LG LHCX-245, LHCX-246, LHCX-247, LHCX-640-X Service 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 SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
LH-CX640(LH-CX640X) LH-CX245(LH-CX245X)
LH-CX247(LH-CX247X)
LH-CX246(LH-CX246X)
MODELS : LH-CX245(LH-CX245X)/LH-CX246(LH-CX246X)/LH-CX247(LH-CX247X)/LH-CX640(LH-CX640X)
SERVICE MANUAL
P/NO : 3829RGP015N DECEMBER, 2004
PROG./
PRESET
PROG.
CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . MECHANISM OF VCR PART
SECTION 5 . . . . MECHANISM OF DVD PART
SECTION 6 . . . . REPLACEMENT PARTS LIST
1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• 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 hazard. These components are indicated by the letter “x” included in their component 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 modifications 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 triangle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage” that may be of sufficient magnitude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equilateral 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 a check of the following:
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 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 or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or a resistor rated
at 1 watt 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 A LINE ISOLATION TRANSFORMER 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 metallic parts, one at a time. Measure the AC voltage across the combination of
1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a
non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75 volts RMS.
This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-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 a factor, 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. 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 tests
on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in 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 using 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.
0.15uF
1500 OHM
10 WATT
Place this probe
on each exposed
metal part.
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 precautions in this publications, always follow the safety precautions.
Remember Safety First:
General Servicing Precautions
1. Always unplug the HOME THEATER COMBI AC 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: 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 HOME THEATER
COMBI 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 HOME THEATER COMBI
and/or any of its electrical assemblies unless all solid-state
device heat sinks are correctly installed.
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. 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 include 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 grounded-tip soldering iron to solder or unsolder
ES 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 ES
devices.
5. Do not use freon-propelled chemicals. These can
generate an electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protective 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
SERVICE INFORMATION FOR EEPROM IC SETTING(VCR)
MODEL NAME HEX BINARY
LH-CX246 OPT1 38 00000000
OPT2 ED 00000000
OPT3 20 00000000
OPT4 8A 00000000
OPT5 41 00000000
OPT6 AF 00000000
LH-CX245 OPT1 38 00000000
OPT2 ED 00000000
OPT3 20 00000000
OPT4 8A 00000000
OPT5 41 00000000
OPT6 AF 00000000
LH-CX247 OPT1 38 00000000
OPT2 ED 00000000
OPT3 20 00000000
OPT4 8A 00000000
OPT5 41 00000000
OPT6 AF 00000000
LH-CX640 OPT1 38 00000000
OPT2 ED 00000000
OPT3 A0 00000000
OPT4 8A 00000000
OPT5 61 00000000
OPT6 AF 00000000
WR : OK I : EXIT MOVE :
F G
EDIT : DE
1. DETECT NEW EEPROM (OPTION EDIT
SCREEN)
- Eeprom EDIT screen automatically appears if
replacing Eeprom.
- Setup option data using the cursor Up/Down key
of a remote control.
(Setup upon BOM depending on OPT1~OPT6
model)
• Since an initial remote control is set to LG for LG
model, appropriately set optiona data using the
cursor Up/Down key.
2. EEPROM WRITED COMPLETE SCREEN
- Writes data on EEPROM by using REMOCON
"OK".
- If completing the option data screen with a menu
key, Powering Off is automatically done and the
option edit screen is arranged.
3. PG ADJUST
- Plays PAL SP TAPE for adjusting the AUTO PG.
- A 0:00:00 is played in the field if pressing the
front play with Remocon number "1" key played
during PAL SP.
- The 0:00:00 in the field represents position of the
TRACKING PRESET.
- "OFF" is displayed in the field if pressing the front
play key with the remocon number "1" in the status of the tracking preset pressed, and "ON" is
displayed in the field if AUTO PG operation is
automatically performed and completed.
- DECK STOP > plays if above operation is com-
pleted. Set operation is performed depending on
changed PG values. These values are stored in
the EEPROM area.
4. EEPROM INITIAL
- SETUP is displayed in the field if pressing the
FRONT REC KEY with the remocon number
"CLEAR" key pressed in the status of powering
Off.
- AUTO SEARCH is done since the initial screen
of ACMS is serviced if powering On.
- Check basic operation (PLAY/RECORD...)
EEPROM option code No. setting EEPROM option code No. setting procedure
NAME HEX BINARY
OPT1 00 00000000
OPT2 00 00000000
OPT3 00 00000000
OPT4 00 00000000
OPT5 00 00000000
OPT6 00 00000000
WR : OK I : EXIT MOVE : F G
EDIT : DE
MASKROM : R00
EEPROM : R00 LG CODE
1-6
SERVICE INFORMATION FOR EEPROM (DVD)
* OPTION
• NTSC model doesn’t have VCR option and use DVD option B~F as VCR option. (only DVD exist)
• PAL model has another separate VCR option. (Both VCR and DVD exist)
MODEL
NAME
LH-CX245
LH-CX246
LH-CX247
LH-CX640
00 F7 87 05 FC 22 00 00 00 0A 00 00 00 00 00 00
00 F7 87 05 FC 22 00 00 00 0A 00 00 00 00 00 00
00 F7 87 05 FC 22 00 00 00 0A 00 00 00 00 00 00
00F78705FCA200000000000000000000
OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT
123456789ABCDEFG
DETECT NEW EEPROM (OPTION EDIT SCREEN)
POWER ON
DVD LOGO Status (NO Disk status)
Remotecontrol
Pause key-->1-->4-->7-->2 in order.
Press number 0~9, Press charater
A~F (1~6 for a while)
Use arrow key (
F D G E
) to move
to approprite position and make
changes
Press pause key once
Change will be applied when power
OFF-->ON.
1-7
SPECIFICATIONS
General
Power requirements Refer to main label
Power consumption Refer to main label
Dimensions (approx.) 430 X 81 X 360 mm (w/h/d)
Mass (approx.) 5.8 kg
Operating temperature 5˚C to 40˚C (41˚F to 95˚F)
Operating humidity 5 % to 90 %
Timer 24 hours display tape
DVD Section
Laser Semiconductor laser, wavelength 650 nm
Signal system PAL/NTSC
Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz
DVD (PCM 48 kHz): 8 Hz to 20 kHz
CD: 8 Hz to 20 kHz
Signal-to-noise ratio More than 70 dB (analog out connectors only)
Harmonic distortion Less than 1.0%
Dynamic range More than 60 dB (DVD, CD)
Outputs
S-VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, Mini DIN 4-pin x 1
(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: 4 h (E-240 tape), LP: 8 h (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), 75 ohms, unbalanced
Signal-to-noise ratio VIDEO: More than 43 dB
AUDIO: More than 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 - 1611 kHz
Intermediate frequency FM: 10.7 MHz
AM: 450 kHz
Amplifier(LH-CX245/LH-CX247)
Stereo mode 25W + 25W (6 ohm at 1 kHz, THD 10%)
Surround mode Front: 25W + 25W (THD 10%)
Centre: 25W
Surround: 25W + 25W (6 ohm at 1 kHz, 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 1 Way 1 Speaker 1 Way 1 Speaker
Impedance 8 Ω 8 Ω
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) 90 x 138.5 x 100 mm 160 x 350 x 345 mm
Net Weight 0.9 kg 4.5 kg
1-8
Amplifier(LH-CX246)
Stereo mode 25W + 25W (6 ohm at 1 kHz, THD 10%)
Surround mode Front: 25W + 25W (THD 10%)
Centre: 25W
Surround: 25W + 25W (6 ohm at 1 kHz, THD 10%)
Subwoofer: 60W (8 ohm at 30 Hz, THD 10%)
Speaker Section(LH-CX246)
Satellite Speaker (LHS-CX246T) Passive Speaker (LHS-CX246W)
Type 1 Way 1 Speaker 1 Way 1 Speaker
Impedance 8 Ω 8 Ω
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) 89 x 130 x 114 mm 160 x 350 x 333 mm
Net Weight 0.54 kg 4.5 kg
Amplifier(LH-CX640)
Stereo mode 90W + 90W (6 ohm at 1 kHz, THD 10%)
Surround mode Front: 90W + 90W (THD 10%)
Centre: 90W
Surround: 90W + 90W (6 ohm at 1 kHz, THD 10%)
Subwoofer: 150W (4 ohm at 30 Hz, THD 10%)
Speaker Section(LH-CX640)
Satellite Speaker Centre speaker Passive Subwoofer
(LHS-CX640T) (LHS-CX640C) (LHS-CX640W)
Type 2 Way 2 Speaker 2 Way 2 Speaker 1 Way 1 Speaker
Impedance 6 Ω 6 Ω 4 Ω
Frequency Response 120 - 20,000 Hz 120 - 20,000 Hz 40 - 1,500 Hz
Sound Pressure Level 82 dB/W (1m) 82 dB/W (1m) 83 dB/W (1m)
Rated Input Power 90W 90W 150W
Max Input Power 180W 180W 300W
Net Dimensions (W x H x D) 104 x 233 x 120 mm 220 x 114 x 110 mm 195 x 380 x 419 mm
Net Weight 1.0 kg 1.0 kg 6.6 kg
• 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 “DTS Digital 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. Cabinet and Main Frame Section
A
5
4
3
2
1
BCD
467
251
467
300
OPTIONAL PARTS
252
A47
264
A44
262
266
261A
250
468
467
471
470
469
469
323
470
453
462
260
1
26
262
452
330
452
261A
452
261A
A46
275
A00
457
457
A26
276
322
274
A41
285
276B
467
289
280
A50
A43
284
283
286
277
287
288
2-3
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-D365 TOPTONE 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 SUB WOOFER 2.5M, OR
2. Woofer Speaker Section (LHS-CX245W/LHS-CX247W)
956
959
959
955
957
958
961
952
954
952
951
2-4
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-165B40L SAMMI 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 SUB WOOFER 2.5M, OR
3. Woofer Speaker Section (LHS-CX246W)
956
959
955
959
953
961
952
960
951
2-5
4. Woofer Speaker Section (LHS-CX640W)
952
953
955
951
954
A900
956
950
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 4 O
954 3091RMW107A CABINET ASSEMBLY SPK LHS-T6540W CABINET ASSY
955 4766RM0110A FELT 63*115*2T BLACK DUCT EV
956 6871RU9251A PWB(PCB) ASSEMBLY,SUBSET(AUDIO ASSY FE-5 000WE ROUND 2P TERMIN
957 3610RM0009A FOOT LXS-330, EVA(BLACK) PHI15X1T,
A
2-6
5. Setellite & Center Speaker Section (LHS-CX245T/LHS-CX247T)
861
850
862
851
852
862
860
854
861
853
LOCA. NO. PART NO. DESCRIPTION SPECIFICATION
850 3701RM0103A NET ASSEMBLY SPK LHS-D6245T SP 8505
851 6400WTTC04A SPEAKER,FULLRANGE F30C-D366-2 TOPTONE W OOFER 6OH
852 4930RM0025A HOLDER AIR CO
853 3110RMP044A CASE LHS-D6245T MOLD STAND
854 6871RU4116B PWB(PCB) ASSEMBLY,SUBSET(AUDIO FE-3620TE 2P NEW TERMINAL 150M
860 353M025C SCREW,DRAWING TAPTITE, 3X10 FBK
861 353M025W SCREW,DRAWING + 2 D3.0 L14.0 MSWR3/FZB
862 353M025V SCREW,DRAWING + 2 D3.0 L6.0 MSWR3/FZB
VER LH-6230TE
ARD
2-7
6. Setellite & Center Speaker Section (LHS-CX246T)
852
860
851
861
854
853
850
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
853 3110RMP042A CASE LHS-D6240T MOLD REAR CASE
854 6871RU4116B PWB(PCB) ASSEMBLY,SUBSET(AUDIO FE-3620TE 2P NEW
860 353M025G SCREW,DRAWING TAPTITE, 3X10 FZMY
861 353M025H SCREW,DRAWING TAPTITE, 3X16 FZMY
SPK LHS-D6240T MOLD PREVENTION
TERMINAL 150M
2-8
7. Setellite Speaker Section (LHS-CX640T)
852
853
A800
855
854
851
850
856
857
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 6 OHM
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
8. Center Speaker Section (LHS-CX640C)
A700
755
750
752
751
754
753
756
756
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 6 OHM
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
BLOCK DIAGRAMS ...............................................3-19
1. POWER(SMPS) BLOCK DIAGRAM 1 .................3-19
2. POWER(SMPS) BLOCK DIAGRAM 2 .................3-21
3. TU/IF, NICAM & A2 BLOCK DIAGRAM ..............3-23
4. VPS BLOCK DIAGRAM .......................................3-24
5. Y/C BLOCK DIAGRAM ........................................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) CIRCUIT DIAGRAM 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) CIRCUIT DIAGRAM....................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
• WAVEFORM & VOLTAGE SHEET ........................3-53
• CIRCUIT VOLTAGE CHART ..................................3-55
PRINTED CIRCUIT DIAGRAMS ........................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. SMPS P.C.BOARD ..............................................3-65
DVD PART
ELECTRICAL TROUBLESHOOTING
GUIDE
..........................................................................3-67
1. SYSTEM OPERATION FLOW..............................3-67
2. SYSTEM TEST FLOW..........................................3-68
DETAILS AND 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 CONTROL RELATED SIGNAL
(NO DISC CONDITION)........................................3-77
5. LENS CONTROL RELATED SIGNAL
(NO DISC CONDITION)........................................3-77
6. LASER POWER CONTROL RELATED
SIGNAL(NO DISC CONDITION) ..........................3-78
7. DISC TYPE JUDGEMENT WAVEFORM..............3-78
8. FOCUS ON WAVEFORM .....................................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. MT1389 AUDIO 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 BLOCK DIAGRAM_400W ..................3-88
3. SERVO BLOCK DIAGRAM ..................................3-89
4. MPEG & MEMORY BLOCK DIAGRAM...............3-90
5. VIDEO & AUDIO BLOCK DIAGRAM...................3-91
6. DVD & AMP BLOCK DIAGRAM ..........................3-92
CIRCUIT DIAGRAMS .............................................3-93
1. MPEG CIRCUIT DIAGRAM..................................3-93
2. RF & SERVO CIRCUIT DIAGRAM ......................3-95
3. AUDIO, µ_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
• CIRCUIT VOLTAGE CHART_200W .....................3-111
• 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
123456789
101112
KEY RTN 0
KEY RTN 1
5.3VA
VIDEO IN
GND
AUDIO "L" IN
GND
AUDIO "R" IN
GND
FD(-)
-29VA
FD(+)
123456789
101112
P6M01 PM601
123456789
101112
DVD VIDEO
A.GND
DVD A, 'L'
A.GND
DVD A, 'R'
A.GND
AUDIO 'L'
AUDIO 'R'
A.GND
DVD B
DVD G
DVD R
123456789
101112
PMD02 PDM02
123456789
10111213141516171819202122
23
VCC(HF)
RF
DVD-LD
DVD-PD
VOL(DVD)
GND
VC-INPUT
VCC
F
E
A
D
C
B
F(+)
T(-)
T(+)
F(-)
PICK-SEL
GND
CD-LD
CD-PD
VOL(CD)
123456789
10111213141516171819202122
23
PMD02
123456789
10
11
SPM+
SPM-
FM(+)
FM(-)
LM(-)
LM(+)
SW(OPEN)
SW(CLOSE)
GND
SW(LEAD IN)
GND
123456789
10
11
PMD03
123456789
10
32VA
32VA
GND
GND
5VA
GNDNCGND
NC
PWR SENSE
123456789
10
PSW01 PN901
1
2
3
4
5
6
7
8
9
10
11
12
CFG
12VA(CAP)
5.2VA
CAP REV 'H'
I-LIMIT
MOTOR GND
GND
12VA(DRUM)
CAP CTL
L/M CTL
DFG/PG
DRUM CTL
1
2
3
4
5
6
7
8
9
10
11
12
PMC01
1
2
3
4
5
6
7
8
9
SP A PB
SP REC
SP B PB
LP R PB
LP REC
LP A PB
Hi-Fi A PB
Hi-Fi REC
Hi-Fi B PB
1
2
3
4
5
6
7
8
9
P3D01
1
2
3
4
5
6
7
8
GND
KEY RTN 1
GND
F.A.R.IN
GND
F.A.L.IN
GND
VIDEO IN
1
2
3
4
5
6
7
8
P6603 P6602
1
2
3
4
5
6
7
8
9
10
11
12
GND
SPDIF
GND
5.2VA
AMP-CLK
AMP-ENA
M-RESET
AMP-DATA 0
AMP DATA 1
A-MUTE
GND
OPTICAL IN
1
2
3
4
5
6
7
8
9
10
11
12
CN901 PVD04
1
2
3
4
5
6
7
8
9
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
1
2
3
4
5
6
7
8
9
10
11
12
13
PN101 PVD04
1
2
3
4
5
6
7
8
9
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(+)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PSV01 PVS01
1
2
3
4
5
6
7
8
9
10
11
12
DVD ENA(M-REC)
A.GND
DVD DATA OUT(RXDO)
DVD DATA IN(TXDO)
DVD CLK(SCKO)
DVD RESET(M-RESET)
AMP DATA IN
AMP CLK
GND
AMP ENA
AMP DATA OUT
A-MUTE 'H'
1
2
3
4
5
6
7
8
9
10
11
12
PMD01 PDM01
1
2
3
4
5
6
CTL(+)
CTL(-)
A/E(+)
A/E(-)
A.REC
A.PB
1
2
3
4
5
6
P3D02
12GND
FULL ERASE
1
2
P3D03
1234567
REMOCON
GND
FLD CLK
FLD DATA
FLD ENV
VOLUMN DOWN
VOLUMN UP
1234567
P6M02 PM602
VCR
DECK
VCR MAIN
KEY BOARD
TIMER
BOARD
SMPS BOARD AMP BOARD
MD
AM/FM
TUNER
OPTION
MPEG BOARD
3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
• Adjustment And Specification
a) OSCILLOSCOPE b) PAL MODEL : PAL SP TEST TAPE
MODE
PLAY
• Adjustment Procedure
a) Insert the SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the
SP Test Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(W373, W374) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video 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 vertical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64µs).
• 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 above step(No.b-2), then it finishes the PG adjusting automatically.
d-4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data.
• CONNECTION
• WAVEFORM
V.Out
H/SW(W373, W374)
6.5 ± 0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
H/SW
W373
W374
OSCILLOSCOPE
CH1CH2
V.out
H/SW
(W373, W374)
H/SW
Composite
VIDEO
6.5H(416us)
VCR PART
3-4
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace the F101.
(Use the same Fuse)
Is the F101 normal?
Is the TH101
normal?
Is the BD101
normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace the
BD101.
Replace the TH101.
Is the D105
normal?
Check or Replace
the D105.
Replace the D129.
Replace the IC106.
Replace the D127.
Replace the D126.
Replace the D125.
Replace the D124.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is Vcc(12~28V) supplied to IC104 Pin3?
Is the D129 nor-
mal?
Is there about 2.5V
at the IC106 Vref?
Is the D127
normal?
Is the D126
normal?
Is the D125
normal?
Is the D124
normal?
Check the Main PCB
Power supply Line short?
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
NO 5.0VA.
Check or Replace
the D129.
Is there about 5.3V
at the Q168 Emitter?
Does the “H” signal
appear at the Q162?
Check or Replace
the Q162.
NO
Check the µ-com
PWRCTL ‘H’
NO
YES
YES
YES
(2) No 5.0VA
NO 3.3VA.
Check or Replace
the D127.
Is there about 3.8V
at the IC162 Pin1?
Check or Replace
the IC162.
NO
YES
YES
(3) No 3.3VA
NO 12VA.
Check or Replace
the D126.
Is there about 13V
at the Q161 C?
Check or Replace
the Q161.
NO
YES
YES
(4) No 12VA
NO
NO
NO
NO
NO
3-5
NO 32VA.
Replace the F101.
(use the same Fuse)
Is the F101 normal?
Is the TH101
normal?
Is the BD101
normal?
NO
NO
NO
Replace the BD101.
Replace the TH101.
NO
NO
NO
Is the D108
normal?
Check or Replace
the D108.
Replace the D122.
Replace the IC103.
YES
YES
YES
YES
YES
YES
YES
Is Vcc(12~23V) supplied to IC101 Pin3?
Is the D122
normal?
Is there about 2.5V
at the IC103?
Check the Woofer Main PCB
Power supply Line short or not?
(5) No 32VA
YES
3-6
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW25 waveform
appear at the IC501
Pin105?
Do the T-UP Reel Pulses
appear at the IC501 Pin49?
Is 12V applied to the
PMC01 Pin8?
Check the Drum Motor
signal.
Does 5.2V appear at the
RS501?
Check the Power Circuit.
Check the Power.
Is 5.3V applied to the
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins68, 69, 70, 71.
Do T/UP Reel Pulses
appear at the Q514
Base terminal ?
Replace the T/UP Reel
Sensor (RS501).
Check the CST SW and
the peripheral circuitry.
Replace the IC501.
The unstable loading of a
Cassette tape
Does the “H” signal appear
at the IC501 Pin30 during
inserting the CST ?
Does the “L” signal appear
at the IC501 Pin72 during
inserting the CST?
Check the Deck
Mechanism.
Caution :
Auto stop can occur because Grease or Oil is dried up
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO NO
YES
YES YES
3-7
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change
periodically?
Do the CTL pulses appear
at the IC501 Pin8?
Is adjusting the height of
the CTL Head accurate?
Readjust the height of the
CTL Head.
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at the IC501
Pin9?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin24?
Replace the IC501.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
(2) When the Drum Motor
(2) doesn’t run.
Do the DFG Pulses appear
at the PMC01 Pin11?
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin104 and PMC01
Pin11 short?
Replace the IC501.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin107?
Aren’t the foil patterns and
the Components between
IC501 Pin107 and PMC01
Pin12 short?
Do the DFG Pulses appear
at the IC501 Pin104?
Do the Drum PWM Pulses
appear at the IC501
Pin107?
Aren’t the connecting patterns and the Components
between IC501 Pin107 and PMC01 Pin12 short?
When the Drum Motor
doesn’t run,
Does 12V appear at the
PMC01 Pin8?
Does 2.8V appear at the
PMC01 Pin12?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
3-8
Does the CFG signal appear at the
PMC01 Pin1?
Does the PWM signal appear at the
IC501 Pin108?
Does 2.8V appear at the PMC01?
Check the PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
the IC501 Pin108?
Aren’t the foil patterns and Components
between IC501 Pin108 and PMC01
Pin9 short?
Does the CFG signal come into the
IC501 Pin9?
Aren’t the foil patterns and Components
between IC501 Pin108 and PMC01
Pin9 short?
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,
NO
NO
NO
YES
YES
YES
When the Capstan Motor doesn’t run,
Does 12VA appear at the PMC01?
YES
Replace the IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Aren’t the foil patterns and component
between IC501 Pin9 and PMC01
Pin1 short?
Check the Capstan Motor Ass’y.
NO
3-9
2. SERVO CIRCUIT
(4) KEY doesn’t working
KEY doesn’t working.
Is 5V applied to the IC501
Pin36?
Does LED or FLD change
when a function button is
pressed?
Refer to “SMPS 5.3VA
Trouble Shooting”.
Replace the defective
switches.
YES
NO
NO
3-10
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the 24Pin of Tuner.
Does the Video signal
appear at the IC301 Pin48?
Is 5V applied to the IC301
Pins18, 24, 42, 55, 72, 91?
Does the Video signal
appear at the IC301 Pin65?
Does the Video signal
appear at the IC501 Pin19?
Does the Video signal
appear at the Emitter terminal of the Q307, Q308?
Check the 5.2VT, 5.3VA
Line. (Power Circuit)
Is I2C BUS signal applied to
the IC301 Pins68, 69?
Check C316. (AGC)
Chck the path of the signal
between the IC301 Pin65
and IC501 Pin17.
Replace the IC301.
Does the 12VT, 5.3VA
appear at the Emitter terminal of the Q804, Q308.
Replace the Q804, Q308.
Check the 12VT, 5.3VA
Line. (Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
3-11
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5.2VT, 5.3VA applied to the
IC301 Pins24, 42, 55, 72, 91?
Is the I2C Bus siganl applied
to the IC301 Pins68, 69 ?
Does the normal RF signal
appear at the IC301 Pin78?
Check the line of the 5.2VT,
5.3VA Line. (Power Circuit)
Check the System Circuit.
(IC501 Pin105)
Check the V.H.S/W level.
(Check R303, R304)
Replace the IC301.
Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’.
Is the V.H.S/W signal
applied to the IC301 Pin70?
Is V.H.S/W “H” about 3.4V
at the IC301 Pin70?
Clean the Drum.
Check the path of the
Y(Luminance) RF signal.
(Check C327)
Check the path of the
Y(Luminance) RF signal.
(Check the C312)
Does the Y(Luminance) RF
signal appear at the IC301
Pin76?
Is the Y(Luminance) Video
waveform showed up at
theIC301 Pin43?
Replace the IC301.
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
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