Sony HCD-GX450 - Stereo Mini System User manual

SERVICE MANUAL
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
HCD-GX450
US Model
Canadian Model
MINI HI-FI COMPONENT SYSTEM
9-877-534-03
2005H16-1
© 2005.08
•HCD-GX450 is the tuner, deck, CD and
amplifier section in MHC-GX450.
SPECIFICATIONS
Ver. 1.2 2005.08
Amplifier section
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 6 ohm loads, both channels driven, from
120 – 10,000 Hz: rated 125 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.
Front speaker
Continuous RMS power output (reference):
125 + 125 watts (6 ohms at
1 kHz, 10% THD)
Total harmonic distortion less than 0.07% (6 ohms at
1kHz,60 W)
Sub woofer
Continuous RMS power output (reference):
150 watts (6 ohms at
50 Hz, 10% THD)
Total harmonic distortion less than 0.07% (6 ohms at
50 Hz, 75 W)
CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
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
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
(100-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 – 1,710 kHz
(with the tuning interval
set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements 120 V AC, 60 Hz
Power consumption
USA models: 265 watts
Canadian models: 330 VA
Dimensions (w/h/d) incl. projecting parts and controls
Amplifier/Tuner/Tape/CD section:
Approx. 280 ×327 ×
425 mm
Mass Approx. 10.0 kg
Design and specifications are subject to change
without notice.
Former Type Models New Type Models
Model Name Using Similar Mechanism New New
CD CD Mechanism Type CDM74-F1BD81
CDM74KF-K6BD81C
Section Optical Pick-up Name
KSM-215DCP/C2NP KSM-213DCP/C2NP
Tape deck Model Name Using Similar Mechanism New New
Section Tape Transport Mechanism Type CWM43FF-05 CWM43FF-05

2
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.
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.
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Checktheantennaterminals, metaltrim, “metallized”knobs, screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE
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-operatedAC 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 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
HCD-GX450
The release method of a CD disc tray LOCK function
There is a disc lock function for the disc theft prevention for a
demonstration at a shop front in this machine.
Procedue:
1. Press the ?/1 button to turn the set on.
2. Press two buttons of xand Z(EJECT) simultaneously for
five seconds.
3. The message “LOCKED” is displayed and the tray is locked.
(Even if exiting from this mode, the tray is still locked.)
4. Press two buttons of xand Z(EJECT) simultaneously for
five seconds again.
5. The message “UNLOCKED” is displayed and the tray is
unlocked.
6. To exit from this mode, press the ?/1 button to turn the set
off.
To Exposed Metal
Parts on Set
0.15 µF1.5 kΩ
AC
Voltmeter
(0.75V)
Earth Ground
Fig.A. Using an AC voltmeter to check AC leakage.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

3
HCD-GX450
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
otherthan thosespecifiedhereinmay resultin hazardous radiation
exposure.
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of soldering iron around 270˚C
during repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering
or unsoldering.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
TABLE OF CONTENTS
1. SERVICING NOTE ·························································· 4
2. GENERAL ·········································································· 6
3. DISASSEMBLY
3-1. Cover (Top) ····································································· 9
3-2. CD Door·········································································· 9
3-3. Front Panel Section ······················································· 10
3-4. CD Mechanism Deck (CDM74-F1BD81) ···················· 10
3-5. Tape Mechanism Deck, Game Jack Board ··················· 11
3-6. PANEL Board ······························································· 11
3-7. Back Panel Section, SUB-TRANS Board ···················· 12
3-8. Power Transformer······················································· 12
3-9. MAIN Board ································································· 13
3-10. SUB-WOOFER Board················································ 13
3-11. AMP Board ································································· 14
3-12. BD81A Board ····························································· 14
3-13. CONNECT Board······················································· 15
3-14. DRIVER Board, SW Board ········································ 15
3-15. Optical Pick-up (KSM-215DCP/C2NP) ····················· 16
3-16. SENSOR Board ·························································· 16
3-17. MOTOR (TB) Board··················································· 17
3-18. MOTOR (LD) Board ·················································· 17
4. TEST MODE···································································· 18
5. DIAGRAMS
5-1. Block Diagrams – PANEL Section – ···························· 22
– MAIN Section – ······················································· 23
– BD/DRIVER Section – ············································ 24
– SUB-WOOFER Section – ········································25
5-2. Printed Wiring Board – BD81A Section –··················· 26
5-3. Schematic Diagram – BD81A Section – ····················· 27
5-4. Printed Wiring Board
– CD MECHANISM Section – ···································28
5-5. Schematic Diagram – CD MECHANISM Section –··· 29
5-6. Printed Wiring Board – MAIN Section – ···················· 30
5-7. Schematic Diagram – MAIN Section (1/2) – ·············· 31
5-8. Schematic Diagram – MAIN Section (2/2) – ·············· 32
5-9. Printed Wiring Board – PANEL COMB Section – ······ 33
5-10. Schematic Diagram – PANEL COMB Section – ······ 34
5-11. Printed Wiring Board – SUB-WOOFER Section – ··· 35
5-12. Schematic Diagram
– SUB-WOOFER Section – ········································36
5-13. Printed Wiring Board – PANEL Section –················· 37
5-14. Schematic Diagram – PANEL Section (1/2) – ·········· 38
5-15. Schematic Diagram – PANEL Section (2/2) – ·········· 39
5-16. Printed Wiring Board – TRANS Section – ················ 40
5-17. Printed Wiring Board – AMP Section –····················· 41
5-18. Schematic Diagram – AMP POWER Section – ········ 42
5-19. IC Pin Function Description ······································· 46
6. EXPLODEDVIEWS
6-1. MAIN Section······························································· 51
6-2. Front Panel Section ······················································· 52
6-3. MAIN Board Section ···················································· 53
6-4. CD Mechanism Deck Section -1 (CDM74-F1BD81)··· 54
6-5. CD Mechanism Deck Section -2 (CDM74-F1BD81)··· 55
7. ELECTRICAL PARTS LIST······································· 56

4
HCD-GX450 SECTION 1
SERVICING NOTE
•SERVICE POSITION -1 (AMP BOARD)
front panel
CD mechanism deck
AMP boar
d
To inspect the AMP board, turn both of the front panel
and the CD mechanism deck so that the left side of the product faces down.

5
HCD-GX450
•SERVICE POSITION -2 (BD81A BOARD)
BD81A board
CD mechanism dec
k
Remove the CD mechanism deck and place it on top of the pedestal as shown.
Inspect the BD81A bard in this set up.

6
HCD-GX450 SECTION 2
GENERAL
Main unit
ALBUM +
ALBUM –
qh (12, 14, 19)
wg (12, 14, 19)
CD eg (9, 11, 14, 19, 20)
CD SYNC wj (19)
Deck A wk (18)
Deck B qj (18, 19, 20, 24)
DISC 1 – 3 q; (12, 14, 35)
DISC SKIP/EX-CHANGE qs
(11, 12, 14, 19)
Disc tray 9(11)
DISPLAY 2(17, 27, 28)
Display window 5
EFFECT ON/OFF 8(22)
ENTER qa (14, 15, 22)
EQ BAND 7(22)
GAME es (20, 23, 30)
GAME INPUT AUDIO L/R jacks
wd (20, 29)
GAME INPUT VIDEO jack wf
(29)
GAME MIXING wh (23)
GROOVE 8(21)
ILLUMINATION 3(28)
Operation Dial
(– EQ +/l L) 6(12,
14, 19, 22)
P FILE qd (22)
PHONES jack ql
PLAY MODE wl (12, 14, 18, 19,
20, 35)
Power illuminator qk (28)
PRESET EQ qd (22)
REC PAUSE/START wj (19, 20,
23, 24)
Remote sensor 4
SURROUND 8(23)
TAPE A/B ed (18, 19, 20, 24)
TUNER/BAND ef (15, 16, 20)
TUNING MODE wl (15, 16, 35)
TUNING + qh (15, 16)
TUNING – wg (15, 16)
VOLUME control w; (21)
?/1 (power)1(8,16,27, 30, 33,
35)
X(pause) wg (12, 19)
Z(eject) qf (11)
PUSH Z(deck B) (eject) qg (18)
x(stop) wg (12, 19, 24, 35)
M(fast forward) qh (12, 19)
H(play) qh (12, 18, 19)
m(rewind) wg (12, 19)
ZPUSH (deck A) (eject) e; (18)
List of button locations and reference pages
How to use this page
Use this page to find the location of buttons and other
parts of the system that are mentioned in the text.
Ill
us
t
ra
ti
on num
b
er
r
TAPE A/B ed (18, 19, 20, 24)
RR
Name of button/part Reference page
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
ALBUM
ALBUM
TUNING TUNING
J
H
h
S
j
s
wd
12345 6 78 9
q;
qf
qa
qs
qd
w;
ql
qg
qh
qk
wfwg
wh
wk
wj
wl
es
ef
ed
eg
e;
qj

7
HCD-GX450
Use buttons on the remote for the operation.
1 Press ?/1 to turn on the system.
2 Press CLOCK/TIMER SET.
3 Press .or >repeatedly to set the
hour.
4 Press ENTER.
5 Press .or >repeatedly to set the
minute.
6 Press ENTER.
The clock starts working.
To adjust the clock
1 Press CLOCK/TIMER SET.
2Press .or >repeatedly to select
“CLOCK SET”, then press ENTER.
3Do the same procedures as step 3 to 6
above.
Notes
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
Setting the clock
Remote control
ALBUM – qd (12, 14)
ALBUM + qa (12, 14)
CD qk (11, 14)
CLEAR qg (14)
CLOCK/TIMER SELECT 2
(26, 27)
CLOCK/TIMER SET 3(10, 25,
26)
DISC SKIP q; (12, 14)
DISPLAY wa (17, 27, 28)
ENTER 9(10, 14, 15, 25, 26)
EQ qf (22)
?/1 (power) 1(8, 26)
m/M (rewind/fast forward)
7(12, 19)
–/+ (tuning) qh (15)
./> (go back/go forward)
qh (10, 12, 19)
N(play) 8(12, 18)
X(pause) 8(12, 19)
x(stop) 8(12, 19)
ALPHABETICAL ORDER
A – E
FM MODE 4(17)
FUNCTION 6(11, 14, 15, 16)
PLAY MODE w; (12, 14, 18)
REPEAT 4(13)
SLEEP ws (25)
TAPE qj
TUNER BAND 5(15, 16)
TUNER MEMORY ql (15)
TUNING MODE w; (15, 16)
VOLUME +/– qs (21, 25)
F – Z
BUTTON DESCRIPTIONS
4
5
6
7
8
9
q;
ws 1
qd
qg
qf
wa
w;
ql
qk
qj
qh
qa
qs
3
2

8
HCD-GX450 SECTION 3
DISASSEMBLY
Note: Disassemble the unit in the order as shown below.
3-1.COVER (TOP)
(Page 9)
3-2.CD DOOR
(Page 9)
3-3.FRONT PANEL SECTION
(Page 10)
3-8.POWER TRANSFORMER
(Page 12)
3-7.BACK PANEL SECTION,
SUB-TRANS BOARD
(Page 12)
3-4.CD MECHANISM DECK
(CDM74-F1BD81)
(Page 10)
3-15.OPTICAL PICK-UP
(KSM-215DCP/C2NP)
(Page 16)
3-5.TAPE MECHANISM DECK,
GAME JACK BOARD
(Page 11)
3-14.DRIVER BOARD,
SW BOARD
(Page 15)
3-17.MOTOR (TB) BOARD
(Page 17)
3-18.MOTOR (LD) BOARD
(Page 17)
3-16.SENSOR BOARD
(Page 16)
3-12.BD81A BOARD
(Page 14)
3-6.PANEL BOARD
(Page 11)
3-9.MAIN BOARD
(Page 13) 3-10.SUB-WOOFER BOARD (Page 13)
3-11.AMP BOARD
(Page 14)
3-13.CONNECT BOARD
(Page 15)
SET

9
HCD-GX450
Note: Follow the disassembly procedure in the numerical order given.
3-1. COVER (TOP)
3-2. CD DOOR
cover (Side-R)
cover (Side-L)
5
qd
qs
qs
q;
qf
cover (top)
6 two screws (Case 3 TP2)
8 screw
(+BVTP 3
× 10 )
3 screw
(+BVTP 3
× 10 )
9 screw
(+BVTP 3
× 10 )
4 screw
(+BVTP 3
× 10 )
1 two screws
(case 3 TP2)
qa two screws (+BVTP 3 × 10)
7 screw (case 3 TP2)
2 screw (Case 3 TP2)
2 Pull-out the disc tray.
1 Turn the pulley to the direction of arrow.
3 two claws
4 CD door
pulley
Front panel side
CD mechanism deck (CDM74)

10
HCD-GX450
3-4. CD MECHANISM DECK (CDM74-F1BD81)
3-3. FRONT PANEL SECTION
1 three screws (+BVTP 3 × 8 )
qd front panel section
7 wire (flat type) 29 core (CN302)
8 wire (flat type) 17 core (CN253)
9 connector 5p (CN309)
qs connector 8p (CN103)
3 screw (+BVTP 3 × 10)
2 screw (+BVTP 3 × 10)
4 screw (+BVTP 3 × 8 )
5 screw (+BVTP 3 × 8 )
0 connector 3p (CN304C)
qa connector 3p (CN102B)
6 connector 2p (CN805)
2 connector 12p (CN701)
3 connector 9p (CN254)
4 CD mechanism deck (CDM74-F1BD81)
1 three screws (+BVTP 3 × 10
)

11
HCD-GX450
3-5.TAPE MECHANISM DECK, GAME JACK BOARD
3-6. PANEL BOARD
2 six screws
(+BVTP 2.6
× 8
)
5 GAME JACK board
4 two screws
(+BVTP 2.6
× 8)
3 tape mechanism deck
1 wire (flat type) 13 core (CN602)
1 ten screws
(+BVTP 2.6
× 8
)
5 PANEL board
4 connector 5p (CN605)
3 connector 6p (CN604)
2 seven claws

12
HCD-GX450
3-7. BACK PANEL SECTION, SUB-TRANS BOARD
3-8. POWER TRANSFORMER
3 connector
3p (CN308)
1 connector
2p (CN904)
7 connector
2p (CN901)
8 SUB-TRANS board
4 two screws
(+BVTP 3 × 10
)
5 three screws
(+BVTT 3 × 10)
6 two screws
(+BVTT 3 × 10 )
9 back panel section
2 wire (flat type) 11 core (CN101)
1 connector
3p (CN905)
2 connector
10p (CN907)
4 earth wire
5 four screws
(+ITC 4 × 8 )
3 screw
(+BVIT 3 × 8R )
6 power transforme
r

13
HCD-GX450
3-9. MAIN BOARD
3-10. SUB-WOOFER BOARD
1 connector
7p (CN502)
4 SUB-WOOFER boar
d
2 two screws
(transistor)
3 two screws
(+BVTP 3 × 8 )
5 MAIN boar
d
3 two screws
(+BVTP 3
× 8 )
1 connector
10p (CN907)
4 connector
13p (CN441)
2 connector
4p (CN501)
Main board

14
HCD-GX450
3-11. AMP BOARD
3-12. BD81A BOARD
6 AMP board
1 two screws
(+BVTP 3
× 8
)
5 heat sink
2 screw
(+BVTP 3
× 14)
4 two screws
(transistor)
3 two screws
(+BVIT 3
× 8R )
5 BD81A board
3 screw
(+BVTP 2.6 × 8 )
1 wire (flat type) 27 core (CN202)
4 Remove soldering from the four points.
2 wire (flat type) 16 core (CN101
)

15
HCD-GX450
3-13. CONNECT BOARD
3-14. DRIVER BOARD, SW BOARD
3 CONNECT board
1 wire (flat type) 27 core (CN251)
2 two screws
(+BVTP 2.6
× 8 )
3 connector
4p (CN703)
4 DRIVER board
6 SW board
2 wire (flat type) 5p (CN702)
1 two screws
(+BTTP (M2.6))
5 screw
(+BTTP (M2.6))

16
HCD-GX450
3-15. OPTICAL PICK-UP (KSM-215DCP/C2NP)
3-16. SENSOR BOARD
5 two coil springs
(insulator)
9 two coil springs
(insulator)
6 two insulators
0 two insulators
qs s crew (+BVTP 2.6x 8)
7 t wo screws
(BVTT M2.6)
3 screw
(BVTT M2.6)
2 h older (213) ASSY
8 t wo stoppers (BU)
qd Remove the four solderings of motor.
qf CN101 (flat type)
qg B D81A board
qh optical pick-up
(KSM-215DCP/C2NP)
1 floating screw
(+PTPWH M2.6)
4 floating screw
(+PTPWH M2.6)
qa
2 t ray
3 b elt (table)
5 p ulley (table)
8 s crew
(+BTTP (M2.6))
0 SENSOR board
7 g ear (geneva)
9 connector
(
CN731)
1 floating screw
(+PTPWH M2.6)
6 floating screw
(+PTPWH M2.6)
4 floating screw
(+PTPWH M2.6)

17
HCD-GX450
3-17. MOTOR (TB) BOARD
3-18. MOTOR (LD) BOARD
6 Remove the two solderings of motor.
7 MOTOR (TB) board
5 t able motor assy (M741)
5 two screws
(+BTTP (M2.6))
4
3
wire (flat type) 5 core (CN742)
1 stopper
2 stopper
4 Remove the two solderings of motor.
3 MOTOR (LD) board
1 b elt (loading)
5 l oading motor assy (M751)
2 two screws
(+BTTP (M2.6))

18
HCD-GX450 SECTION 4
TEST MODE
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
•Astep ofAM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND
button to select the BAND “AM”.
3. Press ?/1button to turn the set OFF.
4. Press PLAY MODE/TUNING MODE and ?/1buttons si-
multaneously, 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.
[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, PLAY MODE/TUNING MODE ,
and DISC 1 simultaneously.
2. The fluorescent indicator tube displays “COLD RESET” and
the set is reset.
[Aging Mode]
This mode can be used for operation check of CD section and tape
deck section.
•If an error occurred:
The aging operation stops and is displayed status.
•If no error occurs:
The aging operation continues repeatedly.
1. Operating method of Aging Mode
Press ?/1buttonto turn the set ONand select“CD” ofthe function.
1) Set three discs in tray. Press the PLAY MODE/TUNING MODE
button to set the “ALL DISCS” mode, and the PRESET EQ
button to “REPEAT” off.
2) Load the tapes recording use into both decks.
3) Press three buttons x, PLAY MODE/TUNING MODE ,
and EX-CHANGE simultaneously.
4) Aging operations of CD and tape are started at the same time.
5) To exit the aging mode, perform [Cold Reset].
2. Aging mode in CD section
1) Operation during aging mode
•In the agining mode ,the program is excuted in the following
sequence.
(1) The disc tray opens and closes.
(2) The disc tray turns to select a disc 3.
(3) The pick-up accesses to the first track, and plays 3 seconds.
(4) The pick-up accesses to the last track, and plays 3 seconds.
(5) The disc tray opens and closes.
(6) The disc tray turns to select a disc 1.
(7) The same operation starts like step (3).
(8) After a disc 1 aging operation, a disc 2 is selected.
(9) When an aging operation of a disc 3 is completed, the display
“AGING ∗∗∗∗” value increases.
(10) If no error occurs, the aging operation continues repeatedly.
2) Error display
Step
1
2
3
4
5
6
7
8
9
10
11
12
Operation
Rewind the TAPE A
Rewind the TAPE B
Play the TAPE A (1 minute)
Stop the TAPE A (1 second)
Play the TAPE A (3 minutes)
Rewind(AMS) the TAPE A
F.F.(AMS) the TAPE A
Play the TAPE B (1 minute)
Stop the TAPE B (1 second)
Record the TAPE B (3 minutes)
Rewind(AMS) the TAPE B
F.F.(AMS) the TAPE B
Display
TAPE AAG-1
TAPE BAG-2
TAPE AAG-2
TAPE AAG-3
TAPE AAG-4
TAPE AAG-5
TAPE AAG-6
TAPE BAG-2
TAPE BAG-3
TAPE BAG-4
TAPE BAG-5
TAPE BAG-6
Disc error
Display Error
E00D01022 Focus error (No disc)
E00D02022 Sub Q error (Focus is good)
E00D02023 TOC reading error
E00D02014 Access error (Unable within regular time)
Mechanism error
Display Error
E00M__E_0 Error during opening tray
E00M__C_2 EX-CHANGE disc error
E00M__D_0 Error during closing tray
E00M__F_3 EX-OPEN error
E00M__D_5 EX-CLOSE error
E00M__C_2 Chuck-up error
E00M__C_3 Unchucking error
3. Aging mode in Tape Deck section
1) Operation during aging mode
•In the agining mode, the program is excuted in the following
sequence.
2) Error display
•If error occurred, the display remains like “TAPE BAG-2”.
4. Exiting from the aging mode
•Be sure to perform Cold Reset to exit from the aging mode.

19
HCD-GX450
[MCTest Mode]
•This mode is used to test the function of the equalizer.
Procedure:
1. Press ?/1button to turn the set ON.
2. To enter the test mode, press the three buttons x , PLAY
MODE/TUNING MODE and DISC 3 simultaneously.
3. Press the EQ + button.
The function of the equalizer is set to “MAX”.
4. Press the EQ - button.
The function of the equalizer is set to “MIN”.
5. Press the PRESET EQ button.
The function of the equalizer is set to “EQ FLAT”.
6. MASTER VOLUME up and down.
“VOLUME MIN” “VOLUME 16” “VOLUME MAX” is
displayed.
7. Press the GROOVE button.
The message “VACS OFF” or “VACS ON” is displayed.
8. To exit from this mode, press ?/1button to turn the set OFF.
[CD Ship Mode (LOCK) ]
•This mode moves the pick-up to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “CD”.
3. Press ?/1button to turn the set OFF.
4. Press CD button and ?/1button simultaneously.
5. The “STANDBY” display blinks instantaneously, the message
“LOCK” is displayed and the CD ship mode is set.
[CD Ship (LOCK) & COLD RESET MODE]
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Press ?/1 button to turn the set OFF.
4. Press three buttons x, CD and DISPLAY simultaneously.
5. The “STANDBY” display blinks instantaneously and CD ship
mode is set.
6. To fluorescent indicator tube displays “COLD RESET” and
the set is reset.
[DiscTray Lock]
Procedure:
1. Press the ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Presstwobuttonsof xand Zsimultaneously forfiveseconds.
4. The message “LOCKED” is displayed and the tray is locked.
(Even if exiting from this mode, the tray is still locked.)
5. Presstwo buttons of xand Zsimultaneously for fiveseconds
again.
6. The message “UNLOCKED” is displayed and the tray is
unlocked.
7. To exit from this mode, press the ?/1 button to turn the set
OFF.
[PANEL Test Mode]
•All fluorecent segments and LEDs are tested.
•Keyboard check.
Procedure:
1. Press ?/1button to turn the set ON.
2. To enter the test mode, press the three buttons x , PLAY
MODE/TUNING MODE and ENTER simultaneously.
3. All segments and LEDs (without STANDBY LED) are turned
on.
4. Press Xand ENTER buttons simultaneously, and the key
check mode is activated.
5. The message “KEY 0 0 0 ” is displayed.
Each time a button is pressed, the key code number is displayed.
6. Press Xand ENTER buttons simultaneously, and the key
count mode is activated.
7. The message “KEYCNT 0” is displayed.
Each time a button is pressed, “KEYCNT 0” value increased.
However, once a button is pressed, it is no longer taken into
account.
8. Press Xand ENTER buttons simultaneously, and the head
phone detect mode is activated.
9. The message “H_P OFF” is displayed when a headphone jack
is not inserted.
“H_P ON ” is displayed when a headphone jack is inserted.
10. Press Xand ENTER buttons simultaneously, and the volume
control detect mode is activated.
11. The message “VOLUME FLAT” is displayed.
“VOLUME UP” is displayed if rotating MASTER VOLUME
knob clockwise, or “VOLUME DOWN” is displayed if rotating
counterclockwise.
12. To exit from the GC test mode after the head phone detect mode,
press Xand ENTER buttons simultaneously.
[Version and Destination Display Mode]
•The version or destination is displayed.
Procedure:
1. Press ?/1button to turn the set ON.
2. To enter the test mode, press the three buttons x , PLAY
MODE/TUNING MODE and DISC 2 simultaneously.
3. The destination is displayed.
4. Press DISPLAY buttons simultaneously.
5. The version is displayed.
6. To exit from this mode, press the three buttons x , PLAY
MODE/TUNING MODE and DISC 2 simultaneously and
press ?/1button to turn the set OFF.
[CD Service Mode]
•This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pick-up.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “CD”.
3. To enter the test mode, press three buttons x, PLAY MODE/
TUNING MODE , and Zsimultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, press M button to move the
pick-up to outside track, or press m button to inside track.
6. To exit from this mode, perform as follows:
1) Move the pick-up to the most inside track.
2) Press ?/1button to turn the set 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.

20
HCD-GX450
[CD Repeat 5 Times Limit Release Mode]
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x, CD and ENTER simultaneously.
4. The message “LIMIT OFF” is displayed.
5. Press ?/1 button the set OFF.
[AMPTEST MODE]
Procedure:
1. Press ?/1 button to turn the set ON.
2. To enter the test mode, press three buttons x, PLAY
MODE/TUNING MODE and ENTER simultaneously.
3. Press the DISPLAY button.
The message “V0 0 0” “ 000” is displayed.
4. Press the GROOVE button.
The message “DBFB ON” “DBFB OFF” is displayed.
5. Press the SURROUND button.
The message “SURROUND ON” “SURROUND OFF” is
displayed.
6. Press the EQ BAND button.
The message “LOW” “MID” “HIGH” is displayed.
7. Press ?/1 button to turn the set OFF.