Sony MHC-GNX60 User manual

MHC-GNX60/GNX70/GX9900
US Model
MHC-GX9900
E Model
Australian Model
MHC-GNX60/GNX70
SERVICE MANUAL
MiNi Hi-Fi COMPONENT SYSTEM
Sony Corporation
Audio Group
Published by Sony Engineering Corporation
9-879-543-01
2005C02-1
© 2005.03
SPECIFICATIONS
Ver. 1.0 2005.03
•MHC-GNX60/GNX70/GX9900 are composed of following models.
As for the service manual, it is issued for each component model, then, please refer to it.
COMPONENT MODEL NAME
General
Power requirements
US model: 120 V AC, 60 Hz
Australian model: 230 – 240 V AC, 50/60 Hz
Argentina models: 220 V AC, 50/60 Hz
Other models: 120 V, 220 V or 230 –
240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption
MHC-GNX60 200 watts
MHC-GNX70 225 watts
MHC-GX9900 250 watts
Dimensions (w/h/d) (Approx.)
280 x 360 x 398.5 mm
Mass (Approx.)
MHC-GNX60 11.3 kg
MHC-GNX70 12.1 kg
MHC-GX9900 11.8 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-GNX70/GX9900)
Design and specifications are subject to change without notice.
PARTS LIST
Ref. No. Part No. Description Remarks
ACCESSORIES
************
1-478-518-21 COMMANDER, STANDARD (RM-SC3)
1-501-374-12 ANTENNA, LOOP (AM)
1-793-184-23 CONNECTOR (F TYPE ADAPTOR) (FM)
2-547-453-11 MANUAL, INSTRUCTION (ENGLISH)
2-547-453-21 MANUAL, INSTRUCTION (FRENCH) (E2, E3)
2-547-453-31 MANUAL, INSTRUCTION (SPANISH) (E2, E51, AR)
4-210-254-02 CUSHION (FOOT) (7mm, 8pcs) (for SPEAKER)
•Abbreviation
E2 : 120 V AC Area in E model
E3 : 240 V AC Area in E model
E51 : Chilean and Peruvian model
AR : Argentina model
MHC-GNX60 MHC-GNX70 MHX-GX9900
COMPACT DISC DECK RECEIVER SYSTEM HCD-GNX60 HCD-GNX70 HCD-GX9900
SPEAKER SS-GNX70RS FRONT SPEAKER SS-GNX60 SS-GNX100 SS-GNX100
SYSTEM (MHC-GNX70) SURROUND SPEAKER SS-RSX80 SS-RSX80

MHC-GNX60/GNX70/GX9900
REVISION HISTORY
Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.
Ver. Date Description of Revision
1.0 2005.03 New

HCD-GNX60/GNX70/
GX9900
US Model
HCD-GX9900
E Model
Australian Model
HCD-GNX60/GNX70
SERVICE MANUAL
MiNi Hi-Fi COMPONENT SYSTEM
SPECIFICATIONS
Ver. 1.1 2006.06
– Continued on next page –
•HCD-GNX60/GNX70/GX9900 are the Amplifier,
CD player, tape deck and tuner
section in MHC-GNX60/GNX70/GX9900.
Model Name Using Similar Mechanism HCD-GN880
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 CMAT5Z2
AUDIO POWER SPECIFICATION (MHC-GX9900 USA model only)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
With 6-ohm loads, both channels driven, from 120 Hz – 10 kHz; rates 230
watts per channel minimum RMS power, with no more than 10% total
harmonic distortion from 250 miliwatts to rated output.
Amplifier section MHC-GX9900
Total harmonic distortion Less than 0.1%
(6 ohms at 1 kHz, 100 W)
MHC-GNX70
The following are measured at
Mexican model: AC 127 V, 60 Hz
Other models: AC 120, 220, 240 V, 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-GNX60
The following are measured at
Mexican model: AC 127 V, 60 Hz
Brazil model: AC 127 V or 220 V, 60 Hz
Other models: AC 120, 220, 240 V, 50/60 Hz
DIN power output (rated) 150 + 150 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
200 + 200 watts (6 ohms at 1 kHz,10% THD)
Inputs
VIDEO/MD (AUDIO) IN (phono jacks):
voltage 250/450 mV,
impedance 47 kiloohms
TV (AUDIO) IN (phono jack): voltage 250 mV,
impedance 47 kiloohms
MIC (phone jack): sensitivity 1 mV,
impedance 10 kiloohms
Outputs
PHONES (stereo mini jack): accepts headphones of
8 ohms or more
FRONT SPEAKER: Use only the supplied speaker
• SS-GNX100 (MHC-GNX70/GX9900)
• SS-GNX60 (MHC-GNX60)
SURROUND SPEAKER: Use only the supplied speaker
• SS-RSX80 (MHC-GNX70/GX9900)
Disc player section
System Compact disc and digital audio system
Laser Semiconductor laser (l=780 nm)
Emission duration: continuous
Laser Output Max. 44.6 mW*
*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 (Square optical connector jack, rear panel)
(For MHC-GNX60/GNX70)
Wave length 660 nm
Output Level –18 dBm
Photo : HCD-GNX70
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
9-879-532-02
2006F02-1
© 2006.06

2
HCD-GNX60/GNX70/GX9900
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 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.
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)
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 model: 120 V AC, 60Hz
Australian model: 230 – 240 V AC, 50/60 Hz
Argentina model: 220 V AC, 50/60 Hz
Other models: 120 V, 220V or 230 – 240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption
MHC-GX9900 250 watts
MHC-GNX70 225 watts
MHC-GNX60 200 watts
Dimensions (w/h/d) (Approx.) 280 ×360 ×398.5 mm
Mass (Approx.)
HCD-GNX70 12.1 kg
HCD-GX9900 11.8 kg
HCD-GNX60 11.3 kg
Design and specifications are subject to change without notice.
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.
After correcting the original service problem, perform the following
safety checks 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
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 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15 µF1.5 kΩ
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.

3
HCD-GNX60/GNX70/GX9900
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL
Location of Controls........................................................ 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Side Panel, Top Case ....................................................... 8
3-3. Loading Panel Assy ......................................................... 8
3-4. Front Panel Assy .............................................................. 9
3-5. Tuner Pack ....................................................................... 9
3-6. Tape Mechanism Deck, Mic Board ................................. 10
3-7. Panel Board, CD-SW Board ............................................ 10
3-8. CD Mechanism Deck ...................................................... 11
3-9. Back Panel ....................................................................... 11
3-10. Primary Board ................................................................. 12
3-11. Power AMP PC Board Assy, Main Board ....................... 12
3-12. Surround Board, PA Board .............................................. 13
3-13. Power Transformer (T1200) ............................................ 13
3-14. Driver Board, SW Board ................................................. 14
3-15. CD Board ......................................................................... 14
3-16. Sensor Board ................................................................... 15
3-17. Motor (TB) Board ........................................................... 15
3-18. Motor (LD) Board ........................................................... 16
4. TEST MODE .............................................................. 17
5. MECHANICAL ADJUSTMENTS ....................... 21
6. ELECTRICAL ADJUSTMENTS
Deck section .................................................................... 21
CD Section ...................................................................... 22
7. DIAGRAMS
7-1. Circuit Board Location .................................................... 26
7-2. Block Diagram – CD Section – ...................................... 27
7-3. Block Diagram – Tape Section – .................................... 28
7-4. Block Diagram – Main Section – ................................... 29
7-5. Block Diagram – AMP Section – ................................... 30
7-6. Block Diagram – Display Section – ............................... 31
7-7. Printed Wiring Board – CD Board – .............................. 32
7-8. Schematic Diagram – CD Board – ................................. 33
7-9. Printed Wiring Board – CD Mechanism Boards – ......... 34
7-10. Schematic Diagram – CD Mechanism Boards – ............ 35
7-11. Printed Wiring Boards – Main Board – .......................... 36
7-12. Schematic Diagram – Main Board (1/3) – ..................... 37
7-13. Schematic Diagram – Main Board (2/3) – ..................... 38
7-14. Schematic Diagram – Main Board (3/3) – ..................... 39
7-15. Printed Wiring Boards – Panel Board – ......................... 40
7-16. Schematic Diagram – Panel Board –............................... 41
7-17. Printed Wiring Board – CD-SW, Jog, Mic Boards – ...... 42
7-18. Schematic Diagram – CD-SW, Jog, Mic Boards – ........ 43
7-19. Printed Wiring Board – PA Board – ............................... 44
7-20. Schematic Diagram – PA Board – .................................. 45
7-21. Printed Wiring Board – Trans, Primary Boards – .......... 46
7-22. Schematic Diagram – Trans, Primary Boards – ............. 47
7-23. IC Pin Function Description ............................................ 50
8. EXPLODED VIEWS
8-1. Case (Top), Rear Panel Section ....................................... 56
8-2. Front Panel Section ......................................................... 57
8-3. Chassis Section ................................................................ 58
8-4. CD Mechanism Deck Section-1
(CDM74-F1BD81) .......................................................... 59
8-5. CD Mechanism Deck Section-2
(CDM74-F1BD81) .......................................................... 60
9. ELECTRICAL PARTS LIST................................ 61

4
HCD-GNX60/GNX70/GX9900 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-
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 waveform is output several times.
•MODEL IDENTIFICATION
– Back Panel –
MODEL PART No.
GNX60: E2, E3 models 2-547-454-0[]
GNX70: E2, E3 models 2-547-456-0[]
GX9900 model 2-547-458-0[]
GNX60: AR model 2-588-965-0[]
GNX60: E51 model 2-588-966-0[]
GNX70: AUS model 2-588-967-0[]
GNX70: E51 model 2-588-968-0[]
GNX60: AUS model 2-588-974-0[]
•Abbreviation
AR : Argentine model
E2 : 120 V AC Area in E model
E3 : 240 V AC Area in E model
E51 : Chilean and Peruvian model
AUS:Australian model
PA R T No.

5
HCD-GNX60/GNX70/GX9900
SECTION 2
GENERAL This section is extracted
from instruction manual.
LOCATING THE CONTROLS
Main unit
ALBUM +/– ql
AMP MENU ed
AUTO/MANUAL
3)
2
CD el
CD SYNC qd
Deck A ea
Deck B ws
DIRECTION qk
DISC 1 ~ 3 7
Disc tray 9
DISPLAY rd
Display rf
ECHO LEVEL wf
ENTER wa
EQ BAND qa
EX-CHANGE/DISC SKIP 6
GROOVE eh
ILLUMINATION rs
IR Receptor r;
MASTER VOLUME 8
MIC 1 (jack) wj
MIC 2 (jack) wh
MIC LEVEL wg
MP3 BOOSTER q;
MPX
4)
qk
OPERATION DIAL wl
PHONES (jack) wk
Power illuminator wd
REC PAUSE/START qh
SOUND FLASH e;
SPEAKERS
3)
1
SURROUND
1)
rg
SURR SPEAKER MODE
2)
rg
TA PE A/B ej
Ta pe lid ws ea
TUNER/BAND ek
TUNING +/– qj
TV eg
VIDEO/MD ef
X-ROUND buttons
3)
3
WA VE/FADER/BALANCE/
RANDOM/TWISTER
X-ROUND JOG
3)
4
X-ROUND OFF
3)
1
?/1 (power) ra
ZOPEN/CLOSE 5
nN(play) qs
. > (gobackward/forward) qj
m M (rewind/fast forward) ql
X(pause) qf
x(stop) qg
ZA (Eject A) es
BZ(Eject B) w;
1)
For MHC-GNX100/GNX66/
GNX60
2)
For MHC-GNX88/GNX80/
GNX77/GNX70/GX9900
3)
MHC-GNX100 only
4)
For MHC-GNX88/GNX77/
GNX66
List of button locations and reference pages
ALPHABETICAL ORDER
A – D
E – L
M – R
S – Z
SYMBOLS
Top Panel
Front Panel
4
657
12 3
wk wgwhwj wf
qj
qk
ql
w; wz
ws wd
rg
rd
ra
el
ej
eg
wl
e;
ea
es ed
ef
eh
ek
r;
rs
rf 8
0
qa
qs qd
qf
qg
qh
9

6
HCD-GNX60/GNX70/GX9900
This section is extracted
from instruction manual.
Remote control
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
TA PE wd
TUNER/BAND 7
TUNER MEMORY wg
TUNING MODE 5
VOLUME +/– qg
The + button has a tactile dot.*
?/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
*Usethetactile dot as a reference
when operating the system.
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
312
ql
wa
wf

7
HCD-GNX60/GNX70/GX9900
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
3-2.SIDE PANEL, TOP CASE
(Page 8)
3-3.LOADING PANEL ASSY
(Page 8)
3-4.FRONT PANEL ASSY
(Page 9)
3-5.TUNER PACK
(Page 9)
3-13.POWER TRANSFORMER
(T1200)
(Page 13)
3-11.POWER AMP PC BOARD ASSY,
MAIN BOARD
(Page 12)
3-8.CD MECHANISM DECK
(Page 11)
3-7.PANEL BOARD,
CD-SW BOARD
(Page 10)
3-6.TAPE MECHANISM DECK,
MIC BOARD
(Page 10)
3-14.DRIVER BOARD,
SW BOARD
(Page 14)
3-10.PRIMARY BOARD
(Page 12) 3-17.MOTOR (TB) BOARD
(Page 15)
3-18.MOTOR (LD) BOARD
(Page 16)
3-16.SENSOR BOARD
(Page 15)
3-12.SURROUND BOARD,
PA BOARD
(Page 13)
3-9.BACK PANEL
(Page 11)
3-15.CD BOARD
(Page 14)
SET

8
HCD-GNX60/GNX70/GX9900
Note: Follow the disassembly procedure in the numerical order given.
3-2. SIDE PANEL, TOP CASE
3-3. LOADING PANEL ASSY
1 screw (case 3 TP2)
(3X8)
2 two screws
(case 3 TP2)
(3X12)
3 two screws
(+BVTP 3X10
)
4
5
PANEL (SIDE-L)
6 screw
(case 3 TP2)
(3X8)
7 two screws
(case 3 TP2)
(3X12)
8 two screws
(+BVTP 3X10)
9
0
PANEL (SIDE-R)
qa two screws
(+BVTP 3X10)
qs
qd
CASE (TOP)
CD mechanismdeck (CDM74-F1BD81)
1 Turn the pulley to the arrow direction.
Front side
Pulley
2 Pull out disc tray
3
4
loading panel assy

9
HCD-GNX60/GNX70/GX9900
3-4. FRONT PANEL ASSY
3-5.TUNER PACK
1 two screws
(+BVTP 3X10)
2 three screws
(+BVTP 3X10)
3 screw
(+BVTP 3X10)
5 screw
(+BVTP 3X6)
4 screw
(+BVTP 3X10)
6 front panel assy
7 connector
(CN100)
8 CNP508
9 CNP509
q; connector
(CN503)
lug
qa connector
(CN1102)
qs connector
(tape mechanism deck)
2 CNP1
3 tuner pack
4 cover (tuner)
1 two screws
(+BVTP 3X6
)

10
HCD-GNX60/GNX70/GX9900
3-6.TAPE MECHANISM DECK, MIC BOARD
3-7. PANEL BOARD, CD-SW BOARD
1 four screws
(+BVTP2.6 (3CR)
)
2 cover (TCM)
3 screw
(+BVTP2.6 (3CR))
4 tape mechanism deck
5 two screws
(+BVTP2.6 (3CR))
6 bracket (MIC)
8 MIC board
7 two knobs (MIC)
1 knob vol
2 knob (AMS)
3 three screws
(+BVTP2.6 (3CR)
)
4 two screws
(+BVTP2.6 (3CR))
5 two screws
(+BVTP2.6 (3CR))
6 two screws
(+BVTP2.6 (3CR))
7 three screws
(+BVTP2.6 (3CR))
qa three screws
(+BV3 (3CR))
8 connector
(CNS902)
0 PANEL board
qs CD-SW board
9 claw

11
HCD-GNX60/GNX70/GX9900
3-8. CD MECHANISM DECK
3-9. BACK PANEL
MAIN board
2 CD mechanism deck
4 connector
(CN701)
3 CNP505
1 screw
(+BVTP 3X10)
1 connector
(CN1200)
3 three screws (GNX60)
four screws (GNX70/GX9900)
(+BVTP 3X10)
4 two screws
(+BVTP 3X10)
5 two screws
(+BVTP 3X10)
7 connector
(CN580)
6 back panel
2 connector
(CN1204)
GNX70/GX9900 only

12
HCD-GNX60/GNX70/GX9900
3-10. PRIMARY BOARD
3-11. POWER AMP PC BOARD ASSY, MAIN BOARD
1 connector
(CN101)
2 connector
(CN201)
3 screw
(+BVTP 3X8)
4 PRIMARY board
1 connector
(CN1213)
2 connector
(CN1212)
3 screw
(+BVTP 3X6)
4 two screws
(+BVTP 3X6)
5 screw
(+BVTP 3X6)
6 screw
(+BVTP 3X10)
7 power AMP PC board assy
8 two screws
(+BVTP 3X10)
9 screw
(+BVTP 3X10)
q; MAIN board

13
HCD-GNX60/GNX70/GX9900
3-13. POWER TRANSFORMER (T1200)
3-12. SURROUND BOARD, PA BOARD
1 two screws
(+BVTP 3X10)
2 SURROUND board
3 two screws
(+BVTP 3X10)
4 holder
5 three screws
(+BVTP 3X10)
6 two screws
(transistor)
7 two screws
(+BVTP 3X10)
9 screw
(+BVTP 3X10)
8 heat sink
q; bracket
qa PA board
1 connector
(CN1213)
2 connector
(CN1212)
3 two screws
(+BVTP 4X8)
4 two screws (+BVTP 4X8)
5 power transfomer (T1200
)
TRANS board

14
HCD-GNX60/GNX70/GX9900
3-14. DRIVER BOARD, SW BOARD
3-15. CD BOARD
3 connector (CN703)
4 DRIVER board
6 SW board
2 wire (flat type) (CN702)
1 two screws
(+BTTP (M2.6))
5 screw
(+BTTP (M2.6))
1 floating screw
(+PTPWH M2.6)
2 h older (213) ASSY
3 screw
(BVTT M2.6)
4 floating screw
(+PTPWH M2.6)
5 coil spring
(insulator)
6 coil spring
(insulator)
8 insulator
7 insulator
9 t wo screws
(BVTT M2.6)
0 t wo stoppers (BU)
qa two coil springs
(insulator)
qs two insulators
qd
qf
s crew (+BVTP 2.6x 8)
qg Remove the four solderings of motor.
qh CN101 (flat type
)
qj CD board
qk optical pick-up
(KSM-215DCP/C2NP)

15
HCD-GNX60/GNX70/GX9900
3-16. SENSOR BOARD
3-17. MOTOR (TB) BOARD
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)
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

16
HCD-GNX60/GNX70/GX9900
3-18. MOTOR (LD) BOARD
2 Remove the two solderings of motor.
4 MOTOR (LD) board
1 b elt (loading)
5 l oading motor assy (M751)
3 two screws
(+BTTP (M2.6))

17
HCD-GNX60/GNX70/GX9900
[MC TEST MODE]
•This mode is used to check operations of the respective sections
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.
* Check of Amplifier
1. Press [EQ BAND] button repeatedly until a message “GEQ
MAX” appears on the fluorescent indicator tube. GEQ
increases to its maximum.
2. Press [EQ BAND] button repeatedly until a message “GEQ
MIN” appears on the fluorescent indicator tube. GEQ decreases
to its minimum.
3. Press [EQ BAND] button repeatedly until a message “GEQ
FLAT” appears on the fluorescent indicator tube. GEQ set to
flat.
4. When the [MASTER VOLUME] knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears on the fluorescent
indicator tube.
5. When the [MASTER VOLUME] knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and
a message “VOLUME MIN” appears on the fluorescent
indicator tub.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
function is changed toVIDEO automatically. When [CD SYNC]
button is pressed during recording in function, ALC (Automatic
Level Control) is turned on.
2. During recording, turn
M
m
knob to counter clockwise
rotation will change the function to TAPE B and rewind the
tape in deck B until the recording start position and playback
of the tape in deck B is started. If the [REC PAUSE/ START]
button is pressed for a pause and pressed again to resume
recording during recording time, when the tape in deck B is
rewind, the tape in deck B will be rewind until the position
where the pause is applied.
* 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.
[GC TEST MODE]
•This mode is used to check the fluorescent indicator tube,
LEDs, keys, MASTER VOLUME jog, OPERATION
DIAL jog, AMS jog, destination, software version and
VACS level.
Procedure:
1. Press xbutton, [ENTER] button and [DISC 2] button
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up.All LEDs are lighted up in red color. If the system is turned
on, the `/1 LED is lighted up in green color.
3. When you want to enter the software version display mode,
press [DISC 1] button.The model and destination are displayed.
4. Each time [DISC 1] button is pressed, the display changes from
MC version, GC version, SYS version, CD version, CDDM
version, CDMA version, CDMB version, BDA version, BDB
version, ST version, TC version, TA version and TM 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 display returns to the software version 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 J0V0E0 X0”.
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 [OPERATION
DIAL] knob is turned clockwise, or it decreases in the manner
of 0, 9, 8, 7 ... if [OPERATION DIAL] knob is turned 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 manner of 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
triggerd by signal level, B is VACS level which is triggerd by
temperature and CC is VACS level which is triggerd by
APVACS (Abuse Protection VACS).
The signal level, which will trigger VACS A is shown in the
center area of fluorescent indicator tube.
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 you press [EX-CHANGE/DISC SKIP] button again, another
half of alternate segments in fluorescent indicator tube would
light up. Pressing [EX-CHANGE/DISC SKIP] button again
would cause all segments lights up.
10. To release this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
SECTION 4
TEST MODE

18
HCD-GNX60/GNX70/GX9900
[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 xbutton and [ILLUMINATION] button simultaneously.
The message “VACS OFF” or “VACS ON” appears on the
fluorescent indicator tube.
[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 repeatedly 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” orAM 10k STEP” appears on the fluorescent indicator
tube 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 to clockwise
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 on the fluorescent indicator tube.
6. To turn on or off the laser, press [DIRECTION] 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 repeatedly to select the “ALL
DISCS” mode, and press the [REPEAT] button repeatedly to
select “REPEAT OFF” 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