MANUAL SERVICE
(RAS136F) RAD136 MODEL:
P/NO : AFN74972256 |
FEBRUARY, 2011 |
Internal Use Only
Website http://biz.lgservice.com
Mini Hi-Fi System
SERVICE MANUAL
MODEL: RAD136 (RAS136F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
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CONTENTS |
SECTION 1 |
........GENERAL |
SECTION 2 ........ |
CABINET & MAIN CHASSIS |
SECTION 3 ........ |
ELECTRICAL |
SECTION 4 ........ |
REPLACEMENT PARTS LIST |
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1-1
SECTION 1
SUMMARY
CONTENTS
SERVICING PRECAUTIONS................................................................................................................... |
1-3 |
ESD PRECAUTIONS.................................................................................................................................. |
1-5 |
SERVICE INFORMATION FOR EEPROM .......................................................................................... |
1-6 |
PROGRAM DOWNLOAD GUIDE........................................................................................................... |
1-7 |
SPECIFICATIONS ....................................................................................................................................... |
1-9 |
1-2
SERVICING PRECAUTIONS
NOTES REGARDING HANDLING OF THE PICK-UP
1.Notes for transport and storage
1)The pick-up should always be left in its conductive bag until immediately prior to use.
2)The pick-up should never be subjected to external pressure or impact.
Storage in conductive bag |
Drop impact |
2.Repair notes
1)The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2)The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board.
3)Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched.
4)Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
NEVER look directly at the laser beam, and don’t allow contact with fingers or other exposed skin.
5)Cleaning the lens surface
If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort lens.
Pressure 
Magnet
Pressure
How to hold the pick-up
Cotton swab
Conductive Sheet
6)Never attempt to disassemble the pick-up.
Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.
(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.
1-3
NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. |
Preparations |
1) |
Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components |
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are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components |
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can be damaged, and for that reason components should be handled with care. |
2) |
The pick-up is composed of many optical components and other high-precision components. Care must be |
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taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magnet- |
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ism is present, or where there is excessive dust. |
2. |
Notes for repair |
1)Before replacing a component part, first disconnect the power supply lead wire from the unit
2)All equipment, measuring instruments and tools must be grounded.
3)The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.)
4)To prevent AC leakage, the metal part of the soldering iron should be grounded.
5)Workers should be grounded by an armband (1 MΩ)
6)Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband.
7)The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Armband |
Resistor
(1 MΩ)
Resistor
(1 MΩ) Conductive
Sheet
1-4
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.
2.After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3.Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ESD devices.
5.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD devices.
6.Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials).
7.Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS.
8.Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device).
CAUTION. GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.
1-5
SERVICE INFORMATION FOR EEPROM
POWER ON
FLD no disc status or AUX status.
Remote control ‘2’ + Front ‘STOP’ push same timing during 5 seconds.
DETECT NEW EEPROM (OPTION EDIT SCREEN)
NAME HEX
FLD ‘OP-0…. |
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OPT0 |
09 |
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OPT1 |
00 |
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OPT2 |
00 |
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OPT3 |
00 |
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OPT4 |
00 |
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Move to appropriate position and |
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OPT5 |
68 |
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make changes with remote control |
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OPT6 |
80 |
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‘skip, mode, play’ key. |
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OPT7 |
05 |
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OPT8 |
30 |
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OPT9 |
08 |
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Press STOP key |
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FLD ‘write ok’
Remote control ‘Fwd skip’ +
Front ‘STOP’ push same timing
FLD ‘E2P CLR’
Completed
1-6
PROGRAM DOWNLOAD GUIDE
1. AUDIO PROGRAM
Download program file name must be RAD136.HEX
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
ON VFD DISPLAY SCREEN
NO USB
↓← Insert USB device at USB function
READ
↓
FIRMWARE
↓
WRITE 00 .. 100
↓
UPDATED
↓
POWER OFF AUTOMATICALLY ← When completed, remove USB device.
1-7
2. CD PROGRAM
Download program file name must be HB001_DATE_00.BIN
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the usb device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
ON VFD DISPLAY SCREEN
NO USB
↓← Insert usb device at USB function
READ
↓
FIRMWARE
↓
WRITE 00 .. 100
↓
FINISH
↓
POWER OFF AUTOMATICALLY ← When completed, remove USB device.
1-8
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SPECIFICATIONS |
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• GENERAL |
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Power supply |
Refer to main label. |
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Power consumption |
Refer to main label. |
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Net Weight |
3.1 kg |
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External dimensions (W x H x D) |
202 x 307 x 297.5 mm (without foot) |
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BUS power supply (USB) |
DC 5 V |
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500 mA |
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Operating conditions Temperature |
5 °C ~ 35 °C |
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Operation status: Horizontal |
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Operating humidity |
5 % ~ 90 % |
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Laser |
Semiconductor laser, wavelength 650 nm |
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• INPUTS/OUTPUTS |
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Analog Audio In |
2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L,R)x 1 |
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• TUNER FM / AM[MW] |
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FM Tuning Range |
87.5 to 108.0 MHz or 87.50 to 108.00 MHz |
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FM Intermediate Frequency |
128 kHz |
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AM Tuning Range (Optional) |
522 to 1 620 kHz, 520 to 1 710 kHz or 522 to 1 710 kHz |
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AM Intermediate Frequency |
45 kHz |
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• AMPLIFIER |
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Output Power |
65 W + 65 W (4 Ω at 1 kHz, THD 10 %) |
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• CD |
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Frequency response |
40 Hz - 20 kHz |
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Signal-to-noise ratio |
75 dB |
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Dynamic range |
80 dB |
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• SPEAKER |
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Type |
2 Way 2 Speaker |
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Impedance |
4 Ω |
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Rated Input Power |
65 W |
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Max. Input Power |
130 W |
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Net Dimensions (W x H x D) |
214 x 308 x 245 mm |
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Net Weight (1EA) |
2.51 kg |
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1-9
MEMO
1-10
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS..................................................................................................................................... |
2-3 |
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1. |
CABINET AND MAIN FRAME SECTION (RAD136) ................................................................................ |
2-3 |
2. |
MECHANISM DECK SECTION (CDM-345) ............................................................................................. |
2-5 |
3. PACKING ACCESSORY SECTION ......................................................................................................... |
2-7 |
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4. |
SPEAKER SECTION (RAS136F) ............................................................................................................. |
2-8 |
2-1
MEMO
2-2
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION (RAD136)
460
261 |
460 |
260L
460
262
460 |
264 |
451
NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.
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F |
A47 |
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460 |
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FRONT |
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C |
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A43 |
CABLE2 |
SMPS |
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E |
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USB |
460 |
A |
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D |
276 |
460 |
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460 |
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B |
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A42 |
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A26 |
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H
259
G
460 |
D |
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265
A44
A |
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460 |
B |
MAIN |
260R |
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251 |
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A46 |
460 |
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H |
E |
G |
F
460
273 |
274 |
C
300
2-3 |
2-4 |
2. MECHANISM DECK SECTION (CDM-345)
A26 |
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A02 |
001 |
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018 |
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A01 |
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002 |
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439 |
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014 |
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013 |
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020 |
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003 |
017 |
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015 |
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012A |
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010 |
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432 |
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036 |
431 |
016 |
012 |
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012A |
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019 |
432 |
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026 |
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012 |
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A03 |
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037 |
MEMO
2-5 |
2-6 |
3. PACKING ACCESSORY SECTION
801 Instruction Ass'y
808 Battery
803Packing
804Bag
803Packing
2-7
824ANTENNA, LOOP (AM)
825 FM Wire Antenna
900 Remote Control
802 Box
4. SPEAKER SECTION (RAS136F)
• FRONT SPEAKER
A60
2-8
SECTION 3
ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE................................................................................................................... |
3-2 |
1. NO POWER............................................................................................................................................ |
3-2 |
2. NO BOOTING WHEN POWER ON THE SET ....................................................................................... |
3-4 |
3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET..................................................................... |
3-5 |
4. NO OPERATION OF MD ....................................................................................................................... |
3-6 |
5. NO SOUND .......................................................................................................................................... |
3-11 |
AUDIO ELECTRICAL TROUBLESHOOTING GUIDE .................................................................. |
3-16 |
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1. |
POWER (SMPS)................................................................................................................................... |
3-16 |
2. |
μ-COM PART CHECK.......................................................................................................................... |
3-20 |
3. |
IC101(S24CS16A01) CHECK .............................................................................................................. |
3-20 |
4. |
FLD DISPLAY CHECK ......................................................................................................................... |
3-21 |
5. PWM MODULATION CHECK .............................................................................................................. |
3-22 |
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6. POWER AMP PART CHECK ............................................................................................................... |
3-24 |
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7. TUNER / AUX FUNCTION CHECK...................................................................................................... |
3-25 |
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8. TUNER FUNCTION CHECK ................................................................................................................ |
3-26 |
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CDP ELECTRICAL TROUBLESHOOTING GUIDE ....................................................................... |
3-27 |
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1. |
CD FUNCTION ..................................................................................................................................... |
3-27 |
2. |
USB FUNCTION................................................................................................................................... |
3-28 |
WAVEFORMS............................................................................................................................................. |
3-29 |
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WIRING DIAGRAM ................................................................................................................................... |
3-33 |
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BLOCK DIAGRAMS................................................................................................................................. |
3-35 |
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1. OVERALL BLOCK DIAGRAM .............................................................................................................. |
3-35 |
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2. SMPS BLOCK DIAGRAM..................................................................................................................... |
3-37 |
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CIRCUIT DIAGRAMS............................................................................................................................... |
3-39 |
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1. |
SMPS CIRCUIT DIAGRAM .................................................................................................................. |
3-39 |
2. |
MICOM & AD CIRCUIT DIAGRAM ...................................................................................................... |
3-41 |
3. PWM & AMP CIRCUIT DIAGRAM ....................................................................................................... |
3-43 |
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4. CD DSP & SERVO CIRCUIT DIAGRAM ............................................................................................. |
3-45 |
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5. |
FRONT CIRCUIT DIAGRAM................................................................................................................ |
3-47 |
6. |
USB CIRCUIT DIAGRAM..................................................................................................................... |
3-49 |
CIRCUIT VOLTAGE CHART................................................................................................................. |
3-51 |
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PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................... |
3-55 |
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1. |
MAIN P.C.BOARD ................................................................................................................................ |
3-55 |
2. |
SMPS P.C.BOARD............................................................................................................................... |
3-59 |
3. |
FRONT P.C.BOARD............................................................................................................................. |
3-60 |
4. |
USB P.C.BOARD.................................................................................................................................. |
3-61 |
3-1
ONE POINT REPAIR GUIDE
1. NO POWER
If the unit doesn’t work by no power problem, repair the set according to the following guide.
1-1. FUSE & BRIDGE DIODE
1-1-1. Solution
Please check and replace F901, BD901, TH901 on SMPS board.
1-1-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode DB901 is short-circuit by over current with a digital multi meter. 3) Check if the NTC thermistor TH901 is normal or open.
1-1-3. Service hint (Any picture / Remark)
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< F901 > |
< BD901 > |
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< TH901 > |
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If F901 is not short-circuit, |
If BD901 is short-circuit, |
If TH901 is open, |
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replace it with a same |
replace it with a new one. |
replace it with a new one. |
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specifications one. |
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3-2 |
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ONE POINT REPAIR GUIDE
NO POWER
If the unit doesn’t work by no power problem, repair the set according to the following guide.
1-2. D929
1-2-1. Solution
Please check and replace D929 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check the Anode-Cathod Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V. If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.
1-2-3. Service hint (Any picture / Remark) |
< SMPS schematic diagram >
3-3
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