Sony HCD-GNX780, HCD-GNX880 Service Manual
HCD-GNX780/GNX880
SERVICE MANUAL
Ver. 1.1 2006.09
• HCD-GNX780/GNX880 is the Amplifier,
Disc player, tape deck and tuner
section in MHC-GNX780/GNX880.
Model Name Using Similar Mechanism HCD-GN880
CD CD Mechanism Type CDM74KF-F1BD84
Section Base Unit Name BU-F1BD84
Optical Pick-up Name KSM-215DCP/C2NP
TAPE Model Name Using Similar Mechanism HCD-GNX80
Section Tape Transport Mechanism Type CWN42FF601
Mexican Model
Photo: HCD-GNX880
Amplifier section
HCD-GNX880
The following are measured at AC 127 V, 60 Hz
Front/Surround speaker
DIN power output (rated) 180 + 180 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
225 + 225 watts
(6 ohms at 1 kHz, 10% THD)
Subwoofer
Continuous RMS power output (reference)
200 watts
(8 ohms at 100 Hz, 10% THD)
HCD-GNX780
The following are measured at AC 127 V, 60 Hz
Front speaker
DIN power output (rated) 210 + 210 watts
(4 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
285 + 285 watts
(4 ohms at 1 kHz, 10% THD)
SPECIFICATIONS
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
VIDEO OUT (phono jack): max. output level
1 Vp-p, unbalanced, Sync negative,
load impedance
75 ohms
PHONES (stereo mini jack): accepts headphones of 8 ohms or more
FRONT SPEAKER/SURROUND SPEAKER/
SUBWOOFER OUT: Use only the supplied speaker
– Continued on next page –
9-887-130-02
2006I02-1
© 2006.09
MiNi Hi-Fi COMPONENT SYSTEM
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
HCD-GNX780/GNX880
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
(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 530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 1,710 kHz
(with the interval set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements 127 V AC, 60Hz
Power consumption
MHC-GNX880 350 watts
MHC-GNX780 250 watts
Dimensions (w/h/d) (Approx.) 281 × 362 × 404.5 mm
Mass (Approx.)
HCD-GNX880 13.7 kg
HCD-GNX780 12.0 kg
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.
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.
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
TABLE OF CONTENTS
HCD-GNX780/GNX880
1. SERVICING NOTES ................................................ 4
2. GENERAL
Locating the Controls ...................................................... 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Side Panel, Top Case ....................................................... 8
3-3. Loading Panel .................................................................. 8
3-4. Front Panel Assy.............................................................. 9
3-5. Tuner Pack ....................................................................... 9
3-6. Tape Mechanism Deck, MIC Board ................................ 10
3-7. CD-SW Board, PANEL Board ........................................ 10
3-8. FUNCTION Board, JOG Board ...................................... 11
3-9. CD Mechanism Deck ...................................................... 11
3-10. Back Panel ....................................................................... 12
3-11. PRIMARY Board, EFFECTOR Board............................ 12
3-12. Power Amp PC Board Assy, MAIN Board ..................... 13
3-13. SURROUND Board, PA Board ....................................... 13
3-14. Power Transformer (T1200) ............................................ 14
3-15. CDG Board, DRIVER Board, SW Board ....................... 14
3-16. BD84 Board ..................................................................... 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
CDG Section.................................................................... 22
7. DIAGRAMS
7-1. Block Diagram – CDG Section – ................................... 27
7-2. Block Diagram – Tape/Tuner Section – ......................... 28
7-3. Block Diagram – Main Section – ................................... 29
7-4. Block Diagram – AMP Section – ................................... 30
7-5. Block Diagram – Display/Power Section – .................... 31
7-6. Printed Wiring Board – BD84 Board – .......................... 32
7-7. Schematic Diagram – BD84 Board – ............................. 33
7-8. Printed Wiring Boards – CD Mechanism Sectiom – ...... 34
7-9. Schematic Diagram – CD Mechanism Section – ........... 35
7-10. Printed Wiring Board – 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 Board – PANEL Board – ....................... 40
7-15. Schematic Diagram – PANEL Board – ........................... 41
7-16. Printed Wiring Boards
– CD-SW, JOG, MIC and FUNCTION Boards – ........... 42
7-17. Schematic Diagram
– CD-SW, JOG, MIC and FUNCTION Boards – ........... 43
7-18. Printed Wiring Board – PA Board – ............................... 44
7-19. Schematic Diagram – PA Board – .................................. 45
7-20. Printed Wiring Board – SURROUND Board – .............. 46
7-21. Schematic Diagram – SURROUND Board – ................. 47
7-22. Printed Wiring Board – EFFECTOR Board – ................ 48
7-23. Schematic Diagram – EFFECTOR Board – ................... 49
7-24. Printed Wiring Board – CDG Board – ........................... 50
7-25. Schematic Diagram – CDG Board – .............................. 51
7-26. Printed Wiring Boards – Power Section – ...................... 52
7-27. Schematic Diagram – Power Section – .......................... 53
7-28. IC Pin Function Description ............................................ 58
8. EXPLODED VIEWS
8-1. Case (Top), Back Panel Section ...................................... 64
8-2. Front Panel Section-1 ...................................................... 65
8-3. Front Panel Section-2 ...................................................... 66
8-4. Chassis Section ................................................................ 67
8-5. CD Mechanism Deck Section-1
(CDM74KF-F1BD84) ..................................................... 68
8-6. CD Mechanism Deck Section-2
(CDM74KF-F1BD84) ..................................................... 69
9. ELECTRICAL PARTS LIST ................................ 70
3
HCD-GNX780/GNX880
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.
4
LOCATING THE CONTROLS
Main unit
ALPHABETICAL ORDER
A – D
ALBUM +/– ql
AMP MENU ed
CD r;
CD SYNC qf
Deck A ef
Deck B ws
DELAY ea
DIRECTION wd
DISC 1 ~ 3 1
Disc tray qs
DISPLAY 6
Display q;
E – L
ECHO LEVEL wh
ENTER wg
EQ BAND wf
EX-CHANGE/DISC SKIP 2
FLANGER 7
GROOVE w;
ILLUMINATION 5
IR Receptor ra
KARAOKE wd
Top Panel
M – R
MASTER VOLUME wk
MIC 1/2 (jack) wl
MIC 1/2 LEVEL wj
MP3 BOOSTER qa
OPEN/CLOSE 3
OPERATION DIAL 4
PHONES (jack) es
Power illuminator 9
REC PAUSE/START qd
S – Z
SOUND FLASH e;
SURROUND
SURR SPEAKER MODE
TAPE A/B ek
Tape lid ws ef
TUNER/BAND el
TUNING +/– qk
TV ej
VIDEO/MD eh
1)
8
SECTION 2
GENERAL
SYMBOLS
?/1 (power) rs
Z OPEN/CLOSE 3
N (play) qg
>/. (forward/go
M/m (fast forward/rewind)
X (pause) qh
x (stop) qj
A Z (Eject A) eg
B Z (Eject B) wa
1)
For MHC-GNX780
2)
For MHC-GNX880
2)
8
1
2
HCD-GNX780/GNX880
This section is extracted
from instruction manual.
backward) qk
ql
3
Front Panel
rs
ra
r;
el
ek
ej
eh
eg
ef
ed
56
4
78 9q;qaqs
qd
qf
qg
qh
qj
qk
ql
w;
wa
ws
wd
wf
wg
whwjwkwle;eaes
5
HCD-GNX780/GNX880
Remote control
ALPHABETICAL ORDER
A – E
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
F – Z
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
The + button has a tactile dot.*
SYMBOLS
?/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
*Use the tactile dot as a reference
when operating the system.
wh
wg
wf
wd
ws
wa
w;
ql
qk
qj
qh
12
This section is extracted
from instruction manual.
3
4
5
6
7
8
9
q;
qa
qs
qd
qf
qg
Setting the clock
Use buttons on the remote for the operation.
1
Press ?/1 to turn on the system.
2
Press CLOCK/TIMER SET.
“CLOCK” appears in the display. Then, the
hour indication flashes in the display.
3
Press –. or >+ repeatedly to set
the hour.
4
Press ENTER.
The minute indication flashes in the
display.
5
Press –. or >+ repeatedly to set
the minute.
6
Press ENTER.
The clock starts functioning.
To adj ust the c lock
1
Press CLOCK/TIMER SET.
“SET” appears in the display, then “PLAY
SET?” flashes in the display.
2
Press –. or >+ repeatedly to select
“CLOCK SET?”, then press ENTER.
The hour indication flashes in the display.
3
Do the same procedures as step 3 to 6
above.
Not es
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
You cannot set the clock in Power Saving Mode
.
6
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SET
HCD-GNX780/GNX880
SECTION 3
DISASSEMBLY
3-2.SIDE PANEL, TOP CASE
(Page 8)
3-3.LOADING PANEL
(Page 8)
3-4.FRONT PANEL ASSY
(Page 9)
3-5.TUNER PACK
(Page 9)
3-9.CD MECHANISM DECK
(Page 11)
3-6.TAPE MECHANISM DECK,
MIC BOARD
(Page 10)
3-7.CD-SW BOARD,
PANEL BOARD
(Page 10)
3-8.FUNCTION BOARD,
JOG BOARD
(Page 11)
3-10.BACK PANEL
(Page 12)
3-12.POWER AMP PC BOARD ASSY,
MAIN BOARD
(Page 13)
3-13.SURROUND BOARD,
PA BOARD
(Page 13)
3-15.CDG BOARD,
DRIVER BOARD,
SW BOARD
(Page 14)
3-16.BD84 BOARD
(Page 15)
3-11.PRIMARY BOARD
EFFECTOR BOARD
(Page 12)
3-17.SENSOR BOARD
(Page 15)
3-18.MOTOR (TB) BOARD
(Page 16)
3-14.POWER TRANSFORMER
(T1200)
(Page 14)
3-19.MOTOR (LD) BOARD
(Page 16)
7
HCD-GNX780/GNX880
Note: Follow the disassembly procedure in the numerical order given.
3-2. SIDE PANEL, TOP CASE
7
two screws
PANEL (SIDE-L)
0
9
6
screw
(case 3 TP2)
(3×8)
(case 3 TP2)
×
12)
(3
8
two screws
(+BVTP 3
qd
CASE (TOP)
×
10)
qa
two screws
(+BVTP 3
qs
×
12)
2
two screws
(case 3 TP2)
×
12)
(3
3-3. LOADING PANEL
CD mechanism deck (CDM74KF-F1BD84)
1
Turn the pulley to the arrow direction.
Pulley
Front side
2
Pull out disc tray
3
loading panel
4
4
5
1
screw (case 3 TP2)
×
8)
(3
3
two screws
(+BVTP 3
PANEL (SIDE-R)
×
10)
8
3-4. FRONT PANEL ASSY
4
screw
(+BVTP 3
5
front panel assy
8
wire (flat type)
(CN509)
×
10)
7
wire (flat type)
(CN508)
3
screw
(+BVTP 3
6
(CN100)
×
10)
q;
connector
(CN1102)
HCD-GNX780/GNX880
connector
3-5. TUNER PACK
2
three screws
(+BVTP 3
×
10)
qa
connector
(CN507)
1
three screws
(+BVTP 3
2
wire (flat type)
(CN1)
×
10)
9
connector
(CN503)
3
tuner pack
1
two screws
(+BVTP 3×6)
9
HCD-GNX780/GNX880
)
d
3-6. TAPE MECHANISM DECK, MIC BOARD
1
three screws
(+BVTP2.6 (3CR))
2
two screws
(+BVTP2.6 (3CR)
3
tape mechanism deck
4
three screws
(+BVTP2.6 (3CR))
5
bracket (MIC)
6
knob (MIC)
3-7. CD-SW BOARD, PANEL BOARD
2
Pull up the bracket portion of button (DISC) in the arrow A direction and
pull out CD-SW board in the arrow
button (DISC)
CD-SW board
(side view)
bracket portion
A
B
button (DISC)
direction.
A
button (DISC)
B
B
bracket portion
CD-SW board
1
two screws
(+BVTP2.6 (3CR))
3
CD-SW board
7
MIC board
4
three screws
(+BVTP2.6 (3CR))
5
three screws
(+BVTP2.6 (3CR))
8
PANEL boar
10
6
wire (flat type)
(CN900)
7
wire (flat type)
(CN902)
3-8. FUNCTION BOARD, JOG BOARD
7
JOG board
6
two screws
(+BVTP2.6 (3CR))
4
knob jog assy
5
two screws
(+BVTP2.6 (3CR))
1
knob vol
3
FUNCTION board
HCD-GNX780/GNX880
2
nine screws
(+BVTP2.6 (3CR))
3-9. CD MECHANISM DECK
2
CD mechanism deck
5
(CN560)
4
(CN701)
connector
wire (flat type)
3
wire (flat type)
(CN505)
1
two screws (+BVTP 3×8)
6
(CN504)
wire (flat type)
MAIN board
11
HCD-GNX780/GNX880
3-10. BACK PANEL
2
(CN1204)
9
connector
(CN580)
8
back panel
connector
1
connector
(CN1200)
3
wire (flat type)
(CN1501)
5
two screws
(+BVTP 3×12)
4
five screws
(+BVTP 3×10)
7
two screws
(+BVTP 3×12)
6
two screws (GNX880)
screw (GNX780)
(+BVTP 3×10)
3-11. PRIMARY BOARD, EFFECTOR BOARD
1
connector
(CN101)
4
PRIMARY board
3
screw
(+BVTP 3
×
8)
6
EFFECTOR board
2
(CN201)
connector
5
two screws
(+BVTP 3
×
10)
12
3-12. POWER AMP PC BOARD ASSY, MAIN BOARD
4
two screws
(+BV3 (3-CR))
3
screw
(+BV3 (3-CR))
1
connector
(CN1213)
2
connector
(CN1212)
5
screw
(+BV3 (3-CR))
7
power AMP PC board assy
6
screw
(+BVTP 3
×
10)
8
(CN105)
HCD-GNX780/GNX880
(GNX880)
connector
3-13. SURROUND BOARD, PA BOARD
0
heat sink
5
two screws
(+BVTP 3
×
10)
qa
MAIN board
3
SURROUND board
9
two screws
(+BVTP 3
qs
bracket
×
10)
1
two screws
(+BVTP 3
2
two screws
(transistor)
(GNX880)
q;
screw
(+BVTP 3
×
10)
×
10)
6
qd
PA board
4
connector
(CN607)
holder
(GNX880)
9
two screws
(+BVTP 3
×
10)
qa
screw
(+BVTP 3
7
three screws
(+BVTP 3
×
10)
8
two screws
(transistor)
×
10)
13
HCD-GNX780/GNX880
)
)
3-14. POWER TRANSFORMER (T1200)
1
connector
(CN1213)
2
connector
(CN1212)
3
two screws
TRANS board
5
power transfomer (T1200
4
two screws
3-15. CDG BOARD, DRIVER BOARD, SW BOARD
1
two
screws
(+BVTP 3
4
cover (CDM)
5
two
screws
(+BTTP (M2.6))
8
DRIVER
6
wire (flat type) (CN702)
board
2
CDG
×
10)
7
connector (CN703)
0
SW board
board
3
three
(+BVTP 3
9
(+BTTP (M2.6))
screws
screw
×
10
14
3-16. BD84 BOARD
2
h
older (213) ASSY
qh
optical pick-up
(KSM-215DCP/C2NP)
0
two
insulators
9
two
coil springs
(insulator)
8
t
wo stoppers (BU)
qa
HCD-GNX780/GNX880
1
floating
(+PTPWH M2.6)
6
two
5
(insulator)
3
screw
(+BTTP (M2.6))
4
floating
(+PTPWH M2.6)
screw
insulators
two
coil springs
screw
3-17. SENSOR BOARD
2
t
ray
7
(+BTTP (M2.6))
qd
Remove the four solderings of motor.
1
floating
(+PTPWH M2.6)
6
floating
(+PTPWH M2.6)
screw
8
s
(+BTTP (M2.6))
screw
t
wo screws
crew
0
SENSOR board
9
connector
(
CN731)
qf
CN101 (flat type)
qg
BD84
qs
s
crew (+BVTP 2.6 (3CR))
3
b
elt (table)
4
floating
(+PTPWH M2.6)
5
screw
p
ulley (table)
board
7
g
ear (geneva)
15
HCD-GNX780/GNX880
3-18. MOTOR (TB) BOARD
2
stopper
4
1
stopper
7
t
able motor assy (M741)
3-19. MOTOR (LD) BOARD
4
5
l
oading motor assy (M751)
5
(+BTTP (M2.6))
Remove the two solderings of motor.
3
wire (flat type) 5 core (CN742)
8
MOTOR (TB) board
6
Remove the two solderings of motor.
two
screws
2
two
screws
(+BTTP (M2.6))
3
MOTOR (LD) board
16
1
b
elt (loading)
SECTION 4
TEST MODE
HCD-GNX780/GNX880
[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube,
LEDs, keys, VOLUME jog, OPERATION DIAL jog, AMS
jog, destination, software version and VACS 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.
3. When you want to enter the software version display mode,
press [DISC 1] button. The model is displayed.
Press [DISC 1] button again to show destination.
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, 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 V0J0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into
account.
“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.
“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 counterclockwise.
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 FAPC”. A is VACS level which is
trigger by signal level, B is VACS level which is trigger by
temperature and C is VACS level which is trigger by APVACS
(Abuse Protection VACS).
F is shown if the fan is turned in high speed and vice-versa.
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.
[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 B indicators flash on the
fluorescent indicator tube. The function is changed to TV.
* 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 is 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 on the fluorescent indicator tube.
5. When the [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 tube.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
function is changed to TV automatically. When [CD SYNC]
button is pressed during recording in function, ALC (Automatic
Logic Control) is turned on.
2. During recording, press
the function is changed 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 is rewind, the tape 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.
will stop the recording and
m
button.
?/1
?/1
button
17
HCD-GNX780/GNX880
[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 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
[CD 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 on the remote repeatedly to select
the “ALL DISCS” mode, and press the [REPEAT] button on
the remote 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 on the fluorescent indicator tube.
5. With the CD in stop status, press
pick-up to outside track, or press
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 “LD ON” or “LD OFF” appears on the fluorescent
indicator tube.
7. To release this mode, press
button to turn the set ON.
?/1
?/1
OPEN/CLOSE
Z
to move the optical
M
to move to inside
m
button.
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-GNX780/GNX880
• 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
“MC COLD RESET”)
5. To release this mode, press the
button or disconnect
?/1
the power plug 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 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
button to turn the set ON.
?/1
2. Select CD function.
3. Press x
simultaneously.
button,
[SOUND FLASH]
button and
The set will power off automatically.
?/1
button
4. After the “STANDBY” blinking display finish, a message
“MECHA LOCK” is displayed on the fluorescent indicator
tube and the CD ship mode is set.
19
HCD-GNX780/GNX880
[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, a message
“MECHA 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
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” will
be displayed 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” will be displayed in the will be displayed
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” 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
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.
[TCM OFFLINE MODE]
• This mode prevents set from power off automatically when
TCM is not connected.
Therefore, measurements can be done even when TCM is not
connected during production.
• Procedure:
1. When the system in turned off, press [EQ BAND] button,
[TAPE A/B] button and
set will power on automatically.
2. The message “TCM OFFLINE” will be displayed on the
fluorescent indicator tube.
button to turn the set ON.
?/1
Z
button to turn the set ON.
?/1
OPEN/CLOSE
?/1
button simultaneously. The
?/1
OPEN/CLOSE
Z
button
button simultaneously.
20
HCD-GNX780/GNX880
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
2.9 mN • m to 6.9 mN • m
FWD CQ-102C 30 to 70 g • cm
(0.42 – 0.97 oz • inch)
FWD
back tension
FF/REW CQ-201B 49 to 170 g • cm
CQ-102C 1.6 to 6 g • cm
0.15 mN • m to 0.59 mN • m
(0.022 – 0.08 oz • inch)
4.8 mN • m to 16.7 mN • m
(0.69 – 2.36 oz • inch)
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 RCH.
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 ADJUSTMENT
DECK A DECK B
0 dB=0.775 V
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
set
MAIN board
CN510
Pin
1
(L-CH)
3
(R-CH)
Pin
MAIN board
CN510
2
(GND)
Pin
level meter
+
–
21
HCD-GNX780/GNX880
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
CDG 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 10MΩ 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
JPO102 (FE1)
TP117 (VC)
Procedure:
1. Connect an oscilloscope to test point JPO102 (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
azimuth
screw
HCD-GNX780/GNX880
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
JPO103 (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
HCD-GNX780/GNX880
Checking Location:
– BD84 BOARD (SIDE B) –
TP117 (VC)
JPO103 (TE1)
JPO102 (FE1)
IC101
TP124 (RFAC)
24
SECTION 7
DIAGRAMS
HCD-GNX780/GNX880
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 V or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and 1/
specified.
•%: indicates tolerance.
• f : internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
Note: The components identified by mark 0 or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• C : panel designation.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
•Voltages and waveforms are dc with respect to ground
under no-signal conditions.
BD84 board
no mark: CD PLAY
Other boards
no mark: TUNER (FM/AM)
( ) : CD PLAY
< > : TAPE PLAY
[ ] : TAPE REC
* : Impossible to measure
•Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F : TUNER (FM/AM)
E : TAPE PLAY (DECK A)
d : TAPE PLAY (DECK B)
G : RECORD
J : CD PLAY
N : MIC INPUT
c : CDG
g : VIDEO
4
W or less unless otherwise
Note on Printed Wiring Boards:
Note:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
• Indication of transistor.
C
B
B
Q
B
E
Q
CE
Q
CE
These are omitted.
These are omitted.
These are omitted.
25
HCD-GNX780/GNX880
d
• CIRCUIT BOARDS LOCATION
PRIMARY board
CD-SW board
SWITCHING POWER
TRANS board
CDG board
PA board
TUNER PACK
EFFECTOR board
SURROUND board
MOTOR (LD) board
PANEL board
FUNCTION board
JOG board
SW board
SENSOR board
BD84 board
MOTOR (TB) board
DRIVER boar
26
MAIN board
MIC board
7-1. BLOCK DIAGRAM – CDG SECTION –
HCD-GNX780/GNX880
OPTICAL PICK-UP
BLOCK
(KSM-215DCP/C2NP)
DETECTOR
VCC
VC
A
B
C
D
E
F
LD
GND
PD
VR
FOCUS
COIL
TRACKING
COIL
M101
(SPINDLE)
M102
(SLED)
S101
(LIMIT)
81
AOUT1
86
AOUT2
XTCN
XRST
DATA
XLT
CLOCK
SENS
SCOR
IC1005
IC1002
CD MUTE
Q250,251
98
6
34
2
11 10
12
DRAM
DQ1-4
A0-7
RAS
CAS
WE
CE
1,2,24,25
9-12,14-17
IC101
RF AMP, DSP, DAC
71
DOUT
+3.3V
LD
DRIVER
Q10
X171
16.9MHz
IC251
SL/SP MOTOR
DRIVER
F+
12
CH2OUT-F
F
11
CH2OUT-R
T+
13
CH1OUT-R
T
14
CH1OUT-F
15
CH4OUT-R
M
16
CH4OUT-F
17
CH3OUT-F
M
CH3OUT-R
18
OUT
VREF
CH1FIN
CH1RIN
CH2FIN
CH2RIN
CH3FIN
CH3RIN
OPIN+
MUTE
26
4
5
6
7
23
22
2
20
100
VC
25
26
A
27
B
28
C
29
D
19
E
20
F
36
LD
XTAO
77
XTAI
78
37
PD
11
TFDR
12
TRDR
13
FFDR
14
FRDR
SFDR
9
SRDR
10
6
MPD
XRST
SSTP
7
PCMD1
LRCKI
LRCK
PCMD
BCK
BCK1
XTACN
XRST
DATA
XLAT
CLOCK
SENS
SCOR
GFS
C2PO
WFCK
SBSO
EXCK
100
102
104
105
107
115
113
114
110
61
62
63
65
66
60
95
NC
NC
5
1
13
CD MUTE DRIVE
Q540, 541
11
SDO0
16
LRCKIA
19
SFSY/LRCK1B
14
SDI0
15
BCKIA
18
SBSY/BCK1B
SBSY
4
SFSY
5
DATA
398
CLCK
299
VD0-3
25,27,29,30
VA0-7
15-22
144
RAS
CAS
2623
WE
133
CE
2822
60
X1002
14.31818MHz
IC301
MP3
DECODER
PO11/BUCK/AD1
IC1001
VIDEO D/A
XO159XI1
VDD
VDD
VDDM
STANBY
MIACK
MICK
MIDIO
MILP
MICS
RESET
SRMSTB
PDOWN
SENTSC
RESET
VDOUT
XO257XI2
58
X1001
17.734475MHz
MUTE
DEN
GDET
R-CH
IC303
MUTE DATA
HALT_CLK
CDG-RST
CDG-DET
+3.3V
MP3 STB
27
MP3 REQ
26
25
MP3 ACK
7
MP3 CLK
5
MP3 DATA OUT
24
MP3 LP
23
MP3 CS
22
MP3 RST
MP3 DATA IN
6
SCOR
19
21
SENS
CD-CLK
18
XLAT
3
CD-DATA
2
XRST
1
XTCN
28
CD MUTE
37
HALT_CLK
CDG-POWER
VMUTE
55
21
40
3
36
8
7
6
5
4
2
41
Q1005,1009
6
56
55
54
Q1001
52
37
44
PAL/_NTSC
5 1
REG
MP3 STB
MP3 REQ
MP3 ACK
MP3 CLK
MP3 DATA
MP3 LP
MP3 CS
MP3 RST
SCOR
SENS
CLOCK
XLT
DATA
XRST
XTCN
Q1004
Q1002,1006
EVER+3.3V
CD-L
MUTE DATA
VCC
IC401 (1/5)
CONTROL
CDG RST
35
CDG-RST
+B SWITCH
Q1007,1008
Q1010
A
IC210
OPTICAL
OUT
SYSTEM
CDG DET
33 31 32 9
VMUTE
CDG-DET
MAIN
SECTION
(Page 29)
VMUTE
CD POWER
CNVSS
CDG-POWER
1
VIDEO BUFFER
1
4
CD DIGITAL
OPTICAL
TM-R
TBL_SENS
OPEN SW
RESET
IIC-DATA
IIC-CLK
CNVSS
IC1003
+5V REG.
VIN
IC1006
PWR
VIN
OUT
LMR
LMF
TM-F
E-1
E-2
E-3
VOUT
VCC
SAVE
VOUT
IC701
TABLE LOADING
MOTOR DRIVER
OUT1
OUT2
OUT1
OUT2
E-3
E-2
E-1
4
2
4
2
ROTARY
ENCODER
S751
(OPEN)
NO402
3
4
CN402
2
3
6
7
8
9
RESET
IIC-DATA
IIC-CLK
IIC-CLK
IIC-DATA
TXD1
RTS1
CLK1
RXD1
CN VSS
RESET
M
(TABLE LOADING)
M
(TABLE)
IC731
TBL ADDRESS
SENS
ON BOARD
PROGRAM
M741
M+9V
B
M751
DISPLAY/POWER
SECTION
(Page 31)
46
45
44
43
39
42
41
40
38
12
30
29
3
6
2
3
J1001
VIDEO
OUT
RIN
9
FIN
7
IC712
TABLE MOTOR DRIVER
RIN
9
FIN
7
INVERTER
Q731
S711
VMUTE
CDG/_BGC
CDG/-DET
CDG/-POWER
CNVSS
• R-CH is omitted due to same as L-CH.
• SIGNAL PATH
: CD
: CDG
: VIDEO
HCD-GNX780/GNX880
2727
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