Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
This service manual provides service instructions for the PTV Models listed below. Service personnel should read this
manual thoroughly before servicing these chassis.
V20B CHASSIS
VS-A50
WS-A48
WS-A55
WS-A65
This service manual includes:
1. Assembly and disassembly instructions for the front and rear cabinet components.
2. Servicing of the Lenticular Screen and Fresnel Lens.
3. Servicing printed circuit boards (PCBs).
4. CRT replacement procedure.
5. Electrical adjustments.
6. Chip parts replacement procedures.
7. Circuit path diagrams.
The parts list section of this service manual includes:
1. Cabinet and screen parts.
2. Electrical parts.
Schematic and block diagrams of the above listed models are included in this service manual for better understanding of the circuitry. PCB drawings are also included for easy location of parts and test points.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in television receivers 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 special safety characteristics are identified in this service manual.
Electrical components having such features are identified by shading on the schematic diagram and by bold
type in the parts list of this service manual. The replacement for any safety part should be identical in value
and characteristics.
Page 5
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
SAFETY PRECAUTIONS
NOTICE:Observe all cautions and safety related notes located inside the receiver cabinet and on the
receiver chassis.
WARNING:
1.Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard
from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is
not thoroughly familiar with the precautions necessary when working on high voltage equipment.
2.Do not install, remove or handle the picture tubes in any manner unless shatterproof goggles are
worn. People not so equipped should be kept away while the picture tube is being handled. Keep
the picture tube away from the body while handling.
3.When service is required, observe the original lead dress. Extra precaution should be taken to
assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those
components that indicate evidence of overheating.
X-Radiation warning
The surface of the cathode ray tubes (CRTs) may generate X-Radiation, so take proper precautions when servicing. It is recommended that a lead apron be used for shielding while handling the CRT. Use this method if
possible.
When replacing the CRTs, use only the designated replacement part since it is a critical component with regard to
X-Radiation. High voltage must be set as prescribed under the section titled Electrical Adjustments.
Leakage current check
Before returning the receiver to the customer, it is recommended that leakage current be measured according to
the following methods.
1. Cold Check
With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug
prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal
part (i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts
having a return path to the chassis should be a minimum of 1Mega Ohm. Any resistance below this value
indicates an abnormal condition and requires corrective action.
2. Hot Check ...Use the circuit shown below to perform the hot check test.
1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after
connection, and with the switching devices of the receiver in their operating positions, measure
the leakage current for both positions of switch S2.
2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the
switching devices of the receiver in their operating positions, measure the leakage current for both
positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has
reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).
Page 6
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
CABINET DISASSEMBLY (FRONT VIEW)
*Refer to PARTS LIST for Part Numbers
WS-A48
Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove the Board-Front by removing screws "a".
3. Remove the Screen Assembly by removing screws "b". Disconnect all cable harnesses between the Screen
Assembly and the PCB-Signal.
4. Lift the Screen Assembly and pull up and away from the cabinet as shown.
Page 7
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
CABINET DISASSEMBLY (REAR VIEW)
WS-A48
Rear Cabinet Disassembly
1. Remove the Back Board by removing screws "a", “b” and “c”.
2. Remove the Back Cover by removing screws "e".
3. Remove 4 screws "d" securing the Light Box Assembly.
4. Be certain that all cables and connectors between the Light Box Assembly and external items are disconnected (e.g. speaker plugs).
5. Slide the Light Box Assembly out of the cabinet.
Page 8
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
CABINET DISASSEMBLY (FRONT VIEW)
VS-A50WS-A55
WS-A65
Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove the Front-Board by removing screws "a".
3. Remove the Screen Assembly by removing screws "b". Disconnect all cable harnesses between the Screen
Assembly and the PCB-Signal.
4. Lift the Screen Assembly and pull up and away from the cabinet as shown.
Page 9
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
CABINET DISASSEMBLY (REAR VIEW)
VS-A50 WS-A55
WS-A65
Rear Cabinet Disassembly
1. Remove the Back Board by removing screws "a".
2. Remove the Board Slide by removing screws “b”.
3. Remove the two Board Shelves by removing screws “c”.
4. Remove 4 screws "d" securing the Light Box Assembly.
5. Be certain that all cables and connectors between the Light Box Assembly and external items are discon-
nected (e.g. speaker plugs).
6. Slide the Light Box Assembly out of the cabinet.
Page 10
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
VS-A50WS-A55
WS-A65
1.Removal of the Lenticular Screen and Fresnel Lens
CAUTION: Wear gloves when handling the Lenticular Screen and the Fresnel Lens.
This prevents cuts and finger prints. Do not place the Fresnel Lens in the sun.
This may cause fire and heat related injuries.
1. Remove the screen assembly as shown in the Cabinet Disassembly procedure.
2. Remove the Screen Holder by removing screws (a).
3. Slide the Lenticular Screen and Fresnel Lens from the Screen Frame.
Note: When separating the Lenticular Screen from the Fresnel Lens, use caution
while prying the Screen and Lens apart. Use a slot type screw driver, and
remove the pressure sensitive, double sided tape.
Page 11
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
WS-A48
CAUTION: Wear gloves when handling the Lenticular Screen and Fresnel Lens.
This prevents cuts and finger prints. Do not place Fresnel Lens in the sun.
This may cause fire and heat related injuries.
1c. Lenticular Screen and Fresnel Lens Removal
1. Remove the screen assembly as shown in the Cabinet Disassembly procedure.
2. Remove the Top, Bottom and Side Holder Screens..
3. Carefully lift the Lenticular Screen and Fresnel Lens combination from the Screen Frame Assembly.
Note: When separating the Lenticular Screen from the Fresnel Lens, use caution
while prying the Screen and Lens apart. Use a slot type screw drive, and
remove the pressure sensitive double sided tape.
Page 12
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
2.Installation of the Lenticular Screen and Fresnel Lens
Note: Store the Lenticular Screen and Fresnel Lens in a cool dry place. High humidity may
deform the Lenticular Screen and Fresnel Lens.
1. Apply double coated tape (Part # LENS-TAPE) along the top front edge of the Fresnel Lens
as shown in
2. Place the Fresnel Lens on top of the Lenticular Screen and apply pressure at the top edge to
bond them together as shown in
3. Reverse the disassembly procedure for that model to install the screens in the screen frame.
To p
Figure 2-2
. Refer to
( * X ) inch
Double Sided Tape
(Part# LENS-TAPE)
Table A
Figure 2-2
and
.
Fresnel Lens
Table B
for proper tape length.
To p
Fresnel
Lens
Lenticular
Screen
Bottom
Lenticular Screen
Figure 2-2
4:3 Aspect Models
Model
VS-A5050"40"
16:9 Aspect Models
Model
W S-A4848"41.76
W S-A5555"47.85
W S-A6565"56.55
Screen
Size
Table A
Screen
Size
Table B
Bottom
Tape
Length
Tape
Length
0.16 inch
Page 13
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
CABINET SEPARATION PROCEDURE
(WS-A65)
Model WS-A65 cabinet is assembled in two pieces. These two pieces may be separated to allow easier delivery and
setup.
Cabinet Separation Precedure
1. Remove the Screen Assembly and disconnect
all cable harnesses between the Frame
Assembly and the PCB-SIGNAL, refer to
Cabinet Front Disassembly.
2. Remove the 4 screw covers “a”.
3. Remove 4 screws “b” securing the top and
bottom cabinet sections .
4. Carefully lift the cabinet top and place it on
the floor.
5. Place the cabinet bottom in the desired location.
6. Reverse the procedure and mount the cabinet
top on the cabinet bottom.
7. Reinstall the the Screen Assembly and
connect all cable harnesses between the
Screen Assembly and the PCB-SIGNAL.
Page 14
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
SERVICING THE DIAMONDSHIELD™
1.DiamondShield™ Removal Procedure
The location of the DiamondShieldTM molding clips may vary between models, top and bottom, or sides. Use
the appropriate disassembly procedure given below.
Note:
Wear gloves when handling the DiamondShield™ to prevent finger prints.
Top & Bottom Molding Clips
1. Gently insert a small screwdriver between the
DiamondShield™ and one end of the clip to pry
the clip loose.
Side Molding Clips
1. Gently insert a small screwdriver between the
DiamondShield™ and one end of the clip to pry
the clip loose.
2. Remove both clips by pulling them toward you.
3. Carefully insert a small screwdriver into the gap
at the top/center point of the Shield and pull the
Shield slightly away from the unit. Place your
hands at the points shown and gently bow the
Shield toward you and remove from the unit.
Then re-install the two clips.
2.DiamondShield™ Installation Procedure
*(See the Parts List for DiamondShield™ part numbers)
To install the DiamondShieldTM, reverse the above Removal Procedure.
2. Remove both clips by pulling them toward you.
3. Carefully insert a small screwdriver into the gap
at the side/center point of the Shield and pull the
Shield slightly away from the unit. Place your
hands at the points shown and gently bow the
Shield toward you and remove from the unit.
Then re-install the two clips.
Page 15
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
SERVICING PCBs
Chassis Removal and PCB Locations
Chassis Removal
1) Remove screw “a” from the Main Chassis.
2) Raise the two chassis locks on the inner sides of the
Lightbox Assembly and slide the chassis towards the
rear.
Major Parts Locations
Page 16
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
ANODE LEAD REMOVAL
CAUTION:To prevent damage, the following procedure must be used when removing an
Anode Lead from the Flyback Transformer.
1) Push the Anode Lead down.
3) Carefully remove the Anode Lead
from the Flyback Transformer.
2) While holding the lead down rotate
the lead 90º counter clockwise.
CRT REPLACEMENT
1. Removal of the CRT
Caution!High voltage should be completely discharged prior to CRT removal.
Since the CRTs receive high voltage from the Flyback transformer, discharge
by shorting the open end of the respective high voltage cable to chassis ground.
Note: Refer to Cabinet Disassembly when performing steps 1 through 4.
1. Remove the Speaker Grille, Front Board, and Screen Assy.
2. Remove the Back Board.
3. Remove the Anode Lead Wire from the Flyback transformer. (Use the above procedure)
4. Remove the PCB-CRT.
5. Remove 4 hex-screws "a" retaining the Optical Unit. [Figure 5-1]
6. Remove 4 screws "b" retaining the Lens.
Note: DO NOT loosen the RED screws. Doing so will break the seal between the
C-Element and the # 6 Lens, causing leakage of the CRT Coolant.
7. Remove 4 screws "c" retaining the CRT. [Figure 5-2]
8. Remove the Deflection Yoke from the neck of the CRT. [Figure 5-7]
Figure 5-1
Page 17
2. Installation of the CRT
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Note: The 4 spring-loaded screws shown
in Fig 5-2 and labeled as "DO NOT
REMOVE", should not be loosened
under any circumstance. Doing so
will break the seal between the
CRT and the CRT-Spacer, causing
leakage of the CRT Coolant.
Figure 5-2
Note: The replacement CRT is supplied as an assembly comprised of the CRT and the
Inner Lens with the space between them filled with ethylene glycol. Care should
be taken during handling and installation to prevent shock from disrupting the seal
or alignment between the CRT and Inner Lens. [Figure 5-3]
Figure 5-3
Figure 5-4
Page 18
Figure 5-5
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
1. Carefully position the replacement CRT and fasten in place using 4 screws "d". [Figure 5-5]
2. Install the Deflection Yoke on the CRT neck. [Figure 5-6]
3. Install the Lens that was removed in steps 5 and 6 of Removal Of The CRT. [ Figures 5-1 and 5-2 ]
a) Position the Lens so that the Label faces the direction shown in Figure 5-7
b) Install the mounting screws. [Figure 5-1]
4. Install the PCB-CRT.
5. Insert the Optical Unit into the Light Box Assembly.
6. Insert the Anode Lead Wire into the Flyback Transformer.
7. Re-clamp the Lead Wire in its original position.
Figure 5-6
Figure 5-7
Adjustment procedures after replacing the CRT(s)
• CRT Cut Off / White Balance Adjustment
• Static Convergence Adjustment
• Dynamic Convergence Adjustment
Page 19
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
ELECTRICAL ADJUSTMENTS
Note: Perform only the adjustments required.
Do not attempt an alignment if proper equipment is not available.
1.Test Equipment
• Oscilloscope (Unless otherwise specified, use 10:1 probes)
• Signal Generator (both SD and HD capable)
• Frequency Counter
• Direct Current Voltmeter
Direct Current Power Supply
• Multiplex Audio Signal Generator
• Direct Current Ampere Meter
2.Test Signal
A. Monoscope Signal
Note: If you do not have
a monoscope signal source,
connect the unit to a VCR
and play a Monoscope
*alignment tape.
(* Part Number: 859C568060)
B. Color Bar Signal
Use the color bar signal shown
below, unless otherwise specified
in this manual.
100%
75%
40%
40%
Monoscope Signal
1H
Split-Field Color Bars (100% window)
Page 20
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
r
3.Initial Setup
A. Option Menu Setup
Follow the steps below for the initial set-up:
1. Select the "MENU" display by pressing the "MENU" button once.
2. Press the number buttons "2", "2", "7", "0" in sequence to select the "OPTION MENU" display.
3. Press the "ADJUST" button to select "INITIAL."
4. Press "ENTER."
NOTE:At this time channel 3 is automatically selected.
MENU-2-2-7-0
OPTION MENU
Initial
Power Restore:OFF
DTV Port:Auto
Direct Key Mode:OFF
B. Default Settings
MAIN MENU DEFAULT SETTINGS
SETUP
Memorize channelsANT-A - Ai
Language (idioma)EnglishTV Speakers (Internal)On
Front Button LockOffV-Chip Start Time12:00AMAudio OutputVariable
CLOCK
Clock SettingAutoLoc k by TimeOffTV Bass0.5
Time ZoneEasternLock TimeN/ATV Treble0.5
Daylight Savings TimeAppliesUnlock TimeN/ATV Balance0.5
Clock TimeN/ATV SurroundOff
Set DayN/AVideo MuteOnTV Listen ToStereo
CAPTIONS
Closed CaptionsOn if Mute
CC BackgroundGrayTV Contrast1
CHANNEL EDIT
AntennaANT-ASet Time12:00PMTV Sharpness0.5
Channel3Set DayEverydayTV Color0.5
MemoryDeletedDeviceAnt-ATV Tint0.5
NameN/AChannel3TV Color TempHigh
SQVN/ATV Video NoiseStandard
V-CHIP-LOCK
V-ChipOffTV VSM SharpnessOn
TV Rat ingTV -PG
FV- Fantasy ViolenceAllow
D-Sexual DialogAllow
L-Adult LanguageAllow
S-Sexual SituationsAllow
V-ViolenceAllow
Programs Not RatedAllow
Movie RatingPGA/V Memory ResetAnt-A
V-CHI P LOCK By Tim e
V-Chip Stop Time12:00AM
ADVANCED FEATURES
Black EnhancementOnTV Level SoundOff
TIMER
TimerOffTV Brightness0.5
AUDIO SETTINGS
VIDEO SETTINGS
TV Film Mode (Auto)Off
TV Volum e
PIP Source
PIP Position
POP Position
Format
PIP/POP Format
AUDIO/VIDEO
0.3
Ant-A Ch 3
Lower Right
Right Half
Stretch
Side by Side
Page 21
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Items in the table below are set to following after Initalization.
The “Power ON LED” provides an indication of the sets operation, and the possible cause of a malfunction.
A. Initial Control Circuitry Check
Immediately after the TV is connected to an AC power source:
• The LED flashes three times ... indicating the Microprocessor has initialized and is functioning
properly.
• If the LED does not flash ... the Microprocessor is NOT functioning.
B. Error Code Operational Check
Pressing the front panel “INPUT” and “MENU” buttons at the same time, and holding for 5 seconds,
activates the Error Code Mode. The LED flashes denoting a two digit Error Code, or indicating no problem
has occured since the last Initalization.
Note: The front panel buttons must be used, NOT those on the Remote Control.
• The number of flashes indicates the value of the MSD (tens digit) of the Error Code.
• The flashing then pauses for approximately 1/2 second.
• The LED then flashes indicating the value of the LSD (ones digit) of the Error Code.
• The Error Code is repeated a total of 5 times.
Example: If the Error Code is “24”, the LED will flash two times, pause, and then flash four
times.
C. Error Codes
The Error Code designations indicating a malfunction, or no malfunction, are listed below:
Except for the following, all adjustment items must be performed
using the remote hand unit.
• Lens Focus
• Electrostatic Focus
FUNCTIONCHASSIS
A. Activating the Circuit Adjustment Mode
1. Press the "MENU" button on a remote hand unit.
2. Press the number buttons "2", "2", "5", "7" in sequence.
The screen will change to the Adjustment Mode.
Note: Repeat steps 1 and 2 if the circuit
adjustment mode display does not appear
on screen
B. Selection of adjustment Functions and
Adjustment Items
To select an adjustment item in the circuit adjustment mode,
first select the adjustment function that includes the specific
adjustment item to be selected. Then, select the adjustment
item.
Refer to the following pages for the listing of adjustment
functions and adjustment items.
1. Press the "AUDIO" button on a remote hand unit to
select an adjustment function. Each time the button
is pressed, the Function changes in the following
sequence:
Video ChrDefl Jung
Video ChrV20
MODEMode 0NTSCSIGNAL
ITEM#
1SCT55
ABBREV.DATA
VIDEO
AUDIO
FUNCTIONS
2. Press the “VIDEO” button to select a specific
C. Changing Data
After selecting an adjustment Item, use the “ADJUST
UP/DOWN” button to change data.
•Press “ADJUST DOWN” to decrease the data value.
•Press “ADJUST UP” to increase the data value.
HRSub MatrMain Matr
Adjustment Item. The Item number increases each
time the “VIDEO” button is pressed.
Page 23
ENTER
ADJUST
UP/DN
MENU
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
A
D. Saving Adjustment Data
Press “ENTER” to save adjustment data in memory. The character display turns red for
approximately one second in this step.
Note: If the circuit adjustment mode is terminated without pressing “ENTER”, changes
in adjustment data are not saved.
E. Terminating the Circuit Adjustment Mode
Press the “MENU” button on the remote hand unit twice to terminate the adjustment mode.
Note: The circuit adjustment mode can also be terminated by turning power OFF.
6.Convergence Adjustment Mode
The Convergence mode is used to perform raster geometry correction, and convergence adjustments as
specified in Adjustment Procedures 15 through 18.
A. Convergence Mode Activation
1.Press MENU-2-2-5-9
2.When the Convergence Mode is activated, the display at
the right appears on a Green Crosshatch.
SDCoarse BLUE
1HST
Coarse Conv. Display
-50
B. Selecting the HD or SD Mode
1.Select the Signal Source before entering the Convergence Mode, either an NTSC or HD source.
2.Enter the Convergence Mode (MENU-2-2-5-9)
• If the signal source is NTSC, the SD mode is activated.
• If the signal source is HD 1080i, the HD mode is activated.
3.Activating the HD mode when no HD signal is available.
• Activate the Factory Option Menu (MENU-2-2-7-0)
• Use the “Adjust” keys to select “DTV Port” and press “Enter” to change the setting to “1080i”.
Sequence = “Auto”-”480i”-480-p”-”1080i”. Ignore any loss of sync while changing modes.
• Exit the Option Menu (Press “MENU” twice).
• Select the DTV Inputs as the signal source (INPUT button).
• Activate the Convergence Mode ... the Convergence mode will be in the HD mode and the internal
crosshatch is displayed.
4.After adjusting Convergence, be sure to set the DTV Port back to AUTO.
• Select an analog input as the signal source (INPUT button).
• Activate the Option Menu (MENU-2-2-7-0).
• Use the “Adjust” keys to select “DTV Port and press “Enter” to change the setting from “1080i” to
“AUTO”.
• Exit the Option Menu (Press MENU twice).
C. Convergence Mode Functions
In the Convergence Mode there are three main Functions (Categories).
• Pressing “6” activates CONV MISC
• Pressing “5” activates COARSE CONV
• Pressing “4” activates FINE CONV
D. CONV MISC (Press 6)
This mode is used to preset data values controlling the Convergence Generator, and to perform the HV
Regulation adjustment.
Page 24
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
1.Use the VIDEO button to select an item.
2.Use the ADJUST buttons to change data.
Note: When Item “1 HVOL” is selected the screen goes black except for the data display.
This occurs since a black screen is required when making the HV Regulation adjustment.
E. COARSE CONV (Press 5)
There are four Sub Functions in the Coarse mode, COARSE GREEN, COARSE RED, COARSE BLUE and
DF.
• COARSE GREEN .... used to make Coarse Raster Geometry Adjustments.
• COARSE RED ... used to make Coarse Red Convergence Adjustments.
• COARSE BLUE ... used to make Coarse Blue Convergence Adjustments.
• DF ... used to preset data values controlling the Dynamic Beam Focus circuit drive signal.
1.Use AUDIO button to select a Sub Function
2.Use the VIDEO button to select an Adjustment Item.
3.Use the ADJUST buttons to change data.
F. FINE CONV (Press 4)
Sub Functions
This mode is used to perform Fine Raster Correction, and Fine Red and Blue Convergence Adjustments.
There are three Sub Adjustment Functions, selected with the AUDIO button:
• FINE GREEN .... a Green Crosshatch is displayed, for Fine Raster Corrections.
• FINE RED .... a White Crosshatch is displayed, for Fine Red Convergence Adjustments.
• FINE BLUE .... a White Crosshatch is displayed, for Fine Blue Convergence Adjustments.
Cursor
In the Fine mode a Cursor is added to the Crosshatch. The ENTER button toggles the Cursor between two
modes:
• MOVE (blinking Cursor) .... use the ADJUST buttons to select any of 64 points on the Crosshatch.
• ADJUST (Non blinking Cursor) .... the ADJUST buttons adjust the active color at the current Cursor
position, horizontally or vertically.
Page 25
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Cursor Coordinates
Specific intersections in the Crosshatch are assigned vertical and horizontal coordinates.
These are shown in the preceeding diagram. The Cursor can only be moved to those positions that
have coordinates assigned. If the Cursor is at coordinates outside the screen area, the Cursor will not be
visible. Use the ADJUST buttons to move the Cursor to an intersection on the screen.
Display
The on-screen display changes in the Fine mode, as shown below.
The display shows the vertical and horizontal data for the current
Cursor Position, and the horizontal and vertical coordinates for
that position.
Horiz.H Coord. V Coord.Vert.
DataData
SDFine RED
13H1 V3-32
F. Saving Data and Exiting the Convergence Mode
Press MENU twice to exit the Convergence mode, data is automatically saved.
Note: If power is interrupted prior to properly exiting the Convergence Mode, changes in adjustment
1 HSTA Horiz. Position00000000
2VSTAVert.Position 00000000
3SKEWSkew(Yaxis) 00000000
4 TILT Tilt (Xaxis)50000000
5HWIDWidth0 10 5 5 20 20 0 0
6 HLIN Hori z. Li nearit y001515001010
7SPCCSidePCCorr. 00000000
8 HKEY Horiz . Keys tone 0170001700
9 TBPC Top/Bot t om PC -200 -169 -150 -150 -180 -190 -200 -170
10 VKEY Ver t. Key stone0140200101510
11 VWID Height1117403020303030
12 VLI N Vert . Linear it y00000000
COARSECONV RED (MENU-2-2-5-9-5)
# Abbrev. Description
1HSTAHoriz.Position 5050505050505050
2VSTAVert.Position 00000000
3SKEWSkew(Yaxis) 00000000
4 TILT Tilt (Xaxis)00000000
5 HLIN Hori z. Li nearit y -195 -170 -140 -125 -150 -170 -150 -150
6HWIDWidth2230500000
7 VKEY Vert . Keys tone - 100 -8515 -87 -70 -90 -90 - 70
8 VWI D Hei ght016000000
9 VLIN Vert . Li nearit y0000202000
10 TBPC Top/Bot tom PC -200 -169 -150 -150 20202020
11 SDBW Si de Bow000030303030
5 HLIN Hori z. Li nearit y 190 165 150 160 160 175 160 150
6HWIDWidth-14-25-20-30 0 0 0 0
7 VKEY Vert . Keys tone 100 90757575809065
8 VWI D Hei ght00-20 -200000
9 VLIN Vert . Li nearit y00000000
10 TBPC Top/Bot tom PC000002000
11 SDBW Si de Bow0000- 30 -30 -30 - 30
WS-A48VS-A50WS-A65WS-A55
SD HD SD HD SD HD S D HD
DF (MENU-2-2-5-9-5)
Item Abbr.48/55/65 Inch50 Inch
0DFH-220-220
1DFV-100-140
Page 28
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Adjustment Test Point Location
Page 29
Test Points
DT pin 3 - HV Adjust
DT pin 6 - Ground
DT pin 7 - 12 Volts
DT pin 8 - ACL
JA pin 17 - Main Picture (Y)
JA pin 21 - Main Color (Pr)
JB pin 1 - Sub Picture (Y)
JB pin 3 - Sub Picture (Cr)
TP6(R, G or B) - CRT Cathode
[HV Circuit]
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Purpose:
To set the CRT Anode voltage.
1. HV Regulation
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
DC Voltmeter
DT connector pins 3 & 6
------
-------
Video Signal
Monoscope
Video Input
Symptom:
Note:
This adjustment must be rechecked following Adjustment 9 CRT Cutoff.
Dark Picture
1. Supply a video monoscope signal.
2. Set Contrast to maximum, and Brightness to mid position.
3. Connect a DC volt meter between pins 3 and 6 of the DT connector.
(Positive lead to pin 3)
4. Activate the Conv-Misc Mode.
5. Select Item “1 HVOL” (screen goes black).
6. Adjust Item “1 HVOL” for 15.4V ±0.05V on the meter.
7. Save data and exit the Conv-Misc mode.
8. Confirm that the voltage does not change more than 0.15V.
Note:
This adjustment must be performed if E2RESET or Convergence E2RESET
are activated.
CONVERGENCE MODE
Activate ……..MENU-2-2-5-9
Misc. ……………….……"6"
Coarse………………..…."5"
Fine ……………………..."4"
Color (R,G or B)……AUDIO
Item No………….…..VIDEO
Adjust/Move……….ADJUST
Cursor Toggle….…..ENTER
Save & Exit…..MENU (twice)
[Video Circuit]
2. Main/Sub Y Level
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
Oscilloscope
JA Connector pin 17
JB Connector pin 1
------
-----Color Bars
Video Input
Purpose
Symptom:
To set picture luminance
Excess or insufficient brightness.
1. Supply a color bar signal to a Video Input (not an RF input).
2. Select the color bar signal for both the main and sub pictures.
3. Connect the oscilloscope to connector JA pin 17 (Main-Y).
4. Activate the Adjustment Mode
5. Select Item “3 YDRM” in the Main Matrix function.
6. Adjust the data so the Main-Y signal is between 0.71 Vp-p max. and 0.66 Vp-p
min. at JA pin 17.
(If it cannot be adjusted within this range, set to the lower value)
7. Move the oscilloscope to connector JB pin 1 (Sub-Y).
8. Select Item “3 YDRS” in the Sub Matrix function.
9. Adjust the data to equal the MAIN-Y Gain (+0.0V -0.1V).
CIRCUIT ADJUST MODE
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
Page 30
[Video Circuit]
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Purpose:
To match the sub picture color to that of the main picture.
3. Main/Sub Color Level
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CIRCUIT ADJUST MODE
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
Oscilloscope
JA pin 21
JB pin 3
------
------
Color Bars
Video
Symptom:
Main and sub pictures colors differ.
1. Supply an NTSC signal to an External Video Input.
2. Select the NTSC signal as the source for both the main and sub pictures.
3. Connect an oscilloscope to connector JA pin 21 (Main PR).
4. Activate the Adjustment mode.
5. Select Item “2 COLM” in the Main Matrix Function.
6. Adjust data so the PR signal is 0.71 Vp-p max. - 0.66 Vp-p min
(If it cannot be adjusted within this range, set to the lower value)
7. Connect an oscilloscope to connector JB pin 3 (Sub PR).
8. Select item “2 COLS” in the Sub Matrix Function.
9. Adjust so Sub PR = Main PR.
[CRT Circuit]
4. CRT Cutoff
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CIRCUIT ADJUST MODE
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
Oscilloscope
TP6R, TP6G, TP6B
------
50V/Div. 2msec/Div.
None
Video Input
Purpose
Symptom:
Note:
Use the Expand mode (full screen)
To set the cutoff point for all three CRTs.
Monochrome has a color tint, or incorrect brightness.
1. Select an External Input with no signal.
2. Enter the Adjustment Mode, Video Chroma Function.
3. Press “1”, automatically blanks the screen and sets COL to 0.
4. Set the data to the values given in the table below.
5. Connect the oscilloscope to TP6R.
6. Adjust the Red Screen VR so the black level is 170V, as shown below, or
198.5V ±1VDC using an DC Voltmeter.
7. Repeat Steps 4 and 5 to set the Blue and Green Screen VRs, using
TP6G and TP6B.
Note:
White Balance must be performed after this adjustment.
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
DC Voltmeter
------
------
------
NTSC White Raster
RF or Video
CIRCUIT ADJUST MODE
Symptom:
Note:
Use the “FORMAT” button to activate the Expand mode (full screen).
Monochrome has a color tint.
1. Supply a full White Raster Signal
2. Activate the Service Mode, Video Chroma Function.
3. Set the data for Item “19 COL” to 0.
4. Adjust Items “4 RDRH” and “6 BDRH” for optimum white at the center of
the screen.
5. Reduce the input luminance level to 25%.
6. Adjust Items “7 CTRH” and “9 CTBH” for optimum white.
7. Insert a Milliammeter in series with each CRT Cathode. The maximum
allowable current for each CRT is given in the table below.
8. Set the white raster to 100% and adjust Items “10 RDRL” and “12 BDRL” for
optimum white at the center of the screen.
9. Reduce the luminance level to 25%.
10. Adjust Item “13 CTRL” and “15 CTBL” for optimum white.
11. Set the data for Item “19 COL” back to 31.
Maximum CRT Current
CRT
RED580 uA900 uA
GREE N580 uA900 uA
BLUE580 uA900 uA
ALL BUT 73"
CURRENT
73"
CURRENT
[CRT Circuit]
6. White Balance (HD)
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CIRCUIT ADJUST MODE
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
-----
-----
------
-----
HD White Raster
DTV Inputs
Purpose
Symptom:
To set the CRTs white level in the HD mode.
Monchrome pictures have a color tint.
1. Supply an HD Full White Raster signal to the DTV Inputs.
2. Select the DTV Inputs (Input button)
3. Activate the Adjustment mode, Video Chroma Function.
4. Set Item “19 COL” to 0.
5. Adjust Items “4 RDRH” and “6 BDRH” for optimum white at the center of the
screen.
6. Reduce the input signal luminance to 25%.
7. Adjust Items “7 CTRH” and “9 CTBH” for optimum white.
8. Set the white raster to 100% and adjust Items “10 RDRL” and “12 BDRL” for
optimum white at the center of the screen.
9. Reduce the luminance level to 25%.
10. Adjust Item “13 CTRL” and “15 CTBL” for optimum white.
11. Set the data for Item “19 COL” back to 31.
Page 32
[Video Circuit]
7. Black Level
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Purpose:
Symptom:
To set the black level of the picture.
Excess or insufficient brightness.
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CIRCUIT ADJUST MODE
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
-----
-----
------
------
Monoscope
Video Input
1. Supply a Monoscope signal to a Video Input.
2. Activate the Adjust Mode, Video Chroma Function.
3. Adjust Item “2 SBRT” so the 0% and 10% black levels on the gradation scale
are the same.
4. Press ENTER to save data.
7. Exit the Service Mode.
40% 30% 20% 10%
50% 0%0%0%
60% 70% 80% 90%
GRADATION SCALE
[Video Circuit]
8. Sub Contrast
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
DC ma meter
DT connector pins 7 & 8
------
-----
Grayscale
RF Input
Purpose
Symptom:
To set overall beam current to its’ optimum level.
Excess or insufficient contrast.
Note: Activate the Expand mode (full screen).
1. Supply a Grayscale signal to a RF Input.
2. Activate the Adjust Mode, Video Chroma Function.
3. Select Item “1 SCT”, signal level automatically reduces.
4. Connect a 3ma DC meter between DT connector pins 7 and 8. Positive lead to
pin 7.
5. Adjust Item “1 SCT” for 630µA ±10µA (690µa ±10µa on the WS-73411).
6. Remove the meter.
7. Save data and Exit the Service Mode.
CIRCUIT ADJUST MODE
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
Page 33
[Focus Circuit]
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Purpose:
To improve edge focus.
9. Dynamic Focus Preset
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
Activate ……..MENU-2-2-5-9
Misc. ……………….……"6"
Coarse………………..…."5"
Fine ……………………..."4"
Color (R,G or B)……AUDIO
Item No………….…..VIDEO
Adjust/Move……….ADJUST
Cursor Toggle….…..ENTER
Save & Exit…..MENU (twice)
-----
-----
------
-----
Monoscope
Video Input
CONVERGENCE MODE
Symptom:
1. Supply a Monoscope signal to a Video Input
2. Activate the Convergence Mode.
3. Select the DF Function under the Conv. Coarse Mode.
4. Set Items “0 DFH” and “1 DFV” to the data values given in the DF Table.
5. Press “6” to activate CONV-MISC
6. Set “0 FPHS” and “1 DPHS” to data values given in the CONV-MISC Table.
5. Exit the Conv. Mode.
Poor focus at the edges of the screen.
DF
(MENU-2-2-5-9-5)
ItemAbbr.48/55/65/73 Inch50/60 Inch
0DFH-220-220
1DFV-100-140
CONV MISC
(MENU-2-2-5-9-6)
ItemAbbr.All Models
9DPHS1
10DOFS34
[Video Circuit]
10. Lens Focus
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
-----
------
------
-----
Monoscope
Video Input
Purpose
Symptom:
Note:
To set the Lens position for optimum focus.
Poor focus
This adjustment must be done before Electrostatic Focus. Perform this
adjustment for RED, GREEN, and BLUE monochrome pictures.
1. Supply a VIDEO signal (Monoscope).
2. Cover the Red and Blue Lens (producing a green raster).
3. Adjust the Green Lens for best focus at the center of the Monoscope pattern.
Note:
Attach a white paper to the
screen center. During adjustment,
observe the picture on the screen
from inside for easier adjustment.
4. Repeat Steps 2 and 3 for the Red
and Blue monochrome pictures.
Page 34
[CRT Circuit]
11. Electrostatic Focus &
(Alignment Magnet)
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Purpose:
Symptom:
To set electrostatic focus to the optimum point.
Poor focus.
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
-----
-----
------
------
Monscope & Crosshatch
Video Input
Note:
This adjustment must be performed after the Sub Contrast adjustment.
Alignment Magnet Adjustment (WS-55411, WS-656411 and WS-73411 Only)
This adjustment must be performed before Static Focus Adjustment
1. Supply a Crosshatch with Center Dot signal to a Video Input.
2. Select a Green raster using the table below.
3. Roughly adjust Green Focus VR.
4. Rotate Green Focus VR CCW so the center dot is about 10mm diameter.
5. Adjust the Green 4 Pole Magnet for the roundest center dot.
6. Set the Green Focus VR for optimum focus.
7. Repeat the procedure with a Red raster and adjust the Red 4 Pole Magnet.
8. Use silicon to lock the magnets in place.
Static Focus Adjustment (All Models)
1. Supply a Monoscope signal to a Video Input
2. Activate A/V Reset
3. Select Red, Green or Blue rasters using the table below.
3. Set the Red, Green and Blue Focus VRs for optimum focus at the top center of
the picture..
Raster Color Selection
Color RasterActivation Code
RedMENU-2-2-5-9-1
GreenME NU-2-2-5-9-2
BlueMENU-2-2-5-9-3
[On Screen Display]
12.Character Position
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
-----
-----
------
------
Video Signal (HD/NTSC)
ANT-A/DTV
Purpose
Symptom:
To position the character display horizontally.
Incorrect display position
1. Supply a Monoscope signal to the Video or RF Input.
2. Select the Monoscope as the source for the main picture (Input button).
3. Activate the Service Mode, HR Function.
4. Use the Adjust Right/Left buttons to center the display horizontally.
(A = B)
5. Save data and exit the Service Mode..
Page 35
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
[Conv/Defl]
13. Geometry Preset
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
-----
------
------
-----
NTSC & HD
Video & DTV Inputs
Purpose:
Symptom:
Note:
This procedure is usually only necessary if an E2PROM is replaced in the TV
To preset data controlling raster geometry
Raster distortion.
Control or Convergence circuits.
Procedure
In the Circuit Adjustment and Coarse Convergence Modes pre-set the data to the
values given in the Tables below.
Activate …….. MENU-2-2-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
-----
-----
------
-----
Monoscope (NTSC & HD)
Video & DTV Inputs
Purpose:
Symptom:
To set the height, width and linearity of the raster.
Incorrect height, width and/or linearity.
Preliminary:
1. DO NOT change the initial values for “#8 VLIN” in the Defl. Jungle Function.
2. DO NOT exceed the following VHGT adjustment ranges:
NTSC ... from -4 to +10
HD ... from -10 TO +5
NTSC Mode
1. Supply an NTSC Monoscope signal to a Video Input.
2. Select the Monoscope as the signal source.
3. Activate the Adjustment Mode, JNGL Function.
4. Select and adjust each of the following items.
• “7 VHGT” ... so the vertical marker sum = 4
• “1 HWD” ... so the horizontal marker sum = 7
5. Save data and Exit the Service Mode.
HD Mode
1. Supply an HD Monoscope signal to the DTV HD Inputs.
2. Select the DTV Inputs as the signal source (Input button)
3. Activate the Service Mode, Defl. Jungle Function.
4. Select and adjust each of the following items.
• “7 VHGT” ... so the vertical marker sum = 2
• “1 HWD” ... so the horizontal marker sum = 5
5. Save data and Exit the Service Mode.
Page 37
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
[Convergence Circuit]
15. Convergence Geometry
Adjustment
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CONVERGENCE MODE
Activate ……..MENU-2-2-5-9
Misc. ……………….……"6"
Coarse………………..…."5"
Fine ……………………..."4"
Color (R,G or B)……AUDIO
Item No………….…..VIDEO
Adjust/Move……….ADJUST
Cursor Toggle….…..ENTER
Save & Exit…..MENU (twice)
-----
------
------
-----
NTSC -- None
HD -- HD sync
Video & DTV Inputs
Purpose:
Symptom:
Note:
Deflection Circuit Geometry must be performed before this adjustment.
NTSC mode
1. Select a Video Input with no signal.
2. Activate the Convergence Mode, Coarse Green.
3. Adjust the Coarse Green Items shown below for straight crosshatch lines.
4. Select the Fine Green Mode, a Cursor is displayed on the crosshatch.
5. Use the Cursor to adjust for straight crosshatch lines.
6. Exit the Convergence Mode.
HD mode
1. Supply horizontal and vertical HD sync to the DTV Inputs and select the DTV
Inputs as the source.
Note: I
To set the Convergence circuit geometry adjustments.
Raster distortion at the top, bottom or sides of the picture.
f an HD signal is not available, use the Conv. HD with No Signal
Procedure
2. Enter the Convergence Mode, Coarse Green.
3. Repeat NTSC Steps 3 through 6 in the HD mode.
CONV. HD WITH NO SIGNAL
1. MENU-2-2-7-0
2. Set DTV Port to 1080i
3. MENU (Twice)
4. INPUT select DTV inputs
5. MENU-2-2-5-9
After Adjusting, set the
DTV Port to AUTO
Page 38
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
[Convergence Circuit]
16. Centering and Static
Convergence
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CONVERGENCE MODE
Activate ……..MENU-2-2-5-9
Misc. ……………….……"6"
Coarse………………..…."5"
Fine ……………………..."4"
Color (R,G or B)……AUDIO
Item No………….…..VIDEO
Adjust/Move……….ADJUST
Cursor Toggle….…..ENTER
Save & Exit…..MENU (twice)
-----
-----
------
-----
NTSC -- Monoscope
HD -- Monoscope
Video & DTV Inputs
Purpose:
Symptom:
To converge red, green and blue at the center of the screen
Color edging over the entire picture.
Preliminary
Degauss the shield cover and bracket unit of the CRT assembly and chassis.
DO NOT degauss the CPM Assemblies.
HD mode
1. Supply an HD Monoscope signal to the DTV Inputs.
2. Select the DTV Inputs as the signal source (Input button).
3. Enter the Convergence Coarse mode.
4. Set the data for the “HSTA” and “VSTA” items to:
GREENREDBLUE
HSTA = 0HSTA = 50HSTA = -50
VSTA = 0VSTA = 0VSTA = 0
5. In the Coarse Green mode:
• Center the Green Raster using the Green Centering Magnet.
• Rotate the Green Deflection Yoke to correct any tilt.
6. In the Coarse Red mode, use the Red Centering Magnet to converge
red on the green at the center of screen. Correct any red tilt with the Red
Deflection Yoke.
7. In the Coarse Blue mode, repeat Step 6 using the Blue Centering magnet and
the Blue Deflection Yoke.
8. Exit the Convergence mode.
SD mode
1. Supply an NTSC Monoscope signal to a Video Input.
2. Select the Monoscope as the signal source (Input button).
3. Enter the Convergence Coarse Green mode.
4. If needed, center the green raster using “1 HSTA” and “2 VSTA” adjustments.
5. In the Coarse Red mode, use “1 HSTA” and “2 VSTA” adjustments to converge
the red on the green at the center of the screen.
6. In the Coarse Blue mode, repeat step 5 to converge the blue of the green.
7. Exit the Convergence Mode
Page 39
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
[Convergence Circuit]
17. Coarse Convergence
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
CONVERGENCE MODE
Activate ……..MENU-2-2-5-9
Misc. ……………….……"6"
Coarse………………..…."5"
Fine ……………………..."4"
Color (R,G or B)……AUDIO
Item No………….…..VIDEO
Adjust/Move……….ADJUST
Cursor Toggle….…..ENTER
Save & Exit…..MENU (twice)
-----
------
------
-----
NTSC -- None
HD -- HD sync
Video & HD Inputs
Purpose:
Symptom:
SD mode
1. Select an External Input with no signal.
2. Activate the Convergence Mode, Coarse Red.
3. Adjust the Items shown below to converge the red on the green.
4. Select Coarse Blue mode.
5. Adjust the Items shown below to converge the blue on the green.
Note:
To converge red and blue on green at the edges of the
screen.
Color edging at the top, bottom and sides of the screen.
If center convergence shifts, use red and blue Items “0 HSTA” and
“1 VSTA” to correct the shift.
6. Exit the Convergence Mode.
HD mode
1. Supply horizontal and vertical HD sync to the DTV Inputs and select the DTV
Inputs as the source.
Note: I
f an HD signal is not available, use the Conv. HD with No Signal
Procedure.
2. Repeat SD Steps 2 through 5 in the HD mode.
3. Exit the Convergence mode.
CONV. HD WITH NO SIGNAL
1. MENU-2-2-7-0
2. Set DTV Port to 1080i
3. MENU (Twice)
4. INPUT select DTV inputs
5. MENU-2-2-5-9
After Adjusting, set the
DTV Port to AUTO
Page 40
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
[Convergence Circuit]
18. Fine Convergence
Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
Activate ……..MENU-2-2-5-9
Misc. ……………….……"6"
Coarse………………..…."5"
Fine ……………………..."4"
Color (R,G or B)……AUDIO
Item No………….…..VIDEO
Adjust/Move……….ADJUST
Cursor Toggle….…..ENTER
Save & Exit…..MENU (twice)
-----
-----
------
-----
NTSC -- None
HD -- HD sync
Video & DTV Inputs
CONVERGENCE MODE
Purpose:
Symptom:
To converge red, green and blue at the edges of the screen
Color edging at the edges of the picture.
SD Fine Adjustment
1. Select an External Input, no signal.
2. Activate the Convergence Mode, Fine Red.
3. Use the Cursor to converge red on the green.
4. Select the Fine Blue mode.
5. Use the Cursor to converge blue on the green.
6. Exit the Convergence mode.
HD Fine Adjustment
1. Supply an HD signal (sync only) to the DTV inputs and select DTV with the
“Audio” button.
Note: I
f an HD signal is not available, use the Conv. HD with No Signal
Procedure.
2. Repeat SD Fine Adjustment Steps 2 through 6, in the HD mode.
CONV. HD WITH NO SIGNAL
1. MENU-2-2-7-0
2. Set DTV Port to 1080i
3. MENU (Twice)
4. INPUT select DTV inputs
5. MENU-2-2-5-9
After Adjusting, set the
DTV Port to AUTO
Page 41
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
CHIP PARTS REPLACEMENT
Some resistors, shorting jumpers (0 Ohm resistors),
ceramic capacitors, transistors and diodes are chip parts.
The following precautions should be taken when replacing
these parts.
Cautions:
1.Use a fine tipped, well insulated soldering iron
(approximately 30 watts), and tweezers.
2.Melt the solder and remove the chip parts
carefully so as not to tear the copper foil from
the printed circuit board.
3.Discard removed chips; do not reuse them.
4.Do not apply heat for more than 3 (three)
seconds to new chip parts.
5.Avoid using a rubbing stroke when soldering.
6.Take care not to scratch, or damage the chip
parts when soldering.
7.Supplementary cementing is not required.
Chip Parts Removal (Resistors, Capacitors, etc.)
1.Grasp the part with tweezers. Melt the solder
at both sides alternately, and remove one side
of the part with a twisting motion.
2.Melt the solder at the other side and remove
the part.
Chip Parts Removal (Transistors)
1.Melt the solder of one lead and lift the side of
that lead upward.
2.Simultaneously melt the solder of the other
two leads and lift the part from the PCB.
Replacement
1.Presolder the contact points on the circuit
pattern.
2.Press the part downward with tweezers and
apply the soldering iron as shown.
PAGE 42
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
REPLACEMENT PARTS
Parts Ordering
To expedite delivery of replacement parts orders, specify the following:
1. Model Number/Serial Number
2. Part Number and description
3. Quantity
Note: Unless complete information is supplied, delay in processing of orders will result.
Critical and Warranty Parts Designation
Critical Electrical Components are indicated by Bold Type in the Parts List, and in the schematic
diagrams by shading.
Warranty Return Parts are indicated in the Parts List with an (*).
Parts Tolerance Codes
Refer to the following chart for tolerance characteristics of electrical components.
MARKBCDFGJK
Tolerance %± 0.1± 0.25± 0.5± 1± 2± 5± 10
MARKMNVXZPQ
Tolerance %± 20± 30± 10
+40
-20
+80
-20
+100
-0
+30
-10
MARKMNVXZ
Tolerance (pF)± 0.1± 0.25± 0.5± 1± 2
Replacement Part Notes
When Replacing the RF-Switch (RF-SW) or the PCB-SIGNAL:
1. Remove the PLATE-RF SW from the original component,
shown in the diagram at the right.
2. Install the PLATE-RF SW on the new RF-SW.
When Replacing the EEPROM
The EEPROMs (IC7C01, IC2K02 and IC8D0) store the adjustment data. After replacing the EEPROM, readjust the
data to the values given in the tables on pages 28 to 30. If good performance is not obtained with these values,
perform the Adjustment Procedure(s) given in the Description and Adjustment columns.
330P276030DEFL-YOKEVS-A50
330P276040DEFL-YOKEWS-A48 / WS-A55
330P276050DEFL-YOKEWS-A65
453B036010CAP-ANOD - SHORT - RED
453B036020CAP-ANODE - LONG - G&B