Sony KV-PG14L70, PG14P40 Service Manual
REVISION HISTORY
BG-2T
CHASSIS
MODEL
KV-PG14L70
KV-PG14L70/H
KV-PG14P40
NO DATE DESCRIPTION OF REVISION
PA RT NO. : 9-872-262-01
SERVICE MANUAL
BG-2T
CHASSIS
MODEL COMMANDER DEST. CHASSIS NO.
KV-PG14L70 RM-952 ME SCC-U67E-A
KV-PG14L70/H RM-952 ME SCC-U67B-A
KV-PG14P40 RM-952 GE SCC-U69A-A
MODEL COMMANDER DEST. CHASSIS NO.
3
1
2
6
4
5
9
7
8
JUMP
÷
0
SOUND
PROGRÁ
MODE
FAVORITE
TV
TRINITRON
®
COLOR TV
KV-PG14P40/PG14L70/PG14L70/H
RM-952
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G
Color system PAL, PAL 60, NTSC3.58 (AV IN), NTSC4.43, SECAM KV-PG14L70
PAL, PAL 60, NTSC3.58(AV IN), NTSC4.43 KV-PG14P40
Channel coverage VHF: E2 to E12 / UHF: E21 to E69 /
CATV: S01 to S03, S1 to S41
˘ (Antenna) 75-ohm external terminal
Audio output (Speaker) 3W
Number of terminal
D Video Input: 2* Output: 1 Phono jacks; 1 VP-P, 75 ohms * One input line available
≥ Audio Input: 2* Output: 1 Phono jacks; 500 mVrms * One input line available
(Earphone) Output: 1 Monaural minijack
Picture tube 14 in.
Tube size (cm) 37 Measured diagonally
Screen size (cm) 34 Measured diagonally
Dimension (w/h/d, mm) 375 x 346 x 411
Mass (kg) 12
SPECIFICATIONS
Note
Design and specifications are subject to change without notice.
CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND
THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD,
OR CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
– 2 –
TABLE OF CONTENTS
KV-PG14P40/PG14L70/PG14L70/H
RM-952
Section Title Page
SELF DIAGNOSTIC FUNCTION ................................... 4
1. GENERAL ................................................................. 7
2. DISASSEMBLY
2-1. Rear Cover Removal ............................................... 10
2-2. Speaker Removal .................................................... 10
2-3. Chassis Assy Removal ............................................ 10
2-4. Service Position ...................................................... 10
2-5. Terminal Bracket Removal ..................................... 10
2-6. Replacement Of Parts ............................................. 10
2-6-1. Replacement Of Light Guide ....................... 10
2-6-2. Replacement Of Power Button .................... 10
2-7. Picture Tube Removal ............................................. 11
3. SET-UP ADJUSTMENTS
3-1. Beam Landing ......................................................... 12
3-2. Convergence ............................................................ 13
3-3. Focus Adjustment.................................................... 15
3-4. G2 (SCREEN) and white balance adjustments ...... 15
4. CIRCUIT ADJUSTMENTS
4-1. Adjustment With Commander ................................ 16
4-2. Adjustment Method ................................................ 16
4-3. Picture Quality Adjustment .................................... 21
4-4. Deflection Adjustment ............................................ 21
4-5. A Board Ajustment After IC003 (MEMORY)
Replacement ............................................................ 21
4-6. Picture Distortion Adjustment ................................ 22
Section Title Page
5. DIAGRAMS
5-1. Block Diagram ........................................................ 23
5-2. Circuit Boards Location .......................................... 25
5-3. Schematic Diagram ................................................. 26
(1) Schematic Diagram of A Board ........................ 27
(2) Schematic Diagram of C Board ........................ 29
5-4. Voltage Measurement ............................................. 31
5-5. Waveforms .............................................................. 33
5-6. Printed Wiring Boards and Parts Location ............. 34
5-7. Semiconductors ....................................................... 37
6. EXPLODED VIEWS
6-1. Picture tube and Chassis ......................................... 39
7. ELECTRICAL PARTS LIST.................................... 40
– 3 –
KV-PG14P40/PG14L70/PG14L70/H
RM-952
SELF DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp will automatically begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/
TIMER lamp flash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error
symptom cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in
memory to reveal past problems and how often these problems occur.
1. DIAGNOSTIC TEST INDICATORS
When an errors occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the possible cause of the
problem. If there is more than one error, the lamp will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.
Diagnostic
Item
Description
• Power does not
turn on
• +B overcurrent
(OCP)
• Horizontal
deflection
overdrive
• White balance
failure (no
PICTURE)
• Vertical deflection
stopped
• Micro reset
No. of times
STANDBY/TIMER
lamp flashes
Does not light
2 times
4 times
—
Self-diagnostic
display/Diagnostic
result
—
002:000 or
002:001~255
004:000 or
004:001~225
101:00 or
101:001~225
Probable
Cause
Location
• Power cord is not
plugged in.
• Fuse is burned out
F4601 (F)
• H.OUT Q801 is shorted.
(A board)
• -13V is not supplied.
(A board)
• IC 551 faulty (A board)
• Discharge CRT
(C Board)
• Static discharge
• External noise
Detected
Symptoms
• Power does not come on.
• No power is supplied to
the TV.
• AC power supply is faulty.
• Power does not come on.
• Load on power line is
shorted.
• Has entered standby state
after horizontal raster.
• Power line is shorted or
power supply is stopped.
• Vertical deflection pulse
is stopped
• Power is shut down
shortly, after this return
back to normal.
• Detect Micro latch up.
Note 1: If a + B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.
The symptom that is diagnosed first by the microcontroller is displayed on the screen.
Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.
– 4 –
2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT
2 times
KV-PG14P40/PG14L70/PG14L70/H
RM-952
Diagnostic Item Flash Count*
+B overcurrent/overvoltage 2 times
4 times
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec.
Lamp OFF 3 sec.
Vertical deflection stopped 4 times
* One flash count is not used for self-diagnostic.
STANDBY/SLEEP lamp
3. STOPPING THE STANDBY/TIMER FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER
lamp from flashing.
4. SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past occurances of failure for confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
[Screendisplay] / channel [5] / Sound volume [-] / Power ON
˘
Note that this differs from entering the service mode (mode volume [+]).
Self-Diagnosis screen display
SELF DIAGNOSTIC
002 : 000
004 : 000
101 : 000
Numeral "0" means that no fault has been detected.
– 5 –
KV-PG14P40/PG14L70/PG14L70/H
RM-952
5. HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic
screen during repairs. When you have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after
completion of the repairs.
[Clearing the result display]
To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the
diagnostic screen is being displayed.
Channel [8] / 0
[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
6. SELF-DIAGNOSTIC CIRCUIT
FROM
[+B] Q500
IC301
Y/CHROMA JUNGLE
MP/
50
PROTECT
8
SDA
[V]
D553
IC001
SYSTEM
IO-8DAT B-DAT
17
O-LED
54
IO-SDAT
53
51
IC003
MEMORY
5
[+BovercurrentªOCPº] Occurs when an overcurrent on the +B(135) line is detected by Q500. If Q500 go to
ON and the voltage to pin 50 of IC301 more than 3.5V when V.SYNC is more than
seven verticals in a period, the unit will automatically turn off.
[Verticaldeflectionstopped] Occurs when an absence of the vertical deflection pulse is detected by Pin 17 and
IC001 shut down the power supply.
[Whitebalancefailure] If the RGB levels* do not balance or become low level within 5 seconds, this error
will be detected by IC301. TV will stay on, but there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
– 6 –
KV-PG14P40/PG14L70/PG14L70/H
!
PROGR
SELECT
6
1
3
7
2
584
9
qa
qs
0
RM-952
A Getting Started
Step 1
b
b
SELECT
PROGR
SELECT
Insert the batteries (supplied) into the remote.
Note
• Do not use old batteries nor use different types of batteries
together.
Step 2
Connect the antenna cable (not supplied) to 8 at the
rear of the TV.
Tip
• You can also connect your TV to other optional components.
(See E)
Step 3
Plug in the power cord, then press ! on the TV to
turn it on.
Step 4
Press SELECT and PROGR + on the TV at the same time
for one to two seconds to preset the channels
automatically. (See J)
Tip
• To stop the automatic channel presetting, press SELECT twice.
Step 5
Press SELECT on the remote until “LANGUAGE/ :
ENGLISH” appears on the screen, then press + or – to
change the on-screen display language.
WARNING (continued)
Pull the power cord out by the plug. Do not pull
the power cord itself. Even if your TV is turned
off, it is still connected to the AC power source
(mains) as long as the power cord is plugged in.
Unplug the TV before moving it or if you are not
going to use it for several days.
Do not install the TV in an unstable position.
Use a proper TV stand.
C
Securing the TV
Do not plug in too many appliances to the same
power socket. Do not damage the power cord.
Do not place any objects on the TV.
B KV-TG21 only
To prevent the TV from falling, use the supplied screws, clamps and band to secure the TV
20 mm
screws clamps band
3.8 mm
Screw the band to the TV stand and to the
provided hole at the rear of your TV.
or
(1) Put a cord or chain through the
clamps.
(2) Screw one clamp to a wall or pillar
and the other clamp to the provided
hole at the rear of your TV.
.
B
WARNING
GENERAL
SECTION 1
• Dangerously high voltages are present inside the TV.
• TV operating voltage: 110 – 240 V AC.
• Do not plug in the power cord until you have completed making all other connections;
otherwise a minimum leakage current might flow through the antenna and other terminals to
ground.
• To avoid battery leakage and damage to the remote, remove the batteries from the remote if
you are not going to use it for several days. If any liquid that leaks from the batteries touches
you, immediately wash it away with water.
For your own safety, do not touch any part of the
TV, the power cord and the antenna cable during
lightning storms.
To prevent fire or shock hazard, do not expose
the TV to rain or moisture.
Do not block the ventilation openings of the TV.
Do not install the TV in a confined space, such
as a bookcase or built-in cabinet.
For children’s safety, do not leave children alone
with the TV. Do not allow children to climb onto
it.
Do not operate the TV if any liquid or solid object
falls into it. Have it checked immediately by
qualified personnel only.
Clean the TV with a dry and soft cloth. Do not use
benzine, thinner, or any other chemicals to clean
the TV. Do not scratch the picture tube.
Note
• Use only the supplied screws. Use of other screws may damage the TV.
D
TV front and rear panels
TV rear panel
TV front panel
Button Function
1 ! Turn off completely or turn on the TV.
2 Remote control sensor.
3 1 Standby indicator.
3 Wake Up indicator.
4 PROGR +/– Select program number.
5 2 +/– * Adjust volume.
6 t Select TV or video input.
7 SELECT Select the desired item.
8 i Headphone terminal. (KV-TG21 only)
8 Earphone terminal. (KV-PG14 only)
9, qa t Video input terminal.
0 8 Antenna terminal.
qs T Monitor output terminal.
* You can also use the 2 +/– buttons on the TV to work as the +/– buttons on the remote.
The operating instruction mentioned here are partial abstracts
Do not open the cabinet and the rear cover of the
TV as high voltages and other hazards are
present inside the TV. Refer servicing and
disposal of the TV to qualified personnel.
from the Operating Instruction Manual. The page numbers of
the Operating Instruction Manual remain as in the manual.
Your TV is recommended for home use only.
Do not use the TV in any vehicle or where it may
be subject to excessive dust, heat, moisture or
vibrations.
– 7 –
KV-PG14P40/PG14L70/PG14L70/H
WAKE UP TIMER:0H10M
WAKE UP TIMER:OFF
WAKE UP TIMER:12H00M
(After 10 minutes)
(No Wake Up timer) (After 12 hours)
SLEEP TIMER:30M SLEEP TIMER:60M
SLEEP TIMER:OFF SLEEP TIMER:90M
(After 30 minutes)
(No Sleep timer)
(After 60 minutes)
(After 90 minutes)
RM-952
E Connecting optional components
Connecting to the video input terminal ( t )
TV front panel
Audio/Video cable
(not supplied)
TV rear panel
Antenna cable
(not supplied)
Audio/Video cable
(not supplied)
Note
• Do not connect video equipment to
the same time; otherwise the picture will not be displayed properly on the screen.
t (video input) at the front and the rear of your TV at
Connecting to the monitor output terminal (T)
TV rear panel
(not supplied)
Camcorder
Video game
equipment
VCR
Audio systemAudio/Video cable
H Remote control
0
qa
qs
qd
qf
qg
-
SOUND
MODE
3
1
2
6
4
5
9
7
8
JUMP
0
PROGR
2
qh
qj
qk
FAVORITE
ql
TV
Button Function
1 ?/1 Turn off temporarily or
1
2 a Display the TV program.
2
3 JUMP Jump to previous
4 PROGR +/– Select program number.
5 2 +/– Adjust volume.
6 SELECT Select the desired item.
7 PIC MODE Select picture mode.
3
9 +/– Adjust items.
4
0
5
qa % Mute the sound.
qd t Select TV or video input.
6
qf 0 – 9, ÷ Input numbers.
Timer operations
7
qj Set TV to turn on
8
9
qk Set TV to turn off
qg SOUND MODE
qh A/B
Teletext operations
8 x (red, green,
0
qs
qd
qh
qj
qk
ql FAVORITE
yellow, blue)
turn on the TV.
program number.
Display on-screen
information.
automatically.
automatically.
Not function for your TV.
Not function for your TV.
Not function for your TV.
Not function for your TV.
See
K
I
I
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
F Troubleshooting
If you find any problem while viewing your TV, please check the following
guide. If any problem persists, contact your Sony dealer.
Symptom Solutions
Snowy picture,
noisy sound
No picture, no sound
Good picture, no sound
Dotted lines or stripes
Double images or
“ghosts”
No color
Abnormal color
patches
The 1 (standby)
indicator on your TV
flashes red several
times after every
three seconds.
TV cabinet creaks.
A "boom" sound is
heard when the TV is
turned on.
• Check the antenna cable and connection on the TV, VCR and on the wall.
• Preset the channel manually again. (See J)
• Check the antenna setup. Contact a Sony dealer for advice.
• Check the power cord, antenna and the VCR connections.
• Press ?/1 (power) or ! (main power) to turn on the TV.
• Press 2 + to increase the volume level.
• Press % to cancel the muting.
• Do not use a hair dryer or other equipment near the TV.
• Check the antenna setup. Contact a Sony dealer for advice.
• Use the fine tuning ("FINE") function. (See J)
• Turn off or disconnect the booster if it is in use.
• Check the antenna setup. Contact a Sony dealer for advice.
• Select the appropriate color system. (See J)
• Adjust the color level. (See K)
• Check the antenna setup. Contact a Sony dealer for advice.
• Keep external speakers or other electrical equipment away from the TV.
Press ! (main power) to turn off the TV for about 15 minutes, then turn
it on again to demagnetize the TV.
• Count the number of times the 1 (standby) indicator flashes. Press !
(main power) to turn off your TV. Contact your nearest Sony service
center.
• Changes in room temperature sometimes make the TV cabinet expand or
contract, making a noise. This does not indicate a malfunction.
• The TV's demagnetizing function is working. This does not indicate a
malfunction.
VCR
I
Setting the timers
You can turn on and off your TV by using the and buttons respectively.
Setting the Wake Up timer
\/1
SOUND
MODE
FAVORITE
1
2
4
5
7
8
-
0
PROGR
2
TV
Press until the desired period of time appears
1
on the screen.
3
6
9
JUMP
The Wake Up timer starts immediately after you
have set it.
Select the program number or video input you
2
want to wake up to.
Press \/1, or set the Sleep timer if you want
3
the TV to turn off automatically.
The
indicator on the TV lights up orange when
the TV goes into standby mode.
Setting the Sleep timer
Press until the desired period of time appears
on the screen.
– 8 –
The Sleep timer starts immediately after you have
set it.
Notes
• You can also cancel the Wake Up and Sleep timers by turning off the TV’s main power.
• If no buttons or controls are pressed for more than two hours after the TV is turned on using
the Wake Up timer, the TV automatically goes into standby mode.
KV-PG14P40/PG14L70/PG14L70/H
RM-952
J Presetting channels
You can automatically preset up to 100 TV channels in numerical sequence
from program number 1, or manually preset desired channels and channels
that cannot be preset automatically.
Presetting channels automatically
from a specified program number
3
1
Number
buttons
+ or –
PIC MODE
SELECT
PROGR +/–
-
SOUND
MODE
FAVORITE
2
4
5
7
8
0
2
TV
Press SELECT until “AUTO PROGRAM” appears
1
on the screen.
6
9
Press + or – once to enter the “AUTO
JUMP
2
PROGR
PROGRAM” mode.
The on-screen display will start flashing.
Press PROGR +/– or the number buttons until
3
the desired program number appears on the
screen.
Press + or – to start presetting channels
4
automatically.
Presetting channels manually
Press SELECT until “MANUAL PROGRAM”
1
appears on the screen.
Press + or – once to enter the “MANUAL
2
PROGRAM” mode.
Press PROGR +/– or the number buttons until
3
the desired program number appears on the
screen.
Press + or – until the desired channel picture
4
appears on the screen.
To preset other channels manually, repeat steps
5
3 to 4.
K Customizing the picture
You can customize the picture by selecting the picture mode or by adjusting its
settings.
Selecting the picture mode
Press PIC MODE to select the desired picture mode.
Select To
3
1
2
“DYNAMIC” view high contrast pictures.
6
4
5
9
7
8
“STANDARD” view normal contrast pictures.
JUMP
-
0
SOUND
PROGR
“SOFT” view mild pictures.
2
MODE
SELECT
+ or –
PIC MODE
Notes
•“HUE” can be adjusted for the NTSC color system only.
• Reducing “SHARP” can also reduce picture noise.
FAVORITE
Adjusting the picture setting
1Press SELECT until the desired setting appears.
Each time you press SELECT, the setting item will
change as follows:
TV
PICTURE COLOR BRIGHT
HUE
SHARP
Press + or – to adjust the item.
2
To adjust other items, repeat steps 1 to 2.
3
Presetting channels (continued)
To change the color system setting
If the color is abnormal when receiving programs through the 8 (antenna) terminal
or the t (video input) terminal
(1) Press SELECT until “COLOR SYS” appears on the screen.
(2) Press + or – to select the appropriate color system until the color is optimal.
AUTO PAL SECAM NTSC3.58 NTSC4.43
To skip program numbers
(1) Press PROGR +/– or the number buttons until the unused or unwanted program
number appears on the screen.
(2) Press SELECT until “MANUAL PROGRAM” appears on the screen.
(3) Press + or – once to enter the “MANUAL PROGRAM” mode.
(4) Press PIC MODE to skip the unused or unwanted program number.
(5) Press SELECT to exit the “MANUAL PROGRAM” mode.
Note
• To restore the skipped program number again, preset the channel automatically or manually.
To use the fine tuning function
The fine tuning (FINE) function may help to reduce the following problems: double
images and lines moving across the TV screen.
You can use the fine tuning function as below:
(1) Select the program number you want to adjust.
(2) Press SELECT until “MANUAL PROGRAM” appears on the screen.
(3) Press + or – once to enter the “MANUAL PROGRAM” mode.
(4) Press
to display “FINE” on the screen.
(5) Press + or – continuously until the above problems are minimized.
The + or – icon on the screen flashes while tuning.
(6) Press SELECT to exit the “MANUAL PROGRAM” mode.
– 9 –
One screw
(+BVTP 3 × 12)
1 Push to direction of arrow
and remove
2-1. REAR COVER REMOVAL
1 Seven screws
(+BVTP 4 × 16)
1 Rear Cover
1 Four screws
washer head
(BVTP 3 × 12)
CRT SUPPORT BLOCK
Speaker
Push claw
1 One screw
(+BVTP 4 × 16)
2 Terminal Bracket
– 10 –
SECTION 2
DISASSEMBLY
2-2. SPEAKER REMOVAL
KV-PG14P40/PG14L70/PG14L70/H
2-3. CHASSIS ASSY REMOVAL
RM-952
2-4. SERVICE POSITION
Caution:
standing position.
Note:
placing the chassis into Service Position.
Do not take out CRT support block while TV set in
Undress necessary wires that creates tension while
2-5. TERMINAL BRACKET REMOVAL
2-6. REPLACEMENT OF PARTS
For replacements of light guide,unscrew them, exchange with
new parts and fix them with screws respectively.
2-6-1. Replacement of Light Guide
2-6-2. Replacement of Power Button
2-7. PICTURE TUBE REMOVAL
!™
!£
8 Demagnetic coil
4 Four screws
(washer head)
(BVTP 3 × 12)
!º Two screws
(Tapping 5+
Crown Washer)
3 Speaker
(5 × 9cm)
6 Tension
spring
7 Chassis assy
5 Deflection
yoke
2 CV board
1 Anode cap
Coating earth assy
!∞ Picture tube
!¢ Cushion
9
Two screws
(Tapping 5 +
Crown Washer)
!¡
Holder DGC
Cushion (50x550) DGC
Cushion (35x250) DGC
A Board
Slim Beznet
CRT Support Block
Screw Location
a
a
b
b
Anode button
c
Note:
• Please make sure the TV set is not in standing position before removing necessary
CRT support located on bottom right and left.
• REMOVAL OF ANODE-CAP
NOTE : After removing the anode, short circuit the anode of the picture tube and
the anode cap to the metal chassis, CRT shield or carbon paint on the
CRT.
• REMOVING PROCEDURES
– 11 –
1 Turn up one side of the rubber cap in the direction indicated by the arrow a.
2 Using a thumb pull up the rubber cap firmly in the direction indicated by the arrow b.
3 When one side of the rubber cap is separated from the anode button, the anode-cap
can be removed by turning up the rubber cap and pulling it up in the direction of the
arrow c.
• HOW TO HANDLE AN ANODE-CAP
1 Do not damage the surface of anode-caps with sharp shaped objects.
2 Do not press the rubber too hard so as not to damage the inside of anode-cap.
A metal fitting called the shatter-hook terminal is built into the rubber.
3 Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage the rubber.
KV-PG14P40/PG14L70/PG14L70/H
RM-952
KV-PG14P40/PG14L70/PG14L70/H
RM-952
SECTION 3
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Controls and switches should be set as follows unless otherwise
noted:
PICTURE control ........................................................... normal
BRIGHTNESS control................................................... normal
................................................................................................................................................................................................................................
Preparation :
In order to reduce the influence of geomagnetism on the
Note : Test Equipment Required.
1. Pattern Generator
2. Degausser
3. Oscilloscope
Purity control
set's picture tube, face it east or west.
Switch on the set's power and degauss with the degausser.
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Set the pattern generator raster signal to a green raster.
3. Move the deflection yoke to the rear and adjust with the
purity control so that the green is at the center and the blue
and the red take up equally sized areas on each side.
(See Figures 3-1 through 3-4.)
4. Move the deflection yoke forward and adjust so that the
entire screen is green. (See Figure 3-1.)
5. Switch the raster signal to blue, then to red and verify the
condition.
6. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws and DY spacers.
7. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
}
normal
Red
Purity control
corrects this area.
b
a
Fig. 3-2
Blue
Green
Fig. 3-3
Disk magnets or rotatable
disk magnets correct these
areas (a-d).
Fig. 3-1
– 12 –
c
Deflection yoke positioning
corrects these areas.
a
d
d
b
Fig. 3-4
c
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