LG LH-CX640 Series User manual

DVD/VCR COMBI RECEIVER
Combi Receiver System
SERVICE MANUAL
MODELS :LH-CX245(LH-CX245X)/LH-CX246(LH-CX246X)
LH-CX247(LH-CX247X)/LH-CX640(LH-CX640X)
CAUTION
BEFORE SERVICINGTHEUNIT, READ THE \"SAFETY PRECAUTIONS\"
IN THIS MANUAL.
LH-CX640(LH-CX640X)LH-CX245(LH-CX245X)
LH-CX247(LH-CX247X) LH-CX246(LH-CX246X)
PROG./
PRESET PROG.

CONTENTS
SECTION 1....SUMMARY
SECTION 2 ....CABINET &MAIN CHASSIS
SECTION 3....ELECTRICAL
SECTION 4 ....MECHANISM OF VCR PART
SECTION5....MECHANISM OF DVD PART
SECTION 6....REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCTSAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS .............1-3
SERVICINGPRECAUTIONS
..................................................................................................1-4
\342\200\242
General Servicing Precautions
\342\200\242
Insulation Checking Prodedure
\342\200\242
Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM IC SETTING(VCR).......................................1-5
SERVICE INFORMATION FOR EEPROM (DVD) ...............................................................1-6
SPECIFICATIONS ......................................................................................................................1-7

1-3
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from LG Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire haz-
ard. These components are indicated by the letter \"x\" included in their compo-
nent designators and are required to maintain safe performance. No deviations
are allowed without prior approval by LG Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes
into the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer's approval. Unauthorized modi-
fications will not only void the warranty, but may lead to property damage or
user injury.
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to
alert the service personnel to important safety information in the
service literature.
The lightning flash with arrowhead symbol within an equilateral tri-
angle is intended to alert the service personnel to the presence of
noninsulated \"dangerous voltage\" that may be of sufficient magni-
tude to constitute arisk of electric shock.
The pictorial representation of afuse and its rating within an equi-
lateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.
After the original service problem has been corrected,make acheck of the fol-
lowing:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and
from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields,
strain reliefs, power supply cords, and other hardware have been reinstalled
per the original design. Be sure that the safety purpose of the polarized line
plug has not been defeated.
3. Soldering must be inspected to discover possiblecold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign par-
ticles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or aresistor rated
at 1watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After reassembly of the set, always perform an AC leakage test on all
exposed metallic parts of the cabinet (the channel selector knobs,antenna
terminals, handle and screws) to be sure that set is safe to operate without
danger of electrical shock. DO NOT USE ALINE ISOLATION TRANS-
FORMER DURING THIS TEST. Use an AC 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 150V AC type capacitor between a
known good earth ground water pipe, conduit, etc.) and the exposed metal-
lic parts, one at a time. Measure the ACvoltage across the combination of
1500 ohm resistor and .15 mfd capacitor. Reverse the ACplug by using a
non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75volts RMS.
This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiverin aclosed-in recess, cubbyhole, or closely fitting
shelf space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as:outdoor patio installations where
dew is afactor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must
follow the factory-approved mounting instructions. Aproduct 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 tests
on customized installations.
5. Caution customers against mounting aproduct on asloping shelf or in atilt-
ed position, unless the receiver is properly secured.
6. Aproduct on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll acart with small cast-
ers acrossthresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that aforest of
extensions, sprouting from asingle outlet, can lead to disastrous conse-
quencesto home and family.
A.C. Voltmeter
1500OHM
10 WATT
Place this probe
on each exposed
metal part.
Good Earth Ground
such as the Water
Pipe, Conduit, etc.
0.15uF
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-4
SERVICING PRECAUTIONS
CAUTION: Before servicing the HOME THEATER COMBI
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 pre-
cautions in this publications, always follow the safety pre-
cautions.
Remember Safety First:
General Servicing Precautions
1.Always unplug the HOME THEATER COMBIAC power
cord from the AC power source before:
(1)Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2)Disconnecting
or reconnecting any internal electrical
plug or other electrical connection.
(3)Connecting a test substitute in parallel with an elec-
trolytic capacitor.
Caution: Awrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.
2. Do not spray chemicals on or near this HOME THEATER
COMBI or any of its assemblies.
3. Unless specifiedotherwise in this service data, clean
electricalcontacts by applying an appropriate contact
cleaning solution to the contacts with apipe cleaner,
cotton-tipped swab, or comparablesoft 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 HOME THEATER COMBI
and/or any of its electrical assemblies unless all solid-state
device heat sinks are correctlyinstalled.
6.Always connect the test instrument ground lead to an
appropriate ground before connecting 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. Connectan insulation resistance meter (500V)
to the blades of the attachment plug. The insulation resis-
tance betweeneachbladeof the attachment plug and acces-
sibleconductive parts (Note 1) should be more than 1M-
ohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
ElectrostaticallySensitive(ES)Devices
Some semiconductor (solid state) devices can bedamaged
easily by static electricity. Such componentscommonly 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
incidenceof component damage caused by static electricity.
1. Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly,drain off any
electrostatic charge on your body by touching aknown
earth ground. Alternatively, obtain and wear acommer-
cially 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 aconductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Useonly agrounded-tip soldering iron to solder or unsolder
ESdevices.
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 ES
devices.
5. Do not use freon-propelled chemicals. These can
generate an electrical charge sufficient to damage ES
devices.
6.Do not remove areplacement ES devicefrom its protec-
tive package until immediately before you are ready to
install it. (Most replacement ES devices arepackagedwith
leads electrically shorted together by conductive foam,
aluminum foil,or comparable conductive material).
7. Immediately before removing the protective material from
the leads ofareplacement 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
replacementESdevices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from acarpeted floor can generate static elec-
tricity sufficient to damage an ES device.)

1-7
SPECIFICATIONS
General
Power requirements Refer to main label
Power consumption Refer to main label
Dimensions (approx.) 430 X81 X360 mm (w/h/d)
Mass (approx.) 5.8 kg
Operating temperature 5\313\232Cto 40\313\232C
(41\313\232F
to 95\313\232F)
Operating humidity 5%to90%
Timer 24hours display tape
DVD Section
Laser Semiconductor laser, wavelength 650 nm
Signal system PAL/NTSC
Frequency response DVD(PCM96kHz):8Hzto44kHz
DVD(PCM48kHz):8Hzto20kHz
CD:8Hzto20kHz
Signal-to-noise ratio More than 70 dB (analog out connectors only)
Harmonic distortion Less than 1.0%
Dynamic range Morethan 60 dB (DVD, CD)
Outputs
S-VIDEO OUT (Y) 1.0 V(p-p), 75 ohms, negative sync, Mini DIN 4-pin x1
(C) 0.3 V(p-p) 75 ohms
VCR Section
Tape speed PAL/MESECAM; 23.39 mm/s (SP), 16.69 mm/s (LP)
NTSC (Playback only); 35.35 mm/s (SP), 16.67 mm/s (LP),
11.12 mm/s (EP)
Maximum recording time SP: 4h(E-240 tape), LP: 8h(E-240 tape)
Rewind time About 180 min (E-180 tape)
Input level VIDEO:1.0 V(p-p), 75 ohms, unbalanced
AUDIO: -6.0 dBm, more than 10 kohms (SCART)
-6.0 dBm, more than 47 kohms (RCA)
Output level VIDEO:1.0 V(p-p),75ohms, unbalanced
Signal-to-noise ratio VIDEO: Morethan 43 dB
AUDIO: Morethan 72 dB (Hi-Fi)
More than 42 dB (Mono)
Dynamic range AUDIO: More than 85 dB
Tuner Section
Tuning range FM: 87.5 -108.0 MHz
AM: 522 -1611kHz
Intermediate frequency FM: 10.7 MHz
AM: 450 kHz
Amplifier(LH-CX245/LH-CX247)
Stereo mode 25W+25W(6ohmat1kHz,THD10%)
Surround mode Front: 25W +25W (THD 10%)
Centre: 25W
Surround:25W +25W (6ohm at 1kHz, THD 10%)
Subwoofer:60W (8 ohm at 30 Hz, THD 10%)
Speaker Section(LH-CX245/LH-CX247)
Satellite Speaker(LHS-CX245T/LHS-CX247T) Passive Speaker (LHS-CX245W/LHS-CX247W)
Type 1Way 1Speaker 1Way 1Speaker
Impedance 8\316\251 8\316\251
Frequency Response 130 -20,000 Hz 50 -1,500 Hz
Sound Pressure Level 85 dB/W (1m) 82 dB/W (1m)
Rated Input Power 25W 60W
Max Input Power 50W 120W
Net Dimensions (W x H x D) 90x138.5x100mm 160x350x345mm
Net Weight 0.9 kg 4.5 kg

1-8
Amplifier(LH-CX246)
Stereo mode 25W+25W(6ohmat1kHz,THD10%)
Surround mode Front: 25W +25W (THD10%)
Centre:25W
Surround: 25W +25W (6ohm at 1kHz, THD 10%)
Subwoofer:60W (8 ohm at 30 Hz, THD 10%)
Speaker Section(LH-CX246)
Satellite Speaker(LHS-CX246T) Passive Speaker (LHS-CX246W)
Type 1Way 1Speaker 1Way 1Speaker
Impedance 8\316\251 8\316\251
Frequency Response 130 -20,000 Hz 50 -1,500 Hz
Sound Pressure Level 85 dB/W (1m) 82 dB/W (1m)
Rated Input Power 25W 60W
Max Input Power 50W 120W
Net Dimensions (W xHxD) 89x130x114mm 160x350x333mm
Net Weight 0.54 kg 4.5 kg
Amplifier(LH-CX640)
Stereomode 90W+90W(6ohmat1kHz,THD10%)
Surround mode Front: 90W +90W (THD10%)
Centre:90W
Surround: 90W +90W(6ohm at 1kHz, THD 10%)
Subwoofer:150W(4ohm at 30 Hz, THD10%)
SpeakerSection(LH-CX640)
Satellite Speaker Centre speaker Passive Subwoofer
(LHS-CX640T) (LHS-CX640C) (LHS-CX640W)
Type 2Way 2Speaker 2Way 2Speaker 1Way 1Speaker
Impedance 6\316\251 6\316\251 4\316\251
Frequency Response 120 -20,000 Hz 120 -20,000 Hz 40 -1,500Hz
Sound Pressure Level 82 dB/W (1m) 82 dB/W (1m) 83dB/W (1m)
Rated Input Power 90W 90W 150W
Max Input Power 180W 180W 300W
Net Dimensions (W xHxD) 104x233x120mm 220x114x110mm 195x380x419mm
Net Weight 1.0 kg 1.0 kg 6.6 kg
\342\200\242
Design and specifications are subject to change without notice.
Manufactured under license from Dolby Laboratories.\"Dolby\" and the double-D symbol are trademarks of Dolby
Laboratories. Confidential unpublished works. Copyright 1992-1997 Dolby Laboratories.All rights reserved.
\"DTS\" and \"DTSDigital Surround\" are trademarks of Digital Theater Systems, Inc.

2-1
SECTION 2
CABINET &MAIN CHASSIS
CONTENTS
EXPLODED VIEWS .....................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Woofer Speaker Section (LHS-CX245W/LHS-CX247W) .......................................................2-3
3. Woofer Speaker Section (LHS-CX246W)..............................................................................2-4
4.Woofer Speaker Section (LHS-CX640W) ..............................................................................2-5
5. Setellite &Center Speaker Section (LHS-CX245T/LHS-CX247T) ........................................2-6
6. Setellite &Center Speaker Section (LHS-CX246T)...............................................................2-7
7. Setellite Speaker Section(LHS-CX640T)...............................................................................2-8
8.Center
Speaker
Section
(LHS-CX640C).................................................................................2-9
9. Packing Accessory Section ..................................................................................................2-10

2-2
EXPLODED VIEWS
1.CabinetandMain Frame Section
OPTIONAL PARTS
A
5
4
3
2
1
BCD

2-3
956
959
959 955
957
952
954
951
952
961
958
LOCA. NO. PART NO. DESCRIPTION SPECIFICATION
951 3720RMF085A PANEL,FRONT SPK LHS-D6245W MOLD STANDARD
952 4766RM0097A FELT INSIDE 65 MM, OUTSIDE 85MM,THI
953 3091RMW099A CABINET ASSEMBLY SPK LHS-D6245W STANDARD FINE
954 5208RM0056A DUCT SPK LHS-D6245W OTHER PAPER PIP
955 6400WTTJ03A SPEAKER,WOOFER F65C-D365TOPTONE WOOFER LHS-6
956 3701RM0104A NET ASSEMBLY SPK LHS-D6245W SP-8505
957 4766RM0005A FELT Audio WF,FE-3500SW,470X7X1T BL
959 353M050C SCREW,DRAWING BH 3.5X16 FBK
960 3610RM0046A FOOT SPK LHS-D6245W OTHER FOOT RUBB
961 6871RU9271F PWB(PCB) ASSEMBLY,SUBSET(AUDIO LHS-D6230W SUBWOOFER 2.5M, OR
2. Woofer Speaker Section (LHS-CX245W/LHS-CX247W)

2-4
956
959
959
955
953
961
960
952
951
LOCA.NO. PART NO DESCRIPTION SPECIFICATION REMARKS
951 3720RMF081A PANEL,FRONT SPK LHS-D6240W MOLD FRONT PANE
952 4766RM0084A FELT 1T BLACK EVA
953 3091RMW094D CABINET ASSEMBLY SPK LHS-D6240W CABINET ASSY
955 6400WTTJ03A SPEAKER,WOOFER CW-165B40LSAMMI WOOFER LHS-D6
956 4766RM0005A FELT Audio WF,FE-3500SW,470X7X1T BL
959 353M050C SCREW,DRAWING BH 3.5X16 FBK
960 3610RM0024A FOOT SPK LMS-230/530 OTHER (EVA) PH
961 6871RU9271F PWB(PCB) ASSEMBLY,SUBSET(AUDIO LHS-D6230W SUBWOOFER 2.5M, OR
3. Woofer Speaker Section (LHS-CX246W)

2-5
SAL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS
A900 6401RM0160A SPEAKER ASSEMBLY CW-210B150L-1 SAMMI LHS-C640W
950 5208RM0059A DUCT SPK LHS-T6540W MOLD CHROME PLA
951 3720RMM013A PANEL,AUDIO SPK LHS-T6540W MOLD FRONT (SIL
952 3701RM0110A NET ASSEMBLY SPK LHS-T6540W NET ASSY
953 6400WSMK03A SPEAKER,WOOFER CW-210B150L-1 SAMMI WOOFER 4O
954 3091RMW107A CABINET ASSEMBLY SPK LHS-T6540W CABINET ASSY
955 4766RM0110A FELT 63*115*2T BLACK DUCT EVA
956 6871RU9251A PWB(PCB) ASSEMBLY,SUBSET(AUDIO ASSY FE-5000WE ROUND 2P TERMIN
957 3610RM0009A FOOT LXS-330, EVA(BLACK) PHI15X1T,
952
953
954
956
955
951
950
A900
4. Woofer Speaker Section (LHS-CX640W)

2-6
850
851
862
852
862
860 853
861
854
861
5. Setellite &Center Speaker Section (LHS-CX245T/LHS-CX247T)
LOCA. NO. PART NO. DESCRIPTION SPECIFICATION
850 3701RM0103A NET ASSEMBLY SPK LHS-D6245T SP 8505
851 6400WTTC04A SPEAKER,FULLRANGE F30C-D366-2 TOPTONE WOOFER 6OH
852 4930RM0025A HOLDER AIR COVER LH-6230TE
853 3110RMP044A CASE LHS-D6245T MOLD STANDARD
854 6871RU4116B PWB(PCB) ASSEMBLY,SUBSET(AUDIO FE-3620TE 2P NEW TERMINAL 150M
860 353M025C SCREW,DRAWING TAPTITE, 3X10 FBK
861 353M025W SCREW,DRAWING +2D3.0 L14.0MSWR3/FZB
862 353M025V SCREW,DRAWING +2D3.0 L6.0MSWR3/FZB

2-7
850
851
860
852
854
861
853
6. Setellite&Center Speaker Section (LHS-CX246T)
LOCA.NO. PART NO DESCRIPTION SPECIFICATION REMARKS
850 3701RM0093A NET ASSEMBLY SPK LHS-D6240T SP-8505
851 6400WTTC04A SPEAKER,WOOFER MSF-80SB20L-1 SAMMI WOOFER 6OH
852 4930RM0046A HOLDER SPK LHS-D6240T MOLD PREVENTION
853 3110RMP042A CASE LHS-D6240T MOLD REAR CASE
854 6871RU4116B PWB(PCB) ASSEMBLY,SUBSET(AUDIO FE-3620TE 2P NEW TERMINAL 150M
860 353M025G SCREW,DRAWING TAPTITE, 3X10 FZMY
861 353M025H SCREW,DRAWING TAPTITE, 3X16 FZMY

2-8
A800
851
852
853
850
857 856
854
855
7.SetelliteSpeaker
Section
(LHS-CX640T)
SAL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS
A800 6401RM0158A SPEAKER ASSEMBLY MSF-90SB90L SAMMI LHS-C640T SV
850 3530RMP044A GRILLE LHS-E6740T PRESS BK 0.6T
851 3720RMM015A PANEL,AUDIO SPK LHS-E6740T/C MOLD FRONT
852 6400DSMX02A SPEAKER,TWEETER DT-11ND-1 SAMMI TWEETER(DOME)
853 6400WSMC05A SPEAKER,WOOFER MSF-90SB90L SAMMI WOOFER 6OHM
854 3110RMP073A CASE LHS-E6740T MOLD REAR
855 6871RU0038A PWB(PCB) ASSEMBLY,SUBSET(AUDIO LHS-C640/T6745/E740 STANDARD 2
856 3040RMP037A BASE LHS-E6740T MOLD BOTTOM STAND
857 3610RM0044A FOOT SPK LHS-T6540T/C OTHER EVA PHI

2-9
A700
752
750
751
753
756
754
755
756
8. Center Speaker Section (LHS-CX640C)
SAL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS
A700 6401RM0159A SPEAKER ASSEMBLY MSF-90SB90L SAMMI LHS-C640C SV
750 3530RMP044B GRILLE LHS-E6740C PRESS BK 0.6T
751 3720RMM015A PANEL,AUDIO SPK LHS-E6740T/C MOLD FRONT
752 6400DSMX02A SPEAKER,TWEETER DT-11ND-1 SAMMI TWEETER(DOME)
753 6400WSMC05A SPEAKER,WOOFER MSF-90SB90L SAMMI WOOFER 6OHM
754 3110RMP072A CASE LHS-E6740C MOLD REAR
755 6871RU0038A PWB(PCB) ASSEMBLY,SUBSET(AUDIO LHS-C640/T6745/E740 STANDARD 2
756 3040RMP036A BASE LHS-E6740C MOLD BOTTOM STAND
757 3610RM0044A FOOT SPK LHS-T6540T/C OTHER EVA PHI

2-10
BATTERY
CABLE, COAXIAL
CABLE SET ASS'Y,RF
OPTIONAL PARTS
INSTRUCTION ASSEMBLY
BOX
REMOCON
BAG
PACKING
PLUG ASS'Y 1WAY(YELLOW)
ANTENNA LOOP(AM)
ANTENNA (FM)
PLUG ASS'Y 2WAY
PACKING, CASING
PACKING, CASING
PACKING, CASING
810
811
812
824
825
826
801
802
806
CABLE, COAXIAL
822
808
900
804
803
803A
803B
803C
FILTER
9. Packing Accessory Section

3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM .............................3-2
VCR PART
ELECTRICAL ADJUSTMENT
PROCEDURES
...........................................................3-3
ELECTRICAL TROUBLESHOOTING
GUIDE ............................................................................3-4
1. POWER(SMPS)CIRCUIT.......................................3-4
2.SYSTEM/KEY CIRCUIT..........................................3-6
3. SERVO CIRCUIT ....................................................3-7
4.Y/C CIRCUIT .........................................................3-10
5. Hi-Fi CIRCUIT.......................................................3-14
6. TUNER/IF CIRCUIT ..............................................3-17
BLOCKDIAGRAMS ...............................................3-19
1. POWER(SMPS) BLOCK DIAGRAM 1.................3-19
2. POWER(SMPS) BLOCKDIAGRAM 2.................3-21
3. TU/IF, NICAM &A2 BLOCK DIAGRAM ..............3-23
4.VPS BLOCK DIAGRAM .......................................3-24
5. Y/C BLOCKDIAGRAM ........................................3-25
6. Hi-Fi BLOCK DIAGRAM ......................................3-27
7. SYSTEM BLOCK DIAGRAM ...............................3-29
CIRCUIT DIAGRAMS .............................................3-31
1. POWER(SMPS) CIRCUIT DIAGRAM 1_200W....3-31
2. POWER(SMPS)CIRCUITDIAGRAM 1_400W....3-33
3. POWER(SMPS) CIRCUIT DIAGRAM 2...............3-35
4. TU/IF, NICAM &A2 CIRCUIT DIAGRAM.............3-37
5. A/V CIRCUIT DIAGRAM.......................................3-39
6. HI-FI CIRCUIT DIAGRAM ....................................3-41
7. SCART(JACK)CIRCUITDIAGRAM ....................3-43
8. SYSTEM CIRCUIT DIAGRAM..............................3-45
9.TIMER CIRCUIT DIAGRAM_0TOOL ...................3-47
10. TIMER CIRCUIT DIAGRAM_5TOOL /7TOOL ..3-49
11.TIMER CIRCUIT DIAGRAM_6TOOL..................3-51
\342\200\242
WAVEFORM &VOLTAGE SHEET ........................3-53
\342\200\242
CIRCUIT VOLTAGE CHART ..................................3-55
PRINTED CIRCUITDIAGRAMS ........................3-59
1. MAIN P.C.BOARD ................................................3-59
2.KEY(LEFT) P.C.BOARD ......................................3-61
3. KEY(RIGHT) P.C.BOARD.....................................3-63
4. SMPSP.C.BOARD ..............................................3-65
DVD PART
ELECTRICAL TROUBLESHOOTING
GUIDE ..........................................................................3-67
1.SYSTEM OPERATION FLOW..............................3-67
2. SYSTEM TEST FLOW..........................................3-68
DETAILSAND WAVEFORMS ON SYSTEM
TEST AND DEBUGGING......................................3-74
1.SYSTEM 27MHZ CLOCK, RESET,
FLASH R/W SIGNAL............................................3-74
2. SDRAM CLOCK ...................................................3-76
3.TRAY OPEN/CLOSE SIGNAL..............................3-76
4. SLED CONTROLRELATED SIGNAL
(NO DISC CONDITION)........................................3-77
5. LENSCONTROL
RELATED SIGNAL
(NO DISC CONDITION)........................................3-77
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISCCONDITION)
..........................3-78
7.DISC TYPE JUDGEMENT WAVEFORM..............3-78
8. FOCUSONWAVEFORM .....................................3-80
9. SPINDLE CONTROL WAVEFORM
(NO DISC CONDITION)........................................3-81
10. TRACKING CONTROL RELATED
SIGNAL(SYSTEM CHECKING) .........................3-82
11.MT1389 AUDIO OPTICAL AND COAXIAL
OUTPUT(SPDIF)
.................................................3-83
12.MT1389 VIDEO OUTPUT WAVEFORM .............3-83
13. MT1389AUDIO OUTPUT TO AUDIO DAC .......3-84
14.AUDIO OUTPUT FROM AUDIO DAC................3-85
15.DVD &AMP WAVEFORMS................................3-86
BLOCK DIAGRAMS ...............................................3-87
1.OVERALL BLOCK DIAGRAM_200W..................3-87
2. OVERALL BLOCKDIAGRAM_400W..................3-88
3.SERVO BLOCK DIAGRAM..................................3-89
4. MPEG & MEMORY BLOCK DIAGRAM ...............3-90
5. VIDEO &AUDIO BLOCKDIAGRAM...................3-91
6.DVD &AMP BLOCK DIAGRAM..........................3-92
CIRCUITDIAGRAMS .............................................3-93
1. MPEG CIRCUIT DIAGRAM ..................................3-93
2. RF &SERVO CIRCUITDIAGRAM ......................3-95
3. AUDIO, \316\274_COM
CIRCUIT DIAGRAM(DVD &AMP) .......................3-97
4. DIGITAL AMP CIRCUIT DIAGRAM
(DVD &AMP)_200W............................................3-99
5.DIGITAL AMP CIRCUIT DIAGRAM
(DVD &AMP)_400W..........................................3-101
6.PWM &CODEIC CIRCUIT DIAGRAM
(DVD &AMP)_200W..........................................3-103
7.PWM &CODEIC CIRCUIT DIAGRAM
(DVD &AMP)_400W..........................................3-105
8.INTERFACE CIRCUIT DIAGRAM
(DVD &AMP)_200W ..........................................3-107
9.INTERFACE CIRCUIT DIAGRAM
(DVD &AMP)_400W ..........................................3-109
\342\200\242
CIRCUIT VOLTAGE CHART_200W .....................3-111
\342\200\242
CIRCUIT VOLTAGE CHART_200W.....................3-115
PRINTED CIRCUIT DIAGRAMS.......................3-119
1.DVD &AMP P.C.BOARD_200W ........................3-119
2. DVD &AMP P.C.BOARD_400W ........................3-121

3-2
OVERALL WIRING DIAGRAM
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10
11
12
CFG
12VA(CAP)
5.2VA
CAP
REV'H'I-LIMIT
MOTORGND
GND
12VA(DRUM)
CAPCTLL/M
CTL
DFG/PG
DRUM
CTL
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10
11
12
PMC01
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SPAPB
SPREC
SPBPB
LPRPB
LP
REC
LPAPB
Hi-FiAPB Hi-Fi
RECHi-FiBPB
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P3D01
12345678
GND
KEYRTN
1GND
F.A.R.IN
GND
F.A.L.IN
GND
VIDEO
IN
12345678 P6603P6602
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10
11
12
GND
SPDIF
GND
5.2VA
AMP-CLK
AMP-ENA
M-RESET
AMP-DATA
0AMPDATA
1A-MUTE
GND
OPTICAL
IN
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10
11
12
CN901
PVD04
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10
11
12
13
TUNED
STEREO
12VA
L-OUT
AGND
R-OUT
PLL-CE
PLL-DI
PLL-CLK
PLL-D0
DGND
RDS-CLK
RDS-DATA
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10
11
12
13
PN101PVD04
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10
11
12
13
14
15
GND
GND
5.3VA
5.3VA
GND
3.8VA
3.8VA
GND
13VA
GND
33VA
GND
-29VA
FD(-)
FD(+)
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10
11
12
13
14
15
PSV01PVS01
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10
11
12
DVD
ENA(M-REC)
A.GNDDVDDATA
OUT(RXDO)
DVDDATA
IN(TXDO)DVD
CLK(SCKO)
DVD
RESET(M-RESET)
AMPDATAIN AMP
CLK
GND
AMPENA AMPDATA
OUTA-MUTE'H'
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10
11
12
PMD01PDM01
123456
CTL(+)
CTL(-)
A/E(+)
A/E(-)
A.REC
A.PB
123456
P3D02
12
GND
FULL
ERASE
12 P3D03

3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. ServoAdjustment
1)PG Adjustment
\342\200\242
Test Equipment
\342\200\242
Adjustment And Specification
a) OSCILLOSCOPE b) PAL MODEL :PAL SP TEST TAPE
MODE
PLAY
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Adjustment Procedure
a) Insert the SP Test Tapeand play.
Note -Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the \"ATR\" is blink after the
SP Test Tapeis inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(W373, W374) and CH2 to the Video Out for the VCR.
c) Triggerthe mixedComboVideo Signal of CH2 to the CH1 H/SW(W373, W374), and then check the dis-
tance (time difference), which is from the selected A(B) Head point of the H/SW(W373, W374) signal to
the starting point of the verticalsynchronizedsignal,to 6.5H \302\261 0.5H (416\316\274s, 1H=64\316\274s).
\342\200\242
PG Adjustment Method
a-1) Payback the SP standard tape
b-2) Press the \"OK\" key on the Remote controller and the \"REC\" key on the Front Panel the same time,
then it goes in to Tracking initial mode.
c-3) Repeat the abovestep(No.b-2),
then it finishes the PG adjusting automatically.
d-4) Stopthe playback, then it goes out to PG adjusting mode after mony the PG data.
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CONNECTION
\342\200\242
WAVEFORM
V.Out
H/SW(W373, W374) 6.5 \302\261
0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
H/SW W373
W374
OSCILLOSCOPE
CH1CH2
V.outH/SW
(W373, W374)
H/SW
Composite
VIDEO
6.5H(416us)
VCR PART