Sony HCD-GX25 - System Components User manual
1
Ver 1.0 2003. 03
Model Name Using Similar Mechanism NEW
CD CD Mechanism Type CDM74F-K6BD72
Section Optical Pick-up Name KSM-213DCP
Tape deck Model Name Using Similar Machanism NEW
Section Tape Transport Mechanism Type CWM43FF-05
SERVICE MANUAL
US Model
HCD-GX25
Amplifier section
Continuous RMS power output (reference)
120+120 watts (6 ohms at
1 kHz, 10% THD)
Total harmonic distortionless than 0.07%
(6 ohms at 1 kHz, 60W)
Inputs
GAME INPUT AUDIO L/R (phono jacks):
voltage 250 mV,
impedance 47 kilohms
GAME INPUT VIDEO (phono jack):
1 Vp-p, 75 ohms
Outputs
PHONES (stereo mini jack):
accepts headphones of
8 ohms or more
VIDEO OUT (phono jack):
max. output level 1Vp-p,
unbalanced, Sync negative,
load impedance 75 ohms
SPEAKER: accepts impedance of 6 to
16 ohms
SPECIFICATIONS
CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
Tape deck section
Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassette
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-877-125-01
2003C0400-1
© 2003. 03
– Continued on next page –
MINI HIFI COMPONENT SYSTEM
•HCD-GX25isthetuner, deck, CD
and amplifier section in MHC-
GX25.
2
HCD-GX25
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 PUBLISHED BY SONY.
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 tuning
interval set at 10 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements 120 V AC, 60 Hz
Power consumption 120 watts
Dimensions (w/h/d) Approx. 280 ×325 ×407 mm
Mass Approx. 8.5 kg
Supplied accessories: AM loop antenna (1)
Remote Commander (1)
Batteries (2)
FM lead antenna (1)
Speaker pads (8)
Design and specifications are subject to change without
notice.
To Exposed Metal
Parts on Set
0.15µF 1.5k
Ω
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE TEST
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 aVOM
or battery-operatedAC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale. The
Simpson 250 and Sanwa SH-63Trd are examples of a passive
VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig.A)
3
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
HCD-GX25
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
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.
MODEL IDENTIFICATION
– BACK PANEL –
PARTS No.
MODEL PARTS No.
US models 4-244-697-01
4
TABLE OF CONTENTS
1. GENERAL
Main Unit ................................................................................ 5
Remote Control ....................................................................... 6
2. DISASSEMBLY
2-1. Case (Top) ........................................................................... 8
2-2. CD Door .............................................................................. 8
2-3. Front Panel Section ............................................................. 9
2-4. CD Mechanism Block .......................................................10
2-5. Tape Mechanism Deck ...................................................... 10
2-6. Panel Board, 1 Stream Led Board, Remote Board............ 11
2-7. Game Jack Board, H/P Jack Board ................................... 11
2-8. Back Panel Section............................................................ 12
2-9. Main Board ....................................................................... 12
2-10. Amp Board ........................................................................ 13
2-11. Driver Board, Sw Board.................................................... 13
2-12. CD Block Assy .................................................................. 14
2-13. Sensor Board ..................................................................... 14
2-14. Motor (TB) Board ............................................................. 15
2-15. Motor (LD) Board .............................................................15
2-16. Optical Pick-up ................................................................. 16
3. DIAGRAMS
3-1. IC Pin Description............................................................. 17
3-2. Circuit Boards Location .................................................... 19
3-3. Printed Wiring Boards –CD Mechanism Section (1/2)– ... 21
3-4. Printed Wiring Boards –CD Mechanism Section (2/2)– ... 22
3-5. Schematic Diagram –CD Mechanism Section– ................ 23
3-6. Printed Wiring Boards –Main Section– ............................ 24
3-7. Schematic Diagram –Main Section (1/3)– ........................ 25
3-8. Schematic Diagrams –Main Section (2/3)– ...................... 26
3-9. Schematic Diagram –Main Section (3/3)– ........................ 27
3-10. Printed Wiring Boards –Panel Section– ............................28
3-11. Schematic Diagram –Panel Section– ................................ 29
3-12. Printed Wiring Board –Power Amp Section– ................... 30
3-13. Schematic Diagram –Power Amp Section (1/2)– ............. 31
3-14. Schematic Diagram –Power Amp Section (2/2)– ............. 32
3-15. Printed Wiring Board –Transformer Section– .................. 33
3-16. Schematic Diagram –Transformer Section– ..................... 34
3-17. IC Block Diagrams............................................................ 35
4. EXPLODED VIEWS
4-1. Main Section ..................................................................... 37
4-2. Front Panel Section ........................................................... 38
4-3. Main Board Section .......................................................... 39
4-4. CD Mechanism Deck Section (1) ..................................... 40
4-5. CD Mechanism Deck Section (2) ..................................... 41
4-6. Optical Pick-up Section..................................................... 42
5. ELECTRICAL PARTS LIST ........................................ 43
HCD-GX25
5
HCD-GX25
SECTION 1
GENERAL This section is extracted
from instruction manual.
6
HCD-GX25
7
HCD-GX25
SECTION 2
DISASSEMBLY
Note : Disassemble the unit in the order as shown below.
2-1. CASE (TOP)
(Page 8)
2-2. CD DOOR
(Page 8)
SET
2-3. FRONT PANEL SECTION
(Page 9)
2-7. GAME JACK BOARD,
H/P JACK BOARD
(Page 11)
2-12. CD BLOCK ASSY
(Page 14)
2-16. OPTICAL PICK-UP
(Page 16)
2-11. DRIVER BOARD,
SW BOARD
(Page 13)
2-14. MOTOR (TB) BOARD
(Page 15)
2-4. CD MECHANISM BLOCK
(Page 10) 2-5. TAPE MECHANISM DECK
(Page 10)
2-6. PANEL BOARD,
1 STREAM LED BOARD,
REMOTE BOARD
(Page 11)
2-15. MOTOR (LD) BOARD
(Page 15)
2-13. SENSOR BOARD
(Page 14)
2-8. BACK PANEL SECTION
(Page 12)
2-9. MAIN BOARD
(Page 12)
2-10. AMP BOARD
(Page 13)
8
HCD-GX25
2-2. CD DOOR
Note : Follow the disassembly procedure in the numerical order given.
2-1. CASE (TOP)
case (side-R)
case (side-L)
5
qd
qs
qs
q;
6
two screws (case 3 TP2)
qf
case (top)
8
screw
(+BVTP 3
×
10)
3
screw
(+BVTP 3
×
10
)
9
screw
(+BVTT 3
×
8)
4
screw
(+BVTT 3
×
8)
1
two screws
(case 3 TP2)
qa
two screws (+BVTP 3
×
10)
7
screw (case 3 TP2)
2
screw (case 3 TP2)
2
Pull-out the disc tray.
4
CD door
1
Turn the pulley to the direction of arrow.
pulley
Front panel side
CD mechanism deck (CDM74F-K6BD72)
3
9
HCD-GX25
2-3. FRONT PANEL SECTION
1
CN605
2
CN304
(flat type)
4
CN310
5
CN202
6
CN203
7
CN305
3
CN311
(flat type)
trans board
qa
three screws (+BVTP 3
×
6
)
qs
front panel section
0
screw
(+BVTP 3
×
10)
8
screw
(+BVTP 3
×
10)
9
screw
(+BVTP 3
×
10)
10
HCD-GX25
2-5. TAPE MECHANISM DECK
2-4. CD MECHANISM BLOCK
1
CN701
MAIN boardMAIN board
2
CN312
(flat type
)
3
three
screws
(+BVTP 3
×
10
)
4
CD mechanism block
2
six
screws
(+BVTP 2.6
×
8
)
3
tape mechanism deck
1
connector
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