GOLDSTAR XBS341 Service Manual

SERVICE MANUAL MODELS : XBS341

- 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)................................................................................................ 3-27

• PRINTED CIRCUIT DIAGRAMS................................................................................................. 3-29

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

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SECTION 1. GENERAL PART

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK.

SAFETY CHECKS

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

SUBJECT : FIRE & SHOCK HAZARD

1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

SUBJECT: GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED

DANGEROUS VOLTAGE THAT MAY BE OF SUFFICIENT 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 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 THATA FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. VOLTMETER

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

PLACE THIS PROBE ON EACH EXPOSED METAL PART

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

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)

- 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 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 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 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.)

- 1-6 -

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.

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 AC 120V, 60 Hz Power consumption 130W Dimensions (approx.) 430 X 90 X 350 mm (16.9 x 3.5 x 13.8 inches) (w x h x d) Weight (approx.) 8 kg (17.6 lbs) Operating temperature 5°C to 40°C (41°F to 104°F) Operating humidity 5 % to 90 % Signal system NTSC

Inputs

ANTENNA IN Antenna or CATV input, 75 ohms VHS VIDEO IN(LINE1,2) 1 Vp-p 75 ohms, sync negative, RCA jack x 2 VHS AUDIO IN(LINE1,2) -6.0 dBm more than 47 ohms, RCA jack (L,R) x 2

Outputs

MONITOR OUT 1 Vp-p 75 ohms, sync negative S-VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync, Mini DIN 4-pin x 1

Component Video output (Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1

(Pb)/(Pr) 0.7 V (p-p) 75 ohms, RCA jack x 1

VCR Specifications

Head system Four head helical scan azimuth system Timer 12-hour display type with AM, PM Tape speed SP: 33.35 mm/sec, LP: 16.67 mm/sec, SLP: 11.12 mm/sec Tape width 12.7 mm Maximum recording time (SP: 2 HOURS (T-120), SLP: 6 HOURS (T-120)/

8 HOURS (T-160) Rewind time About 3 minutes (T-120) Antenna 75 ohms (VHF/UHF) VHF output signal Channel 3 or 4 Channel coverage VHF: 2-13, UHF: 14-69, CATV: 1-125

(4A, A-W, W+1 - W+84, A-5 - A-1) Frequency range 200Hz to 8kHz Signal-to-noise ratio More than 65 dB (EE mode) Dynamic range More than 70 dB (EE mode) Channel separation More than 45 dB (EE mode)

DVD Specifications

Laser system Semicondustor laser, wavelength 650 nm Frequency reponse DVD (PCM 96 kHz): 8Hz to 44 kHz, DVD (PCM 48 kHz): 8Hz to 22kHz

CD:200Hz to 18kHz Signal-to-noise ratio More than 70 dB Harmonic distortion Less than 0.5% Dynamic range More than 65 dB (DVD/CD)

Tuner section

System PLL qurtz-locked digital synthesizer system Tuning range 87.5~108.0MHz (FM)

530~1720KHz (AM) Antena Wire antenna (FM)

Loop antenna (AM)

- 1-8 -

Speakers

Satellite (LHS-C6235T)

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-C6235W)

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

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

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

(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.

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,

YES

When the Capstan Motor doesn t run,

Does 12VA appear at the PMC01?

YES

Replace the IC501.

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.

- 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

- 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 terminal of the Q307, Q308?

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

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

Check C316. (AGC)

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

Replace the IC301.

Does the 12VT, 5.3VA appear at the Emitter terminal of the Q804, Q308.

Replace the Q804, Q308.

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

Check the System Circuit. (Refer to SYSTEM I

C BUS

CHECK Trouble Shooting )

YES

- 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.

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.

YES

Does the Color signal appear at the IC301 Pin25 ?

- 3-11 -

(4) When the Video signal doesn t appear on the screen in REC Mode,

Is the EE signal normal?

Is 5.2VT/5.3VA applied to the IC301 Pins24,42,55,72,91?

Does the RF signal appear at the IC301 Pin78?

Check EE Mode.

Check the System of REC

H . (the IC501 Pin47

/ the D301)

Replace the IC301.

Check the line of the 5.2VT/

5.3VA Line.(Power Circuit)

Check PB Mode.

Is the REC H signal (about 4V) applied to the IC301 Pin80?

Check the circuit of the IC301 Pins85, 86.

Check REC Luminance Pass & Color Pass.

Does PB Mdoe operate normally?

Does the REC RF signal appear at the IC301 Pins88,89,94,95?

Check the Drum & Drum Connector

YES

- 3-12 -

5. Hi-Fi CIRCUIT

(A) No Sound(EE Mode)

YES

No Sound.

Check the TU Audio of IC801 Pins1, 3.

Check the DVD Audio of IC801 Pins4, 5.

Check the AV1 Audio of IC801 Pins6, 7.

Check the AV2 Audio of IC801 Pins8, 9.

Check the AV3 Audio of IC801 Pins10, 11.

Check the Vcc of IC801 Pins34, 40, IC802 Pin4.

YES

Check the IIC Clock and DATA at IC801 Pins42, 43, IC802 Pins32, 33.

YES

Check the Audio of IC801 Pins16, 17.

YES

Check the Audio of IC802 Pins22, 26.

YES

Check the JK801.

Check the IC751 Pins30, 31.

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

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

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

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

Check the Power 5.2V, 12VT.

YES

Check the IC501 Pins59, 60.

Replace IC801.

Replace IC802.

- 3-13 -

(B) Hi-Fi Playback

YES

PB mode

No Sound.

Check the Vcc of IC801 (Pins34, 40)

Check the Hi-Fi Selection switch. (IC801 Pin41) and the Tape quality.

Is the RF Envelope at IC801 Pin44 over 2Vp-p?

YES

Check IC801 Pin42(Data), Pin43(Clock)

YES

Do Audio Signals appear at IC801 Pin16(L-CH), 17(R-CH)?

YES

Do Audio Signals appear at IC802 Pin10(L-CH), 16(R-CH)?

YES

YES YES

Do Audio Signals appear at IC802 Pins22, 26?

Do Audio Signals appear at JK801?

Check Power 5.2V, 12VT.

Check IC501 Pin25 (A.H/SW)

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

Check the Connection at P3D01 Pins7, 9.

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

Check the Vcc of IC802 Pin4.

Replace IC802.

Check the Jack(JK801)

Check Power.

- 3-14 -

(C)

Hi-Fi REC.

It is impossible to record Hi-Fi Audio signal.

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.

YES

Check Power 5V, 12VT.

Check ports of -COM.

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.).

Replace IC801.

- 3-15 -

6. Tuner/IF CIRCUIT

(A) No Picture on the TV screen

No picture on the TV screen

Does the Video signal at the TU701 Pin24.

YES

Is +33V applied to TU701 Pin16?

YES

Is +5V applied to TU701 Pin13?

Does Sync appear at IC501 Pin111.

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.

Check the signal flow from IC802 Pin30 to SC901 Pin19.

YES

Check 33V line.

Check 5V line.

YES

Does the Clock signal appear at TU701 Pin11?

Check the lIC Clock Signal of -COM Pin59.

YES

Does the data signal appear at TU701 Pin12?

Replace Tuner.

Check the signal flow from TU701 Pin24 to IC301 Pin48.

Check the signal from IC301 Pin65 to IC501 Pin17.

Check the signal from IC501 Pin19 to IC301 Pin56.

Check the signal from IC501 Pin61 to IC802 Pin1.

Check the lIC Data Signal of -COM Pin60.

- 3-16 -

(B) No Sound

No Sound.

Check the Vcc of IC751 Pins1, 11, 19, 22, 33.

YES

Check 5.2V Line.

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.

YES

Check the Tuner SIF of TU701 Pin22.

Replace X751

Check the IIC Clock and Data at IC751 Pins12, 13.

Check the signal flow from IC751 Pins30, 31 to IC801 Pins2, 3.

Check the IIC Clock and Data at IC801 Pins42, 43.

Check the signal flow from IC801 Pins16, 17 to IC802 Pins10, 16.

SECTION 4. MECHANSIM OF VCR PART

- 4-1 -

DECK MECHANISM PARTS LOCATIONS

9 5

18 16

19 12

Top View

Bottom View

20 24

23 20

29 30

25 32 27 26 28

NOTE : When reassembly perform the

procedure in the reverse order.

1 Drum Assembly 3 Screw A-1 T

2 Plate Top 2 Hook A-2 T 2 3 Holder Assembly CST Chassis Hole A-2 T 2 4 Opener Door Chassis Hole A-2 T

5 Bracket Assembly 3 Hook A-2 T

L/D Motor 2,3,4 6 Gear Assembly Rack F/L 1 Hook, Chassis Hole A-2 T 2,3,4,6 7 Arm Assembly F/L Chassis Hole A-2 T

8 Lever Assembly S/W 1 Hook A-2 T

9 Arm Assembly Cleaner Chassis Embossing A-3 T 10 Head F/E Chassis Embossing A-3 T 11 Base Assembly A/C Head 1 Screw A-3 T

2,3 12 Brake Assembly T 1 Hook A-4 T 2,3 13 Brake Assembly RS 1 Hook A-4 T 2,3 14 Arm Assembly Tension 2 Hook A-4 T 2,3,12,13, 15 Reel S/Reel T A-4 T 14

16 Base Assembly P4 Chassis Embossing A-5 T 17 Opener Lid Chassis Embossing A-5 T

17 18 Arm Assembly Pinch Shaft A-5 T 17 19 Lever T/Up / Arm T/Up 1 Hook A-5 T 17,18 20

Belt Capstan/Motor Capstan

3 Screw A-6 B

21 Lever F/R Locking Tab A-6 B

20, 21 22 Clutch Assembly D35 Washer A-6 B

23 Brake Assembly Capstan Locking Tab A-6 B 24 Gear Drive/Gear Cam Washer/Hook A-7 B 25 Gear Sector 1 Hook A-7 B

20,21,23, 26 Plate Slider Shaft Guide A-7 B 24,25 20,21,23, 27 Lever Tension 1 Hook A-7 B 24,25,26 2,3,14,20, 28 Lever Spring Locking Tab A7 B 21,25,23, 24,26 25 29

Gear Assembly P2/Gear Assembly P3

Boss A-8 B

2,3,14,25, 30

Base Assembly P2/Base Assembly P3

Chassis Slot A-8 B 29 2,3,14,25, 31 Base Loading 1 Screw A-9 T 29 2,3,14 32 Base Tension Chassis Embossing A-9 B 2,3,20,21, 33 Arm Assembly Idler Locking Tab A-9 T 22

Starting No.

Procedure

Part Fixing Type

Fig-

ure

View

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

- 4-2 -

DECK MECHANISM DISASSEMBLY

(S3)

(S2)

(S3)

(A)

Stator

Carbon Brush

Drum Motor

Rotor

Drum Sub Assembly

Drum FPC

(S1)

Holder FPC

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.

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.

NOTE

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

Fig. A-1

(Fig. B-1)

Holder FPC

Drum FPC

Cap FPC

Figure in the opposite direction

(Fig. A-1-1)

- 4-3 -

DECK MECHANISM DISASSEMBLY

(B)

(E)

(C1)

(C)

Plate Top

Arm Assembly F/L

Spring Lever S/W

Gear Assembly Rack F/L

Chassis

Opener Door

Bracket Assembly L/D Motor

Holder Assembly CST

(B’)

(C’)

(D)

(E’)

(H6)

(A)

(B)

Lever Assembly S/W

(H8)

Fig. A-2

(Fig. A-2-1)

(Fig. A-2-2)

(Fig. A-2-6)

(Fig. A-2-7)

(Fig. A-2-5)

(Fig. A-2-3)

(Fig. A-2-4)

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