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Service Manual
MINI COMPONENT SYSTEM
Model : AMI-225M/MU
AMI-325M/MU
DAEWOO ELECTRONICS CO., LTD.
MINI COMPONENT SYSTEM
AMI-225M/MU
AMI-325M/MU
Table of Contents
Model No:AMI-225M/MU, 325M/MU
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
-1-
Safety Precautions
WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE laundry tub, in a wet basement, or near a swimming pool,
THIS APPLIANCE TO RAIN OR MOISTURE. and the like.
2. Carts and Stands - The appliance
CAUTION PORTABLE CART
should be used only with a cart or
RISK OF ELECTRIC SHOCKS stand that is recommended by th
DO NOT OPEN manufacturer.
3. An appliance and cart combination
CAUTION :TO REDUCE THE RISK IF ELECTRIC SHOCK, DO NOT should be moved with care. Quick
REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS stops, excessive force, and uneven
INSIDE. surfaces may cause the appliance
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. and cart combination to overturn.
Figure 2 4. Wall or Ceiling Mounting - The appli-
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE" ance should be mounted to a wall or
WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE ceiling only as recommended by the manufacturer.
SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF 5. Ventilation - The appliance should be situated so that its
ELECTRIC SHOCK TO PERSONS. location or position does not interfere with its proper
ventilation. For example, the appliance should not be situated
THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE on a bed, sofa, rug, or similar surface that may block the
(SERVICING) INSTRUCTIONS IN THE LITERATURE ventilation openings; or, placed in a built-in installation, such
ACCOMPANYING THE APPLIANCE. as a bookcase or cabinet that may impede the flow of air
through the ventilation openings.
CAUTION 6. Heat - The appliance should be situated away from heat
TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC
sources such as radiators, heat registers, stoves, or other
PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET
UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE appliances (including amplifiers) that produce heat.
EXPOSURE. 7. Power Sources - The appliance should be connected to a
power supply only of the type described in the operating
LASER SAFETY instructions or as marked on the appliance.
THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL
8. Grounding or Polarization - The precautions that should be
SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE
DUE TO POSSIBLE EYE INJURY. taken so that the grounding or polarization means of an
appliance is not defeated.
CAUTION : USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES 9. Power - Cord Protection - Power-supply cords should be
OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS routed so that they are not likely to be walked on or pinched
RADIATION EXPOSURE. by items placed upon or against them, paying particular
attention to cords at plugs, convenience receptacles, and the
CAUTION : TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
PLUG TO WIDE SLOT, FULLY INSERT. point where they exit from the appliance.
10.Protective Attachment Plug - The appliance is equipped with
ATTENTION : POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE an attachment plug having overload protection. This is a
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPON- safety feature. See Instruction Manual for replacement or
DANTE DE LA PRISE ET POUSSER JUSQU'AU FOND. 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
Important Safety Instructions same overload protection as the original plug.
- All the safety and operating instructions should be read before 11.Cleaning - The appliance should be cleaned only as
the appliance is operated. recommended by the manufacturer.
- The safety and operating instructions should be retained for 12.Power Lines - An outdoor antenna should be located away
future reference. from power lines.
- 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,
-2-
Safety Precautions
13.Outdoor Antenna Grounding - If an outside antenna is 15.Object and Liquid Entry - Care should be taken so that objects
connected to the receiver be sure the antenna system is do not fall and liquids are not spilled into the enclosure through
grounded so as to provide some protection against voltage openings.
surges and built-up static charges. Article 810 of the National 16.Damage Requiring Service - The appliance should be
Electrical Code, ANSI/NFPA 70, provides information with serviced by qualified service personnel when:
regard to proper grounding of the mast and supporting a) The power-supply cord or the plug has been damaged; or
structure, grounding of the lead-in wire to an antenna-dis b) Objects have fallen, or liquid has been spilled into the
charge unit, size of grounding conductors,location of antenna- appliance; or
discharge unit, connection to grounding electrodes and c) The appliance has been exposed to rain; or
requirements for the grounding electrode. See Figure 1. 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
EXAMPLE OF ANTENNA
GROUNDING ANTENNA LEAD
damaged.
IN WIRE
17.Servicing - The user should not attempt to service the
appliance beyond that described in the operating instructions.
GROUND CLAMP All other servicing should be referred to qualified service
ANTENNA DISCHARGE UNIT
(NEC SECTION 810-20) personnel.
GROUNDING CONDUCTORS
ELECTRIC (NEC SECTION 810-21)
SERVICE
EQUIPMENT
GROUND CLAMPS
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
NEC - NATIONAL ELECTRICAL CODE (NEC ART 250 PART H)
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.
-3-
Adjustments
FM RF SSG FM Antenna
Terminal(75 ohm)
75 ohm Coaxal
SET
Carrier Frequency : 98MHz
Output Level : 26dBuV
Modulation:Audio 1kHZ, 75kHz Deviation
Check Point Confirm
Confir m FM
wave
Confir m ster eo
indicator is
lighted and L/R
channel is
seper ated.
: No Adjustment : OPTION
RF Signal Waveform
VOLT/DIV : 200mV
TIME/DIV : 50ns
Level : 1.2+0.3Vp-p
Traverse Waveform
A
0V
B
-4-
Output Level
Measurement Input Point
Point Scope
R-CH 47 kohm
VTVM
Input Level
Measurement
Point
L-CH 47 kohm
RV701
RV701
L601
Adjust with Frequency
Counter Connected
Test Tape : MTT-111N(3kHz) Frequency Counter
MTT-5511(Blank)
Set
Output Level
Measurement Point
Forward Reverse
Side Side
Test Tape
MTT-114N
(10kHz)
L-CH L-CH Oscilloscope
Peak
Set V H
within
Output Level
1 dB
within
1 dB
R-CH Output Level
Peak Measurement Point
Screw
Angle
Screen Pattern
L-CH R-CH Screw Angle In Phase 45 90 135 180
Peak Peak
Good Wrong
Exploded View and Mechanical Parts List
Model No:AMI-225M/MU, 325M/MU
-6-
Mechanical Part List
NO Part Name Parts Code Description Q'ty Comment
1 PANEL FRONT 9CD0307900 MIPS 1
2 WINDOW FLT 9CD1616400 ACRYL 1
3 DOOR CASS A 9CD18111A0 MIPS 1
4 DOOR CASS B 9CD18111B0 MIPS 1
5 WINDOW DOOR A 9CD16163A0 ACRYL 1
6 WINDOW DOOR B 9CD16163B0 ACRYL 1
7 KNOB VOLUME 9CD1339800 ABS 1
8 SPRING DOOR EJECT 9CD3004500 PW-1 2
9 SPRING C HOLDER 9713008900 STS (T=0.2) 4
10 CUSHION FOOT 9CD4207700 URETHAN FOAM RUBBER 2
9CD2603000
11 DAMPER ASSY DA-12A 1
9CD2603100
12 BRAKET SIDE 9CD2412900 ABS 2
13 KNOB CONTROL 9CD1339500 ABS 1
14 KNOB CD 9CD1339700 ABS 1
15 KNOB POWER 9CD1339600 ABS 1
16 SHAFT VR 9CD3601900 ACETAL 1
17 SHAFT WASHER 9CD3602000 ACETAL 2
18 SPRING TUNING 9CD3007000 SUS D0.6 ACD-7600 1
19 CASS DECK MECHANISM 9CD6007900 AUTO STOP 1 OPTION
20 KNOB DECK A 9CD13329R1 ABS 1
21 KNOB DECK B 9CD13330R1 ABS 1
22 DOOR CD 9CD1811200 MIPS 1
23 CD DECK MECHSNISM 9CD6006900 DCC-01B 1
24 HEAT SINK 05 9CD4405100 AL (5W) 1
24-1 HEAT SINK 1 9CD4404500 AL (10W) 1 OPTION
25 CHASSIS BOTTOM 9CD0608000 MIPS 1
26 COVER SIDE L 9CD04115L0 MIPS 1
27 COVER SIDE R 9CD04115R0 MIPS 1
28 COVER BACK 9CD0409801 MIPS 1
29 COVER TOP 9CD0411400 MIPS 1
30 PLATE EON 9CD0910100 PVC SHEET 1
31 COVER ANT 9CD0410400 ABS 1 OPTION
32 LABEL SPK (6