Mitsubishi Electric WT-42311 User manual

marik08
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2002 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
MITSUBISHI ELECTRIC
Service
Manual
20022002
20022002
2002
• Weight and dimensions shown are approximate.
• Design specifications are subject to change without notice.
PROJECTION TELEVISION
VK20 CHASSIS
SPECIFICATIONS
• Power : AC 120V, 60Hz
240W
• Frequency : VHF 54 ~ 470MHz
Range UHF 470 ~ 806MHz
•Antenna Input : VHF/UHF 75Ω unbalanced
•CRT Size : [7 inches]
•High Voltage : 32.0kV (at 0A)
•Cabinet : 39"(W)x34"(H)x25"(D)
Dimensions
•Weight : 105 lbs
• Speaker : Two 5" round, full range (8Ω5W)
• Input Level : VIDEO IN JACK (RCA Type)
1.0Vp-p 75Ωunbalanced
: AUDIO IN JACK (RCA Type)
-4.7dBm 43kΩunbalanced
: S-VIDEO IN JACK (Y/C separate)
Y=1.0 Vp-p C=0.286Vp-p(BURST)
75Ωunbalanced
: COMP / Y, Cr, Cb (RCA Type)
Y=1.0 Vp-p. Cr, Cb=700mVp-p
: ATV / Y(G), Pr(R), Pb(B), H, V
Y 1.0Vp-p with sync 75Ω(RCA Type)
Pr, Pb: 700mV 75Ω
H, V: 3.0Vp-p 75Ω
• Output Level : VIDEO OUT JACK (RCA Type)
1.0Vp-p 75Ωunbalanced
: AUDIO OUT JACK (RCA Type)
-4.7dBm 4.7kΩunbalanced
WT-42311
WT-A42

marik08

marik08
MODELS: WT-42311 / WT-A42
Page 3
INTRODUCTION ................................................................................................................................5
PRODUCT SAFETY NOTICE ............................................................................................................. 5
SAFETY PRECAUTIONS ................................................................................................................... 6
CABINET DISASSEMBLY
Front View Disassembly ................................................................................................................. 7
Rear View Disassembly .................................................................................................................. 8
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
Lenticular Screen and Fresnel Lens Removal .................................................................................. 9
Lenticular Screen and Fresnel Lens Installation .............................................................................. 9
SERVICING PCBs
Accessing the Main Chassis ........................................................................................................ 10
PCB Locations.............................................................................................................................. 11
Main Components Location........................................................................................................... 11
CRT REPLACEMENT
Second Anode Lead Removal ....................................................................................................... 12
CRT Removal ................................................................................................................................12
CRT Installation ............................................................................................................................ 23
ELECTRICAL ADJUSTMENTS
Test Equipment ............................................................................................................................. 15
Initial Setup ................................................................................................................................... 16
LED Indicator Diagnostics ............................................................................................................. 17
Circuit Adjustment Mode............................................................................................................... 18
Convergence Adjustment Mode ..................................................................................................... 19
Adjustment Items List ................................................................................................................... 21
Adjustment Test Points ................................................................................................................. 24
Adjustment Procedures
High Voltage Regulation ....................................................................................................... 25
Main/Sub Y Level ................................................................................................................. 25
Main/Sub Color Level ........................................................................................................... 26
CRT Cutoff ........................................................................................................................... 26
White Balance (NTSC) ......................................................................................................... 27
White Balance (HD) ............................................................................................................. 27
Black Level .......................................................................................................................... 28
Sub Contrast ....................................................................................................................... 28
Dynamic Focus Preset ........................................................................................................ 29
Lens Focus .......................................................................................................................... 29
Electrostatic Focus.............................................................................................................. 30
On Screen Display Character Position ................................................................................. 30
Deflection/Convergence Geometry Presets .......................................................................... 31
Deflection Circuit Geometry Adjustments ............................................................................. 32
Convergence Circuit Geometry Adjustments ........................................................................ 43
Centering and Static Convergence ....................................................................................... 34
Coarse Convergence Adjustments ....................................................................................... 35
Fine Convergence Adjustments ............................................................................................ 36
CHIP PARTS REPLACEMENT ......................................................................................................... 37
CONTENTS

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REPLACEMENT PARTS
Parts Ordering .............................................................................................................................. 38
Critical and Warranty Parts Designation........................................................................................ 38
Parts Tolerance Codes .................................................................................................................. 38
Replacement Part Notes
When replacing the RF-Switch or PCB-SIGNAL ................................................................... 38
When replacing the EEPROM.............................................................................................. 38
Quick Reference List .................................................................................................................... 39
Service Parts List.......................................................................................................................... 40
Screen Parts List .......................................................................................................................... 51
CIRCUITRY BLOCK DIAGRAMS
Power Supply ............................................................................................................................... 52
Video / Color Signal Path .............................................................................................................. 53
Sync Signal Path .......................................................................................................................... 54
Deflection / HV.............................................................................................................................. 55
X-Ray Protect ............................................................................................................................... 56
HV Regulation ............................................................................................................................... 57
Sound Signal Path ........................................................................................................................ 58
Convergence ................................................................................................................................. 59
Control Circuitry ............................................................................................................................ 60
Section 2 .... Schematic Diagrams
SCHEMATIC DIAGRAMS
Overall Block Diagram ................................................................................................................... 1
PCB-MAIN ..................................................................................................................................... 2
PCB-POWER................................................................................................................................. 3
PCB-TERMINAL (Input Sw) ............................................................................................................. 4
PCB-TERMINAL (3DYC / Decoders) ............................................................................................... 5
PCB-SIGNAL-1 (AV I.O) .................................................................................................................. 6
PCB-SIGNAL-2 (Micro) ................................................................................................................... 7
PCB-SIGNAL-3 (VCJ) ..................................................................................................................... 8
PCB-SIGNAL-4 (Convergence Generator) ........................................................................................ 9
PCBs - FRONT / CONTROL / CRT / PREAMP ............................................................................. 10
PCB-DOUBLER-1 (Input) .............................................................................................................. 11
PCB-DOUBLER-2) (Main) ............................................................................................................. 12
PCB-DOUBLER-3 (Output) ........................................................................................................... 13
PCB LAYOUT DIAGRAMS ............................................................................................................... 14

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MODEL: WT-42311 / WT-A42
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INTRODUCTION
This service manual provides service instructions for PTV Models WT-42311and WT-A42 using the VK20 chassis.
Service personnel should read this manual thoroughly before servicing this chassis.
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 under-
standing 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.

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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 servic-
ing. 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.), particu-
larly 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).

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*Refer to PARTS LIST for Part Numbers
CABINET DISASSEMBLY(FRONT VIEW)
Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove the Board-Front by removing 3 screws "a".
3. Remove 3 screws “b”and then remove the Front Mask and Diamond Shield.
4. Remove 8 screws “c”and then the Assembly Screen.

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CABINET DISASSEMBLY(REAR VIEW)
Rear Cabinet Disassembly
1. Remove the Back Board by removing screws 7 "a".
2. Remove 6 screws "b" securing the Light Box Assembly.
3. Disconnect connector EJ.
4. Slide the Light Box Assembly out of the cabinet.

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SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
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.
1. Lenticular Screen and Fresnel Lens Removal
1. Remove the screen assembly as shown in the Cabinet Front Disassembly procedure.
2. Remove screws “a”from the bottom Corner Brackets.
3. Remove the Holder-Screen-Bottom.
4. Slide the Lenticular Screen and Fresnel Lens from the Assembly Screen as shown below..
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.
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 36.5 inches of double sided tape (Part # LENS-TAPE) along the top front edge of the Fresnel Lens.
2. Place the Fresnel Lens on top of the Lenticular Screen and apply pressure at the top edge to
bond them together as shown below.
3. Reverse the disassembly procedure to install the screens in the screen frame.

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MODEL: WT-42311 / WT-A42
SERVICING PCBs
Accessing The Main Chassis
In the VK20 chassis, the Main Chassis is located in front of the CRTs. Use the following procedure to access
the Main Chassis.
1) Remove the Light Box Assembly, refer to the Cabinet Rear Disassembly.
2) The shelf in the front of the Light Box Assembly is removable, refer to Figure 1.
3) Release the shelf lock. Apply pressure to the shelf lip on the right side (downward and towards the
front). Refer to Figure 2
4) Hold both sides of the shelf, pull forward and then upward to remove the shelf.

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MODEL: WT-42311 / WT-A42
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PCB Locations
Major Parts Locations

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MODEL: WT-42311 / WT-A42
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.
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 the CRTs
by shorting the open end of the respective high voltage cable to chassis ground.
1. Refer to Cabinet Disassembly and remove the Light Box Assembly.
2. Remove the three Anode Lead Wires from the Flyback transformer and discharge the CRTs. (Use the
above procedure)
3. Unplug the three PCB-CRTs.
4. Remove 4 screws "a" retaining the Optical Unit. [Figure 1]
5. Remove 4 screws "b" retaining the Lens of the respective CRT
6. Lift the Optical Unit from the Light Box and set it lens down on a flat surface.
7. Remove 4 screws "c" retaining the CRT. [Figure 2]
Note: DO NOT loosen the spring loaded screws. Doing so will break the seal between the
C-Element and the # 6 Lens, causing leakage of the CRT Coolant.
8. Remove the Deflection Yoke from the neck of the CRT. [Figure 3]
2) While holding the lead down rotate
the lead 90ºcounter clockwise.
3) Carefully remove the Anode Lead
from the Flyback Transformer.
Figure 1

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Figure 2
Note: The 4 spring-loaded screws shown
in Fig 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.
2. Installation of the CRT
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 4]
Figure 3
Figure 4

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MODEL: WT-42311 / WT-A42
1. Carefully position the replacement CRT and fasten in place using 4 screws "c". [Figure 2]
2. Install the Deflection Yoke on the CRT neck. [Figure 3]
3. Install the Lens that was removed in step 5 of Removal of the CRT.
a) Position the Lens so that the Lens Adjustment Set Screw faces the rear of the TV [Figure 5].
b) Install the Lens mounting screws “b”. [Figure 1]
4. Insert the Optical Unit into the Light Box Assemblyand secure it with 4 screws “a”[Figure 1]..
5. Plug in the PCB-CRTs.
6. Insert the Anode Lead Wires into the Flyback Transformer.
7. Re-clamp the Lead Wire in its original position.
Figure 5
Adjustment procedures after replacing the CRT(s)
•CRT Cut Off / White Balance Adjustment
•Static Convergence Adjustment
•Dynamic Convergence Adjustment

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1H
40%
40%
100%
75%
Monoscope Signal
Split-Field Color Bars (100% window)
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.

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MODEL: WT-42311 / WT-A42
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.
B. Default Settings
MENU-2-2-7-0
OPTION MENU
Initial
Power Restore :OFF
DTV Port :Auto
Direct Key Mode :OFF
Programs Not Rated Allow
Memorize channels ANT-A - Air Movie Rating PG A/V Memory Reset Ant-A
Language (idioma) English TV Speakers (Internal) On
Front Button Lock Off V-Chip Start Time 12:00AM Audio Output Variable
V-Chip Stop Time 12:00AM AUDIO SETTINGS
Clock Setting Auto Lock by Time Off TV Bass 50%
Time Zone Eastern Lock Time N/A TV Treble 50%
Daylight Savings Time Applies Unlock Time N/A TV Balance 50%
Clock Time N/A TV Surround Off
Set Day N/A Video Mute On TV Listen To Stereo
Black Enhancement On TV Level Sound Off
Closed Captions On if Mute Auto Color Correction Onn VIDEO SETTINGS
CC Background Gray TV Contrast 1
Timer Off TV Brightness 50%
Antenna ANT-A Set Time 12:00PM TV Sharpness 50%
Channel 3 Set Day Everyday TV Color 50%
Memory Deleted Device Ant-A TV Tint 50%
Name N/A Channel 3 TV Color Temp High
SQV N/A TV Video Noise Standard
Auto Color Correction Off TV Film Mode (Auto) Off
V-Chip Off TV VSM Sharpness On
TV Rating TV-PG Magenta 50% TV Volume 30%
FV- Fantasy Violence Allow Red 50% PIP Source Ant-A Ch 3
D-Sexual Dialog Allow Yellow 50% PIP Position Lower Right
L-Adult Language Allow Green 50% POP Position Right Half
S-Sexual Situations Allow Cyan 50% Format Stretch
V-Violence Allow Blue 50% PIP/POP Format Side by Side
V-CHIP-LOCK
COLOR BALANCE
MANUAL COLOR ADJ (WT-42311)
AUDIO/VIDEO
MAIN MENU DEFAULT SETTINGS
V-CHIP LOCK By Time
CHANNEL EDIT
ADVANCED FEATURES
TIMER
SETUP
CLOCK
CAPTIONS

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Page 17
Items in the table below are set to following after Initalization.
4. LED Indicator Diagnostics
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:
Error Code Description
12 No error has occurred.
21 X-Ray Protect circuit.
22 Short Protect circuit.
23 Horizontal Deflection failure.
24 Vertical Deflection failure.
A/V Memory Ant-A
Ant-B DTV NTSC 1/2/3
COMP.
1/2
Contrast Max Max Max Max
Brightness Mid Mid Mid Mid
Sharpness Mid Mid Mid Mid
Color Mid Mid Mid Mid
Tint Mid Mid Mid Mid
Color Temp. High High High High
Video Noise Stnd. Stnd. Stnd. Stnd.
Image type Video Video Video Video
TV VSM
Sharpness On On On On
Bass Mid Mid Mid Mid
Treble Mid Mid Mid Mid
Balance Mid Mid Mid Mid
Surround Off Off Off Off
Listen To Stereo N/A N/A N/A
Level Sound Off Off Off Off
AV Memory Initial Settings

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5. Circuit Adjustment Mode
Except for the following, all adjustment items must be performed
using the remote hand unit.
•Lens Focus
•Electrostatic Focus
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:
2. Press the “VIDEO”button to select a specific
Adjustment Item. The Item number increases each
time the “VIDEO”button is pressed.
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.
123
56
789
0
SQV QV
4
POWER
HOME
PAUSE
REC
FF/FWDREW/REV PLAY
STOP
VOLUME
INFO
CANCEL MENU
PIP/POP
PIP SIZE
PIP CH
INPUT
SLEEP
VIDEO
AUDIO
MUTE
CHANNEL
ENTER
PIP INPUT
EXCH
GUIDE
TV AUDIO
CABLE/DBS DVD
VCR
ENTER
VIDEO
AUDIO
ADJUST
UP/DN
MENU
FUNCTION CHASSIS
Video Chr V20
MODE Mode 0 NTSC SIGNAL
ITEM# 1SCT55
ABBREV. DATA
Video Chr Defl Jung
HR Sub Matr Main Matr
FUNCTIONS

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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.
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.
SD Coarse BLUE
1HST
A
-50
Coarse Conv. Display

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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.