Sony HCD-GN660 User manual

HCD-GN660/GN770/
GX9000
US Model
HCD-GX9000
E Model
HCD-GN660/GN770
Australian Model
HCD-GN770
SERVICE MANUAL
MiNi Hi-Fi COMPONENT SYSTEM
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-877-800-01
2004D02-1
© 2004.04
SPECIFICATIONS
Ver 1.0 2004. 04
– Continued on next page –
•HCD-GN660/GN770/GX9000 are the
Amplifier, CD player, tape deck and tuner
section in MHC-GN660/GN770/GX9000.
Model Name Using Similar Mechanism HCD-GX450
CD CD Mechanism Type CDM74-F1BD81
Section Base Unit Name BU-F1BD81A
Optical Pick-up Name KSM-215DCP/C2NP
TAPE Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type CWM43RR35
AUDIO POWER SPECIFICATION
(MHC-GX9000 USA model only)
POWER OUTPUTAND TOTAL HARMONIC
DISTORTION:
With 6-ohm loads, both channels driven, from 120 Hz – 10 kHz;
rates 225 watts per channel minimum RMS power, with no more
than 10% total harmonic distortion from 250 miliwatts to rated
output.
Amplifier section
MHC-GX9000
Total harmonic distortion Less than 0.1%
(6 ohms at 1 kHz, 100 W)
MHC-GN770
The following are measured at
Mexican model: AC 127 V, 60 Hz
Other models: AC 120, 220, 240 V, 50/60 Hz
DIN power output (rated) 170 + 170 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
220 + 220 watts
(6 ohms at 1 kHz, 10% THD)
MHC-GN660
The following are measured at
Mexican model: AC 127 V, 60 Hz
Other models: AC 120, 220, 240 V, 50/60 Hz
Photo : GN770
DIN power output (rated) 150 + 150 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
190 + 190 watts
(6 ohms at 1 kHz, 10% THD)
Inputs
VIDEO/MD (AUDIO) IN (phono jacks):
voltage 250/450 mV, impedance 47
kiloohms
GAME (VIDEO) IN (phono jack):
1 Vp-p, 75 ohms
GAME (AUDIO) IN (phono jack):
voltage 250 mV, impedance 47 kiloohms
MIC (phone jack): sensitivity1 mV, impedance 10 kiloohms
Outputs
VIDEO OUT (phono jack): max. output level
1 Vp-p, unbalanced, Sync negative,
load impedance 75 ohms
PHONES (stereo mini jack): acceptsheadphones of8 ohms ormore

2
HCD-GN660/GN770/GX9000
FRONT SPEAKER: Use only the supplied speaker
SS-GN880
SURROUND SPEAKER: Use only the supplied
(MHC-GN770/ GX9000 only) speaker SS-RS880
Disc player section
System Compact disc and digital audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration: continuous
Laser Output Max. 44.6 µW*
*This output is the value measured
at a distance of 200 mm from the
objective lens surface on the Optical
Pick-up Block with 7 mm aperture.
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wave length 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
OPTICAL CD DIGITAL OUT
(MHC-GN770/GN660 only)
(Square optical connector jack, rear panel)
Wave length 660 nm
Output Level –18 dBm
Tape deck section
Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB), using Sony
TYPE I tape
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
North and Latin American models:
530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 1,710 kHz
(with the interval set at 9 kHz)
Middle Eastern models: 531– 1,602 kHz (with the interval set
at 9 kHz)
Other models: 531 – 1,602 kHz (with the interval
set at 9 kHz)
530 – 1,710 kHz (with the interval
set at 10 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
North American models: 120 VAC, 60 Hz
Australian model: 230 – 240 VAC, 50/60 Hz
Mexican model: 127 VAC, 60 Hz
Argentina models: 220 VAC, 50/60 Hz
Other models: 120 V, 220 V or 230 – 240VAC, 50/
60 Hz
Adjustable with voltage selector
Power consumption
MHC-GN770 215 watts
MHC-GX9000 235 watts
MHC-GN660 175 watts
Dimensions (w/h/d) (Approx.)
HCD-GN770/GX9000/GN660 280 x 360 x 394.5 mm
Mass (Approx.)
HCD-GN770 12.4 kg
HCD-GX9000 12.0 kg
HCD-GN660 11.5 kg
Supplied accessories: Remote Commander (1)
Batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Front speaker pads (8)
Surround speaker pads (8)
(MHC-GN770/GX9000 only)
Design and specifications are subject to change without notice.
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
Checkthe antennaterminals, 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. Acommercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. Abattery-operatedAC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOMor 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 2VAC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15 µF1.5 kΩAC
Voltmeter
(0.75V)
Earth Ground
Fig.A. Using an AC voltmeter to check AC leakage.

3
HCD-GN660/GN770/GX9000
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL
Location of Controls........................................................ 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Case ................................................................................. 8
3-3. Loading Panel Assy ......................................................... 8
3-4. Front Panel Assy.............................................................. 9
3-5. CD Mechanism Deck (CDM74-F1BD81) ...................... 9
3-6. Tape Mechanism Deck, Game Board.............................. 10
3-7. CD Switch Board, Panel Board ....................................... 10
3-8. Switch Board ................................................................... 11
3-9. Tuner Pack ....................................................................... 11
3-10. Primary Board ................................................................. 12
3-11. Rear Panel........................................................................ 12
3-12. Main Board ...................................................................... 13
3-13. Surround Board, PABoard .............................................. 13
3-14. Power Transformer .......................................................... 14
3-15. Driver Board, SW Board ................................................. 14
3-16. BD Board, Optical Pick-Up (KSM-215DCP/C2NP) ...... 15
3-17. Sensor Board ................................................................... 15
3-18. Motor (TB) Board ........................................................... 16
3-19. Motor (LD) Board ........................................................... 16
4. TEST MODE.............................................................. 17
5. MECHANICAL ADJUSTMENTS ....................... 21
6. ELECTRICAL ADJUSTMENTS
Deck section .................................................................... 21
CD Section ...................................................................... 22
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
This appliance is classified as
a CLASS 1 LASER product.
This label is located on the rear
exterior.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON THE SCHEMATIC DIAGRAMS AND INTHE 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.
7. DIAGRAMS
7-1. Circuit Board Location .................................................... 26
7-2. Block Diagram – CD Section – ...................................... 28
7-3. Block Diagram – Tuner/Tape Deck Section – ................ 29
7-4. Block Diagram – Main Section – ................................... 30
7-5. Block Diagram – Display/Power Section –.................... 31
7-6. Printed Wiring Board – BD Board – .............................. 32
7-7. Schematic Diagram – BD Board – ................................. 33
7-8. Printed Wiring Board – CD Mechanism Board –........... 34
7-9. Schematic Diagram – CD Mechanism Board – ............. 35
7-10. Printed Wiring Boards – Main Board – .......................... 36
7-11. Schematic Diagram – Main Board (1/3) – ..................... 37
7-12. Schematic Diagram – Main Board (2/3) – ..................... 38
7-13. Schematic Diagram – Main Board (3/3) – ..................... 39
7-14. Printed Wiring Boards
– Game, CD Switch Board – ........................................... 40
7-15. Schematic Diagram
– Game, CD Switch Board – ........................................... 41
7-16. Printed Wiring Board – PABoard – ............................... 42
7-17. Schematic Diagram – PA Board – .................................. 43
7-18. Schematic Diagram –Panel Board (1/2) – ...................... 44
7-19. Schematic Diagram –Panel Board (2/2) – ...................... 45
7-20. Printed Wiring Board – Panel Board – ........................... 46
7-21. Printed Wiring Boards – Primary Board – ..................... 47
7-22. Schematic Diagram – Primary Board –.......................... 48
7-23. Schematic Diagram – Surround Board –........................ 48
7-24. Printed Wiring Board – Surround Board – ..................... 49
7-25. IC Block Diagram ........................................................... 50
7-26. IC Pin Function Description ............................................ 51
8. EXPLODED VIEWS
8-1. Case, Rear Panel Section................................................. 57
8-2. Front Panel Section ......................................................... 58
8-3. Chassis Section................................................................ 59
8-4. CD Mechanism Deck Section-1
(CDM74-F1BD81) .......................................................... 60
8-5. CD Mechanism Deck Section-2
(CDM74-F1BD81).......................................................... 61
9. ELECTRICAL PARTS LIST................................ 62

4
HCD-GN660/GN770/GX9000 SECTION 1
SERVICING NOTES
NOTES ON HANDLINGTHE 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-
upblock.Therefore, whenchecking thelaser diodeemission, 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 waveform is output several times.
•MODEL IDENTIFICATION
– Back Panel –
MODEL PART No.
GN770: E2, E3models 4-252-722-0[]
GX9000 4-252-722-1[]
GN770: AUS model 4-252-722-2[]
GN770: E51 model 4-252-722-3[]
GN770: Mexican model 4-252-722-4[]
GN660: E2, E3models 4-252-555-0[]
GN770: E51 model 4-252-555-1[]
GN770: Mexican model 4-252-555-2[]
GN660: AR model 4-252-555-3[]
•Abbreviation
E2 : 120 VAC Area in E model
E3 : 240 VAC Area in E model
E51 : Chilean and Peruvian model
AUS : Australian model
AR : Argentine model
PART No.

5
HCD-GN660/GN770/GX9000
SECTION 2
GENERAL This section is extracted
from instruction manual.
LOCATINGTHE CONTROLS
Main unit
ALBUM qh
AMP MENU ek
CD eh
CD SYNC qf
Deck A wj
Deck B w;
DIRECTION qa
DISC 1 ~ 3 3
Disc tray rs
DISPLAY r;
Display 5
EFFECT ON/OFF ej
ENTERwa
EQ EDIT 8
EX-CHANGE/DISC SKIP 4
FM MODE q;
GAME e;
GAMEINPUT (jacks) wh
GAME MIXING ef
GROOVE wl
ILLUMINATION wk
MIC (jack) wg
MIC LEVEL wf
MULTI JOG ws
P FILE MEMORY 7
PHONES (jack) wd
PLAY MODE 9
Power illuminator 2
REC PAUSE/START qg
REPEAT q;
SLEEP el
SURROUND (MHC-GN660
only) ra
SURROUND SPEAKER MODE
(except for MHC-GN660 only)ra
TAPE A/B ed
TUNER/BAND eg
TUNER MEMORY qa
TUNING MODE 9
VIDEO/MD es
VOLUME rd
?/1 (power) 1
ZOPEN/CLOSE 6
nN (play) qs
. > (gobackward/forward)qd
m M (rewind/fast forward)
qh
X(pause) ql
x(stop) qk
ZA (Eject A) ea
ZB (Eject B) qj
List of button locations and reference pages
ALPHABETICAL ORDER
A – D
E – L
M – R
S – Z
SYMBOLS
hH
A A
wgwf wdwh
qh
qk
qg qf
qj
w;
ws
ql
wa
9
qa
qd
q;
qs
78
2
eg
rs
r;
el
ra
rd
eh
ek
ej
ef
ea
wj
41 3 65
ed
es e;
wl wk

6
HCD-GN660/GN770/GX9000 This section is extracted
from instruction manual.
Remote c ontrol
ALBUM + qf
ALBUM – qh
CD wf
CLEAR qk
CLOCK/TIMER SELECT 2
CLOCK/TIMER SET 4
DISC SKIP qd
DISPLAY wh
ENTER qs
EQ qj
FM MODE 6
FUNCTION 8
PLAY MODE 5
REPEAT 6
SLEEP 1
TAPE wd
TUNER/BAND 7
TUNER MEMORY wg
TUNING MODE 5
VOLUME +/– qg
?/1 (power) 3
x(stop) qa
X(pause) ql
N (play) w;
–.(go backward) ws
>+ (go forward) wa
m(rewind) q;
M(fast forward) 9
ALPHABETICAL ORDER
A – E F – Z
SYMBOLS
7
5
q;
qg
qh
qj
qk
w;
ws
wd
wg
wh
qf
qd
qs
qa
9
8
6
4
3
12
ql
wa
wf

7
HCD-GN660/GN770/GX9000
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
3-2.CASE
(Page 8)
3-3.LOADING PANEL ASSY
(Page 8)
3-4.FRONT PANEL ASSY
(Page 9)
3-14.POWER TRANSFORMER
(Page 14)
3-11.REAR PANEL
(Page 12)
3-5.CD MECHANISM DECK
(CDM74-F1BD81)
(Page 9)
3-16. BD BOARD,
OPTICAL PICK-UP
(KSM-215DCP/C2NP)
(Page 15)
3-6.TAPE MECHANISM DECK,
GAME BOARD
(Page 10)
3-15.DRIVER BOARD,
SW BOARD
(Page 14)
3-10.PRIMARY BOARD
(Page 12)
3-18.MOTOR (TB) BOARD
(Page 16)
3-19.MOTOR (LD) BOARD
(Page 16)
3-17.SENSOR BOARD
(Page 15)
3-7.CD SWITCH BOARD,
PANEL BOARD
(Page 10)
3-12.MAIN BOARD
(Page 13)
3-13.SURROUND BOARD,
PA BOARD
(Page 13)
3-8.SWITCH BOARD
(Page 11)
3-9.TUNER PACK
(Page 11)
SET

8
HCD-GN660/GN770/GX9000
Note: Follow the disassembly procedure in the numerical order given.
3-2. CASE
3-3. LOADING PANEL ASSY
1 two screws
(case 3 TP2)
(M3 x 8)
2 screw (case 3 TP2)
(M3 x 12)
3 five screws
(+BVTT3 x 6)
7 case
6
5
1
two screws
(case 3 TP2)
(M3 x 8)
2 screw (case 3 TP2)
(M3 x 12)
4 two screws
(+BVTT3 x 6)
CD mechanismdeck (CDM74-F1BD81)
1 Turn the pulley to the arrow direction.
Front side
Pulley
4 loading panel assy
3
2
Pull out disc tray

9
HCD-GN660/GN770/GX9000
3-4. FRONT PANEL ASSY
3-5. CD MECHANISM DECK (CDM74-F1BD81)
3 screw (BVTP3 x 10)
2 five screws (BVTP3 x 10)
9 front panel ASSY
6 from CN801 on GAME board
5 from deck B head
CN508
CN509
7 from deck A head
8 from CN802 on
GAME board
1 two wires
(flat type)
3 screw (BVTP3 x 10)
4 fcrew (BVTP3 x 10
)
MAIN board
4 CD mechanism deck
2 wire (flat type) (27 core)
1 two screws (BVTP3 x 10
)
3 CN701
MAIN board
CN201

10
HCD-GN660/GN770/GX9000
3-6.TAPE MECHANISM DECK, GAME BOARD
3-7. CD SWITCH BOARD, PANEL BOARD
2 tape mechanism deck
3 three screws
(+BVTP2.6 x 8)
1 five screws
(+BVTP2.6 x 8)
6 GAME board
5 knob (MIC)
4 bracket (MIC
)
1 five screws
(+BVTP2.6 x 8)
9 wire (flat type) (19 core)
from CN902
7 PANEL board
5 nineteen screws
(+BVTP2.6 x 8)
2 CD SWITCH board
3 knob (VOL)
6 claw
4 CN903
8 CN907

11
HCD-GN660/GN770/GX9000
3-8. SWITCH BOARD
3-9. TUNER PACK
2 two screws
(+BVTT3 x 6)
1 wire (flat type)
(11 core)
3 tuner pack
1 two knobs (AMS)
3 SWITCH board
2 two screws
(+BVTP2.6 x 8
)

12
HCD-GN660/GN770/GX9000
3-10. PRIMARY BOARD
3-11. REAR PANEL
6 bracket, sub
4 bracket, top
qa CN201
qs PRIMARY board
9 connector
0 CN101
7 CN1002
1 two screws
(BVTP3 x 10)
5 two screwss
(BVTP3 x 6)
2 four screws
(BVTP3 x 6
)
8 connector
3 two screws
(+BVTT3 x 6)
1 nine screws
(+BVTP3 x 10)
2 screw
(+BVTT3 x 6)
4 Connector
CN503
MAIN board
3 rear panel
with fan

13
HCD-GN660/GN770/GX9000
3-13. SURROUND BOARD, PA BOARD
3-12. MAIN BOARD
3 two screws
(+BVTP3 x 6)
4 two screws
(+BVTP3 x 6)
6 screw
(+BVTP3 x 10)
5 screw
(+BVTP3 x 6)
1 connector
6p (CN604)
2 connector
4p (CN703)
8 two screws
(+BVTP3 x 10)
9 MAIN board
7 POWER board assy
6 screw
(+BVTP3 x 10)
qs heat sink
7 screw
(+BVTP3 x 10)
8 two screws
(+BVTP3 x 16)
9 two screws
(+BVTP3 x 10)
0 two screws
(+BVTP3 x 6)
3 three screws
(+BVTP3 x 16)
4 screw
(+BVTP3 x 10)
qa screw
(+BVTP3 x 10)
qd PA board
5 SURROUND board
1 connector
6p (CN604)
2 connector
4p (CN703)

14
HCD-GN660/GN770/GX9000
3-14. POWER TRANSFORMER
3-15. DRIVER BOARD, SW BOARD
1 connector
6p (CN604)
2 connector
4p (CN703)
3 six screws
(+BVTT 4
× 8 )
4 power transforme
r
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))

15
HCD-GN660/GN770/GX9000
3-16. BD BAORD, OPTICAL PICK-UP (KSM-215DCP/C2NP)
3-17. 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 D 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)

16
HCD-GN660/GN770/GX9000
3-18. MOTOR (TB) BOARD
3-19. MOTOR (LD) BOARD
6 Remove the two solderings of motor.
8 MOTOR (TB) board
7 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))

17
HCD-GN660/GN770/GX9000
* Check of Amplifier
1. Press [EQ EDIT] button repeatedly until a message “GEQ
MAX” appears on the fluorescent indicator tube. GEQ
increases to its maximum.
2. Press[EQ EDIT] button repeatedly until amessage “GEQMIN”
appears on the fluorescent indicator tube. GEQ increases to
its minimum.
3. Press [EQ EDIT] button repeatedly until a message “GEQ
FLAT” appears on the fluorescent indicator tube. GEQ set to
flat.
4. When the [VOLUME] knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOLUME MAX” appears.
5. When the [VOLUME] knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
functionis changedtoVIDEOautomatically.When[CD SYNC]
buttonis pressed duringrecording infunction,ALC (Automatic
Logic Control) is turned on.
2. Duringrecording, turn
M
m
knobto counterclockwise
rotation will change the function to TAPE B and rewind Tape
B until the recording start position and playback of Tape B is
started. If the [REC PAUSE/ START] button is pressed for a
pause and pressed again to resume recording during recording
time, when tape deck B is rewind, tape deck B will be rewind
until the position where the pause is applied.
* AMS Test Mode
1. Select the function “TAPE A” or “TAPE B”.
2. Select Loop or Relay direction mode by pressing the
[DIRECTION TUNER MEMORY] button. Insert a test tapeAMS-
110A or AMS-120 to selected tape deck.
3. Press the [AMP MENU] button to enter the AMS test mode.
4. After the test tape is rewind to the beginning of the tape, the
AMS+is checked,and the mechanismis shutoffafter detecting
the AMS signal twice.
5. Then theAMS- is checked and the mechanism is shut off after
detecting the AMS signal twice.
6. When the check is complete, a message of either OK or NG
appears.
* To release MC Test mode.
1. To release this mode, press ?/1 button.
2. The cold reset is enforced at the same time.
[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 xbutton, [ENTER] button, and ?/1 button
simultaneously.
2. The fluorescent indicator tube becomes blank for a while, and
the set is reset.
[GCTEST MODE]
•Thismode isused tocheck thefluorescent indicatortube, LED,
model,destination, software version, volume, key jog, encoder
and VACS level.
Procedure:
1. Press xbutton, [ENTER] button and [DISC 2] button
simultaneously.
2. AllLEDs andsegments in fluorescent indicator tubeare lighted
up.
3. When you want to enter the software version display mode,
press[DISC 1] button. Themodel and destination are displayed.
4. Each time [DISC 1] button is pressed, the display changes from
MCversion, GC version, CD version, CDDM version,CDMA
version, CDMB version, BDA version, BDB version, ST
version, TAversion, TM version andTC version in this order,
and returns to the MC version display.
5. When [DISC 3] button is pressed while the version numbers
are being displayed except model and destination, the date of
the software creation appear. When [DISC 3] button is pressed
again,the displayreturns tothe softwareversion display.When
[DISC 1] button is pressed while the date of the software
creation is being displayed, the date of the software creation
is displayed in the same order of software version display.
6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“K 0 J 0 V 0 E 0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into
account.
“J” value increases in the manner of 0,1, 2, 3 ... if [MULTI
JOG] knob is turned clockwise, or it decreases in the manner
of0, 9,8, 7... if [MULTI JOG] knob isturned counter-clockwise.
“V” value increases in the manner of 0,1, 2, 3 ... if [VOLUME]
knob is turned clockwise, or it decreases in the manner of 0,
9, 8, 7 ... if [VOLUME] knob is turned counter-clockwise.
“E”value increases in the mannerof 0,1,2, 3 ... if
>
.
knob is turned clockwise, or it decreases in the manner of 0,
9, 8, 7 ... if
>
.
knob is turned counter-clockwise.
8. When [DISC 3] button is pressed after all LEDs and segments
in fluorescent indicator tube light up, the fluorescent indicator
tube displays “VACS A+B APCC”.A is VACS level which is
trigger by signal level, B is VACS level which is trigger by
temperature and CC is VACS level which is trigger by
APVACS (Abuse Protection VACS).
9. When [EX-CHANGE/DISC SKIP] button is pressed after all
LEDs and segments in fluorescent indicator tube light up,
alternate segments in fluorescent indicator tube would light
up.If youpress [EX-CHANGE/DISC SKIP] buttonagain, another
half of alternate segments in fluorescent indicator tube would
light up. Pressing [EX-CHANGE/DISC SKIP] button again
would case all segments lights up.
10. To release this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
[MC TEST MODE]
•Thismode isused to check operations ofthe respectivesections
of Amplifier, Tuner, and Tape.
Procedure:
* To enter MC Test Mode
1. Press xbutton, [ENTER] button and [DISC 3] button
simultaneously.
2. The CD ring indicators TAPE A and TAPE B indicators flash
on the fluorescent indicator tube. The function is changed to
VIDEO.
SECTION 4
TEST MODE

18
HCD-GN660/GN770/GX9000
[VACS ON/OFF]
•This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
1. Press ?/1 button to turn the set ON.
2. Press [ENTER] button and [GAME MIXING] button
simultaneously. The message “VACS OFF” or “VACS ON”
appears.
[TUNER STEP CHANGE]
•The step interval of AM channels can be toggled between 9
kHz and 10 kHz.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Press [TUNER/BAND] button to select the “AM”.
3. Press ?/1 button to turn the set OFF.
4. Press [ENTER] button and ?/1 button simultaneously. The
system will turn ON automatically. The message “AM 9k
STEP” or AM 10k STEP” appears and thus the channel step
is changed.
[CD SERVICE MODE]
•This mode let you move the CD sled motor freely. Use this
mode when you want to clean the optical pick-up.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select CD function.
3. Press x, [ENTER] button, and
Z
OPEN/CLOSE
button
simultaneously.
4. The CD service mode is activated. The message “SERVICE
MODE” appears.
5. With the CD in stop status, turn
M
m
knob toclockwise
rotation to move the optical pick-up to outside track, or turn
M
m
knob to counterclockwise rotation to move to
inside track. The message “SLED OUT” or “SLED IN”
appears.
6. To turn on or off the laser, press [PLAY MODE] button. The
message “LASER ON” or “LASER OFF” appears on the
fluorescent indicator tube.
7. To release this mode, press ?/1 button.
[AGING MODE]
This mode can be used for operation check of CD section.
•If an error occurs, the aging operation would stops and the
status is displayed.
•If there are no error occurs, the aging operation would
continues repeatedly.
Procedure:
1. Press ?/1 button to turn the set ON
2. Select CD function.
3. Load three discs on the disc tray.
4. Press [PLAY MODE] button to select the “ALL DISCS” mode,
andpress the[REPEAT] button toselect “REPEATOFF”mode.
5. Press x button, [ENTER] button, and [EX-CHANGE/DISC
SKIP] button simultaneously.
6. Aging operation is started.
7. To release this mode, press ?/1 button or disconnect the
power cord to turn the power OFF.
Aging mode sequence:
Start (from disc 1)
Disc chucking
TOC reading
Play first track for 2 seconds
Play last track for 2 seconds
EX-CHANGE open/close
Open the disc tray
Disc skip
Close the disk tray
Change the next disc.

19
HCD-GN660/GN770/GX9000
Display
M*$$%%&&##00
3) Display of no disc errors
D*: The number of mechanical error (“00” is latest one)
(Rotate
>
.
knob in the direction of either to display next
error)
$$: Error type
01: Focus error
02: GFS error
03: Setup error
%%: Not used
&&:00: No disc judgment without chucking retry.
01: No disc judgment after chucking retry.
##: The state when judged as no disc
01: Stop
02: Setup
03: TOC reading
04: Access
05: Playback
06: Pause
07: Manual search (Play)
08: Manual search (Pause)
[CD REPEAT 5 LIMIT OFF MODE]
•The number of repeat for CD playback is 5 times when the
repeat mode is “REPEAT ALL”. This mode enables CD to
repeat playback for limitless times.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select CD function.
3. Press xbutton, [EQ EDIT] button and [CD] button
simultaneously to enter the CD repeat 5 limit off mode and
the fluorescent indicator tube displays “LIMIT OFF”.
4. To release this mode, operate the cold reset. (Refer to the “MC
COLD RESET”)
[CD SHIP MODE (WITH MEMORY CLEAR)]
•This mode moves the optical pick-up to the position durable
to vibration and clears all data including preset data stored in
the RAM to initial conditions. Use this mode when returning
the set to the customer after repair.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select CD function.
3. Press xbutton, [ENTER] button and [GAME] button
simultaneously. The set will power off automatically.
4. After the “STANDBY” blinking display finish, a message
“LOCK” is displayed on the fluorescent indicator tube and
the CD ship mode is set.
Display
D*$$%%&&##00
• Display when an error occurred (CD Error Code Mode)
Procedure:
1. Press xbutton, [ENTER] button and [DISC 1] button
simultaneously to enter the error code display mode.
2. The fluorescent indicator tube displays the number of total
error.
3. Each time
M
m
knob is rotated, display change as
below.
Display of total error
>+ direction
–.
direction
Display of Mechanical errors
>+ direction
–.
direction
Display of no disc errors
4. To clear the error record, operate the cold reset. (Refer to the
“MC COLD RESET”)
5. To release this mode, press the ?/1 button or disconnect
the power plug to turn the power OFF.
1) Display of total error
EM**: The number of mechanical errors.
ED**: The number of no disc errors after chucking the disc.
2) Display of mechanical errors
M*: The number of mechanical error (“00” is latest one)
(Rotate
>
.
knob in the direction of either to display next
error)
$$: Not used
%%: Loading related error (Second figure is not used)
D: Stopby the problem other than mechanical problem while
closing.
E: Stopby the problem other than mechanical problem while
opening.
C: Stopby the problem other than mechanical problem while
chucking up.
F: Stopby the problem other than mechanical problem while
chucking down.
&&: Emerging error
01: Stop while chucking up.
02: Stop while chucking up.
03: Time-out of EX-CHANGE open.
05: Time-out of EX-CHANGE close.
##: Not used
Display
EM**ED**

20
HCD-GN660/GN770/GX9000
[CD SHIP MODE (WITHOUT 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 ?/1 button to turn the set ON.
2. Select CD function.
3. Press [CD] button and ?/1 button simultaneously. The set
will power off automatically.
4. After the “STANDBY” blinking display finish, a message
“LOCK” is displayed on the fluorescent indicator tube and
the CD ship mode is set.
[CD POWER MANAGE]
•This mode let you switch on or off power supply to the BU
during TUNER function.
• When CD POWER is set to OFF, the power supply to the BU
is cut off during TUNER function. It will increase the time
taken to access CD when function change from TUNER to
CD but it will improve tuner reception.
•When CD POWER is set to ON, the power supply to the BU
is not cut off during TUNER function. It will reduce the time
taken to access CD when function change from TUNER to
CD but it will decrease tuner reception performance.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select CD function.
3. Press ?/1 button to turn the set OFF.
4. Press xbutton and ?/1 button simultaneously. The set
will power on automatically.
5. The message “CD POWER ON” or “CD POWER OFF” will
be displayed on the fluorescent indicator tube.
[CDTRAY LOCK MODE]
•This mode let you lock the disc trays. When this mode is
activated,the disc tray will not open when
ZOPEN/CLOSE
button or [EX-CHANGE/DISC SKIP] button is pressed. The
message“LOCKED” will be displayed in the will be displayed
on the fluorescent indicator tube.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select CD function.
3. Press xbutton and
ZOPEN/CLOSE
button
simultaneously and hold down until “LOCKED” or
“UNLOCKED” displayed on the fluorescent indicator tube
(around 5 seconds).
[VIDEO/MD SWITCHING]
•This mode let you switch from VIDEO to MD and vice-versa.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select VIDEO function.
3. Press [VIDEO/MD] button and ?/1 button simultaneously.
The function will change to MD. Press the same buttons again
to change from MD to VIDEO.