MODE qh
PRESET +/– wj
PREV wj
REPEAT qg
SELECT wk
SLEEP qk
SPECIAL MENU 5
SURROUND qa
TUNER/BAND qd
TUNING +/– wg
TV CH +/– 3
TV/VIDEO 4
TV VOL +/– 2
VOL +/– 9
?/1 (power) 1
M/m/</, (cursor) 0
X(pause) wd
x(stop) wf
m/M (rewind/fast forward) wg
./> (go back/go forward) wj
CD N(play) wk
KEY CONTROL #/2wh
RETURN Oqf
TAPE A nN (play) qs
TAPE B nN (play) 7
TV ?/1 ql
ALPHABETICAL ORDER
A – N O – Z
BUTTON DESCRIPTIONS
bB
V
v
qk
qj
qh
qg
qa
q;
6
5
4
1
3
2
7
8
9
qd
qs
qf
bB
V
v
es
ea
e;
wl
wk
wg
wh
ql
w;
wj
wa
ws
wd
wf
ed

7
HCD-XGV50
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE
•The equipment can be removed using the following procedure.
3 Five screws (BVTT 3x6)
8 Case
4 Two screws (BVTP 3x8
)
2 Three screws (CASE3 TP2)
1 Three screws (CASE3 TP2)
5
6
5
6
7
Set Case Front panel section Tape mechanism deck (CWM43RR23)
PANEL FL board, GAME board, TC-A board,
TUNER board, TC-B board
PANEL VR board
KEY board
HEADPHONE board, ALBUM board, Bumper ASSY
CD-L board, DOOR SW board, CD-R board
Back panel, DC fan, MAIN board
VIDEO board
CD mechanism deck (CDM37B-30BD62)
Base unit-1 (BU-30BD62)
Disc table
Base unit-2 (BU-30BD62) BD board

8
HCD-XGV50
3-2. FRONT PANEL SECTION
3-3. TAPE MECHANISM DECK (CWM43RR23)
1 Flat type wire (CN371
)
2 Flat type wire (CN431)
5 Screw (BVTP 3x8)
6 Lug
4 Connector (CN806)
3 Connector (CN311)
8 Four screws (BVTP 3x8)
q; Front panel section
9 Claw
7 Connector (B deck)
1 Flat type wire (13 core)
2 Two screws (BVTP 2.6x8)
3 Two screws (BVTP 2.6x8
)
5 Tape mechanism deck
(CWM43RR23)
Front panel
4

9
HCD-XGV50
3-4. PANEL FL BOARD, GAME BOARD, TC-A BOARD, TUNER BOARD,TC-B BOARD
2 Bracket (TA)
1 Screw (BVTP 2.6x8)
qh Two claws
qd Four screws
(BVTP 2.6x8)
qs Four screws
(BVTP 2.6x8)
w; GAME board
8 Screw (BVTP 2.6x8)
0 Four screws (BVTP 2.6x8
)
qf Four screws (BVTP 2.6x8)
qg Four screws
(BVTP 2.6x8)
3 Screw (BVTP 2.6x8)
4 Bracket (TA)
wg Three claws
wd Three claws
Front panel
wh TC-B board
6 Connector (CN600)
9 Bracket (MAIN)
qj
qa
Five screws (BVTP 2.6x8)
7 Flat type wire
(CN601)
qk PANEL FL
board
wf TUNER board
5 Connector
(CN700)
ws TC-A board
wa Three claws
ql Two claws
1 Three screws (BVTP 2.6x8
)
5 Five screws (BVTP 2.6x8)
8 KEY board
2 OPERATION PANEL ASSY
6 Three claws
3 Flat type wire (CN801)
4 Cursor Front panel
7
3-5. KEY BOARD

10
HCD-XGV50
3-6. PANEL VR BOARD
3 Flat type wire (CN601)
5 Six screws (BVTP 2.6x8)
4 Flat type wire (CN801
)
7 PANEL VR board
1 Volume knob
2 Nut (Supplied with S700)
Front panel
6
3-7. HEADPHONE BOARD, ALBUM BOARD, BUMPER ASSY
6 Five screws
(BVTP 2.6x8)
9 Bumper ASSY
7 Claw
8
1
Tow screws (BVTP 2.6x8)
3 HEADPHONE board
2 Bracket HP PWB
5 ALBUM board
4 Tow screws (BVTP 2.6x8)

11
HCD-XGV50
3-8. CD-L BOARD, DOOR SW, CD-R BOARD
1 Five screws (BVTP 2.6x8
)
Front panel
2 Four screws (BVTP 2.6x8)
qg Screw (BVTP 2.6x8)
qj Four screws (BVTP 2.6x8)
9 Screw (BVTP 2.6x8)
qa Four screws
(BVTP 2.6x8)
5 Five claws
qf DOOR SW
board
qd Froating screw
(DIA.12)
0 BRACKET (S/P) (L)
qs CD-L board
8 Sub panel CD ASSY
qk CD-R board
qh BRACKET (S/P) (R)
4 Connector (CN600)
3 Connector (CN700)
6
7
3-9. VIDEO BOARD
2
1 Two screws
(BVTP 3 X 8)
4 Flat type wire
(CN201)
6 Two screws
(BVTP 3 X 8)
7 VIDEO board
3 Flat type wire (CN101
)
5 Connector (CN301)

12
HCD-XGV50
3-10. BACK PANEL, DC FAN (M901), MAIN BOARD
0 DC FAN
(M901)
1 Flat type wire (CN441)
7 Back panel
2 Seven screws
(BVTP 3 X 8)
5 Tow screws
(BVTP 3 X 8)
4 Three screws
(BVTP 3 X 8)
qf Two screws
(BVTP 3 X 8)
qg Two connectors
(CN901, 902)
3 Two screws
(BVTP 3 X 8)
9 Two screws
(BVTP 3 X 8)
8 Connector (CN961)
qa Flat type wire
(CN401)
qh MAIN board
6
qd
Connector
(CN721)
qs Connector (CN441)

13
HCD-XGV50
qa CD mechanism deck
(CDM37B-30BD62)
6 Two screws (BVTP 3 X 8)
5 Two screws
(BVTP 3 X 8)
4 Three screws
(BVTP 3 X 8)
1 Flat type wire
(CN401)
2 Connector
(CN411)
3 Four screws (BVTP 3 X 8)
Wire holder
0 Five screws
(BVTP3 × 8)
7
7
8
9 Remove two cables from
wire holder.
3-11. CD MECHANISM DECK (CDM37B-30BD62)

14
HCD-XGV50
3-13. BASE UNIT-2 (BU-30BD62)
1 Two floating screws (DIA.12)
6 Base unit (BU-30BD62)
2 Two screws
(BVTP 2.6 X 8)
3 Two stoppers
(BU)
5 Two coil
springs
(insulator
)
4 Two coil springs
(insulator)
Holder (BU30) assy
3-12. BASE UNIT-1 (BU-30BD62)
3 Base unit
(BU-30BD62)
1 BU fitting scre
w
2 Boss

15
HCD-XGV50
3-15. DISC TABLE
3-14. BD BOARD
Note: When the disc table is installed, adjust the positions of roller cam
and mark Bas shown in the figure, then set to the groove of disc
table.
1 Remove the two solders.
3 Flat type wire (CN102)
BU-30BD62
4 BD board
2 Remove the two solders.
1 Screw (BVTP 3 × 8)
2 Bracket (BU)
3 Step screw
4 Disc tabl
e
Roller cam
Cam (holder)
A
A

16
HCD-XGV50 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. Turn the power ON or set to the DEMO mode.
2. Press three buttons of x (TC-B) , TUNER ENTER , and \/1
simultaneously.
3. The set is reset, and displays “COLD RESET”, then becomes
DEMO mode.
[Change-over the AM Tuning Interval]
•The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the \/1 button to turn the power ON.
2. Select the function “TUNER”, and press the TUNER/BAND
button to select the BAND “AM”.
3. Press the \/1 button to turn the power OFF.
4. Press the TUNER ENTER and \/1 buttons simultaneously,
and the display on the fluorescent indicator tube changes to
“AM 9 K STEP” or “AM 10 K STEP”, and thus the tuning
interval is changed over.
[CD Ship Mode] (No memory clear)
•This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
1. Press the \/1 button to turn the power ON.
2. Press the EDIT and \/1 buttons simultaneously.
3. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD delivery mode is set.
[LED and Fluorescent Indicator Tube All Lit, Key Check
Mode]
Procedure:
1. Press three buttons of x (TC-B) , TUNER ENTER ,and
DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. Press the DISC 1 button, the MODE and DESTINATION are
displayed fluorescent indicator tube.
4. Each time the DISC 1 button is pressed, the MC/GC category
version is displayed in the following order.
5. Press the DISC 2 button, and the key check mode is acti-vated.
6. In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”. Each time a button is pressed, “K” value in-creases
to “K69”call the button is pressed. However, once a button is
pressed, it is no longer taken into account.
“V” value increases like 1, 2, 3 ... if turn the VOLUME dial
clockwise (“+” direction), or it decreases like 0, 9, 8 ... if turn
the VOLUME dial counterclockwise (“–” direction).
7. To release from this mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
NR MC GC CD CDDM CDMA
CDM
B
BDABDBSTTATMTC
[Sled Servo Mode] (CD service mode)
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pick-up.
Procedure:
1. Select the function “CD”.
2. Press three buttons x (TC-B) , TUNER ENTER , and
DISC 5 simultaneously.
3. The Sled Servo mode is selected, if “CD” is blanking on the
fluorescent indicator tube.
4. With the CD in stop status, press M button in CD section to
move the pick-up to outside track, or m button to inside track.
5. To exit from this mode, press \/1 button turn to the power
OFF.
Note:
•Always move the pick-up 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 FUNCTION Name]
•The FUNCTION name of external input terminal can be changed
over to VIDEO or MD. With the FUNCTION selected to “MD”,
about 5dB mute is applied to the input gain.
Procedure:
1. Press \/1 button to turn the power OFF.
2. Press \/1 button together with FUNCTION button for
several seconds, and the power is turned on, the display of
fluorescent indicator tube changes to “MD” or “VIDEO”
instantaneously, and thus the FUNCTION is changed over.
[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 display 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 FUNCTION 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 x (TC-B) , TUNER ENTER ,and
DISC 4 simultaneously.
5. The aging mode is activated, if the indicator of disc tray num-
ber on the fluorescent indicator tube is blinking.
6. To release from the aging mode, press the \/1 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.
[Changeover the color system]
The color system can be changed over PAL, NTSC or AUTO.
Procedure:
The color system can be changed over PAL, NTSC or AUTO by
pressing \/1 button while pressing followings and indication on
display changes to “COLOR PAL”, “COLOR NTSC” or “COLOR
AUTO”.
PAL:REGGAE + \/1
NTSC : MOVIE + \/1
AUTO : TANGO + \/1

17
HCD-XGV50
FWD the tape A
“TAPE A AG-2”
Fast forward the tape A
“TAPE A AG-3”
RVS the tape A
“TAPE A AG-4”
Rewind the tape A
“TAPE A AG-5”
FWD the tape B
“TAPE B AG-2”
Rewind the tape A
“TAPE A AG-1”
Fast forward the tape B
“TAPE B AG-3”
RVS the tape B
“TAPE B AG-4”
Rewind the tape B
“TAPE B AG-5”
Shut off
2 minutes
Shut off or 20 seconds
2 minutes
Shut off
2 minutes
Shut off or 20 seconds
2 minutes
Shut off
Aging mode sequence (Tape deck section):
2. Tape Deck Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Note: “TAPE *AG- *” is display of each step.
3. CD Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Aging mode sequence (CD section):
DISC 1
chucking
TOC Read
Track 1 Play
Tray Tun
Tray Turn
DISC 4
Chucking
2 seconds
Last Track Play
TOC Read
Track 1 Play
Last Track play
[VACS ON/OFF]
•The volume control by VACS is turned ON/OFF.
Procedure:
1. Press the \/1 button to turn the power ON.
2. Press the PLAY MODE and \/1 buttons simultaneously.
3. The reaction display appears when switcing ON/OFF.
2 seconds
2 seconds

18
HCD-XGV50
Torque Measurement
Mode Torque Meter Meter Reading
2.9~6.9 mN•m
FWD CQ-102C (30 to 70 g•cm)
(0.42 – 0.97 oz•inch)
FWD 0.19~0.59 mN•m
back tension CQ-102C (2 to 6 g•cm)
(0.03 – 0.08 oz•inch)
7.8~16.7 mN•m
FF/REW CQ-201B (80 to 170 g•cm)
(1.11 – 2.36 oz • inch)
SECTION 5
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer.
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 sup-
ply voltage unless otherwise noted.
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION 0 dB = 0.775 V
Precaution
1. Demagnetize the record/playback head with a head demagne-
tizer.
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 R-CH.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Set to the test mode.
(1) Press the \/1 button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of x (TC-B) , TUNER ENTER ,and DISC
3 simultaneously, to set the tape deck test mode
and displays “TEST MODE” on the fluorescent indicator
tube.
(4) To release from the test mode, press the \/1 button.
• Test Tape
Tape Signal Used for
P-4-A100 10 kHz, – 10 dB Azimuth Adjustment
WS-48B 3kHz, 0dB Tape Speed Adjustment

19
HCD-XGV50
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
set
MAIN board
MD (VIDEO) OUT jack (J701
)
L-CH, R-CH
+
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
3. Mode: Playback
set
test tape
P-4-A100
(10 kHz, – 10 dB)
R-CH
oscilloscope
L-CH
R-CH
VH
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good wrong
MAIN board
MD (VIDEO) OUT jack (J701)
L-CH
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
forward reverse
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. Tape Speed Adjustment
DECK B
Procedure:
Mode: Playback
set
MAIN board
MD (VIDEO) OUT jack (J701)
L-CH, R-CH
+
–
frequency counter
test tape
WS-48B
(3 kHz, 0 dB)
1. Insert the WS-48B into the deck B.
2. Press the H button on the deck B.
3. Adjust the tape speed adjustment control inside motor so that
frequency counter reads 3,000 ±90Hz.
Sample value of wow and flutter : W.RMS (JIS) less than 0.3%
WS-48B
Adjustment Location:
Tape speed Adjustment
Tape speed adjustment
control inside motor

20
HCD-XGV50
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 10MΩimpedance.
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
BD board
Oscilloscope
TP(FE)
TP(DVC)
Procedure :
1. Connect oscilloscope to TP (FE).
2. Connect between TP (FE) and TP (DVC ( 1.65 V)) by lead
wire.
3. Press the \/1 button to turn the power ON.
4. Load a disc (LUV-P01) and actuate the focus search. (In conse-
quence of open and close the disc tray, actuate the focus search)
5. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level within 2
±0.5 Vp-p.
symmetry
S-curve waveform
within 4
± 1Vp-p
A
B
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
Procedure :
1. Connect oscilloscope to TP (RFDC) and TP (RFAC).
2. Press the \/1 button to turn the power 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.
Note: Clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45
± 0.3Vp-p
E-F Balance (1 Track jump) Check
TP(TE)
TP(DVC)
BD board
oscilloscop
e
Procedure:
1. Connect oscilloscope to TP (TE) and TP (DVC) board.
2. Press the \/1 button to turn the power 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 oscillo-
scope waveform.
B=1.3 ± 0.6Vp-p symmetry
A (DC voltage
)
center of
waveform
B
0V
Specified level: ×100=less than – 22%
B
A
Checking Location:
[BD BOARD] (SIDE B)
DVC
RFDC
RFAC
TE
FE
SE
DVC
TP(RFDC)
TP(RFAC)
BD board
oscilloscope