Sony KV-21FS105 User manual

TRINITRON®COLOR TELEVISION
SERVICE MANUAL BA-5 CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION
9-965-958-01
KV-21FS105 RM-Y173 BRAZIL
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
ORIGINAL MANUAL ISSUE DATE: 3/2004
ALL REVISIONS AND UPDATES TO THE ORIGINAL MANUAL ARE APPENDED TO THE END OF THE PDF FILE.
REVISION DATE SUBJECT
3/2004 No revisions or updates are applicable at this time.

TRINITRON®COLOR TELEVISION
SERVICE MANUAL BA-5 CHASSIS
MODEL NAME REMOTE COMMANDER DESTINATION
9-965-958-01
KV-21FS105 RM-Y173 BRAZIL
Self Diagnosis
Supported model
KV-21FS105 RM-Y173

3
KV-21FS105
KV-21FS105
TABLE OF CONTENTS
SECTION TITLE PAGE
SPECIFICATIONS ...................................................................................................................... 4
WARNINGS AND CAUTIONS .................................................................................................... 5
SAFETY CHECK-OUT ............................................................................................................... 6
SELF-DIAGNOSTIC FUNCTION ............................................................................................... 7
SECTION 1: DISASSEMBLY............................................................................................................. 9
1-1. Rear Cover Removal.......................................................................................................... 9
1-2. Chassis Assembly Removal............................................................................................... 9
1-3. Service Position ................................................................................................................. 9
1-4. Picture Tube Removal...................................................................................................... 10
Anode Cap Removal Procedure....................................................................................... 10
SECTION 2: SET-UP ADJUSTMENTS.............................................................................................11
2-1. Beam Landing ...................................................................................................................11
2-2. Convergence.................................................................................................................... 12
2-3. Focus ............................................................................................................................... 13
2-4. Screen (G2)...................................................................................................................... 13
2-5. Method of Setting the Service Adjustment Mode ............................................................. 14
2-6. White Balance Adjustments ............................................................................................. 14
SECTION 3: SAFETY RELATED ADJUSTMENTS......................................................................... 15
3-1.
X R562 Confirmation Method (Hold-Down Confirmation) and Readjustments .............. 15
3-2. B+ Voltage Confirmation and Adjustments....................................................................... 15
SECTION 4: CIRCUIT ADJUSTMENTS.......................................................................................... 17
4-1. Setting Service Adjustment Mode .................................................................................... 17
4-2. Memory Write Confirmation Method ................................................................................ 17
4-3. Remote Adjustment Buttons and Indicators ..................................................................... 17
4-4. Service Data Lists ............................................................................................................ 18
4-5. ID Map Table .................................................................................................................... 19
4-6. MB Board Adjustments..................................................................................................... 20
SECTION 5: DIAGRAMS................................................................................................................. 23
5-1. Circuit Boards Location ....................................................................................................23
5-2. Printed Wiring Boards and Schematic Diagrams Information .......................................... 23
5-3. Block Diagrams and Schematics ..................................................................................... 24
Block Diagrams (1 of 2).................................................................................................... 24
Block Diagrams (2 of 2).................................................................................................... 25
A Board Schematic Diagram ............................................................................................ 26
MB Board Schematic Diagram......................................................................................... 30
CB Board Schematic Diagram ......................................................................................... 33
5-4. Semiconductors ............................................................................................................... 36
SECTION 6: EXPLODED VIEWS .................................................................................................... 37
6-1. Chassis ............................................................................................................................ 37
SECTION 7: ELECTRICAL PARTS LIST....................................................................................... 38

4
KV-21FS105
KV-21FS105
Television system
American TV Standard NTSC, PAL-M, PAL-N
Channel coverage
VHF: 2-13/ UHF: 14-69/ CATV: 1-125
Picture tube
FD Trinitron
®
tube
Visible screen size
20 inch picture measured diagonally
Actual screen size
21 inch measured diagonally
Antenna
75-ohm external antenna terminal for VHF/UHF
Supplied Accessories
Remote Control RM-Y173 (1)
Size AA (R6) batteries (2)
Optional Accessories
Connecting cables: VMC-810S/820S, VMC-720M, YC-15V/30V, RK74A
U/V Mixer EAC-66
SPECIFICATIONS
Design and specifications are subject to change without notice.
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) 500 m Vrms (100% modulation), Impedance: 47 kilohms
4
) More than 408 mVrms at the maximum volume setting (variable)
More than 408 mVrms (fix)
KV-21FS105
Power requirements 110-220V, 50/60Hz
Number of Inputs/Outputs
Video 1) 2
S Video 2) 1
Audio 3) 2
Audio Out 4) --
Speaker output (W) 5W x 2
Power Consumption (W)
In use (Max) 115W
In Standby 1W
Dimensions(W/H/D)
mm 512x 475 x 493mm
in 20 1/8 x 18 11/16 x 19 7/16
Mass
kg 24.5 kg
lbs 54 lbs
SRS (SOUND RETRIEVAL SYSTEM)
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 trade-
marks 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.
TruSurround™
by SRS ®
TruSurround is a trademark of SRS Labs, Inc. SRS and the SRS
symbol are registered trademarks of SRS Labs, Inc. in the United
States and in select foreign countries. SRS and TruSurround are
incorporated under license from SRS Labs, Inc. and are protected
under United States Patent Nos. 4,748,669 and 4,841,572 with
numerous additional issued and pending foreign patents. Pur-
chase of this product does not convey the right to sell recordings
made with the TruSurround technology.

5
KV-21FS105
KV-21FS105
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 schematic diagrams, exploded views, 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 are critical for safe operation are identified in this manual. Follow these procedures whenever critical
components are replaced or improper operation is suspected.

6
KV-21FS105
KV-21FS105
SAFETY CHECK-OUT
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 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
described 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 milliampmeter. 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 AC 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 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 cover-plate retaining
screw on most AC outlet boxes is also at earth ground. If the retaining
screw is to be used as your 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 trouble-
light (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).
To Exposed Metal
Parts on Set
AC Voltmeter
(0.75 V)
Earth Ground
0.15 µ F1.5
kΩ
g
AC Outlet Box Ohmmeter
Cold-water Pipe
Figure A. Using an AC voltmeter to check AC leakage. Figure B. Checking for earth ground.

7
KV-21FS105
KV-21FS105
SELF-DIAGNOSTIC FUNCTION
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
3sec.
Diagnostic Item Flash Count*
+B Overcurrent 2 times
V-STOP 4 times
White Balance Failure 5 times
*One flash count is not used for self-diagnostic.
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.
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. If the screen displays a “0”, an error has occurred.
Diagnostic Item
Description
No. of Times
STANDBY/TIMER
LED Flashes
Self-Diagnostic Display/
Diagnostic Result
Probable Cause
Location Detected Symptoms
Power does not turn on Does not light • Power cord is not plugged in.
• Fuse is burned out. (F601) (A Board)
• Power does not come on.
• No power is supplied to the TV.
• AC power supply is faulty.
+B overcurrent (OCP)* times 2:0 or 2:1 • H.OUT (Q502) is shorted. (A Board)
• IC702 is shorted. (CB Board)
• Power does not come on.
• Load on power line is shorted.
Vertical deflection stopped* times 4:0 or 4:1 • +12V is not supplied. (A Board)
• IC502 is faulty. (A Board)
• Has entered standby state after horizontal raster.
• Vertical deflection pulse is stopped.
• Power line is shorted or power supply is stopped.
White balance failure
(not balanced)
5 times :0 or 5:1 • Video OUT (IC502) is faulty. (A Board)
• IC1301 is faulty. (MB Board)
• Screen (G2) is improperly adjusted.**
• No raster is generated.
• CRT cathode current detection reference
pulse output is small.
2
4
5
* 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.
** Refer to Screen (G2) Adjustments in Section 2-4. of this manual.
Self Diagnosis
Supported model
Standby/Timer LED

8
KV-21FS105
KV-21FS105
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 -Power ON.
SELF DIAGNOSIS
2: 0
3: NA 0
4: 0
Numeral “0” means that no fault was detected.
5: NA 1 Numeral “1” means a fault was detected one time only.
101: WDT 0
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
MB BOARD
IC1301
Y/CHROMA JUNGLE
A BOARD
IC507
V. OUT
MB BOARD
IC1001
SYSTEM
MB BOARD
IC1003
MEMORY
IK IN
FROM
CRT 21
HP/PROTECT
SDA
A BOARD
FROM
IC502
PIN 7
18
35 IO-SDAT
O-LED
37
REF 3I-PROT
IO-BDAT
17
36 B-DAT 5
18
DISPLAY
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135V) line is detected by pin 18 of IC1301 (MB Board). If the voltage of pin 18 of IC1301 (MB Board) is less than
1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
Vertical Deflection Stopped
Occurs when an absence of the vertical deflection pulse is detected by pin 17 of IC1001 (MB Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
White Balance Failure
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC1301 (MB Board). TV will stay on, but
there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).

9
KV-21FS105
KV-21FS105
SECTION 1: DISASSEMBLY
1-1. REAR COVER REMOVAL
1-2. CHASSIS ASSEMBLY REMOVAL
1-3. SERVICE POSITION
Screw +BVTP 4x16
Screw +BVTP 4x16
Rear Cover
Screw +BVTP 4x16
Screw +BVTP 4x16
CB Board
A Board
MB Board
Claw MB Board
A Board
CB Board
Extension Cable
for Service
p/n S-1294-965-A

10
KV-21FS105
KV-21FS105
1. Discharge the anode of the CRT and remove the anode
cap.
2. Unplug all interconnecting leads from the deflection
yoke, neck assembly, degaussing coils and CRT
grounding strap.
3. Remove the CB Board from the CRT.
4. Remove the chassis assembly.
5. Loosen the neck assembly fixing screw and remove.
6. Loosen the deflection yoke fixing screw and remove.
7. Place the set with the CRT face down on a cushion and
remove 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].
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.
Coated
Earth
Ground
Strap
ab
Anode Button
c
Turn up one side of the rubber cap in
the direction indicated by arrow a .
Use your thumb to pull the rubber
cap firmly in the direction indicated
by arrow b .
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.
1-4. PICTURE TUBE REMOVAL
ANODE CAP REMOVAL PROCEDURE
WARNING: 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. After removing the anode cap, short circuit to either the metal chassis, CRT shield, or carbon painted on the CRT.
NOTE: After removing the anode cap, 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.
REMOVAL PROCEDURES
4
10
6
3
5
7
2
9
8
1

11
KV-21FS105
KV-21FS105
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.
The controls and switch should be set as follows unless otherwise
noted:
PICTURE CONTROL: normal
BRIGHTNESS CONTROL: normal
SECTION 2: SET-UP ADJUSTMENTS
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Test Equipment Required:
1. Color Bar Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
2-1. BEAM LANDING
Preparation:
• Degauss the entire screen.
• Feed in the white pattern signal.
NOTE: Do not use the hand degausser; it magnetizes the CRT .
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 with the purity control
so that green is in the center and red and blue are even on both sides.
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. When landing at the corner is not right, adjust by using the disk
magnets.
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

12
KV-21FS105
KV-21FS105
2-2. CONVERGENCE
Preparation:
• Perform FOCUS, V. LIN and V. SIZE adjustments.
• Set BRIGHTNESS control to minimum.
• Input dot pattern.
Vertical Static Convergence
1. Adjust V. STAT magnet to converge red, green and blue dots in
the center of the screen (Vertical movement adjust V.STAT RV to
converge).
B
G
R
Center dot
V.STAT magnet
RV701 V.STAT
R G B
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:
B
R
G
B
R
G
RG B
G
R
B
G
B
R
BG R
1
2
3
a
b
ab
b
b
a
a
b
ba
b
ab
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.
b
BMC magnet
BMC MAGNET
PURITY
V- S TAT

13
KV-21FS105
KV-21FS105
Dynamic Convergence Adjustment
Before performing this adjustment, perform Horizontal and Vertical Static
Convergence Adjustments.
Preparation:
1. Slightly loosen deflection yoke screw.
2. Remove deflection yoke spacers.
3. Move the deflection yoke for best convergence as shown:
RGB
BGR
R
G
BR
G
B
BGR RGB
RGB
R
R
R
G
B
G
B
G
B
RGB BGR
4 Tighten the deflection yoke screw.
5. Install the deflection yoke spacers.
TLH Plate Adjustment
Preparation:
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.
TLH+
TLH-
B R
(R)(B)
R B
(B)(R)
4. Adjust XCV core to balance X axis.
5. Adjust YCH VR to balance Y axis.
Screen-Corner Convergence
1. Affix a permalloy assembly corresponding to the misconverged areas.
ba
cd
a
b
a-d: screen-corner
misconvergence
c
d
2-3. FOCUS
1. Adjust FOCUS control for best picture.
Focus (FV)
Screen (G2)
2-4. SCREEN (G2)
1. Input dot pattern from the pattern generator.
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.
pedestal
GND
170Vdc
170 +4.0 Vdc
4. Observe the screen and adjust SCREEN (G2) VR in FBT to obtain the
faintly visible background of dot signal.

14
KV-21FS105
KV-21FS105
2-5. METHOD OF SETTING THE SERVICE
ADJUSTMENT MODE
Service Mode Procedure
1. Standby mode (power off).
2. DISPLAY
Î Channel 5 Î Sound Volume + Î Power on the
Remote Commander (Press each button within one second.)
Service Adjustment Mode In
1. The CRT displays the item being adjusted.
SERVICE HSIZ
Display
Item
Mode
Item
Data
0
2. Press 1or 4on the Remote Commander to select the item.
3. Press 3or 6on the Remote Commander to change the data.
4. To save into memory, press MUTING then ENTER .
Service Adjustment Mode Memory
To exit service adjustment mode, turn the set off then on.
ENTER
MUTING
SERVICE WRITE
2-6. WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal with burst.
2. Set to Service Adjustment Mode.
3. Set CDOL to “0”
4. Set the PICTURE and BRIGHTNESS to minimum.
5. Adjust with SBRT if necessary.
6. Select GCUT and BCUT with 1and 4.
7. Adjust by pressing 3and 6for the best white balance.
8. Set the PICTURE and BRIGHTNESS to maximum.
9. Select GDRV and BDRV with 1and 4.
10.Adjust by pressing 3and 6for the best white balance.
11.Reset DCOL to “1”.
12.To save into memory, press MUTING then ENTER .

15
KV-21FS105
KV-21FS105
SECTION 3: SAFETY RELATED ADJUSTMENTS
3-1. X R562 CONFIRMATION METHOD
(HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
Always perform the following adjustments when replacing the following
components marked with a
Y mark on the schematic diagram:
Part Replaced ( ) Adjustment ( )
HV HOLD-DOWN
(R562)
DY, T505, CRT, IC1301, IC501, C507,
C520, C505, C509, C515, T504,
L508, C551, L510, C546, C537,
C547, D517, D518, D519, R560,
R561, R562, R563, R565, R566,
R567, R525........................A Board
Preparation Before Confirmation
1. Using a Variac, apply AC input voltage: 120-220 +/- 2.0 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 of more than 97 VDC appears between
C546(+) or TP503 and ground on the A Board.
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 next page).
2. Input a dot signal and set PICTURE and BRIGHTNESS to minimum:
IABL = 100 ± 100 µA.
3. Confirm the voltage of A Board TP600 is 135 ± 1 VDC.
4. Connect the digital voltmeter and the DC power supply via diode
1SS119 to C546 (+) and ground.
(See Figure 1 on 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 VDC).
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 1350 ± 100 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 the R562 component marked with
X .
+
IABL
ABL
T505
FBT
range
-
ammeter
3.0 mA DC
A
3-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENTS
Always perform the following adjustments when replacing the components
which are marked with
Y on the schematic diagram on the A Board:
A BOARD: IC601, PH601
1. Using a Variac, apply AC input voltage: 130 ± 2.0 VAC
2. Input a dot signal.
3. Set the PICTURE control and the BRIGHTNESS control to minimum.
4. Confirm the voltage on A Board between TP-600 and ground is less
than 136 VDC.
5. If step 4 is not satisfied, replace the components on A Board listed
above, and then repeat the steps 1-4.

16
KV-21FS105
KV-21FS105
T505
FBT
ABL11
R562
AMMETER
3mA dc range
+
–
A
1SS119
C546
DIGITAL
MULTIMETER
+
–
POWER
SUPPLY
+
–
FIGURE 1

17
KV-21FS105
KV-21FS105
4-1. SETTING SERVICE ADJUSTMENT MODE
1. Standby mode (Power off).
2. Press the following buttons on the remote commander within a
second of each other:
DISPLAY Channel 5Sound Volume +Power
Service Adjustment Mode In
1. The CRT displays the item being adjusted.
SERVICE HSIZ
Display
Item
Mode
Item
Data
0
2. Press 1or 2on the Remote Commander to select an item.
3. Press 3or 6on the Remote Commander to change the data.
4. To save into memory, press MUTING then ENTER .
Service Adjustment Mode Memory
ENTER
MUTING
SERVICE WRITE
1. Press 8then ENTER on the Remote Commander to initialize.
Carry out Step 1 when adjusting
ID’s 0-4 and when replacing and
adjusting IC003.
SERVICE RESET
2. To exit Service Adjustment mode, turn set off then on..
SECTION 4: CIRCUIT ADJUSTMENTS
ELECTRICAL ADJUSTMENTS BY REMOTE COMMANDER
Use the Remote Commander (RM-Y173) to perform the circuit adjustments in this section.
Test Equipment Required: 1. Pattern generator 2. Frequency counter 3. Digital multimeter 4. Audio oscillator
4-2. MEMORY WRITE CONFIRMATION
METHOD
1. After adjustment, remove the plug from the AC outlet, then replace the
plug in the AC outlet again.
2. Turn the power switch ON and set to Service Mode.
3. Call the adjusted items again to confirm they were adjusted.
4-3. REMOTE ADJUSTMENT BUTTONS AND
INDICATORS
RM-Y173
POWER
(Service Mode)
3
Item
(Data up)
5
(Device item
down)
ENTER
(Enter into
memory)
0
(Remove from
memory)
6
Item
(Data down)
DISPLAY
(Service Mode)
MUTING
(Enter into
memory)
2
(Device Item Up)
4
Disp. (Item down)
8
(Initialize)
1
Disp. (Item up)
VOLUME (+)
(Service Mode)

18
KV-21FS105
KV-21FS105
4-4. SERVICE DATA LISTS
Reg # ITEM FUNCTION RANGE
FIX
DATA NTSC PALM PALN VIDEO RF
AVERA
G
E
DATA
1 HSIZ Horizontal Size Adjustment 0-63 35 35 35 40
2 HPOS Horizontal Position Adjustment 0-63 33 33 33 25
3 VBOW Vertical Line Bowing Adj. 0-15 5 5 5 7
4 VANG Vertical line Bowing Slant Adj. 0-15 7 7 7 9
5 TRAP Horizontal Trapezoid Adj. 0-15 7 7 7 7
6 PAMP Horizontal PIN Distortion Adj. 0-63 7 7 7 12
7UPIN UpperPINDistortionAdj. 0-63 36 36 36 34
8LPIN LowerPINDistortionAdj. 0-63 36 36 36 37
9 VM Velocity Modulation On/Off 0,1 0
10 BLKO Vertical Blanking On/Off 0,1 0 0
11 VMLV Velocity Modulation Level 0-3 2
12 AGN2 Aging 2 0,1 0 0
13 REFP Reference Pulse Position 0,1 0 0
14 VBLK Vertical Blanking On/Off 0,3 0 0
15 JPSW 0,1 0 0
16 VSIZ Vertical Size Adjustment 0-63 40 47 47 26
17 VPOS Vertical Position Adj. 0-63 32 32 32 35
18 VLIN Vertical Linearity Adj. 0-15 7 5
19 SCOR Vertical "S" Correction Adjustment 0-15 6 4
20 VZOM 16:9 CRT Z Mode On/Off 0,1 0 0
21 EHT Vertical High-Voltage Correction 0-15 15 15
22 ASP Aspect Ratio Control 0-63 47 47
23 SCRL 16:9 CRT Z Mode Trans. Scroll 0-63 31 31
24 HBLK Horizontal Blanking On/Off 0,1 1 1
25 LBLK Left Blanking Adjustment 0-15 11 11
26 RBLK Right Blanking Adjustment 0-15 8 8
27 VUSN V Saw Waveform Compress 0,1 0 0
28 HDW Horizontal Drive Pulse Width 0,1 1 1
29 EWDC "Parabola" EW/ D.C. Adjustment 0.1 0 0
30 LVLN Lower Screen BTM Vertical Line Adj. 0-15 0 0
31 UVLN Upper Screen BTM Vertical Line Adj. 0-15 0 0
32 HTRAP Horizontal Trapezoid Adj. 0,1 **** 0
33 RDRV R Output Drive Control 0-63 31 21
34 GDRV G Output Drive Control 0-63 21 14
35 BDRV B Output Drive Control 0-63 21 14
36 RCUT R Output Cutoff Control 0-15 10 10
37 GCUT G Output Cutoff Control 0-15 6 7
38 BCUT B Output Cutoff Control 0-15 6 7
39 DCOL Dynamic Color On/Off 0,1 0 1
40 SHUE Sub HUE 0-31 12 14
41 SCOL Sub Color 0-31 14 14 14 14
42 SBRT Sub BRIGHTNESS 0-31 13 13
43 RON R Output On/Off 0,1 1 1
44 GON G Output On/Off 0,1 1 1
45 BON B Output On/Off 0,1 1 1
46 AXPL Axis PAL 0,1 0 0
47 AXNT Axis NTSC 0,1 0 1
48 CBPF Chroma BPF On/Off 0,1 1 1
49 CTRP Y TRAP FILTER On/Off 0,1 1 1
50 COFF Color On/Off 0,1 0 0
51 KOFF Set Color Killer 0,1 0 0
52 SSHP Sub SHARPNESS 0-15 6 5
53 SHPF SHARPNESS Circuit Fo 0,1 1
54 PREL Pre-Shoot / Over-Shoot 0,1 1 1
55 Y-DC DC Transmission Ratio Switching 0,1 1
56 GAMM Gamma Correction Amnt 0-3 1
57 ABLM ABL Mode Switching 0,1 1 1
58 VTH ABL CD VHT Switching 0,1 1 1
59 YDEL Y Delay Time Control 0-15 7 7
60 NCOL No Color ID 0,1 1 1
61 FSC FSC Out On/Off 0,1 1 1
62 K-ID Killer ID Control On/Off 0,1 0 0
63 HOSC Horizontal VCO Oscillation Freq. 0-15 12 12
Palette mode controls this register
Palette mode controls this register
Palette mode controls this register
Palette mode controls this register
Palette mode controls this register

19
KV-21FS105
KV-21FS105
Notes:
No. 1–100 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.
SERVICE ID0 25
Reg # ITEM FUNCTION RANGE
FIX
DATA NTSC PAL M PAL N VIDEO RF
AVERAGE
DATA
64 VSS Vertical Sync Slice Level 0,1 ** 0
65 HSS Horizontal Sync Slice Level 0,1 0 0
66 HMSK 0,1 0 0
67 VTMS Select Signal VTIM Pin 0-3 0 0
68 CDMD Vertical Count Down Mode Switching 0-3 3 ***
69 AFC AFC Loop Gain Switching 0-3 0 0 0 0
70 FIFR Field Frequency 0-3 * 3
71 SBAL Sub Balance 0-15 5 7
72 SBAS Sub Bass 0-7 0 9
73 STRE Sub Treble 0-7 3 9
74 BBEH BBE High 0-15 *****
75 BBEL BBE Low 0-15 5 12
76 SRND Surround 0,1 0 13
77 AUX SRS, Simulated 0-3 0
78 DISP O.S.D Display Position 0-130 15 15
79 TROT Tilt Correction 0-63 31 31 31
80 HCLW Horizontal Count Lower Limit 0-255 16 16 16
81 HCHG Horizontal Count High Limit 0-255 64 64 64
82 SYSC Color System 0-7 4 6
83 VENH Vertical Enhancement 0-7 4
84 PDSO 0,1 0
85 CK 0,1 0
86 VNL 0-15 3 3
87 HPK 0,1 0 0
88 HPKO 0,1
89 CORE 0-3 1 1
90 TRAP 0,1 1 1
91 CHTR 0,1 0 0
92 CHPF 0,1 1 1
93 ENHO 0,1 0 0
94 ID0 0-225 25 SEE ID MAP
95 ID1 0-225 3 SEE ID MAP
96 ID2 0-225 91 SEE ID MAP
97 ID3 0-225 2 SEE ID MAP
98 ID4 0-225 233 SEE ID MAP
99 ID5 0-225 17 SEE ID MAP
100 ID6 0-225 0 SEE ID MAP
Palettemodecontrolsthisregister
Palette mode controls this register
4-5. ID MAP TABLE
MODEL Destination ID-0 ID-1 ID-2 ID-3 ID-4 ID-5 ID-6
KV-21FS105 (BRAZIL) 63 3 91 2 233 9 128

20
KV-21FS105
KV-21FS105
Display Position Adjustment (DISP)
1. Input a color-bar signal.
2. Set to Service Adjustment Mode.
3. Select DISP with 1and 4.
4. Adjust values of DISP with 3and 6to adjust characters to the
center.
5. To save into memory, press MUTING then ENTER .
6. Check to see if the text is displayed on the screen.
SERVICE DISP 15
Display
Item
Mode
Item
Data
Sub Bright Adjustment (SBRT)
1. Input a monoscope signal.
2. Activate the Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Select the SBRT item with 1and 4.
5. Adjust the values of SBRT with 3and 6to obtain a faintly visible
crosshatch.
6. To save into memory, press MUTING then ENTER .
Sub Hue, Sub Color Adjustment
(SHUE, SCOL)
1. Input color-bar signal and set level to 75%.
2. Activate the Service Adjustment Mode.
3. Select the DCOL item and set the value to “0”.
4. Connect an oscilloscope probe to the C Board,
CN17152 Pin 4.
5. Select SHUE and SCOL with 1and 4.
6. While showing the SHUE item, adjust the waveform with 3and 6
until the second and third bars show the same level
(V2 = V3 ± 0.2 Vp-p).
7. While showing the SCOL item, adjust the waveform with 3and 6
until the first and fourth bars show the same level
(V1 = V4 ± 0.2 Vp-p).
NOTE: SCOL must be adjusted in all modes NTSC, PAL-M, and PAL-N.
V1 V2 V3 V4
9. Select the DCOL item and reset to “1”.
10.To save into memory, press MUTING then ENTER .
4-6. MB BOARD ADJUSTMENTS
H. Frequency (Free Run) Check
1. Input a TV mode (RF) with no signal.
2. Connect a frequency counter to base of Q501
(TP-500 H. DRIVE).
3. Check H. Frequency for 15735 ± 200 Hz, and 15650 ± 200 Hz for
PAL-N.
V. Frequency (Free Run) Check
1. Select video 1 with no signal input.
2. Set the conditions for a standard setting.
3. Connect the frequency counter to TP-508 (V OUT) or CN501 pin 6
(V DY+) and ground on the A Board .
4. Check that V. Frequency shows 60 ± 4 Hz for NTSC,
50 ± 4 Hz for PAL-N.
Drive (RDRV) Adjustment
1. Input a color-bar signal and set the level to 75%.
2. In Standard mode, set PICTURE to maximum and COLOR to
minimum.
3. Activate the Service Adjustment Mode.
4. Set both GON and BON items. Using 3and 6set each to the
following values: (Leave RON set to “1”.)
SERVICE RON
Display
Item
Mode
Item
Data
1
R ON: ON (1)
G ON: OFF (0)
B ON: OFF (0)
5. Select DCOL item and set it to “0”.
6. Connect an oscilloscope probe to C Board, J701 pin 12 (KR)
(Red Out).
7. Select RDRV with 1and 4.
8. Adjust the value of RDRV with 3and 6for 86.5 ± 2 VDC.
86.5 ± 2 VDC
9. Reset the item DCOL to “1”
10.Reset GON and BON values to “1”.
R ON: ON (1)
G ON: ON (1)
B ON: ON (1)
11.Reset PICTURE and COLOR to normal values.
12.To save into memory, press MUTING then ENTER .