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SERVICE MANUAL MODELS : LH-C6230P/C6231P/LH-C6230S/LH-C6230W/LH-C6231W/LH-C6230X/LH-C6230Y/C6231Y

DVD/CD/VCR RECEIVER Home Cinema System

SERVICE MANUAL

P/N : 3829RDT033C

JULY, 2003

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)

CONTENTS
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

- 1-1 -

SECTION 1. GENERAL PART
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK. SUBJECT : X-RADIATION 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS. 2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALL THEM. 3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA TION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR. 4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCEDURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON EACH CUSTOMER S INVOICE. 5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES SIVE VOLTAGE. 6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED). SUBJECT: IMPLOSION 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT. 2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES. SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC. 3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V. S OF THE SAME OR LARGER SCREEN SIZE. 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

SAFETY CHECKS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP. 2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED. 3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES. 4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS. 5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED. 6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS. 7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. A.C. VOLTMETER

GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC

PLACE THIS PROBE ON EACH EXPOSED METAL PART

SUBJECT: GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED DANGEROUS VOLTAGE THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

- 1-2 -

NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact.

Storage in conductive bag

Drop impact

2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board. 3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched. 4) Laser beams may damage the eyes! Absolutely never permit laser beams to enter the eyes! Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

NEVER look directly at the laser beam, and don't let contact fingers or other exposed skin.

5) Cleaning the lens surface If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this.

Magnet

Pressure Pressure

How to hold the pick-up Cotton swab

Conductive Sheet

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 -

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 (1M) 6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband. 7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Armband

Resistor (1 Mohm) Resistor (1 Mohm) Conductive Sheet

- 1-4 -

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 precautions in this publications, always follow the safety precautions. 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 electrolytic 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 resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grouned-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified a anti-static can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

- 1-5 -

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.

- 1-6 -

SPECIFICATIONS
General
Power requirements Power consumption Dimensions (approx.) Mass (approx.) Operating temperature Timer Operating humidity AC230V ~ , 50 Hz 130 W 430 X 90 X 350 mm (w x h x d) 8 kg (17.6 lbs) 5ßC to 40ßC (41ßF to 104ßF ) 24-hour display type 5 % to 90 %

DVD Section
Laser Signal system Frequency response Semiconductor laser, wavelength 650 nm PAL/NTSC DVD (PCM 96 kHz): 8 Hz to 44 kHz DVD (PCM 48 kHz): 8 Hz to 20 kHz CD: 8 Hz to 20 kHz More than 65 dB (ANALOG OUT connectors only) Less than 1.0% More than 60 dB (DVD) More than 60 dB (CD) (Y) 1.0 V (p-p), 75 ohms, negative sync, Mini DIN 4-pin x 1 (C) 0.3 V (p-p) 75 ohms 4 heads helical scan azimuth system SP: 4 h (E-240 tape), LP: 8 h (E-240 tape) About 180 min (E-180 tape) 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) VIDEO: 1.0 V(p-p), 75 ohms, unbalanced VIDEO: More than 43 dB AUDIO: More than 72 dB (Hi-Fi) More than 42 dB (Mono) AUDIO: More than 85 dB

Signal-to-noise ratio Harmonic distortion Dynamic range Outputs S-VIDEO OUT

VCR Section
Head system Maximum recording time Rewind time Input level

Output level Signal-to-noise ratio

Dynamic range

Tuner Section
Tuning range Intermediate frequency FM: 87.5 - 108.0 MHz AM: 522 - 1611 kHz FM: 10.7 MHz AM: 450 kHz

Amplifier Section
Stereo mode Surround mode 20W + 20W (4 ohm at 1 kHz, THD 10%) 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%)

- 1-7 -

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

1 Way 1 Speaker 8 50 - 1,500 Hz 82 dB/W (1m) 40W 80W 160 x 350 x 325 mm 4.12 kg

- 1-8 -

SECTION 2. AUDIO PART

- 2-1 -

SECTION 3. VCR PART
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
Test Equipment a) OSCILLOSCOPE b) NTSC MODEL : NTSC SP TEST TAPE C) PAL MODEL : PAL SP TEST TAPE

Adjustment And Specification MODE
PLAY

MEASUREMENT POINT
V.Out H/SW(W373, W374)

ADJUSTMENT POINT
R/C TRK JIG KEY

SPECIFICATION
6.5 0.5H

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 distance (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
V.Out

OSCILLOSCOPE CH1 CH2 H/SW(W373,W374) R/C KEY

H/SW V.out (W373, W374)

WAVEFORM

H/SW

Composite VIDEO

- 3-1 -

VCR ELECTRICAL TROULBESHOOTING

- 3-2 -

- 3-3 -

2. SYSTEM/KEY CIRCUIT (1) AUTO STOP

Auto Stop YES Does the SW25 waveform appear at the IC501 Pin105? YES NO Do the T-UP Reel Pulses appear at the IC501 Pin49? YES Replace the IC501. Do T/UP Reel Pulses appear at the Q514 Base terminal ? YES Replace the T/UP Reel Sensor (RS501). NO Does 5.2V appear at the RS501? YES NO NO Check the Drum Motor signal.

Check the Power Circuit.

(2) The unstable loading of a Cassette tape
The unstable loading of a Cassette tape YES Is 12V applied to the PMC01 Pin8? YES Does the H signal appear at the IC501 Pin30 during inserting the CST ? YES Does the L signal appear at the IC501 Pin72 during inserting the CST? NO YES Check the Deck Mechanism. Check the IC501 Pins68, 69, 70, 71. Check the CST SW and the peripheral circuitry. NO Is 5.3V applied to the R544 ? YES NO NO Check the Power.

Refer to SMPS 5.3VA troubleshooting.

Caution : Auto stop can occur because Grease or Oil is dried up

- 3-4 -

3. SERVO CIRCUIT (1) Unstable Video in PB MODE
Unstable Video in PB Mode. YES Does the Noise level of the screen change periodically? YES Do the CTL pulses appear at the IC501 Pin8? YES Does the CFG waveform appear at the IC501 Pin9? YES On tracking do the CTL pulses move? YES Does the Video Envelope waveform appear at the IC501 Pin24? YES Replace the IC501. NO Refer to When the Y signal doesn t appear on the screen in PB Mode . NO Replace the IC501. NO Is adjusting the height of the CTL Head accurate? NO Readjust the height of the CTL Head.

Refer to (2) No 12VA of Power section Do the Drum PWM Pulses appear at the IC501 Pin107? YES Aren t the foil patterns and the Components between IC501 Pin107 and PMC01 Pin12 short? NO Do the DFG Pulses appear at the IC501 Pin104? NO YES Do the Drum PWM Pulses appear at the IC501 Pin107? YES Aren t the connecting patterns and the Components between IC501 Pin107 and PMC01 Pin12 short? NO Aren t the foil patterns and the Components between IC501 Pin104 and PMC01 Pin11 short? Replace the IC501. NO YES

(2) When the Drum Motor (2) doesn t run.
When the Drum Motor doesn t run,

Do the DFG Pulses appear at the PMC01 Pin11? NO Replace the Cap M.

Does 12V appear at the PMC01 Pin8? YES Does 2.8V appear at the PMC01 Pin12? YES Check the connector (PMC01) and the Drum Motor Ass y.

NO

- 3-5 -

(3) When the Capstan Motor doesn t run,

When the Capstan Motor doesn t run,

Does 12VA appear at the PMC01? YES Does 2.8V appear at the PMC01?

NO

Refer to SMPS(CAPSTAN/12Volt) Trouble Shooting .

NO YES Check the PMC01 and the Capstan Motor Ass y. YES NO Aren t the foil patterns and Components between IC501 Pin108 and PMC01 Pin9 short? YES NO Does the CFG signal come into the IC501 Pin9? NO YES Does the Capstan PWM signal appear at the IC501 Pin108? NO YES Aren t the foil patterns and Components between IC501 Pin108 and PMC01 Pin9 short? Replace the IC501. Aren t the foil patterns and component between IC501 Pin9 and PMC01 Pin1 short? Check the Capstan Motor Ass y. Does the CFG signal appear at the PMC01 Pin1? Does the PWM signal appear at the IC501 Pin108?

- 3-6 -

(4) KEY doesn t working

KEY doesn t working.

Is 5V applied to the IC501 Pin36? YES Does LED or FLD change when a function button is pressed?

NO

Refer to SMPS 5.3VA Trouble Shooting .

NO

Replace the defective switches.

- 3-7 -

4. Y/C CIRCUIT (1) No Video in EE Mode,

No Video in EE Mode

Does the Video signal appear at the IC301 Pin48? YES Is 5V applied to the IC301 Pins18, 24, 42, 55, 72, 91? YES Does the Video signal appear at the IC301 Pin65? YES Does the Video signal appear at the IC501 Pin19? YES Does the Video signal appear at the Emitter terminal of the Q307, Q308?

NO

Check the 24Pin of Tuner.

NO

Check the 5.2VT, 5.3VA Line. (Power Circuit)

NO

Is I2C BUS signal applied to the IC301 Pins68, 69? YES

NO

Check the System Circuit. (Refer to SYSTEM I2C BUS CHECK Trouble Shooting )

NO

Chck the path of the signal between the IC301 Pin65 and IC501 Pin17.

Check C316. (AGC)

YES

NO

Does the 12VT, 5.3VA NO appear at the Emitter terminal of the Q804, Q308. YES Replace the Q804, Q308.

Replace the IC301.

Check the 12VT, 5.3VA Line. (Power Circuit)

- 3-8 -

(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? YES Is the I2C Bus siganl applied NO to the IC301 Pins68, 69 ? YES Does the normal RF signal appear at the IC301 Pin78? NO Is the V.H.S/W signal applied to the IC301 Pin70? YES Is V.H.S/W H about 3.4V at the IC301 Pin70? YES YES Clean the Drum. NO Replace the IC301. NO Check the V.H.S/W level. (Check R303, R304) NO Check the System Circuit. (IC501 Pin105) Refer to SYSTEM I2C BUS CHECK Trouble Shooting . NO Check the line of the 5.2VT, 5.3VA Line. (Power Circuit)

Does the Y(Luminance) RF NO signal appear at the IC301 Pin76? YES Is the Y(Luminance) Video waveform showed up at theIC301 Pin43? YES Replace the IC301. NO

Check the path of the Y(Luminance) RF signal. (Check the C312)

YES

Check the path of the Y(Luminance) RF signal. (Check C327)

YES

- 3-9 -

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

- 3-10 -

(4) When the Video signal doesn t appear on the screen in REC Mode,
NO

Is the EE signal normal? YES Is 5.2VT/5.3VA applied to the IC301 Pins24,42,55,72,91? YES Does PB Mdoe operate normally? YES Does the RF signal appear at the IC301 Pin78? YES

Check EE Mode.

NO

Check the line of the 5.2VT/ 5.3VA Line.(Power Circuit)

NO

Check PB Mode.

NO

Is the REC H signal (about 4V) applied to the IC301 Pin80? YES Check REC Luminance Pass & Color Pass.

NO

Check the System of REC H . (the IC501 Pin47 / the D301)

YES

Replace the IC301.

Does the REC RF signal appear at the IC301 Pins88,89,94,95? YES Check the Drum & Drum Connector

NO

Check the circuit of the IC301 Pins85, 86.

YES

- 3-11 -

5. Hi-Fi CIRCUIT (A) No Sound(EE Mode)

No Sound. YES Check the TU Audio of IC801 Pins1, 3. NO Check the IC751 Pins30, 31.

Check the DVD Audio of IC801 Pins4, 5.

NO

Check the DVD MODULE. (P8D01 Pins3, 5).

Check the AV1 Audio of IC801 Pins6, 7.

NO

Check the Scart1 Jack. (SC901 Scart1 Audio in Pins2, 6).

Check the AV2 Audio of IC801 Pins8, 9.

NO

Check the Scart2 Jack. (SC901 Scart2 Audio in Pins2, 6).

Check the AV3 Audio of IC801 Pins10, 11.

NO

Check the front Jack. (PM602 Pins3, 5).

YES Check the Vcc of IC801 Pins34, 40, IC802 Pin4. YES Check the IIC Clock and DATA at IC801 Pins42, 43, IC802 Pins32, 33. YES NO Check the Audio of IC801 Pins16, 17. YES NO Check the Audio of IC802 Pins22, 26. YES Replace IC802. Replace IC801. NO Check the IC501 Pins59, 60. NO Check the Power 5.2V, 12VT.

Check the JK801.

- 3-12 -

(B) Hi-Fi Playback
PB mode YES No Sound. YES Check the Vcc of IC801 (Pins34, 40) YES NO Check Power 5.2V, 12VT.

NO Check the Hi-Fi Selection switch. (IC801 Pin41) and the Tape quality. YES Is the RF Envelope at IC801 Pin44 over 2Vp-p? YES Check IC801 Pin42(Data), Pin43(Clock) YES NO

Check IC501 Pin25 (A.H/SW)

NO

Check the parts of -COM (IC501 Pins59, 60)

NO Do Audio Signals appear at IC801 Pin16(L-CH), 17(R-CH)? YES NO Do Audio Signals appear at IC802 Pin10(L-CH), 16(R-CH)? YES Do Audio Signals appear at NO IC802 Pins22, 26? YES

Check the Connection at P3D01 Pins7, 9.

Check the A.IN line of IC802(C808, C809)

Check the Vcc of IC802 Pin4. YES Replace IC802.

NO

Check Power.

Do Audio Signals appear at JK801?

NO

Check the Jack(JK801)

- 3-13 -

(C)
Hi-Fi REC. YES It is impossible to record Hi-Fi Audio signal. YES Check Vcc of IC801.(Pins34, 40) YES Check IC801 Pin42(Data), Pin43(CLOCK). YES Do Audio signals appear at IC801 Pins16, 17? YES Do FM Audio signals appear at IC801 Pin36? YES Check the Contact Point of Drum Connector if good then Replace the Drum. NO Replace IC801. NO Check Audio input signal of IC801 Pins2, 3(TU.A.), 4, 5(DVD.A.), 6, 7(AVI.A.), 8, 9(AV2.A.), 10, 11(AV3.A.). NO Check ports of -COM. NO Check Power 5V, 12VT.

- 3-14 -

6. Tuner/IF CIRCUIT (A) No Picture on the TV screen
No picture on the TV screen YES Does the Video signal at the TU701 Pin24. YES

NO

Is +33V applied to TU701 Pin16? YES Is +5V applied to TU701 Pin13? YES Does the Clock signal appear at TU701 Pin11? YES Does the data signal appear at TU701 Pin12? YES Replace Tuner.

NO

Check 33V line.

NO

Check 5V line.

NO

Check the lIC Clock Signal of -COM Pin59.

NO

Check the lIC Data Signal of -COM Pin60.

Does Sync appear at IC501 Pin111. YES Does the Video signal at the IC501 Pin19. YES Does the Video signal at the IC301 Pin61. YES Does the Video signal at the IC802 Pin30.

NO

Check the signal flow from TU701 Pin24 to IC301 Pin48.

NO

Check the signal from IC301 Pin65 to IC501 Pin17.

NO

Check the signal from IC501 Pin19 to IC301 Pin56.

NO

Check the signal from IC501 Pin61 to IC802 Pin1.

Check the signal flow from IC802 Pin30 to SC901 Pin19.

- 3-15 -

(B) No Sound

No Sound. YES Check the Vcc of IC751 Pins1, 11, 19, 22, 33. YES Check the Tuner SiF signal at IC751 Pin2. YES Check the oscillator of IC751 Pins5, 6. YES Check the Audio of IC751 Pins30, 31. YES Check the Audio of IC801 Pins2, 3. YES Check the Audio of IC801 Pins16, 17. YES Check the Audio of IC802 Pins22, 26. YES Check the Signal flow from IC802 Pins22, 26, SC901 Pins1, 3. NO Check the signal flow from IC801 Pins16, 17 to IC802 Pins10, 16. NO Check the IIC Clock and Data at IC801 Pins42, 43. NO Check the signal flow from IC751 Pins30, 31 to IC801 Pins2, 3. NO Check the IIC Clock and Data at IC751 Pins12, 13. NO Replace X751 NO Check the Tuner SIF of TU701 Pin22. NO Check 5.2V Line.

- 3-16 -

SECTION 5. DVD PART
DVD ELECTRICAL TROUBLESHOOTING
1. Test & debug flow

- 5-1 -

- 5-2 -

- 5-3 -

- 5-4 -

- 5-5 -

- 5-6 -

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL
1) MT1379 main clock is at 27MHz(X501)

2) MT1336 reset is high active

- 5-7 -

3) RS232 waveform during procedure(Downloading)

4) Flash R/W enable signal during download(Downloading)

- 5-8 -

2. SDRAM CLOCK
1) MT1379 main clock is at 27MHz(X501)

3. TRAY OPEN/CLOSE SIGNAL
1) Tray open/close waveform

- 5-9 -

2) Tray close waveform

3) Tray open waveform

- 5-10 -

4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)

5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)

- 5-11 -

6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION)

7. DISC TYPE JUDGEMENT WAVEFORM

- 5-12 -

- 5-13 -

8. FOCUS ON WAVEFORM

- 5-14 -

9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)

- 5-15 -

10. TRACKING CONTROL RELATED SIGNAL(System checking)

- 5-16 -

11. RF WAVEFORM

12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF)

- 5-17 -

13. MT1379 VIDEO OUTPUT WAVEFORM
1) Full colorbar signal(CVBS)

2) Y

- 5-18 -

3) C

14. AUDIO OUTPUT FORM AUDIO DAC
1) Audio related Signal

- 5-19 -

MEMO

- 5-20 -

· SPEAKER
Satellite speaker
· MODEL: LHS-C6230T

853 862

854 852

861

851 A800

850

RUN DATE : 05.JUNE.2003
LOCA.NO 850 851 853 854 855 856 857 858 859 861 862 A800 PART NO 3701RM0042A 6400FTTC02A 3110RMP009A 6871RU4116B 6871RU9271A 6871RU9271B 6871RU9271C 6871RU9271D 6871RU9271E 353M025V 353M025W 6401RM0045A DESCRIPTION NET ASSEMBLY SPEAKER,FULLRANGE CASE PWB(PCB) ASSEMBLY,SUBSET(AUDIO PWB(PCB) ASSEMBLY,SUBSET(AUDIO PWB(PCB) ASSEMBLY,SUBSET(AUDIO PWB(PCB) ASSEMBLY,SUBSET(AUDIO PWB(PCB) ASSEMBLY,SUBSET(AUDIO PWB(PCB) ASSEMBLY,SUBSET(AUDIO SCREW,DRAWING SCREW,DRAWING SPEAKER ASSEMBLY SPECIFICATION SPK LHS-D6230T L.SILVER F30C-D366 TOPTONE FULL-RANGE(H REAR LH-6230TE MOLD STANDARD FE-3620TE 2P NEW TERMINAL 150M LHS-D6230T FRONT WIRE(5M) R CH LHS-D6230T FRONT WIRE(5M)/ L C LHS-D6230T CENTER WIRE(5M)/ (G LHS-D6230T REAR WIRE(10M) R/CH LHS-D6230T REAR WIRE(10M)/ L/C + 2 D3.0 L6.0 MSWR3/FZB + 2 D3.0 L14.0 MSWR3/FZB F30C-D384-2 SHIN POONG LHS-D62 REMARKS

- 7-3 -

Passive(Sub) Woofer
· MODEL: LHS-C6230W

852

861

854

855

853

851

RUN DATE : 05.JUNE.2003
LOCA.NO 851 852 853 854 855 861 PART NO 3720RMF045A 3701RM0043A 3091RMW050A 6400WTTJ03A 6871RU9271F 353M050C DESCRIPTION PANEL,FRONT NET ASSEMBLY CABINET ASSEMBLY SPEAKER,WOOFER PWB(PCB) ASSEMBLY,SUBSET(AUDIO SCREW SPECIFICATION FRONT LH-6230WE STANDARD SPK LHS-D6230W SILVER STANDARD ASSY LH-6230WE ALL PB 9T F65C-D365 TOPTONE WOOFER LHS-6 LHS-D6230W SUB WOOFER 2.5M, OR BH 3.5X16 FBK REMARKS

- 7-4 -

BLOCK DIAGRAM

2-2

2-3

AUDIO SHEMATIC DIAGRAMS
· U-COM SCHEMATIC DIAGRAM

2-4

2-5

· FUNCTION & POWER SCHEMATIC DIAGRAM

2-6

2-7

· MAIN AMP SCHEMATIC DIAGRAM

2-8

2-9

WIRING DIAGRAM

2-10

2-11

AUDIO VOLTAGE SHEET (IC&TR)
[FRONT]
LOC. IC501 PART LC87F57C PIN NUM. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 STOP 4.2 5 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 5 2.5 2.5 2.5 2.5 5 2.5 4.6 2.5 2.5 2.5 2 5 0 5 0 0 5 0 0 0 0 0 0 0 0 0 5 0.3 0.3 2.5 0 4.4 0.3 5 0.3 0.3 0 DVD PLAY 4.2 5 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 5 2.5 2.5 2.5 2.5 5 2.5 4.6 4.6 2.3 2.5 2.5 5 0 0 0 0 5 0 0 0 0 0 2.3 0 2.3 2.3 5 2.3 2.3 2.3 2.3 4.4 0 5 0.5 0 0 LOC. PART PIN NUM. 57 58 59 60 61 62 63 64 STOP 2.3 2.3 4.9 0 0 0 0 4 DVD PLAY 2.3 2.3 5 0 0 0 0 4

[MAIN]
LOC. IC707 PART KIA7805 PIN NUM. 1 2 3 1 2 3 1 2 -9 1 2 3 1 2 3 4 1 2 3 1 2 3 ANODE CATHODE ANODE CATHODE 1 2 3 4 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 10 STOP 11.9 0 5 18.4 0 11.9 0 -18.6 -9 18.4 0 9 18.4 12 0 5 11 0 5 11 0 5 -0.2 11 -0.2 11 -18.6 0 0 18.4 4.5 4.5 4.5 0 4.5 4.5 4.5 9 1.4 1.6 1.6 1.5 2.2 0 5 2.2 0 0 0 0 0 0 -4.5 0 0 0 DVD PLAY 11.9 0 5 18.4 0 11.9 0 -18.6 18.4 0 9 18.4 12 0 5 11 0 5 11 0 5 -0.2 11 -0.2 11 -18.6 0 0 18.4 4.5 4.5 4.5 0 4.5 4.5 4.5 9 1.4 1.6 1.6 1.5 2.2 0 5 2.2 0 0 0 0 0 0 -4.5 0 0 0 LOC. PIN NUM. 11 12 13 14 15 16 M60446AFP 5 30 42 TDA7265 1 2 3 4 5 6 7 8 9 10 11 TDA7265 1 2 3 4 5 6 7 8 9 10 11 TDA7265 1 2 3 4 5 6 7 8 9 10 11 TDA7265 1 2 3 4 5 6 7 8 9 10 11 PART STOP 0 0 0 0 0 4.5 5.2 -5.3 5 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 DVD PLAY 0 0 0 0 0 4.5 5.2 -5.3 5 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0

IC703

KIA7812

IC701

KIA7909 3 KA7809

IC105

IC702

IC200

IC704

KA78R12

IC706

KIA7805

IC705

KIA7805

IC250

D507 D511 BD501

D5402 D5402 KBU6G

IC101

KIA4580

IC300

IC102

CS5331A

IC400

IC103

4052

2-12

2-13

PRINTED CIRCUIT DIAGRAM
· MAINAMP & FRONT P.C. BOARD (SOLDER SIDE)

2-14

2-15

· MAINAMP & FRONT P.C. BOARD (COMPONENT SIDE)

2-16

2-17

· FUNCTION & POWER P.C. BOARD (SOLDER SIDE)

2-18

2-19

· FUNCTION & POWER P.C. BOARD (COMPONENT SIDE)

2-20

2-21

VCR SHEMATIC DIAGRAMS
· SYSTEM SCHEMATIC DIAGRAM

3-17

3-18

· A(AUDIO)/V(VIDEO) SCHEMATIC DIAGRAM

3-19

3-20

· POWER SCHEMATIC DIAGRAM

NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock.

NOTE: 1. Shaded(I) parts are critical for safety.Replace only with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.

3-21

3-22

· TU/IF. ACSS SCHEMATIC DIAGRAM

3-23

3-24

· HIFI/TUNER SCHEMATIC DIAGRAM

3-25

3-26

· A/V JACK, SCART SCHEMATIC DIAGRAM

3-27

3-28

VCR VOLTAGE SHEET (IC&TR)
IC501 STOP PLAY 0.9 4.85 0 0.1 0.1 0 0.1 0.1 0.3 0.68 0.02 0.02 0.02 3.8 0 4.47 0.15 4.77 4.77 4.06 4.05 0 0 0 4.84 4.77 0 0 0 0 2.5 4.19 4.23 0 1.48 1.48 4.29 2 2.11 0 0 0 0 2.1 2.2 0 1.3 0 0 0.9 0 1.5 4.7 0 2.17 0 4.85 0 0.1 0.1 0 0 0 0.9 0.85 3.19 0 0 3.8 2.3 0 0 2.38 2.38 0 0.1 4.85 4.82 0 0 2.5 0 0 0 0 2.6 4.17 4.17 0 1.5 1.4 4.7 2 2 0 0.1 0 0 2.2 2.2 0 1.2 0 0 2.3 0.2 2.3 4.7 1.9 2.7 IC301 STOP PLAY 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 4.7 0.99 0.99 1.85 1.54 0 2 2.4 0 2.4 1.7 2.8 4.7 0 4.03 2.15 1.46 2.13 1.7 2.13 4 2.13 2.35 2.8 2.77 2.1 2.17 0 1.72 0 0.84 2.15 0 4.69 4.72 2.11 2.84 2.8 3.79 0 2.11 0 4.18 4.18 0.68 2.17 2.17 2.17 2.17 2.19 2.2 0 2.2 2.2 2.2 4.67 0.98 0.96 1.76 0.36 0 2.44 2.47 0 3.33 2.55 3.09 4.7 0 0 2.2 1.8 2.1 2.24 2.13 4 2.13 2.35 3.1 2.82 2.1 2.66 0 1.23 0 0.83 2.15 0 4.67 4.7 2.94 3.65 4.23 3.77 2.29 2.1 4.7 4 4.8 0.8 IC801 STOP PLAY 0 0 9.12 2.48 4.8 0 1.76 0 0 0 0 2.5 1.72 2.5 4.76 2.52 0 0.56 2.52 2.52 2.52 2.52 0.17 2.02 0 2.02 2.02 0 3.33 0 2.52 4.72 2.35 2.35 0 4.76 4.76 4.76 4.76 4.6 2.52 2.52 2.54 2.54 0.57 4.76 2.5 1.75 3.78 0 1.79 1.22 3.81 9.12 6.22 0 2.53 9.06 2.48 4.79 2.08 0 2.2 0 0 2.5 2.66 2.5 4.74 2.52 0 0.39 2.66 2.66 2.66 2.66 0 2.07 0 2.07 2.07 0 0 2.84 2.84 3.56 4.71 2.33 0 0 4.74 4.74 4.74 2.33 0 2.64 2.61 2.65 2.65 0.41 4.74 0 2.62 0 0 0 0 0 9.06 0.22 IC302 STOP PLAY 1.78 0 2.85 0 2.8 4.73 2 0 2.78 0 2.84 0 2.83 4.71 2.02 0 IC501 STOP PLAY 0.9 0 0 0 2.5 4.6 4.3 4.4 0 1.1 4.7 4.7 4.7 4.7 4.2 4.8 4.8 4.4 0 4.7 0 0 4.5 4.6 0 0 3.3 4.4 0 1.3 0 3.5 0 0 0 2.3 0 0 2.3 2.3 0 0.6 4.7 0 0.6 2.2 0 0 0 2.3 4.5 4.3 0.1 0.1 0.8 4.75 4.75 3.8 4.7 4.1 4.76 4.76 4.4 0 0 2.4 2.4 4.4 4.6 3.2 0 3.3 0 0 1.2 1.2 2.18 0 0.19 1.25 2.35 2.35 0 2.32 2.32 2.34 0 4.69 4.77 0.8 IC301 STOP PLAY 0 3.07 4.43 0.35 0.65 1.07 0 3.72 0.97 1.66 1.66 1.66 1.66 4.7 0 0 1.65 1.65 1.65 0 2.19 4.72 2.19 0 2.19 0 2.36 0 0.29 0.19 2.23 0 3.7 1.23 0.72 0.72 0.72 4.62 4.68 0 0 1.65 1.65 1.65 0 0 4.7 2.18 0 2.18 IC801 STOP PLAY 2.96 2.16 4.53 2.54 3.81 3.13 3.86 3.8 2.45 3.84 4.03 3.85 3.85 0 0 0 3.85 3.85 0 3.85 3.15 0 4.45 0 4.45 0.23 2.1 0 2.53 0 0.22 0 0 0 0.29 0.3 0.3 0.3 0 0 0 0.3 0 2.49 0.2 0.2 0 4.33 0 4.32 IC302 STOP PLAY

MODE PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

MODE PIN NO. 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

3-29

3-30

PRINTED CIRCUIT DIAGRAMS
· TUNER P.C BOARD

3-31

3-32

· VCR P.C BOARD

3-33

3-34

· VCR P.C BOARD

3-35

3-36

DVD PART SCHEMATIC DIAGRAMS
· MPEG SCHEMATIC DIAGRAM

5-21

5-22

· SERVO SCHEMATIC DIAGRAM

5-23

5-24

· AUDIO SCHEMATIC DIAGRAM

5-25

5-26

· INTERFACE SCHEMATIC DIAGRAM

5-27

5-28

VOLTAGE SHEET (IC&TR)

5-29

5-30

PRINTED CIRCUIT DIAGRAM
· DVD P.C. BOARD(SOLDER SIDE)

5-31

5-32

· DVD P.C. BOARD (COMPONENT SIDE)

5-33

5-34

SECTION 7. EXPLODED VIEWS
· CABINET AND MAIN FRAME
A48 A00

NOTE) Refer to "SECTION 7 REPLACEMENT PARTS LIST" in order to look for the part number of each part.

A26

250

A45 265 285 A49

A46 300

A47

264 A42 320 A42B 260 321

267

A43

284 283

276

330 277

AUDIO TUNER

7-1

7-2

SECTION 4. MECHANSIM OF VCR PART

DECK MECHANISM PARTS LOCATIONS
Top View
Procedure Part Starting No. 1 Drum Assembly 2 Plate Top 2 2 3 Holder Assembly CST 4 Opener Door 5 Bracket Assembly L/D Motor
2 6 3 7 4 9 5 11 10 1 31 14 15 18 16 17 19 19 12

Fixing Type
3 Screw 2 Hook Chassis Hole Chassis Hole 3 Hook

Fig- Viure ew
A-1 A-2 A-2 A-2 A-2 T T T T T T T T T T T T T T T T T T T B B B B B B B B B

2,3,4 2,3,4,6

6 Gear Assembly Rack F/L 7 Arm Assembly F/L 8 Lever Assembly S/W 9 10 11 12 13 Arm Assembly Cleaner Head F/E Base Assembly A/C Head Brake Assembly T Brake Assembly RS

1 Hook, Chassis Hole A-2 Chassis Hole A-2 1 Hook A-2 Chassis Embossing Chassis Embossing 1 Screw 1 Hook 1 Hook 2 Hook A-3 A-3 A-3 A-4 A-4 A-4 A-4 A-5 A-5 A-5 A-5 A-6 A-6 A-6 A-6 A-7 A-7 A-7 A-7 A7

2,3 2,3

2,3 14 Arm Assembly Tension 2,3,12,13, 15 Reel S/Reel T 14 16 Base Assembly P4 17 Opener Lid 17 18 Arm Assembly Pinch 17 19 Lever T/Up / Arm T/Up 17,18 20 Belt Capstan/Motor Capstan 20, 21 21 22 23 24 25 26 Lever F/R Clutch Assembly D35 Brake Assembly Capstan Gear Drive/Gear Cam Gear Sector Plate Slider

Chassis Embossing Chassis Embossing Shaft 1 Hook 3 Screw Locking Tab Washer Locking Tab Washer/Hook 1 Hook Shaft Guide 1 Hook Locking Tab

8

33

13 15

Bottom View

20,21,23, 24,25 20,21,23,

27 Lever Tension

20 24 23 20 24 22 21

30 29 29 30 25 32 27 26 28

24,25,26 2,3,14,20, 28 Lever Spring 21,25,23, 24,26 25

29 Gear Assembly P2/Gear Assembly P3 Boss

A-8 A-8 A-9 A-9 A-9

B B T B T

2,3,14,25, 30 Base Assembly P2/Base Assembly P3 Chassis Slot 29 2,3,14,25, 31 Base Loading 1 Screw 29 2,3,14 32 Base Tension 2,3,20,21, 33 Arm Assembly Idler 22 Chassis Embossing Locking Tab

NOTE : When reassembly perform the procedure in the reverse order.
1) When reassembling, confirm Mechanism and Mode Switch Alignment Position (Refer to Page 4-13) 2) When disassembling, the Parts for Starting No. Should be removed first.

T:Top, B:Bottom

- 4-1 -

DECK MECHANISM DISASSEMBLY
(S2) (S2) (S3) Drum Motor Stator

(S3) Rotor

Drum Sub Assembly (A)

(Fig. A-1-1)
Drum FPC

Carbon Brush

(S1) (S1) (S1) H2

H1

Holder FPC

Fig. A-1 1. Drum Assembly (Fig. A-1-1)
1) Unplug the Drum FPC Connector. 2) Remove three Screws(S1) on bottom side and separate the Drum assembly. 3) Unhook (H1), (H2) and separate the Holder FPC and Cap FPC.

(Fig. B-1)

Cap FPC

1-1. Drum Motor
1) Remove two Screws(S2) and disassemble the Stator of the Drum Motor. 2) Remove two Screws(S3) and separate the Rotor of the Drum Motor from the Drum Sub assembly.
Drum FPC Holder FPC

NOTE
When reassembling, confirm (A) portion of the Drum Sub assembly whether the Carbon Brush is in there or not. Figure in the opposite direction

- 4-2 -

DECK MECHANISM DISASSEMBLY

Plate Top

(Fig. A-2-1)

(B') (B)

(C)

Holder Assembly CST

(Fig. A-2-2)

(E)

Arm Assembly F/L

(Fig. A-2-6)

Lever Assembly S/W (H8) Spring Lever S/W

(Fig. A-2-7)

(C1)

Bracket Assembly L/D Motor

(Fig. A-2-4)

(D)

(C')

(E')

Opener Door

(Fig. A-2-3)
(H6) Chassis (A) Gear Assembly Rack F/L (B)

(Fig. A-2-5)

Fig. A-2
- 4-3 -

DECK MECHANISM DISASSEMBLY
2. Plate Top (Fig. A-2-1)
1) Pull the (B) portion of the Plate Top back in direction of arrow and separate the right side of it. 2) pull the (B ) portion of the Plate Top back in direction of arrow and separate the left side of it. (Used tools : (-) type driver, anything tool with sharp point or flat point.) 2) Unhook three Hooks(H3, H4, H5) on bottom side of the Chassis, lift up the Bracket Assembly L/M and disassemble the Bracket Assembly L/D Motor.

(H4)

Bracket assembly L/M

NOTE
(1) When reassembling, push the Plate Top after alignment the two position(C), (C ) as below Fig.

(H3)

(H5)

(C') (C) (B') (B)

6. Gear Assembly Rack F/L (Fig. A-2-5)
1) Move the Gear Assembly Rack F/L in direction of arrow(A) and unhook the Hook(H6) pulling back in front. 2) Separate the Gear Rack F/L in direction of arrow(B).

NOTE
When reassembling, align the gear part of the Gear Assembly Rack F/L with the Gear Drive as below Fig.
Gear Rack F/L

3. Holder Assembly CST (Fig.A-2-2)
1) Move the Holder Assembly CST in direction of arrow and separate the left side of it first through the (D) position of the Chassis.
Holder assembly CST Chassis Gear Drive

(D)

7. Arm Assembly F/L (Fig. A-2-6)
1) Move the Arm Assembly F/L in direction of arrow and separate the left side of it first. 2) Disassemble the Arm Assembly F/L from each guided hole of the Chassis.

2) Disassemble the right side of the Holder Assembly CST from each guided hole of the Chassis.

8. Lever Assembly S/W(Fig. A-2-7)
1) Unhook the Hook(H8) in the left side of the Chassis and remove the Lever Assembly S/W.
Chassis

NOTE
When reassembling, insert the (E) part of the Holder Assembly CST in the (E ) hole of the Chassis first and assemble the left side of it.

4. Opener Door (Figure. A-2-3)
1) Turn the Opener Door clockwise and remove it through the guide hole of the Chassis.
(H8)

5. Bracket Assembly L/D Motor (Fig. A-2-4)
1) Unplug the Connector(C1).

- 4-4 -

DECK MECHANISM DISASSEMBLY

Arm Assembly Cleaner (Fig. A-3-1) (A)

(S4) (A) Base Assembly A/C Head

(Fig. A-3-3)

Head F/E (Fig. A-3-2)

Chassis

Fig. A-3 9. Arm Assembly Cleaner (Fig. A-3-1)
1) Breakaway the (A) portion as Fig. A-3-1 from the embossing of the Chassis, turn the Arm assembly Cleaner to clockwise direction and lift it up.

11. Base Assembly A/C Head (Fig. A-3-3)
1) Remove the Screw(S4) and lift the Base Assembly A/C Head up.

10. Head F/E (Fig. A-3-2)
1) Breakaway the (A) portion of the Head F/E from the embossing of the Chassis, turn it to counterclockwise direction and lift it up.

- 4-5 -

DECK MECHANISM DISASSEMBLY
Arm Assembly Tension

(Fig. A-4-3)
(H11) Spring TB Brake Assembly T

(Fig. A-4-1)
Spring Tension

Reel S

(Fig. A-4-4)

Reel T

(Fig. A-4-4)
Spring RS

Brake Assembly RS

(Fig. A-4-2)

(H12) (H9) (H10)

Base Tension

Chassis

Fig. A-4 12. Brake Assembly T (Fig. A-4-1)
1) Unhook the Spring TB from the Hook(H9) of the Chassis. 2) Lift the Brake Assembly T up.

NOTE
Difference for Springs

13. Brake Assembly RS (Fig. A-4-2)
1) Unhook the Spring RS from the Hook(H10) of the Chassis. 2) Lift the Brake Assembly T up.

Spring TB Color (Black) Spring RS Spring Tension

15. Reel S / Reel T (Fig. A-4-4)
1) Difference for Reel S / Reel T

14. Arm Assembly Tension (Fig. A-4-3)
1) Unhook the Spring Tension from the Hook(H11) of the Arm Assembly Tension. 2) Unhook the Hook(H12) of the Base Tension and lift the Arm Assembly Tension up.

Reel S

Reel T

- 4-6 -

DECK MECHANISM DISASSEMBLY

Opener Lid (B)

(Fig. A-5-2)

(B)

Arm Assembly Pinch

(Fig. A-5-3)
(C) Base Assembly P4 Lever T/up

(Fig. A-5-1)
(C) Arm T/up

(Fig. A-5-4)

(H13)

(H13)

(Fig. A-5-5)
(A)

Chassis

Fig. A-5 16. Base Assembly P4 (Fig. A-5-1)
1) Breakaway the (A) portion of the Base Assembly P4 from the embossing of the Chassis. 2) Turn the Base Assembly P4 to counterclockwise direction and lift it up.

NOTE
When reassembling, confirm the (C) portion of the Arm Assembly Pinch is inserted to the Chassis hole correctly as Fig.

17. Opener Lid (Fig. A-5-2)
1) Breakaway the (B) portion of the Opener Lid from the embossing of the Chassis. 2) Turn the Opener Lid to clockwise direction and lift it up.

19. Lever T/up (Fig. A-5-4)/ Arm T/up (Fig. A-5-5)
1) Unhook the Hook(H13) of the bottom Chassis and lift the Lever T/up up. 2) Lift the Arm T/up up.

18. Arm Assembly Pinch (Fig. A-5-3)
1) Lift the Arm Assembly Pinch up.

- 4-7 -

DECK MECHANISM DISASSEMBLY

Belt Capstan

(Fig. A-6-1)

Motor Capstan

(Fig. A-6-2)
Washer(W1)

Clutch Assembly D35 (L1) Brake Assembly Capstan

(Fig. A-6-4)
(L1)

(Fig. A-6-5)
Lever F/R

(Fig. A-6-3)
(L2)

Chassis

(S5)

Fig. A-6 20. Belt Capstan (Fig. A-6-1)/ Motor Capstan (Fig. A-6-2)
1) Remove the Belt Capstan. 2) Remove the three Screws(S5) on bottom Chassis and lift the Motor Capstan up.

22. Clutch Assembly D35 (Fig. A-6-4)
1) Remove the Washer(W1) and lift the Clutch Assembly D35 up.

21. Lever F/R (Fig. A-6-3)
1) Unlock the Locking Tab(L1) as Fig. A-6-3 and lift the Lever F/R up.

23. Brake Assembly Capstan (Fig. A-6-5)
1) Pull the Locking Tab(L2) back in direction of arrow and lift it up.

- 4-8 -

DECK MECHANISM DISASSEMBLY

(H14) Gear Cam Hole(B) Gear Drive Hole(A) Gear Cam

(Fig. A-7-2)
Washer (W2) Gear Sector

(Fig. A-7-3)
Gear Drive Plate Slider

(Fig. A-7-1)

(Fig. A-7-4)

(A)

Lever Tension

(Fig. A-7-5)
Lever spring (L3) Gear Drive Hole(C) Base Loading (H15)

(Fig. A-7-6)

(H16)

Chassis

Fig. A-7 24. Gear Drive (Fig. A-7-1)/ Gear Cam (Fig. A-7-2)
1) Remove the Washer(W2) and lift the Gear Drive up. 2) Unhook the Hook(H14) of the Gear Cam and lift the Gear Cam up.

26. Plate Slider (Fig. A-7-4)
1) Just lift the Plate Slider up.

27. Lever Tension (Fig. A-7-5)
1) Unhook the (A) portion of the Lever Tension from the Hook(H16) of the Chassis. 2) Turn the Lever Tension to counterclockwise direction and lift it up.

NOTE
When reassembling, align the Gear Drive Hole(A) and the Gear Cam Hole(B) in a straight line after the Gear Drive Hole(C) is aligned with the Chassis Hole as Fig.

28. Lever Spring (Fig. A-7-6)
1) Unlock the Locking Tab(L3) of the bottom Chassis and lift the Lever Spring up.

25. Gear Sector (Fig. A-7-3)
1) Unhook the Hook(H15) of the Base Loading on bottom Chassis and lift the Gear Sector up.

- 4-9 -

DECK MECHANISM DISASSEMBLY
Gear Assembly P2 Hole Gear Assembly P3 Hole

Gear Assembly P3

(Fig. A-8-2)

Lever Spring Boss

Gear Sector Hole(A) Gear Assembly P2 Plate Slider Hole(B)

(Fig. A-8-1)

(B)

(A)

Chassis

Base Assembly P3

(Fig. A-8-4)

Base Assembly P2

Fig. A-8 29. Gear Assembly P2 (Fig. A-8-1)/ Gear Assembly P3 (Fig. A-8-2)
1) Just lift the Gear Assembly P2 up. 2) Just lift the Gear Assembly P3 up.

(Fig. A-8-3)

30. Base Assembly P2 (Fig. A-8-3)/ Base Assembly P3 (Fig. A-8-4)
1) Move the Base Assembly P2 in direction of arrow(A) along the guide hole of the Chassis and disassemble it on bottom side. 2) Move the Base Assembly P3 in direction of arrow(B) along the guide hole of the Chassis and disassemble it on bottom side.

NOTE
When reassembling, align the two holes of the Gear Assembly P2 and P3 in a straight line after confirmation whether the Gear Sector Hole(A) and the Plate Slider Hole(B) are aligned or not as Fig.

- 4-10 -

DECK MECHANISM DISASSEMBLY
(S7) Base Loading

Base Tension

(Fig. A-9-2)
(A)

(Fig. A-9-1)

Arm Assembly Idler

(Fig. A-9-3)

(B)

(C)

(D)

Chassis

Fig. A-9 31. Base Loading (Fig. A-9-1)
1) Remove the Screw(S7). 2) Lift the Base Loading up.

33. Arm Assembly Idler (Fig. A-9-3)
1) Make narrower the two parts, (B) and (C), as Fig. A-9-3. 2) Lift the Arm assembly Idler up.

32. Base Tension (Fig. A-9-2)
1) Breakaway the (A) portion of the Base Tension from the embossing of the Chassis. 2) Turn the Base Tension to counterclockwise direction and lift it up.

NOTE
When disassembling, be careful not to be caught the (D) part by the Chassis as Fig.

- 4-11 -

- 4-12 -

DECK MECHANISM ADJUSTMENT
1. Mechanism Alignment Position Check
Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected.
Test Equipment/ Fixture Blank tape Test Conditions (Mechanism Condition) Eject Mode (with Cassette ejected) Check Point Mechanism and Mode Switch Position

1) Turn the Power S/W on and eject the Cassette by pressing the Eject Button. 2) Remove the Top Cover and Plate Assembly Top, visually check if the Gear Cam Hole is aligned with the Chassis Hole as below Fig. C-2. 3) IF not, rotate the Shaft of the Loading Motor to either clockwise or counterclockwise until the alignment is as below Fig. C-2.

4) Remove the Screw which fixes the Deck Mechanism and Main Frame and confirm if the Gear Cam is aligned with the Gear Drive as below Fig. C-1(A). 5) Confirm if the Mode S/W on the Main P.C.Board is aligned as below Fig. C-1(B). 6) Remount the Deck Mechanism on the Main P.C.Board and check each operation.

CHECK DIAGRAM

Gear Cam

Mode S/W

(A)

(B)

Gear Drive Gear Cam (o) and Gear Drive (o) groove alignment

BOTTOM VIEW Fig. C-1

L/D Motor Assembly

Gear Cam (A') (B) (A)

(B') Chassis Hole Gear Cam Hole Gear Drive Hole

TOP VIEW Fig. C-2

- 4-13 -

DECK MECHANISM ADJUSTMENT
2. Preparation for Adjustment (To set the Deck Mechanism of the loading state without inserting a cassette tape).
1) 2) 3) 4) Unplug the power cord from the AC outlet. Disassemble the Top Cover and Plate Assembly Top. Plug the power cord into the AC outlet. Turn the power S/W on and push the Lever Stopper of the Holder Assembly CST to the back for loading the cassette without tape. Cover the holes of the End Sensors at the both sides of the Chassis to prevent a light leak. Then the Deck Mechanism drives to the Stop Mode. In this case, the Deck Mechanism can accept inputs of each mode, however the Rewind and Review operation can not be performed for more than a few seconds because the Take-up Reel Table is in the Stop State and can not be detected the Reel Pulses.

3. Checking Torque
Purpose: To insure smooth transport of the tape during each mode of operation. If the tape transport is abnormal, then check the torque as indicated by the chart below.
Test Equipment/ Fixture
¥ Torque Gauge(600g/cm ATG) ¥ Torque Gauge Adaptor ¥ Cassette Torque Meter SRK-VHT-303

Test Conditions (Mechanism Condition)

Checking Method

¥ Play (FF) or Review (REW) Mode ¥ Perform each Deck Mechanism mode without inserting a cassette tape(Refer to above No.2 Preparation for Adjustment). ¥ Read the measurement of the Take-up or Supply Reels on the Cassette Torque Meter(Fig. C-3-2). ¥Attach the Torque Gauge Adaptor to the Torque Gauge and then read the value of it(Fig. C-3-1). Mode Test Equipment Cassette Torque Gauge Measurement Reel Take-Up Reel Measurement Values More than 400g/cm More than 400g/cm 40~100g/cm 120~210g/cm

Item Fast Forward Torque Rewind Torque Play Take-Up Torque Review Torque

Fast Forward Rewind Play Review

Cassette Torque Gauge Supply Reel Cassette Torque Meter Cassette Torque Meter Take-Up Reel Supply Reel

NOTE:
The values are measured by using a Torque Gauge and Torque Gauge Adaptor with the Torque Gauge affixed.

NOTE:
The torque reading to measure occurs when the tape abruptly changes direction from Fast Forward to Rewind Mode, when quick braking is applied to both Reels.

¥ Torque Gauge (600g.cm ATG)

¥ Cassette Torque Meter (SRK-VHT-303)

Torque Gauge
SR K

-V

HT

-S

300
250 200 150

Torque Gauge Adaptor

0 50

VID CAS EO S TOR ETTE Q MET UE VHT ER -303

SR

K
K - V H T 0T SR 50 100 150

200

300

250

Reel Table

Fig. C-3-1

Fig. C-3-2

- 4-14 -

DECK MECHANISM ADJUSTMENT
4.Guide Roller Height Adjustment
Purpose: To regulate the height of the tape so that the bottom of the tape runs along the tape guide line on the Lower Drum.
4-1. Preliminary Adjustment Test Equipment/ Fixture
Post Height Adjusting Driver

Test Conditions (Mechanism Condition)
Play or Review Mode

Adjustment Point
Guide Roller Height Adjustment screws on the Supply and Take-Up Guide Rollers.
Guide Roller Height Adjustment screw Upper Flange Guide Roller Retaining Screw

Adjustment Procedure
1) Confirm if the tape runs along the tape guide line of the Lower Drum. 2) If the tape runs the bottom of the guide line, turn the Guide Roller Height Adjustment Screw to clockwise direction. 3) If it runs the top, turn to counterclockwise direction. 4) Adjust the height of the Guide Roller to be guided to the guide line of the Lower Drum from the starting and ending point of the Drum.

ADJUSTMENT DIAGRAM

Fig. C-4-1

4-2. Precise Adjustment Test Equipment/Fixture
Oscilloscope Alignment Tape Post Height Adjusting Driver

Test Equipment Connection Points Test Conditions VCR(VCP) State
CH-1:PB RF Envelope CH-2:NTSC: SW 30Hz PAL: SW 25Hz Head Switching Output Point RF Envelope Output Point Play an Alignment Tape

Adjustment Point
Guide Roller Height Adjustment Screws

Waveform Diagrams
P2 POST ADJUSTMENT

Adjustment Procedure
1) Play an Alignment Tape after connecting the probe of the Oscilloscope to the RF Envelope Output Test Point and Head Switching Output Test Point. 2) Tracking Control(in PB Mode) : Center Position(When this adjustment is performed after the Drum Assembly has been replaced, set the Tracking Control so that the RF Output is Maximum). 3) Height Adjustment Screw : Flatten the RF waveform. (Fig. C-4-2) 4) Turn(Move) the Tracking Control(in PB Mode) clockwise and counterclockwise.(Fig. C-4-3) 5) Check that any drop of RF Output is uniform at the start and end of the waveform.

P3 POST ADJUSTMENT

Turn the Roller Guide Height Adjustment Screw slightly to flatten the waveform.

Fig. C-4-2

Tracking Control at center

Turn(Move) the Tracking Control to both directions

Fig. C-4-3 Connection Diagram
OSCILLOSCOPE

NOTE
If the adjustment is excessive or insufficient the tape will jam or fold.

RF ENVELOPE OUTPUT TEST POINT HEAD SWITCHING OUTPUT TEST POINT

- 4-15 -

DECK MECHANISM ADJUSTMENT
5. Audio/Control (A/C) Head Adjustment
Purpose: To insure that the tape passes accurately over the Audio and Control Tracks in exact alignment of the both Record and Playback Modes.
5-1. Preliminary Adjustment (Height and Tilt Adjustment) Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape. Test Equipment/ Fixture
Blank Tape Screw Driver(+) Type 5mm

Test Conditions (Mechanism Condition)
Play the blank tape

Adjustment Point
Tilt Adjustment Screw(C) Height Adjustment Screw(B) Azimuth Adjustment Screw(A)

Adjustment Procedure/Diagrams
1) Initially adjust the Base Assembly A/C Head as shown Fig. C-5-1 by using the Height Adjustment Screw(B). 2) Play a blank tape and observe if the tape passes accurately over the A/C Head without tape curling or folding. 3) If folding or curling is occured then adjust the Tilt Adjustment Screw(C) while the tape is running to resemble Fig. C-5-3. 4) Reconfirm the tape path after Playback about 4~5 seconds.

NOTE
Ideal A/C head height occurs when the tape runs between 0.2~0.25mm above the bottom edge of the A/C Head core.

A/C Head P4 Tape
10.9

Tape

0.2~0.25mm

A/C Head Base Fig. C-5-1
X-Value Adjustment Hole

Fig. C-5-3

Fixed Screw

Azimuth Adjustment Screw(A)

Tilt Adjustment Screw(C) Height Adjustment Screw(B)

A/C Head Assembly Fig. C-5-2

- 4-16 -

DECK MECHANISM ADJUSTMENT
5-2. Confirm that the tape passes smoothly between the Take-up Guide and Pinch Roller(using a mirror or the naked eye).
1) After completing Step 5-1.(Preliminary Adjustment), check that the tape passes around the Take-up Guide and Pinch Roller without folding or curling at the top or bottom. (1) If folding or curling is observed at the bottom of the Take-up Guide then slowly turn the Tilt Adjustment Screw(C) in the clockwise direction. (2) If folding or curling is observed at the top of it then slowly turn the Tilt Adjustment Screw(C) in the counterclockwise direction.

NOTE:
Check the RF envelope after adjusting the A/C Head, if the RF waveform differs from Fig. C-5-4, performs Precise Adjustment to flat the RF waveform.

5-3. Precise Adjustment (Azimuth adjustment)
Test Equipment/ Fixture Oscilloscope Alignment Tape(SP) Screw Driver(+) Type 5mm Connection Point Audio output jack Test Conditions (Mechanism Condition) Play an Alignment Tape 1KHz, 7KHz Sections Adjustment Point Azimuth Adjustment Screw(A) Height Adjustment Screw(B)

Adjustment Procedure
1) Connect the probe of the oscilloscope to Audio Output Jack. 2) Alternately adjust the Azimuth Adjustment Screw(A) and the Tilt Adjustment Screw(C) for maximum output of the 1KHz and 7KHz segments, while maintaining the flattest envelope differential between the two frequencies.

1KHZ

7KHZ

A:Maximum

B:Maximum

Fig. C-5-4

6. X-Value Adjustment
Purpose: To obtain compatibility with the other VCR(VCP) Models.
Test Equipment/ Fixture Oscilloscope Alignment Tape(SP only) Screw Driver(+) Type 5mm Connection Point CH-1: PB RF Envelope CH-2: NTSC: SW 30Hz PAL: SW 25Hz Head Switching Output Test Point RF Envelope Output Test Point Test Conditions (Mechanism Condition) Play an Alignment Tape
Left

Adjustment Point
Groove at the Base A/C

Right

Adjustment Procedure
1) Release the Automatic Tracking to run long enough for tracking to complete it s cycle. 2) Loosen the Fixed Mounting Screw and move the Base Assembly A/C Head in the direction as shown in the diagram to find the center of the peak that allows for the maximum waveform envelope. This method should allow the 31 m Head to be centrally located over the 58 m tape track. 3) Tighten the Base Assembly A/C Head mounting Screw.

Adjustment Diagram
X-Value Adjustment Hole

Fixed Screw
Azimuth Adjustment Screw(A) Tilt Adjustment Screw(C) Height Adjustment Screw(B)

OSCILLOSCOPE

Connection Diagram
RF ENVELOPE OUTPUT TEST POINT
CH-1 CH-2

HEAD SWITCHING OUTPUT TEST POINT

- 4-17 -

DECK MECHANISM ADJUSTMENT
7. Adjustment after Replacing Drum Assembly (Video Heads)
Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.
Test Equipment/ Fixture Oscilloscope Alignment Tapes Blank Tape Post Height Adjusting Driver Screw Driver(+) Type 5mm Connection Point CH-1: PB RF Envelope CH-2: NTSC