Sony Trinitron KV-34FS12T User manual

SERVICE MANUAL
BA-5 CHASSIS
MODEL COMMANDER DEST CHASSIS NO.
KV-34FS12T RM-Y168 TAIWAN SCC-S42B-A
TRINITRON®COLOR TV
RM-Y168KV-34FS12T
889 Front Page.p65 6/1/00, 10:21 AM1
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KV-34FS12T
KV-34FS12T
Power requirements 110V, 60 Hz
Number of inputs/outputs Video 1) 3
S Video 2) 1
Audio 3) 3
Audio Out 4) 1
Y,PB, PR5) 1
Speaker output(W) 5Wx2
Power Consumption(W)
In use(Max) 165W
In standby 5W
Dimensions(W/H/D)
(mm) 800 x 704 x 582 mm.
(in) 31 1/2 x 27 3/4 x 23 in.
Mass (kg) 74 kg.
(lbs) 163 lbs. 2 oz.
SPECIFICATIONS
Design and specifications are subject to change without notice.
Television system
AmericanTVstandard/NTSC
Channel coverage
VHF:2-13/UHF:14-69/CATV:1-125
Visible screen size
32” picture measured diagonally
Actual screen size
34” picture measured diagonally
Antenna
75 ohm external antenna terminal for VHF/UHF
Supplied accessories
Remote Commander RM-Y168
SizeAA(R6) batteries (2)
Optional accessories
Connecting cables: VMC-810S/820S,VMC-720M,
YC-15V/30V, RK74A
U/V mixer EAC-66
TV Stand: SU27FD3
1) 1 Vp-p 75 ohms unbalanced, sync negative
2) Y: 1 Vp-p 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms
3) 500mVrms (100% modulation), impedance: 47kilohms
4) More than 408 mVrms at the maximum volume setting (variable)
More than 408 mVrms (fix)
5) Y: 1.0 Vp-p, 75 ohms, sync negative; PB: 0.7 Vp-p, 75 ohms;
PR: Vp-p, 75 ohms
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KV-34FS12T
Section Title Page
Warnings and Cautions ....................................................................................................................................... 4
Self-DiagnosticFunction ...................................................................................................................................... 4
SafetyCheck-OutInstructions.............................................................................................................................. 7
1. GENERAL ........................................................................................................................................................... 8
2. DISASSEMBLY
2-1. Rear CoverRemoval ............................................................................................................................... 14
2-2. ChassisAssemblyRemoval..................................................................................................................... 14
2-3. ServicePosition ...................................................................................................................................... 14
2-4. PictureTube Removal ............................................................................................................................. 15
3. SET-UP ADJUSTMENTS
3-1. BeamLanding......................................................................................................................................... 16
3-2. Convergence .......................................................................................................................................... 17
3-3. Focus...................................................................................................................................................... 18
3-4. Screen(G2) ............................................................................................................................................ 19
3-5. Method of Setting the ServiceAdjustment Mode ..................................................................................... 19
3-6. WhiteBalanceAdjustments .................................................................................................................... 19
4. SAFETY RELATED ADJUSTMENTS
4-1. R564 Confirmation Method (HV Hold-Down Confirmation) and Readjustments ................................. 20
4-2. B+ Voltage Confirmation andAdjustment ................................................................................................ 20
5. CIRCUITADJUSTMENTS
5-1. SettingtheServiceAdjustment Mode...................................................................................................... 22
5-2. MemoryWriteConfirmation Method........................................................................................................ 22
5-3. AdjustmentButtons and Indicators.......................................................................................................... 22
5-4. MABoardAdjustments............................................................................................................................ 26
6. DIAGRAMS
6-1. BlockDiagram......................................................................................................................................... 31
6-2. CircuitBoardLocation............................................................................................................................. 37
6-3. PrintedWiringBoards and Schematic Diagrams..................................................................................... 37
• ABoard .............................................................................................................................................. 38
• MABoard............................................................................................................................................ 45
• HX Board............................................................................................................................................ 49
• CA Board ............................................................................................................................................ 51
• K Board .............................................................................................................................................. 52
• VABoard ............................................................................................................................................ 54
• D Board .............................................................................................................................................. 55
6-4. Semiconductors ...................................................................................................................................... 57
7. EXPLODED VIEW
7-1. Chassis ................................................................................................................................................... 58
8. ELECTRICAL PARTS LIST .............................................................................................................................. 59
TABLE OF CONTENTS
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KV-34FS12T
WARNINGSAND CAUTIONS
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.
WARNING!!
AN ISOLATION TRANSFORMER SHOULD BE USED
DURING ANY SERVICE TO AVOID POSSIBLE SHOCK
HAZARD, BECAUSE OF LIVE CHASSIS. THE CHASSIS
OFTHIS RECEIVERIS DIRECTLYCONNECTED TOTHE
AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
ONTHE SCHEMATICDIAGRAMS, EXPLODEDVIEWS,
AND IN THE PARTS LIST ARE CRITICAL FOR SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT
ARECRITICALFORSAFE OPERATIONAREIDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES
WHENEVERCRITICALCOMPONENTSARE REPLACED
OR IMPROPER OPERATION IS SUSPECTED.
ATTENTION!!
APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURT-CIRCUITER
L'ANODE DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU
CHASSIS METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE
PEINTE SUR LE TUBE CATHODIQUE OU AU BLINDAGE DU TUBE
CATHODIQUE.
ATTENTION!!
AFIN D'EVITER TOUT RESQUE D'ELECTROCUTION PROVENANT D'UN
CHÁSSISSOUSTENSION,UNTRANSFORMATEURD'ISOLEMENTDOITETRE
UTILISÉLORSDETOUTDÉPANNAGE.LECHÁSSISDECERÉCEPTEUREST
DIRECTEMENTRACCORDÉÀL'ALIMENTATION SECTEUR.
ATTENTIONAUX COMPOSANTS RELATIFSA LASECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE MARQUE
SUR LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES
LISTES DE PIECES SONT D'UNEIMPORTANCE CRITIQUE POUR LA
SECURITE DU FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST INDIQUE DANS
LEPRESENTMANUELOUDANS DESSUPPLEMENTSPUBLIES PAR SONY.
LESREGLAGES DE CIRCUITDONT L'IMPORTANCE ESTCRITIQUE POUR
LA SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE
PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE
REMPLACEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN
MAUVAIS FONTIONNEMENT SUSPECTE.
SELF-DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to flash.
The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED 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.
Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If there is
more than one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
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KV-34FS12T
Display of Standby/Timer LED Flash Count
2 times
4 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec. LED OFF
3 sec.
Diagnostic Item Flash Count*
+B overcurrent 2 times
I-Prot 4 times
IK 5 times
*One flash count is not used for self-diagnostic.
Stopping the Standby/Timer LED Flash
Turnoffthe power switchontheTVmain unitor unplugthe power cordfromthe outletto stopthe STANDBY/TIMER LAMPfrom flashing.
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 occurrences of failure on the screen for confirmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
Display Channel 5Sound volume
Note that this differs from entering the service mode (sound volume ).
Power ON
+
Self-Diagnostic Screen Display
SELF DIAGNOSTIC
2: 000
3: N/A
4: 000
5: 001
101: N/A
Numeral 0 means that no fault was detected.
Numeral 1 means a fault was detected one time only.
STANDBY/TIMER LED
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KV-34FS12T
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 when the diagnostic screen is displayed,
as shown below:
ENTERChannel 8
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
+B overcurrent (OCP) Occurs when an overcurrent on the +B (135V) line is detected by pin 33 of IC301 (MA Board). If
the voltage of pin 33 of IC301 (MABoard) is less than 1V whenV.SYNC is more than seven
verticals in a period, the unit will automatically turn off.
I-Prot Occurs when an absence of the vertical deflection pulse is detected by pin 5 of IC001 (MA
Board). Power supply will shut down when waveform interval exceeds 2 seconds.
IK If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be
detected by IC301 (MABoard). TV will stay on, but there will be no picture.
*(Refers to the RGB levels of theAKB detection Ref pulse that detects 1K).
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KV-34FS12T
After correcting the original service problem, perform the
following safety checks before releasing the set to the
customer:
1. Check the area of your repair for unsoldered or poorly
soldered connections. Check the entire board surface
for solder splashes and bridges.
2. Check the interboard wiring to ensure that no wires are
“pinched”or touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground
straps, and mounting hardware have been replaced.
Be absolutelycertainthatyou have replaced all the
insulators.
4. Look for unauthorized replacement parts, particularly
transistors,that were installed during a previous repair.
Point them out to the customer and recommend their
replacement.
5. Look for parts which, though functioning, show obvious
signs of deterioration. Point them out to the customer
and recommend their replacement.
6. Check the line cords for cracks and abrasion.
Recommend the replacement of any such line cord
to the customer.
7. Check the B+ and HV to see if they are specified
values. Makesure your instrumentsareaccurate;
be suspicious of your HV meter if sets always have
low HV.
8. Checktheantenna terminals, metaltrim, “metallized”
knobs, screws, and all other exposed metal parts forAC
leakage. Check leakage as described below.
SAFETY CHECK-OUT
Leakage Test
TheAC leakage from any exposed metal part to earth
ground and from all exposed metal parts to any exposed
metal part having a return to chassis, must not exceed 0.5
mA (500 microamperes). Leakage current can be
measured by any one of three methods.
1. Acommercial leakage tester, such as the Simpson 229
or RCAWT-540A. Follow the manufacturers'
instructions to use these instructions.
2. Abattery-operatedAC milliammeter.The Data Precision
245 digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means
of a VOM or battery-operatedAC voltmeter. The “limit”
indication is 0.75 V, so analog meters must have an
accurate low voltage scale.The Simpson’s 250 and
Sanwa SH-63TRD are examples of passive VOMs that
aresuitable.Nearlyallbattery-operateddigital
multimeters that have a 2 VAC range are suitable
(see FigureA).
How to Find a Good Earth Ground
Acold-waterpipe isa guaranteedearth ground;the cover-
plateretainingscrewonmostAC outletboxesisalsoat earth
ground.If theretainingscrewistobeusedasyour earth
ground,verifythat itisatground by measuringtheresistance
betweenitanda cold-water pipe with anohmmeter.The
readingshouldbezeroohms.If a cold-water pipe is not
accessible, connecta 60-to100-watt trouble- light(not a
neonlamp) between the hot side ofthe receptacleand the
retainingscrew.Trybothslots,ifnecessary, to locatethehot
sideonthe line; thelampshouldlight atnormalbrillianceifthe
screwisatground potential (seeFigureB).
Figure B. Checking for earth ground.FigureA. Using an AC voltmeter to checkAC leakage.
Trouble Light
AC Outlet Box Ohmmeter
Cold-water Pipe
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KV-34FS12T
Theinstructions mentioned here are partialabstractsfromthe Operating Instruction Manual.
The page numbers shown reflect those of the Operating Instruction Manual.
SECTION 1 GENERAL
3
Connecting Your TV
Read this chapter before setting up your TV for the first time. This section
covers basic connections in addition to any optional equipment you may
be connecting.
Basic Connections
TV with indoor or outdoor antenna, or CATV cable
Depending on the cable available in your home, choose one of the
connections below:
 If you are connecting to an indoor or outdoor antenna, you may need to
adjust the orientation of the antenna for best reception.
4
Operating Instructions
Cable Box Connections
Some pay cable TV systems to use scrambled or encoded signals that
requireacableboxtoviewallchannels.
Cable Box
1 Connect the coaxial cable from your cable service to the IN jack on
your cable box.
2 Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the VHF/UHF jack on your TV.
Cable Box and Cable
For this set up, you can switch between scramble channels (through your
cable box), and normal (CATV) channels by using the button.
 If you will be controlling all channel selection through your cable box, you
should consider using the Channel Fix feature, (see page 26).
 If you are connecting a cable box through the AUX input and would like to
switch between the AUX and normal (CATV) input, you should consider using
the Channel Fix feature, (see page 26).
 Your Sony remote control can be programmed to operate your cable box,
(see page 36).
 When using PIP, you cannot view the AUX input in the window picture.
Cable
IN OUT
(Rear of TV)
VHF/UHF
Cable Box
Cable Box (Rear of TV)
AUX
OUT
IN
TO CONVERTER
(Signal)
VHF/UHF
75-ohm coaxial cable (not supplied)
CATV cable (unscrambled channels)
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KV-34FS12T
Connecting Your TV
5
Connecting Additional Equipment
TV and VCR
1 Connect the coaxial cable from your TV antenna or cable service to
the IN jack on your VCR.
2Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF jack on the TV.
(Optional connection)
3If your VCR is equipped with video outputs, you can get better
picture quality by connecting A/V cables (not supplied) from
AUDIO and VIDEO OUT on your VCR to AUDIO/VIDEO IN on
your TV.
 To watch video programs from your VCR, tune your TV to channel 3 or 4 (as
set on the rear of your VCR).
 For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, the audio cables must still be connected.
 You can use the button to switch between the VHF/UHF and VIDEO
inputs.
(Optional connection)
From
cable/
VCR
2
1
3
antenna
Rear of TV
6
Operating Instructions
TV and Cable Box
1 Connect the coaxial cable from your cable service to the IN jack on
your cable box.
2 Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the VHF/UHF jack on the TV.
 To view channels from your cable box, tune your TV to channel 3 or 4 (as set
on the rear panel of your cable box) and use the cable box’s remote control to
change channels.
 If you will be controlling all channel selection through your cable box, you
should consider using the Channel Fix feature, (see page 26).
1
cable
2
Cable Box
Rear of TV
From
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KV-34FS12T
Connecting Your TV
7
TV, Cable box, and Cable
KV-27FS16, KV-27FV16, KV-32FS16, KV-29FV16 only
For this set up, you can switch between scrambled channels (through
your cable box) and normal (CATV) channels by pressing .
 When using PIP, the AUX input cannot be viewed in the window picture.
Cable Box
From
Cable
Rear of TV (KV-27FV16 only)
8
Operating Instructions
TV, VCR, and Cable box
1Connect the coaxial cable from your cable service to the IN jack on
your cable box.
2Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the IN jack on your VCR.
3Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF jack on the TV.
(Optional connection)
4If your VCR is equipped with video outputs, you can get better
picture quality by connecting A/V cables (not supplied) from
AUDIO and VIDEO OUT on your VCR to AUDIO/VIDEO IN on
your TV.
 If you will be controlling all channel selection through your cable box, you
should consider using the Channel Fix feature, (see page 26).
 For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, the audio cables must still be connected.
 You can use the button to switch between the VHF/UHF and VIDEO
inputs.
3
Cable
4(Optional connection)
Cable box
1
VCR
2
Rear of TV
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KV-34FS12T
Connecting Your TV
9
TV and Satellite Receiver
1 Connect the cable from your satellite antenna to SATELLITE IN on
your satellite receiver.
2 Connect the coaxial cable from your cable or antenna to the
VHF/UHFjackonyourTV.
3 Using A/V cables, connect AUDIO and VIDEO OUT on your
satellite receiver to AUDIO and VIDEO IN on your TV.
 For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, the audio cables must still be connected.
 You can use the button to switch between the VHF/UHF and satellite
receiver inputs.
VHF/UHF
OUT
IN
LINE OUT
SATELLITE IN
AUDIO R AUDIO L VIDEO
Satellite receiver
Satellite
antenna
cable
1
2
3
From
cable/
antenna
Rear of TV
10
Operating Instructions
TV, Satellite Receiver, and VCR
1 Connect the cable from your satellite antenna to SATELLITE IN on
your satellite receiver.
2 Connect the coaxial cable from your cable or antenna to the
IN jack on your VCR.
3 Using a coaxial cable, connect the OUT jack on your VCR to the
VHF/UHFjackonyourTV.
4 Using A/V cables, connect AUDIO and VIDEO OUT on your
satellite receiver to AUDIO and VIDEO IN on your VCR.
5 Using A/V cables, connect AUDIO and VIDEO OUT on your VCR to
AUDIO and VIDEO IN on your TV.
 To view from the satellite receiver or VCR, select the video input to which
your satellite receiver or VCR is connected by pressing on the remote
control.
AUDIO R AUDIO L VIDEO
VHF/UHF
OUT
IN
LINE OUT
LINE IN
VHF/UHF
OUT
IN
SATELLITE IN
AUDIO R AUDIO L VIDEO
LINE OUT
Satellite receiver
4
5
2
3
1
Rear of TV
VCR
Satellite
antenna
From
antenna
cable/
cable
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KV-34FS12T
14
Using the Remote Control and
Basic Functions
This section shows you how to use the more advanced buttons on the
remote control and how to use the on-screen menus.
Using the Remote Control
Button Description
POWER Press when you want to turn
connectedequipmentonandoff.
FUNCTION Press when you want to control
connected equipment with your
remote control.
MUTING Instantly turns off the sound.
Press again or press to restore
sound.
SYSTEM
OFF Powers off all Sony equipment at
once, (may not work with older
equipment).
TV/VIDEO Cycles through available video
inputs.
ANT Press to change the VHF/UHF
input to the AUX input
(KV-27FS16, KV-27FV16,
KV-32FS16 only).
TV/VTR Press when you are finished
using a VCR and you want to
switch to the TV input. Your
VCR power will remain on.
Moves the cursor in the on-
screen menus. Press the arrow
buttons to move the cursor. Press
the center button to select or
access an option.
PICTURE
MODE Cycles through the available
Video Mode settings.
 The remote control shown (RM-Y171) is for KV-27FV16. Your remote control
may not look like the one illustrated.
/
Using the Remote Control and Basic Functions
15
SLEEP Turns the TV off automatically in
approximately 15, 30, 45, 60, 90,
or 120 minutes. Cancel by
pressing until SLEEP OFF
appears.
MTS/SAP Cycles through the
Multi-channel TV Sound (MTS)
options: Stereo, Mono, and
Auto-SAP (Second Audio
Programming).
DISPLAY Press once to show current time,
(if set) and channel number.
Cycles through available Steady
Sound settings, (see page 23).
JUMP Alternates between the last two
channels selected with the
buttons.
GUIDE Brings up the custom guide of
your satellite receiver.
MENU Displays the on-screen menu.
Press again to exit the menu at
any time.
RESET Press to return to factory settings
while in an on-screen menu.
CODE SET Use to program your remote
control to operate connected
video equipment, (see page 36).
 For information on Picture in Picture (PIP) operation buttons, see page 17.
 If you lost your remote control, see page 40.
0 9
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KV-34FS12T
Other Information
39
Troubleshooting
If you are having a problem with your TV, try the suggestions below. If
the problem persists, contact your nearest Sony dealer.
No picture, no
sound
 Make sure the power cord is plugged in.
 If red light is flashing on the front of your TV for more
than a few minutes, disconnect and reconnect the
power cord to restore the TV. If the problem continues,
call your local service center.
 Check the TV/VIDEO settings: when watching TV, set
to TV; when watching video equipment, set to VIDEO
(page 14).
 Make sure the batteries have been inserted correctly
into the remote control (page 2).
 Try another channel, it could be station trouble.
Poor or no
picture, good
sound
 Adjust Picture in the Video menu (page 22).
 Adjust Brightness in the Video menu (page 22).
 Check the antenna and/or cable connections (page 3).
Good picture,
no sound
 Press sothatMUTINGdisappearsfromthe
screen (page 14).
 Check your Audio settings. Your TV may be set to
Auto-SAP (page 24).
No color  Adjust Color in the Video menu (page 22).
No signal  Check the Cable setting in the Channel Setup menu
(page 25).
 Check the antenna and/or cable connections (page 3).
 Make sure the channel selected is currently
broadcasting.
Dotted lines or
stripes
 Adjust the antenna.
 Move the TV away from other electronic equipment.
Some electronic equipment can create electrical noise,
which can interfere with TV reception.
Double images
or ghosts
 Check your outdoor antenna or call your cable service.
40
Operating Instructions
If, after reading these Operating Instructions, you have additional questions related to the use of your
Sony television, please call our Direct Response Center at 1-800-222-SONY (7669) (U.S. residents
only) or (416) 499-SONY (7669) (Canadian residents only).
Cannot receive
higher number
channels(UHF)
when using an
antenna
 Make sure Cable is set to OFF in the Channel Setup
menu (page 25).
 Perform Auto Program to add channels that are not
presently in the memory (page 16).
Cable stations
don’t seem to
work
 Make sure Cable is set to ON in the Channel Setup
menu (page 25).
 Perform Auto Program to add channels that are not
presently in the memory (page 16).
Remotecontrol
does not
operate
 Batteries could be weak. Replace them (page 2).
 Move the TV 3-4 feet away from fluorescent lights.
The TV needs
to be cleaned
 Clean the TV with a soft dry cloth. Never use strong
solvents such as thinner or benzine, which might
damage the finish of the cabinet.
Lost password
for Parental
Control
 In the password screen, enter the following master
password: 4357. After using the master password, you
must create a new password, it cannot be used to
unlock currently blocked channels.
You lost your
remote control
 You can use the front A/V panel controls to access the
menu. Press to open the menu. Use the or
buttons on the front A/V panel instead of the
F or
buttons on the remote control. Use the button on
the front A/V panel instead of the G,g,and
buttons on the remote control. Press again when
the setting or adjustment is complete. Contact your
nearest Sony dealer to order a replacement.
Cannot access
other menus
when using the
Basic Menu
 If you use the button to close the Basic menu, only
the Basic menu appears when you press again. To
have access to the other menus, use the button to
select Advance Menu (page 35).
F
F
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— 14 —
KV-34FS12T
SECTION 2
DISASSEMBLY
2-1. REAR COVER REMOVAL
2-2. CHASSISASSEMBLY REMOVAL 2-3. SERVICE POSITION
CA Board
A Board
D Board
VABoard
MA Board
Chassis
Assembly
Claw
4 Screws
(+BVTP 4x16)
4 Screws (+BVTP 3x16)
4 Screws
(+BVTP 4x16)
4 Screws (+BVTP 4x16) RearCover
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—15 —
KV-34FS12T
Coated
Earth
Ground
Strap
2-4. PICTURE TUBE REMOVAL
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT
even after the power is disconnected.
To avoid electric shock, discharge
CRT before attempting to remove the
anode cap. Short between anode and
CRT coated earth ground strap.
a
REMOVAL PROCEDURES
HOW TO HANDLE AN ANODE CAP
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electrical shock, discharge the CRT before
attempting to remove the anode cap. Short between anode and coated earth ground strap of CRT.
NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield,
or carbon painted on the CRT.
1Do not use sharp objects which may cause damage to the
surface of the anode cap.
3Do not force turn the foot of the rubber cover. This may cause
the shatter-hook terminal to protrude and damage the rubber.
2To avoid damaging the anode cap, do not squeeze the rubber
covering too hard. A material fitting called a shatter-hook terminal
is built into the rubber.
2Use your thumb to pull the rubber
cap firmly in the direction indicated
by arrow
b.
3When one side of the rubber cap
separates from the anode button,
the anode cap can be removed by
turning the rubber cap and pulling
it in the direction of arrow
c.
1Turn up one side of the rubber cap in
the direction indicated by arrow
a.
b
Anode Button
c
ANODE CAP REMOVAL
6. Loosen the deflection yoke fixing screw and remove.
7. Place the setwith the CRTface downona cushionandremove
the degaussing coil holders.
8. Remove the degaussing coils.
9. Remove the CRT grounding strap and spring tension devices.
10. Unscrew the four CRT fixing screws [located on each CRT
corner] and remove the CRT [Take care not to handle the
CRT by the neck].
1. Discharge the anode of the CRT and remove the anode cap.
2. Unplug all interconnectingleads fromthe deflectionyoke,neck
assembly, degaussing coils and CRT grounding strap.
3. Remove the CABoard from the CRT.
4. Remove the chassis assembly.
5. Loosen the neck assembly fixing screw and remove.
2
3
4
9
8
7
6
5
10
1
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—16 —
KV-34FS12T
SECTION 3
SET-UP ADJUSTMENTS
3-1. BEAM LANDING
Before beginning adjustment procedure:
1. Degauss the entire screen.
2. Feed in the white pattern signal.
Adjustment Procedure
1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw and set the purity
control to the center as shown below.
Purity Control
3. Turn the raster signal of the pattern generator to green.
4. Move the deflection yoke backward and adjust the purity
control so that green is in the center and red and blue are
at the sides evenly.
Blue Red
Green
5. Move the deflection yoke forward and adjust so that the entire
screen becomes green.
6. Switch over the raster signal to red and blue and confirm
the condition.
7. When the position of the deflection yoke is determined,
tighten it with the deflection yoke mounting screw.
8. If landing at the corner is not right, adjust by using the disk
magnets.
The following adjustments should be made when
a complete realignment is required or when a new
picture tube is installed.
These adjustments should be performed with rated
power supply voltage unless otherwise noted.
Set the controls as follows unless otherwise noted:
VIDEO MODE: STANDARD
PICTURE control: ................ Normal
BRIGHTNESS control: ........ Normal
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Note:Test equipment required:
•Color Bar Pattern Generator
•Degausser
•DC Power Supply
•DigitalMultimeter
a
c
b
d
ba
cd
Purity control
corrects this area
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
Deflection yoke positioning
corrects these areas
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—17 —
KV-34FS12T
3-2. CONVERGENCE
Before starting convergence adjustments:
1. Perform FOCUS, V.LINAND V.SIZE adjustments.
2. Set BRIGHTNESS control to minimum.
3. Feed in dot pattern.
Vertical Static Convergence
1. AdjustV.STAT magnet to converge red, green and blue
dots in the center of the screen (Vertical movement adjust
V.STAT RV701 to converge).
2. Tilt the V.STAT magnet and adjust static convergence to open
or close the V.STAT magnet.
When the V.STAT magnet is moved in the direction of arrows
a and b, red, green, and blue dots move as shown below:
a
bbB
G
R
ab
B
G
R
aBGR
RGB
b
R
G
B
b
b
a
R
G
B
(1)
(3)
(2)
Dynamic Convergence Adjustment
Before performing this adjustment, perform Horizontal
and Vertical Static ConvergenceAdjustment.
1. Slightly loosen deflection yoke screw.
2. Remove deflection yoke spacers.
3. Move the deflection yoke for best convergence
as shown on the following page.
Horizontal Static Convergence
If the blue dot does not converge with the red and green dots,
perform the following:
1. Move BMC magnet (a) to correct insufficient H. Static
convergence.
2. Rotate BMC magnet (b) to correct insufficient V. Static
convergence.
3. After adjusting the BMC magnet, repeat Beam Landing
Adjustment.
BMC MAGNET
PURITY
V.STAT
b
BMC magnet
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—18 —
KV-34FS12T
RGB BGR
RGB
R
R
R
G
B
G
B
G
B
RGB
BGR
R
G
BR
G
B
BGR RGB
4. Tighten the deflection yoke screw.
5. Install the deflection yoke spacers.
TLH Plate Adjustment
1. Input crosshatch pattern.
2. Adjust PICTURE QUALITY to standard, PICTURE and
BRIGHTNESS to 50%, and OTHER to standard.
3. Adjust the Horizontal Convergence of red and blue dots
by tilting the TLH plate on the deflection yoke.
(TLV)
YCH
XCV TLV
CA
Board
VA
Board
RV7 1
V.STAT
TLH Plate
B R R B
(R)(B) (B)(R)
TLH+
TLH-
3-3. FOCUS
1. Adjust FOCUS control for best picture.
ba
cd
a
b
d
a-d: screen-corner
misconvergence
c
4. Adjust XCV core to balance X axis.
5. Adjust YCHVR to balanceYaxis.
6. Adjust vertical red and blue convergence withV.TILT
(TLV VR).
Note: Perform adjustments 3-6 while tracking items 1 and 2.
Screen-Corner Convergence
1. Affix a permalloy assembly corresponding to the
misconverged areas.
Focus (FV)
Screen (G2)
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—19 —
KV-34FS12T
3-5. METHOD OF SETTING THE SERVICE
ADJUSTMENT MODE
Service Mode Procedure
1. Standby mode (power off).
2. Press
Display Channel 5Sound volume Powe
r
+
on the Remote Commander (press each button within a
second).
Service Adjustment Mode In
1. The CRT displays the item being adjusted.
2. Press or on the Remote Commander to select the item.
3. Press or on the Remote Commander to change the
data.
4. Press then to save into the memory.
Service Adjustment Mode Memory
Turn set off then on to exit service adjustment mode.
service defl hsiz 16
ntsc
vchp
Category
Display
Item
Mode
Item
Data
Signal
Type
write
3-4. SCREEN (G2)
1. Input a dots pattern.
2. Set the PICTURE and BRIGHTNESS controls at minimum
and COLOR control at normal.
3. Adjust SBRT, GCUT, BCUT in service mode with an
oscilloscope as shown below so that voltages on the red,
green, and blue cathodes are 170 ± 2.0 VDC.
4. Observe the screen and adjust SCREEN (G2) VR in FBT
to obtain the faintly visible background of dot signal.
3-6. WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal with burst.
2. Set to ServiceAdjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Adjust with SBRT if necessary.
5. Select GCUT and BCUT with and .
6. Adjust with and for the best white balance.
7. Set PICTURE and BRIGHTNESS to maximum.
8. Select GDRV and BDRV with and .
9. Adjust with and for the best white balance.
10. To write into memory, press then .
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—20 —
KV-34FS12T
SECTION 4
SAFETY RELATED ADJUSTMENTS
4-1. R564 CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
The following adjustments should always be performed when
replacing the following components which are marked with on
the schematic diagram:
Part Replaced ( ) Adjustment ( )
HV HOLD-DOWN
(R564)
DY, T505, CRT, IC501, C507,
C520, C505, C509, C515, T504,
T503, C551, L510, C546, C537,
C547, D517, D518, D519, R560,
R561, R562, R563, R565, R566,
R567, R525........................A Board
IC301.............................MA Board
Preparation Before Confirmation
1. Using a Variac, applyAC input voltage: 120 ± 2 VAC.
2. Turn the POWER switch ON.
3. Input a white signal and set the PICTURE and
BRIGHTNESS controls to maximum.
4. Confirm that the voltage between C546 (+) or TP503
and ground is more than 23.0 VDC.
Hold-Down Operation Confirmation
1. Connect the current meter between Pin 11 of the FBT
(T505) and the PWB land where Pin 11 would normally
attach (See Figure 1 on the next page.)
2. Input a dot signal and set PICTURE and BRIGHTNESS
to minimum: IABL = 2175 + 100/- 325 µA.
3. Confirm the voltage ofA Board TP-600 is 135 ± 1.5 VDC.
4. Connect the digital voltmeter and the DC power supply
via diode 1SS119 to C546 (+) and ground (See Figure 1
on the next page.)
5. Increase the DC power voltage gradually until the picture
blanks out.
6. Turn DC power source off immediately.
7. Read the digital voltmeter indication
(standard < 27.24 + 0.0/- 0.1 VDC) .
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 2175 + 100/- 325 µA .
9. Repeat Steps 4 to 7.
Hold-Down Readjustment
If the setting indicated in Step 2 of Hold-Down Operation
Confirmation cannot be met, readjustment should be performed by
altering the resistance value of R564 component marked with
.
+
IABL
ABL
T5 5
FBT
range
-
ammeter
3. mA DC
A
4-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENT
Note: The following adjustments should always be performed
when replacing the following components, which are marked with
on the schematic diagram on theABoard.
A BOARD: IC601, PH601
1. Using a Variac, applyAC input voltage: 130 + 2.0/-0.0 VAC.
2. Input a monoscope pattern.
3. Set the PICTURE and BRIGHTNESS controls to minimum.
4. Confirm that the voltage ofA BoardTP-600 is <136.5 VDC.
5. If Step 3 is not satisfied, replace the components listed above,
then repeat Steps 1–3.
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