LG LH-C6230P User manual

DVD/CD/VCR RECEIVER
Home Cinema System
SERVICE MANUAL
MODELS: LH-C6230P/C6231P (LGEDG/LGEES/LGEPT/LGEIS)
LH-C6230S (LGEFS/STUH) LH-C6230W (LGESA/LGEGF)
LH-C6231W (LGEAP) LH-C6230X (MOSCOW)
LH-C6230Y/C6231Y (LGEPL/LGEMK)
P/N : 3829RDT033C JULY, 2003
SERVICE MANUAL MODELS : LH-C6230P/C6231P/LH-C6230S/LH-C6230W/LH-C6231W/LH-C6230X/LH-C6230Y/C6231Y

- 1-1 -
SECTION 1. GENERAL
• PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRECAUTIONS ........................ 1-2
• SERVICING PRECAUTIONS........................................................................................................ 1-5
• ESD PRECAUTIONS ................................................................................................................... 1-6
• SPECIFICATIONS ....................................................................................................................... 1-7
SECTION 2. AUDIO PART
• AMP ELECTRICAL TROUBLESHOOTING GUDIE ..................................................................... 2-1
• BLOCK DIAGRAM......................................................................................................................... 2-2
• AUDIO SCHEMATIC DIAGRAMS ............................................................................................... 2-4
• WIRING DIAGRAM .................................................................................................................... 2-10
• AUDIO VOLTAGE SHEET (IC&TR) ............................................................................................ 2-12
• PRINTED CIRCUIT DIAGRAM ................................................................................................... 2-14
SECTION 3. VCR PART
• ELECTRICAL ADJUSTMENT PROCEDURES ............................................................................ 3-1
• VCR ELECTRICAL TROUBLESHOOTING................................................................................... 3-2
• VCR SHEMATIC DIAGRAMS ..................................................................................................... 3-17
• VCR VOLTAGE SHEET (IC&TR)................................................................................................ 3-29
• PRINTED CIRCUIT DIAGRAMS ................................................................................................. 3-31
SECTION 4. MECHANSIM OF VCR PART ....................................................................... 4-1
SECTION 5. DVD PART
• DVD ELECTRICAL TROUBLESHOOTING................................................................................... 5-1
• DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ...................................... 5-7
• DVD PART SCHEMATIC DIAGRAMS ........................................................................................ 5-21
• VOLTAGE SHEET (IC&TR) ........................................................................................................ 5-29
• PRINTED CIRCUIT DIAGRAM ................................................................................................... 5-31
SECTION 6. MECHANSIM OF DVD PART ....................................................................... 6-1
SECTION 7. EXPLODED VIEWS PART ........................................................................... 7-1
• Cabinet and Main frame ................................................................................................................ 7-1
• Speaker ........................................................................................................................................ 7-3
SECTION 8. REPLACEMENT PARTS LIST ..................................................................... 8-1
CONTENTS

- 1-2 -
SECTION 1. GENERAL PART
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-
TURER 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 PROTEC-
TION 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 CIR-
CUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-
NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN-
DLE 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. VOLT-
METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-
TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON-
DUIT, 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 MAG-
NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN-
GLE 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 PER-
SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-
TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-
TURE 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. OPERA-
TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-
TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-
CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-
ABLE 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 ORGA-
NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-
LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-
DURE. 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, CUBBY-
HOLE 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 RADIA-
TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-
ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-
CIAL 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 HAZ-
ARDS 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 SIN-
GLE 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

NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or
damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
5) Cleaning the lens surface
If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used
for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a
cotton swab should be used, taking care not to distort this.
6) Never attempt to disassemble the pick-up.
Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do
not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of
this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.
- 1-3 -
Storage in conductive bag Drop impact
NEVER look directly at the laser beam, and don’t let
contact fingers or other exposed skin.
Magnet
How to hold the pick-up
Pressure
Pressure
Cotton swab
Conductive Sheet

- 1-4 -
NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These
components are sensitive to, and easily affected by, static electricity. If such static electricity is high
voltage, components can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must
be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong
magnetism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit
2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)
4) To prevent AC leakage, the metal part of the soldering iron should be grounded.
5) Workers should be grounded by an armband (1MΩ)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static electricity changes in the clothing to escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Armband
Conductive
Sheet
Resistor
(1 Mohm)
Resistor
(1 Mohm)

- 1-5 -
SERVICING PRECAUTIONS
CAUTION : Before servicing the COMBI HOME THEATER
SYSTEM 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.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the COMBI HOME THEATER SYSTEM 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 COMBI HOME
THEATER SYSTEM 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 COMBI HOME THEATER
SYSTEM 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 resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1M-
ohm.
Note 1 : Accessible Conductive Parts including Metal pan-
els, 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 compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
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 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 elec-
tricity sufficient to damage an ES device.)

- 1-6 -
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive
surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are ready
to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER
SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can
generate static electricity sufficient to damage an ESD device).
CAUTION. GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL
TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF
UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO
CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO
ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY
INFORMATION IN SERVICE LITERATURE.

- 1-7 -
SPECIFICATIONS
General
Power requirements AC230V ~ , 50 Hz
Power consumption 130 W
Dimensions (approx.) 430 X 90 X 350 mm (w x h x d)
Mass (approx.) 8 kg (17.6 lbs)
Operating temperature 5ßC to 40ßC (41ßF to 104ßF )
Timer 24-hour display type
Operating humidity 5 % to 90 %
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 65 dB (ANALOG OUT connectors only)
Harmonic distortion Less than 1.0%
Dynamic range More than 60 dB (DVD)
More than 60 dB (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
Head system 4 heads helical scan azimuth system
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 Section
Stereo mode 20W + 20W (4 ohm at 1 kHz, THD 10%)
Surround mode Front: 20W + 20W (THD 10%)
Centre: 20W
Surround: 20W + 20W (4 ohm at 1 kHz, THD 10%)
Subwoofer: 40W (8 ohm at 30 Hz, THD 10%)

- 1-8 -
Speakers
Satellite (LHS-C6230T)
Type 1 Way 1 Speaker
Impedance 4‰
Frequency Response 130 - 20,000 Hz
Sound Pressure Level 83 dB/W (1m)
Rated Input Power 20W
Max Input Power 40W
Net Dimensions (W x H x D) 88 x 100 x 95 mm
Net Weight 0.54 kg
Passive Subwoofer (LHS-C6230W)
Type 1 Way 1 Speaker
Impedance 8‰
Frequency Response 50 - 1,500 Hz
Sound Pressure Level 82 dB/W (1m)
Rated Input Power 40W
Max Input Power 80W
Net Dimensions (W x H x D) 160 x 350 x 325 mm
Net Weight 4.12 kg

- 2-1 -
SECTION 2. AUDIO PART

- 3-1 -
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
Test Equipment
Adjustment And Specification
a) OSCILLOSCOPE
b) NTSC MODEL : NTSC SP TEST TAPE
C) 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 (416 s, 1H=64 s).
PG Adjustment Method
a-1) Payback the SP standard tape
b-2) Press the 1 key on the Remote controller and the PLAY key on the Front Panel the same time,
then it goes in to Tracking initial mode. (Note : PAL Model 1 key on Remote controller)
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) R/C TRK JIG KEY 6.5 –0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
H/SW(W373,W374)
OSCILLOSCOPE
CH1 CH2
V.out
H/SW
R/C KEY
(W373, W374)
H/SW
Composite
VIDEO
SECTION 3. VCR PART

- 3-2 -
VCR ELECTRICAL TROULBESHOOTING

- 3-3 -

- 3-4 -
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

- 3-5 -
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

- 3-6 -
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?
(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

- 3-7 -
(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

- 3-8 -
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 termi-
nal 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 termi-
nal 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

- 3-9 -
(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

- 3-10 -
(3) When the C(Color) 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 Color Rotary signal
applied to the IC301
Pin70?
Check the line of the 5.2VT/
5.3VA Line. (Power Circuit)
Replace the X301.
Check the Color Pass.
Check the Color Rotary
Circuit. (IC501 Pin99 )
Check the Color Rotary
level. (Check the R303)
Does the X301(4.43MHZ)
oscillate?
Replace the IC301.
Does the Color signal
appear at the IC301 Pin21?
Is Color Rotary H
about 3.4V?
Replace the IC301.
NO
NO
NO
YES
YES
YES
YES
NO NO
NO
YES
Does the Color signal
appear at the IC301
Pin25 ?