Sony HCDGX-25 Service manual
HCD-GX25
SERVICE MANUAL
Ver 1.0 2003. 03
• HCD-GX25 is the tuner, deck, CD
and amplifier section in MHCGX25.
CD
Section
Tape deck Model Name Using Similar Machanism NEW
Section Tape Transport Mechanism Type CWM43FF-05
US Model
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM74F-K6BD72
Optical Pick-up Name KSM-213DCP
Amplifier section
Continuous RMS power output (reference)
120+120 watts (6 ohms at
1 kHz, 10% THD)
Total harmonic distortion
less 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 1 Vp-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
– Continued on next page –
9-877-125-01
2003C0400-1
© 2003. 03
MINI HIFI COMPONENT SYSTEM
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
1
HCD-GX25
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.
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 for A C 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 a V OM
or battery-operated AC voltmeter . The “limit” indication is 0.75
V, so analog meters must have an accurate low-v oltage 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
Parts on Set
0.15µF
1.5k
Ω
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
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 P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
2
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 pickup 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
MODEL IDENTIFICATION
– BACK PANEL –
PARTS No.
MODEL PARTS No.
US models 4-244-697-01
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.
3
HCD-GX25
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
4
SECTION 1
GENERAL
HCD-GX25
This section is extracted
from instruction manual.
5
HCD-GX25
6
Note : Disassemble the unit in the order as shown below.
SET
2-1. CASE (TOP)
(Page 8)
2-2. CD DOOR
(Page 8)
2-3. FRONT PANEL SECTION
(Page 9)
HCD-GX25
SECTION 2
DISASSEMBLY
2-4. CD MECHANISM BLOCK
(Page 10)
2-6. PANEL BOARD,
2-8. BACK PANEL SECTION
(Page 12)
2-9. MAIN BOARD
(Page 12)
2-10. AMP BOARD
(Page 13)
1 STREAM LED BOARD,
REMOTE BOARD
(Page 11)
2-11. DRIVER BOARD,
SW BOARD
(Page 13)
2-12. CD BLOCK ASSY
2-5. TAPE MECHANISM DECK
(Page 10)
2-7. GAME JACK BOARD,
H/P JACK BOARD
(Page 11)
2-13. SENSOR BOARD
(Page 14)
2-14. MOTOR (TB) BOARD
(Page 15)
2-15. MOTOR (LD) BOARD
(Page 15)
(Page 14)
2-16. OPTICAL PICK-UP
(Page 16)
7
HCD-GX25
)
Note : Follow the disassembly procedure in the numerical order given.
2-1. CASE (TOP)
6
two screws (case 3 TP2)
7
screw (case 3 TP2)
9
(+BVTT 3
qf
case (side-L)
screw
case (top)
×
8)
qs
8
screw
(+BVTP 3
×
q;
10)
qd
qs
qa
two screws (+BVTP 3
case (side-R)
5
×
10)
3
screw
(+BVTP 3
1
two screws
(case 3 TP2)
×
10
2-2. CD DOOR
CD mechanism deck (CDM74F-K6BD72)
1
Turn the pulley to the direction of arrow.
pulley
Front panel side
2
Pull-out the disc tray.
3
4
CD door
4
screw
(+BVTT 3
2
screw (case 3 TP2)
×
8)
8
2-3. FRONT PANEL SECTION
9
screw
(+BVTP 3
×
10)
8
screw
(+BVTP 3
trans board
3
CN311
(flat type)
×
10)
1
HCD-GX25
CN605
qs
front panel section
2
CN304
(flat type)
0
(+BVTP 3
qa
three screws (+BVTP 3
4
screw
5
CN310
6
CN202
×
10)
× 6
7
CN305
CN203
)
9
HCD-GX25
)
)
)
2-4. CD MECHANISM BLOCK
4
CD mechanism block
3
three
(+BVTP 3
screws
2
CN312
(flat type
×
10
2-5. TAPE MECHANISM DECK
1
CN701
MAIN boardMAIN board
1
connector
2
six
screws
(+BVTP 2.6
×
8
10
3
tape mechanism deck
2-6. PANEL BOARD, 1 STREAM LED BOARD, REMOTE BOARD
)
d
5
four
(+BVTP 2.6
9
CN607
0
REMOTE board
screws
×
8)
7
two
screws
(+BVTP 2.6
4
two
(+BVTP 2.6
3
(+BVTP 2.6
2
three
(+BVTP 2.6
HCD-GX25
×
8)
screws
×
two
screws
screws
×
8)
8)
×
8
1
volume knob
2-7. GAME JACK BOARD, H/P JACK BOARD
6
PANEL board
8
1 STREAM LED board
1
two
screws
(+BVTP 2.6
×
8)
4
H/P JACK board
2
GAME JACK boar
3
screw
(+BVTP 2.6
×
8)
11
HCD-GX25
d
2-8. BACK PANEL SECTION
4
back panel section
1
CN101
(flat type)
2
(+BVTP 3
3
two
(+BVTT 3
two
screws
screws
×
×
10)
6)
2-9. MAIN BOARD
chassis section
MAIN board
2
MAIN boar
12
1
two
screws
(+BVTT 3
×
6)
2-10. AMP BOARD
)
d
1
CN902
4
(+BVTP 3
5
screw
(+BVTP 3
screw
×
10)
×
10)
3
screw
(+BVTP 3
×
10)
two claws
2
(+BVTP 3
6
AMP board
screw
HCD-GX25
×
10
2-11. DRIVER BOARD, SW BOARD
4
SW board
1
3
screw
(+BTTP (M2.6))
CN704
7
CN702 (flat type)
2
CN703
6
DRIVER boar
5
two
screws
(+BTTP (M2.6))
13
HCD-GX25
2-12. CD BLOCK ASSY
2
holder (213) assy
qh
CD block assy
0
two
insulators
9
two
coil springs
(insulator)
8
two stoppers (BU)
qa
3
floating
floating
insulators
two
coil springs
screw
screw
(+PTPWH M2.6)
1
(+PTPWH M2.6)
6
two
5
(insulator)
4
two floating
(+PTPWH M2.6)
screws
2-13. SENSOR BOARD
2
tray
qd
Remove the four solderings of motor.
1
floating
(+PTPWH M2.6)
6
floating
(+PTPWH M2.6)
screw
8
screw
(+BTTP (M2.6))
screw
7
two screws
(BVTT M2.6)
9
0
SENSOR board
CN731
qf
CN708 (flat type)
qg
qs
screw (+BTP 2.6x 8)
3
belt (table)
4
floating
(+PTPWH M2.6)
5
screw
pulley (table)
BD board
14
7
gear (geneva)
2-14. MOTOR (TB) BOARD
1
5
table motor assy (M741)
HCD-GX25
2-15. MOTOR (LD) BOARD
4
Remove the two solderings of motor.
5
loading motor assy (M751)
3
MOTOR (TB) board
4
Remove the two solderings of motor.
2
two
screws
(+BTTP (M2.6))
2
two
screws
(+BTTP (M2.6))
3
MOTOR (LD) board
1
belt (loading)
15
HCD-GX25
)
2-16. OPTICAL PICK-UP
3
sled shaft
5
optical pick-up
4
2
claw
1
gear (A
16
SECTION 3
DIAGRAMS
3-1. IC PIN DESCRIPTION
• IC601 LC876756C-51H7-E (SYSTEM CONTROL, FLD CONTROL) (PANEL BOARD)
Pin No. Pin Name I/O Pin Description
1 SYS MUTE O System mute signal output
2BU1924 DATA I Not used in this set. (Connected to ground.)
3 PWR DOWN I Power down signal input
4 LC78646 RESET O CD reset signal output to the IC721 (LC78646)
5 LC78646 CE O CD CE signal output to the IC721 (LC78646)
6 LC78646 CE (MP3) O CD CE (MP3) signal output (Not used in this set.)
7 M61519 CLK O Clock signal output to the IC301 (M61529FP)
8BU2099FV LCK O LCK signal output to the IC309 (BU2099FV)
9 LC72121 CE O CE signal output to the TU701 (tuner pack)
10 LC78684 SYNC I SYNC signal input
11 RESET I Reset signal input from the IC603
12 XT1 I Oscillater connect pin (32.768 kHz)
13 XT2 O Oscillater connect pin (32.768 kHz)
14 VSS1 — Ground pin
15 CF1 I Ceramic vibrator connect pin (8.64 MHz)
16 CF2 O Ceramic vibrator connect pin (8.64 MHz)
17 VDD — Power supply pin (+3.3 V)
18 TAPE A STAT I Tape A start signal input
19 TAPE B STAT I Tape B start signal input
20 CD ENCODER I CD encoder switch signal input
21 SW ON/OFF SENSOR I Switch control on/off signal input
22 STREAM IN I Stream in signal input
23 VACS I VACS signal input
24 KEY2 I Key signal input 2
25 KEY1 I Key signal input 1
26 KEY0 I Key signal input 0
27 PROTECTOR (HOLD) I Protector (Hold) signal input
28 REMOCON IN I Remote control signal input from the RM601
29 BU1924 CLK I Not used in this set. (Connected to ground.)
30 – 41 G12 – G1 O FLD control signal output
42 – 45 P1 – P4 O FLD control signal output
46 VDD3 — Power supply pin (+3.3 V)
47 – 50 P5 – P8 O FLD control signal output
51 VPP — Ground pin
52 – 55 P9 – P12 O FLD control signal output
56 SW1 (a) P13 O FLD control signal output
57 SW2 (b) P14 O FLD control signal output
58 SW3 (c) P15 O FLD control signal output
59 SW4 (d) P16 O FLD control signal output
60 SW5 P17 O FLD control signal output
61 SW6 P18 O FLD control signal output
62 SW7 P19 O FLD control signal output
63 SW8 P20 O FLD control signal output
64, 65 P21, P22 O FLD control signal output
66 ENTER LED O Not used in this set. (Open)
67 MD/VIDEO LED O Not used in this set. (Open)
68 GAME LED O GAME LED (LED612) drive signal output
69 TAPE LED O TAPE LED (LED609) drive signal output
70 TUNER LED O TUNER LED (LED608) drive signal output
71 CD LED O CD LED (LED607) drive signal output
72 VDD4 — Power supply pin (+3.3 V)
HCD-GX25
17
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