HCD-GX20, MHC-GX20 - Sony Audio Service Manual (repair manual)

Model
HCD-GX20 MHC-GX20
Pages
53
Size
4.53 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-gx20-mhc-gx20.pdf
Date

View Sony HCD-GX20 / MHC-GX20 Service Manual online

HCD-GX20
US Model
Canadian Model
SERVICE MANUAL
MINI HI-FI COMPONENT SYSTEM
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-873-622-05
2003L16-1
© 2003.12
• HCD-GX20 is the tuner, deck, CD and
amplifier section in MHC-GX20.
SPECIFICATIONS
Ver 1.4  2003.12
Model Name Using Similar Mechanism
HCD-DX10
CD
CD Mechanism Type
CDM58F-K6
Section
Optical Pick-up Name
KSM-213D
Tape deck
Model Name Using Similar Mechanism
NEW
Section
Tape Transport Mechanism Type
CWL43FF48
AUDIO POWER SPECIFICATIONS:
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
with 6 ohms loads both channels driven, from
120 – 10,000 Hz; rates 60 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.
Total harmonic distortion less than 0.07%
(6 ohms at 1 kHz, 30 W)
Amplifier section
Continuous RMS power output (reference)
60 + 60 watts (6 ohms at
1 kHz, 10% THD)
Total harmonic distortion less than 0.07%
(6 ohms at 1 kHz, 30 W)
Inputs
AUDIO INPUT (phono jack):
voltage 450 mV,
impedance 47 kilohms
Outputs
PHONES (stereo mini jack):
accepts headphones of
8 ohms or more
Front speaker:
accepts impedance of 6 to
16 ohms
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
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 ohms 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
120 V AC, 60 Hz
Power consumption
105 watts
Dimensions (w/h/d)
Approx. 280 
× 325 × 412 mm
Mass
Approx. 8.5 kg
Supplied accessories:       Remote Commander (1)
Batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Front speaker pads (8)
Design and specifications are subject to change
without notice.
2
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 
0
 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
       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)
SAFETY  CHECK-OUT
To Exposed Metal 
Parts on Set
0.15 
µ
F
1.5 k
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A.  Using an AC voltmeter to check AC leakage.
HCD-GX20
3
HCD-GX20
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
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.
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.
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 pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
TABLE OF CONTENTS
1. GENERAL
·········································································· 4
2. DISASSEMBLY
································································ 6
2-1. Case (Top) ····································································· 6
2-2. CD Door ········································································ 7
2-3. Front Panel Section ······················································· 7
2-4. CD Mechanism Deck (CDM58F-K6) ·························· 8
2-5. Tape Mechanism Deck (CWL43FF48) ························· 8
2-6. REM Board and PANEL Board ···································· 9
2-7. KEY Board ··································································· 9
2-8. Back Panel Section ····················································· 10
2-9. SUB TRANS Board and VIDEO OUT Board ············ 10
2-10. MAIN Board ······························································· 11
2-11. POWER Board ···························································· 11
2-12. TRANS Board ···························································· 12
2-13. CD Board and DRIVER Board ··································· 12
2-14. SPDL Board ································································ 13
2-15. Optical Pick-up (KSM-213D) ····································· 13
2-16. MOTOR Board, ADDRESS SENSOR Board ············ 14
2-17. Table (New), Cam (Control) and DC Motor ··············· 14
3. TEST MODE
···································································· 15
4. ELECTRICAL ADJUSTMENTS
······························· 17
5. DIAGRAMS
······································································ 19
5-1. Circuit Boards Location ·············································· 19
5-2. Block Diagrams ·························································· 20
5-3. Printed Wiring Boards – CD Section (1/2) – ·············· 22
5-4. Printed Wiring Boards – CD Section (2/2) – ·············· 23
5-5. Schematic Diagram – CD Section – ··························· 24
5-6. Printed Wiring Board – MAIN Section – ··················· 25
5-7. Schematic Diagram – MAIN Section (1/4) – ············· 26
5-8. Schematic Diagram – MAIN Section (2/4) – ············· 27
5-9. Schematic Diagram – MAIN Section (3/4) – ············· 28
5-10. Schematic Diagram – MAIN Section (4/4) – ············· 29
5-11. Printed Wiring Boards – PANEL Section – ················ 30
5-12. Schematic Diagram – PANEL Section – ···················· 31
5-13. Printed Wiring Boards – POWER/TRANS Section – 32
5-14. Schematic Diagram – POWER/TRANS Section – ····· 33
5-15. IC Pin Function Description ······································· 36
6. EXPLODED VIEWS
······················································ 38
6-1. Main Section ······························································· 38
6-2. Front Panel Section ····················································· 39
6-3. MAIN Board Section ·················································· 40
6-4. CD Mechanism Deck Section (CDM58F-K6) ··········· 41
7. ELECTRICAL PARTS LIST
······································· 42
Ver 1.3  2003.11
4
HCD-GX20
This section is extracted
from instruction manual.
SECTION 1
GENERAL
BUTTON DESCRIPTIONS
?/1 (power) 1
Z OPEN/CLOSE qs
Z (deck B) qg
M qk
. qk
> qk
X qk
N qk
x qk
m qk
Z (deck A) wa
Main unit
ALPHABETICAL ORDER
A – E
AUDIO jacks ws (24)
CD wj (11, 12, 18)
CD SYNC 7 (18)
Deck A w; (16, 17)
Deck B qh (16 – 19)
DISC 1 – 3 0 (11, 12)
DISC SKIP/EX-CHANGE qa (10,
11)
Disc tray 9 (10)
DISPLAY 2 (16, 21)
EFFECT ON/OFF qj (20)
G – Z
GAME wf (22, 24)
GAME EQ ql (20, 24)
GAME MIXING 4 (22)
GROOVE 6 (20)
MOVIE EQ 5 (20)
MUSIC EQ 9 (20)
PHONES jack qf
REC PAUSE/START 8 (18)
TAPE A/B wg (16, 18)
TUNER/BAND wh (13 – 15, 18)
VIDEO jack wd (24)
VOLUME control qd
1
2
3
5
4
9
0
6 7 8
qd
qf
qg
qh
qa
qs
qj
qk
ql
w;
wa
wd
ws
wf
wg
wh
wj

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Here you can view online and download Sony HCD-GX20 / MHC-GX20 Service Manual in PDF. HCD-GX20 / MHC-GX20 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony HCD-GX20 / MHC-GX20 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.