JVC AV-20FD24 Service Manual

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SERVICE MANUAL

TV/DVD COMBO

AV-20FD24

POWER

TV CATV

DISPLAY

PLAY MODE

SLEEP TIMER

AUDIO

TITLE

123

SUBTITLE

456

JUMP

789

C.C.

RETURN

ANGLE

MARKER ZOOM

REPEATA-BRETURN

–

SLOW

CANCEL

LIGHT

SELECT

MUTING

/ENTER

VOL–VOL

INPUT

–

DVD SETUP

TV MENU

DVD MENUTV/DVDNEXTPREV

B.SEARCH F.SEARCHPLAY

PAUSE/STILLSTOP

OPEN/CLOSE

TV / DVD

CONTENTS

q SPECIFICATIONS.............................................................................................................................................. 2

q OPERATING!INSTRUCTIONS!(APPENDIX)

q SAFETY!PRECAUTIONS .................................................................................................................................. 3

q SPECIFIC!SERVICE!INSTRUCTIONS .............................................................................................................. 7

q SERVICE!ADJUSTMENTS .............................................................................................................................. 19

q GUIDE!FOR!REPAIRING ................................................................................................................................. 25

q STANDARD!CIRCUIT!DIAGRAM ................................................................................................................... 2-1

q PARTS!LIST ..................................................................................................................................................... 37

No. 52133

2003/06

AV-20FD24

SPECIFICATIONS

TELEVISION

Picture Tube: 20” (measured diagonally) Color System: NTSC TV RF System: US System M Tuner Type: Quartz PLL Frequency Synthesized Receiving Channels: VHF 2-13

UHF 14-69 CATV 14-36 (A)-(W)

37-59 (AA)-(WW) 60-85 (AAA)-(ZZZ) 86-94 (86)-(94) 95-99 (A-5)-(A-1) 100-125 (100)-(125) 01 (5A)

Intermediate Frequency: Picture (FP) : 45.75 MHz

Sound (FS) : 41.25 MHz

FP-FS : 4.50 MHz Antenna Input: VHF/UHF In 75 ohms coaxial, F-Type Connector Speaker: 1.8” x 3.9”, 8 ohms x 2 Audio Output Power: 2.5 W + 2.5 W

DVD/CD!PLAYER

Color System: NTSC Applicable Disc: DVD (120 mm, 80 mm)

CD-DA (120 mm, 80 mm)

CD-R/RW (120 mm, 80 mm) Pick up: 1-Lens, 2-Beams System

CD : Wavelength : 775 - 815 nm

Maximum output power : 0.5 mW

DVD : Wavelength : 650 - 666 nm

Maximum output power : 2.0 mW

Frequency Response: DVD : 4 Hz – 22 kHz

CD : 4 Hz – 20 kHz Audio DAC: 192 kHz/24 bit

GENERAL

Power Source: 120 V AC, 60 Hz Power Consumption: 115 Watts Dimensions(W x H x D): 574 mm x 514.5 mm x 483 mm Weight: 56.1 Ibs/25.5 kg Inputs/Outputs: Video input: 1.0 Vp-p, 75 ohm (RCA pin jack)

Audio input: -8 dBm, 50 kohm (RCA pin jack)

Digital Audio output (DVD only): 0.5 Vp-p, 75 ohm (Coaxial) Headphone Jack: 3.5 mm mini-jack Storage Temperature -20 °C ~ 60 °C Operating Temperature 5 °C ~ 40 °C

Accessories:

Remote Control X 1 Batteries (UM-3) X 2

Design!&!specification!are!subject!to!change!without!notice.

No. 52133

SAFETY!PRECAUTIONS

CAUTION

THIS DIGITAL VIDEO PLAYER EMPLOYS A LASER SYSTEM.

TO ENSURE PROPER USE OF THIS PRODUCT, PLEASE READ THIS SERVICE MANUAL CAREFULLY AND RETAIN FOR FUTURE REFERENCE. SHOULD THE UNIT REQUIRE MAINTENANCE, CONTACT AN AUTHORIZED SERVICE LOCATION-SEE SERVICE PROCEDURE.

USE OF CONTROLS, ADJUSTMENTS OR THE PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

TO PREVENT DIRECT EXPOSURE TO LASER BEAM, DO NOT TRY TO OPEN THE ENCLOSURE. VISIBLE LASER RADIATION MAY BE PRESENT WHEN THE ENCLOSURE IS OPENED. DO NOT STARE INTO BEAM.

Location of the required Marking

The rating sheet and the safety caution are on the rear of the unit.

AV-20FD24

CERTIFICATION: COMPLIES WITH FDA RADIATION PERFORMANCE STANDARDS, 21 CFR SUBCHAPTER J.

No. 52133

AV-20FD24

IMPORTANT!SERVICE!SAFETY!INFORMATION

Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these models should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment.

Exercise care when servicing this chassis with power applied. Many B plus and high voltage RF terminals are exposed which, if carelessly contacted, can cause serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections between chassis, escutcheon, picture tube dag and tuner cluster when operating the chassis.

These receivers have a "polarized" AC line cord. The AC plug is designed to fit into standard AC outlets in one direction only. The wide blade connects to the "ground side" and the narrow blade connects to the "hot side" of the AC line. This assures that the TV receiver is properly grounded to the house wiring. If an extension cord must be used, make sure it is of the "polarized" type.

Since the chassis of this receiver is connected to one side of the AC supply during operation, service should not be attempted by anyone not familiar with the precautions necessary when working on these types of equipment.

When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an Isolation Transformer must be used as a safety precaution and to prevent possible damage to transistors. The Isolation Transformer should be connected between the TV line cord plug and the AC power outlet.

Certain HV failures can increase X-ray radiation. Receivers should not be operated with HV levels exceeding the specified rating for their chassis type. The maximum operating HV specified for the chassis used in these receivers is 32kV±1.0kV at zero beam current with a line voltage of 120V AC. Higher voltage may also increase the possibility of failure in the HV supply.

It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the receiver that could cause a rise in high voltage, or operating supply voltages. No changes should be made to the original design of the receiver.

Components shown in the shaded areas on the schematic diagram and/or identified by ! in the replacement parts list should be replaced only with exact factory recommended replacement parts. The use of unauthorized substitute parts may create shock, fire, Xray radiation, or other hazards.

The picture tube used in this receiver employs integral implosion protection. Replace with a tube of the same type number for continued safety. Do not lift picture tube by the neck. Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage completely. Keep others without shatterproof goggles away.

When removing springs or spring mounted parts from the tuner, tuner cluster or chassis, shatterproof goggles must be worn. Keep others without shatterproof goggles away.

Before returning the receiver to the user, perform the following safety checks:

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver.

2. Replace all protective devices such as nonmetallic control knobs, insulating fishpapers, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

3. To be sure that no shock hazard exists, a check for the presence of leakage current should be made at each exposed metal part having a return path to the chassis (antenna, cabinet metal, screw heads, knobs and/or shafts, escutcheon, etc.) in the following manner.

Plug the AC line cord directly into a 120V AC receptacle. (Do not use an Isolation Transformer during these checks.) All checks must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these checks.)

If available, measure current using an accurate leakage current tester. Any reading of 0.35mA or more is excessive and indicates a potential shock hazard which must be corrected before returning the receiver to the owner.

If a reliable leakage current tester is not available, this alternate method of measurement should be used. Using two clip leads, connect a 1500 ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with a known earth ground, such as a water pipe or conduit and the metal part to be checked. Use a VTVM or VOM with 1000 ohms per volt, or higher, sensitivity to measure this AC voltage drop across the resistor. Any reading of

0.35 volt RMS or more is excessive and indicates a potential shock

hazard which must be corrected before returning the receiver to the owner.

To determine the presence of high voltage, use an accurate high impedance HV meter connected between the second anode lead and the CRT dag grounding device. When servicing the High Voltage System, remove static charges from it by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the picture tube dag and 2nd anode lead (have AC line cord disconnected from AC supply).

No. 52133

TO EXPOSED METAL PARTS

VT VM

AC SCALE

1.5K OHMS 10W

15µF TEST PROBE

TO KNOWN EARTH GROUND

AV-20FD24

IMPORTANT!SAFEGUARDS

1. READ!INSTRUCTIONS

All the safety and operating instructions should be read before the unit is operated.

2. RETAIN!INSTRUCTIONS

The safety and operating instructions should be retained for future reference.

3. HEED!WARNINGS

All warnings on the unit and in the operating instructions should be adhered to.

4. FOLLOW!INSTRUCTIONS

All operating and use instructions should be followed.

5. CLEANING

Unplug this unit from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.

6. ATTACHMENTS

Do not use attachments not recommended by the unit’s manufacturer as they may cause hazards.

7. WATER!AND!MOISTURE

Do not use this unit near water. For example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a wet basement, or near a swimming pool.

8 ACCESSORIES

Do not place this unit on an unstable cart, stand, tripod, bracket, or table. The unit may fall, causing serious injury, and serious damage to the unit. Use only with a cart, stand, tripod, bracket, or table recommended by the manufacturer.

8A. An appliance and cart combination should be moved with care. Quick stops, excessive force, and

uneven surfaces may cause the appliance and cart combination to overturn.

9. VENTILATION

Slots and openings in the cabinet and in the back or bottom are provided for ventilation, to ensure reliable operation of the unit, and to protect it from overheating. These openings must not be blocked or covered. The openings should never be blocked by placing the unit on a bed, sofa, rug, or other similar surface. This unit should never be placed near or over a radiator or heat source. This unit should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer’s instructions have been adhered to.

10. POWER!SOURCES

This unit should be operated only from the type of power source indicated on the rating plate. If you are not sure of the type of power supply to your home, consult your appliance dealer or local power company. For units intended to operate from battery power, or other sources, refer to the operating instructions.

11. GROUNDING!OR!POLARIZATION

This unit is equipped with a polarized alternating-current line plug (a plug having one blade wider than the other). This plug will fit into the power outlet only one way. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug should still fail to fit, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the polarized plug. If your unit is equipped with a 3-wire grounding-type plug, a plug having a third (grounding) pin, this plug will only fit into a grounding-type power outlet. This too, is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding-type plug.

12. POWER-CORD!PROTECTION

Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.

13. LIGHTNING

To protect your unit from a lightning storm, or when it is left unattended and unused for long periods of time, unplug it from the wall outlet and disconnect the antenna or cable system. This will prevent damage to the unit due to lightning and power line surges.

14. POWER!LINES

An outside antenna system should not be located in the vicinity of overhead power lines or other electric light or power circuits, or where it can fall into such power lines or circuits. When installing an outside antenna system, extreme care should be taken to keep from touching such power lines or circuits, as contact with them might be fatal.

15. OVERLOADING

Do not overload wall outlets and extension cords, as this can result in a risk of fire or electric shock.

16. OBJECT!AND!LIQUID!ENTRY

Do not push objects through any openings in this unit, as they may touch dangerous voltage points or short out parts that could result in fire or electric shock. Never spill or spray any type of liquid into the unit.

17. OUTDOOR!ANTENNA!GROUNDING

If an outside antenna or cable system is connected to the unit, be sure the antenna or cable system is grounded so as to provide some protection against voltage surges and built-up static charges. Section 810 of the National Electrical Code, ANSI/NFPA 70, provides information with respect to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding conductors, location of antenna discharge unit, connection to grounding electrodes, and requirements for the grounding electrode.

18. SERVICING

Do not attempt to service this unit yourself as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel.

PORTABLE CART WARNING

(symbol provided by RETAC)

S3126A

No. 52133

AV-20FD24

19. DAMAGE!REQUIRING!SERVICE

Unplug this unit from the wall outlet and refer servicing to qualified service personnel under the following conditions:

a. When the power-supply cord or plug is damaged. b. If liquid has been spilled, or objects have fallen into the unit. c. If the unit has been exposed to rain or water. d. If the unit does not operate normally by following the operating instructions. Adjust only those controls that are covered by the

operating instructions, as an improper adjustment of other controls may result in damage and will often require extensive work by a

qualified technician to restore the unit to its normal operation. e. If the unit has been dropped or the cabinet has been damaged. f. When the unit exhibits a distinct change in performance, this indicates a need for service.

20. REPLACEMENT!PARTS

When replacement parts are required, be sure the service technician uses replacement parts specified by the manufacturer or those that have the same characteristics as the original parts. Unauthorized substitutions may result in fire, electric shock or other hazards.

21. SAFETY!CHECK

Upon completion of any service or repairs to this unit, ask the service technician to perform safety checks to determine that the unit is in proper operating condition.

22. WALL!OR!CEILING!MOUNTING

The product should be mounted to a wall or ceiling only as recommended by the manufacturer.

23. HEAT

The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that produce heat.

24. DISC!TRAY

Keep your fingers well clear of the disc tray as it is closing. It may cause serious personal injury.

25. CONNECTING

When you connect the product to other equipment, turn off the power and unplug all of the equipment from the wall outlet. Failure to do so may cause an electric shock and serious personal injury. Read the owner's manual of the other equipment carefully and follow the instructions when making any connections.

26. SOUND!VOLUME

Reduce the volume to the minimum level before you turn on the product. Otherwise, sudden high volume sound may cause hearing or speaker damage.

27. SOUND!DISTORTION

Do not allow the product output distorted sound for a longtime. It may cause speaker overheating and fire.

28. HEADPHONES

When you use the headphones, keep the volume at a moderate level. If you use the headphones continuously with high volume sound, it may cause hearing damage.

29. LEASER!BEAM

Do not look into the opening of the disc tray or ventilation opening of the product to see the source of the laser beam. It may cause sight damage.

30. DISC

Do not use a cracked, deformed, or repaired disc. These discs are easily broken and may cause serious personal injury and product malfunction.

31. NOTE!TO!CATV!SYSTEM!INSTALLER

This reminder is provided to call the CATV system installer’s attention to Article 820-40 of the NEC that provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical.

EXAMPLE OF ANTENNA GROUNDING AS PER THE NATIONAL ELECTRICAL CODE

ELECTRIC SERVICE

EQUIPMENT

NEC-NATIONAL ELECTRICAL CODE

S2898A

ANTENNA LEAD IN WIRE

GROUND CLAMP

ANTENNA DISCHARGE UNIT (NEC SECTION 810-20)

GROUNDING CONDUCTORS (NEC SECTION 810-21)

GROUND CLAMPS

POWER SERVICE GROUNDING ELECTRODE SYSTEM (NEC ART 250, PART H)

No. 52133

SPECIFIC!SERVICE!INSTRUCTIONS

DISASSEMBLY!INSTRUCTIONS

AV-20FD24

1. REMOVAL!OF!MECHANICAL!PARTS AND!P.C.!BOARDS

1-1:!BACK!CABINET!(Refer!to!Fig.!1-1)

1. Remove the 7 screws 1.

2. Remove the screw 2 which are used for holding the Back

Cabinet.

3. Remove the AC cord from the AC cord hook 3.

4. Remove the Back Cabinet in the direction of arrow.

Front Cabinet

1-2:!CRT!PCB!(Refer!to!Fig.!1-2)

CAUTION: BEFORE!REMOVING!THE!ANODE!CAP,!DISCHARGE

ELECTRICITY!BECAUSE!IT!CONTAINS!HIGH VOLTAGE. BEFORE!ATTEMPTING!TO!REMOVE!OR!REPAIR ANY!PCB,!UNPLUG!THE!POWER!CORD!FROM!THE AC!SOURCE.

1. Remove the Anode Cap.

(Refer to REMOVAL OF ANODE CAP)

2. Disconnect the following connector:

(CP801).

3. Remove the CRT PCB in the direction of arrow.

Front Cabinet

Back Cabinet

Fig. 1-1

CRT PCB

CP805

1-3:!AV!PCB/DVD!BLOCK!(Refer!to!Fig.!1-3)

1. Remove the 2 screws 1.

2. Disconnect the following connectors: (CP104, CP301, CP302, CP401 and CP3800).

3. Remove the AV PCB/DVD Block in the direction of arrow.

Front Cabinet

CP104

CP3800

CP301

AV PCB/DVD Block

CP302

1-4:!DVD!BLOCK!(Refer!to!Fig.!1-4)

1. Remove the 11 screws 1.

2. Remove the Top Shield in the direction of arrow (A).

3. Disconnect the following connectors: (CP8001 and CP8002).

4. Remove the 4 screws 2.

5. Remove the DVD Block in the direction of arrow (B).

6. Remove the 2 screws 3.

7. Remove the Jack Shield.

8. Remove the AV PCB in the direction of arrow (C).

(A)

AV PCB

Jack Shield

CP8001

CP8002

Top Shield

DVD Block

(B)

(C)

CP401

Fig. 1-3

Fig. 1-2

No. 52133

Plate Bottom

Fig. 1-4

AV-20FD24

1-5:!DVD!PCB/DVD!DECK!(Refer!to!Fig.!1-5)

1. Make the short circuit on the position as shown Fig.!1-5 using a soldering. If you remove the DVD Deck with no soldering, the Laser may be damaged.

2. Unlock the 2 supports 1.

3. Remove the Front Tray Plate in the direction of arrow (A).

4. Disconnect the following connectors: (CP2001, CP2301 and CP2302).

5. Remove the 4 screws 2.

6. Remove the DVD Deck in the direction of arrow (B).

7. Remove the 4 screws 3.

8. Remove the DVD PCB in the direction of arrow (C).

Deck CD

(A)

DVD PCB

CP2301

Front Tray Plate

(B)

(C)

Make the sort circuit using a soldering.

CP2001

CP2302

Pick Up PCB

Deck Angle

Fig. 1-5

NOTE

When the installation of the DVD Deck, remove all the soldering on the short circuit position after the connection of Pick Up PCB and DVD PCB connector.

No. 52133

AV-20FD24

2. REMOVAL!OF!DVD!DECK!PARTS

NOTE

1. Do not disassemble the DVD DECK PARTS except listedparts here. Minute adjustments are needed if the disassemble is done. If the repair is needed except listed parts, replace the DVD MECHA ASS’Y.

2-1:!TRAY!(Refer!to!Fig.!2-1-A)

1. Set the Tray opened. (Refer!to!the!DISC!REMOVAL!METHOD AT!NO!POWER!SUPPLY)

2. Unlock the support 1 and remove the Tray.

Tray

NOTE

1. In case of the Tray installation, install them as the circled section of Fig. 2-1-B so that the each markers are met.

Tray

Main Frame Ass’y

Fig. 2-1-A

Main Chassis Ass’y

Rack Loading

Move it to the direction of the arrow.

Main Frame Ass’y

Check Lock

Fig. 2-2-B

2-3: RACK!LOADING/MAIN!GEAR/!RACK!LOADING!SPRING

(Refer!to!Fig.!2-3)

1. Remove the Rack L Spring.

2. Press down the catcher 1 and slide the Rack Loading.

3. Remove the Rack Loading, Rack Loading Spring and Main Gear.

Rack Loading

Rack Loading Spring

Rack L Spring

Main Gear

Main Frame

Ass’y

Fig. 2-1-B

2-2:!MAIN!CHASSIS!ASS’Y!(Refer!to!Fig.!2-2-A)

1. Remove the Main Chassis Ass’y from the Insulator (R).

2. Unlock the support 1.

3. Remove the Main Chassis Ass’y.

Insulator (R) (Green)

Main Frame Ass’y

Main Chassis

Ass’y

Fig. 2-2-A

NOTE

1. In case of the Main Chassis Ass’y, install it from (1) to (6) in order. (Refer!to!Fig.!3-2-B)

Main Frame Ass’y

Fig. 2-3

2-4:!CLAMPER!ASS’Y/INSULATOR(R)/LEVER!SWITCH

(Refer!to!Fig.!2-4-A)

1. Remove the screw 1.

2. Remove the Lever Switch.

3. Remove the 2 Insulator (R).

4. Press the Clamper and rotate the Clamper Plate clockwise, then unlock the 3 supports 2.

5. Remove the Clamper Plate, Clamper Magnet and Clamper.

Insulator (R)

Clamper Plate

Clamper Magnet

Lever Switch

(Green)

Insulator (R) (Green)

Clamper

Main Frame

Fig. 2-4-A

No. 52133

AV-20FD24

NOTE

1. When installing the Clamper Magnet, install it with the green face up.

2. When installing the wire of the Lever Switch, install it correctly as Fig. 2-4-B.

3. When installing the Lever Switch, install it correctly as Fig. 2-4-C.

4. In case of the Lever Switch installation, hook the wire on the Main Frame as shown Fig. 2-4-D.

Lever Switch

Red

White

Blue

From DVD PCB

Fig. 2-4-B

The Lever should be position

The Lever should be position between A and B.

between A and B.

Rack Loading

Fig. 2-4-C

Main Chassis Ass’y

raverse Holder

Fig. 2-5-B

2-6:!SWITCH!PCB!ASS’Y!(Refer!to!Fig.!2-6-A)

1. Remove the screw 1.

2. Remove the Switch PCB Ass’y.

Switch PCB Ass’y

Main Chassis Ass’y

• Screw Torque: 4 ±

0.5kgf•cm

Fig. 2-6-A

NOTE

1. When installing the wire of the Switch PCB, install it correctly as Fig. 2-6-B.

2-5:!TRAVERSE!HOLDER/INSULATOR!(F)

(Refer!to!Fig.!2-5-A)

1. Remove the Traverse Holder.

2. Remove the 2 Insulator (F).

Main Chassis Ass’y

Insulator (F) (Black)

Traverse Holder

Insulator (F) (Black)

Lever Switch

Fig. 2-4-D

Fig. 2-5-A

Switch PCB Ass’y

Black

From Relay PCB

White

Fig. 2-6-B

2-7:!RACK!FEED!ASS’Y!(Refer!to!Fig.!2-7-A)

1. Remove the screw 1.

2. Remove the Rack Feed 1/2 Spring, Rack Feed 1/2 and Rack Feed Lever.

Rack Feed 2

Rack Feed 1 Spring

Rack Feed 2 Spring

Rack Feed Lever

Rack Feed 1

Main Chassis

Ass’y

NOTE

1. After the installing of the Traverse Holder, check if the wire is like Fig. 2-5-B.

No. 52133

• Screw Torque: 3.5 ± 0.5kgf•cm

Fig. 2-7-A

AV-20FD24

NOTE

1. After the assembly of the Rack Feed, check if the Rack Feed 1/2 is moving smoothly.!(Refer!to!Fig.!2-7-B)

2. In case of the Rack Feed AssÅfy installation, install correctly as Fig. 2-7-C.

Moving smoothly

Check the position of the Rack Feed Lever

Should not be engaged.

Fig. 2-7-B

Fig. 2-7-C

2-8:!RELAY!PCB!ASS’Y!(Refer!to!Fig.!2-8-A)

1. Remove the screw 1.

2. Remove the Relay PCB Ass’y.

2-9:!GEAR!(Refer!to!Fig.!2-9-A)

1. Unlock the support 1.

2. Remove the Middle Gear 1/2/3, Idler Gear and Feed Gear.

Middle Gear 2

Middle Gear 1

Middle Gear 3

Idler Gear

Main Chassis

Ass’y

Feed Gear

Fig. 2-9-A

NOTE

1. In case of the Idler Gear installation, install correctly as Fig. 2-9B.

2. When installing the Middle Gear 2, check if the Middle Gear 2 is locked correctly as Fig. 2-9-C.

[OK]

Idler Gear

[NG]

Idler Gear

Main Chassis Ass’y

Relay PCB Ass’y

• Screw Torque: 4 ± 0.5kgf•cm

Fig. 2-8-A

NOTE

1. When installing the wire of the Relay PCB, install it correctly as Fig. 2-8-B.

Idler Arm

Check Lock

Middle Gear 2

2-10:!IDLER!ARM!(Refer!to!Fig.!2-10-A)

1. Remove the Idler Arm Spring.

2. Remove the Chassis Spring.

3. Remove the Idler Arm.

Idler Arm Spring

Idler Arm

Fig. 2-9-B

Fig. 2-9-C

Fig. 2-8-B

No. 52133

Main Chassis Ass’y

Chassis Spring

Fig. 2-10-A

AV-20FD24

NOTE

1. In case of the Idler Arm installation, install as the circled section of Fig. 2-10-B.

2. In case of the Idler Arm Spring installation, install as the circled section of Fig. 2-10-C.

3. In case of the Chassis Spring installation, install as the circled section of Fig. 2-10-D.

Idler Arm

Main Chassis Ass’y

Fig. 2-10-B

Idler Arm Spring

Main Chassis Ass’y

Motor Gear

Feed Motor

• Screw Torque: 1 ± 0.5kgf•cm

Fig. 2-11-A

NOTE

1. In case of the Motor Gear installation, check if the valueof the Fig. 2-11-B is correct.

2. When installing the Feed Motor, check if the cable is positioned as Fig. 2-11-C.

Motor Gear

Feed Motor

6.1 ± 0.1mm

Main Chassis Ass’y

Main Chassis

Ass’y

2-11:!FEED!MOTOR!(Refer!to!Fig.!2-11-A)

1. Remove the 2 screws 1.

2. Remove the Feed Motor.

3. Remove the Motor Gear.

Fig. 2-10-C

Chassis Spring

Fig. 2-10-D

Safety surface for pressing of the insert.

Main Chassis Ass’y

Pass the cable between 2 pins.

Fig. 2-11-B

Feed Motor

Fig. 2-11-C

No. 52133

AV-20FD24

3.!REMOVAL!OF!ANODE!CAP

Read the following NOTED items before starting work.

•After turning the power off there might still be a potential voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's potential voltage.

•Do not use pliers to loosen or tighten the Anode Cap terminal, this may cause the spring to be damaged.

REMOVAL

1. Follow the steps as follows to discharge the Anode Cap.

(Refer!to!Fig.!3-1.)

Connect one end of an Alligator Clip to the metal part of a flatblade screwdriver and the other end to ground. While holding the plastic part of the insulated Screwdriver, touch the support of the Anode with the tip of the Screwdriver. A cracking noise will be heard as the voltage is discharged.

GND on the CRT

3. After one side is removed, pull in the opposite direction to remove the other.

NOTE

Take care not to damage the Rubber Cap.

INSTALLATION

1. Clean the spot where the cap was located with a small amount of alcohol. (Refer!to!Fig.!3-3.)

NOTE

Confirm that there is no dirt, dust, etc. at the spot where the cap was located.

Location of Anode Cap

Fig. 3-3

2. Arrange the wire of the Anode Cap and make sure the wire is not twisted.

3. Turn over the Rubber Cap.!(Refer!to!Fig.!3-4.)

Screwdriver

Support

CRT

Alligator Clip

GND on the CRT

2. Flip up the sides of the Rubber Cap in the direction of the arrow and remove one side of the support.

(Refer!to!Fig.!3-2.)

Fig. 3-1

Rubber Cap

CRT

Support

Fig. 3-2

Fig. 3-4

4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig.!3-5.

Support

CRT

5. Confirm that the Support is securely connected.

6. Put on the Rubber Cap without moving any parts.

Fig. 3-5

No. 52133

AV-20FD24

REMOVAL!AND!INSTALLATION!OF!FLAT PACKAGE!IC

REMOVAL

1. Put the Masking Tape (cotton tape) around the Flat Package IC to protect other parts from any damage.

(Refer!to!Fig.!4-1.)

NOTE

Masking is carried out on all the parts located within 10 mm distance from IC leads.

Masking Tape (Cotton Tape)

Fig. 4-1

2. Heat the IC leads using a blower type IC desoldering machine.

(Refer!to!Fig.!4-2.)

NOTE

Do not add the rotating and the back and forth directions force on the IC, until IC can move back and fortheasily after desoldering the IC leads completely.

Blower type IC desoldering machine

3. When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC usinga tweezers and remove the IC by moving with the IC desoldering machine.

(Refer!to!Fig.!4-3.)

NOTE

Some ICs on the PCB are affixed with glue, so be careful not to break or damage the foil of each IC leads or solder lands under the IC when removing it.

Blower type IC desoldering machine

Tweezers

Fig. 4-3

4. Peel off the Masking Tape.

5. Absorb the solder left on the pattern using the Braided Shield Wire. (Refer!to!Fig.!4-4.)

NOTE

Do not move the Braided Shield Wire in the vertical direction towards the IC pattern.

Braided Shield Wire

Soldering Iron

Fig. 4-2

IC pattern

Fig. 4-4

No. 52133

AV-20FD24

INSTALLATION

1. Take care of the polarity of new IC and then install the new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

(Refer!to!Fig.!4-5.)

Soldering Iron

Solder temporarily

Fig. 4-5

2. Supply the solder from the upper position of IC leads sliding to the lower position of the IC leads.

(Refer!to!Fig.!4-6.)

4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thintip Soldering Iron.

(Refer!to!Fig.!4-8.)

Thin-tip Soldering Iron

Fig. 4-8

5. Finally, confirm the soldering status on four sides of the IC using a magnifying glass. Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering.

NOTE

When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If thebending of leads are repaired, the pattern may be damaged. So, be always sure to replace the IC in this case.

Solder

Supply soldering from upper position to lower position

Soldering Iron

Fig. 4-6

3. Absorb the solder left on the lead using the Braided Shield Wire.

(Refer!to!Fig.!4-7.)

NOTE

Do not absorb the solder to excess.

Soldering Iron

Braided Shield Wire

Fig. 4-7

No. 52133

AV-20FD24

SERVICE!MODE!LIST

This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.

To enter to the SERVICE MODE function, press and hold both buttons simultaneously on the main unit and on the remote control for more than a standard time (second).

Set!Key Remocon!Key Operations

VOL. (-) MIN

Standard!Time

(seconds)

Releasing of V-CHIP PASSWORD. Initialization of the factory on TV. NOTE: Do not use this for the normal servicing.

If you set a factory initialization, the memories are reset such as the

channel setting, and the POWER ON total hours. Initialization of the factory on DVD. NOTE: Do not use this for the normal servicing.

The function will only work without the setting of DVD disc at DVD

mode.

While pressing the Remocon Key for more than the Standard Time,

press the Set Key simultaneously. DVD Write mode. Refer to the “RE-WRITE FOR DVD FIRMWARE”. NOTE: The function will only work at the DVD stop mode.

Do not use this for the normal servicing. POWER ON total hours is displayed on the screen. Refer to the "PREVENTIVE CHECKS AND SERVICE INTERVALS" (CONFIRMATION OF HOURS USED).

VOL. (-) MIN

STOP

Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".

Writing of EEPROM initial data. NOTE: Do not use this for the normal servicing. Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment). Check for the firmware version. Refer to the “RE-WRITE FOR DVD FIRMWARE”. NOTE: The function will only work at the DVD stop mode.

Do not use this for the normal servicing. Releasing of PARENTAL LOCK. Refer to the “PARENTAL CONTROL - RATING LEVEL”. NOTE: The function will only work without the setting of DVD disc at DVD

mode.

No. 52133

PARENTAL!CONTROL!-!RATING!LEVEL

(

)

4!DIGIT!PASSWORD!CANCELLATION

If the stored 4 digit password in the Rating Level menu needs to be cancelled, please follow the steps below.

1. Turn Unit ON and set the DVD mode.

2. Check that the “No disk” is displayed on the screen.

3. Press and hold the ‘STOP’ button on the front panel.

4. Simultaneously press and hold the ‘7’ key on the remote control unit.

5. Hold both keys for more than 3 second.

6. The On Screen Display message ‘PASSWORD CLEAR’ will appear.

7. The 4 digit password has now been cleared.

CONFIRMATION!OF!HOURS!USED

POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.

NOTE:!If!you!set!a!factory!initialization,!the!total!hours!is!reset!to!"0".

1. Set the VOLUME to minimum.

2. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.

3. After the confirmation of using hours, turn off the power.

ADDRESS DATA

INIT 00 06 CRT ON 0010

FIG. 1

Initial setting content of MEMORY IC. POWER ON total hours.

= (16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value)

ones digit value

AV-20FD24

WHEN!REPLACING!EEPROM!(MEMORY)!IC

If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.

NOTE:!No!need!setting!for!after!INI!1F!due!to!the!adjustment!value.

INI

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F

06 3F 4C 00 D1 05 30 25 15 53

00 01 00 55 40 0F 77

30 50 AA 49 78 03 50 50 7810 50 55 BA 00 00 00 00

Table!1

1. Enter DATA SET mode by setting VOLUME to minimum.

2. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second. ADDRESS and DATA should appear as FIG 1.

3. ADDRESS is now selected and should "blink". Using the VOL. UP/DOWN button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.

4. Press ENTER to select DATA. When DATA is selected, it will "blink".

5. Again, step through the DATA using VOL. UP/DOWN button until required DATA value has been selected.

6. Pressing ENTER will take you back to ADDRESS for further selection if necessary.

7. Repeat steps 3 to 6 until all data has been checked.

8. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

The unit will now have the correct DATA for the new MEMORY IC.

No. 52133

AV-20FD24

SERVICING!FIXTURES!AND!TOOLS

X-JG176 Up-Date Disc

RE-WRITE!FOR!DVD!FIRMWARE

1. Turn on the power, and set the DVD mode.

2. Confirm that the “No Disc” will be appeared on the screen.

3. Open the DVD tray.

4. Press both VOL. DOWN button on the set and Channel button (5) on the remote control for more than 1 second.

5. Press OPEN/CLOSE button on the unit to check if all the keys on the unit do not function.

NOTE:!To!check!if!DVD!Write!mode!is!set.

6. Place the Up-Date Disc and close the tray by hand.!(Refer!to!SERVICING!FIXTURE!AND!TOOLS)

7. Automatic read will start and "CD-R UPDATE PROCESS" will be displayed on the screen.

8. Approxi. 20 seconds later, the tray will open automatically. Remove the Up-Date Disc.

9. Then, Approxi. 40 seconds later, the above indication will disappear and the tray will close automatically.

10. Unplug the AC cord, then plug it in.

11. After!the!write,!set!to!the!initializing!of!shipping.

12. The "INITIALIZE 9 ---> COMPLETE" will appear on the screen.

13. CHECK!FOR!THE!FIRMWARE!VERSION

14. Turn off the power.

When!inserting!Up-Date!Disc!at!Non!DVD!Write!mode,!the!read!error!will!happen.

At this time, the horizontal noise lines may appear. But no problem.

When the "No Disc" appears on the screen, the write will end.

NOTE:!Do!not!turn!off!the!unit!on!the!way!or!push!the!tray!by!hand!to!close!it.

Up-Date!error!will!happen!and!can!not!be!done!with!the!Up-Date!of!Up-Date!Disc.

Set to the DVD mode, press both VOL. DOWN button on the set and Channel button (4) on the remote control for more than 1 second.

Then unplug the AC cord, and plug it in.

Set to the DVD mode, press both Channel button!(1) on the remote control and the STOP button on the set for more than 3 seconds. Firmware version will be displayed on the top left of the screen. When the changed version displays, the Re-write will be completed.

Version OSD : UAB35091

U A B 3 5 0 9 1

DISC!REMOVAL!METHOD!AT!NO!POWER!SUPPLY

1. Remove the Back Cabinet and AV PCB/DVD Block.

(Refer!to!item!1!of!the!DISASSEMBLY!INSTRUCTIONS.)

2. Slide the Rack Loading (White) toward the arrow direction by using a minus driver to release the lock.

(Refer!to!Fig.!1)

3. Draw the Tray.

Fixed

No. 52133

Released times on the same date

Release date (Example: 2003.5.9)

A = October B = November C = Decembe

Rack Loading (White)

Deck CD

SERVICE!ADJUSTMENTS

ELECTRICAL!ADJUSTMENTS

AV-20FD24

1. BEFORE!MAKING!ELECTRICAL ADJUSTMENTS

Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.

CAUTION

•Use an isolation transformer when performing any service on this

chassis.

•Before removing the anode cap, discharge electricity because it

contains high voltage.

•When removing a PCB or related component, after unfastening or

changing a wire, be sure to put the wire back in its original position.

•When you exchange IC and Transistor for a heat sink, apply the

silicon grease (YG6260M) on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor).

Prepare!the!following!measurement!tools!for!electrical!adjustments.

1. Oscilloscope

2. Digital Voltmeter

3. AC Voltmeter

4. Pattern Generator

5. Multi-Sound Signal Generator

On-Screen!Display!Adjustment

1. Set the VOLUME to minimum.

2. Press the VOL. DOWN button on the set and the

Channel button (9) on the remote control for more than 1 second to appear the adjustment mode on the screen as shown in Fig.!1-1.

Function Step No.

01 OSD

NO. FUNCTION NO. FUNCTION

01 OSD H 02 OSD CONTRAST 03 CUT OFF 04 H POSITION 05 H BLK L 06 H BLK R 07 V SIZE 08 V POSITION 09 V LINEARITY 10 V S CORRECTION 11 V COMP 12 R CUT OFF 13 G CUT OFF 14 B CUT OFF 15 R DRIVE 16 G DRIVE 17 B DRIVE 18 BRIGHTNESS(CENT.) 19 BRIGHTNESS(MAX) 20 BRIGHTNESS(MIN) 21 CONTRAST(CENT.) 22 CONTRAST(MAX) 23 CONTRAST(MIN) 24 COLOR(CENT.) 25 COLOR(MAX) 26 COLOR(MIN) 27 TINT 28 SHARPNESS 29 SUB BIAS 30 BRI. AV(CENT.) 31 BRI. AV(MAX) 32 BRI. AV(MIN) 33 CONT. AV(CENT.) 34 CONT. AV(MAX)

35 CONT. AV(MIN) 36 COL. AV(CENT.) 37 COL. AV(MAX) 38 COL. AV(MIN) 39 TINT AV 40 SHARPNESS AV 41 SUB BIAS 42 BRI. DVD(CENT.) 43 BRI. DVD(MAX) 44 BRI. DVD(MIN) 45 CONT. DVD(CENT.) 46 CONT. DVD(MAX) 47 CONT. DVD(MIN) 48 COL. DVD(CENT.) 49 COL. DVD(MAX) 50 COL. DVD(MIN) 51 TINT DVD 52 SHARPNESS DVD 53 SUB BIAS 54 BRI. GAME(CENT.) 55 BRI. GAME(MAX) 56 BRI. GAME(MIN) 57 CONT. GAME(CENT.) 58 CONT. GAME(MAX) 59 CONT. GAME(MIN) 60 SUB BIAS 61 TUNING V MUTE 62 POWER ON V MUTE 63 INPUT LEVEL 64 SEPARATION L 65 SEPARATION H 66 X-RAY TEST 67 H STOP 68 H FREQ

Fig. 1-2

2.!BASIC!ADJUSTMENTS

2-1:!CONSTANT!VOLTAGE

1. Set condition is AV MODE without signal.

2. Using the remote control, set the brightness and contrast to normal position.

3. Connect the digital voltmeter to TP401.

4. Adjust the VR3800 until the digital voltmeter is 114 ± 0.5V.

Fig. 1-1

3. Use the Channel UP/DOWN button or Channel button (1-0) on the remote control to select the options shown in Fig.!1-2.

4. Press the MENU button on the remote control to end the adjustments.

No. 52133

2-2:!FOCUS

1. Receive the monoscope pattern.

2. Turn the Focus Volume fully counterclockwise once.

3. Adjust the Focus!Volume until picture is distinct.

2-3:!CUT!OFF

1. Adjust the unit to the following settings. R DRIVE=3F, G DRIVE=07, B DRIVE=3F, R CUT OFF=7F, G CUT OFF=7F, B CUT OFF=7F

2. Place the set with Aging Test for more than 15 minutes.

3. Set condition is AV MODE without signal.

4. Using the remote control, set the brightness and contrast to normal position.

5. Activate the adjustment mode display of Fig.!1-1 and press the channel button (03) on the remote control to select "CUT OFF".

6. Adjust the Screen!Volume until a dim raster is obtained.

AV-20FD24

2-4:!WHITE!BALANCE NOTE: Adjust after performing CUT OFF adjustment.

1. Place the set with Aging Test for more than 15 minutes.

2. Receive the gray scale pattern from the Pattern Generator.

3. Using the remote control, set the brightness and contrast to normal position.

4. Activate the adjustment mode display of Fig.!1-1 and press the channel button (16)!on the remote control to select "G DRV".

5. Press the CH. UP/DOWN button on the remote control to select the "R CUT", "G CUT", "B CUT", "R DRV" or "B DRV".

6. Adjust the VOL. UP/DOWN button on the remote control to whiten the R CUT, G CUT, B CUT, R DRV, and B DRV at each step tone sections equally.

7. Perform the above adjustments 5 and 6 until the white color is looked like a white.

2-5:!HORIZONTAL!POSITION

1. Receive the monoscope pattern.

2. Using the remote control, set the brightness and contrast to normal position.

3. Activate the adjustment mode display of Fig.!1-1 and press the channel button (04) on the remote control to select "HPOSI".

4. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum.

2-6:!VERTICAL!POSITION

1. Receive the monoscope pattern.

2. Using the remote control, set the brightness and contrast to normal position.

3. Activate the adjustment mode display of Fig.!1-1 and press the channel button (08) on the remote control to select "VPOSI".

4. Check if the step No. V POSI is "01".

5. Adjust the VR402 until the horizontal line becomes fit to notch of the shadow mask.

2-7:!VERTICAL!SIZE

1. Receive the monoscope pattern.

2. Using the remote control, set the brightness and contrast to normal position.

3. Activate the adjustment mode display of Fig.!1-1 and press the channel button (07) on the remote control to select "VSIZE".

4. Press the VOL. UP/DOWN button on the remote control until the Up/Down OVER SCAN Quantity becomes equal to the Right/Left OVER SCAN Quantity.

5. Receive a broadcast and check if the picture is normal.

2-8:!VERTICAL!LINEARITY NOTE: Adjust after performing adjustments in section 2-7.

After the adjustment of Vertical Linearity, reconfirm the

Vertical Position and Vertical Size adjustments.

1. Receive the monoscope pattern.

2. Using the remote control, set the brightness and contrast to normal position.

3. Activate the adjustment mode display of Fig.!1-1 and press the channel button (09)!on the remote control to select "VLIN".

4. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.

2-9:!LEVEL

1. Receive the VHF HIGH (70dB).

2. Connect the AC voltmeter to pin!6!of!CP101.

3. Activate the adjustment mode display of Fig.!1-1 and press the channel button!(63)!on the remote control to select "LVL".

4. Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 75 ± 2mV.

2-10:!SEPARATION

Please!do!the!method!(1)!or!method!(2)!adjustment. Method!(1)

1. Set the multi-sound signal generator for each different Lch and R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz) and receive the RF signal.

2. Connect the oscilloscope to the Audio!Out!Jack.

3. Press the AUDIO button on the remote control to set to the stereo mode.

4. Activate the adjustment mode display of Fig.!1-1 and press the channel button (64)!on the remote control to select “SEPAL”.

5. Press the VOL. UP/DOWN button on the remote control to adjust it until the audio output wave becomes a fine sine wave.

6. Press the CH UP button 1 time to set to "SEPAH" mode.

7. Press the VOL. UP/DOWN button on the remote control to adjust it until the audio output wave becomes a fine sine wave.

Method!(2)

1. Set the multi-sound signal generator L-ch=1KHz, R-ch=Non input and receive the RF signal.

2. Connect the oscilloscope to the Audio!Out!Jack!(R-ch).

3. Press the AUDIO button on the remote control to set to the stereo mode.

4. Activate the adjustment mode display of Fig.!1-1 and press the channel button (64) on the remote control to select “SEPAL”.

5. Press the VOL. UP/DOWN button on the remote control to adjust it until the R-ch output becomes minimum.

6. Press the CH UP button 1 time to set to "SEPAH" mode.

7. Press the VOL. UP/DOWN button on the remote control to adjust it until the R-ch output becomes minimum.

8. Set the multi-sound signal generator L-ch=Non input, R-ch=1KHz and receive the RF signal.

9. Connect the oscilloscope to the Audio!Out!Jack!(L-ch). Then perform the above adjustments 3~7.

No. 52133

AV-20FD24

2-11:!OSD!HORIZONTAL

1. Activate the adjustment mode display of Fig.!1-1.

2. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum.

(Refer!to!Fig.!2-1)

01 OSD 15

Fig. 2-1

2-12:!BRIGHT!CENTER

1. Receive the monoscope pattern. (RF Input)

2. Using the remote control, set the brightness and contrast to

normal position.

3. Activate the adjustment mode display of Fig.!1-1 and press the

channel button!(18) on the remote control to select "BRTC".

4. Press the VOL. UP/DOWN button on the remote control until the

white 15% is starting to be visible

5. Receive the monoscope pattern. (Audio Video Input)

6. Press the INPUT button on the remote control to set to the AV

mode.

7. Using the remote control, set the brightness and contrast to

normal position.

8. Activate the adjustment mode display of Fig.!1-1 and press the

channel button (30)!on the remote control to select "BRTCA".

9. Press the VOL. UP/DOWN button on the remote control until the

white 15% is starting to be visible

10. Press the TV/DVD button on the remote control to set to the

DVD mode.

11.Activate the adjustment mode display of Fig.!1-1!and press the

channel button (42) on the remote control to select "BRTCD".

12. Press the VOL. UP/DOWN button on the remote control to set

the same step numbers as the AV.

13. Press the INPUT button on the remote control to set to the

GAME mode.

14. Activate the adjustment mode display of Fig.!1-1 and press the

channel button (54) on the remote control to select "BRTCG".

15. Press the VOL. UP/DOWN button on the remote control to set

the same step numbers as the AV.

2-13:!TINT!CENTER

1. Receive the color bar pattern. (RF Input)

2. Using the remote control, set the brightness, contrast, color and tint to normal position.

3. Connect the oscilloscope to TP022.

4. Activate the adjustment mode display of Fig.!1-1 and press the channel button (27)!on the remote control to select "TNTC".

5. Press the VOL. UP/DOWN button on the remote control until the section "A" becomes a straight line.

(Refer!to!Fig.!2-2)

6. Receive the color bar pattern. (Audio Video Input)

7. Press the INPUT button on the remote control to set to the AV mode.

8. Using the remote control, set the brightness, contrast, color and tint to normal position.

9. Activate the adjustment mode display of!Fig.!1-1 and press the channel button (39) on the remote control to select "TNTCA".

10. Press the VOL. UP/DOWN button on the remote control until the section "A" becomes a straight line.

(Refer!to!Fig.!2-2)

11. Press the TV/DVD button on the remote control to set to the DVD mode.

12. Activate the adjustment mode display of Fig.!1-1 and press the channel button (51)!on the remote control to select "TNTCD".

13. Press the VOL. UP/DOWN button on the remote control to set the same step numbers as the AV.

"A"

Fig. 2-2

No. 52133

AV-20FD24

2-14:!COLOR!CENTER

1. Receive the color bar pattern. (RF Input)

2. Using the remote control, set the brightness, contrast, color and tint to normal position.

3. Connect the oscilloscope to!TP024.

4. Activate the adjustment mode display of Fig.!1-1!and press the channel button (24) on the remote control to select "COLC".

5. Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 4 scales on the screen of the oscilloscope.

6. Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 100 ± 5% of the white level. (Refer

to!Fig.!2-3)

7. Receive the color bar pattern. (Audio Video Input)

8. Press the INPUT button on the remote control to set to the AV mode.

9. Using the remote control, set the brightness, contrast, color and tint to normal position.

10. Activate the adjustment mode display of!Fig.!1-1!and press the channel button (36) on the remote control to select "COLCA".

11. Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 4 scales on the screen of the oscilloscope.

12. Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 100 ± 5% of the white level.!(Refer

to!Fig.!2-3)

13. Press the TV/DVD button on the remote control to set to the DVD mode.

14. Activate the adjustment mode display of Fig.!1-1 and press the channel button (48)!on the remote control to select "COLCD".

15. Press the VOL. UP/DOWN button on the remote control to set the same step numbers as the AV.

White 0%

100%

White 100%

Red Level

Fig. 2-3

2-15:!CONTRAST!MAX

1. Activate the adjustment mode display of Fig.!1-1 and press the channel button (22) on the remote control to select "CNTX".

2. Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "49"

3. Receive a broadcast and check if the picture is normal.

4. Press the INPUT button on the remote control to set to the AV mode.

5. Activate the adjustment mode display of Fig.!1-1 and press the channel button (34)!on the remote control to select "CNTXA".

6. Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "4F"

7. Receive a broadcast and check if the picture is normal.

8. Press the TV/DVD button on the remote control to set to the DVD mode.

9. Activate the adjustment mode display of!Fig.!1-1 and press the channel button (46) on the remote control to select "CNTXD".

10. Press the VOL. UP/DOWN button on the remote control to set the same step numbers as the AV.

11.Press the INPUT button on the remote control to set to the GAME mode.

12. Activate the adjustment mode display of Fig.!1-1 and press the channel button (58) on the remote control to select "CNTXG".

13. Press the VOL. UP/DOWN button on the remote control to set the same step numbers as the AV.

2-16:!Confirmation!of!Fixed!Value!(Step!No.)

Please check if the fixed values of the each adjustment items are set correctly referring below.

NO. FUNCTION STEP!NO. NO. FUNCTION STEP!NO.

OSD CONTRAST

H BLK L

H BLK R

V POSITION

V S CORRECTION

V COMP

G DRIVE

BRIGHTNESS(MAX)

BRIGHTNESS(MIN)

CONTRAST(CENT.)

CONTRAST(MIN)

COLOR(MAX)

COLOR(MIN)

SHARPNESS

SUB BIAS

BRI. AV(MAX)

BRI. AV(MIN)

CONT. AV(CENT.)

CONT. AV(MIN)

COL. AV(MAX)

02 00 00 01 07 03 0A 4A 10 3A 05 7F 07 0E 50 4A 10 3A 05 7F

COL. AV(MIN)

SHARPNESS AV

SUB BIAS

BRI. DVD(MAX)

BRI. DVD(MIN)

CONT. DVD(CENT.)

CONT. DVD(MIN)

COL. DVD(MAX)

COL. DVD(MIN)

SHARPNESS DVD

SUB BIAS

BRI. GAME(MAX)

BRI. GAME(MIN)

CONT. GAME(CENT.)

CONT. GAME(MIN)

SUB BIAS

TUNING V MUTE

POWER ON V MUTE

H FREQ

07 0E 50 4A 10 3A 05 7F 07 0E 50 4A 10 3A 05 50 00 40 3F

No. 52133

AV-20FD24

3. PURITY!AND!CONVERGENCE ADJUSTMENTS

NOTE

1. Turn the unit on and let it warm up for at least 30 minutes before

performing the following adjustments.

2. Place the CRT surface facing east or west to reduce the

terrestrial magnetism.

3. Turn ON the unit and demagnetize with a Degauss Coil.

3-1:!STATIC!CONVERGENCE!(ROUGH!ADJUSTMENT)

1. Tighten the screw for the magnet. Refer to the adjusted CRT for

the position.!(Refer!to!Fig.!3-1) If the deflection yoke and magnet are in one body, untighten the screw for the body.

2. Receive the green raster pattern from the color bar generator.

3. Slide the deflection yoke until it touches the funnel side of the

CRT.

4. Adjust center of screen to green, with red and blue on the sides,

using the pair of purity magnets.

5. Switch the color bar generator from the green raster pattern to

the crosshatch pattern.

6. Combine red and blue of the 3 color crosshatch pattern on the

center of the screen by adjusting the pair of 4 pole magnets.

7. Combine red/blue (magenta) and green by adjusting the pair of 6

pole magnets.

8. Adjust the crosshatch pattern to change to white by repeating

steps 6 and 7.

3-3:!STATIC!CONVERGENCE

NOTE

Adjust after performing adjustments in section 3-2.

1. Receive the crosshatch pattern from the color bar generator.

2. Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets.

3. Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets.

3-4:!DYNAMIC!CONVERGENCE

NOTE

Adjust after performing adjustments in section 3-3.

1. Adjust the differences around the screen by moving the deflection yoke upward/downward and right/left.

(Refer!to!Fig.!3-2-a)

2. Insert three wedges between the deflection yoke and CRT funnel to fix the deflection yoke.

(Refer!to!Fig.!3-2-b)

R G B

3-2:!PURITY

NOTE

Adjust after performing adjustments in section 3-1.

1. Receive the green raster pattern from color bar generator.

2. Adjust the pair of purity magnets to center the color on the screen. Adjust the pair of purity magnets so the color at the ends are equally wide.

3. Move the deflection yoke backward (to neck side) slowly, and stop it at the position when the whole screen is green.

4. Confirm red and blue colors.

5. Adjust the slant of the deflection yoke while watching the screen, then tighten the fixing screw.

DEFLECTION YOKE DEFLECTION YOKE SCREW MAGNET SCREW

6 POLE MAGNETS 4 POLE MAGNETS

PURITY MAGNETS

Fig.!3-1

UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT

Fig.!3-2-a

WEDGE

WEDGE POSITION

Fig.!3-2-b

No. 52133

AV-20FD24

4.!ELECTRICAL!ADJUSTMENT!PARTS!LOCATION!GUIDE!(WIRING!CONNECTION)

CRT PCB

TP022

TP024

J801

CP801

CD801

CRT

CD802

CP802B

CP803B

CD803

CP751

CD751

OPERATION PCB

AC IN

SPEAKER

CD301

CP101

CP8002

CP301

CP8001

CP104

TU001

CD3800

CP802A

CP4201

J4201

J4203

CP3800

CD8501

VR3800

CP803A

AV PCB

FB401

TP401

CP401

CRT

CD302

SPEAKER

J2202

VR402

CP302

J2203

J2204

DVD DECK

No. 52133

CP8502

CD8505

CD2301

CD2001

CD2302

CP2001

CP2302

CP2301

DVD PCB

GUIDE!FOR!REPAIRING

IC!DESCRIPTION

AV!PCB!OEC6073A!(IC101)

No. Symbol I/O Logic Function

1 VSS - - Negative power supply (Ground) 2 TV/DVD Output 1 3 PROTECT Output 1 4 TV MUTE Output 1 Volume muting output 5 DVD POWER Output 1 DVD power control output 6 DVD RESET Output 0 Enforced reset output for DVD 7 TV POWER Output 1 Power control output 8

DEGAUSS

9 UART CLOCK Output 1 The asynchronous clock output

10 UART START BIT Input 1 The entry for the asynchronous Start bit detection 11 RX Input - The communication DATA entry from the side of DVD 12 TX Output - The communication DATA output to the side of DVD 13 UART CLOCK IN Input - The asynchronous clock Input 14 H CONTROL Output 1 15 X-RAY IN Input - X-RAY detection input (nom. 0V) 16 AFT Input 1 Voltage of tuning input 17 KEY1 Input 0 Voltage of the TV button input 18 KEY2 Input 0 Voltage of the TV button input 19 AV2 Output 1 20 AV1 Output 1 21 IIC BUS OFF Input 0 Serial clock/data stop input 22 OSD R Output 1 Red output of RGB image output 23 OSD G Output 1 Green output of RGB image output 24 OSD B Output 1 Blue output of RGB image output 25 OSD Y/BLK Output 1 Fast blanking control signal 26 Hsync Input 0 Horizontal synchronization input 27 Vsync Input 0 Vertical synchronization input 28 OVDD - - Positive power supply (+5V nom.) 29 OVCC - - Negative power supply (Ground) 30 TEST Input - Test input (connects with Ground) 31 XIN Input - Connect the main crystal. 32 XOUT Output - Connect the main crystal. 33 RESET Input 0 System reset voltage input 34 POWER FAIL Input 0 Power failure detection input 35 REMOCON Input 0 Remote control input 36 SD Input 0 Synchronization detector input 37 SCL Output - Serial clock output 38 SDA In/Output - Serial data Input/output 39 VSS - - Negative power supply (Ground) 40 VIDEO IN 1 Input - Picture signal input for the Closed Caption (2Vp-p) 41 VIDEO IN 2 Input - Picture signal input for the Closed Caption (2Vp-p) 42 VDD - -

Output 1 Degauss output

TV/DVD picture signal changing output Output terminal for protect from high-voltage remaining

Output terminal for Horizontality Control

TV/DVD picture signal changing output TV/DVD picture signal changing output

Positive power supply (+5V nom.)

AV-20FD24

No. 52133

AV-20FD24

(DVD SECTION)

NO OPEN/CLOSE

TROUBLESHOOTING GUIDE

Check display DVD OSD.

Check the circuit around IC2001.

Change DVD LOADER.

Yes

Check connection CP2301.

Yes

Connection try again CP2301.

Change IC2001.

No. 52133

DVD NO PICTURE

AV-20FD24

Check connection CP8502.

Yes

Check input signal at pins 1, 3 and 5 of CP8502.

Check oscillation of X4001.

Yes

Change IC4003.

Yes

Connection try again CP8502.

Check IC601 and IC4202.

Change X4001.

Yes

Change IC4002.

Yes

Change IC2001.

No. 52133

AV-20FD24

DVD, CD NO PLAY

("BLUE BACK LOGO" SHOW ON

SCREEN.)

After reading,check "INCORRECT DISC" display.

Yes

When play, check the DECK MOTOR moving.

Check connection CD2301.

Connection try again CD2301.

Yes

Change DVD DECK.

Check connection CP2001.

Yes

Check DVD DECK connection bend or short ?

Connection try again CP2001.

No. 52133

INSTABILITY DVD MODE

AV-20FD24

Check connection CD8502.

Yes

Check DVD DECK connection bend or short ?

Yes

Check connection CD2301, CD2001.

Yes

Connection try again CD8502.

Change DVD DECK.

Connection try again CD2301, CD2001.

Change DVD DECK.

No. 52133

AV-20FD24

(TV SECTION)

POWER DOES NOT TURN ON (1)

When turning on the power switch, does the LED light ?

Yes

Is the signal at pin 23 of IC601 normal?

Yes

Check +B line?

Yes

Is the heater of CRT lighted?

Is the voltage at pin 28 of

IC101 of 5.0V?

Yes

Check IC101 and peripheral circuit.

Check AT5V line and

peripheral circuit.

Check the IC601 and

peripheral circuit.

Check Q401, Q405, Q406

and peripheral circuit.

Check CRT TUBE and heater circuit.

Yes

Check IC601 and peripheral circuit.

No. 52133

POWER DOES NOT TURN ON 2

AV-20FD24

F3800 OK ?

Yes

Is the voltage at C3815 DC175V ?

Yes

Is the check feed back switching circuit ok?

Yes

Check Q3803, Q3802 and peripheral circuit.

Change F3801.

Check R3817 and D3808, D3809,

D3815, D3816 peripheral circuit.

Check Q3800, IC3800 and

peripheral circuit.

No. 52133

AV-20FD24

GOOD PICTURE BUT NO SOUND

Is CD301 and CD302 inserted?

Yes

Is the voltage at pin 10 of IC351 DC 21.5V ?

Yes

Is the voltage at pin 11 of IC351 DC 10.3V ?

Yes

Is the voltage at pin 8 of IC351 LESS than DC

2.0V ?

Insert CD301 and CD302.

Check Sound+B line and

peripheral circuit.

Check P.CON+12V line and

peripheral circuit.

Check IC101 and peripheral circuit.

Yes

Is the AUDIO OUT signal at pins 7 and 11 of IC301?

Yes

Check IC301, speaker and Earphone jack.

Check A_OUT_L, A_OUT_R line

and peripheral circuit.

No. 52133

NO PICTURE

AV-20FD24

Are the Brightness and Contrast set to NORMAL?

Yes

Is the voltage at pin 8 of IC1501 DC 5V ?

Yes

Is there a waveform at pin 4 of IC1501.

Yes

Is there a waveform at

pin 7 of IC601.

Adjust Brightness and Contrast.

Check P. CON + 5V line.

Check IC4202 and peripheral circuit.

Check q1501 and peripheral circuit.

Yes

Is the voltage at pins 21 and 13 of IC601 DC 9V ?

Yes

Is the voltage at pins 36 of IC601 DC 5V ?

Yes

Is TV, AV and DVD

MODE of all NG?

Yes

Check P. CON + 9V line.

Check CHROMA +5V line.

Check NG MODE circuit line.

Check IC601 and peripheral circuit.

No. 52133

AV-20FD24

NO COLOR

Is the color set to normal ?

Yes

Is the color signal received ?

Yes

Is the wavefrom at pin 35 of IC601 normal ?

Yes

Check peripheral circuit of IC601.

Adjust the color.

Receive the color signal.

Check the peripheral circuit of X601.

No. 52133

ONLY A LINE APPEARS

AV-20FD24

Is the signal at pin 19 of IC601 normal ?

Yes

Is there a waveform at IIC BUS line normal?

Yes

Is the signal at pin 5

of IC401 normal?

Yes

Check DY and peripheral circuit.

Check IC401 and VCC 25V line.

Yes

Check IC401 and peripheral circuit.

Check the peripheral circuit of IC601.

Check IIC BUS line control IC.

Check FB401 and peripheral circuit.

OSD SCREEN DOES NOT APPEAR

Is there a waveform at pins 22, 23, 24 and 25 of IC101?

Yes

Is there a waveform at pins 54, 55, 56 and 57 of IC601 ?

Yes

Check pin 25 of IC101 and IC601

peripheral circuit.

No. 52133

Check IC101or IC601 and

peripheral circuit.

Check IC601 at pins 20, 21 and 22

peripheral circuit.

AV-20FD24

SERVICE!NOTE!:

No. 52133

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

www.jvcservice.com(US Only)

JVC CANADA INC.

Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 (416)293-1311

(No. 52133)

Printed in Japan

200306WPC

JVC AV-20FD24 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SPECIFICATIONS