Samsung MAX-A55 Schematic
Three-CD Changer
MINI-Compact System
Model Name : MAX-A55U
Model Code : MAX-A55U/XAH
SERVICE
Manual
Three-CD Changer MINI-Compact System
1. Precaution
2. Product Specification
3. Disassembly & Reassembly
4. Troubleshooting
5. Exploded View & Part List
6. PCB Diagram
7. Schematic Diagram
MAX-A55U
CONTENTS
Refer to the service manual in the GSPN (see the rear cover) for the more information.
GSPN (Global Service Partner Network)
Area Web Site
North America service.samsungportal.com
Latin America latin.samsungportal.com
CIS cis.samsungportal.com
Europe europe.samsungportal.com
China china.samsungportal.com
Asia asia.samsungportal.com
Mideast & Africa mea.samsungportal.com
This Service Manual is a property of Samsung Electronics
Co.,Ltd. Any unauthorized use of Manual can be punished
under applicable International and/or domestic law.
© Samsung Electronics Co.,Ltd.
Printed in Korea
Sep. 2008
Contents
1. Precaution
1-1 Safety Precautions ............................................................................................1-1
1-2 Servicing Precautions ........................................................................................
1-3 Precautions for Electrostatically Sensitive Devices (ESDs) ..............................
2. Product Specification
2-1 Product Feature ................................................................................................. 2-1
2-2 Specifications ....................................................................................................
2-3 Specifications Analysis ......................................................................................
2-4 Accessories .......................................................................................................
3. Disassembly & Reassembly
3-1 Overall Disassembly & Reassembly ..................................................................3-1
1-3
1-4
2-2
2-3
2-4
4. Troubleshooting
4-1 Checkpoints by Error Mode ...............................................................................4-2
4-2 Measures to be taken when the Protection Circuit operates .............................
4-3 MICOM Initialization & Update ..........................................................................
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 FRONT PCB Top ...............................................................................................
6-3 FRONT PCB Bottom .........................................................................................
6-4 MAIN PCB Top ..................................................................................................
6-5 MAIN PCB Bottom .............................................................................................
6-6 SMPS PCB Top .................................................................................................
6-7 SMPS PCB Bottom ............................................................................................
4-8
4-9
6-3
6-5
6-6
6-8
6-10
6-12
Contents
7. Schematic Diagram
7-1 Overall Block Diagram ....................................................................................... 7-2
7-2 FRONT ..............................................................................................................
7-3 MAIN-1 ..............................................................................................................
7-4 MAIN-2 ..............................................................................................................
7-5 CD .....................................................................................................................
7-6 SMPS (MAX-A54U) ...........................................................................................
7-7 SMPS (MAX-A55U) ...........................................................................................
7-3
7-4
7-5
7-6
7-7
7-8
Precaution
1. Precaution
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards such
as electrical shock and X-rays.
1-1 Safety Precautions
1. Be sure that all of the built-in protective devices are replaced.
2. When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including control
knobs and compartment covers.
3. Make sure that there are no cabinet openings through which people--particularly children--might insert fingers
and contact dangerous voltages. Such openings include the spacing between the picture tube and the cabinet
mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.
4. Design Alteration Warning:
Never alter or add to the mechanical or electrical design of the unit.
Example: Do not add auxiliary audio or video connectors. Such alterations might create a safety hazard.
Also, any design changes or additions will void the manufacturer’s warranty.
5. Leakage Current Hot Check (Fig. 1-1):
Warning: Do not use an isolation transformer during this
test. Use a leakage-current tester or a metering system
that complies with American National Standards Institute
(ANSI C101.1, Leakage Current for Appliances), and
Underwriters Laboratories (UL Publication UL1410,
59.7).
With the unit completely reassembled, plug the AC line
cord directly into a 120V AC outlet. With the unit’s AC
switch first in the ON position and then OFF, measure
the current between a known earth ground (metal water
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC
ADAPTER PLUG
AS REQUIRED)
<Fig. 1-1 AC Leakage Test>
LEAKAGE
CURRENT
TESTER
(READING
SHOULD NOT BE
ABOVE 0.5mA)
EARTH
GROUND
pipe, etc.) and all exposed metal parts. Examples:
Handle brackets, metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5
milliamp. Reverse the powerplug prongs in the AC outlet and repeat.
6. Insulation Resistance Cold Check:
(1) With the unit’s AC plug disconnected from the AC
source, connect an electrical jumper across the two AC
Antenna
Terminal
prongs. (2) Set the power switch to ON. (3) Measure
the resistance between the shorted AC plug and any
exposed metallic parts.
Example: Screwheads, antenna, control shafts or handle
brackets.
Exposed
Metal Part
ohm
Ohmmeter
<Fig. 1-2 Insulation Resistance Test>
If any of the exposed metallic parts has a return path
to the chassis, the measured resistance should be between 1 and 5.2 megohms. If there is no return path, the
measured resistance should be “infinite.” If the resistance is outside these limits, a shock hazard might exist.
See Fig. 1-2.
Samsung Electronics 1-1
1-2 Samsung Electronics
Precaution
7. Components, parts and wiring that appear to have overheated or that are otherwise damaged should be
replaced with parts that meet the original specifications. Always determine the cause of damage or overheating,
and correct any potential hazards.
8. Observe the original lead dress, especially near the following areas: Antenna wiring, sharp edges, and
especially the AC and high voltage power supplies. Always inspect for pinched, out-of-place, or frayed wiring.
Do not change the spacing between components and the printed circuit board. Check the AC power cord for
damage. Make sure that no wires or components touch thermally hot parts.
9. Product Safety Notice:
Some electrical and mechanical parts have special safety-related characteristics which might not be obvious
from visual inspection. These safety features and the protection they give might be lost if the replacement
component differs from the original--even if the replacement is rated for higher voltage, wattage, etc.
10. Components that are critical for safety are indicated in the circuit diagram by shading,
or . Use
replacement components that have the same ratings, especially for flame resistance and dielectric strength
specifications. A replacement part that does not have the same safety characteristics as the original might
create shock, fire or other hazards.
Precaution
1-2 Servicing Precautions
1. Servicing precautions are printed on the cabinet. Follow them.
2. Always unplug the unit’s AC power cord from the AC power source before attempting to: (a) Remove or reinstall
any component or assembly, (b) Disconnect an electrical plug or connector, (c) Connect a test component in
parallel with an electrolytic capacitor.
3. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes
used. The internal wiring may be clamped to prevent contact with thermally hot components. Reinstall all such
elements to their original position.
4. After servicing, always check that the screws, components and wiring have been correctly reinstalled.
Make sure that the portion around the serviced part has not been damaged.
5. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal
panels, input terminals and earphone jacks).
6. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.
Connect an insulation resistance meter (500V) to the blades of the AC plug.
The insulation resistance between each blade of the AC plug and accessible conductive parts (see above)
should be greater than 1 megohm.
7. Never defeat any of the B+ voltage interlocks. Do not apply AC power to the unit (or any of its assemblies)
unless all solid-state heat sinks are correctly installed.
8. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive
lead; always remove the instrument’s ground lead last.
First read the “Safety Precautions” section of this manual. If some unforeseen circumstance
creates a conflict between the servicing and safety precautions, always follow the safety
precautions.
Samsung Electronics 1-3
Precaution
1-3 Precautions for Electrostatically Sensitive Devices (ESDs)
1. Some semiconductor (“solid state”) devices are easily damaged by static electricity.
Such components are called Electrostatically Sensitive Devices (ESDs). Examples include integrated circuits
and some field-effect transistors. The following techniques will reduce the occurrence of component damage
caused by static electricity.
2. Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from
your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. (Be sure to
remove it prior to applying power--this is an electric shock precaution.)
3. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent
accumulation of electrostatic charge.
4. Do not use freon-propelled chemicals. These can generate electrical charges that damage ESDs.
5. Use only a grounded-tip soldering iron when soldering or unsoldering ESDs.
6. Use only an anti-static solder removal device. Many solder removal devices are not rated as “anti-static” (these
can accumulate sufficient electrical charge to damage ESDs).
7. Do not remove a replacement ESD from its protective package until you are ready to install it.
Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam,
aluminum foil or other conductive materials.
8. Immediately before removing the protective material from the leads of a replacement ESD, touch the protective
material to the chassis or circuit assembly into which the device will be installed.
9. Minimize body motions when handing unpackaged replacement ESDs. Motions such as brushing clothes
together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an ESD.
1-4 Samsung Electronics
2. Product Specification
2-1 Product Feature
Output Power
- AMP TYPE: ANALOG AMP
- OUTPUT: 90W x 2
TOTAL: 180W (PMPO 3000W)
Features
- CD-R/RW, MP3, WMA
- Section Repeat: Repeat the section while learning foreign language
- Provide clear & unique display
Design Concept
- Focus on D.I appeals to Emotional Sense
- High-tech movement & reaction emphasize reliable performances
- Maximized one point extreme usability
- Powerful looking (Volcano Concept)
Product Specification
Samsung Electronics 2-1
Product Specification
2-2 Specifications
Basic Specification
RADIO
FM
COMPACT
DISC
PLAYER
AMPLIFIER
GENERAL
Signal/noise ratio
Usable sensitivity
Total harmonic
distortion
Capacity 3 discs
Frequency range
Signal/noise ratio
Distortion 0.05 % (at 1 KHz)
Channel separation
Disc sizes
Output power (4 Ω)
Front Speaker
Channel separation
Signal/noise ratio
Power Consumption
Dimensions 270 (W) x 332 (H) x 372 (D) mm
62 dB
10 dB
0.3 %
20 Hz - 20 KHz (± 1 dB)
90 dB (at 1 KHz) with filter
74 dB
Diameter: 120 or 80 mm. Thickness: 1.2 mm
50 Watts/CH RMS, IEC (total harmonic distortion: 10 %) (MAX-A54U)
90 Watts/CH RMS, IEC (total harmonic distortion: 10 %) (MAX-A55U)
45 dB
75 dB
35W (MAX-A54U)
50W (MAX-A55U)
Weight 3.8 Kg
2-2 Samsung Electronics
2-3 Specifications Analysis
Model Name MAX-A54U MAX-A55U MM-X8
Photo
RMS 100W 180W 100W
Product Specification
OUTPUT POWER
FRONT DISPLY
SLEEP
DIMMER
CD/CD-R/CD-RW
MP3
USB HOST
CD RIPPING
EQ/DSP
AUDIO IN
HEAD JACK/MIC
AM X X
FM
RDS (ONLY EUROPE) (ONLY EUROPE) (ONLY EUROPE)
RESET MEMORY
50 x 2 90 x 2 40 x 2
VFD VFD VFD
X X
X X
(3.5φ) (3.5φ) (3.5φ)
15 15 30
9 MODE
REMOTE KEY
UNIVERSAL
DUAL VOLTAGE
SPK IMPEDANCE
35 key 35 key 38 key
4Ω 4Ω 4Ω
: application, X: non-application
Samsung Electronics 2-3
Product Specification
2-4 Accessories
2-4-1 Supplied Accessories
Accessories Item Item code Remark
Remote Control
FM Antenna
User’s Manual
AH59-02054A
AH42-00021A
AH68-02127L
Samsung Service Center
2-4 Samsung Electronics
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
/
CABINET-
REAR
1) Unfasten 15 screws.
: BH 3*10 BLACK
Be careful not to make any
scratches as you remove it.
Samsung Electronics 3-1
3-2 Samsung Electronics
Disassembly & Reassembly
No. Part Name Description Description Photo
2 CABINET-
TOP
/
CD-Door
3 CD-DECK
/
CABINET-
REAR
1) Pull up and remove the CABINET-
TOP.
2) Power on and open the disk,
separate CD-Door.
1) Pull up and remove the CD-DECK.
2) Unfasten the screws and remove
CABINET-REAR.
: BH 3*10 BLACK
Disassembly & Reassembly
No. Part Name Description Description Photo
4 BOARD 1) Unfasten the screws and separate
MAIN PCB and SMPS.
: BH 3*8 WHITE - 1EA
: BH 3*14 WHITE - 4EA
: BH 3*10 BLACK - 1EA
5 HOLDER-
SMPS
1) Unfasten the 2 screws.
: BH,2s,3*8,white
Samsung Electronics 3-3
Disassembly & Reassembly
No. Part Name Description Description Photo
6 ASSY-
FRONT
1) Pull the hook at 1 and 2 of and
separate ASSY-FRONT.
1
2
2) Unfasten 17 screws.
: BH 3*10 BLACK
3-4 Samsung Electronics
Troubleshooting
4. Troubleshooting
4-1 Checkpoints by Error Mode ................................................................4-2
4-2 Measures to be taken when the Protection Circuit operates ...........
4-3 MICOM Initialization & Update ............................................................
4-8
4-9
Samsung Electronics 4-1
Troubleshooting
4-1 Checkpoints by Error Mode
4-1-1 No Power
No Power
Refer to wave pattern
image of Fig. 4-1.
Check MAIN PCB UIC1
Pin 14, 40, 55 and 89: 5V
Yes
Check MAIN PCB
UIC1 Pin 20: 5V
Yes
Check VFD Voltage in
MAIN PCB PCW03A
Pin 13, 14 and 15
Yes
No
No
No
Check MAIN PCB
PCW03A Pin 10: 5.6V
Yes
Check MAIN PCB
PCW03A Pin 11 P-S: 5V
Check or replace SMPS
No
Check or replace SMPS
Check or replace SMPS
Check reset circuit in
MAIN PCB UX2/UQ1
part ok?
Yes
Refer to wave pattern
image of Fig. 4-2.
Replace MICOM IC
No
Replace UX2, UQ1 parts
4-2 Samsung Electronics
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