DAEWOO XG 318 Service Manual

SAFETY PRECAUTIONS ..................................................................................... 2~3

ADJUSTMENTS .................................................................................................... 4~5

EXPLODED VIEW AND PARTS LIST ......................................................... 6~7

WIRING DIAGRAM ................................................................................. 8

BLOCK DIAGRAM ............................................................................. 9

SCHEMATIC DIAGRAM ............................................................... 10~15

"

AMP ................................................................................................................... 10

"

TUNER .............................................................................................................. 11

"

TAPE ................................................................................................................. 12

"

MP3 CD ............................................................................................................. 13

"

FRONT .............................................................................................................. 14

"

POWER ............................................................................................................. 15

PCB PATTERN LAYOUT ...................................................................................16~19

"

MAIN ................................................................................................................. 16

"

POWER / TAPE ................................................................................................. 17

"

MP3 CD ............................................................................................................. 18

"

FRONT .............................................................................................................. 19

ELECTRICAL PART LIST

..........................................................................

Appendix

Table of Contents

1

MINI COMPONENT SYSTEM

XG-318

Service Manual

S/N No. :

FEB. 2004

DAEWOO DAT CO., LTD.

Mini Component System

Model:

XG-318

9CD8302500

XG-318

APR. 2004

Safety Precautions

2

Safety Precautions

3

WARNING

: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE

THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION :

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT
REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS
INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE"

WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE

SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK TO PERSONS.

THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE
(SERVICING) INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE APPLIANCE.

CAUTION

TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC
PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET
UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE
EXPOSURE.

LASER SAFETY

THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL
SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE
DUE TO POSSIBLE EYE INJURY.

CAUTION :

USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES

OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS
RADIATION EXPOSURE.

CAUTION :

TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF

PLUG TO WIDE SLOT, FULLY INSERT.

ATTENTION :

POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPON­DANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.

Important Safety Instructions

- All the safety and operating instructions should be read before

the appliance is operated.

- The safety and operating instructions should be retained for

future reference.

- All warnings on the appliance and in the operating instructions

should be adhered to.

- All operating and use instructions should be followed.

1. Water and Moisture - The appliance should not be used near

water - for example, near a bathtub, washbowl, kitchen sink,

laundry tub, in a wet basement, or near a swimming pool,
and the like.

2. Carts and Stands - The appliance
should be used only with a cart or
stand that is recommended by th
manufacturer.

3. An appliance and cart combination

should be moved with care. Quick

stops, excessive force, and uneven
surfaces may cause the appliance

and cart combination to overturn.

4. Wall or Ceiling Mounting - The appli-

ance should be mounted to a wall or

ceiling only as recommended by the manufacturer.

5. Ventilation - The appliance should be situated so that its

location or position does not interfere with its proper

ventilation. For example, the appliance should not be situated

on a bed, sofa, rug, or similar surface that may block the

ventilation openings; or, placed in a built-in installation, such

as a bookcase or cabinet that may impede the flow of air
through the ventilation openings.

6. Heat - The appliance should be situated away from heat

sources such as radiators, heat registers, stoves, or other

appliances (including amplifiers) that produce heat.

7. Power Sources - The appliance should be connected to a

power supply only of the type described in the operating

instructions or as marked on the appliance.

8. Grounding or Polarization - The precautions that should be

taken so that the grounding or polarization means of an
appliance is not defeated.

9. Power - Cord Protection - Power-supply cords should be

routed so that they are not likely to be walked on or pinched

by items placed upon or against them, paying particular

attention to cords at plugs, convenience receptacles, and the

point where they exit from the appliance.

10.Protective Attachment Plug - If the appliance is equipped with

an attachment plug having overload protection. This is a

safety feature. See Instruction Manual for replacement or

resetting of protective device. If replacement of the plug is

required, be sure the service technician has used a

replacement plug specified by the manufacturer that has the
same overload protection as the original plug.

11.Cleaning - The appliance should be cleaned only as
recommended by the manufacturer.

12.Power Lines - An outdoor antenna should be located away
from power lines.

CAUTION

RISK OF ELECTRIC SHOCKS

DO NOT OPEN

PORTABLE CART

Figure 2

13.Outdoor Antenna Grounding - If an outside antenna is

connected to the receiver be sure the antenna system is
grounded so as to provide some protection against voltage

surges and built-up static charges. Article 810 of the National

Electrical Code, ANSI/NFPA 70, provides information with

regard to proper grounding of the mast and supporting
structure, grounding of the lead-in wire to an antenna-dis
charge unit, size of grounding conductors,location of antenna­discharge unit, connection to grounding electrodes and
requirements for the grounding electrode. See Figure 1.

14.Non-use Periods - The power cord of the appliance should be

unplugged from the outlet when left unused for a long period
of time.

15.Object and Liquid Entry - Care should be taken so that objects
do not fall and liquids are not spilled into the enclosure through
openings.

16.Damage Requiring Service - The appliance should be
serviced by qualified service personnel when:

a) The power-supply cord or the plug has been damaged; or

b) Objects have fallen, or liquid has been spilled into the
appliance; or
c) The appliance has been exposed to rain; or

d) The appliance does not appear to operate normally or

exhibits a marked change in performance; or

e) The appliance has been dropped, or the enclosure
damaged.

17.Servicing - The user should not attempt to service the
appliance beyond that described in the operating instructions.

All other servicing should be referred to qualified service
personnel.

ANTENNA DISCHARGE UNIT
(NEC SECTION 810-20)

ANTENNA LEAD
IN WIRE

POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250 PART H)

GROUND CLAMP

ELECTRIC
SERVICE
EQUIPMENT

GROUNDING CONDUCTORS
(NEC SECTION 810-21)

GROUND CLAMPS

EXAMPLE OF ANTENNA
GROUNDING

NEC - NATIONAL ELECTRICAL CODE

Adjustments

5

Adjustments

4

2. TAPE SECTION

Test Tape be used

HEAD ADJUSTMENT (AZIMUTH)

1. 10KHz test tape(example: MTT-114N) must be used for this adjustment.

2. Connect to VTVM or oscilloscope to the headphone jack or speaker terminal.

3. Press the play button.

4. Adjust the azimuth by using a screw driver to maintain the max. L&R output voltage.

5. Adjust tape A(1), tape B(2) respectively, Please secure the azimuth position by using locking paint.

RECORDING BIAS OSCILLATOR FREQUENCY ADJUSTMENT

1. Connect the frequency counter to TP603, GND.

2. Press the REC button.

3. Adjust L603 to obtain 80 KHz

±

500Hz

Tape Contents Use

MTT-111N 3 KHz Tape Speed Adjustment
MTT-114N 10 KHz Head Azimuth Adjustment
MTT-5511 Blank Record Frequency Property

VTVM

Scope

R-CH

L-CH

47 kohm

47 kohm

Input Level
Measurement
Point

Input Point

Output Level

Measurement

Point

TAPE ALIGNMENT CHART

Step Item Reference Value Test Tape Adjust Point Test Point Note FIG.

1

Tape Speed
Adjustment

Normal

3,015~3,025Hz MTT-111N RV601

Line Out L/R
Channel

Line Out L/R
Channel

Confirm Wow & Flut­ter is within 0.35%

FIG.1

3,000~3,010Hz MTT-111N RV601

Line Out L/R
Channel

Confirm Tape Speed
of end position after
adjustment at tape
start position

FIG.1

High

5,820~6,180Hz MTT-111N - - - - - -

Confirm High speed
after normal speed
adjustment

FIG.1

2

Azimuth Adjustment

Maximum Level
Phase:Within90∞

MTT-114N Head Screw

Line Out L/R
Channel

FIG.2,3,4

3

Recording Bias Oscilla­tor Frequency Adjust-

ment

80 KHz

±0.5

MTT-5511 L603

TP603,GND

Adjust with frequency
counter connected.

FIG.1

FIG. 1 : Tape Speed & Record Bias Oscillator

Frequency Adjust Circuit

Test Tape : MTT-111N(3kHz)

MTT-5511(Blank)

Frequency Counter

Output Level
Measurement Point

Set

FIG. 2 : Tape Azimuth Adjust Location

(Record/Playback Head)

FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform

FIG. 4 : Tape Azimuth Adjust Circuit & Waveform

Forward

Side

Reverse

Side

Adjust with Frequency

Counter Connected

L-CH
Peak

R-CH

Peak
Screw
Angle

Output Level

within

1 dB

within

1 dB

L-CH
Peak

R-CH
Peak

Screw Angle

VH

Oscilloscope

L-CH

Output Level
Measurement Point

Set

Test Tape
MTT-114N

(10kHz)

Screen Pattern

In Phase 45 90 135 180

Good Wrong

Exploded View and Mechanical Parts List

6

Exploded View and Mechanical Parts List

7

Wiring Diagram

8

Block Diagram

9

Schematic Diagram

10

"

AMP

21 20

19

11

15

14

2

12

17

4

5

7
8
6

18

9

16

13

3

10

22

1

VSS VT

N.C

MUTE

AM OSC

1/2

VT-IN FM/AM IF N.C VDD

IF REQ

DO

DI

CL

C B
I/F

AM/FM

PD

FM OSC

ST/MO

X-OUT

X-IN

FM

CE

1

ANT5VT8OSC3GND4GND6B+

2

ANT7IFOUT

OUT

3

14

13

1

2

10

6 5 4 9 8 7 11 12

2
3

1 4 7

5 8
69

13

11 14

1210

1 2 3 4 5

24

22 21 2023 1718 1619 15 14 13

10

9876

1211

VCC

SD
DET

GND

LED
DRIVER

V REG

FM
IF

AM
OSCAMMIX

FM
DET

AGC

AM
DET

SW

1/2

1/2

SD

DECORDER

COMP

PD

VCO

Schematic Diagram

11

"

TUNER

Schematic Diagram

12

"

TAPE

MP3 CD

Schematic Diagram

13

Schematic Diagram

14

"

FRONT

Schematic Diagram

15

"

POWER