Daewoo AMI-325MU, AMI-225MU Service Manual

Service Manual

MINI COMPONENT SYSTEM

Model :

DAEWOO ELECTRONICS CO., LTD.

AMI-225M/MU
AMI-325M/MU

Table of Contents

Model No:AMI-225M/MU, 325M/MU

- 1 -

SAFETY PRECAUTIONS......................................................................................... 2

ADJUSTMENTS....................................................................................................... 4

EXPLODED VIEW AND PARTS LIST ...................................................................... 6

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

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

SCHEMATIC DIAGRAM ........................................................................................... 10

POWER / AMP ................................................................................................................................ 10

CD ......................................................................................................................................................12

TUNER ...............................................................................................................................................13

TAPE .................................................................................................................................................14

CONTROL .........................................................................................................................................15

PCB PATTERN LAYOUT ........................................................................................ 16

ELECTRICAL PART LIST ....................................................................................... 19

Safety Precautions

- 2 -

WARNING

: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE

THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION :

TO REDUCE THE RISK IF 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 - 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

Safety Precautions

- 3 -

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

- 4 -

SET

FM Antenna

Terminal(75 ohm)

Carrier Frequency : 98MHz
Output Level : 26dBuV
Modulation:Audio 1kHZ, 75kHz Deviation

FM RF SSG

75 ohm Coaxal

Level : 1.2+0.3Vp-p

RF Signal Waveform

VOLT/DIV : 200mV

TIME/DIV : 50ns

Traverse Waveform

A

B

0V

Check Point

Confirm

: No Adjustment : OPTION

Confirm stereo
indicator is
lighted and L/R
channel is
seperated.

Confirm FM
wave

VTVM

Scope

R-CH

L-CH

47 kohm

47 kohm

Input Level
Measurement
Point

Input Point

Output Level

Measurement

Point

Test Tape : MTT-111N(3kHz)

MTT-5511(Blank)

Frequency Counter

Output Level
Measurement Point

Set

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

V H

Oscilloscope

L-CH

Output Level
Measurement Point

Set

Test Tape
MTT-114N

(10kHz)

Screen Pattern

In Phase 45 90 135 180

Good Wrong

RV701

RV701

L601

Exploded View and Mechanical Parts List

- 6 -

Model No:AMI-225M/MU, 325M/MU

- 7 -

Mechanical Part List

NO Part Name Parts Code Q'ty Comment

1 PANEL FRONT 9CD0307900 1
2 WINDOW FLT 9CD1616400 1
3 DOOR CASS A 9CD18111A0 1
4 DOOR CASS B 9CD18111B0 1
5 WINDOW DOOR A 9CD16163A0 1
6 WINDOW DOOR B 9CD16163B0 1
7 KNOB VOLUME 9CD1339800 1
8 SPRING DOOR EJECT 9CD3004500 2
9 SPRING C HOLDER 9713008900 4

10 CUSHION FOOT 9CD4207700 2
11 DAMPER ASSY

9CD2603000

9CD2603100

1

12 BRAKET SIDE 9CD2412900 2
13 KNOB CONTROL 9CD1339500 1
14 KNOB CD 9CD1339700 1
15 KNOB POWER 9CD1339600 1
16 SHAFT VR 9CD3601900 1
17 SHAFT WASHER 9CD3602000 2
18 SPRING TUNING 9CD3007000 1
19

CASS DECK MECHANISM

9CD6007900 1

OPTION

20 KNOB DECK A 9CD13329R1 1
21 KNOB DECK B 9CD13330R1 1
22 DOOR CD 9CD1811200 1
23 CD DECK MECHSNISM 9CD6006900 1
24 HEAT SINK 05 9CD4405100 1

24-1 HEAT SINK 1 9CD4404500 1 OPTION

25 CHASSIS BOTTOM 9CD0608000 1
26 COVER SIDE L 9CD04115L0 1
27 COVER SIDE R 9CD04115R0 1
28 COVER BACK 9CD0409801 1
29 COVER TOP 9CD0411400 1
30 PLATE EON 9CD0910100 1
31 COVER ANT 9CD0410400 1

OPTION

32 LABEL SPK (6¥Ø) 9CD9309400 1

S1 SCREW TAPPTITE 7173260811 11
S2 SCREW TAPPTITE 7173301011 17
S3 SCREW TAPPTITE 7173301212 18
S4 SCREW TAPPTITE 7173401011 4
S5 SCREW TAPPTITE 7173300811 5
S6 WASHER SCREW 9CD3102400 1

P1 PCB FRONT 9CD6579800 1
P2 PCB MAIN 9CD6580000 1
P3 PCB FUSE 9CD6579700 1
P4 PCB GUIDE 9CD6579801 1

ABS

MIPS

ABS
ABS
ABS

ACETAL

SUS D0.6 ACD-7600

AUTO STOP

ABS
ABS

Description

MIPS

ACRYL

MIPS
MIPS

ACRYL

ACETAL

ACRYL

PW-1

ABS

STS (T=0.2)

URETHAN FOAM RUBBER

DA-12A

MIPS

DCC-01B

AL (5W)

MIPS

AL (10W)

MIPS
MIPS
MIPS

PVC SHEET

ABS

PE FILM

TT2 BIN 3X12 BK

TT2 BIN 4X10 MFZN

TT2 BIN 2.6X8 MFZN

TT2 BIN 3X10 MFZN

34 x 75 x 1.6T
13 x 32 x 1.6T

330 x 197 x 1.6T

247 x 139 x 1.6T

TT2 BIN 3X8 MFZN
TT2 BIN 3X10+D14

- 8 -

AMI-225M/MU, 325M/MU

A3A3

CASETTE DECK

M

M

FRONT PCB ASSY
S/N :

MAIN PCB ASSY
S/N :

POWER TRANS

Pick-Up

FUSE PCB ASSY
S/N :

MM

CD MECHA. ASS'Y

MM

AC CORD

WIRING DIAGRAM