Sony HCD-GN800 User manual

SERVICE MANUAL
Model Name Using Similar Mechanism NEW
CD CD Mechanism Type CDM74-K6BD47S
Section Base Unit Name BU-K6BD47S
Optical Pick-up Name KSM-213DCP
TAPE Model Name Using Similar Mechanism HCD-XGR88
Section Tape Transport Mechanism Type CWM43RR23
MiNi Hi-Fi COMPONENT SYSTEM
E Model
HCD-GN800
Ver 1.0 2003.04
9-877-275-01 Sony Corporation
2003D0200-1 Home Audio Company
C2003.04 Published by Sony Engineering Corporation
SPECIFICATIONS
HCD-GN800 is the amplifier, CD player,
tape deck and tuner section in MHC-
GN800.
– Continued on next page –
Amplifier section
The following are measured at AC 127V, 60 Hz
(Mexican model only)
The following are measured at AC 120, 220, 240V
50/60 Hz (except Mexican model)
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)
Inputs
GAME (VIDEO): 1 Vp-p, 75 ohms
(phono jack)
GAME (AUDIO): Voltage 250 mV,
(phono jacks) impedance 47 kilohms
MD/VIDEO (AUDIO) IN: voltage 450 mV/250 mV,
(phono jacks) impedance 47 kilohms
MIC: sensitivity 1 mV,
(phone jack) impedance 10 kilohms
Outputs
VIDEO OUT: max. output level 1 Vp-p,
(phono jacks) unbalanced, Sync.
negative load impedance 75 ohms
PHONES: accepts headphones of
(stereo mini jack) 8 ohms or more
FRONT SPEAKER: accepts impedance of 6 to 16 ohms
SURROUND SPEAKER: accepts impedance of 24 ohms or more
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser
(λ=795nm)
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 795 nm
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wave length 660 nm
Output Level –18 dBm
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB), using Sony
TYPE I cassette

HCD-GN800
2
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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 ra-
diation exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH 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 PUB-
LISHED BY SONY.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
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
Latin Americanmodels: 530 –1,710 kHz
(with the interval set at 10 kHz)
531 –1,710 kHz
(with the interval set at 9 kHz)
Middle Eastern models: 531 –1,602 kHz
(with the interval set at 9 kHz)
Other models: 531 –1,602 kHz
(with the interval set at 9 kHz)
530 –1,710 kHz
(with the interval set at 10 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
Mexican models: 120V or 127V AC, 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 250 watts
Dimensions (w/h/d) Approx. 280 x 360 x 386.5 mm
Mass : Approx. 13.6 kg
Design and specifications are subject to change without notice.

HCD-GN800
3
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL
Location of Controls ....................................................... 5
3. DISASSEMBLY
3-1. Case ................................................................................. 8
3-2. Loading (Panel)............................................................... 8
3-3. Front Panel Assy ............................................................. 9
3-4. Tuner Pack, Sub Trans Board ......................................... 9
3-5. CD Mechanism Deck ...................................................... 10
3-6. Game In Board, Tape Mechanism Deck......................... 10
3-7. CD Switch Board, Display Board .................................. 11
3-8. Volume Board.................................................................. 11
3-9. Subwoofer Board, Rear Panel ........................................ 12
3-10. Main Board...................................................................... 12
3-11. Power Amp Board ........................................................... 13
3-12. SW Board, Driver Board................................................. 13
3-13. CD Board, CD Block Assy ............................................. 14
3-14. Sensor Board ................................................................... 14
3-15. Motor (TB) Board ........................................................... 15
3-16. Motor (LD) Board ........................................................... 15
4. TEST MODE.............................................................. 16
5. MECHANICAL ADJUSTMENTS....................... 20
6. ELECTRICAL ADJUSTMENTS
Deck section .................................................................... 20
CD Section ...................................................................... 22
7. DIAGRAMS
7-1. Circuit Board Location ................................................... 26
7-2. Block Diagram –CD Servo Section –........................... 28
Block Diagram –Tuner/Tape Deck Section –............... 29
Block Diagram –Main/Power Section –....................... 30
Block Diagram –Display Section –.............................. 31
7-3. Printed Wiring Board –CD Board –............................. 32
7-4. Schematic Diagram –CD Board –................................ 33
7-5. Printed Wiring Board –CD Mechanism Board –......... 34
7-6. Schematic Diagram –CD Mechanism Board –............ 35
7-7. Printed Wiring Boards –Main Board –......................... 36
7-8. Schematic Diagram –Main Board (1/3) –.................... 37
7-9. Schematic Diagram –Main Board (2/3) –.................... 38
7-10. Schematic Diagram –Main Board (3/3) –.................... 39
7-11. Printed Wiring Boards
–Game In, CD Switch Board –...................................... 40
7-12. Schematic Diagram
–Game In, CD Switch Board –...................................... 41
7-13. Printed Wiring Board –Display Board –...................... 42
7-14. Schematic Diagram –Display Board –......................... 43
7-15. Printed Wiring Board –Power Amp Board –................ 44
7-16. Schematic Diagram –Power Amp Board –.................. 45
7-17. Printed Wiring Board –Subwoofer Board –................. 46
7-18. Schematic Diagram –Subwoofer Board –.................... 47
7-19. Printed Wiring Boards –Trans Board –........................ 48
7-20. Schematic Diagram –Trans Board –............................. 49
7-21. IC Block Diagram ........................................................... 50
7-22. IC Pin Function Description ........................................... 51
8. EXPLODED VIEWS
8-1. Case, Rear Panel Section ................................................ 56
8-2. Front Panel Section ......................................................... 57
8-3. Chassis Section ............................................................... 58
8-4. CD Mechanism Deck Section-1
(CDM74-K6BD47S) ....................................................... 59
8-5. CD Mechanism Deck Section-2
(CDM74-K6BD47S) ....................................................... 60
9. ELECTRICAL PARTS LIST ............................... 61

4
HCD-GN800
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 electro-
static 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 emis-
sion, 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 waveforms is output three times.
•MODEL IDENTIFICATION
– Back Panel –
MODEL PART No.
E2, E3models 4-244-107-0[]
E51 model 4-244-107-1[]
Mexican model 4-244-107-2[]
Argentina model 4-244-107-3[]
•Abbreviation
E2 : 120 V AC Area in E model
E3 : 240 V AC Area in E model
E51 : Chilean and Peruvian model
PA R T No.

5
HCD-GN800
SECTION 2
GENERAL
ALBUM+/- qg
AMP MENU rd
CD r;
CD SYNC qj
DECK A wk
DECK B wd
DIRECTION 9
DISC 1~3 3
DISC SKIPEX-CHANGE4
Disc tray 6
DISPLAYra
Display 2
EDIT9
EFFECT ON/OFFrf
FM MODE 8
GAME eh
GAME EQ ea
GAME INPUT (jacks)wj
GAME MIXING ef
GROOVEed
IR (receptor) rs
ILLUMINATION wl
MD (VIDEO) ej
MIC(jack) wh
MICLEVELwg
MOVIE EQ qh
MUSIC EQ eg
OPEN/CLOSE Z5
P FILEwa
PHONES (jack) wf
PLAY MODE 7
Power illuminatore;
PUSH ENTERq;
REC PAUSE/START qk
REPEAT 8
SURROUND SPEAKER MODE w;
TAPE A/B ek
TUNER/BAND el
TUNER MEMORY 7
VOLUME ws
SYMBOLS
@/1 (power) 1
hH (play) qa
x(stop) qs
X(pause) qd
-.(go backward)qf
> + (go forward) qf
m(rewind) qg
M(fast forward)qg
V/v/B/bq;
AA (Eject A)es
AB (Eject B)ql
ALPHABETICAL ORDER
A - D
M - Q
wk
e k
wl
e l
e;
ea
es
eg
ed
ef
ej
eh
r
d
r;
r
a
r s
rf
wfwgwh wj
qs
qd
qf
qg
qh
qj
q
l
qk
w;
wa
ws
wd
0
qa
4 5 612 3
7
8
9
Mainunit
E - L
R - Z
This section is extracted from
instruction manual.

6
HCD-GN800
RemoteControl
4
5
qk
ql
w;
wa
ws
123
wg
wf
wd
qh
qj
qa
qs
qd
qf
7
q;
qg
8
9
6
CD ql
CLEAR 7
CLOCK/TIMER SELECT 2
CLOCK/TIMER SET 3
D.SKIP 9
ENTER qd
EFFECT ON/OFFqf
GAME w;
MD (VIDEO) q;
PRESET - wd
PRESET + wf
PRESET EQ qj
P FILE qh
SURROUND SPEAKER MODE qs
SLEEP 1
TAPE A/B qa
TUNER/BAND qk
TUNING - wa
TUNING + ws
VOL +/- 8
SYMBOLS
@/1 (power) 4
nN (play) wg
X(pause) 5
x(stop) 6
.(go backward)wd
>(go forward) wf
m(rewind) wa
M(fast forward)ws
M/m/</,qg
A - M
P - Z
ALPHABETICAL ORDER
This section is extracted from
instruction manual.

7
HCD-GN800
• This set can be disassembled in the order shown below.
SECTION 3
DISASSEMBLY
CASE
LOADING (PANEL)
SET
FRONT PANEL ASSY
CD SWITCH BOARD,
DISPLAY BOARD
CD BOARD,
CD BLOCK ASSY
OPTICAL PICK-UP
(KSS-213DCP)
VOLUME BOARD
SW BOARD,
DRIVER BOARD MOTOR (TB) BOARD
CD MECHANISM DECK GAME IN BOARD,
TAPE MECHANISM DECK
TUNER PACK,
SUB TRANS BOARD
MOTOR (LD) BOARD
SENSOR BOARD
SUBWOOFER BOARD
REAR PANEL
MAIN BOARD
POWER AMP BOARD

8
HCD-GN800
Note: Follow the disassembly procedure in the numerical order given.
3-1. CASE
3-2. LOADING (PANEL)
1 Three screws
(case 3 TP2)
2 Five screws
(+BVTT3 x 6)
6 Case
5
4
1
Three screws
(case 3 TP2)
3 Two screws
(+BVTT3 x 6
)
CD mechanismdeck (CDM74-K6BD47S)
1 Turn the pulley to the arrow direction.
Front side
Pulley
4 Loading (panel)
3
2
Pull out disc tray

9
HCD-GN800
3-3. FRONT PANEL ASSY
3-4.TUNER PACK, SUB TRANS BOARD
3 Screw (BVTP3 x 10)
2 Four screws (BVTP3 x 10)
8 Front panel ASSY
5 From CN606 on Game in board
4 From deck B head
CN402
CN304
6 From deck A head
7 From CN607 on
Game in board
1 Two wires
(flat type)
3 Screw (BVTP3 x 10)
MAIN boar
d
8 Sub trans board
4 CN971
5 CN974
6 CN976
1 Wire (flat type)
(11 core)
3 Tuner pack
2 Two screw (BVTP3 x 10)
7 Three screws
(BVTP3 x 10)

10
HCD-GN800
3-5. CD MECHANISM DECK
3-6. GAME IN BOARD,TAPE MECHANISM DECK
4 CD mechanism deck
2 Wire (flat type) (31 core)
1 Two screws (BVTP3 x 10
)
3 CN701
MAIN board
CN201
8 Tape mechanism deck
7 Three screws
(+BVTP2.6 x 8)
Shield plate (GHX)
2 Screw (+PTT2 x 4)
2 Screw (+PTT2 x 4)
4 Two screws (+BVTP2.6 x 8)
3 Two screws
(+BVTP2.6 x 8
)
5 Two screws
(+BVTP2.6 x 8)
6 GAME IN board
1 Knob (MIC)