JVC AV-20FD22 User manual

No. 51821
Mar. 2001
A
V-20FD22
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
AV-20FD22
CONTENTS
 SPECIFICATIONS㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯
㨯㨯㨯㨯
㨯㨯2
䃨
OPERATING INSTRUCTIONS (APPENDED)
 SAFETY PRECAUTIONS㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 3
 SPECIFIC SERVICE INSTRUCTIONS 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
 SERVICE ADJUSTMENTS 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 13
 GUIDE FOR REPAIRING 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 18
䃨
STANDARD CIRCUIT DIAGRAM (APPENDED)
 PARTS LIST 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯
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㨯㨯㨯㨯 32
SERVICE MANUAL
TV/DVD COMBO

2
AV-20FD22
SPECIFICATIONS
GENERAL
Power upply: AC 120V 60Hz
Power con umption: Operation: 120W
Stand by: 8W
Weight: 56.1lb (25.5 kg)
Dimen ion : Width : 22-5/8 inche (574 mm)
Height: 20-3/8 inche (515 mm)
Depth : 19-1/8 inche (483 mm)
TELEVISION
Picture tube: Type 20 (508 mm diagonal)
Tuner type: Quartz PLL Frequency Synthe ized
Receiving channel : 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)
Antenna input: VHF/UHF In 75 ohm coaxial
Speaker: 3" (76 mm), 8 ohm x 2
Audio output power: 2.5W + 2.5W
DVD/CD player
Signal y tem: NTSC
Applicable di c: 1. DVD (12cm, 8cm)
2. CD (12cm, 8cm)
Audio characteri tic : DVD: 4Hz - 22KHz
Frequency re pon e: CD: 4Hz - 20KHz
S/N Ratio: 90dB
Harmonic di tortion: 0.01%
Wow and flutter: Below Mea urable Level
Dynamic range: 96dB
Input/Output: Input : Video : (RCA) 1 Vp-p/75ohm
Audio : (RCA) –8 dB/50Kohm
Output : Video : (RCA) 1 Vp-p/75ohm
Audio : (RCA) –8 dB/1Kohm
Headphone Jack: 3.5mm Stereo mini-jack
Digital audio out: 0.5Vp-p 75ohm terminated
Pickup: CD : Wavelength: 775 - 815 nm
Maximum output power: 0.5 mW
DVD : Wavelength: 650 - 666 nm
Maximum output power: 2.0 mW
Accessories:
Remote control x 1
Batterie (2 x AA)
Design & specification are subject to change without notice.

3
AV-20FD22
CAUTION
THIS DIGITAL VIDEO PLAYER EMPLOYS A LASER SYSTEM.
TO ENSURE PROPER USE OF THIS PRODUCT, PLEASE READ THIS SERVICE MANUAL CARE-
FULLYAND RETAIN FOR FUTURE REFERENCE. SHOULD THE UNIT REQUIRE MAINTENANCE,
CONTACTANAUTHORIZED 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 NOTTRY 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.
CERTIFICATION: COMPLIES WITH FDA
RADIATION PERFORMANCE STANDARDS,
21 CFR SUBCHAPTER J.
SAFTY PRECAUITONS

4
AV-20FD22
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, X-
ray radiation, or other hazards.
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).
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.
2.
3.
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.
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.
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.
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.
TO KNOWN
EARTH GROUND
AC SCALE
VT VM
1.5K OHMS
10W
15µF
TEST PROBE
TO EXPOSED
METAL PARTS

5
AV-20FD22
IMPORTANT SAFEGUARDS
1.
2.
3.
4.
5.
6.
7.
8.
8A.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
READ INSTRUCTIONS
All the safety and operating instructions should be read before the unit is operated.
RETAIN INSTRUCTIONS
The safety and operating instructions should be retained for future reference.
HEED WARNINGS
All warnings on the unit and in the operating instructions should be adhered to.
FOLLOW INSTRUCTIONS
All operating and use instructions should be followed.
CLEANING
Unplug this unit from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.
ATTACHMENTS
Do not use attachments not recommended by the unit’s manufacturer as they may cause hazards.
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.
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.
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.
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 manufac-
turer’s instructions have been adhered to.
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.
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.
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.
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.
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.
OVERLOADING
Do not overload wall outlets and extension cords, as this can result in a risk of fire or electric shock.
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.
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.
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

6
AV-20FD22
IMPORTANT SAFEGUARDS (CONTINUED)
DAMAGE REQUIRING SERVICE
Unplug this unit from the wall outlet and refer servicing to qualified service personnel under the following conditions:
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.
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.
WALL OR CEILING MOUNTING
The product should be mounted to a wall or ceiling only as recommended by the manufacturer.
HEAT
The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including
amplifiers) that produce heat.
DISC TRAY
Keep your fingers well clear of the disc tray as it is closing. It may cause serious personal injury.
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.
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.
SOUND DISTORTION
Do not allow the product output distorted sound for a longtime. It may cause speaker overheating and fire.
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.
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.
DISC
Do not use a cracked, deformed, or repaired disc. These discs are easily broken and may cause serious personal injury and
product malfunction.
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.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
a.
b.
c.
d.
e.
f.
When the power-supply cord or plug is damaged.
If liquid has been spilled, or objects have fallen into the unit.
If the unit has been exposed to rain or water.
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.
If the unit has been dropped or the cabinet has been damaged.
When the unit exhibits a distinct change in performance, this indicates a need for service.
EXAMPLE OF ANTENNA GROUNDING AS PER THE NATIONAL ELECTRICAL CODE
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)
ELECTRIC SERVICE
EQUIPMENT
NEC-NATIONAL ELECTRICAL CODE
S2898A

7
AV-20FD22
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS
AND P.C. BOARDS
1-1: BACK CABINET (Refer to Fig. 1-1)
1.
2.
3.
4.
Remove the 6 screws 1.
Remove the 2 screws 2which are used for holding the
Back Cabinet.
Remove the AC cord from the AC cord hook 3.
Remove the Back Cabinet in the direction of arrow.
1-3: TV/DVD BLOCK (Refer to Fig. 1-3)
1.
2.
3.
Remove the 2 screws 1.
Disconnect the following connectors:
(CP104, CP301, CP302, CP401 and CP502).
Remove the TV/DVD Block in the direction of arrow.
Fig. 1-3
TV/DVD Block
1
1
1-4: MAIN PCB (Refer to Fig. 1-4)
1.
2.
3.
4.
Remove the 2 screws 1.
Remove the 3 screws 2.
Disconnect the following connectors:
(CP403, CP810B, CP820B and CP811).
Remove the Main PCB in the direction of arrow.
Fig. 1-4
1
1
Main PCB
DVD Block
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.
2.
3.
Remove the Anode Cap.
(Refer to REMOVAL OF ANODE CAP)
Disconnect the following connectors:
(CP801 and CP850B).
Remove the CRT PCB in the direction of arrow.
CRT PCB
Front Cabinet
Fig. 1-1
Front Cabinet
1
1
2
2
1
1Back Cabinet
1
1
3
Fig. 1-2
Front Cabinet
2
2
2
SPECIFIC SERVICE INSTRUCTIONS

8
AV-20FD22
DISASSEMBLY INSTRUCTIONS
1-5: FRONT TRAY PLATE/TOP SHIELD
(Refer to Fig. 1-5)
1.
2.
3.
Remove the Front Tray Plate in the direction of arrow (A).
Remove the 9 screws 1.
Remove the Top Shield in the direction of arrow (B).
Front Tray Plate
1
1
1
11
1
1
1
1
Top Shield
DVD Block Fig. 1-5
1-6: AV PCB/SYSCON PCB/CD DECK (Refer to Fig. 1-6)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the 3 screws 1.
Remove the AV PCB in the direction of arrow (A).
Remove the 4 screws 2.
Remove the Angle Deck in the direction of arrow (B).
Disconnect the following connectors:
(CP4001 and CP4002).
Remove the 4 screws 3.
Remove the CD Deck in the direction of arrow (C).
Remove the 4 screws 4.
Remove the Syscon PCB in the direction of arrow (D).
Fig. 1-5
1
1
1
Bottom Plate
22
2
2
Angle Deck
AV PCB
(A)
(B)
4
4
4
Syscon PCB
4
(D)
3
(C)
(B)
(A)
3
3
CD Deck
3

9
AV-20FD22
2. 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. 2-1.)
Connect one end of an Alligator Clip to the metal part of a
flat-blade 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.
Flip up the sides of the Rubber Cap in the direction of
the arrow and remove one side of the support.
(Refer to Fig. 2-2.)
2.
GND on the CRT
Screwdriver
Alligator Clip
Support CRT
GND on the CRT
Rubber Cap
CRT Support
Fig. 2-1
Fig. 2-2
3. After one side is removed, pull in the opposite direction
to remove the other.
NOTE
DISASSEMBLY INSTRUCTIONS
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 2-3.)
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.
3.
Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 2-4.)
Fig. 2-4
4. Insert one end of the Anode Support into the anode
button, then the other as shown in Fig. 2-5.
CRT Support Fig. 2-5
5.
6. Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts.
Location of Anode Cap
Fig. 2-3
Take care not to damage the Rubber Cap.

10
AV-20FD22
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key.
Press both the VOL. key and remocon keys simultaneously for more than 1 second.
Press both the STOP key and remocon keys simultaneously for more than 3 seconds.
Set Key Remocon Key Operations
Initialization of the factory on TV.
NOTE: No operation at DVD mode.
Do not use this for the normal servicing.
Initialization of the factory on DVD.
NOTE: The operation will work only with STOP mode at DVD mode.
Do not use this for the normal servicing.
VOL. (-) MIN 1
POWER ON total hours are displayed on the screen.
Refer to the "CONFIRMATION OF USING HOURS".
NOTE: No operation at DVD mode.
Can be checked of the INITIAL DATA of MEMORY IC on TV.
Refer to the "NOTE FOR THE REPLACING OF MEMORY IC".
NOTE: No operation at DVD mode.
VOL. (-) MIN 3
VOL. (-) MIN 6
VOL. (-) MIN 0Releasing of V-CHIP PASSWORD.
Writing of EEPROM initial data on TV.
NOTE: No operation at DVD mode.
Do not use this for the normal servicing.
VOL. (-) MIN 9 Display of the Adjustment MENU on the screen.
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
STOP 7
STOP 9 Self-Diagnosis will operate.
Refer to the "SELF-DIAGNOSIS"
Releasing of PARENTAL LOCK.
NOTE: The operation will work only with STOP mode at DVD mode.
VOL. (-) MIN 8
CONFIRMATION OF USING HOURS
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
1.
2.
3.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel
button (6) on the remote control for more than 1 second.
After the confirmation of using hours, turn off the power.
INIT 00 83
0010
CRT ON
ADDRESS DATA
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)

11
AV-20FD22
SELF-DIAGNOSIS
The Self-Diagnosis function will operate when both STOP button on the set and Channel button (9) on the remote control are
pressed simultaneously (for more than 3 seconds) at DVD LOGO screen with No Disc.
NOTE: No diagnosis of FL CHECK on the TV/DVD Player.
Diagnosis Items Diagnosis Method/Result Assumed Defects
1. FL CHECK "FL" will appear on the TV Monitor. Then all indicators will turn on and go out.
All light up (3 seconds) ---> All go out (1 second) ---> All light up all the time
Sight check if all the indicators will turn on or go out.
AV PCB
Power Block
2. SRAM CHECK "SRAM" will appear on the TV Monitor. Then non-specific data will be read
and written on the non-specific address.
If no problem on read and write, "OK" will appear. If any problems, "NG" will
appear.
Syscon PCB
3. VIDEO ENCODER CHECK Color bar and Black/White bar will appear alternately on the TV Monitor.
Color bar (1 second) ---> Black/White bar (1 second) ---> Color bar (1 second)
Sight check if correct color appears or Color and Black/White bar appears
alternately.
Syscon PCB
Power Block
4. TRAY CHECK "TRAY : OPEN" will appear on the TV Monitor. Then the tray will be opened
completely and "TRAY : CLOSE" will appear. Then the tray will be closed.
Sight check if the tray opens or closes correctly.
Syscon PCB
Drive Unit
Power Block
5. EEPROM CHECK "EEPROM" will appear on the TV Monitor. Then non-specific data will be read
and written on the non-specific address.
If no problem on read and write, "OK" will appear. If any problems, "NG" will
appear.
Syscon PCB
6. AUDIO DAC CHECK "ADAC" will appear on the TV Monitor. Then the pink noise will output from
RCA.
Lch ---> Rch ---> Lch+Rch
Check by ear if audio outputs correctly.
Syscon PCB
AV PCB
7. SDRAM "SDRAM" will appear on the TV Monitor. Then non-specific data will be read
and written on the non-specific address.
If no problem on read and write, "OK" will appear. If any problems, "NG" will
appear.
Syscon PCB
After the diagnosis, the results only for the SRAM, EEPROM and SDRAM will appear on the TV Monitor.
In case of OK, "PASS" will appear for the each diagnosis.
RESULT
PASS : SRAM
PASS : EEPROM
PASS : SDRAM
To finish the Self-Diagnosis, turn off the power on the Main unit.

12
AV-20FD22
NOTE FOR THE REPLACING OF 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.
F9 43 05 01 F1 23 27 F7 81 CD
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +FINI
64 67 69 2A 6B 6C 6D 6E 6F
54 74 55 75 75 56 56 76 76 57
78 59 59 79 79 5A 5A 7A 7A 5B
7C 5D 7D 7D 5E 5E 7E 7E 5F
D9 3F 3F 40 61 6300
10 26 70 71 52 72 53 73
20 57 77 77 58 58 78
30 5B 7B 7B 5C 5C 7C
40 5D 5F 5F 7F 7F BF B7
B9 A1 C5 00 C7 00 00 00 97
D9 B0 84 88 9A 9F 2A 5A 00 00
50 AC AF 7F A8 B8 B4 7A
60 00 10 --- --- --- ---
INIT 00 83
0010
CRT ON
ADDRESS DATA
3.
4.
5.
6.
7.
8.
The unit will now have the correct DATA for the new MEMORY IC.
Table 1
1.
2.
Fig. 1
Enter DATA SET mode by setting VOLUME to minimum.
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.
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.
Press ENTER to select DATA. When DATA is selected, it will "blink".
Again, step through the DATA using VOL. UP/DOWN button until required DATA value has been selected.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
Repeat steps 3 to 6 until all data has been checked.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

13
AV-20FD22
ELECTRICAL ADJUSTMENTS
1.
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.
Inferior silicon grease can damage IC's and transistors.
When replacing IC's and transistors, use only specified
silicon grease.
Remove all old silicon before applying new silicon.
Prepare the following measurement tools for electrical
adjustments.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
1. Oscilloscope
2. Digital Voltmeter
3. AC Voltmeter
4. Pattern Generator
2. BASIC ADJUSTMENTS
2-1: CONSTANT VOLTAGE
1.
2.
3.
4.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and contrast
to normal position.
Connect the digital voltmeter to TP401.
Adjust the VR502 until the digital voltmeter is 111 ±0.5V.
Fig. 1-2
NO.
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
FUNCTION
BRI. AV(CENT.)
BRI. AV(MAX)
BRI. AV(MIN)
COL. AV(CENT.)
COL. AV(MAX)
COL. AV(MIN)
TINT AV
SUB CONTRAST AV
CONT. AV(CENT.)
CONT. AV(MAX)
CONT. AV(MIN)
SHARPNESS AV
BRI. DVD(CENT.)
BRI. DVD(MAX)
BRI. DVD(MIN)
COL. DVD(CENT.)
COL. DVD(MAX)
COL. DVD(MIN)
TINT DVD
SUB CONTRAST DVD
CONT. DVD(CENT.)
CONT. DVD(MAX)
CONT. DVD(MIN)
SHARPNESS DVD
BRI. GAME(CENT.)
BRI. GAME(MAX)
BRI. GAME(MIN)
CONT. GAME(CENT.)
CONT. GAME(MAX)
CONT. GAME(MIN)
TUNING V MUTE
POWER ON V MUTE
INPUT LEVEL
SEPARATION L
SEPARATION H
CUT OFF
NO .
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
FUNCTION
R CUT OFF
G CUT OFF
B CUT OFF
G DRIVE
B DRIVE
BRIGHTNESS(CENT.)
BRIGHTNESS(MAX)
BRIGHTNESS(MIN)
COLOR(CENT.)
COLOR(MAX)
COLOR(MIN)
TINT
SUB CONTRAST
CONTRAST(CENT.)
CONTRAST(MAX)
CONTRAST(MIN)
SHARPNESS
RGB CONTRAST
H POSITION
V POSITION
V SIZE
V LINEARITY
V S CORRECTION
EW PARABOLA CORR.
EW TRAPEZIUM CORR.
H SIZE
V EHT
H EHT
RF AGC
V CENTERING
CORNER CORR. TOP
CORNER CORR. BTM
OSD H
FM LEVEL
TEST PWM
TEST TONE CONTROL
2-2: RF AGC
1.
2.
3.
4.
5.
Receive the VHF HIGH (63dB).
Place the set with Aging Test for more than 15 minutes.
Connect the digital voltmeter between the pin 5 of
CP101 and the pin 1 of CP101.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (29) on the remote control to
select "AGC".
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 2.7 ±0.05V.
2-3: CUT OFF
1.
2.
3.
4.
5.
6.
Adjust the unit to the following settings.
G DRIVE=3F, B DRIVE=3F, R CUT OFF=7F, G CUT
OFF=7F, B CUT OFF=7F
Place the set with Aging Test for more than 15 minutes.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (72) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
On-Screen Display Adjustment
In the condition of NO indication on the screen.
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.
1.
Fig. 1-1
Use the Channel UP/DOWN button or Channel button
(1-0) on the remote control to select the options shown
in Fig. 1-2.
Press the TV MENU button on the remote control to
end the adjustments.
2.
3.
01 RCUT
3E
Function
Step No.
SERVICE ADJUSTMENT

14
AV-20FD22
ELECTRICAL ADJUSTMENTS
2-4: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1.
2.
3.
4.
5.
6.
7.
8.
Place the set with Aging Test for more than 15 minutes.
Receive the white 100% signal from the Pattern
Generator.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "RCUT".
Using the VOL. UP/DOWN button on the remote control,
adjust the RCUT.
Press the CH. UP/DOWN button on the remote control to
select the "GDRV", "BDRV", "GCUT" or "BCUT".
Using the VOL. UP/DOWN button on the remote control,
adjust the GDRV, BDRV, GCUT or BCUT.
Perform the above adjustments 6 and 7 until the white
color is looked like a white.
2-5: FOCUS
1.
2.
3.
Receive the monoscope pattern.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-6: HORIZONTAL POSITION
1.
2.
3.
4.
Receive the center cross signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (19) on the remote control to
select "HPOSI".
Press the VOL. UP/DOWN button on the remote
control until the right and left screen size of the vertical
line becomes the same.
2-7: HORIZONTAL SIZE
NOTE: Adjust after performing adjustments in section 2-6.
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select "WIDS".
Press the VOL. UP/DOWN button on the remote
control until the SHIFT quantity of the OVER SCAN on
right and left becomes 10 ±2%.
2-8: VERTICAL LINEALITY
NOTE: Adjust after performing adjustments in section 2-7.
1.
2.
3.
4.
Receive the center cross signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "VLIN".
Press the VOL. UP/DOWN button on the remote
control until the upside and downside screen size of the
horizontal line becomes the same.
2-9: VERTICAL SHIFT
NOTE: Adjust after performing adjustments in section 2-8.
2-10: VERTICAL SIZE
NOTE: Adjust after performing adjustments in section 2-9.
1.
2.
3.
4.
Receive the center cross signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (20) on the remote control to
select "VPOSI".
Press the VOL. UP/DOWN button on the remote
control until the horizontal line becomes fit to the notch
of the shadow mask.
1.
2.
3.
4.
5.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (21) on the remote control to
select "VSIZE".
Press the VOL. UP/DOWN button on the remote
control until the rectangle on the center of the screen
becomes square.
Receive a broadcast and check if the picture is normal.
2-11: PARABOLA CORR
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (24) on the remote control to
select "DPCS".
Press the VOL. UP/DOWN button on the remote control
until the right and left vertical lines are straight.
1.
2.
3.
4.
2-12: TRAPEZIUM
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (25) on the remote control to
select "KEYS".
Press the VOL. UP/DOWN button on the remote control
until the both vertical lines of the screen become parallel.
2-13: CORNER CORR TOP
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (31) on the remote control to
select "CNRT".
Press the VOL. UP/DOWN button on the remote control
until the upper section of the both ends vertical lines are
straight.

15
AV-20FD22
ELECTRICAL ADJUSTMENTS
1.
2.
3.
4.
2-14: CORNER CORR BOTTOM
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (32) on the remote control to
select "CNRB".
Press the VOL. UP/DOWN button on the remote control
until the bottom section of the both ends vertical lines
are straight.
2-15: OSD HORIZONTAL
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (33) on the remote control to
select "OSD".
Press the VOL. UP/DOWN button on the remote control
until the difference of A and B becomes minimum.
(Refer to Fig. 2-1)
1.
2.
B
AFig. 2-1
33 OSD
15
1.
2.
3.
4.
Receive the VHF HIGH (70dB).
Connect the AC voltmeter to TP901.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (69) on the remote control to
select "LVL".
Press the VOL. UP/DOWN button on the remote control
until the AC voltmeter is 75 ±2mV.
2-16: LEVEL
1.
2.
3.
4.
5.
6.
7.
8.
9.
2-17: SEPARATION L/H
Receive the stereo signal (L=2KHz, R=400Hz).
Connect the AC voltmeter to AUDIO OUT JACK though
stereo filter (L=400Hz, R=2KHz).
Press the AUDIO button on the remote control to set to
the STEREO mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (70) on the remote control to
select "SEPAL".
Press the VOL. UP/DOWN button on the remote control
until the output of L-CH and R-CH become minimum.
Press the CH UP button once the set to "SEPAH" mode.
Press the VOL. UP/DOWN button on the remote control
until the output of L-CH and R-CH become minimum.
Press the CH DOWN button once the set to "SEPAL"
mode.
Repeat step 5 to step 8 several times.
The output difference of the between with Filter and
without Filter should be more than 20dB for both L and R.
2-18: SUB BRIGHT CENTER
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Receive the monoscope pattern. (RF Input)
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (06) on the remote control to
select "BRTC".
Press the VOL. UP/DOWN button on the remote control
until the white 15% is starting to be visible
Receive the monoscope pattern. (Audio Video Input)
Press the INPUT button on the remote control to set to
the AV mode.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (37) on the remote control to
select "BRTCA".
Press the VOL. UP/DOWN button on the remote control
until the white 15% is starting to be visible
Press the TV/DVD button on the remote control to set to
the DVD mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (49) on the remote control to
select "BRTCD".
Press the VOL. UP/DOWN button on the remote control
to set the same step numbers as the AV.
2-19: SUB CONTRAST MAX
1.
2.
3.
4.
5.
6.
7.
8.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (15) on the remote control to
select "CNTX".
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "6F"
Press the INPUT button on the remote control to set to
the AV mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (46) on the remote control to
select "CNTXA".
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "71"
Press the TV/DVD button on the remote control to set
to the DVD mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (58) on the remote control to
select "CNTXD".
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "71"

16
AV-20FD22
ELECTRICAL ADJUSTMENTS
2-20: SUB TINT CENTER
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Receive the color bar pattern. (RF Input)
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Connect the oscilloscope to TP803.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (12) on the remote control to
select "TNTC".
Press the VOL. UP/DOWN button on the remote control
until the waveform becomes as shown in Fig. 2-2.
Receive the color bar pattern. (Audio Video Input)
Press the INPUT button on the remote control to set to
the AV mode.
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (43) on the remote control to
select "TNTCA".
Press the VOL. UP/DOWN button on the remote control
until the waveform becomes as shown in Fig. 2-2.
Press the TV/DVD button on the remote control to set to
the DVD mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (55) on the remote control to
select "TNTCD".
Press the VOL. UP/DOWN button on the remote control
until the waveform becomes as shown in Fig. 2-2.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
2-21: SUB COLOR CENTER
Receive the color bar pattern. (RF Input)
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Connect the oscilloscop to TP801.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (09) on the remote control to
select "COLC".
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.
Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 120 ±5% of the
white level. (Refer to Fig. 2-3)
Receive the color bar pattern. (Audio Video Input)
Press the INPUT button on the remote control to set to
the AV mode.
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (40) on the remote control to
select "COLCA".
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.
Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 120 ±5% of the
white level. (Refer to Fig. 2-3)
Press the TV/DVD button on the remote control to set to
the DVD mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (52) on the remote control to
select "COLCD".
Press the VOL. UP/DOWN button on the remote control
to increase the step numbers by 3 steps to the AV.
0%
Fig. 2-3
White 0%
White 100%
100%
Red Level
Fig. 2-2

17
AV-20FD22
ELECTRICAL ADJUSTMENTS
3.
1.
2.
3.
1.
2.
3.
4.
5.
6.
7.
8.
1.
2.
3.
4.
5.
Receive the green raster pattern from color bar
generator.
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.
Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole
screen is green.
Confirm red and blue colors.
Adjust the slant of the deflection yoke while watching the
screen, then tighten the fixing screw.
DEFLECTION YOKE
DEFLECTION YOKE SCREW
MAGNET SCREW
PURITY MAGNETS
6 POLE MAGNETS
4 POLE MAGNETS
Fig. 3-1
PURITY AND CONVERGENCE
ADJUSTMENTS
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
Turn the unit on and let it warm up for at least 30
minutes before performing the following adjustments.
Place the CRT surface facing east or west to reduce the
terrestrial magnetism.
Turn ON the unit and demagnetize with a Degauss Coil.
3-3: STATIC CONVERGENCE
1.
2.
3.
3-4: DYNAMIC CONVERGENCE
Adjust after performing adjustments in section 3-3.
1.
2.
Adjust the differences around the screen by moving
the deflection yoke upward/downward and right/left.
(Refer to Fig. 3-2-a)
Insert three wedges between the deflection yoke and
CRT funnel to fix the deflection yoke.
(Refer to Fig. 3-2-b)
R G B
R
G
B
Fig. 3-2-a
WEDGE WEDGE
WEDGE
WEDGE POSITION
Fig. 3-2-b
R G B
R
G
B
Receive the crosshatch pattern from the color bar
generator.
Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT
Adjust after performing adjustments in section 3-2.
Adjust after performing adjustments in section 3-1.
3-2: PURITY
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.
Receive the green raster pattern from the color bar
generator.
Slide the deflection yoke until it touches the funnel
side of the CRT.
Adjust center of screen to green, with red and blue on the
sides, using the pair of purity magnets.
Switch the color bar generator from the green raster
pattern to the crosshatch pattern.
Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
Adjust the crosshatch pattern to change to white
by repeating steps 6 and 7.
NOTE NOTE
NOTE
NOTE

18
AV-20FD22
MAJOR COMPONENTS LOCATION GUIDE
TU001
AV PCB
MAIN PCB
CP101
J7002
J7003
IC601
TP901
IC101
IC701
FB401
FOCUS VOLUME
SCREEN VOLUME
VR502
T501
TP401
R449
CRT PCB
J801 TP803 TP801
GUIDE FOR REPAIRING

19
AV-20FD22
IC DESCRIPTION
OEC6063A
No. Symbol I/O Logic Function Function
1 VSS - - Negative power supply (Ground)
2 X-RAY TEST Output 1 X-RAY test output C-MOS
3 RGB/COMP Output - It changes "Rgb/Composite" picture signal for "DVD". C-MOS
4 TV MUTE Output 1 Volume muting output C-MOS
5 EXT MUTE Output 1 External picture/volume muting output C-MOS
6 DVD RESET Output 0 Enforced reset output for DVD C-MOS
7 TV POWER Output 1 Power control output C-MOS
8 VOLUME PWM Output - Puls width modulation output for the volume control C-MOS
9 UART CLOCK Output - The asynchronous clock output C-MOS
10 UART START BIT Input - The entry for the asynchronous Start bit detection C-MOS
11 RX Input - The communication DATA entry from the side of DVD C-MOS
12 TX Output - The communication DATA output to the side of DVD Nch-OD
13 UART CLOCK IN Input - The asynchronous clock Input C-MOS
14 BBE H Output 1 BBE output C-MOS
15 X-RAY IN Input - X-RAY detection input (nom. 0V) C-MOS
16 AFT Input - Voltage of tuning input C-MOS
17 KEY1 Input - Voltage of the TV button input C-MOS
18 KEY2 Input - Voltage of the TV button input C-MOS
19 TV/DVD Output 1 TV/DVD picture signal changing output C-MOS
20 DEGAUSS Output 1 Degauss output Nch-OD
21 IIC BUS OFF Output 0 Serial clock/data stop input C-MOS
22 OSD R Output 1 Red output of RGB image output C-MOS
23 OSD G Output 1 Green output of RGB image output C-MOS
24 OSD B Output 1 Blue output of RGB image output C-MOS
25 OSD Y/BLK Output 1 Fast blanking control signal C-MOS
26 Hsync Input 0 Horizontal synchronization input C-MOS
27 Vsync Input 0 Vertical synchronization input C-MOS
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 C-MOS
35 REMOCON Input 0 Remote control input C-MOS
36 SD Input 1 Synchronization detector input C-MOS
37 SCL Output 1 Serial clock output Nch-OD
38 SDA In/Output 1 Serial data Input/output Nch-OD
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 - - Positive power supply (+5V nom.)

20
AV-20FD22
TROUBLESHOOTING GUIDE
NO POWER(1)
(TV SECTION)
Check of AT +8V line and AT
+5V line.
YES
Is the voltage at
pin1 of Q505
DC7.3V?
NO
YES
NO
YES
NO
YES
NO
Q510,Q509,Q503
OK? Check Q510,Q509,Q503 and TV
POWER H Line.
Check IC501 and associated
circuit.
When it pushed
POWER ON SW as for
LED is it lighted?
Is the voltage at
pin34 of IC101
DC4.7V?
Check Q505 and associated
circuit.
Check IC101 and associated
circuit.