SONY KV-21FS105 Service Manual

HISTORY INFORMATION FOR THE FOLLOWING MANUAL:

SERVICE MANUAL

MODEL NAME REMOTE COMMANDER DESTINATION

KV-21FS105

RM-Y173 BRAZIL

BA-5

CHASSIS

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

9-965-958-01

Self Diagnosis

Supported model

SERVICE MANUAL

MODEL NAME REMOTE COMMANDER DESTINATION

KV-21FS105

RM-Y173 BRAZIL

BA-5

CHASSIS

9-965-958-01

KV-21FS105 RM-Y173

TRINITRON® COLOR TELEVISION

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.

R562 Conﬁ rmation Method (Hold-Down Conﬁ rmation) and Readjustments .............. 15

3-2. B+ Voltage Conﬁ rmation and Adjustments....................................................................... 15

KV-21FS105

SECTION 4: CIRCUIT ADJUSTMENTS.......................................................................................... 17

4-1. Setting Service Adjustment Mode .................................................................................... 17

4-2. Memory Write Conﬁ rmation 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

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

SPECIFICATIONS

KV-21FS105

Power requirements 110-220V, 50/60Hz

Number of Inputs/Outputs

S Video

Audio Out

Speaker output (W) 5W x 2

Power Consumption (W)

In use (Max) 115W

In Standby 1W

Dimensions(W/H/D)

Video

Audio

mm 512x 475 x 493mm

1/8

x 18

Mass

kg 24.5 kg

lbs

54 lbs

11/16

x 19

7/16

1 Vp-p 75 ohms unbalanced, sync negative

Y: 1 Vp-p 75 ohms unbalanced, sync negative

C: 0.286 Vp-p (Burst signal), 75 ohms

500 mVrms (100% modulation), Impedance: 47 kilohms

)

More than 408 mVrms at the maximum volume setting (variable)

More than 408 mVrms (ﬁ x)

KV-21FS105

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

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. Purchase of this product does not convey the right to sell recordings made with the TruSurround technology.

™

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 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.

Design and speciﬁ cations are subject to change without notice.

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 identiﬁ ed 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 identiﬁ ed in this manual. Follow these procedures whenever critical components are replaced or improper operation is suspected.

KV-21FS105

SAFETY CHECK-OUT

KV-21FS105

After correcting the original service problem, perform the following safety checks before releasing the set to the customer:

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,

1. Check the area of your repair for unsoldered or poorly soldered connections. Check the entire board surface for solder splashes and

must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods.

bridges.

1. A commercial leakage tester, such as the Simpson 229 or RCA

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

2. A battery-operated AC milliampmeter. The Data Precision 245 digital

mounting hardware have been replaced. Be absolutely certain that you have replaced all the insulators.

3. Measuring the voltage drop across a resistor by means of a VOM

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.

How to Find a Good Earth Ground

A cold-water pipe is a guaranteed earth ground; the cover-plate retaining

6. Check the line cords for cracks and abrasion. Recommend the replacement of any such line cord to the customer.

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

7. Check the B+ and HV to see if they are speciﬁ ed 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.

ohmmeter. The reading should be zero ohms.

If a cold-water pipe is not accessible, connect a 60- to 100-watt troublelight (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).

WT-540A. Follow the manufacturers’ instructions to use these instructions.

multimeter is suitable for this job.

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).

0.15 µF

Figure A. Using an AC voltmeter to check AC leakage. Figure B. Checking for earth ground.

KV-21FS105

To Exposed Metal Parts on Set

kΩ

1.5

Earth Ground

AC V oltmeter (0.75 V)

AC Outlet Box

Ohmmeter

Cold-water Pipe

KV-21FS105

SELF-DIAGNOSTIC FUNCTION

Self Diagnosis

Supported model

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to ﬂ ash. The number of times the LED ﬂ ashes translates to a probable source of the problem. A deﬁ nition of the STANDBY/TIMER LED ﬂ ash 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 ﬂ ash 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 ﬁ rst 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

Power does not turn on Does not light

+B overcurrent (OCP)* times 2:0 or 2:1 • H.OUT (Q502) is shorted. (A Board)

Vertical deflection stopped* times 4:0 or 4:1 • +12V is not supplied. (A Board)

White balance failure (not balanced)

No. of Times

STANDBY/TIMER

LED Flashes

5 times :0 or 5:1 • Video OUT (IC502) is faulty. (A Board)

Self-Diagnostic Display/

Diagnostic Result

Probable Cause

Location

• Power cord is not plugged in.

• Fuse is burned out. (F601) (A Board)

• IC702 is shorted. (CB Board)

• IC502 is faulty. (A Board)

• IC1301 is faulty. (MB Board)

• Screen (G2) is improperly adjusted.**

Detected Symptom s

• Power does not come on.

• No power is supplied to the TV.

• AC power supply is faulty.

• Power does not com e on.

• Load on power line is shorted.

• Has entered standby state after horizontal raster.

• Vertical deflection pulse is stopped.

• Power line is shorted or power supply is stopped.

• No raster is generated.

• CRT c athode curren t detection reference pulse output is small.

* If a +B overcurrent is detected stoppage of the vertical deﬂ ection is detected simultaneously.

The symptom that is diagnosed ﬁ rst by the microcontroller is displayed on the screen.

** Refer to Screen (G2) Adjustments in Section 2-4. of this manual.

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.

Standby/Timer LED

Diagnostic Item Flash Count*

+B Overcurrent 2 times V-STOP 4 times White Balance Failure 5 times

*One ﬂ ash 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 ﬂ ashing.

Self-Diagnostic Screen Display

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be conﬁ rmed, it is possible to bring up past occurrences of failure on the screen for conﬁ rmation.

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

Sound volume

SELF DIAGNOSIS 2: 0

3: NA 0

4: 0

5: NA 1

101: WDT 0

Numeral “0” means that no fault was detected.

Numeral “1” means a fault was detected one time only.

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:

Power ON.

ENTERChannel

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

FROM

CRT

A BOARD

FROM

IC502 PIN 7

MB BOARD

IC1301

Y/CHROMA JUNGLE

IK IN

HP/PROTECT

SDA

A BOARD

IC507

V. OUT

REF

MB BOARD

IC1001

SYSTEM

I-PROT

IO-SDAT

IO-BDAT

O-LED

DISPLAY

MB BOARD

IC1003

MEMORY

B-DAT

+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 deﬂ ection 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).

KV-21FS105

SECTION 1: DISASSEMBLY

KV-21FS105

1-1. REAR COVER REMOVAL

Screw +BVTP 4x16

1-2. CHASSIS ASSEMBLY REMOVAL

Screw +BVTP 4x16

Rear Cover

Screw +BVTP 4x16

CB Board

MB Board

Claw

A Board

CB Board

MB Board

1-3. SERVICE POSITION

Extension Cable for Service p/n S-1294-965-A

A Board

KV-21FS105

1-4. 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.

1. Discharge the anode of the CRT and remove the anode cap.

2. Unplug all interconnecting leads from the deﬂ ection 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 ﬁ xing screw and remove.

6. Loosen the deﬂ ection yoke ﬁ xing 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 ﬁ xing screws [located on each CRT corner] and remove the CRT [Take care not to handle the CRT by the neck].

KV-21FS105

Coated

Earth

Ground

Strap

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

Turn up one side of the rubber cap in the direction indicated by arrow a .

Use your thumb to pull the rubber cap ﬁ rmly in the direction indicated by arrow b .

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 ﬁ tting 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.

Anode Button

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 .

KV-21FS105

SECTION 2: SET-UP ADJUSTMENTS

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

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 deﬂ ection 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

Test Equipment Required:

1. Color Bar Pattern Generator

2. Degausser

3. DC Power Supply

4. Digital Multimeter

Purity Control

3. Turn the raster signal of the pattern generator to green.

4. Move the deﬂ ection 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 deﬂ ection yoke forward, and adjust so that the entire screen becomes green.

6. Switch over the raster signal to red and blue and conﬁ rm the condition.

7. When the position of the deﬂ ection yoke is determined, tighten it with the deﬂ ection yoke mounting screw.

8. When landing at the corner is not right, adjust by using the disk magnets.

Purity control

corrects this area

Disk magnets or rotatable disk magnets correct

these areas (a-d)

Deflection yoke positioning

corrects these areas

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).

Center dot

RV701 V.STAT

R G B

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 insufﬁ cient H.Static convergence.

2. Rotate BMC magnet (b) to correct insufﬁ cient V.Static convergence.

3. After adjusting the BMC magnet, repeat Beam Landing.

V- S TAT

BMC MAGNET

PURITY

V.STAT magnet

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:

RG B

BG R

BMC magnet

KV-21FS105

Dynamic Convergence Adjustment

Before performing this adjustment, perform Horizontal and Vertical Static Convergence Adjustments.

Preparation:

1. Slightly loosen deﬂ ection yoke screw.

2. Remove deﬂ ection yoke spacers.

3. Move the deﬂ ection yoke for best convergence as shown:

BGR

B G R

RGB

BGR RGB

R G

RGB

BGR

4 Tighten the deﬂ ection yoke screw.

5. Install the deﬂ ection yoke spacers.

Screen-Corner Convergence

1. Afﬁ x a permalloy assembly corresponding to the misconverged areas.

a-d: screen-corner

misconvergence

2-3. FOCUS

1. Adjust FOCUS control for best picture.

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 deﬂ ection yoke.

R B

B R (R)(B)

4. Adjust XCV core to balance X axis.

5. Adjust YCH VR to balance Y axis.

(B)(R)

TLH+ TLH-

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.

170Vdc

170 + 4.0 Vdc

GND

4. Observe the screen and adjust SCREEN (G2) VR in FBT to obtain the faintly visible background of dot signal.

pedestal

KV-21FS105

2-5. METHOD OF SETTING THE SERVICE

ADJUSTMENT MODE

Service Mode Procedure

1. Standby mode (power off).

DISPLAY

2. Remote Commander (Press each button within one second.)

Channel

Sound Volume

Power on the

Service Adjustment Mode In

1. The CRT displays the item being adjusted.

Item Data

ENTER

Mode

SERVICE HSIZ

2. Press

3. Press

4. To save into memory, press

or 4 on the Remote Commander to select the item.

on the Remote Commander to change the data.

Display

MUTING

Item

then

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

7. Adjust by pressing

8. Set the PICTURE and BRIGHTNESS to maximum.

9. Select GDRV and BDRV with 1 and 4 .

10. Adjust by pressing

11. Reset DCOL to “1”.

12. To save into memory, press

and

and 4 .

for the best white balance.

MUTING

then

ENTER

Service Adjustment Mode Memory

To exit service adjustment mode, turn the set off then on.

SERVICE

WRITE

MUTING

ENTER

KV-21FS105

SECTION 3: SAFETY RELATED ADJUSTMENTS

KV-21FS105

3-1. X R562 CONFIRMATION METHOD

(HOLD-DOWN CONFIRMATION) AND READJUSTMENTS

Always perform the following adjustments when replacing the following components marked with a

Part Replaced ( ) Adjustment ( )

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

mark on the schematic diagram:

HV HOLD-DOWN (R562)

Hold-Down Readjustment

If the setting indicated in Step 2 of Hold-Down Operation Conﬁ rmation cannot be met, readjustment should be performed by altering the resistance value of the R562 component marked with

3-2. B+ VOLTAGE CONFIRMATION AND

Preparation Before Conﬁ rmation

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. Conﬁ rm that the voltage of more than 97 VDC appears between C546(+) or TP503 and ground on the A Board.

Hold-Down Operation Conﬁ rmation

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. Conﬁ rm 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.

Always perform the following adjustments when replacing the components which are marked with

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. Conﬁ rm the voltage on A Board between TP-600 and ground is less

5. If step 4 is not satisﬁ ed, replace the components on A Board listed

T505

ammeter

3.0 mA DC range

ABL

IABL

ADJUSTMENTS

on the schematic diagram on the A Board:

than 136 VDC.

above, and then repeat the steps 1-4.

FBT

KV-21FS105

+ 34 hidden pages

SONY KV-21FS105 Service Manual

TABLE OF CONTENTS

SPECIFICATIONS

WARNINGS AND CAUTIONS

SAFETY CHECK-OUT

SELF-DIAGNOSTIC FUNCTION

SECTION 1: DISASSEMBLY

1-1. REAR COVER REMOVAL

1-2. CHASSIS ASSEMBLY REMOVAL

1-3. SERVICE POSITION

1-4. PICTURE TUBE REMOVAL

ANODE CAP REMOVAL PROCEDURE

SECTION 2: SET-UP ADJUSTMENTS

2-1. BEAM LANDING

2-2. CONVERGENCE

2-3. FOCUS

2-4. SCREEN (G2)

2-6. WHITE BALANCE ADJUSTMENTS

SECTION 3: SAFETY RELATED ADJUSTMENTS