JVC AV-20320/S User manual

No.51964
Mar. 2002
A
V-20320
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V-20321
1COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD. Mar. 2002
AV-20320/S
AV-20321/S
CONTENTS
SPECIFICATIONS ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]] 2
SAFETY PRECAUTIONS ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]] 3
FEATURES]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]
]]] 4
MAIN DIFFERENCE LIST ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]] 5
SPECIFIC SERVICE INSTRUCTIONS ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]] 6
SERVICE ADJUSTMENTS ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]] 11
PARTS LIST ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
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]]
]27
Ӡ
OPERATING INSTRUCTIONS
Ӡ
STANDARD CIRCUIT DIAGRAM ]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]] 2-1
SERVICE MANUAL
COLOR TELEVISION
BASIC CHASSIS
FV5

No. 51964
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SPECIFICATIONS
Items Content
Dimensions (Wѱ
ѱѱ
ѱHѱ
ѱѱ
ѱD) 19-7/8 ѱ17-7/8 ѱ19-1/2 / 50.3cmѱ45.2cmѱ49.3cm
Mass 43.8 Ibs / 19.9 kg
TV RF System CCIR(M)
Color Sound System NTSC / BTSC System (Multi Channel Sound)
TV Receiving Channels and Frequency
VL Band
VH Band
UHF Band
(02ϡ06) 54MHzϡ88MHz
(07ϡ13) 174MHzϡ216MHz
(14ϡ69) 470MHzϡ806MHz
CATV Receiving Channels and Frequency
Low Band
High Band
Mid Band
Super Band
Hyper Band
Ultra Band
Sub Mid Band
TV/CATV Total Channel
(02ϡ06, A-8) by (02ϡ06&01)
(07ϡ13) by (07ϡ13)
(Aϡ1) by (14ϡ22)
(JϡW) by (23ϡ36)
(W+1ϡW+28) by (37ϡ64)
(W+29ϡW+84) by (65ϡ125)
(A8, A4ϡA1) by (01, 96ϡ99)
180 Channels
Intermediate Frequency
Video IF Carrier
Sound IF Carrier
Color Sub Carrier
45.75MHz
41.25MHz (4.5MHz)
3.58MHz
Power Input 120V AC, 60Hz
Power Consumption 87W (US) / 1.4A (CA)
Picture Tube 20 (51cm) Measured Diagonally
High Voltage 26.5kVѰ1kV (at zero beam current)
Speaker 2ѱ3-1/2 / 5ѱ9cm
Oval typeѱ2
Audio Power Output 1W +1W
Input
Video Input
Audio Input
1Vp-p, 75(RCA pin jack)
500mVrms ( -4dBs ) ,High Impedance (RCA pin jack)
Fix Audio Output 500mVrms(-4dBs)
Low impedance (400Hz when modulated 100%)
(RCA pin jack)
Headphone Jack 3.5mm stereo mini jack
(Sound is stereo)
Antenna Terminal 75(VHF/UHF) Terminal, F-Type Connector
Remote Control Unit RM-C205-1C (AV-20320/S)
RM-C205W-1C (AV-20321/S)
(AA/R6/UM-3 batteryѱ2)
Design & specifications are subject to change without notice.
(54MHzϡ804MHz)

No. 51964
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SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many
circuits and components specially for safety purposes. For
continued protection, no changes should be made to the
original design unless authorized in writing by the manufacturer.
Replacement parts must be identical to those used in the
original circuits. Service should be performed by qualified
personnel only.
2. Alterations of the design or circuitry of the products should not
be made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or property
damage resulting therefrom.
3. Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics are
often not evident from visual inspection nor can the protection
afforded by them necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in the parts list of Service manual.
Electrical components having such features are identified
by shading on the schematics and by (

) on the parts list
in Service manual. The use of a substitute replacement which
does not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
4. Use isolation transformer when hot chassis.
The chassis and any sub-chassis contained in some products
are connected to one side of the AC power line. An isolation
transformer of adequate capacity should be inserted between
the product and the AC power supply point while performing
any service on some products when the HOT chassis is
exposed.
5. Don't short between the LIVE side ground and ISOLATED
(NEUTRAL) side ground or EARTH side ground when
repairing.
Some model's power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : () side GND,
the ISOLATED(NEUTRAL) : () side GND and EARTH : ()
side GND. Don't short between the LIVE side GND and
ISOLATED(NEUTRAL) side GND or EARTH side GND and
never measure with a measuring apparatus (oscilloscope etc.)
the LIVE side GND and ISOLATED(NEUTRAL) side GND or
EARTH side GND at the same time.
If above note will not be kept, a fuse or any parts will be broken.
6. If any repair has been made to the chassis, it is recommended
that the B1 setting should be checked or adjusted (See
ADJUSTMENT OF B1 POWER SUPPLY).
7. The high voltage applied to the picture tube must conform with
that specified in Service manual. Excessive high voltage can
cause an increase in X-Ray emission, arcing and possible
component damage, therefore operation under excessive high
voltage conditions should be kept to a minimum, or should be
prevented. If severe arcing occurs, remove the AC power
immediately and determine the cause by visual inspection
(incorrect installation, cracked or melted high voltage harness,
poor soldering, etc.). To maintain the proper minimum level of
soft X-Ray emission, components in the high voltage circuitry
including the picture tube must be the exact replacements or
alternatives approved by the manufacturer of the complete
product.
8. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM. Discharge
the picture tube before attempting meter connection, by
connecting a clip lead to the ground frame and connecting the
other end of the lead through a 10k2W resistor to the anode
button.
9. When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead dress
in the high voltage circuit area. Where a short circuit has
occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
10. Isolation Check
(Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna
terminals, video/audio input and output terminals, Control
knobs, metal cabinet, screwheads, earphone jack, control
shafts, etc.) to be sure the product is safe to operate without
danger of electrical shock.
(1) Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts
exposed to the user, particularly any exposed metal part having
a return path to the chassis should withstand a voltage of
1100V AC (r.m.s.) for a period of one second.
(. . . . W ithstand a voltage of 1100V AC (r.m.s.) to an appliance
rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated
200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
(2) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use a
line isolation transformer during this check.). Using a "Leakage
Current Tester", measure the leakage current from each
exposed metal part of the cabinet, particularly any exposed
metal part having a return path to the chassis, to a known good
earth ground (water pipe, etc.). Any leakage current must not
exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
z
zz
zAlternate Check Method
Plug the AC line cord directly into the AC outlet (do not use a
line isolation transformer during this check.). Use an AC
voltmeter having 1000 ohms per volt or more sensitivity in the
following manner. Connect a 150010W resistor paralleled
by a 0.15F AC-type capacitor between an exposed metal
part and a known good earth ground (water pipe, etc.).
Measure the AC voltage across the resistor with the AC
voltmeter. Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return path to
the chassis, and measure the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Any voltage measured must not exceed 0.75V
AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
0.15

F AC-TYPE
1500

10W
GOOD
EARTH
GROUND
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
AC VOLTMETER
(HAVING 1000

/V,
OR MORE SENSITIVITY)
11. High voltage hold down circuit check.
After repair of the high voltage hold down circuit, this circuit
shall be checked to operate correctly.
See item "How to check the high voltage hold down
circuit".
A V
This mark shows a fast
operating fuse, the
letters indicated below
show the rating.
POWER CORD
REPLACEMENT WARNING.
Connecting the white line side of power
cord to “WHT” character side.

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FEATURES
zNew chassis design enables use of a single board with simplified
circuitry.
zProvided with miniature tuner (TV/CATV).
zMultifunctional remote control permits picture adjustment.
zAdoption of the CHANNEL GUARD function prevents the
specific channels from being selected, unless the “ID number” is
key in.
zI
2C bus control utilizes single chip ICs.
zAdoption of the VIDEO STATUS function.
zAdoption of the ON/OFF TIMER function.
zAdoption of the HYPER SURROUND function.
zWith 75V/U in common (F-Type) ANT Terminal.
zSLEEP TIMER for setting in real time.
zClosed-caption broadcasts can be viewed.
zAudio Video input terminal.
zVariable Audio output terminal.
zBuilt-in MTS system.
zSYSTEM BLOCK DIAGRAM
MEMORY IC
IFȑ
REMOTE
CONTROL
CPU
(MAIN MICON)
SCL
AFC
SDA
SCL SDA
TUNER
TUNER
CONTROL
MTS/TONE ȑChip
DECODER

No. 51964
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MAIN DIFFERENCE LIST



Model
Parts Name
AV-20320/S AV-20321/S
MAIN PWB SFV-1077A-M2 SFV-1083A-M2
POWER CORD QMPD390-200-JS
(Within MAIN PWB)
QMPD209-200-JC
(Within MAIN PWB)
FRONT CABINET LC10109-016A-A LC10109-017A-A
POWER KNOB LC30376-001A-A LC30376-002A-A
PUSH KNOB LC30271-001A-A LC30271-002A-A
REAR COVER LC10108-001E-A LC10108-003D-A
POWER CORD CLAMP LC20106-001D-A LC20106-002C-A
REMOTE CONTROL UNIT RM-C205-1C RM-C205W-1C
WHITE MARK ѱGQ40012-001A-A

No. 51964
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SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the power supply cord.
2. Remove the 5 screws marked #
##
#and 2 screws marked $
$$
$as
shown in Fig.1.
3. Withdraw the REAR COVER toward you.
[CAUTION]
zWhen reinstalling the rear cover, carefully push it inward after
inserting the MAIN PWB into the rear cover groove.
REMOVING THE MAIN PW BOARD
zAfter removing the rear cover.
1. Pick this side of the MAIN PWB and raise one slightly, take off
the PWB stopper marked %
%%
%from the cabinet bottom.
2. Pull out the MAIN PWB as it is.
(If necessary, take off the wire clamp and connectors, etc.)
REMOVING THE SPEAKER
zAfter removing the MAIN PW board.
1. Remove the 2 screws marked &
&&
&.
2. Then you can remove the SPEAKER
CHECKING THE MAIN PW BOARD
1. To check the back side of the MAIN PW Board.
1) Pull out the MAIN PWB. (Refer to REMOVING THE MAIN
PWB).
2) Erect the chassis vertically so that you can easily check the
back side of the MAIN PW Board.
[CAUTION]
zWhen erecting the MAIN PWB, be careful so that there will be no
contacting with other PW Board.
zBefore turning on power, make sure that the CRT earth wire and
other connectors are properly connected.
WIRE CLAMPING AND CABLE TYING
1. Be sure clamp the wire.
2. Never remove the cable tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires with
a new cable tie.

No. 51964
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FRONT CABINET
CRT SOCKET PWB
(Within MAIN PWB)
SPEAKER
REAR COVER
Fig.1
(ѱ5)
A
MAIN PWB
B
D
(ѱ2)
D
C
DEG. COIL
BRAIDED ASS’Y
PWB STOPPER
HVT
TUNER

No. 51964
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MEMORY IC REPLACEMENT
1. Memory IC
This model use a memory IC.
This memory IC stores data for proper operation of the video and deflection circuits.
When replacing, be sure to use an IC containing this (initial value) data.
2. Memory IC replacement procedure
Procedure Screen display
(1) Power off
Switch off the power and disconnect the power cord from the outlet.
(2) Replace the memory IC
Initial value must be entered into the new IC.
(3) Power on
Connect the power cord to the outlet and switch on the power.
(4) System constant check and setting
1) Press
SLEEP TIMER key and, while the indication of “SLEEP TIMER 0
MIN.” is being displayed, press DISPLAY key and VIDEO STATUS key
on the remote control unit simultaneously.
2) The SERVICE MENU screen of Fig.1 is displayed.
3) While the SERVICE MENU is displayed, again simultaneously press
the DISPLAY and VIDEO STATUS keys to display the Fig.2 SYSTEM
CONSTANT screen.
4) Refer to the SYSTEM CONSTANT Table1 and check the setting items.
Where these differ, select the setting item with the MENU UP/DOWN
key and adjust the setting with the MENU LEFT/RIGHT keys. (The
letters of the selected item are displayed in yellow.)
5) After adjusting, release the MENU LEFT/RIGHT key to store the setting
value.
6) Press the EXIT key twice to return the normal screen.
(5) Receive channel setting
Refer to the OPERATING INSTRUCTIONS(USER'S GUIDE) and set the
receive channels (Channels Preset) as described.
(6) User settings
Check the user setting items according to Table 2.
Where these do not agree, refer to the OPERATING INSTRUCTIONS
(USER'S GUIDE) and set the items as described.
(7) SERVICE MENU setting
Verify what to set in the SERVICE MENU, and set whatever is
necessary.(Fig.1) Refer to the SERVICE ADJUSTMENT for setting.
SYSTEM CONSTANT
MODEL :
*******
**************
*******
V-CHIP : YES
CAN V-CHIP : YES
********
****************
********
-
*****
**********
*****
SELECT BY EXIT BY
OPERATE BY EXIT
Fig.2
SERVICE MENU
PICTURE SOUND
GAME
LOW LIGHT HIGH LIGHT
RF AFC CHK
VCO(CW)
SELECT BY EXIT BY
OPERATE BY EXIT
Fig.1
Indicated Model No.

No. 51964
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TABLE 1 (System Constant setting)
Setting value
Setting item Setting content AV-20320/S AV-20321/S
MODEL Display the each application model Conformable model name
V-CHIP YES
CAN V-CHIP YES
TABLE 2 (User setting value)
Setting item Setting value
1. Use remote controller keys
POWER
CHANNEL
CHANNEL PRESET
VOLUME
INPUT (TV/VIDEO)
OFF
CH 02
See OPERATING INSTRUCTIONS.
10
TV
DISPLAY
SLEEP TIMER
VIDEO STATUS
OFF
0
STANDARD
2. Setting of MENU
TINT
COLOR
PICTURE
BRIGHT
DETAIL
CENTER
CENTER
CENTER
CENTER
CENTER
BASS
TREBLE
BALANCE
MTS
TV SPEAKER
CENTER
CENTER
CENTER
STEREO
ON
NOISE MUTING
SET VIDEO STATUS
ON
ALL CENTER
SET CLOCK
ON/OFF TIMER
LANGUAGE
CLOSED CAPTION
BACKGROUND
Unnecessary to set
OFF
ENG
OFF
BLACK
AUTO TUNER SETUP
CHANNEL SUMMARY
V-CHIP
SET LOCK CODE
TUNER MODE : AIR
Unnecessary to set
OFF
Unnecessary to set
YES NO
YES NO

No. 51964
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REPLACEMENT OF CHIP COMPONENT
CAUTIONS
1. Avoid heating for more than 3 seconds.
2. Do not rub the electrodes and the resist parts of the pattern.
3. When removing a chip part, melt the solder adequately.
4. Do not reuse a chip part after removing it.
SOLDERING IRON
1. Use a high insulation soldering iron with a thin pointed end of it.
2. A 30w soldering iron is recommended for easily removing parts.
REPLACEMENT STEPS
1. How to remove Chip parts
Resistors, capacitors, etc.
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with tweezers and remove the chip part.
Transistors, diodes, variable resistors, etc.
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove the
chip part.
Note : After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
Resistors, capacitors, etc.
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the solder.
Then heat and melt the solder at both ends of the chip part.
Transistors, diodes, variable resistors, etc.
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the solder.
(3) First solder lead Aas indicated in the figure.
(4) Then solder leads
Band C.




SOLDER





SOLDER














A
B
C





A
B
C



No. 51964
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SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You can make the necessary adjustments for this unit with
either the Remote Control Unit or With the adjustment
tools and parts as given below.
2. Adjustment with the Remote Control Unit is made on the
basis of the initial setting values, however, the new setting
values which set the screen to its optimum condition may
differ from the initial settings.
3. Make sure that AC power is turned on correctly.
4. Turn on the power for set and test equipment before use, and
start the adjustment procedures after waiting at least 30
minutes.
5. Unless otherwise specified, prepare the most suitable reception
or input signal for adjustment.
6. Never touch any adjustment parts which are not specified in the
list for this adjustment - variable resistors, transformers,
condensers, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions,
preset the following functions with the remote control unit:
User mode position
MENU ITEM PRESET VALUE
VIDEO STATUS STANDARD
BASS/TREBLE/BALANCE CENTER
TINT / COLOUR / PICTURE
BRIGHT / DETAIL CENTER
MTS STERO
ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator)ϙNTSCϛ
4. Remote control unit
5. TV audio multiplex signal generator.
6. Frequency counter
ADJUSTMENT ITEMS
Adjustment item Adjustment item Adjustment item
zB1 POWER SUPPLY zWHITE BALANCE zMTS CIRCUIT
zVIDEO / DEF. CIRCUIT Low Light MTS INPUT LEVEL check
IF VCO High Light MTS STEREO VCO
RF. AGC zPICTURE MTS SAP VCO
FOCUS SUB BRIGHT MTS FILTER check
V. SIZE SUB CONTRAST MTS SEPARATION
H. POSITION MTS COLOR zPURITY / CONVERGENCE
SUB TINT Purity
Static / Dynamic convergence

No. 51964
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ADJUSTMENT LOCATIONS
MAIN PWB
POWER
FRONT
IC421
HV
UPPER : FOCUS
LOWER : SCREEN
U
T
TUNER
IC201
IC702IC701
MENU
CH-CH+VOL-
VOL+
F901
IC921
HVT
T131 CW
31
CW
R926
F902
TP-91
(B1)
TP-E
( )
PW
DEG.
AV IN OUT
ON
TIMER
REMOCON
RECEIVER
S
STEREO
MPX
TP-12B
CRT SOCKET PWB
(Within MAIN PWB ASS'Y)
U
T
TP-E
(SOLDER SIDE)
CRT EARTH
(BRAIDED ASS'Y)
E1
TP-R
E1

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BASIC OPERATION SERVICE MENU
1. TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
2. SERVICE MENU ITEMS
In general, basic setting(adjustments) items or verifications are performed in the SERVICE MENU.
zPICTURE ]]]]]]]]]]]]]]]]]]]] This sets the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION circuits.
zSOUND ]]]]]]]]]]]]]]]]]]]]] This sets the setting values (adjustment values) of the AUDIO circuit.
zGAME ]]]]]]]]]]]]]]]]]]]]]]] This is used when the GAME MODE is adjusted.
zLOW LIGHT ]]]]]]]]]]]]]]]]]] This sets the setting values (adjustment values) of the WHITE BALANCE circuit.
zHIGH LIGHT ]]]]]]]]]]]]]]]]] This sets the setting values (adjustment values) of the WHITE BALANCE circuit.
zRF AFC CHK ]]]]]]]]]]]]]]]]] This is used when the IF VCO is adjusted. [Do not adjust]
zVCO (CW) ]]]]]]]]]]]]]]]]]]] This is used when the IF VCO is adjusted.
3. Basic Operations of the SERVICE MENU
(1) How to enter the SERVICE MENU.
Press SLEEP TIMER key and, while the indication of “SLEEP TIMER 0 MIN.” is being displayed, press DISPLAY key and VIDEO
STATUS key on the remote control unit simultaneously to enter the SERVICE MENU screen Οshown in the next figure page.
(2) SERVICE MENU screen selection
Press the UP / DOWN key of the MENU to select any of the following items.
(The letters of the selected items are displayed in yellow.)
ӟPICTURE ӟSOUND
ӟGAME
ӟLOW LIGHT ӟHIGH LIGHT
ӟRF AFC CHK
ӟVCO(CW)
(3) Enter the any setting ( adjustment ) mode
zPICTURE and SOUND mode
1) If select any of PICTURE or SOUND items, and the LEFT / RIGHT key is pressed from SERVICE MENU ( MAIN MENU ), the screen
Πwill be displayed as shown in figure page later.
2) Then the UP / DOWN key is pressed, the PICTURE mode screen Ρor the SOUND mode screen ΢is displayed, and the PICTURE
or SOUND setting can be performed.
zGAME, LOW LIGHT, HIGH LIGHT, RF AFC CHK and VCO (CW) mode
1) If select any of GAME / LOW LIGHT / HIGH LIGHT / RF AFC CHK / VCO (CW ) items, and the LEFT / RIGHT key is pressed from
SERVICE MENU ( MAIN MENU ), the screens ΣΤΥΦΧwill be displayed as shown in figure page later.
2) Then the settings or verifications can be performed.

No. 51964
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V-20320
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V-20321
14
SERVICE MENU
SELECT BY
OPERATE BY
EXIT BY
IT
PICTURE
GAME
LOW LIGHT HIGH LIGHT
RF AFC CHK
VCO(CW)
EXIT
SELECT BY EXIT BY
IT
EXIT
BRIGHT
EXIT BY
IT
BRIGHT
EXIT
***
******
***
*** *** ***
*** *** ****** *** ***
*** *** ***
SELECT BY
OPERATE BY
EXIT BY
IT
1. BRIGHT
EXIT
STATUS
***
******
***
********
****************
********
EXIT BY
IT
HIGH LIGHT
EXIT
***
******
***
EXIT BY
IT
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
SYNC : YES
EXIT
SELECT BY
OPERATE BY
EXIT BY
IT
RF AFC
FINE
STATUS
EXIT
Ο
ΟΟ
Ο
SERVICE MENU (MAIN MENU)
Π
ΠΠ
Π
SCREEN
Υ
ΥΥ
Υ
HIGH LIGHT MODE
***
******
***
Χ
ΧΧ
Χ
VCO (CW) MODE
Σ
ΣΣ
Σ
GAME MODE
SELECT BY
OPERATE BY
EXIT BY
IT
TINT
COLOR
PICTURE
BRIGHT
DETAIL
EXIT
***
******
***
***
******
***
***
******
***
***
******
***
***
******
***
Φ
ΦΦ
Φ
RF AFC CHK MODE [DO NOT ADJUST]
ON
********
****************
********
Τ
ΤΤ
Τ
LOW LIGHT MODE
Ρ
ΡΡ
Ρ
PICTURE MODE
***
******
***
΢
΢΢
΢
SOUND MODE
SELECT BY
OPERATE BY
EXIT BY
IT
1. IN LEVEL
EXIT
STATUS
***
******
***
********
****************
********
SOUND

No. 51964
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15
(4) Setting method
1) UP / DOWN key of the MENU
Select the SETTING ITEM.
2) LEFT / RIGHT key of the MENU
Setting(adjust) the INITIAL SETTING VALUE of the SETTING ITEM.
When the key is released the SETTING VALUE will be stored
(memorized).
3) EXIT key
Returns to the previous screen.
(5) Releasing SERVICE MENU
1) After returning to the SERVICE MENU upon completion of the setting
(adjustment) work, press the EXIT key again.
Ӡ
Ӡ
SELECT BY
OPERATE BY
EXIT BY
1. IN LEVEL
STATUS
EXIT
***
******
***
********
****************
********
SOUND MODE
SELECT BY
OPERATE BY
EXIT BY
1. BRIGHT
EXIT
STATUS
***
******
***
********
****************
********
PICTURE MODE
INITIAL
SETTING VALUE
Ҵ(Adjust)
SETTING VALUE
SETTING
ITEM
SELECT BY
OPERATE BY
EXIT BY
IT
TINT
COLOR
PICTURE
BRIGHT
DETAIL
EXIT
***
******
***
***
******
***
***
******
***
***
******
***
***
******
***
The letter of the selected
Items are displayed in yellow.
GAME MODE

No. 51964
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V-20320
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V-20321
16
INITIAL SETTING VALUE OF SERVICE MENU
1. Adjustment of the SERVICE MENU is made on the basis of the initial setting values; however, the new setting values which set the screen
in its optimum condition may differ from the initial setting.
2. Do not change the initial setting values of the setting (Adjustment) items not listed in ΁ADJUSTMENT΂.
z
zz
zPICTURE MODE
The four setting items in the video mode No.7 EXT BRI., No.8 EXT PIC., No.11 EXT TINT and No.12 EXT COL. are linked to the items in
the TV MODE No.1 BRIGHT, No.2 PICTURE, No.5 TINT and No.6 COLOR, respectively. When the setting items in the TV mode are
adjusted, the values in the setting items in the video mode are revised automatically to the same values in the TV mode.(The initial setting
values given in ( ) are off-set values.)
When the four items (No.7, 8, 11 and 12) are adjusted in the video mode, the setting values in each item are revised independently.
Initial setting value
No. Setting (Adjustment) items Variable range AV-20320/S AV-20321/S
1. BRIGHT 0 ϡ127 64 64
2. PICTURE 0 ϡ127 95 95
3. TV DTL(TV DETAIL) 0 ϡ63 26 26
4. TV BPF(TV B.P.FILTER) 0 / 1 0 0
5. TINT 0 ϡ127 70 70
6. COLOR 0 ϡ127 48 48
7. EXT BRI.(EXT.BRIGHT) Ѱ25 (-1) (Ѱ0)
8. EXT PIC.(EXT.PICTURE) Ѱ25 (Ѱ0) (Ѱ0)
9. EXT DTL(EXT.DETAIL) 0 ϡ63 26 26
10. EXT BPF(EXT.B.P.FILTER) 0 / 1 0 0
11. EXT TINT Ѱ25 (Ѱ0) (+1)
12. EXT COL.(EXT.COLOR) Ѱ25 (Ѱ0) (+3)
13. V SIZE 0 ϡ63 38 38
14. V CENT.(V.CENTER) 0 ϡ7 00
15. H POS.(H.POSITION) 0 ϡ31 20 20
16. OSD HP (OSD H POSITION) 0 ϡ31 26 26
17. OSD VP (OSD V POSITION) 0 ϡ15 14 14
18. H. AFC 0 / 1 0 0
19. RF AGC 0 ϡ63 40 40
20. OSC SEL 0 / 1 0 0
zSOUND MODE
ϡ
ϡ
ϡ
ϡ
ϡ
ϡ
Ѱ

No. 51964
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zGAME MODE
No. Setting (Adjustment) item Variable range Initial setting value
1. TINT Ѱ20 Ѱ0
2. COLOR Ѱ20 Ѱ0
3. PICTURE Ѱ20 -10
4. BRIGHT Ѱ20 -5
5. DETAIL Ѱ15 +5
zLOW LIGHT MODE
No. Setting (Adjustment) item Variable range initial setting value
1. R CUTOFF 0 ϡ255 20
2. G CUTOFF 0 ϡ255 20
3. B CUTOFF 0 ϡ255 20
zHIGH LIGHT MODE
No. Setting (Adjustment) item Variable range initial setting value
1. G DRIVE 0 ϡ255 128
2. B DRIVE 0 ϡ255 128
zRF AFC CHK MODE
No. Setting (Adjustment) item Variable range initial setting value
1. RF AFC ON / OFF
2. FINE -77 ϡ+77
ON
Ѱңңң
DO NOT
ADJUST

No. 51964
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18
ADJUSTMENTS
z
B1 POWER SUPPLY
Item Measuring
instrument
Test point Adjustment part Description
Check of
B1 POWER
SUPPLY
DC Voltmeter TP-91 (B1)
TP-E(

)
1. Receive a black-and-white signal.
2. Connect the DC Voltmeter to TP-91 (B1) and TP-E(

)(See the
page of Adjustment Locations)
3. Confirm that the voltage is DC134V
z
ADJUSTMENT OF VIDEO / DEF. CIRCUIT
Item Measuring
instrument
Test point Adjustment part Description
IF VCO
adjustment
Signal
generator
CW TRANSF. (T131)
[VCO(CW)] MODE
zUnder normal conditions, no adjustment is required.
1. Receive a NTSC broadcast. (use channels without offset
frequency).
2. Select the VCO(CW) mode from the SERVICE MENU.
3. Confirm the color change (yellow) from ΁TOO HIGH΂to
΁TOO LOW΂by CW TRANSF. and ΁SYNC : YES΂being
shown on the screen. Then, adjust CW TRANSF. until
΁BELOW REFERENCE΂mark turns yellow and confirm
again ΁SYNC : YES΂being shown on the screen.
RF. AGC
adjustment
No.19 RF AGC 1. Receive a broadcast.
2. Select “No.19 RF AGC” of the PICTURE MODE.
3. Press the MUTE key and turn off color.
4. With the MENU LEFT key, get noise in the screen picture. (0
side of setting value)
5. Press the MENU RIGHT key and stop when noise disappears
from the screen.
6. Change to other channels and make sure that there Is no
irregularity.
7. Press the MUTE key and get color out.
FOCUS
adjustment
Signal
generator
FOCUS VR
[In HVT]
1. Receive a crosshatch signal.
2. While looking at the screen, adjust FOCUS VR so that the
vertical and horizontal lines will be clear and in fine detail.
3. Make sure that the picture is in focus even when the screen
gets darkened.
+2V
-2.5V.
EXIT BY
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
SYNC : YES
EXIT
YELLOW

No. 51964
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19
Item Measuring
instruments Test point Adjustment part Description
V.SIZE
Adjustment
Signal
generator
No.13 V.SIZE 1. Receive a crosshatch signal.
2. Select No.13 V SIZE in the PICTURE MODE.
3. Set the initial setting value of No.13 V SIZE with the LEFT /
RIGHT key of the MENU.
4. Adjust No.13 V SIZE until the vertical screen size is 92%.
H.POSITION
Adjustment
Signal
generator
No.15 H POS. 1. Receive a crosshatch signal.
2. Select the No.15 H POS. of the PICTURE MODE.
3. Set the initial setting value of the No.15 H POS. with the LEFT /
RIGHT key of the MENU.
4. Adjust the No.15 H POS. until the screen will be horizontally
centered.
Screen size
Picture size 100%
Screen
size
92%
Picture
size
100%

No. 51964
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zADJUSTMENT OF WHITE BALANCE
Item Measuring
instruments Test point Adjustment part Description
WHITE
BALANCE
(Low Light)
Adjustment
Signal
generator
BRIGHT
R. CUTOFF
G. CUTOFF
B. CUTOFF
SCREEN VR
[In HVT]
1. Receive a black-and-white signal.(Color off)
1. Select the
πLOW LIGHTρ
MODE from the SERVICE MENU.
3. Set the initial setting value of BRIGHT with the LEFT /
RIGHT key of the remote control unit.
4. Set the initial setting value of R CUTOFF, G CUTOFF and
B CUTOFF with the ΢to Χkey of the remote control
unit.
5. Display a single horizontal line by pressing the Οkey of the
remote control unit.
6. Turn the screen VR all the way to the left.
7. Turn the screen VR gradually to the right from the left until
either one of the red, blue or green colors appears faintly.
8. Adjust the two colors which did not appear until the single
horizontal line that is displayed becomes white using the ΢
to Χkeys of the remote control unit.
9. Turn the screen VR to where the single horizontal line
glows faintly.
10. Press the Πkey to return to the regular screen.
ңThe ΡEXIT key is the cancel key for the WHITE
BALANCE.
WHITE
BALANCE
(High Light)
Adjustment
Signal
generator
G. DRIVE
B. DRIVE
1. Receive a black-and-white signal. (Color off)
2. Select theπHIGH LIGHTρMODE in the SERVICE MENU.
3. Set the initial setting value of G DRIVE and B DRIVE with
the Σ, Τ, Φand Χkeys of the remote control unit.
4. Adjust the screen until it becomes white using the Σ, Τ,
Φand Χkeys of the remote control unit.
ңThe Ρ(EXIT) key is the cancel key for the W HITE
BALANCE.
[LOW LIGHT] MODE
BRIGHT
EXIT BY
BRIGHT
EXIT
***
******
***
***
******
***
***
******
*** ***
******
***
ȑ2 3
6
987
54
REMOTE CONTROL UNIT
H.LINE ON EXITH.LINE OFF
R CUTOFF B CUTOFFG CUTOFF
R CUTOFF B CUTOFFG CUTOFF
BRIGHT
G CUTOFF
B CUTOFF
R CUTOFF
[HIGH LIGHT] MODE
EXIT BY
HIGH LIGHT
EXIT
***
******
*** ***
******
***
G DRIVE B DRIVE
Remote Control Unit
Οkey : H.LINE ON
Πkey : H.LINE OFF
Ρkey : EXIT
Σkey : G DRIVE ӗ
Τkey : B DRIVE ӗ
Φkey : G DRIVE ә
Χkey : B DRIVE ә