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SERVICE MANUAL
9-873-800-13
Sony Corporation
2002E0500-1
Home Audio Company
C
2002.05
Published by Sony Engineering Corporation
Ver 1.2 2002.05
MINI Hi-Fi COMPONENT SYSTEM
MHC-MG110/MG310AV
US Model
Canadian Model
MHC-MG110/MG310AV
Mexican Model
MHC-MG110
Australian Model
MHC-MG310AV
· MHC-MG110/MG310AV are composed of following models.
As for the service manual, it is issued for each component model, then, please refer to it.
SPECIFICATIONS
Power requirements
North American model:
120 V AC,60 Hz
Australian model:
220 ­ 240 V AC,
50/60 Hz
Power consumption
North American model
MHC-MG310AV:
200 watts
MHC-MG110:
150 watts
Australian model
MHC-MG310AV:
200 watts
Dimensions (w/h/d) incl. projecting parts and controls
Approx. 280
× 383 × 480 mm
Mass
MHC-MG310AV:
Approx. 11.3 kg
MHC-MG110:
Approx. 10.9 kg
Supplied accessories:
Remote commander (1)
Batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Rear speaker cords
(MHC-MG310AV only) (2)
Center speaker pads
(attached to the backside of the center
speaker)
(MHC-MG310AV only) (2)
Video cable (Australian model only) (1)
Design and specifications are subject to change without notice.
PARTS LIST
COMPONENT MODEL NAME
MHC-MG110
MHC-MG310AV
COMPACT DISC DECK RECEIVER SYSTEM
HCD-MG110
HCD-MG310AV
FRONT SPEAKER
SS-MG110
SS-MG510AV
CENTER SPEAKER
SS-CT360
REAR SPEAKER
SS-RS360
1-476-631-11 REMOTE COMMANDER (RM-SMG5AV) (MG310AV)
1-476-632-11 REMOTE COMMANDER (RM-SMG1) (MG110)
1-501-659-71 ANTENNA (FM) (MG110/MG310AV: US, Canadian)
1-754-060-11 ANTENNA (FM) (Australian)
1-754-102-21 ANTENNA, LOOP (LW.MW)
1-769-433-11 CORD, SPEAKER (10m) (for SS-RS360)
1-823-258-11 CORD, CONNECTION (VIDEO CABLE) (Australian)
4-228-953-01 COVER, BATTERY (for RM-SMG1/SMG5AV)
4-233-902-12 MANUAL, INSTRUCTION (ENGLISH)
4-233-902-22 MANUAL, INSTRUCTION (FRENCH) (Canadian)
4-233-902-31 MANUAL, INSTRUCTION (SPANISH) (Mexican)
Part No.
Description
Remark


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MHC-MG110/MG310AV
REVISION HISTORY
Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.
Ver.
Date
Description of Revision
1.0
2001.03
New
1.1
2001.05
Addition of Canadian model (MHC-MG110/MG310AV) and Australian
model (MHC-MG310AV)
1.2
2002.05
Addition of Mexican model (MHC-MG110)
(ENG-02011)


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SERVICE MANUAL
HC D-MG310AV only
This stereo system is equipped with the Dolby* Pro Logic
Surround decoder.
* Manufactured under license from Dolby Laboratories.
Dolby, Pro Logic, and the double-D symbol
; are
trademarks of Dolby Laboratories. Confidential
unpublished works. '1992-1997 Dolby Laboratories.
All rights reserved.
Amplifier section
U.S.A. models:
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
with 8 ohm loads both channels driven, from
120 ­ 10,000 Hz; rated 75 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.
HCD-MG310AV
Front speaker:
Continuous RMS power output
75 + 75 watts
(8 ohms at 1 kHz,
10% THD)
Total harmonic distortion less than 0.09%
(8 ohms at 1 kHz,
40 watts)
Center speaker:
Continuous RMS power output
25 watts
(8 ohms at 1 kHz,
10% THD)
Rear speaker:
Continuous RMS power output
25 + 25 watts
(8 ohms at 1 kHz,
10% THD)
HCD-MG110
Continuous RMS power output
75 + 75 watts
(8 ohms at 1 kHz,
10% THD)
Total harmonic distortion less than 0.09%
(8 ohms at 1 kHz,
40 watts)
Inputs
VIDEO/MD IN (phono jacks):
voltage 250 mV/450 mV,
impedance 47 kilohms
5.1CH (HCD-MG310AV only):
FRONT (phono jacks):
voltage 450 mV,
impedance 47 kilohms
REAR (phono jacks):
voltage 450 mV,
impedance 47 kilohms
CENTER (phono jack):
voltage 450 mV,
impedance 47 kilohms
SUB WOOFER (phono jack):
voltage 450 mV,
impedance 47 kilohms
Outputs
PHONES (stereo phone jack):
accepts headphones of
8 ohms or more
FRONT SPEAKER:
accepts impedance of 8 to
16 ohms (except for the
North American model)
SURROUND SPEAKER REAR
(HCD-MG310AV only):
accepts impedance of 8 to
16 ohms (except for the
North American model)
SURROUND SPEAKER CENTER
(HCD-MG310AV only):
accepts impedance of
8 ohms (except for the
North American model)
SUB WOOFER (HCD-MG310AV only):
voltage 1 V,
impedance 1 kilohm
CD player section
System
Compact disc and digital
audio system
Laser
Semiconductor laser
(
= 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
OPTICAL OUT (CD)
(Square optical connector jack, rear panel)
Wavelength
660 nm
Output Level
­18 dBm
US Model
Canadian Model
HCD-MG110/MG310AV
Australian Model
HCD-MG310AV
HCD-MG110/MG310AV
Ver 1.1 2001.06
9-873-801-12
Sony Corporation
2001F0500-1
Home Audio Company
C
2001.6
Shinagawa Tec Service Manual Production Group
COMPACT DISC DECK RECEIVER
SPECIFICATIONS
HCD-MG110/MG310AV are the Amplifier, CD player, Tape
Deck and Tuner section in MHC-MG110/MG310AV.
­ Continued on next page ­
Model Name Using Similar Mechanism
NEW
CD
CD Mechanism Type
CDM64-K1BD44A
Section
Base Unit Name
BU-K1BD44A
Optical Pick-up Name
KSM-213BFN
TAPE
Model Name Using Similar Mechanism
NEW
Section
Tape Transport Mechanism Type
CM8L6Z511A
Photo: HCD-MG110


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2
HCD-MG110/MG310AV
TABLE OF CONTENTS
Tape player section
Recording system
4-track 2-channel stereo
Frequency response
40 ­ 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
North American model:
75 ohms unbalanced
Australian model:
75 ohms balanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
North American model:
530 ­ 1,710 kHz
(with the interval set at
10 kHz)
531 ­ 1,710 kHz
(with the interval set at
9 kHz)
Australian model:
531 ­ 1,602 kHz
(with the interval set at
9 kHz)
Antenna
AM loop antenna
Antenna terminals
External antenna terminal
Intermediate frequency
450 kHz
General
Power requirements
North American model:
120 V AC, 60 Hz
Australian model:
220 ­ 240 V AC,
50/60 Hz
Power consumption
North American model
HCD-MG310AV:
200 watts
HCD-MG110:
150 watts
Australian model
HCD-MG310AV:
200 watts
Dimensions (w/h/d) incl. projecting parts and controls
Approx. 280
× 383 × 480
mm
Mass
HCD-MG310AV:
Approx. 11.3 kg
HCD-MG110:
Approx. 10.9 kg
Design and specifications are subject to change
without notice.
1.
SERVICING NOTE .................................................. 4
2.
GENERAL ................................................................... 5
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
7
3-2. Upper Cover ....................................................................
8
3-3. Front Block Assy .............................................................
8
3-4. MAIN Board ...................................................................
9
3-5. Back Panel, DC Fan (M391) (Australian model) ...........
9
3-6. MAIN AMP Board, POWER Board ............................... 10
3-7. Middle (F) Assy, Bracket (Middle-R),
Power Bracket ................................................................. 10
3-8. Mechanism Deck (CDM64-K1BD44A) ......................... 11
3-9. Base Unit (BU-K1BD44A) ............................................. 11
3-10. BU Holder Assy .............................................................. 12
3-11. Motor Gear Assy (Sled) (M102), CD Board .................. 12
3-12. Op Base Assy (KSM-213BFN) ...................................... 13
3-13. Cassette Lid Assy (A)/(B) ............................................... 13
3-14. Mech Deck (TAPE) ......................................................... 14
4.
TEST MODE .............................................................. 15
5.
MECHANICAL ADJUSTMENTS ....................... 16
6.
ELECTRICAL ADJUSTMENTS
Deck Section ............................................................................. 16
CD Section ................................................................................ 18
7.
DIAGRAMS
7-1. Block Diagram ­ CD SERVO Section ­ ........................ 21
7-2. Block Diagram ­ TUNER/TAPE DECK Section ­ ...... 22
7-3. Block Diagram ­ SURROUND Section ­ ...................... 23
7-4. Block Diagram ­ AMP Section ­ ................................... 24
7-5. Block Diagram
­ DISPLAY/POWER SUPPLY Section ­ ...................... 25
7-6. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 26
7-7. Schematic Diagram ­ CD Section ­ ............................... 28
7-8. Printed Wiring Board ­ CD Section ­ ............................ 29
7-9. Printed Wiring Boards
­ CD MOTOR/SENSOR Section ­ ................................ 30
7-10. Schematic Diagram
­ CD MOTOR/SENSOR Section ­ ................................ 31
7-11. Printed Wiring Board ­ TC Section ­ ............................. 32
7-12. Schematic Diagram ­ TC Section ­ ............................... 33
7-13. Schematic Diagram ­ MAIN Section (1/4) ­ ................. 34
7-14. Schematic Diagram ­ MAIN Section (2/4) ­ ................. 35
7-15. Schematic Diagram ­ MAIN Section (3/4) ­ ................. 36
7-16. Schematic Diagram ­ MAIN Section (4/4) ­ ................. 37
7-17. Printed Wiring Board ­ MAIN Section ­ ....................... 38
7-18. Printed Wiring Boards ­ AMP Section ­ ........................ 40
7-19. Schematic Diagram ­ AMP Section ­ ............................ 41
7-20. Printed Wiring Boards ­ DISPLAY Section ­ ............... 42
7-21. Schematic Diagram ­ DISPLAY Section ­ .................... 43
7-22. Printed Wiring Board ­ CONTROL Section ­ ............... 44
7-23. Schematic Diagram ­ CONTROL Section ­ .................. 45
7-24. Printed Wiring Boards ­ POWER Section ­ .................. 46
7-25. Schematic Diagram ­ POWER Section ­ ...................... 47
7-26. IC Pin Function Description ........................................... 48
8.
EXPLODED VIEWS
8-1. General Section ............................................................... 54
8-2. Front Panel Section ......................................................... 55
8-3. Chassis Section ............................................................... 56
8-4. Mechanism Deck Section (CDM64-K1BD44A) ........... 57
8-5. Base Unit Section (BU-K1BD44A) ............................... 58
9.
ELECTRICAL PARTS LIST ............................... 59
Ver 1.1 2001.05


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3
HCD-MG110/MG310AV
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15
µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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 AC 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
VOM or battery-operated AC voltmeter. The "limit" indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are
suitable. (See Fig. A)
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
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.
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 PUB-
LISHED BY SONY.
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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
Ver 1.1 2001.05
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.