lg dvs 8521n Diagram

CONTENTS
SECTION 1 . . . .SUMMARY
SECTION 2 . . . .CABINET & MAIN CHASSIS
SECTION 3 . . . .ELECTRICAL
SECTION 4 . . . .MECHANISM
SECTION 5 . . . .REPLACEMENT PARTS LIST
SECTION 1
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
........................... 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SPECIFICATIONS ...................................................................................................................... 1-5
1-2
1-3
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC­TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC­TION FROM A.C. LINE SHOCK.
SAFETY CHECKS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.
SUBJECT : FIRE & SHOCK HAZARD
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.
3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.
4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR­CUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI­NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN­DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT­METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS­TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON­DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.
SUBJECT: 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.
SUBJECT : X-RADIATION
1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER­SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN­TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC­TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA­TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC­TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR­CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR­ABLE LEVELS.
2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALL THEM.
3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA TION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR.
4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA­NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU­LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE­DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON EACH CUSTOMER’S INVOICE.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES SIVE VOLTAGE.
6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED).
SUBJECT: IMPLOSION
1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.
2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
SUBJECT : TIPS ON PROPER INSTALLATION
1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY­HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.
2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA­TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC­ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER­CIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.
5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED.
6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ­ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS.
7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF THE SAME OR LARGER SCREEN SIZE.
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN­GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
A.C. VOLTMETER
GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC
PLACE THIS PROBE ON EACH EXPOSED METAL PART
1-4
SERVICING PRECAUTIONS
CAUTION : Before servicing the DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circum­stances create conflict between the following servicing pre­cautions and any of the safety precautions in this publica­tions, always follow the safety precautions. Remembers Safety First:
General Servicing Precautions
1. Always unplug the DVD AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnection or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an elec-
trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.
2. Do not spray chemicals on or near this DVD or any of its assemblies.
3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipped.
5. Do not apply AC power to this DVD and/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed.
6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resis­tance between each blade of the attachment plug and acces­sible conductive parts (Note 1) should be more than 1M­ohm. Note 1 : Accessible Conductive Parts including Metal pan­els, Input terminals, Earphone jacks, etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES 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 ES 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 grouned-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.
Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally 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 ES device.)
1-5
SPECIFICATIONS
• GENERAL
Power requirements AC 110~240V, 50/60Hz
Power consumption 12W
Dimensions(approx.) 360 x 39 x 242mm (W/h/d)
Mass(approx.) 1.95kg Operating temperature 5˚C to 35˚C (41˚F to 95˚F)
Operating humidity 5% to 90%
• OUTPUTS
VIDEO OUT 1 V (p-p) 75 , sync negative, RCA jack x 1
S-VIDEO OUT (Y) 1.0 V (p-p), 75 , negative sync, Mini DIN 4-pin X 1
(C) 0.3V (p-p) 75
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 , negative sync, RCA jack x 1
(Pb)/(Pr) 0.7V (p-p), 75 , RCA jack x 2
AUDIO OUTPUT 2.0 Vrms (1 kHz, 0 dB), 600 Ω,
RCA jack (L, R) x 1
DIGITAL OUT (COAXIAL) 0.5 V (p-p), 75 , RCA jack X 1
DIGITAL OUT (PITicAL) 3 V (p-p), 75 , Optical connector X 1
• SYSTEM
Laser Semiconductor laser, wavelength 650nm
Signal system PAL/NTSC
Frequency response DVD (PCM 96kHz): 8Hz to 44kHz
DVD (PCM 48kHz): 8Hz to 22kHz
CD: 8Hz to 20kHz
Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only)
Harmonic distortion Less than 0.008%
Dynamic range More than 90 dB(DVD/CD)
• ACCESSORIES
Video Cable (1), Audio Cable (1), Remote control (1), Batteries (2)
2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
1. EXPLODED VIEWS ................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Packing Accessory Section....................................................................................................2-3
2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
463
A00
283
261
261
261
261
260
A49
A43
A44
A46
A47
A42
280
300
452
452
463
463
250
465
320
467
463
A
5
4
3
2
1
BCD
2-3
2. Packing Accessory Section
BATTERY
808
PACKING SHEET
804
PACKING
OPTIONAL PARTS
803
806
820
OWNER'S MANUAL
RF CABLE
810
CABLE SET ASS'Y
801
REMOCON
900
BOX CARTON
802
PACKING
803
811
812
PLUG ASS'Y 1WAY(YELLOW)
PLUG ASS'Y 1WAY(BLACK)
PLUG ASS'Y 2WAY
3-1
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2
1. Power check flow.....................................................................................................................3-2
2. System operation flow ............................................................................................................3-3
3. Test & debug flow ....................................................................................................................3-4
4. KARAOKE Flow (KARAOKE MODEL ONLY).......................................................................3-10
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....................3-11
1. SYSTEM 27MHz CLOCK, RESET SIGNAL ...........................................................................3-11
2. SDRAM CLOCK......................................................................................................................3-12
3. TRAY OPEN/CLOSE SIGNAL ................................................................................................3-12
4. SLED CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-14
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-14
6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)............................3-15
7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-16
8. FOCUS ON WAVEFORM........................................................................................................3-17
9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION...................................................3-18
10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-19
11. RF WAVEFORM ....................................................................................................................3-20
12. M3355 AUDIO OPTICAL AND COAXIAL OUTPUT(ASPDIF) .............................................3-20
13.M3355 VIDEO OUTPUT WAVEFORM...................................................................................3-21
14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-22
BLOCK DIAGRAMS ..................................................................................................................3-24
1. Overall Block Diagram ..........................................................................................................3-24
2. Power(SMPS) Block Diagram ...............................................................................................3-25
3. SERVO Block Diagram ..........................................................................................................3-26
4. MPEG & MEMORY Block Diagram .......................................................................................3-27
5. VIDEO & AUDIO Block Diagram ...........................................................................................3-28
6. KARAOKE Block Diagram(KARAOKE MODEL ONLY).......................................................3-29
CIRCUIT DIAGRAMS................................................................................................................3-30
1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-30
2. AV/JACK Circuit DIAGRAM...................................................................................................3-32
3. SYSTEM Circuit DIAGRAM ...................................................................................................3-34
4. DRIVER Circuit DIAGRAM.....................................................................................................3-36
5. TIMER Circuit DIAGRAM .......................................................................................................3-38
• CIRCUIT VOLTAGE CHART ....................................................................................................3-40
PRINTED CIRCUIT DIAGRAMS ............................................................................................3-44
1. MAIN P.C.BOARD...................................................................................................................3-44
2. KEY P.C.BOARD.....................................................................................................................3-46
3. TIMER P.C.BOARD .................................................................................................................3-47
4. SMPS P.C.BOARD ..................................................................................................................3-48
3-2
ELECTRICAL TROUBLESHOOTING GUIDE
No 5V_A
No 5.2VA
Is 5.2VA section working?
Is 5.2V present at emitter of Q107?
Replace Q107.
Is there a DC voltage At (+) terminal of BD101?
Is there a DC voltage at R101?
Replace IC101.
Check F101
1. Power check flow
No VF+
Is 5.2VA section working?
Replace D102.
Check F102
NO
NO
YES
YES
YES
YES
Replace R101.
YES
Replace BD101.
YES
YES
A. B.
NO
NO
NO
NO
3-3
2. System operation flow
Power on
1.initializes SERVO, DSP and RISC registers
2.write RISC code to SDRAM
3.Reset RISC
Show LOGO
SLED at Inner Side?
SLED Moves to Inner Position
Tray Closed?
Tray Close to closed position
1.Judge whether have disc and disc type
2.Jump to related disc reading procedure
Received
Open/close key?
1.Execute Pressed Key and IR Key
2.System operation on routine loop
1.Stop playback and open tray
2.Display tray open message and LOGO
Receive
close key?
no
yes
no
yes
no
yes
no yes
3-4
3. Test & debug flow
Test
Check the AC Voltage
(110V or 220V)
Switch on the Power PCBA
Check the Power PART
Is
the DC Voltage
Outputs OK? (5.2V,5V,1.8V
,3.3V,8V,12V)
Check the Power PART
Is
3.3V, 1.8V,5V,12V and 8V outputs normal on main
PCB
Check the IC105 or diode
Connect to PC RS232 Cable and
Update the flash memory code
Update
Flash(IC502)
Successfully?
A
1.Check 27MHz system clock.
2.Check system reset circuit.
3.Check flash R/W enable signal PRD
4.Check RS232 Signals
5.Check flash memory related circuit
Replace flash(IC502)
Yes
yes
yes
Yes
No
No
No
No
3-5
Show LOGO
A
yes
Reset or Power on
Flash
Memory operates
Properly?
Check connection on lines between FLASH & M3355 and the FLASH access time whether is suitable or not.
SDRAM
works properly?
Check connection lines between SDRAM(IC503) & M3355 and the SDRAM is damaged.
M3355
VIDEO outputs
properly?
Check the related circuit of M3355. (IC501 PIN 2.3.7.8 check)
Have
TV signal output?
Does
Tray move inside
when it is not at closed
position?
Check the filtering and amp circuit of
TV signal .(IC604)
B
No No
YES
YES
YES
YES
No
NO
NO
Normal
TROUT & TRIN
signals?
NO
Check the load OPEN &
CLOSE switch
Normal
TRCLOSE &TROPEN
signal?
NO
Check the Tray control IO pins
on M3355.
Normal
LOAD+ & LOAD
signal
NO
Check the Tray control amplifying
circuit on Motor driver.(IC201)
Check the cable connection between
main PCBA and loader. (MECHA)
Check AV cable
connection to TV set
NO
YES
YES
YES
3-6
Does
the SLED move
to inner side when it is at
outer position
on?
B
Yes
Motor
Driver DRVSB
Pin is High?
Check the connection line of
DRVSB signal
Motor
Driver DRVSB
Pin is High?
Check the related circuit of
FOCUS.
SLED+
and SLED- output
properly ?
Check the amp circuit on
motor driver.
C
No
Check the cable connection
with MECHA.
Optical
Lens has movements
for searching
Focus?
Proper Focus outputs
to motor driver?
Check Focus connection on
M3355 and motor driver.
Proper F+
& F- outputs?
Check the amp circuit on
motor driver.
Check cable connect on with
pick-up head.
yes
No
Do not put in disc and tray
close.
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
3-7
Laser turns on when
reading disc?)
C
Yes
LD01 or LD02 output
properly?
Check the laser power circuit
on M3355 and connecting to
power transistor. (Q201, Q202)
Collector voltage of power transistor is OK?
( Q201, Q202)
Check the related circuit on
laser power TR
D
No
Yes
Check cable connection between
transistor output and pick-up head.
Check the RF connection between MD and M3355.
Put disc in?
Proper RF signal?
Laser off
Check the related circuit
on M3355 RF signal
Does spindle rotate?
Disc ID is correct?
Proper
Spindle signal on
M3355
Check spindle related
circuit on M3355
Proper RF signal?
Check the related circuit
on M3355 RF signal
Check the RF connection between MD and M3355.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
3-8
Focus ON OK?
D
Yes
Proper
signals on A, B, C,
D of M3355
Check the related circuit
on M3355 SBAD signal .
No
No
Check the related circuit
on M3355
.Proper SBAD signal
on M3355?
Check connections between
M3355 and pick-up head.
Track On OK?
Check cable connection on
pick-up head.
Proper tracking signal
on M3355?
Proper
M3355 track signal
on M3355?
Check the related
circuit on M3355
Check the track connection
on M3355 and motor driver.
Yes
No
E
. Proper FE signal
on M3355?
Check the related circuit
on M3355 FE signal
Disc is play?
T+ & T- output
properly?
Check the tracking control
amp circuit on motor driver.
Check RF signal waveform.
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
No
3-9
Normal
Audio output
when disc playback?
E
DAC received
correct data
stream?
Check connection between M3355
& Audio DAC. (Check DAC_RST#,
SER3, BCLK, LRCK,MCLK
Normal
Audio DAC
out? (IC601)
Check the related circuit of
Audio DAC. (Check Audio
out Pin 14, 15,18,19)
Check Audio filter, amplify, mute
circuit. (IC602 Application circuit)?
TEST END
Communications
between IR.VFD Front panel key
& M3355 & Front u-com(IC901)
is normally?
Check communication lines
on M3355.
Check the cable connection
on Front panel.
Yes
Normal
IR. VFD & Front
panel key
functions?
Yes
Yes
No
No No
NoNo
Yes
Yes
Yes
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