Samsung MM-DA25 User manual

SERVICE
Manual
MICRO COMPONENT
AUDIO SYSTEM
Model Name: MM-DA25
Model Code : MM-DA25Q/XER
MICRO COMPONENT AUDIO SYSTEM
Refer to the service manual in the GSPN (see the rear cover) for the more information.
CONTENTS
1. Precaution
2. Product Specification
3. Disassembly & Reassembly
4. Troubleshooting
5. Exploded View & Part List
6. PCB Diagram
7. Schematic Diagram
MM-DA25

Contents
1. Precaution
1-1 Safety Precautions...........................................................................................1-1
1-2 Servicing Precautions ......................................................................................1-3
1-3 Precautions for Electrostatically Sensitive Devices (ESDs).............................1-4
2. Product Specification
2-1 Product Feature ...............................................................................................2-1
2-2 Specifications...................................................................................................2-2
2-3 Specifications Analysis.....................................................................................2-4
2-4 Accessories......................................................................................................2-5
3. Disassembly & Reassembly
3-1 Overall Disassembly & Reassembly................................................................3-1
4. Troubleshooting
4-1 Checkpoints by Error Mode..............................................................................4-2
4-2 Measures to be taken when the Protection Circuit operates ...........................4-7
4-3 DVD flash Initialization & Update ...................................................................4-8
5. Exploded View & Part List
5-1 Exploded View .................................................................................................5-2
5-2 Electrical Part List ............................................................................................5-4
6. PCB Diagram
6-1 Wiring Diagram ................................................................................................6-2
6-2 MIC PCB Top ...................................................................................................6-3
6-3 MIC PCB Bottom..............................................................................................6-5
6-4 FRONT PCB Top..............................................................................................6-6
6-5 FRONT PCB Bottom........................................................................................6-8
6-6 MAIN PCB Top.................................................................................................6-9
6-7 MAIN PCB Bottom ...........................................................................................6-11
6-8 MPEG PCB Top ...............................................................................................6-13
6-9 MPEG PCB Bottom..........................................................................................6-15
6-10 SMPS PCB Top................................................................................................6-16
6-11 SMPS PCB Bottom..........................................................................................6-18
6-12 CD PCB Top.....................................................................................................6-19

Contents
7. Schematic Diagram
7-1 Overall Block Diagram .....................................................................................7-2
7-2 MAIN-1.............................................................................................................7-3
7-3 MAIN-2.............................................................................................................7-4
7-4 MPEG...............................................................................................................7-5
7-5 SMPS (MM-A24)..............................................................................................7-6
7-6 SMPS (MM-A25)..............................................................................................7-7
7-7 SMPS (MM-DA25) ...........................................................................................7-8
7-8 1 DISC CD ......................................................................................................7-9

Samsung Electronics 2-1
Product Specification
2. Product Specification
2-1 Product Feature
On top of the Sound Quality, Portable Device Connection, and Stylish Design, Samsung
create its own specialty by adding distinguishing feature.
Target Focusing on Powerful Sound
Customer Needs Who prefers Good Design & Alarm Function
Design Compact & Stylish Concept
User Benefits - Easy Alarm Setting
- USB Host
Region Europe, CIS, Korea
Key Features
- RMS 20W/CH
- Alarm & Morning Call
- MP3-CD Playback
- USB Host Play
Variation MP3
MM-A25/A24/DA25
Stylish Design
Matching with MP3P
Compact & Stylish concept
Sound Quality
No Distortion & New Volume
Curve
MP3P Docking
Docking with portable Device
MM-X7

2-2 Samsung Electronics
Product Specification
2-2 Specifications
Basic Specification
GENERAL
Power source 50 W
Weight 2.5 Kg
Dimensions (W x H x D) 170 x 212 x 293 mm
Operating Temperature Range +5°C ~ +35°C
Operating Humidity Range 10% ~ 75%
FM TUNER
Usable Sensitivity 3 dB
S/N Ratio 60 dB
Distortion 1.0 %
MW TUNER
Usable Sensitivity 56 dB
S/N Ratio 40 dB
Distortion 2 %
VIDEO
OUTPUT
Composite Video 1.0 Vp-p (75Ω load)
Component Video
Y: 1.0 Vp-p (75Ω load)
Pr: 0.7 Vp-p (75Ω load)
Pb: 0.7 Vp-p (75Ω load)
AMPLIFIER
Speaker output 50W/CH
Frequency range 20Hz ~ 20kHz
S/N Ratio 75 dB
Channel separation 50 dB
Input sensitivity (AUX) 500mV
SPEAKER
Impedance 4Ω x 2
Frequency range 20 Hz - 20 KHz (± 1 dB)
Output sound pressure level 84dB/W/M
Rated input 50 W
Maximum input 100 W
Dimensions (W x H x D) 170 x 212 x 293 mm
Weights 2.5 Kg

Samsung Electronics 2-3
Product Specification
2-3 Specifications Analysis
Model Name MM-A24 MM-A25 MM-DA25 MM-X8
Photo
OUTPUT POWER 20 x 2 50 x 2 50 x 2 40 x 2
FRONT DISPLY VFD VFD VFD VFD
SLEEP    
DIMMER    
CD/CD-R/CD-RW    
MP3    
USB HOST    
CD RIPPING XXX
EQ/DSP X X X 9 MODE
AUDIO IN X X  
HEAD JACK/MIC    
AM XXX
FM    
RDS   

(ONLY EUROPE)
RESET MEMORY 20 20 20 30
REMOTE KEY 34 Key 34 Key 38 Key 38 Key
UNIVERSAL X X  
DUAL VOLTAGE X X  
SPK IMPEDANCE 4W 4W 4W 4W
: application, X: non-application

2-4 Samsung Electronics
Product Specification
2-4 Accessories
2-4-1 Supplied Accessories
Accessories Item Item code Remark
Remote Control AH59-01960B
Samsung Service Center
FM Antenna AH39-00320C
Video Cable AH39-40001V
User’s Manual AH68-02050P
Cloth Clean AH81-02286C

Samsung Electronics 3-1
Disassembly & Reassembly
3. Disassembly & Reassembly
3-1 Overall Disassembly & Reassembly
- Be careful to follow the disassembly sequence described in the manual. Otherwise, the product
may be damaged.
- Be sure to carefully read and understand the safety instructions before performing any work as
the IC chips on the PCB are vulnerable to static electricity.
- Assemble in the reverse order of disassembly.
No. Part Name Description Description Photo
1 CABINET-
SIDE 1) Unfasten 8 screws on the CABINET- SIDE-L\R.
: 3X10mm,black
Be careful not to make any
scratches as you remove it.
2 CABINET-
TOP 1) Turn over the hook of CABINET-TOP.

3-2 Samsung Electronics
Disassembly & Reassembly
No. Part Name Description Description Photo
3 CABINET-
FRONT 1) Turn over the hook of CABINET- BOTTOM and separateASSY-
FRONT.
4 FRONT-PCB 1) Unfasten 4 screws and turn over the
hook of FRONT-PCB.
: 3X10mm,white

Samsung Electronics 3-3
Disassembly & Reassembly
No. Part Name Description Description Photo
5 CABINET-
REAR
&
MAIN-PCB
1) Unfasten 3 screws on the CABINET-
REAR and the one on the MAIN-
PCB.
: 3X10mm,white
6 SMPS
&
DECK
1) Unfasten 6 screws on the SMPS and
DECK.
: 3X10mm,white

Samsung Electronics 4-1
Troubleshooting
4. Troubleshooting
4-1 Checkpoints by Error Mode ................................................................4-2
4-2 Measures to be taken when the Protection Circuit operates...........4-7
4-3 DVD flash Initialization & Update ......................................................4-8

4-2 Samsung Electronics
Troubleshooting
4-1 Checkpoints by Error Mode
4-1-1 No Power
Check for
POWER-SENSE (5V) in
MAIN PCB PCW3 pin 11
MAIN PCB PCW3 Pin 10
voltage (5.60V)?
Check VFD Voltage in
MAIN PCB PCW3
pin 15, 14, 13
CHECK or REPLACE SMPS
CHECK or REPLACE SMPS
Yes
No
Yes
No
Yes
No
The power does not turn on.
Check for RESET/OSC parts in Main
PCB: X-TAL1, UQ1
CHECK or REPLACE SMPS

Samsung Electronics 4-3
Troubleshooting
4-1-2 No Output
Check Signal
at FIC1 (R2S15904) on MAIN PCB
(Pin 26, 27 → 1KHz)
Yes
No Check Signal
in MAIN PCB FIC2
(Pin 1, 7 → 1KHz)
Yes
No Output
No
OUTPUT CHECKPARTS OPEN/SHORT
Check Mode on
AAIC1 (Pin 23)
(L: Mute, H: Normal)
REPLACE AAIC1
MICOM UIC1
Pin 47 (L: Normal, H: Mute)
Pin 48 (H: Normal, L: Mute)
Low
High
Check Voltage on
AAC6 (+22V or +15V)
AAC7 (-22V or -15V) SMPS CHECK
No
Yes
Refer to wave pattern
image of Fig. 4-1. Refer to wave pattern image of Fig. 4-1.

4-4 Samsung Electronics Troubleshooting
MAIN-1 Page, 7-3
FCW1
MJW59
FCW10
MCW10
TCON13
PCW3
FIC1
FIC2
UIC1
MAIN PCB Bottom Page, 6-11
<Fig. 4-1>
1
1
1
2
2
2

Samsung Electronics 4-5
Troubleshooting
4-1-3 CD NO PLAY OR NO SOUND
PLAYING OK
No Sound
No Play MAIN PCB DIC1
OUTPUT (5V)
NG
CD NO PLAY OR NO SOUND
OK
CD DECK CHECKREPLACE SMPS
Check CD-Mute
on UIC1 P69
(H: Mute, L: Normal)
NO OUTPUT CHECK
RESET SET OR CHECK
UIC1
High
Low

4-6 Samsung Electronics
Troubleshooting
4-1-4 CD PACK
CD PACK 5V CHECK MAIN PCB to CD PCB 30 PIN
Connector Check
No
Yes
No CD PACK
CD POWER CHECK (DIC1: 7805)
PLAYING OK

Samsung Electronics 4-7
Troubleshooting
4-2 Measures to be taken when the Protection Circuit operates
4-2-1 Operation of Power Block Protection Circuit
Protection Circuit operates when power problem occurs in the SMPS.
SMPS
Part
Location Pin No. Protection Circuit Operation Remark
Open Short
CN3
+8V (1) X X
+5V (3,4) X X
+5.6V (11) X X
CN2
PVDD (about 11V) (1~2) X X
-12V (7) X X
+12V (9) X X
<Table 4-1>
4-2-2 Power Protection
The Power Protection Circuit operates in the following cases.
1. When over-current is generated in the amplifier IC (over-output or short-circuits in the output block.)
2. When the temperature of the amplifier IC exceeds 160°C.
3. When no power is supplied to the Gate Driver.

4-8 Samsung Electronics
Troubleshooting
4-3 DVD flash Initialization & Update
Micom Initialize
In STANDBY mode, push the ‘STOP’ button on front panel 5second.
Micom update (Only flash type Micom IC)
There is hole for update Micom at the bottom of case.
Required computer, ROM writer (SANYO), USB cable, Update file.
MPEG Version Check
1. Insert CD.
2. Open DISC. (Don’t pull off disc now)
3. Push button in remote ‘8’, ‘9’, ‘5’ sequentially.
4. MPEG Version will be on the VFD.
Micom Version Check
1. Turn off SET.
2. Push the FF button on the front panel 5 second.
3. MPEG Version will be on the VFD.
MPEG Flash Update
1. Save update ROM file to USB drive.
2. Function change to USB mode. Then plug in USB drive.
3. ‘UPDATING’ message will be on the VFD and SET will turn off and turn on.

Samsung Electronics 5-1
Exploded View & Part List
This Document can not be used without Samsung’s authorization.
5. Exploded View & Part List
5-1 Exploded View......................................................................................5-2
5-2 Electrical Part List................................................................................5-4

5-2 Samsung Electronics Exploded View & Part List
This Document can not be used without Samsung’s authorization.
5-1 Exploded View
AC320
AK250
AC255 AD300
AC010
AD480
AK420
AC010
AK170
AL210
AC060
AH383
AC050
AC085
AC070
AC330
AC020
BRACK
AC080
AM020