Daewoo AMI-722, AMI-822L, AMI-822М Service Manual
Service Manual
MINI COMPONENT SYSTEM
Model :
AMI-722/AMI-822M
DAEWOO ELECTRONICS CO., LTD.
TABLE OF CONTENTS
SAFETY PRECAUTIONS ................................................................................................. 2
ADJUSTMENTS............................................................................................................. 4
EXPLODED VIEW AND PARTS LIST ................................................................................. 7
WIRING DIAGRAM ...................................................................................................... 9
BLOCK DIAGRAM ....................................................................................................... 10
SCHEMATIC DIAGRAM................................................................................................ 11
POWER / AMP ................................................................................................................................... 11
CD.................................................................................................................................................... 12
TUNER ............................................................................................................................................... 13
TUNER-FTZ (OPTIONAL) ....................................................................................................................... 14
TAPE ................................................................................................................................................. 15
CONTROL.......................................................................................................................................... 16
PCB PATTERN LAYOUT.................................................................................................. 17
ELECTRICAL PARTS LIST................................................................................................ 19
1
SAFETY PRECAUTIONS
WARNING
THIS APPLIANCE TO RAIN OR MOISTURE.
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.
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 :
OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS
RADIATION EXPOSURE.
CAUTION :
PLUG TO WIDE SLOT, FULLY INSERT.
ATTENTION :
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.
: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
CAUTION
RISK OF ELECTRIC SHOCKS
DO NOT OPEN
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
LASER SAFETY
USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE
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
water - for example, near a bathtub, washbowl, kitchen sink,
used near
laundry tub, in a wet basement, or near a swimming pool,
and the like.
PORTABLE CART
Figure 2
ceiling only as recommended by the manufacturer.
5. Ventilation - The appliance should be situated so
location or position does not interfere with
ventilation. For example, the appliance
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
through the ventilation openings.
6. Heat - The appliance should be situated away from
sources such as radiators, heat registers,
appliances (including amplifiers) that
7. Power Sources - The appliance should be
power supply only of the type described in the operating
instructions or as marked on the appliance.
8. Grounding or Polarization - The precautions that
taken so that the grounding or polarization means of an
appliance is not defeated.
9. Power - Cord Protection - Power-supply cords
routed so that they are not likely to be
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
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
from power lines.
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
that its
its proper
should not be situated
stoves, or other
produce heat.
connected to a
should be
should be
walked on or pinched
protection. This is a
of air
heat
away
2
SAFETY PRECAUTIONS
13.Outdoor Antenna Grounding - If an outside antenna
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.
EXAMPLE OF ANTENNA
GROUNDING
GROUND CLAMP
ELECTRIC
SERVICE
EQUIPMENT
NEC - NATIONAL ELECTRICAL CODE
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250 PART H)
ANTENNA LEAD
IN WIRE
ANTENNA DISCHARGE UNIT
(NEC SECTION 810-20)
GROUNDING CONDUCTORS
(NEC SECTION 810-21)
GROUND CLAMPS
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.
is
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
b) Objects have fallen, or liquid has been spilled
damaged; or
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.
3
ADJUSTMENTS
1. TUNER SECTION
TEST EQUIPMENT
FM RF SSG
75 ohm Coaxal
FM Antenna
Terminal(75 ohm)
1. Signal Generator with a frequency range of FM broadcast.
2. Oscilloscope with a side amplifier of approximately 100 KHz.
3. FM 75/50Ω dummy antenna.
4. VTVM
Carrier Frequency : 98MHz
Output Level : 26dBuV
Modulation:Audio 1kHZ, 75kHz Deviation
SET
FM 75/50Ω
Dummy
FM ALIGNMENT
1. Turn on the FM signal generator and the VTVM allowing 15 minutes warming-up period.
2. Connect the VTVM across the headphone jack or speaker terminal.
3. Set signal generator frequency as listed in ALIGNMENT CHART and maintain a sufficient output level to provide an
indication on VTVM.
NOTE
1. Use a screwdriver with plastic or ceramic grip for all adjustments.
2. Standard test frequency 1 KHz and deviation 75 KHz for FM.
- FM RF, IF ALIGNMENT CHART -
Step Item Input Circuit Setup Output Circuit Setup Tuner Setting Adjust Point Adjustment
1
2
FM IF
Adjustment
Auto Stop
Sensitivity
Connect stereo signal
generator to FM ANT
terminal (J001)
Connect stereo signal
generator to FM ANT
terminal (J001)
Connect DC voltme-
ter across R201
Connect DC voltme-
ter across RV201
FM98MHz75KHz
Dev. 26dB
FM 98MHz
75KHz Dev.
26dB
µ
µ
L203
RV201
Adjust forDC 0V±0.1V
Adjust for DC
1.17V±0.02V
Confirm stereo indica-
tor is lighted and L/R
channel is separated.
Unless other specified set being switched FM mode, adjust generator's frequency to center of the FM band where no FM broadcast exists
Otherwise adjustment of FM usable sensitivity, frequency range for FM band are not needed, but confirm these data are satisfied with specification.
CAUTION : When realigning the FM receiving frequency the highest end of the frequency range should not be more than 108 MHz and the
lowest end of the frequency range should not be less than 87.5 MHz, in order to comply with FTZ regulation in West Germany.
2. CD SECTION
Note:
1. Use the oscilloscope with more than 10M
2. Clean the laser object lens using natural detergent and a soft applicator when the signal level is lower than the value as indicated in
the following checks.
RF LEVEL CHECK
1. Connect oscilloscope to test point TP502 and IC502
Pin66 on CD PCB.
2. Press power switch on.
3. Put test disc(TCD-781) in and press play button then
pause button.
4. Confirm that oscilloscope waveform is clear. Clear
RF signal waveform means that the shape"#"can be
clearly distinguished at the center of waveform.
5. Adjust RV501 to get a clear waveform and maximum
amplitude.
Ω
impedance.
RF Signal Waveform
VOLT/DIV : 200mV
TIME/DIV : 50ns
Level : 1.2+0.3Vp-p
4
E-F BALANCE ADJUSTMENT
Output Level
1. Connect oscilloscope to test point TP502 and TP503
on CD PCB.
2. Press power switch on.
3. Put test disc(TCD-781) in and press play button then
pause button.
4. Press Fast Forward button and adjust RV502 for a
symmetrical waveform on the oscilloscope in relation
to 0V.
* Design and specifications may be subject to change without notice.
3. TAPE SECTION
ADJUSTMENTS
Traverse Waveform
A
0V
B
Measurement
Input Level
Measurement
Point
Point
R-CH
L-CH
47 kohm
47 kohm
Input Point
VTVM
Test Tape be used
Tape Contents Use
MTT-111N 3 KHz Tape Speed Adjustment
MTT-114N 10 KHz Head Azimuth Adjustment
MTT-5511 Blank Record Frequency Property
HEAD ADJUSTMENT (AZIMUTH)
1. 10KHz test tape(example: MTT-114N) must be used for this adjustment.
2. Connect to a VTVM or oscilloscope to the headphone jack or speaker terminal.
3. Press the play button.
4. Adjust the azimuth by using a screwdriver 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.
Scope
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±100Hz
5
ADJUSTMENTS
Frequency Counter
Test Tape
TAPE ALIGNMENT CHART
Step Item Reference Value Test Tape Adjust Point Test Point Note FIG.
Be sure Wow & Flutter is within 0.35%
Normal 3,000~3,010Hz MTT-111N RV601
1
Tape Speed
Adjustment
High 5,820~6,180Hz MTT-111N - - - - - -
2 Azimuth Adjustment
Recording Bias Oscilla-
3
tor Frequency Adjustment
Maximum Level
Phase:Within90°
80 KHz±0.5
Line Out L/R
Channel
Shorted
TP601,
TP602
MTT-114N Head Screw
Line Out L/R
Channel
MTT-5511 L603 TP603,GND
Adjust Tape Speed of
end position after
adjustment at tape
start position
Confirm High speed
after normal speed
adjustment
Adjust with frequency
counter connected.
FIG.1
FIG.1
FIG.2,3,4
FIG.1
Test Tape : MTT-111N(3kHz)
MTT-5511(Blank)
Set
Output Level
Measurement Point
FIG. 1 : Tape Speed & Record Bias Oscillator
Frequency Adjust Circuit
L-CH
Peak
within
1 dB
R-CH
Screw
Angle
Peak
Output Level
L-CH
Peak
R-CH
Peak
within
1 dB
Screw Angle
Adjust with Frequency
Counter Connected
Forward
Side
Reverse
Side
FIG. 2 : Tape Azimuth Adjust Location
(Record/Playback Head)
MTT-114N
(10kHz)
L-CH
Set
Screen Pattern
In Phase 45 90 135 180
Good Wrong
Oscilloscope
V H
Output Level
Measurement Point
FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform
FIG. 4 : Tape Azimuth Adjust Circuit & Waveform
6
EXPLODED VIEW AND MECHANICAL PARTS LIST
7
EXPLODED VIEW AND MECHANICAL PARTS LIST
MODEL : AMI-322L / 522L / 722L / 822L
No Part Code Part Name Q’ty Description
1 9CD0307100 PANEL FRONT 1 MIPS
2 9CD1500900 BADGE DAEWOO 1 ABS
3 9CD1810500 DOOR CASSETTE A/B 1 MIPS
4 9CD16153B0 WINDOW DOOR A/B 1 ACRYL
5
6 9CD3007800 SRING DOOR EJECT L/R 1
7 9CD1810600 DOOR CD 1 MIPS
8 9CD1615400 WINDOW FLT 1 ACRYL
9 9CD1337900 KNOB FUNCTION 1 ACRYL
10 9CD1338000 KNOB CD 1 ABS
11 9CD1338100 KNOB POWER 1 ABS
12 9CD1338200 KNOB CONTROL 1 ABS
13 9CD13383L0 KNOB EQ L 1 ABS
14 9CD13383R0 KNOB EQ R 11 ABS
15 9CD1334400 KNOB VOLUME 1 ABS
16 9CD2505600 GUIDE FLT 1 ABS
16-1 9CD2505900 GUIDE FLT 1 ABS (ONLY AMI-822L)
17 9CD0910700 PLATE FILTER 1 PC T0.3
18 9CD2412900 BRKT SIDE 2 ABS X 2EA
19 9CD2603200 DAMPER GEAR B 2 X 2EA
20 9CD2603300 DAMPER BASE B 2 X 2EA
21 9CDOB01900 LOCKER BASE 2 X 2EA
22 9CDOB02000 LOCKER CAM 2 X 2EA
23 9CDOB01600 LOCKER SPRING 2 X 2EA
24 9CD6007000 CASSETTE DECK LOGIC 1 ADR-2138MW
25 9CD4207700 CUSHION FOOT 2 URETHAN X 2EA
26 9CD0411100 COVER BACK 1 MIPS
27 9CD0411000 COVER TOP 1 MIPS
27-1 9CD0409100 COVER TOP 1 MIPS (ONLY AMI-722L/822L)
28 9CD0607500 CHASSIS BOTTOM 1 ABS
28-1 9CD0607100 CHASSIS BOTTOM 1 SECC 1.0T
29 9CD4404500 HEAT SINK 1 1 AL (ONLY AMI-322L)
29-1 9CD4405000 HEAT SINK 2 AL (ONLY AMI-522L)
29-2 9CD4404600 HEAT SINK 3 AL (ONLY AMI-722L)
29-3 9CD4404700 HEAT SINK 5 AL (ONLY AMI-822L)
30 9CD4207900 RUBBER SILICON 1 SILICON RUBBER (ONLY AMI-322L)
9CD1809400
DOOR FRAME A/B 1 ABS
9CD1809500
No Part Code Part Name Q’ty Description
31 9CD2413900 BRACKET HEAT TR 1 SUS 0.3T (ONLY AMI-322L/522L)
32 9CD04112L0 COVER SIDE L 1 MIPS
33 9CD04112R0 COVER SIDE R 1 MIPS
34 9CD0410400 COVER ANT 1 ABS
36 9CD6007000 CD DECK MECHA 1
37 9CD4402800 HEAT SINK 1 BSP 0.5T
38 9CD3102400 WASHER SCREW 1
39 9CD0909800 PLATE FLT PVC SHEET T1.0 X 2EA
40 9CD0910000 PLATE FUNCTION PVC SHEET T0.5
41 9CD1612900 WINDOW TOP ACRYL (ONLY AMI-722L/822L)
42 9CD1002200 DECO TOP ACRYL (ONLY AMI-722L/822L)
S1 7173261011 SCREW TAPTTITE 17 TT2 BIN 2.6 X 10 MFZN X 18EA
S2 7173301011 SCREW TAPTTITE 23 TT2 BIN 3.0X10 MFZN X 13EA
S3 7173301212 SCREW TAPTTITE 14 TT2 BIN 3.0X12 BK X 22EA
S4 7173301612 SCREW TAPTTITE 2 TT2 BIN 3.0X16 BK X 2EA
S5 7173400611 SCREW TAPTTITE 2 TT2 BIN 4.0X6 MFZN X 4EA
S5-1 7173401011 SCREW TAPTTITE 2 TT2 BIN 4.0X10 MFZN
8
WIRING DIAGRAM
9
BLOCK DIAGRAM
10
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