Sony HCDGNX-70 Service manual

HCD-GNX60/GNX70/
GX9900
SERVICE MANUAL
Ver.1.0 2005. 03
• HCD-GNX60/GNX70/GX9900 are the Amplifier, CD player, tape deck and tuner section in MHC-GNX60/GNX70/GX9900.
Photo : HCD-GNX70
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
SPECIFICATIONS
US Model
HCD-GX9900
E Model
Australian Model
HCD-GNX60/GNX70
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
– Continued on next page –
9-879-532-01
2005C0279-1 © 2005.03
Sony Corporation
Audio Group Published by Sony Engineering Corporation
HCD-GNX60/GNX70/GX9900
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, 220 V 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
SAFETY CHECK-OUT
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)
To Exposed Metal
Par ts on Set
AC
0.15 µF
1.5 k
Voltmeter (0.75 V)
Design and specifications are subject to change without notice.
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 0 OR DOTTED LINE WITH MARK 0 ON 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.
2
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.

TABLE OF CONTENTS

HCD-GNX60/GNX70/GX9900
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
3
HCD-GNX60/GNX70/GX9900
SECTION 1

SERVICING NOTES

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 pick­up 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 –
PA RT No.
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
4
SECTION 2
657

GENERAL

LOCATING THE CONTROLS
List of button location s and reference pages
Main unit
ALPHABETICAL ORDER
A – D
ALBUM +/– ql AMP MENU ed AUTO/MANUAL CD el CD SYNC qd Deck A ea Deck B ws DIRECTION qk DISC 1 ~ 3 7 Disc tray 9 DISPLAY rd Display rf
E – L
ECHO LEVEL wf ENTER wa EQ BAND qa EX-CHANGE/DISC SKIP 6 GR
OOVE ILLUMINATION rs IR Receptor r;
eh
3)
2
M – R
MASTER VOLUME 8
MIC 1 (jack) wj MIC 2 (jack) wh MIC LEVEL wg MP3 BOOSTER q;
4)
MPX
qk
OPERATION DIAL wl PHONES (jack) wk Power illuminator wd REC PAUSE/START qh
S – Z
SOUND FLASH e; SPEAKERS SUR SURR SPEAKER MODE
TA P E A/B ej Ta TUNER/BAND ek TUNING +/– qj TV eg VIDEO/MD ef X-ROUND buttons
X-ROUND JOG X-ROUND OFF
3)
1
1)
ws ea
rg
3)
3
3)
4
3)
1
ROUND
pe lid
WA VE/FADER/BALANCE/ RANDOM/TWISTER
2)
rg
HCD-GNX60/GNX70/GX9900
SYMBOLS
?/1 (power) ra Z OPEN/CLOSE 5
nN (play) qs . > (go backward/forward) m M (rewind/fast forward) X (pause) qf
x (stop) qg Z A (Eject A) es
B Z (Eject B) w;
Top Panel
1 2 3
This section is extracted from instruction manual.
1)
For MHC-GNX100/GNX66/ GNX60
2)
For MHC-GNX88/GNX80/
qj
GNX77/GNX70/GX9900
3)
MHC-GNX100 only
ql
4)
For MHC-GNX88/GNX77/ GNX
66
4
Front Panel
rg
rf
rd
rs
ra
r;
el
ek
ej
eh
eg
ef
ed
es
ea
e;
wl
8
9
0
qa
qs
qd
qf
qg
qh
qj
qk
ql
w;
wz
ws
wd
wk wgwhwj
wf
5
HCD-GNX60/GNX70/GX9900
Remote control
ALPHABETICAL ORDER
A – E
ALBUM + qf ALBUM – qh CD wf CLEAR qk CLOCK/TIMER SELECT 2 CL
OCK/TIMER SET DISC SKIP qd DISPLAY wh ENTER qs EQ qj
F – Z
FM MODE 6 FUNCTION 8 PLAY MODE 5 REPEAT 6 SLEEP 1
4
TA P E wd TUNER/BAND 7 TUNE
R MEMORY
wg TUNING MODE 5 VOLUME +/– qg
The + button has
SYMBOLS
a tactile dot.*
?/1 (power) 3 x (s
top)
qa
X (pause) ql N (play) w; –. (go backward) ws >+
(go forward)
wa
m (rewind) q; M (fast forward) 9
wf
wa
ql
wh
wg
wd
ws
w;
qk
qj
qh
This section is extracted from instruction manual.
312
4
5
6
7
8
9
q;
qa
qs
qd
qf qg
*Use the tactile dot as a reference
when operating the system.
6
• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET
3-2.SIDE PANEL, TOP CASE
(Page 8)
3-3.LOADING PANEL ASSY
(Page 8)
3-4.FRONT PANEL ASSY
(Page 9)
HCD-GNX60/GNX70/GX9900
SECTION 3

DISASSEMBLY

3-5.TUNER PACK
(Page 9)
3-8.CD MECHANISM DECK
(Page 11)
3-9.BACK PANEL
(Page 11)
3-11.POWER AMP PC BOARD ASSY, MAIN BOARD (Page 12)
3-6.TAPE MECHANISM DECK, MIC BOARD (Page 10)
3-14.DRIVER BOARD,
SW BOARD
(Page 14)
3-10.PRIMARY BOARD (Page 12)
3-7.PANEL BOARD, CD-SW BOARD (Page 10)
3-15.CD BOARD
(Page 14)
3-13.POWER TRANSFORMER (T1200) (Page 13)
3-16.SENSOR BOARD
(Page 15)
3-17.MOTOR (TB) BOARD
(Page 15)
3-12.SURROUND BOARD,
PA BOARD
(Page 13)
3-18.MOTOR (LD) BOARD
(Page 16)
7
HCD-GNX60/GNX70/GX9900
)
Note: Follow the disassembly procedure in the numerical order given.

3-2. SIDE PANEL, TOP CASE

7
two screws
PANEL (SIDE-R)
0
9
6
screw (case 3 TP2) (3X8)
(case 3 TP2) (3X12)
8
two screws
(+BVTP 3X10)
qd
CASE (TOP)
qs
qa
two screws
(+BVTP 3X10)
2
two screws (case 3 TP2) (3X12)

3-3. LOADING PANEL ASSY

CD mechanismdeck (CDM74-F1BD81)
1
Turn the pulley to the arrow direction.
Pulley
Front side
2
Pull out disc tray
loading panel assy
4
3
4
5
1
screw (case 3 TP2)
(3X8)
3
two screws
(+BVTP 3X10
PANEL (SIDE-L)
8

3-4. FRONT PANEL ASSY

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)
)
HCD-GNX60/GNX70/GX9900

3-5. TUNER PACK

2
CNP1
3
tuner pack
1
two screws
(+BVTP 3X6
4
cover (tuner)
9
HCD-GNX60/GNX70/GX9900
)
)

3-6. TAPE MECHANISM DECK, MIC BOARD

3
screw
(+BVTP2.6 (3CR))
2
cover (TCM)
4
tape mechanism deck
5
two screws
(+BVTP2.6 (3CR))
6
bracket (MIC)
1
four screws
(+BVTP2.6 (3CR)
7
two knobs (MIC)

3-7. PANEL BOARD, CD-SW BOARD

qa
three screws
(+BV3 (3CR))
qs
CD-SW board
9
claw
1
knob vol
8
MIC board
7
three screws
(+BVTP2.6 (3CR))
6
(+BVTP2.6 (3CR))
8
connector
(CNS902)
two screws
5
(+BVTP2.6 (3CR))
4
(+BVTP2.6 (3CR))
0
two screws
two screws
3
three screws
(+BVTP2.6 (3CR)
PANEL board
10
2
knob (AMS)

3-8. CD MECHANISM DECK

2
CD mechanism deck
4
connector
(CN701)
3
CNP505
HCD-GNX60/GNX70/GX9900
1
screw
(+BVTP 3X10)

3-9. BACK PANEL

2
connector
(CN1204)
7
connector
(CN580)
MAIN board
6
back panel
1
connector
(CN1200)
GNX70/GX9900 only
5
two screws
(+BVTP 3X10)
4
two screws
(+BVTP 3X10)
3
three screws (GNX60) four screws (GNX70/GX9900)
(+BVTP 3X10)
11
HCD-GNX60/GNX70/GX9900

3-10. PRIMARY BOARD

4
PRIMARY board
1
connector
(CN101)
3
screw
(+BVTP 3X8)
2
connector
(CN201)

3-11. POWER AMP PC BOARD ASSY, MAIN BOARD

4
two screws
(+BVTP 3X6)
3
screw
(+BVTP 3X6)
1
connector
(CN1213)
2
connector
(CN1212)
5
screw
(+BVTP 3X6)
7
power AMP PC board assy
6
screw
(+BVTP 3X10)
12
q;
MAIN board
8
two screws
(+BVTP 3X10)
9
screw
(+BVTP 3X10)

3-12. SURROUND BOARD, PA BOARD

)
8
heat sink
3
two screws
(+BVTP 3X10)
4
holder
2
SURROUND board
q;
bracket
9
(+BVTP 3X10)
HCD-GNX60/GNX70/GX9900
1
two screws
(+BVTP 3X10)
screw
qa
PA board

3-13. POWER TRANSFORMER (T1200)

3
two screws (+BVTP 4X8)
1
connector
(CN1213)
2
connector
(CN1212)
7
(+BVTP 3X10)
TRANS board
two screws
6
two screws
(transistor)
5
three screws
(+BVTP 3X10)
4
two screws (+BVTP 4X8)
5
power transfomer (T1200
13
HCD-GNX60/GNX70/GX9900
)

3-14. DRIVER BOARD, SW BOARD

1
two
screws
(+BTTP (M2.6))
4
DRIVER
2
wire (flat type) (CN702)
board
3
connector (CN703)
5
screw
(+BTTP (M2.6))
6
SW board

3-15. CD BOARD

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

3-16. SENSOR BOARD

2
t
ray
1
floating
(+PTPWH M2.6)
6
floating
(+PTPWH M2.6)
7
g
screw
8
(+BTTP (M2.6))
screw
ear (geneva)
s
crew
0
SENSOR board
9
connector
(
CN731)
HCD-GNX60/GNX70/GX9900
3
b
elt (table)
4
floating
(+PTPWH M2.6)
5
screw
p
ulley (table)

3-17. MOTOR (TB) BOARD

2
stopper
4
1
stopper
7
t
able motor assy (M741)
wire (flat type) 5 core (CN742)
3
8
MOTOR (TB) board
6
Remove the two solderings of motor.
5
two
screws
(+BTTP (M2.6))
15
HCD-GNX60/GNX70/GX9900

3-18. MOTOR (LD) BOARD

2
Remove the two solderings of motor.
5
l
oading motor assy (M751)
3
two
screws
(+BTTP (M2.6))
4
MOTOR (LD) board
1
b
elt (loading)
16
SECTION 4

TEST MODE

HCD-GNX60/GNX70/GX9900
[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 VA CS level.
Procedure:
1. Press x button, [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
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.
.
knob is turned counter-clockwise.
>
.
>
[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 x button, [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 to VIDEO automatically. When [CD SYNC] button is pressed during recording in function, ALC (Automatic Level Control) is turned on.
2. During recording, turn 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
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 x button, [ENTER] button, and
simultaneously.
2. The fluorescent indicator tube becomes blank for a while, and the set is reset.
m
knob to counter clockwise
M
button.
?/1
?/1
button
17
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
2. Press x button and [ILLUMINATION]
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
2. Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press
4. Press [ENTER] button and system will turn ON automatically. The message “AM 9k
STEP” or AM 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.
button to turn the set ON.
?/1
button to turn the set ON.
?/1
button to turn the set OFF.
?/1
button simultaneously.
button simultaneously. The
?/1
[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
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 power cord to turn the power OFF.
Aging mode sequence:
button to turn the set ON
?/1
Start (from disc 1)
Disc chucking
button or disconnect the
?/1
Procedure:
1. Press
2. Select CD function.
3. Press x , [ENTER] button, and
simultaneously.
4. The CD service mode is activated. The message “SERVICE MODE” appears.
5. With the CD in stop status, turn rotation to move the optical pick-up to outside track, or turn
m
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
button to turn the set ON.
?/1
knob to counterclockwise rotation to move to
M
?/1
Z
m
button.
OPEN/CLOSE
knob to clockwise
M
button
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
18
HCD-GNX60/GNX70/GX9900
• Display when an error occurred (CD Error Code Mode)
Procedure:
1. Press x button, [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
knob is rotated, display change as
M
below.
Display of total error
>
>
+
direction
Display of Mechanical errors
+
direction
Display of no disc errors
.
.
direction
direction
4. To clear the error record, operate the cold reset. (Refer to the “COLD RESET”)
5. To release this mode, press the
button or disconnect
?/1
the power cord to turn the power OFF.
1) Display of total error
Display
Em**Ed**
3) Display of no disc errors
Display
D*$$%%&&##00
D*: The number of mechanical error (“00” is latest one) (Rotate
.
error) $$: 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.
knob in the direction of either to display next
>
EM**: The number of mechanical errors. ED**: The number of no disc errors after chucking the disc.
2) Display of mechanical errors
Display
M*$$%%&&##00
M*: The number of mechanical error (“00” is latest one) (Rotate
.
error) $$: Not used %%: Loading related error (Second figure is not used)
D: Stop by the problem other than mechanical problem while
closing.
E: Stop by the problem other than mechanical problem while
opening.
C: Stop by the problem other than mechanical problem while
chucking up.
F: Stop by 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
knob in the direction of either to display next
>
Procedure:
1. Press
button to turn the set ON.
?/1
2. Select CD function.
3. Press x button, [CD] button and [DISC 1] button
simultaneously to enter the CD repeat 5 limit off mode and the message “LIMIT OFF” appears on the fluorescent indicator tube .
4. To release this mode, operate the cold reset. (Refer to the “ 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
button to turn the set ON.
?/1
2. Select CD function.
3. Press x
button,
[CD]
button and
button simultaneously.
?/1
The set will power off automatically.
4. After the “STANDBY” blinking display finish, a message “LOCK” appears on the fluorescent indicator tube and the CD ship mode is set.
19
HCD-GNX60/GNX70/GX9900
[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
2. Select CD function.
3. Press [CD] button and will power off automatically.
4. After the “STANDBY” blinking display finish, the message “LOCK” appears on the fluorescent indicator tube and the CD ship mode is set.
[CD POWER MANAGE]
•This mode let you switch on or off, the 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
2. Select CD function.
3. Press
4. Press x button and
will power on automatically.
5. The message “CD POWER ON” or “CD POWER OFF” appears on the fluorescent indicator tube.
button to turn the set ON.
?/1
?/1
button to turn the set ON.
?/1
button to turn the set OFF.
?/1
?/1
button simultaneously. The set
button simultaneously. The set
[CD TRAY LOCK MODE]
•This mode let you lock the disc trays. When this mode is activated, the disc tray will not open when button or [EX-CHANGE/DISC SKIP] button is pressed. The
message “LOCKED” appears on the fluorescent indicator tube.
Procedure:
1. Press
2. Select CD function.
3. Press x button and
simultaneously and hold down until “LOCKED” or “UNLOCKED” appears 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
2. Select VIDEO function.
3. Press [VIDEO/MD] button and The function will change to MD. Press the same buttons again
to change from MD to VIDEO.
[REMOTE COMMANDER DISABLE MODE]
• This mode let you disable the remote commander reception. When this mode is activated, the set will not response if the button on the remote commander is pressed. The message “RemoteDisable” will be displayed on the fluorescent indicator tube. Use this mode during aging to avoid disturbance.
• Procedure:
1. Press x button, [GROOVE] button and [DISC 2] button
simultaneously. The message “RemoteDisable” appears on the fluorescent indicator tube. To enable the remote commander reception, press the same buttons again. The message “RemoteEnable” appears on the fluorescent indicator tube.
button to turn the set ON.
?/1
Z
button to turn the set ON.
?/1
OPEN/CLOSE
?/1
OPEN/CLOSE
Z
button
button simultaneously.
20
HCD-GNX60/GNX70/GX9900
set
MAIN board CN510 Pin
1
(L-CH)
Pin
3
(R-CH)
MAIN board CN510 Pin
2
(GND)
+
level meter
test tape P-4-A100 (10 kHz, –10 dB)
SECTION 5

MECHANICAL ADJUSTMENTS

Precaution
1. Clean the following parts with a denatured alcohol-moistened swab: record/playback heads pinch rollers erase head rubber belts capstan idlers
2. Demagnetize the record/playback head with a head demagnetizer.
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
Mode Torque meter Meter reading
3.06 N • m to 6.96 N • m
FWD CQ-102C 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
FWD back tension
REV CQ-102RC 31 to 71 g • cm
REV back tension
FF/REW CQ-201B 71 to 143 g • cm
FWD tension CQ-403A 100 g or more
REV tension CQ-403R 100 g or more
CQ-102C 2 to 6 g • cm
CQ-102RC 2 to 6 g • cm
0.19 N • m to 0.58 N • m
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
(0.98 – 1.99 oz • inch)
9.80 N • m
(3.53 oz or more)
9.80 N • m
(3.53 oz or more)
SECTION 6

ELECTRICAL ADJUSTMENTS

DECK SECTION
1. Demagnetize the record/playback head with a head demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
•Test Tape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUST-MENT
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
0 dB=0.775 V
21
HCD-GNX60/GNX70/GX9900
e
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.
Output level
within 1dB
L-CH peak
R-CH peak
within 1dB
Screw position
L-CH peak
Screw position
R-CH peak
3. Mode: Playback
test tape P-4-A100 (10 kHz, –10 dB)
L-CH
MAIN board CN510 set
R-CH
waveform of oscilloscope
pin
L
R
pin
1
pin
3
2
oscilloscop
H
V
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. Therefore, 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 10M impedance.
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:
oscilloscope
CD board
TPO102 (FE1)
TP117 (VC)
Procedure:
1. Connect an oscilloscope to test point TPO102 (FE1) and TP 117(VC) 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
2.4 ± 1 Vp-p.
+ –
in phase 45°90°135°180
good
°
wrong
4. After the adjustments, apply suitable locking compound to the pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
S-curve waveform
symmetry
A
within 2.4
B
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 (SIDE B)
(See page 24.)
±
1 Vp-p
22
forward
reverse
HCD-GNX60/GNX70/GX9900
RFAC Level Check
Connection:
oscilloscope
CD board
TP124 (RFAC)
TP117 (VC)
+ –
Procedure:
1. Connect an oscilloscope to test point TP124 (RFAC) and TP 117(VC) 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
RFAC signal waveform
clearly distinguished at the center of the waveform.
VOLT/DIV: 200 mV TIME/DIV: 500 ns
level: 0.9 ± 0.4 Vp-p
E-F Balance Check
Connection:
oscilloscope
CD board
TPO103 (TE1)
TP117 (VC)
+ –
Procedure:
1. Connect an oscilloscpe to test point TPO103 (TE1) and TP117 (VC) on the CD board.
2. Turn the power on.
3. Select the function “CD”.
4. Press three buttons of [ENTER], M , and [SURRUUND MODE] simultaneously to set the CD service mode.
5. Put the disc (YEDS-18) in to playback the number five track.
6. Press the . button. The message “TRAVERSE” is displayed. (The tracking servo and the sledding servo are turned OFF)
7. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 22%
Tr averse Waveform
Center of the waveform
Checking Location: CD board (SIDE B)
(See page 24.)
B
0V
level: 1.0 ± 0.5 Vp-p
8. Press the . button. The message “TRAVERSE” is
A (DC
voltage)
displayed. (The tracking servo and sledding servo are turned ON) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 5.
9. 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.
Tr averse Waveform
0V
Tr acking servo
Sled servo
OFF
Tr acking servo
Sled servo
ON
Checking Location: CD board (SIDE B) (See page 24.)
C (DC voltage)
23
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