Design and specifications are subject to change without notice.
The ( • ) SRS (SOUND RETRIEVAL SYSTEM) is
manufactured by Sony Corporation under license
from SRS Labs, Inc. It is covered by U.S. Patent No.
4,748,669. Other U.S. and foreign patents pending.
The word ‘SRS’ and the SRS symbol ( • ) are
registered trademarks of SRS Labs, Inc.
BBE and BBE symbol are trademarks of BBE Sound,
Inc. and are licensed by BBE Sound, Inc. under U.S.
Patent No. 4,638,258 and 4,482,866.
— 2 —
Page 3
KV-20FV10/21FV10/21FV10C/25FV10A
TABLE OF CONTENTS
SectionTitlePage
Warnings and Cautions............................................................................................................................................................... 4
Self-Diagnostic Function ............................................................................................................................................................. 4
2-3.Service Position ............................................................................................................................................................ 1 4
3-5.Method of Setting the Service Adjustment Mode .........................................................................................................19
4-1. R582 and R584 Confirmation Method (HV Hold-Down Confirmation and Readjustments) ...................................20
4-2.B+ Voltage Confirmation and Adjustment ..................................................................................................................... 20
5.CIRCUIT ADJUSTMENTS
5-1.Setting the Service Adjustment Mode ..........................................................................................................................22
5-3.Adjustment Buttons and Indicators............................................................................................................................... 22
6-3.Printed Wiring Boards and Schematic Diagrams .........................................................................................................30
• A Board ....................................................................................................................................................................31
• C Board ....................................................................................................................... ............................................. 38
• G Board ....................................................................................................................................................................39
• V Board ....................................................................................................................................................................43
8.ELECTRICAL P AR TS LIST.................................................................................................................................................52
— 3 —
Page 4
KV-20FV10/21FV10/21FV10C/25FV10A
WARNINGS AND 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
OF THIS RECEIVER IS DIRECTLY CONNECTED TO THE
AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
ON THE SCHEMA TIC DIAGRAMS, EXPLODED VIEWS,
AND IN THE PARTS LIST ARE CRITICAL FOR SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PA RT NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT
ARE CRITICAL FOR SAFE OPERA TION ARE IDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES
WHENEVER CRITICAL COMPONENTS ARE REPLACED
OR IMPROPER OPERA TION IS SUSPECTED .
A TTENTION!!
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
CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT ETRE
UTILISÉ LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE RÉCEPTEUR EST
DIRECTEMENT RACCORDÉ À L'ALIMENTATION SECTEUR.
A TTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
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
LE PRESENT MANUEL OU DANS DES SUPPLEMENTS PUBLIES P AR SONY.
LES REGLAGES DE CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR
LA SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE
PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE
REMPLACEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN
MAUV AIS FONTIONNEMENT SUSPECTE.
SELF-DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the ST ANDBY/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”.
Diagnostic Item
Description
Powerdoes not turn onDoes notlight
+B over curren t (OCP)*2times2:0 or 2:1• H.OUT(Q502)is shorted. (A Board)
Verticaldeflectionstopped*4 times4:0 or 4:1• +13V is not supplied.(A Board)
White balance failur e
(not balanced)
No. of Times
ST AN DB Y/T IM ER
LED Flashes
5 times5:0 or 5:1• Video OUT(IC541) is faulty .(A Board)
Self-diagnosticDisplay/
Diagnostic Result
Proba bl e Cause
Location
• Power cord is not plugged in.
• Fuse is burned out. (F600) (G Board)
• IC1751 is shorted. (C Board)
• IC541 is faulty.(A Board)
• IC301 is faulty.(A Board)
• Screen (G2) is improperlyadjusted.**
Detected Symptoms
• Power does not come on.
• No poweris suppliedto the TV.
• AC powersupply is faulty .
• Power does not come on.
• Load on power lineis shorted.
• Has entered standby state afterhorizontal raster.
• Verticaldeflection pulse is stopped.
• Power line is shorted or powersupply is stopped.
• No raster is generated.
• CRT cathodecurrent detection refe rence
pulse output is small.
* If a +B overcurrentis detected, stoppageof the vertical deflection is detectedsimultaneously .
The symptomthat is diagnose d first by the microc ontrol leris displayed on the screen.
** Refer to Screen (G2) Adjus tmentsin Section 3-4 of this manual.
— 4 —
Page 5
Display of Standby/Timer LED Flash Count
2 times
4 times
5 times
KV-20FV10/21FV10/21FV10C/25FV10A
LED ON 0.3 sec.
LED OFF 0.3 sec.
Diagnostic ItemFlash Count*
+B overcurrent2 times
V ertical deflection stopped4 times
White balance failure5 times
*One flash count is not used for self-diagnostic.
LED OFF
3 sec.
STANDBY/TIMER LED
Stopping the Standby/Timer LED 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.
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:
DisplayChannel
5
Sound volume
Power ON
Self-Diagnostic Screen Display
SELF DIAGNOSTIC
2:0
3:N/A0
4:0
5:1
101:N/A0
Note that this differs from entering the service mode (sound volume
Numeral “0” means that no fault was detected.
Numeral “1” means a fault was detected one time only.
— 5 —
+
).
Page 6
KV-20FV10/21FV10/21FV10C/25FV10A
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:
8
ENTERChannel
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn of f the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
FROM
CRT
FROM
IC521
PIN 7
IC301
Y/CHROMA JUNGLE
K IN
21
HP/PROTECT
18
SDA
35
IC541
V. OUT
REF
IC001
SYSTEM
IO-BDAT
O-LED
36
18
DISPLAY
3
17
37
I-PROT
IO-SDAT
5
IC003
MEMORY
B-DAT
+B overcurrent (OCP)Occurs when an overcurrent on the +B (115V) line is detected by pin 18 of IC301. If the voltage
of pin 18 of IC 301 is less than 1V when V.SYNC is more than seven verticals in a period, the
unit will automatically turn off.
Vertical deflection stoppedOccurs when an absence of the vertical deflection pulse is detected by pin 17 of IC001. Power
supply will shut down when waveform interval exceeds 2 seconds.
White balance failureIf the RGB levels* do not balance within 2 seconds after the power is turned on, 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 1K.)
— 6 —
Page 7
SAFETY CHECK-OUT
KV-20FV10/21FV10/21FV10C/25FV10A
After correcting the original service problem, perform the
following saf ety 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-w attage resistors.
3. Check that all control knobs, shields, covers, ground
straps, and mounting hardware have been replaced.
Be absolutely certain that you 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. Make sure your instruments are accurate;
be suspicious of your HV meter if sets always have
low HV.
8. Check the antenna terminals, metal trim, “metallized”
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as descr ibed below.
Leakage Test
The AC 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. A commercial leakage tester, such as the Simpson
229 or RCA WT-540A. Follow the manufacturers'
instructions to use these instructions.
2. A battery-operated AC 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-operated A C v oltmeter .
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 are suitable . Nearly all battery-operated
digital multimeters that have a 2 VAC range are
suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the coverplate retaining screw on most AC outlet boxes is also at
earth ground. If the retaining screw is to be used as y our
earth ground, verify that it is at ground by measuring the
resistance between it and a cold-water pipe with an
ohmmeter. The reading should be zero ohms. If a cold-water
pipe is not accessible, connect a 60- to 100-watt troub lelight (not a neon lamp) between the hot side of the
receptacle and the retaining screw . Try both slots, if
necessary , to locate the hot side on the line; the lamp should
light at normal brilliance if the screw is at ground potential
(see Figure B).
0.15 F
To Exposed Metal
Parts on Set
1.5 k
Earth Ground
AC
Voltmeter
(0.75 V)
— 7 —
Trouble Light
AC Outlet Box
Figure B. Checking for earth ground.Figure A. Using an AC voltmeter to check AC leakage.
Ohmmeter
Cold-water Pipe
Page 8
4
Connecting Additional Equipment
TV and VCR
1
Connect the coaxial cable from your TV antenna or cable TV to the IN
jack on your VCR.
2
Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF IN jack on the TV.
(Optional connection)
3
If your VCR is equipped with video inputs, for better picture quality
you should connect A/V cables from AUDIO and VIDEO OUT on
your VCR to AUDIO/VIDEO IN on your TV. You can use the
button to switch between the TV and VCR inputs.
✍
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.
(Optional connection)
VCR
TV
2
1
3
From
Cable/antenna
SECTION 1 GENERAL
KV-20FV10/21FV10/21FV10C/25FV10A
The instructions mentioned here are partial abstracts from the Operating Instruction Manual.
The page numbers shown reflect those of the Operating Instruction Manual.
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.
— 8 —
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, it will be necessary to
adjust the orientation of the antenna for best reception.
3
Page 9
TV and Cable Box
6
TV, VCR, and Cable box
1
Connect the coaxial cable from the wall 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 IN jack on your VCR.
3
Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF IN jack on the TV.
(Optional connection)
4
If your VCR is equipped with video inputs, for better picture quality
you should connect A/V cables from AUDIO and VIDEO OUT on
your VCR to AUDIO/VIDEO IN on your TV. You can use the
button to switch between the TV and VCR inputs.
✍
If you will be controlling all channel selection through your cable box, you
should consider using the CHANNEL FIX feature on page 20.
✍
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.
3
TV
Cable
4
(Optional connection)
Cable box
1
VCR
2
1
Connect the coaxial cable from the wall to the IN jack on your cable
box.
2
Connect a coaxial cable (not supplied) from the OUT jack on your
— 9 —
cable box to the VHF/UHF IN 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).
✍
If you will be controlling all channel selection through your cable box, you
should consider using the CHANNEL FIX feature on page 20.
KV-20FV10/21FV10/21FV10C/25FV10A
5
Page 10
TV and Digital Satellite Receiver
8
TV, Digital Satellite Receiver and VCR
1
Connect the cable from your satellite antenna to SATELLITE IN on
the satellite receiver.
2
Attach the coaxial connector from your cable or antenna to
VHF/UHF IN on your VCR.
3
Using a coaxial cable, connect VHF/UHF OUT on your VCR to
VHF/UHF on your TV.
4
Using A/V connectors, connect AUDIO and VIDEO OUT on your
satellite receiver to AUDIO and VIDEO IN on your VCR.
5
Using A/V connectors, connect AUDIO and VIDEO OUT on your
VCR to AUDIO and VIDEO IN on your TV.
✍
To view from the satellite or VCR, select the video input to which your
satellite receiver or VCR is connected by pressing on the remote
control.
Satellite receiver
4
5
2
3
1
Cable
TV
VCR
Satellite
antenna
2
From
cable/
antenna
KV-20FV10/21FV10/21FV10C/25FV10A
TV
1
Satellite
antenna
cable
— 10 —
1
Connect the cable from your satellite antenna to SATELLITE IN on
the satellite receiver.
2
Attach the coaxial connector from your cable or antenna to
VHF/UHF on your TV.
3
Using A/V connectors, connect AUDIO and VIDEO OUT on your
satellite receiver to AUDIO and VIDEO IN on your TV.
✍
You can use the
✍
For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, your audio connectors must still be
connected.
Satellite receiver
3
button to switch between the satellite receiver and TV.
7
Page 11
Connecting a Camcorder
10
Connecting an audio system
Using audio connectors, connect AUDIO OUT on your TV to one of the
unused line inputs (e.g. TV, AUX, TAPE 2) on your stereo.
✍
Set your stereo to the chosen line input. See page 16 for additional audio
setup instructions.
AUDIO-L
AUDIO-R
Line
input
1
2
Using A/V cables, connect AUDIO and VIDEO OUT on your camcorder
to AUDIO and VIDEO IN on your TV.
(Front A/V Panel)
— 11 —
Connecting a DVD Player
Using A/V connectors, connect LINE OUT on your DVD to 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, your audio connectors must still be
connected.
A/V output
(Rear of DVD player)
A/V outputs
(Rear of TV)
KV-20FV10/21FV10/21FV10C/25FV10A
9
Page 12
Using the Remote Control and
12
Cycles through available AUTO
VOLUME settings (see page 16).
JUMPAlternates back and forth
between the last two channels
selected with the buttons.
GUIDEBrings up the custom guide of
your satellite receiver.
MENUDisplays the on-screen menu.
Press again to exit the menu at
any time.
RESETPress to return to factory settings
while in the on-screen menu.
CODE SETUse to program your remote
control to operate connected
video equipment, (see page 29).
Basic Functions
This section shows you how to use more advanced buttons on the remote
control and how to use the on-screen menus.
KV-20FV10/21FV10/21FV10C/25FV10A
-
— 12 —
ButtonDescription
POWERPress when you want to turn
FUNCTIONPress when you want to control
MUTINGInstantly turns off the sound.
SYSTEM OFFPowers off all Sony equipment at
TV/VIDEOCycles through available video
PICTURE MODECycles through the available
SLEEPTurns the TV off automatically in
MTS/SAPCycles through the Multi-
DISPLAYPress once to show current time,
connected equipment on and off.
connected equipment with your
remote control.
Press again or press to restore
sound.
once.
inputs.
Moves the cursor in the onscreen menus. Press the arrow
buttons to move the cursor, press
the center button to select or
access an option.
VIDEO MODE settings.
approximately 30, 60 or 90
minutes. Cancel by pressing until
SLEEP OFF appears.
channel TV Sound (MTS)
options: STEREO, SAP (Second
Audio Programming), MONO.
(if set) and channel number.
Press again to activate CAPTION
VISION settings, if available. To
cancel, press again until
DISPLAY OFF appears.
11
Page 13
Troubleshooting
33
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). (416) 499-SONY (7669) (Canadian residents only).
Cable stations
don’t seem to
work
❏ Make sure CABLE is set to ON in the SET UP menu
(page 20).
❏ Use AUTO PROGRAM to add channels that are not
presently in the memory (page 20).
Remote
Control 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.
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
— 13 —
Poor or no
picture, good
sound
Good picture,
no sound
No color❏ Adjust COLOR in the VIDEO menu (page 15).
Only snow
appears on the
screen
Dotted lines or
stripes
Double images
or ghosts
Cannot receive
higher number
channels (UHF)
when using an
antenna
❏ Make sure the power cord is plugged in.
❏ If a red light is flashing on the front of your TV for
more than a few minutes, call your local service center.
❏ Check your PARENTAL CONTROL settings, (pages
25-26).
❏ Check the TV/VIDEO settings: when watching TV, set
to TV; when watching video equipment, set to VIDEO
(page 15).
❏ Make sure the batteries have been inserted correctly
into the remote control.
❏ Try another channel, it could be station trouble.
❏ Adjust PICTURE in the VIDEO menu (page 15).
❏ Adjust BRIGHTNESS in the VIDEO menu (page 15).
❏ Check the antenna and/or cable connections (page 3).
❏ Press so that MUTING disappears from the
screen (page 11).
❏ Check your AUDIO settings. Your TV may be set to
SAP (page 16).
❏ Check the CABLE setting in the SET UP menu
(page 20).
❏ Check the antenna and/or cable connections (page 3).
❏ Make sure the channel selected is currently
broadcasting.
❏ Adjust the antenna.
❏ Move the TV away from other electronic equipment.
Some electronic equipment can create electrical noise,
which can interfere with TV reception.
❏ Check your outdoor antenna or call your cable service.
❏ Make sure CABLE is set to OFF in the SET UP menu
(page 20).
❏ Use AUTO PROGRAM to add channels that are not
presently in the memory (page 20).
KV-20FV10/21FV10/21FV10C/25FV10A
32
Page 14
KV-20FV10/21FV10/21FV10C/25FV10A
2-1. REAR COVER REMOVAL
SECTION 2
DISASSEMBLY
KV -25FV10A
Rear Cover
Six Screws
(+BVTP 4x16)
Two Screws
(+BVTP 3x10)
KV-20FV10/21FV10/21FV10C
Rear Cover
Four Screws
(+BVTP 4x16)
Two Screws
(+BVTP 3x10)
2-2. A BOARD REMOVAL2-3. SERVICE POSITION
C Board
G Board
A Board
G Board
V Board
HZ Board
(KV-25FV10A ONLY)
A Board
C Board
V Board
HZ Board
(KV-25FV10A ONLY)
— 14 —
Page 15
2-4. PICTURE TUBE REMOVAL
G Board
A Board
Cushion
Degaussing Coil
Neck Assy.
Deflection Yoke
Anode Cap
C Board
Picture Tube
Tension Spring (B)
Tuner
V Board
Speaker
Speaker
Tapping Screw
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT even
after the power is disconnected. T o
avoid electric shock, discharge CR T
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
Coated
Earth
Ground
Strap
KV-20FV10/21FV10/21FV10C/25FV10A
ANODE CAP REMOVAL
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electrical shock, discharge the CRT before
NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield,
attempting to remove the anode cap. Short between anode and coated earth ground strap of CRT.
or carbon painted on the CRT.
REMOVAL PROCEDURES
c
b
a
Anode Button
1
Turn up one side of the rubber cap in
the direction indicated by arrow
2
Use your thumb to pull the rubber
a
.
cap firmly in the direction indicated
by arrow
b
.
3
When 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
.
HOW TO HANDLE AN ANODE CAP
1
Do not use sharp objects which may cause damage to the
surface of the anode cap.
2
To 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.
3
Do not force turn the foot of the rubber cover. This may cause
the shatter-hook terminal to protrude and damage the rubber.
— 15 —
Page 16
KV-20FV10/21FV10/21FV10C/25FV10A
SET-UP ADJUSTMENTS
SECTION 3
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: ST ANDARD
PICTURE control ................. Normal
BRIGHTNESS control ......... Normal
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.
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Note: T est equipment required:
• Color bar pattern generator
• Degausser
• DC power supply
• Digital multimeter
5. Move the deflection yoke forward and adjust so that the entire
screen becomes green.
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
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.
Purity control
corrects this area
ba
Disk magnets
or rotatable disk
cd
Deflection yoke positioning
corrects these areas
b
d
magnets correct
these areas (a-d)
a
c
— 16 —
Page 17
KV-20FV10/21FV10/21FV10C/25FV10A
3-2. CONVERGENCE
Before starting convergence adjustments:
1. Perform FOCUS, V.LIN AND V.SIZE adjustments.
2. Set BRIGHTNESS control to minimum.
3. Feed in dot pattern.
Vertical Static Con vergence
1. Adjust V.STAT magnet to converge red, green and blue dots in
the center of the screen. (V ertical movement adjust V.STA T
R V to converge.)
Center dot
R G B
R
G
B
V.STAT magnet
RV1750
V.STAT
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.
PURITY
V. STAT
BMC MAGNET
BMC magnet
a
2. Tilt the V.ST AT 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:
(1)
a
b
(2)
a
(3)
b
b
b
a
b
a
B
G
R
BGR
RGB
R
G
B
b
B
G
R
B
G
R
b
Dynamic Convergence Adjustment
Before performing this adjustment, perform Horizontal
and Vertical Static Conver gence Adjustment.
1. Slightly loosen deflection yoke screw.
2. Remove deflection yoke spacers.
3. Move the deflection yoke for best convergence,
as shown below:
BGR
R
B
G
G
R
B
RGB
RGB
BGR
RGB
B
G
R
G
B
4. Tighten the deflection yoke screw .
5. Install the deflection yoke spacers.
R
R
G
B
BGR RGB
— 17 —
Page 18
KV-20FV10/21FV10/21FV10C/25FV10A
Focus (FV)
Screen (G2)
TLH Plate Adjustment
• Input crosshatch pattern.
• Adjust PICTURE QUALITY to standard, PICTURE and
BRIGHTNESS to 50%, and OTHER to standard.
• Adjust the Horizontal Convergence of red and blue dots
by tilting the TLH plate on the deflection yoke.
YCH
TLV
XCV
C Board
V Board
(TLV)
TLH Plate
RV1750
V.STAT
3-3. FOCUS
1. Adjust FOCUS control for best picture.
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 VDC.
B R R B
(R)(B) (B)(R)
TLH+
TLH-
1. Adjust XCV core to balance X axis.
2. Adjust YCH VR to balance Y axis.
3. Adjust vertical red and blue convergence with V.TIL T
(TL V VR).
Perform adjustments while tracking items 1 and 2.
Screen-Corner Convergence
1. Affix a permalloy assembly corresponding to the
misconverged areas.
b
ba
a-d: screen-corner
misconvergence
cd
a
Pedestal
Ground
170 VDC
4. Observe the screen and adjust SCREEN (G2) VR in FBT
to obtain the faintly visible background of dot signal.
c
d
— 18 —
Page 19
3-5. METHOD OF SETTING THE SERVICE
ADJUSTMENT MODE
Service Mode Procedure
1. Standby mode (power off).
KV-20FV10/21FV10/21FV10C/25FV10A
2.
DisplayChannel
5
Sound volumePower
+
on the Remote Commander (press each button within a
second).
Service Adjustment Mode In
1. The CRT displays the item being adjusted.
Disp.
Item
( tem)
Data
SERVICE HSIZ 0
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 WRITE
MUTING
ENTER
Green
Red
3-6. WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal with burst.
2. Set to Service Adjustment Mode.
3. Set DCOL to “0”.
4. Set the PICTURE and BRIGHTNESS to minimum.
5. Adjust with SBRT if necessary.
6. Select GCUT and BCUT with
7. Adjust with
and for the best white balance.
8. Set PICTURE and BRIGHTNESS to maximum.
9. Select GDR V and BDRV with
10.Adjust with
and for the best white balance.
11.Reset DCOL to “1”.
12. T o write into memory, press
and .
and .
then .
— 19 —
Page 20
KV-20FV10/21FV10/21FV10C/25FV10A
SAFETY RELATED ADJUSTMENTS
SECTION 4
4-1.
R582 AND R584 (R584 for KV-25FV10A
ONLY)CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
The following adjustments should always be performed when
replacing the following components which are marked with
1. Using a V ariac, apply AC input voltage: 120 ± 2 VAC
(or 120-220 ± 2 V AC for KV-21FV10/21FV10C/25FV10A
only).
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 C574 (+) or TP503
and ground is more than 105 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 = 100 ± 100 mA.
3. Confirm the voltage of A Board TP-600 is 135 ± 3 VDC.
4. Connect the digital voltmeter and the DC power supply
via diode 1SS119 to C574 (+) 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: 115.7 ± .3 VDC)
(standard: 138.0 ± .3 VDC KV-25FV10A ONLY).
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 1350 ± 100 mA
IABL = 1650 ± 100 mA (KV-25FV10A ONLY)
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 R582 and/or R584 components
marked with
.
T505
FBT
ammeter
3 0 mA DC
range
ABL
+
A
IABL
-
4-2. B+ VOL TAGE 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 the G Board.
G BOARD:IC601, PH600
1. Using a V ariac, apply AC input voltage: 130 ± 2 VAC (or 120220 ± 2 V AC for KV -21FV10/21FV10C/25FV10A only).
2. Input a dot signal.
3. Set the PICTURE and BRIGHTNESS controls to minimum.
4. Confirm that the voltage of A Board TP-600 is 135 ± 3 V AC.
5. If step 3 is not satisfied, replace the components listed above,
then repeat steps 1–3.
— 20 —
Page 21
TP600
KV-20FV10/21FV10/21FV10C/25FV10A
DIGITAL
MULTIMETER
+
–
ABL11
AMMETER
3mA dc range
A
+
–
T505
FBT
Figure 1
POWER
SUPPLY
+
–
R582
R584
C574
DIGITAL
MULTIMETER
1SS119
+
–
— 21 —
Page 22
KV-20FV10/21FV10/21FV10C/25FV10A
CIRCUIT ADJUSTMENTS
ELECTRICAL ADJUSTMENTS BY REMOTE COMMANDER
Use the Remote Commander (RM-Y168) to perform the circuit adjustments in this section.
NOTE: T est Equipment Required:
• Pattern generator
• Frequency counter
• Digital multimeter
• Audio oscillator
SECTION 5
5-1. Setting the Service Adjustment Mode
1. Standby mode (power off).
2.
DisplayChannel
5
Sound volumePower
+
on the Remote Commander (press each button within a
second).
Service Adjustment Mode On
1. The CRT displays the item being adjusted.
Disp.
Item
( tem)
Data
SERVICE HSIZ 0
2. Press or on the Remote Commander to select an item.
3. Press
4. Press
or on the Remote Commander to change the data.
then to save into the memory.
Service Adjustment Mode Memory
SERVICE WRITE
MUTING
ENTER
Green
Red
5-2. Memory Write Confirmation Method
1. After adjustment, remove the power plug from the AC outlet,
then plug it in again.
2. Turn the power switch ON and set to service mode.
3. Call the adjusted items again to confirm they were adjusted.
5-3. Adjustment Buttons and Indicators
MTS/SAP
2
5
8
0
POWER
3
6
9
TV
POWER
3
5
6
ENTER
MUT NG
DISPLAY
MUT NG
VTR/DVD SA T/CABLE
SYSTEM
TV/VTR
1
4
8
—— FUNCTION ——
VTR/DVD SA T/CABLE TV
OFF
PICTURE
SLEEPDISPLAY
MODE
1
4
7
JUMPENTER
1. Press then on the Remote Commander to
initialize.
SERVICE RESET
Carry out step 1 when adjusting
IDs 0–4 and when replacing
and adjusting IC003.
2. Turn set off then on to exit service adjustment mode.
20VZOM 16:9 CRT Z MODE ON/OFF0, 100
21EHTVRT HI-VOLT. CORRECTION0-1566
22ASPASPECT RATIO CONTROL0-634747
23SCRL 16:9 CRT Z MODE TRANS SCROLL0-633131
24HBLK HORIZONTAL BLANKING ON/OFF0, 111
25LBLK LEFT BLANKING ADJ.0-151212
26RBLK RIGHT BLANKING ADJ.0-1555
27VUSN V SAW W AVEFORM COMPRESS0, 100
28HDW H. DRIVE PULSE WIDTH0, 111
29EWDC “PARABOLA” EW/DC ADJ.0, 100
30LVLN LOWER SCREEN BTM VRT LIN ADJ.0-1500
31UVLN UPPER SCREEN BTM VRT LIN ADJ.0-1500
32RDRV R OUTPUT DRIVE CONTROL0-633136
33GDRV G OUTPUT DRIVE CONTROL0-63252126
34BDRV B OUTPUT DRIVE CONTROL0-63252125
35RCUT R OUTPUT CUTOFF CONTROL0-15108
36GCUT G OUTPUT CUTOFF CONTROL0-15766
37BCUT B OUTPUT CUTOFF CONTROL0-1567
38DCOL DYNAMIC COLOR ON/OFF0, 101
39SHUE SUB HUE0-31141215
40SCOL SUB COLOR0-311 415
41SBRT SUB BRIGHTNESS0-31151315
42RONR OUTPUT ON/OFF0, 111
43GONG OUTPUT ON/OFF0, 111
44BONB OUTPUT ON/OFF0, 111
45AXPL AXIS PAL0, 100
46AXNT AXIS NTSC0, 100
47CBPF CHROMA BPF ON/OFF0, 101
48CTRP Y TRAP FILTER ON/OFF0, 111
49COFF COLOR ON/OFF0, 100
50K OFF SET COLOR KILLER0, 100
51SSHP SUB SHARPNESS0-15677
52SHPF SHARPNESS CIRC UIT F00, 111
53PREL PRE/OVR SHOOT SWITCHING0, 111
54Y-DCDC TRA NS RATIO SWITCHING0, 111
55GAMM GAMMA CORRECTION AMNT0-31Palette mode controls this register1
56ABLM ABL MODE SWITCHING0, 111
57VTHABL CD VHT SWITCHING0, 111
58YDEL Y DELAY TIME CONTROL0-1577
59NCOL NO COLOR ID0, 111
60FSCFSC OUT ON/OFF0, 111
61K-IDKILLER ID CONTROL SW0, 100
RANGE
NTSC
20”25”20”25”
PALNVIDEO
AVERAGE
DAT A
— 23 —
Page 24
KV-20FV10/21FV10/21FV10C/25FV10A
SERVICE ID0 25
NO.ITEMFUNCTION
62HOSC H VCO OSCILLATION FREQ0-1577
63VSSV SYNC SLICE LEVEL0, 1100
64HSSH SYNC SLICE LEVEL0, 100
65HMSK0, 100
66VTMS SELECT SIGNAL V TIM PIN0 -300
67CDMD V CNT DWN MODE SWITCHING0-3030
68AFCAFC LOOP GAIN SWITCHING0-3000
69FIFRFIEL D FREQUENCY0-3313
70SBAL SUB BALANCE0-1577
71SBAS SUB BASS0-1599
72STRE SUB TREBLE0-1599
73BBEL BBE LOW0-151212
74BBEH BBE HIGH0-1599
75SRND SURROUND0-631313
76BBEBBE ON/OFF0, 111
77DISP O.S.D DISPLAY POSITION0-6322515
78TROT TILT CORRECTION0-633131
79HCLW HORIZONTAL COUNT LOWER LIMIT0-127161616
80HCHG HORIZONTAL COUNT HIGH LIMIT0-127646464
81ABL00, 101
82ABL10-707
83SYSC COLOR SYSTEM0-766
84VENH VERTICAL ENHANCEMENT0-74Palette mode controls this register4
85CBPC0, 100
86BYCF0, 100
87KILC0, 100
88LDOT0, 100
89CORE0, 100
90ID00-255201See ID Map
91ID10-25519See ID Map
92ID20-255173See ID Map
93ID30-25543See ID Map
94ID40-255251See ID Map
95ID50-2550See ID Map
96ID60-25564See ID Map
DATA
RANGE
INITIAL DATA
NTSC
20”25”20”25”
PALM/
PALNVIDEO
AVERAGE
DAT A
Notes:
No. 1–96 show the order that each adjustment mode may be selected while in service mode.
Data Range shows the range of possible settings for each adjustment mode.
Initial Data shows the standard settings for each adjustment mode.
•All capacitors are in µF unless otherwise noted.
pF: µµF 50 WV or less are not indicated except for
electrolytic and tantalums.
•All electrolytics are 50V unless otherwise specified.
•Indication of resistance, which does not have one for
rating electrical power, is as follows:
Pitch: 5mm
Rating electrical power 1/4W (CHIP: 1/10W)
•All resistors are in ohms.
KΩ = 1000Ω MΩ = 1000KΩ
•
•
•
•
•
•
•All variable and adjustable resistors have characteristic
•The components identified by
•When replacing components identified by
:nonflammable resistor
:fusible resistor
:internal component
:panel designation and adjustment for repair
:earth-ground
:earth-chassis
curve B, unless otherwise noted.
in this manual have been
carefully factory-selected for each set in order to satisfy
regulations regarding X-ray radiation. Should replacement
be required, replace only with the value originally used.
, make the
necessary adjustments indicated. If results do not meet
the specified value, change the component identified
by
and repeat the adjustment until the specified value
is achieved (refer to Safety Related Adjustments on
page20)
IC601, PH600...................G Board
•All voltages are in Volts
•Voltage is DC with respect to ground unless otherwise
noted.
•Readings are taken with a 10MΩ digital multimeter.
•Readings are taken with a color-bar signal input.
•Voltage variations may be noted due to normal production
tolerance.
•Circled numbers are waveform references.
•* :cannot be measured
•
•
•
Reference Information
RESISTOR : RN METAL FILM
COIL : LF-8L MICRO INDUCTOR
CAPACITOR : TA TANTALUM
Note:
The components identified by shading and mark
are critical for safety. Replace only with the part
number specified.
The symbol
circuit board) indicates fast operating fuse. Replace
only with fuse of the same rating as marked.
Les composants identifiés per un tramé et une marque
sont critiques pour la sécurité. Ne les remplacer que
par une piéce portant le numéro spécifié.
Le symbole
Doit etre remplacee par une fusible de meme yaleur,
comme marque.
-----
:B + Line
:B − Line
:Signal path
: RC SOLID
: FPRD NON FLAMMABLE CARBON
: FUSE NON FLAMMABLE FUSIBLE
: RW NON FLAMMABLE WIREWOUND
: RS NON FLAMMABLE METAL OXIDE
: RB NON FLAMMABLE CEMENT
:
: PS STYROL
: PP POLYPROPYLENE
: PT MYLAR
: MPS METALIZED POLYESTER
: MPP METALIZED POLYPROPYLENE
: ALB BIPOLAR
: ALT HIGH TEMPERATURE
: ALR HIGH RIPPLE
• Items marked * are not stocked since
they are seldom required for routine
service. Some delay should be
anticipated when ordering these items.
Les composants identifies per un trame et une marque
sont critiques pour la securite. Ne les remplacer que par
une piece portant le numero specifie.
24
31
20
32
18
17
16
15
14
13
12
19
8
21
29
29
33
23
25
26
22
28
REF. NO. PART NO.DESCRIPTIONREMARKREF. NO. PART NO.DESCRIPTIONREMARK
1X-4036-880-1BEZNET ASSY2-6
24-046-161-01EMBLEM (NO.8), SONY
34-068-307-01BUTTON, MULTI
44-068-308-01GUIDE, LED
54-068-309-01BUTTON, FUNCTION
64-068-306-01DOOR
74-057-714-01PIECE ASSY, TLH CORRECTION
81-416-864-11COIL, VM
93-704-372-31HOLDER, HV CABLE
101-452-728-51COIL, NA ROTATION (RT-154)
118-738-822-05CRT 21RSN (FOR NORTH AMERICA)
(20FV10/21FV10)
118-738-823-05CRT 21RSN (FOR EQUATORIAL AREA)
(21FV10C ONLY)
124-053-005-01SPACER, DY
138-451-505-11DY Y21RSA-S
14A-1342-497-A V MOUNTED PC BOARD
15*A-1331-965-A C MOUNTED PC BOARD
164-036-329-01SPRING (B), TENSION
171-419-287-11COIL, DEGAUSS NG (20FV10 ONLY)
171-419-288-11COIL, DEGAUSSING (21FV10/21FV10C ONLY)
18*A-1311-782-A G (VAR) MOUNTED PC (20FV10 ONLY)
18*A-1311-807-A G (VAR) MOUNTED PC (21FV10/21FV10C ONLY)
19*A-1298-960-A A COMPLETE PC BOARD
(20FV10/21FV10 ONLY)
19*A-1298-998-A A COMPLETE PC BOARD (21FV10C ONLY)
201-769-796-71CORD, POWER (WITH CONNECTOR)
(21FV10C ONLY)
201-790-001-21CORD, AC POWER (WITH CONNECTOR)
(21FV10 ONLY)
201-791-229-11CORD, NOISE F LTER WITH POWER
64-068-306-01DOOR
74-057-714-01PIECE ASSY, TLH CORRECTION
88-453-011-21NECK ASSEMBLY NA299-S
93-704-372-31HOLDER, HV CABLE
101-452-896-11CO L, N A ROTATION (RT200)
118-733-250-05CRT 25 RSN
124-053-005-01SPACER, DY
131-451-475-11DEFLECTION YOKE (Y25RSA)
14*A-1342-465-A V MOUNTED PC BOARD
15*A-1331-898-A C MOUNTED PC BOARD
164-036-329-01SPRING (B), TENSION
171-419-104-11CO L, ALUM NIUM DEMAGNETIZATION
18*A-1311-754-A G (VAR) MOUNTED PC
19*A-1298-794-A A COMPLETE PC BOARD
201-783-838-31CORD, POWER (WITH CONNECTOR)
33*A-1372-117-A MOUNTED PWB, HZ
344-069-764-01BUTTON, MA N POWER
354-052-635-01MA N POWER BRACKET
— 51 —
Page 36
KV -20FV10/21FV10/21FV10C/25FV10A
ELECTRICAL PARTS LIST
SECTION 8
Note:
The components identified by shading
and mark
only with part number specified.
Note:
Les composants identifies per un trame et
une marque
securite. Ne les remplacer que par une piece
portant le numero specifie.
are critical for safety . Replace
sont critiques pour la
• The components identified by in this
manual have been carefully factoryselected for each set in order to satisfy
regulations regarding X-ray radiation.
Should replacement be required, replace
only with the value originally used.
• Items marked * are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• All variable and adjustable resistors have
characteristic curve B, unless otherwise
noted.
RESISTORS
• All resistors are in ohms
• F : nonflammable
When indicating parts by reference
number, please include the board name.
REF. NO.PART NO.DESCRIPTIONREMARKREF. NO. PART NO.DESCRIPTIONREMARK
The components identified by in this manual have been
carefully factory-selected for each set in order to satisfy
regulations regarding x-ray radiation. Should replacement
be required, replace only with the value originally used.