Sony HCD-GSX100W - Mini Hi-fi Component System User manual

HCD-GSX100W
US Model
Canadian Model
SERVICE MANUAL
MiNi Hi-Fi COMPONENT SYSTEM
HCD-GSX100WistheAmplifier,CDplayer,Tape
Deck and Tuner section in MHC-GSX100W.
SPECIFICATIONS
Ver 1.2 2003.12
Model Name Using Similar Mechanism HCD-GS300AV
CD CD Mechanism Type CDM64C-K1BD47B
Section Base Unit Name BU-K1BD47B
Optical Pick-up Name KSM-213BFN
TAPE Model Name Using Similar Mechanism HCD-GS300AV
Section Tape Transport Mechanism Type CMAL1Z234A
— Continued on next page —
9-877-219-03
2003L02-1
© 2003.12
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
Main Unit
Amplifier section
For the U.S. model
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 6-ohm loads, both channels driven, from 120 – 10,000 Hz; rated 200
watts per channel minimum RMS power, with no more than 10% total
harmonic distortion from 250 milliwatts to rated output.
Continuous RMS power output (reference):
200 + 200 W(6 ohms at 1 kHz, 10%THD)
Total harmonic distortion less than 0.09% (6 ohms at 1 kHz, 125 W)
Inputs
VIDEO (MD) IN (phono jacks):
voltage 250/450 mV, impedance 47 kilohms
AUDIO IN (phono jacks):450 mV, impedance 47 kilohms
Outputs
VIDEO OUT (phono jacks):
max. output level 1Vp-p, unbalanced, Sync
negative, load impedance 75 ohms
PHONES (stereo phone jack):
accepts headphones of 8 ohms or more
SPEAKER: accepts impedance of 6 to 16 ohms
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser
(CD: λ=780 nm)
Emission duration: continuous
Frequency response CD: 20 Hz – 20 kHz (±0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
OPTICAL OUT (CD)
(Square optical connector jack, rear panel)
Wavelength 660 nm
Output level –18 dBm
Tape deck section
Recording system 4-track 2-channel stereo
Frequency response 40 – 13,000 Hz (±3dB),
using Sony TYPE I cassettes

2
HCD-GSX100W
1. SERVICING NOTES ······················································· 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
3-1. Top Cabinet ··································································· 8
3-2. Front Cabi ASSY ··························································· 8
3-3. Back Panel ASSY ·························································· 9
3-4. Detect Board, Main Board············································· 9
3-5. Amp Board ·································································· 10
3-6. Power Board ································································ 10
3-7. Holder (LED-S), Middle (R), Power Bracket ············· 11
3-8. CD Mechanism Deck (CDM64C-K1BD47B) ············ 11
3-9. Base Unit (BU-K1BD47B),
D-Sensor (OUT) Board, T-Sensor Board ···················· 12
3-10. D-Sensor (IN) Board, Load SW Board,
LT Motor Board ··························································· 12
3-11. CD LED Board ···························································· 13
3-12. BU Holder ASSY ························································ 13
3-13. CD Board, Optical Pick-up (KSM-213BFN) ·············· 14
3-14. RX-Base PC Board ASSY,
Mechanical Deck (CMAL1Z234A), Cassette Holder · 14
3-15. Game Board, H/P Board ·············································· 15
3-16. Display Board ······························································ 15
3-17. KEY (2) Board, CD Sync Button ································ 16
3-18. KEY Board, Wireless Board ········································ 16
4. TEST MODE ···································································· 17
5. MECHANICAL ADJUSTMENTS ····························· 18
6. ELECTRICAL ADJUSTMENTS ······························ 18
7. DIAGRAMS
7-1. Circuit Boards Location ·············································· 22
7-2. Block Diagrams ··························································· 23
– CD Section – ···························································· 23
– Tuner/Tape Deck Section – ······································ 24
– INPUT/EVR Section – ············································· 25
– Amp Section – ·························································· 26
– Display/Power Supply Section – ······························ 27
7-3. Printed Wiring Board – CD Section – ························ 28
7-4. Schematic Diagram – CD Section – ··························· 29
7-5. Printed Wiring Board
– CD Motor/Sensor Section – ····································· 30
7-6. Schematic Diagram
– CD Motor/Sensor Section – ····································· 31
7-7. Printed Wiring Board – Main Section – ····················· 32
7-8. Schematic Diagram – Main Section (1/3) – ··············· 33
7-9. Schematic Diagram – Main Section (2/3) – ··············· 34
7-10. Schematic Diagram – Main Section (3/3) – ··············· 35
7-11. Printed Wiring Board – Amp Section – ······················ 36
7-12. Schematic Diagram – Amp Section –························· 37
7-13. Printed Wiring Board – Display Section – ················· 38
7-14. Schematic Diagram – Display Section – ···················· 39
7-15. Printed Wiring Board – Key Section – ······················· 40
7-16. Schematic Diagram – Key Section – ·························· 41
7-17. Printed Wiring Board – Power Section – ··················· 42
7-18. Schematic Diagram – Power Section – ······················ 43
7-19. Printed Wiring Board – RX Section – ························ 44
7-20. Schematic Diagram – RX Section – ··························· 45
7-21. IC Block Diagrams ······················································ 46
7-22. IC Pin Function Description ········································ 48
8. EXPLODED VIEWS
8-1. General Section ··························································· 53
8-2. Front Panel Section ····················································· 54
8-3. Chassis Section ···························································· 55
8-4. Mechanism Deck Section-1 (CDM64C-K1BD47B) ··· 56
8-5. Mechanism Deck Section-2 (CDM64C-K1BD47B) ··· 57
8-6. Base Unit Section (BU-K1BD47B) ···························· 58
9. ELECTRICAL PARTS LIST ······································· 59
TABLE OF CONTENTS
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 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 – 1,710 kHz
(with the tuning interval set at 9 kHz)
Antenna AM loop antenna, external antenna terminal
Intermediate frequency 450 kHz
Transmitter
Carrier frequency 913.5 – 914.5 MHz
Channel
CHANNEL1: 913.5 MHz
CHANNEL2: 914.0 MHz
CHANNEL3: 914.5 MHz
Modulation FM stereo
Power source DC 9 V: supplied AC power adaptor
(AC-GSX100)
Audio input phono jacks/stereo mini jack
General
Power requirements: 120 V AC, 60 Hz
Power consumption: 170 W
Dimensions (w/h/d) incl. projecting parts and controls Amplifier/Tuner/
Tape/CD section: Approx. 280 x 326 x 490 mm
Transmitter Approx. 136 x 100 x 103 mm
Mass: Approx. 11.5 kg
Transmitter Approx. 146 g
Supplied accessories Remote (1)
size AA (R6) batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Transmitter (1)
AC adaptor (1)
Connecting cord phono
plug-stereo miniplug (1m) (1)
Design and specifications are subject to change without notice.
Ver 1.1 2003.09

3
HCD-GSX100W
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
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.
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µ F
AC
voltmete
r
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a
passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 VAC range are suitable. (See Fig. A)
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

4
HCD-GSX100W SECTION 1
SERVICING NOTES
CD-TEXT TEST DISC
This unit is able to display the test data (character information)
written in the CD on its fluorescent indicator tube.
The CD-TEXT TEST DISC (TGCS-313: J-2501-126-A) is used
for checking the display.
To check, perform the following procedure.
Checking Method:
1. Press the I/1button to turn the power on, set the disc to the
disc table with the “test disc” label facing right, and chuck the
disc.
2. Press the [CD] button to set CD function, and press the bB button to
playback the disc.
3. The following will be displayed on the liquid crystal display.
Display : 1KHZ/0dB/L R
4. Pressing the [-- ] or [ +] button, select the track. The text
data of each track will be displayed.
For details of the displayed contents for each track, refer to “Table
1: CD-TEXT TEST DISC TEXT Data Contents”.
Restrictions in CD-TEXT Display
In this unit, some special characters will not be displayed properly.
These will be displayed as a space or a character resembling it.
Table 1: CD-TEXT TEST DISC TEXT Data Contents
(TRACKS No. 1 to 20: Normal Characters)
11kHz/0dB/L&R
220Hz/0dB/L&R
340Hz/0dB/L&R
4100Hz/0dB/L&R
5200Hz/0dB/L&R
6500Hz/0dB/L&R
71kHz/0dB/L&R
85kHz/0dB/L&R
97kHz/0dB/L&R
10 10kHz/0dB/L&R
11 16kHz/0dB/L&R
12 18kHz/0dB/L&R
13 20kHz/0dB/L&R
14 1kHz/0dB/L&R
15 1kHz/–1dB/L&R
16 1kHz/–3dB/L&R
17 1kHz/–6dB/L&R
18 1kHz/–10dB/L&R
19 1kHz/–20dB/L&R
20 1kHz/–60dB/L&R
TRACK
No. Displayed Contents
Note: Track No. 21 to 99 are not displayed.
.>
CLEANING OBJECTIVE LENS OF OPTICAL PICK-UP
•In cleaning the objective lens of optical pick-up, be sure the
following below.
(Figure A)
Note 1. In cleaning the lens, do not apply an excessive force.
As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.
Note 2. In cleaning, do not use a cleaner other than exclusive cleaning
liquid (KK-91 or isopropyl alcohol).
Note 3. Wipe the objective lens spirally from center toward outside. (See
Figure A)
2 Remove the
magnet assy.
1 Open the torsion holder
(magnet) in direction of
arrow
A .
A
optical pick-up
bracket (top 60) hole
3 Put a cotton bud into
the hole on the bracket
(top 60) and clean the
OP lens.

5
HCD-GSX100W
SECTION 2
GENERAL This section is extracted
from instruction manual.
MAIN UNIT
ALPHABETICAL ORDER
A – H
ALBM + qs
ALBM – wk
AUDIO IN jack w;
CD wj
CD SYNC 0
CLEAR wl
DISC SELECT ws
DISPLAY 7
Display window 2
ENTER e;
FM MODE/REPEAT 9
GAME qg
GAME MIXING qa
I – Z
ILLUMINATION 6
KEYBOARD INPUT jack ql
MENU ea
PHONES jack qk
PLAY MODE/DIRECTION 8
POWER ILLUMINATOR wd
Remote sensor es
TAPE qd
Tape deck 3
TUNER/BAND wh
VIDEO (MD) qf
VIDEO IN jack wa
VOLUME wf
WIRELESS wg
BUTTON DESCRIPTIONS
?/1(power) 1
ZPUSH (tape deck) 3
nN (play) 4
X(pause) 4
x(stop) 4
REC PAUSE/START 5
ZPUSH (front cover) qh
m(rewind) qj
M(fast forward) qj
.(go back) qj
>(go forward) qj

6
HCD-GSX100W
REMOTE CONTROL
ALPHABETICAL ORDER
A – Q
ALBM +/– qfwa
CD wl
CLEAR 0
CLOCK/TIMER SELECT 2
CLOCK/TIMER SET 3
DISC +/– qgw;
DISPLAY qa
ENTER wg
GAME wj
GAME MIXING 9
GROOVE qj
MENU wh
PLAY MODE 6
PRESET +/– qswd
PRESET EQ qh
R – Z
REPEAT 8
SLEEP 1
SURROUND ql
TAPE 5
TUNER/BAND e;
TUNING +/– qdws
VIDEO (MD) wk
VOL +/– qk
WIRELESS 7
BUTTON DESCRIPTIONS
?/1(power) 4
nN (play) wf
X(pause) wf
x(stop) wf
.(go back) wd
m(rewind) ws
M(fast forward) qd
>(go forward) qs
This section is extracted
from instruction manual.

7
HCD-GSX100W
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
TOP CABINET
FRONT CABI ASSY
BACK PANEL ASSY
RX-BASE PC BOARD ASSY
MECH
DECK (CMAL1Z234A),
CASSETTE HOLDER
SET
AMP BOARD
DISPLAY BOARD
KEY BOARD, WIRELESS BOARD
CD LED BOARD
HOLDER (LED-S),
MIDDLE(R) BRACKET ,
POWER BRACKET
CD MECHANISM DECK
(CDM64C-K1BD47B)
GAME BOARD, H/P BOARD
DETECT BOARD, MAIN BOARD
BU HOLDER ASSY
CD BOARD,
OPTOCAL PICK-UP (KSM-213BFN)
BASE UNIT (BU-K1BD47B),
D-SENSOR (OUT) BOARD,
T-SENSOR BOARD
D-SENSOR (IN) BOARD,
LOAD SW BOARD,
LT MOTOR BOARD
POWER BOARD
KEY(2) BOARD, CD SYNC BUTTON
Ver 1.1 2003.09

8
HCD-GSX100W
3-2. FRONT CABI ASSY
Note: Follow the disassembly procedure in the numerical order given.
3-1. TOP CABINET
9 Three screws
(BVTP3
× 10)
qd
5
Three screws
(BVTP3
× 10)
7
1
Three screws
(BVTP3
× 10)
2 Two screws
(BVTP3
× 10)
6 Two screws
(BVTP3
× 10)
4 Panel side (R)
8 Panel side (L)
3
qf
Top cabinet
qs Connector (CN441)
qa Wire (Flat type) (CN309 )
0 Connecter (CN101 )
1 Connector (CN358)
2 Connector (CN705)
7 Connector (CN310)
6 Connector (CN306)
8 Screw (BVTP3 × 8)
0 Four screws
(BVTP3
× 8)
qs Screw (KTP3 × 8)
qa Screw (KTP3 × 8)
9 Screw (BVP3 × 8)
qf Front cabi ASSY
3 Wire (Flat type) (CN720)
4 Wire (Flat type)
(CN316)
5 Wire (Flat type)
(CN314)
Lugs
Lugs
qd

9
HCD-GSX100W
3-4. DETECT BOARD, MAIN BOARD
3-3. BACK PANEL ASSY
3 Two screws (BVTP 3x10)
7 Three screws (BVTP 3x10)
5 Two screws (BVTP 3x10)
qa Two screws (BVTP 3x10)
8 Four screws (BVTP 3x10)
0 Four screws (BVTP 3x10
)
9 Screw (BVTP 3x10)
6 SPK board
qs Back panel ASSY
4 DC Fan (M351)
1 Connector (CN356)
2 Connector (CN351)
0 Screw
(BVTP3 × 8)
qa Screw
(BVTP3 × 8)
9 Screw
(BVTP3 × 8)
qs MAIN board
2 DETECT board
1 Remove six solders
(CNP315)
8 Connector (CN301)
3 Connector (CN354)
6 Connector (CN308)
7 Connector (CN307)
4 Wire (Flat type)
(CN305)
5 Wire (Flat type)
(CN311)
Lug
Lug

10
HCD-GSX100W
3-6. POWER BOARD
3-5. AMP BOARD
3 Two screws (BVTP3 × 8
)
4 Two screws (BVTP3 × 8)
2 Two screws
(BVTP3
× 8)
5 AMP board
1 Connector (CN353)
3 POWER boar
d
2 Two screws
(BVTP4
× 8)
1 Two screws
(BVTP4
× 8)
Lug

11
HCD-GSX100W
3-8. CD MECHANISM DECK (CDM64C-K1BD47B)
3-7. HOLDER (LED-S), MIDDLE (R) BRACKET, POWER BRACKET
2 Holder (LED-S)
5 Middle (R) bracket
1 Two screws
(BVTP3
× 8)
7 Two screws
(BVTP3
× 8)
4 Two screws
(BVTP3
× 8)
6 screw (BVTP3 × 8)
9 Power bracke
t
3 Three screws
(BVTP3
× 8)
8 Three screws
(BVTP3
× 8)
2 Ta b le (60)
Lower chassis
1 Screw (M3 × 12)
7 CD mechanism deck
(CDM64C-K1BD47B)
4 Two screws
(BVTP3
× 8
)
3 Screw
(PSW3
× 6)
6 Four screws
(BVTP3
× 8)
5 Four screws
(BVTP3
× 8)
Ver 1.1 2003.09

12
HCD-GSX100W
3-10. D-SENSOR (IN) BOARD, LOAD SW BOARD, LT MOTOR BOARD
3-9. BASE UNIT (BU-K1BD47B), D-SENSOR (OUT) BOARD,T-SENSOR BOARD
1 Three screws
(BVTP3
× 8)
6 Three screws
(BVTP3
× 8)
4 Screw (BVTP3 × 8)
2 Bracket (top 60)
5 D-SENSOR (OUT) board
7 T-SENSOR board
3 Base unit
(BU-K1BD47B)
Pulley (60)
Motor (60) ASSY (M442)
Motor (60) ASSY (M441)
* Cautions of an assembly
5 Belt
6 Belt
3 Two screws
(BVTP3
× 8)
1 Screw (BVTP3 × 8)
9 Screw (BVTP3 × 8)
4 D-SENSOR (IN) board
8 LT MOTOR board
0 LOAD SW board
2 Brackcet (d-sensor)
7 Three screws
(BVTP3
× 8)

13
HCD-GSX100W
3-12. BU HOLDER ASSY
3-11. CD LED BOARD
3 CD LED board
Opens to right and left and
CD LED BOARD
is removed upwards
from a slot.
1
2
5 BU holder ASSY
1 Tension spring (F1)
2 Tension spring (F-2)
3 Two screws
(PTP2.6 × 8
)
4 Two screws
(PTP2.6 × 8)

14
HCD-GSX100W
3-14. RX-BASE PC BOARD ASSY, MECHANICAL DECK (CMAL1Z234A), CASSETTE HOLDER
3-13. CD BOARD, OPTICAL PICK-UP (KSM-213BFN)
1 Remove two
solders.
6 CD board
5 Wire (Flat type)
(CN102)
7 Optical pick-up (KSM-213BFN)
3 Screw (P2 × 5)
2 Remove two solders.
4
Lug
0 D amper
2 TMR plat
e
6 Mech deck (CMAL1Z234A)
qs Cassette holder
4 RX-BASE PC board ASSY
9 Cassette spring
qa
7
8
1 Tow screws
(BVTP3
× 8)
5 Four screws
(BVTP3
× 8)
3 Screw
(BVTP3
× 8)
Ver 1.1 2003.09

15
HCD-GSX100W
3-15. GAME BOARD, H/P BOARD
3-16. DISPLAY BOARD
1 Two screws
(BVTP2.6
× 8)
3 Two screws
(BVTP2.6
× 8)
2 GAME board
5 H/P board
4 Retainer H/P
Wire retainer pwb Harness
Front cabinet
4 Three screws
(BVTP2.6 × 10)
3 Wire (Flat type) (CN714 )
2 Connector (CN713)
1 Connector (2p)
SW701

16
HCD-GSX100W
3-18. KEY BOARD, WIRELESS BOARD
3-17. KEY (2) BOARD, CD SYNC BUTTON
1 Two screws
(BVTP2.6
× 8)
5 Two screws
(BVTP3 × 10
)
4 Screw(BVTP3 × 10)
6 CD sync button
2 KEY (2) board
3 Connector (CN706)
1 Disc knob
3 Volume knob
2 Three claws
4 Nut
5 Washer
6 Volume rubber
8 Volume indicator
7 Volume cover
qa KEY board
qf WIRELESS board
0 Three screws
(BVTP3
× 10)
9 Four screws
(BVTP3
× 10)
qd Two screws
(BVTP3
× 10)
qs Connecter (CN703
)

17
HCD-GSX100W
[Panel Test Mode]
Procedure:
1. Press three buttons of x, [MENU], and [DISPLAY] simulta-
neously.
2. LEDs and fluorescent indicator tube are all turned on.
3. Press the [MENU] button and go to the version display mode.
Press the mbutton and go to the key and jog test mode.
4. To release from these mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
– Version display mode –
In the version display mode, each time the [MENU] button is
pressed, the display changes in the order of MC, GC, CD, CDD,
CDM A, CDM B, BDA, BDB, ST, TA, TM and TC.
Press the .button to display the date of the software.
– Key and jog test mode –
In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”. Each time a button is pressed, “K” value in-
creases without I/1and [DISPLAY] buttons. However, once
a button is pressed, it is no longer taken into account.
“J” value increases like 1, 2, 3 ... if turn the [DISC SELECT]
dial clockwise, or it decreases like 0, 9, 8 ... if turn the
[DISC SELECT] dial counterclockwise.
“V” value increases like 1, 2, 3 ... if turn the [VOLUME] knob
clockwise, or it decreases like 0, 9, 8 ... if turn the [VOLUME]
knob counterclockwise.
[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, [CLEAR], and [DISPLAY] simul-
taneously.
3. The set is reset, and becomes DEMO mode.
[CD Ship Mode and RAM Initialize]
•This mode moves the optical pick-up to the position durable to
vibration, and initializes the RAM. Use this mode when return-
ing the set to the customer after repair.
Procedure:
1. Press the I/1button to turn the power ON and select the func-
tion CD.
2. Press three buttons of [ENTER],[REPEAT], and Xsimul-
taneously.
3. The set is turn the power off and initializes the RAM auto-
matically. A message “LOCK” is displayed on the fluorescent
indicator tube, and the CD delivery mode is set.
[AM Channel Step 9 kHz/10 kHz Selection Mode]
•The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the I/1button to turn the power on.
2. Select the function “TUNER”, and press the [TUNER/BAND]
button to select the BAND “AM”.
3. Press the I/1button to turn the power off.
4. Press the [ENTER] and I/1buttons simultaneously.
5. Either the message “AM 9k STEP” or “AM 10k STEP” ap-
pears, and thus the channel step is changed over.
SECTION 4
TEST MODE
[CD Service Mode]
•This mode can run the CD sled motor optionally. Use this mode,
for instance, when cleaning the optical pick-up.
Procedure:
1. Press the I/1button to turn the power ON.
2. Select the function “CD”.
3. Press three buttons of [ENTER],M, and
[PLAY MODE] simultaneously.
4. Set to the Sled Servo mode.
5. With the CD in stop status, press the Mbutton to move the
optical pick-up to outside track and display “SLED OUT”, or
press the mbutton to move the optical pick-up to inside
track and display “SLED IN”.
6. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Press three buttons of x, [CLEAR], and [DISPLAY]
simultaneously. (cold reset)
Notes: •Always move the optical 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.
[VACS Test Mode]
•This mode is used to switch on and off the VACS (Variable At-
tenuation Control System).
Procedure:
1. Press the I/1button to turn the set on.
2. To enter the test mode, press the two buttons [ENTER] , [PLAY
MODE] and Xsimultaneously.
3. The message “VACS OFF” or “VACS ON” appears.
4. To exit from this mode, press the I/1button to turn the set
off.
[Function Selection Mode]
•This mode is used to select the input VIDEO or input MD.
Procedure:
1. Turn off the set.
2. Press the two buttons xand [VIDEO $MD%] simultaneously.
3. The message “VIDEO” or “MD” appears.
4. To exit from this mode, press the I/1button to turn the set
off.

18
HCD-GSX100W
SECTION 5
MECHANICAL ADJUSTMENTS
•TAPE MECHANISM DECK SECTION
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 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
supply voltage unless otherwise noted.
Torque Measurement
2.44 mN • m to 8.33 mN • m
30 to 85 g • cm
(0.42 – 1.17 oz • inch)
0.14 mN • m to 0.59 mN • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
2.94 mN • m to 7.84 mN • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
6.86 mN • m to 20.6 mN • m
71 to 210 g • cm
(0.98 – 2.91 oz • inch)
Mode Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-201B
Meter reading
FWD
FWD /REV
back tension
REV
FF/REW
SECTION 6
ELECTRICAL ADJUSTMENTS
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 ad-
justment 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.
•Test Tape
Tape Signal Used for
P-4-A100 10 kHz, – 10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Check
0 dB = 0.775 V
DECK SECTION

19
HCD-GSX100W
Tape Speed Check
Mode: Playback
1. Insert the WS-48B into the deck.
2. Press the bB button on the deck.
3. Confirm that the frequency counter reads 3,000 ±90 Hz.
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
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.
3. Mode: Playback
4. Reapeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
parts adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
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
SPK board
SPEAKER terminal (J357)
L-CH
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
SPK board
SPEAKER terminal (J357)
L-CH, R-CH
frequency counter
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback (FWD)
set
SPK board
SPEAKER terminal (J357
)
L-CH, R-CH
+
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
Adjustment Location: Record/Playback/Erase Head
Head azimuth
adjustment screw

20
HCD-GSX100W
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) 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
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (FE1) and TP (DVC)
on the CD board.
2. Turn the power on.
3. Put the disc (YEDS-18) in and turned power switch on again
and actuate the focus search. (actuate the focus search when
disc table is moving in and out)
4. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2 ±1
Vp-p.
S-curve waveform
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.
Checking Location: CD board (Conductor side)
(See page 21.)
+
–
CD board
TP (FE1)
TP (DVC)
oscilloscope
A
B
symmetry
within 2
± 1 Vp-p
RFAC Level Check
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (RFAC) and TP (DVC)
on the CD board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
Note: A clear RFAC signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
RFAC signal waveform
Checking Location: CD board (Conductor side)
(See page 21.)
+
–
CD board
TP (RFAC)
TP (DVC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.35 ± 0.4 Vp-p