JVC AV-27F476/R, AV-27F476/S, AV-32F476/Y, AV-32F476/Z Service Manual

SERVICE MANUAL
COLOR TELEVISION
YA24320052
AV-27F476/R, AV-27F476/S, AV-32F476
BASIC CHASSIS
GJ5
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA243
2005/2
SPECIFICATION
Items
Dimensions (W × H × D) 82.9 cm × 59.3 cm × 51.9 cm
(32-3/4" × 23-3/8" × 20-1/2")
Mass 43.0 kg (94.6 Ibs) 64.0 kg (140.8 Ibs)
TV RF System CCIR (M)
Color System NTSC
Sound System BTSC (Multi Channel Sound)
Teletext System Closed Caption (T1 - T4 / CC1 - CC4)
TV Receiving Channels and Frequency
TV / CATV Total Channel 181 Channels
Intermediate Frequency Video IF
Color Sub Carrier 3.58 MHz
Power Input AC120 V, 60 Hz
Power Consumption 140 W 160 W
Picture Tube (Visible size) 68 cm (29") Measured diagonally
High Voltage 30.0 kV ±1.3 kV [at Zero beam current] 31.4 kV ±1.3 kV [at Zero beam current]
Speaker 6.5 cm × 13 cm (2-1/2" × 5"), Oval type × 2
Audio Power Output 9 W + 9 W
Antenna Terminal (VHF / UHF) F-type connector, 75 unbalanced
Video / Audio input [Input-1/2/3]
Audio Output (Fix) 500 mV(rms)(-4dBs), low Impedance, (400 kHz when modulated 100 %), RCA pin jack × 2 Remote Control Unit RM-C1258G (AA/R6/UM-3 battery × 2)
Component Video
VHF low
VHF high
UHF
CATV
Sound IF
[Input-2]
S-video
[Input-1]
Video Audio
02ch - 06ch: 54 MHz - 88 MHz 07ch - 13ch: 174 MHz - 216 MHz 14ch - 69ch: 470 MHz - 806 MHz 54MHz - 804 MHz Low Band: 02 - 06 High Band: 07 - 13 Mid Band: 14 - 22 Super Band: 23 - 36 Hyper Band: 37 - 64 Ultra Band: 65 - 94, 100 - 135 Sub Mid Band: 01, 96 - 99
[Reception of channel A-5 ("95" of the TV set’s on-screen CABLE channel) is recommended for your TV set.]
45.75 MHz
41.25 MHz (4.5 MHz)
(H: 55.4 cm × V: 41.8 cm)
RCA pin jack × 3 Y : 1V(p-p), 75 , negative sync Pb/Pr : 0.7 V(p-p), 75 Mini DIN 4-pin connector × 1 Y : 1 V(p-p), 75 , negative sync C : 0.286 V(p-p)(burst signal), 75 1 V(p-p), 75 , negative sync, RCA pin jack × 2 500 mV(rms)(-4dBs), high impedance, RCA pin jack × 6
AV-27F476 AV-32F476
Contents
93.9 cm × 68.5 cm × 57cm (37" × 27" × 22-1/2")
80 cm (34") Measured diagonally
(H: 65.6 cm × V : 49.6 cm)
Design & specifications are subject to change without notice.
1-2 (No.YA243)
SECTION 1
PRECAUTION

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware, many
circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should not be
made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have special
safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components having such features are
identified by shading on the schematics and by ( ) on the parts list in Service manual. The use of a substitute replacement
which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards.
(4) Use isolation transformer when hot chassis.
The chassis and any sub-chassis contained in some products are connected to one side of the AC power line. An isolation transformer of adequate capacity should be inserted between the product and the AC power supply point while performing any service on some products when the HOT chassis is exposed.
(5) Don't short between the LIVE side ground and ISOLATED (NEU-
TRAL) side ground or EARTH side ground when repairing. Some model's power circuit is partly different in the GND. The differ­ence of the GND is shown by the LIVE : ( ) side GND, the ISOLAT­ED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken.
(6) If any repair has been made to the chassis, it is recommended that
the B1 setting should be checked or adjusted (See B1 POWER SUPPLY check).
(7) The high voltage applied to the picture tube must conform with that
specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.
(8) Do not check high voltage by drawing an arc. Use a high voltage
meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10k
(9) When service is required, observe the original lead dress. Extra
precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.
2W resistor to the anode button.
(10) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 1100V AC (r.m.s.) for a period of one second.
(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rat-
ed up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use an AC voltmeter having 1000 following manner. Connect a 1500 a 0.15
µF AC-type capacitor between an exposed metal part
per volt or more sensitivity in the
10W resistor paralleled by
and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER (HAVING 1000 /V, OR MORE SENSITIVITY)
0.15 F AC-TYPE
PLACE THIS PROBE
1500 10W
(11) High voltage hold down circuit check.
GOOD EARTH GROUND
ON EACH EXPOSED ME TAL PAR T
After repair of the high voltage hold down circuit, this circuit shall be checked to operate correctly.See item "How to check the high voltage hold down circuit".
This mark shows a fast operating fuse, the letters indicated below show the rating.
A V
POWER CORD REPLACEMENT WARNING.
Connecting the white line side of power cord to "WHT" character side.
PWB
White line side
WHT
PW
(No.YA243)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

SMART CAPTION
Smart caption will appear when you press the MUTING button, only on channels where the broadcast contains CLOSED CAPTION information.
SMART SOUND
Decreases high sound levels, giving a regulated sound level.
FLAT SQUARE CRT
It became legible from any position by CRT with few reflection and reflect lumps on the flat screen.
DIGITAL COMB FILTER
By the 3 line digital comb filter, the refreshed image can be seen.
VIDEO STATUS
Expression of a favorite screen can be chosen by the VIDEO STATUS function.
COMPONENT INPUT
Since the component signal input terminal is equipped, it reappears direct without deteriorating the signal from DVD.
V-CHIP
Since the V-CHIP is built in, it can choose, view and listen to a healthy program.
MTS STEREO
The voice multiplex function of the MTS system is built in. (MTS = Multi channel Television Sound system)
RETURN PLUS
You program a specific channel to return to while scanning through the channels using the CH+ and CH - keys.
VIDEO INPUT LABEL
This function is used to label video input connections for the onscreen displays.
WORLD CLOCK
The world clock feature provides time differences for some of the major cities around the world in real time.
BBE
High definition audio adds natural, clear and extraordinary sound quality to any program.
HYPER SURROUND
Creates a deep, three-dimensional sound effect by channeling the audio through the TV's front-firing speakers.

2.2 MAIN DIFFERENCE LIST

Item AV-27F476/R AV-27F476/S AV-32F476/Y AV-32F476/Z
PICTURE TUBE (ITC) A68ELH021X201 A68QCP693X003 A80AKS90X03 A80ERF182X17
MAIN PWB SGJ-1580A-M2 SGJ-1579A-M2 SGJ-1572A-M2 SGJ-1575A-M2
CRT SOCKET PWB SGJ-3523A-M2 SGJ-3521A-M2 SGJ-3522A-M2

2.3 HOW TO IDENTIFY MODELS

How to recognize from the appearance of the model concerned is written below. Please distinguish from several contents currently printed on the rating label
MODEL NAME
AV-27F476
AC 120V 60Hz
MODEL NO.
TV SCREEN SIZE : DIAGONAL
CHASSIS NO. MANUFACTURED SERIAL NO.
W
INCHES
ME
VIDEO EQUIPMENT
4C43
AV-32F476
DISTINGUISH NAME
RA
SA
YA
ZA
1-4 (No.YA243)

2.4 TECHNICAL INFORMATION

2.4.1 MAIN MI-COM (CPU) PIN FUNCTION
Pin
Pin name I/O Function
No.
1 MTS_ADJ I Not used 29 YC_GND - GND
2 AFT1 I AFT voltage for tuner (Tuning frequency control) 30 V1_IN I Not used
3 KEY I Key scan for front control [No signal: H] 31 ABCL I Current for automatic beam (brightness)/contrast limit
4 uP_DVss - GND 32
5 Reset I CPU reset [Reset: L] 33 BLACK_DET - Black level detection filter
6 8MHz_OUT O CPU system clock: 8MHz oscillation 34 SVM_OUT O Y signal for scan velocity scan modulation
7 8MHz_IN I CPU system clock: 8MHz oscillation 35 APL_FIL - Average picture level filter
8 TEST - GND 36 APC_FIL - Automatic phase control filter
9 uP_DVD D I 5V 37 fsc_OUT O Color sub carrier (3.58MHz) for 3-line digital comb filter [IC5201]
10 AGC_MUTE O AGC muting for tuner (when channel select) [Muting : H] 38 YC_Vcc I 5V (for video process circuit)
11 uP_VVSS - GND 39 R_OUT O R signal for CRT output
12 TV_HGND - GND 40 G_OUT O G signal for CRT output
13 FBP_SCP I Flyback pulse (H. pulse) 41 B_OUT O B signal for CRT output
14 HOUT O H. drive (oscillation) 42 RGB_Vcc I 9V (for RGB process circuit)
15 H_Vcc I 9V (for H. oscillation start) 43 IK_IN I Not used
16 HAFC_1 - H. AFC filter 44 TV_DGND - GND
17 Vsaw - V. saw filter 45 uP_AGND - GND
18 VOUT O V. drive 46 uP_AVdd - 5V
19 EW_OUT O Parabola waveform (for sidepin correection) 47 MAIN_POWER O Power on/off switching control [Powen on: L]
20 X-RAY I X-ray detection (for protection) [Detection : H] 48 PANORAMA I Not used: Aspect size control [PANORAMA: L]
21 Ys I Not used 49 SDA0 I/O Data for Inter IC control bus (for various devices)
22 Cb_IN I Cb (external) signal 50 SCL0 O Clock for Inter IC control bus (for various devices)
23 Y_IN I Y (external) signal 51 SDA1 I/O Data for Inter IC control bus (for main memory)
24 Cr_IN I Cr (external) signal 52 A_MUTING O Audio muting [Muting : H]
25 TV_DVcc I 3.3V 53 SCL1 O Clock for Inter IC control bus (for main memory)
26 V3IN/CIN I Chroma signal (for YC separation output) 54 LED O POWER / ON TIMER LED lndication [lighting : L]
27 EHT_IN I Not used 55 REMOCON I Remote control sensor input [No input : H]
28 V2_IN/Y_IN I Y signal (for YC separation output) 56 ASP_ABL I Not used
Pin
Pin name I/O Function
No.
MONITOR_OUT
O Not used
(No.YA243)1-5
SECTION 3
DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER
(1) Disconnect the power plug. (2) Remove the 11 screws [A]. (3) Withdraw the REAR COVER backward.
3.1.2 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER. (1) Remove the 4 screws [B]. (2) Withdraw the AV TERMINAL BOARD toward you.
3.1.3 REMOVING THE CHASSIS
• Remove the REAR COVER.
• Remove the AV TERMINAL BOARD. (1) Slightly raise the both sides of CHASSIS by hand. (2) Remove the 2 claws under the both side of the CHASSIS
from the front cabinet.
(3) Withdraw the CHASSIS backward.
(If necessary, remove the wire clamp, connectors etc.)
3.1.7 CHECKING THE CHASSIS
To check the PW Board from back side.
(1) Pull out the CHASSIS (refer to REMOVING THE CHASSIS). (2) Erect the CHASSIS vertically with the HVT side facing up
so that you can easily check the back side of the PW board.
CAUTION :
• When erecting the CHASSIS, be careful so that there will be no contacting with other PW Board.
• Before turning on power, make sure that the wire connector is properly connected.
When conducting a check with power supplied, be sure
to confirm that the CRT EARTH WIRE (BRAIDED ASS'Y) is connected to the CRT SOCKET PWB.
3.1.8 WIRE CLAMPING AND CABLE TYING
(1) Be sure to clamp the wire. (2) Never remove the cable tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires with a new cable tie.
3.1.4 REMOVING THE SPEAKER
• Remove the REAR COVER. (1) Remove the 2 screws [C], then remove the SPEAKER with
SPEAKER HOLDER.
(2) Remove the 2 screws [D], then remove the SPEAKER
from the SPEAKER HOLDER.
(3) Follow the same steps when removing the other hand
SPEAKER.
NOTE :
When remove the 2 screws [C] of the SPEAKER, remove the lower side screw first, and then remove the upper one.
3.1.5 REMOVING THE LED & POWER SW PWB
• Remove the REAR COVER. (1) Remove the 2 screws [E]. (2) Withdraw the LED & POWER SW PWB toward you.
*If necessary, remove the wire clamp, connector etc.
3.1.6 REMOVING THE FRONT CONTROL PWB
• Remove the REAR COVER. (1) Remove the 2 screws [F]. (2) Withdraw the FRONT CONTROL PWB toward you.
*If necessary, remove the wire clamp, connector etc.
1-6 (No.YA243)
FRONT CABINET
LED & POWER SW PWB
D
C
SPEAKER
CRT SOCKET PWB
SPEAKER HOLDER
FRONT CONTROL PWB
MAIN PWB
Claw
F
E
REAR COVER
Claw
AV SELECTOR PWB
POWER CORD
AV TERMINAL BOARD
B
Fig.1
A
(No.YA243)1-7
3.1.9 REMOVING THE CRT
NOTE:
• Replacement of the CRT should be performed by 2 or more
persons.
• After removing the REAR COVER, CHASSIS etc., (1) Putting the CRT change table on soft cloth, the CRT
change table should also be covered with such soft cloth (shown in Fig. 2).
(2) While keeping the surface of CRT down, mount the TV set
on the CRT change table balanced will as shown in Fig. 2.
(3) Remove 4 screws marked by arrows with a box type screw-
driver as shown in Fig. 3.
NOTE:
Since the cabinet will drop when screws have been removed, be sure to support the cabinet with hands.
(4) After 4 screws have been removed, put the cabinet slowly
on cloth (At this time, be carefully so as not to damage the front surface of the cabinet) shown in Fig. 4.
NOTE:
• The CRT should be assembled according to the opposite sequence of its dismounting steps.
• The CRT change table should preferably be smaller that the CRT surface, and its height be about 35cm.
CRT CHANGE TABLE
CLOTH
CRT CHANGE TABLE
Fig.2
CRT
Fig.3
APPROX. 35cm
BOX TYPE SCREW DRIVER
CRT
CABINET
CRT CHANGE TABLE
Fig.4
COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.
Subsequent to replacement of the CRT and HV transformer or repair of the anode cap, etc. by dismounting them, be sure to coat silicon grease for electrical insulation as shown in Fig.5.Wipe around the anode button with clean and dry cloth. (Fig.5)Coat silicon grease on the section around the anode button. At this time, take care so that any silicon greases dose not sticks to the anode button. (Fig.6)
Silicon grease product No. KS - 650N
CRT
Anode button
Approx. 20mm (Do not coat grease on this section
Silicon grease should be coated by 5mm or more from the outside diameter of anode cap.
1-8 (No.YA243)
Silicon grease
coating
Fig.5
Anode button (No sticking of silicon grease)
Fig.6
Coating position of silicon grease
Anode cap

3.2 MEMORY IC REPLACEMENT

• This model uses the memory IC.
• This memory IC stores data for proper operation of the video and drive circuits.
• When replacing, be sure to use an IC containing this (initial value) data.
3.2.1 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug.
2. Replace the memory IC
Be sure to use a memory IC written with the initial setting data.
3. Power on
Connect the power cord to the wall outlet and switch on the power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the receive channels (Channels Preset) as described.
5. User settings
Check the user setting items according to the "FACTORY SETTING ITEM" table. Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is necessary(Fig.1) . Refer to the SERVICE ADJUSTMENT for setting.
3.2.2 SERVICE MODE SETTING ITEMS
SERV ICE MENU
1.
V/C(S)
3.
SOUND(A)
5.
3L Y/C(LYC)
7.
LOW LIGHT
9.
VCO
11.
I2C BUS
SELECT BY OPERATE BY
2.
DEF(D)
4.
OTHERS(F)
8.
HIGH LIGHT
12.
SYSTEM(SYS)
EXIT BY
Fig.1
Setting items Settings Item No.
1. V/C(S)
(Video setting)
2. DEF(D)
(Deflection setting)
3. SOUND(A) (Audio setting)
4. OTHERS [Do not adjust] (Factory setting)
5. 3L Y/C(LYC) [Do not adjust] (Y/C separate setting)
7. LOW LIGHT
(White balance setting)
8. HIGH LIGHT (White balance setting)
9. VCO
(VCO setting)
11. I2C BUS [Do not adjust]
2
C BUS setting)
(I
12.SYSTEM (SYS)
(System constant setting)
Adjust S01~S48
Adjust D01~D33
Adjust A01~A08
Fixed F01~F18
Fixed LYC01~LYC12
Adjust ---
Adjust ---
Adjust ---
Fixed ---
Fixed SYS01~SYS26
EXIT
(No.YA243)1-9
3.2.3 SETTINGS OF FACTORY SHIPMENT
3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION
Setting item Setting position
POWER Off
CHANNEL CH-02
VOLUME 10
3.2.3.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE ADJUST
Setting item Setting position
TINT 0
COLOR 0
PICTURE +8
BRIGHT 0
DETAIL +8
COLOR TEMPERATURE HIGH
NOISE MUTING ON
VSM ON
(2) SOUND ADJUST
Setting item Setting position
BASS 0
TREBLE 0
BALANCE 0
MTS STEREO
SMART SOUND OFF
INPUT TV
CHANNEL CH-02
VOLUME 10
MUTING OFF
DISPLAY OFF
SLEEP TIMER OFF
THEATER PRO OFF
VIDEO STATUS DYNAMIC
ASPECT 4 : 3
SOUND
(3) CLOCK / TIMERS
SET CLOCK OFF
ON / OFF TIMER OFF
(4) INITIAL SETUP
LANGUAGE ENG.
CLOSED CAPTION OFF(CC1/T1)
FRONT PANEL LOCK OFF
AUTO SHUT OFF OFF
XDS ID ON
V-CHIP OFF
Setting item Setting position
HYPER SURROND OFF
BBE ON
Setting item Setting position
Setting item Setting position
1-10 (No.YA243)

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 CAUTIONS
(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it.
3.3.2 SOLDERING IRON
(1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts.
3.3.3 REPLACEMENT STEPS
1. How to remove Chip parts
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
SOLDER
SOLDER
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder. Then heat and melt the solder at both ends of the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead A as indicated in the figure.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove the chip part.
NOTE :
After removing the part, remove remaining solder from the pattern.
A
B
C
(4) Then solder leads B and C.
A
B
C
(No.YA243)1-11
SECTION 4
ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the
REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.
(2) The adjustment using the REMOTE CONTROL UNIT is
made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
(3) Make sure that connection is correctly made AC to AC
power source.
(4) Turn on the power of the TV and measuring instruments for
warming up for at least 30 minutes before starting adjustments.
(5) If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors,
transformers and condensers) not shown in the adjustment items of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENTS

Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.
Item Preset value
VIDEO STATUS STANDARD
PICTURE adjustment All 00
COLOR TEMPERATURE LOW
VSM OFF
SOUND adjustment All 00
BBE OFF
HYPER SORROUND OFF
ASPECT 4 : 3

4.3 MEASURING INSTRUMENT AND FIXTURES

• DC voltmeter (or digital voltmeter)
• Oscilloscope
• Signal generator (Pattern generator) [NTSC]
• TV audio multiplex signal generator
• Remote control unit

4.4 ADJUSTMENT ITEMS

CHECK ITEM
• B1 VOLTAGE check
• HIGH VOLTAGE HOLD DOWN check
FOCUS
• FOCUS adjustment
DEFLECTION CIRCUIT
• V. SIZE / V. POSITION (4:3) adjustment
• V. SIZE / V. POSITION (16:9) adjustment
• H. POSITION / H. SIZE / SIDE PIN (4:3) / (16:9) adjustment
VIDEO CIRCUIT
• WHITE BALANCE(High Light & Low Light) adjustment
• SUB BRIGHT adjustment
• SUB CONTRAST adjustment
MTS CIRCUIT
• MTS INPUT LEVEL adjustment
• MTS SEPARATION adjustment
1-12 (No.YA243)

4.5 ADJUSTMENT LOCATIONS

HVT
V C ENT ER SW
FRONT
FRONT
LED & POWER SW PWB
POWER LED
POWER SW
SPEAKER
CN5006
B
SS
MEMORY IC
IC702
CN007
IC201
FRONT CONTROL PWB
B
CN004
CN6007
PW
POWER CORD
F901
5A
CN6006
FRONT
MAIN PWB
DEG
DEG COIL
CN001
AV SELECTOR PWB
CRT SOCKET PWB
TOP
CN3004
TP-E
TP-R
(SOLDER SIDE)
TP-B
CN3005
TUNER
V CENTER SW
S421
DOWN
UP
5
1 : TP-E 2 : X-RAY2 3 : X-RAY1 4 : NC 5 : TP-91
DEF. YOKE
HV
HVT
E1
S1
CN005
1
( )
CRT EARTH
(BRAIDED ASS'Y)
UPPER : FOCUS
: SCREEN
LOWER
(No.YA243)1-13

4.6 BASIC OPERATION OF SERVICE MODE

MAIN MENU
SERVICE MENU
1.V/C(S) 2.DEF(D)
3.SOUND(A) 4.OTHERS(F)
5.3L Y/C(LYC)
7.LOW LIGHT 8.HIGH LIGHT
9.VCO
11.I2C BUS 12.SYSTEM(SYS)
SELECT BY OPERATE BY EXIT BY
RF 4 : 3 STD LOW
S01 BRIGHT
RF 4 : 3 STD LOW
D01 V FREQ
EXIT
1.V/C(S)
2.DEF(D)
SUB MENU
7.LOW LIGHT
BRIGHT
8.HIGH LIGHT
9.VCO [Fixed value]
TOO HIGH GOOD TOO LOW
SYNC: YES AFC ON FINE 0
3.SOUND(A)
A01 IN LEVEL
4.OTHERS(F) [Fixed value]
F01
5.3L Y/C(LYC) [Fixed value]
LYC01
11.I2C BUS [Fixed value]
I2C BUS ON
12.SYSTEM(SYS) [Fixed value]
SYS01 VIDEO IN
1-14 (No.YA243)
4.6.1 TOOL OF SERVICE MODE OPERATION
Operate the SERVICE MODE with the REMOTE CONTROL UNIT.
4.6.2 SERVICE MODE ITEMS
In general, basic setting (adjustments) items or verifications are performed in the SERVICE MODE.
1. V/C (S) This sets the setting values of the VIDEO circuit.
2. DEF (D) This sets the setting values of the DEFLECTION circuit.
3. SOUND (A) This sets the setting values of the AUDIO circuit.
4. OTHERS (F) This sets the setting values of the factory settings. [Do not adjust]
6. 3L Y/C(LYC) This sets the setting values of the 3 line YC separation control circuit. [Do not adjust]
7. LOW LIGHT This sets the setting values of the WHITE BALANCE (LOW LIGHT) control circuit.
8. HIGH LIGHT This sets the setting values of the WHITE BALANCE (HIGH LIGHT) control circuit.
9. VCO This sets the setting values of the VCO control circuit. [Do not adjust]
2
11. I2C BUS This sets the setting values of the I
C BUS control circuit. [Do not adjust]
12. SYSTEM(SYS) This sets the setting values of the system control circuit. [Do not adjust]
4.6.3 HOW TO ENTER THE SERVICE MODE
(1) Set to 0 minutes using the [SLEEP TIMER] key. (2) Press the [VIDEO STATUS] key and [DISPLAY] key
SERVICE MODE SELECT KEY
simultaneously while “0 MIN” is displayed, then enter the SERVICE MODE.
NOTE:
TV/CATV switch
Before entering the SERVICE MODE, confirm that the setting of TV / CATV switch of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR / DVD switch is at the "VCR"
DISPLAY
side. If the switches have not been properly set, you cannot enter the SERVICE MODE.
SLEEP TIMER
VCR/DVD switch
POWER
NUMBER
4.6.4 HOW TO STORE OF SETTING VALUE
The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys
4.6.5 HOW TO EXIT THE SERVICE MODE Press the [EXIT] key to exit the SERVICE MODE.
VIDEO STATUS
VOL-
MENU
ASPECT
RM-C1258G
CH+
VOL+
EXIT
CH-
(No.YA243)1-15
4.6.6 SERVICE MODE SETTING
A
1. V/C, 2. DEF
• Press [CH+] / [CH-] key For scrolling up/down the adjustment item.
• Press [VOL+] / [VOL-] key For scrolling up/down the data values.
NOTE:
The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.
INPUT SIGNAL
RF 4 : 3 STD LOW
SPECT
COLOR TEMPERATURE
VIDEO STATUS
7. LOW LIGHT
The settings for WHITE BALANCE(LOW LIGHT) control circuit.
NOTE:
The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.
SETTING VALUESETTING ITEM
BRIGHT
SETTING ITEM
SETTING NO.
SETTING VALUE
(1) INPUT SIGNAL
RF : Antenna input COMP : External (Component) input EXT : External (S / Composite) input
(2) ASPECT
4 : 3 : 4 : 3 screen mode 16 : 9 : 16 : 9 screen mode
(3) VIDEO STATUS
STD : STANDARD THEA : THEATER
(4) COLOR TEMPERATURE
HIGH : White balance high mode LOW : White balance low mode
3. SOUND (A)
• Press [CH+] / [CH-] key For scrolling up/down the adjustment item.
• Press [VOL+] / [VOL-] key For scrolling up/down the data values.
NOTE:
The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.
R CUTOFF
G CUTOFF B CUTOFF
SETTING VALUE
8. HIGH LIGHT
The settings for WHITE BALANCE(HIGH LIGHT) control circuit.
NOTE:
The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.
SETTING VALUE
B DRIVER DRIVE
1-16 (No.YA243)
A01 IN LEVEL
SETTING ITEM
SETTING NO.
SETTING VALUE

4.7 INITIAL SETTING VALUE OF SERVICE MODE

(1) Adjustment of the SERVICE MODE is made on the basis of the initial setting values ; however, the new setting values which set
the screen in its optimum condition may differ from the initial setting. (2) Do not change the initial setting values of the setting items NOT LISTED IN ADJUSTMENT PROCEDURE. (3) --- : This mark described in each table shows "Cannot adjust it."
4.7.1 [1.V/C(S)]
Initial setting value
AV-27F476/R
No.
S01 BRIGHT 0 - 127 64 --- --- --- ---
S02 PICTURE 0 - 127 55 --- --- --- ---
S03 COLOR 0 - 127 48 --- --- --- 48
S04 TINT 0 - 127 50 --- --- --- 72
S05 DETAIL 0 - 63 35 --- --- 40 40
S06 BRIGHT+- -32 - +32 --- ±0 +1 +4 -4
S07 PICT+- -32 - +32 --- -8 -7 +3 +3
S08 COLOR+- -32 - +32 --- ±0 -3 -3 ---
S09 TINT+- -32 - +32 --- ±0 -3 +14 ---
S10 DETAIL+- -32 - +32 --- --- ±0 --- ---
Setting
item
Variable
range
RF
STANDARD THEATER STANDARD STANDARD
4 : 3 16 : 9 4 : 3 4 : 3 4 : 3
AV-27F476/S
EXTERNAL
S / COMPOSITE
(
EXTERNAL
)
(COMPONENT)
Initial setting value
AV-32F476/Y
No.
S01 BRIGHT 0 - 127 64 --- --- --- ---
S02 PICTURE 0 - 127 55 --- --- --- ---
S03 COLOR 0 - 127 45 --- --- --- 43
S04 TINT 0 - 127 58 --- --- --- 70
S05 DETAIL 0 - 63 35 --- --- 40 40
S06 BRIGHT+- -32 - +32 --- ±0 +3 -2 -2
S07 PICT+- -32 - +32 --- -8 -7 +2 +2
S08 COLOR+- -32 - +32 --- ±0 -3 ±0 ---
S09 TINT+- -32 - +32 --- ±0 -3 +6 ---
S10 DETAIL+- -32 - +32 --- --- ±0 --- ---
Setting
item
Variable
range
RF
STANDARD THEATER STANDARD STANDARD
4 : 3 16 : 9 4 : 3 4 : 3 4 : 3
EXTERNAL
S / COMPOSITE
(
EXTERNAL
)
(COMPONENT)
(No.YA243)1-17
Initial setting value
AV-32F476/Z
No.
S01 BRIGHT 0 - 127 64 --- --- --- ---
S02 PICTURE 0 - 127 50 --- --- --- ---
S03 COLOR 0 - 127 45 --- --- --- 45
S04 TINT 0 - 127 56 --- --- --- 70
S05 DETAIL 0 - 63 35 --- --- 40 40
S06 BRIGHT+- -32 - +32 --- ±0 +3 -2 -3
S07 PICT+- -32 - +32 --- -8 -7 +2 ±0
S08 COLOR+- -32 - +32 --- ±0 -3 -1 ---
S09 TINT+- -32 - +32 --- ±0 -3 +14 ---
S10 DETAIL+- -32 - +32 --- --- ±0 --- ---
No.
S11 R CUT OFF 0 - 255 30 --- --- --- --- --- --- ---
S12 G CUT OFF 0 - 255 30 --- --- --- --- --- --- ---
S13 B CUT OFF 0 - 255 30 --- --- --- --- --- --- ---
S14 R DRIVE 0 - 127 64 --- --- --- --- --- --- ---
S15 B DRIVE 0 - 127 64 --- --- --- --- --- --- ---
S16 R CUT +- -128 - +127 --- ±0 ±0 ±0 -5 --- --- ---
S17 G CUT +- -128 - +127 --- ±0 ±0 ±0 ±0 --- --- ---
S18 B CUT +- -128 - +127 --- ±0 ±0 ±0 -6 --- --- ---
S19 R DRV +- -128 - +127 --- +5 +13 +7 ±0 --- --- ---
S20 B DRV +- -128 - +127 --- +6 -25 -9 ±0 --- --- ---
S21NTSC MAT0 - 333112211
S22 BLACK ST 0 - 3 2 --- 2 --- --- --- --- ---
S23 DC REST 0 - 1 1 --- 1 --- --- --- --- ---
S24 DCRSW 0 - 1 1 --- 1 --- --- --- --- ---
Setting
item
Setting
item
Variable
range
Variable
range
RF
STANDARD THEATER STANDARD STANDARD
4 : 3 16 : 9 4 : 3 4 : 3 4 : 3
Initial setting value
AV-27F476/R AV-27F476/S
RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)
STANDARD THEATER STANDARD THEATER
LOW HIGH LOW HIGH LOW HIGH LOW HIGH
EXTERNAL
S / COMPOSITE
(
EXTERNAL
)
(COMPONENT)
Initial setting value
AV-32F476/Y
No.
S11 R CUT OFF 0 - 255 30 --- --- --- --- --- --- ---
S12 G CUT OFF 0 - 255 30 --- --- --- --- --- --- ---
S13 B CUT OFF 0 - 255 30 --- --- --- --- --- --- ---
S14 R DRIVE 0 - 127 64 --- --- --- --- --- --- ---
S15 B DRIVE 0 - 127 64 --- --- --- --- --- --- ---
1-18 (No.YA243)
Setting
item
Variable
range
RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)
STANDARD THEATER STANDARD THEATER
LOW HIGH LOW HIGH LOW HIGH LOW HIGH
AV-32F476/Z
Initial setting value
AV-32F476/Y
No.
S16 R CUT +- -128 - +127 --- ±0 ±0 ±0 ±0 --- --- ---
S17 G CUT +- -128 - +127 --- ±0 ±0 ±0 ±0 --- --- ---
S18 B CUT +- -128 - +127 --- ±0 ±0 ±0 ±0 --- --- ---
S19 R DRV +- -128 - +127 --- +5 +13 +7 ±0 --- --- ---
S20 B DRV +- -128 - +127 --- +6 -25 -9 ±0 --- --- ---
S21NTSC MAT0 - 333112211
S22 BLACK ST 0 - 3 2 --- 2 --- --- --- --- ---
S23 DC REST 0 - 1 1 --- 1 --- --- --- --- ---
S24 DCRSW 0 - 1 1 --- 1 --- --- --- --- ---
Setting
item
Variable
range
RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)
STANDARD THEATER STANDARD THEATER
LOW HIGH LOW HIGH LOW HIGH LOW HIGH
AV-32F476/Z
No.
S25 ASSY SHRP 0 - 7 4 4 4
S26 BPF FO 0 - 1 0 0 ---
S27 KILR OFF 0 - 1 0 0 ---
S28 KILR SEN 0 - 1 1 1 ---
No.
S29 RGB MUTE 0 - 1 0 0
S30 BLUE B 0 - 1 0 0
S31 VIDEO SW 0 - 3 3 3
S32 CMP ABCL 0 - 1 0 0
S33 OSD ABL 0 - 1 0 0
S34 OSD CONT 0 - 63 7 8
S35 SUB CONT 0 - 15 5 5
S36 ABL GAIN 0 - 3 0 0
S37 ABL PNT 0 - 3 3 3
S38 Y GAMMA 0 - 3 1 1
S39 Y MUTE 0 - 1 0 0
S40 SVM GAIN 0 - 3 3 3
S41 SVM PH 0 - 3 1 2
S42 WPL 0 - 1 0 0
S43 COL GMM 0 - 1 0 0
S44 V1 GAIN 0 - 7 4 4
S46 VMOFF DE -128 - +127 3 3
S47 APC CLK 0 - 1 1 1
S48 PIP ADJ 0 - 15 4 8
Setting
item
Setting
item
Variable
range
Variable
range
RF
Initial setting value
AV-27F476/R AV-27F476/S
AV-32F476/Y AV-32F476/Z
Initial setting value
EXTERNAL (S / COMPOSITE)
EXTERNAL (COMPONENT)
(No.YA243)1-19
4.7.2 [2. DEF (D)]
Initial setting value
No.
D01V FREQ0 - 3 003003003
D02AFC GAIN0 - 3 002002002
D03 H POSI 0 - 31 21 --- 21 19 --- 19 19 --- 19
D04 H POSI+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D05 V PHASE 0 - 7 0 --- 0 0 --- 0 0 --- 0
D06 V PH+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D07 V SIZE 0 - 127 105 --- 105 58 --- 58 45 --- 45
D08 V SIZE+- -128 - +127 --- -30 --- --- -30 --- --- -30 ---
D09 V CENTER 0 - 63 32 --- 32 32 --- 32 32 --- 32
D10 V CENT+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D11 V S CORR 0 - 15 7 --- 7 9 --- 9 8 --- 8
D12 V S CO+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D13 V LIN 0 - 15 10 --- 10 10 --- 10 8 --- 8
D14 V LIN+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D15 H SIZE 0 - 63 38 --- 38 49 --- 49 28 --- 28
D16 H SIZE+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D17WVMT TOP0 - 3 010010010
D18WVMT BTM0 - 3 010010010
D19 EWCR TOP 0 - 31 14 --- 14 14 --- 14 11 --- 11
D20 EWCR T+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D21 EWCR BTM 0 - 31 13 --- 13 16 --- 16 11 --- 11
D22 EWCR B+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D23 EW PARA 0 - 63 42 --- 42 35 --- 35 31 --- 31
D24 EW PARA+- -128 - +127 --- -15 --- --- -16 --- --- -16 ---
D25 V EHT 0 - 7 0 --- 0 0 --- 0 0 --- 0
D26 V EHT+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D27 H EHT 0 - 7 0 --- 0 0 --- 0 0 --- 0
D28 H EHT+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D29 TRAPEZ 0 - 63 30 --- 30 34 --- 34 36 --- 36
D30 TRAPEZ+- -128 - +127 --- 0 --- --- 0 --- --- 0 ---
D31V AGC 0 - 1 000000000
D32BLANK SW0 - 1 000000000
D33VRMP BI0 - 1 000000000
Setting
item
Variable
range
AV-27F476/R AV-27F476/S
RF
4 : 3 16 : 9 4 : 3 4 : 3 16 : 9 4 : 3 4 : 3 16 : 9 4 : 3
EXTERNAL
AV-32F476/Y AV-32F476/Z
RF
EXTERNAL
RF
EXTERNAL
1-20 (No.YA243)
4.7.3 [3. SOUND(A)]
No.
A01 IN LEVEL 0 - 15 9
A02 LOW SEP 0 - 63 41
A03 HI SEP 0 - 63 36
A04 SAPC 0 - 1 0
A05 BBE BASS -128 - +127 -2
A06 BBE TRE -128 - +127 -2
A07 AHS MVE -128 - +127 ±0
A08 AHS MSC -128 - +127 ±0
4.7.4 [4. OTHERS(F)] [Do Not adjust : All fixed]
Setting
item
Variable
range
Initial setting value
No.
F01 OSD POSI 0 - 255 39 39 42 42
F02OSD FREQ 0 - 25590909090
F03CCD POSI 0 - 25542424848
F04CCD FREQ 0 - 25591919393
F05CCD CONT 0 - 634444
F06PUR WBCK 0 - 10000
F07PUR CONT 0 - 632222
F08CCD PCHK 0 - 11111
F09VMOFF0 - 10000
F10VNR CHK 0 - 2553333
F11VCSN TM 0 - 2555555
F12 VM DAT A -128 - +127 +8 +127 +8 +8
F13 VM DAT B -128 - +127 +8 +8 -8 -8
F14 VM DAT C -128 - +127 -20 -8 -20 -20
F15 VM DAT D -128 - +127 -32 -20 -32 -32
F16VM DAT E 0 - 11111
F17XDSID TM 0 - 25515151515
F18FM TRAP 0 - 10000
Setting
item
Variable
range
AV-27F476/R AV-27F476/S AV-32F476/Y AV-32F476/Z
Initial setting value Initial setting value
(No.YA243)1-21
4.7.5 [5. 3L Y/C(LYC)] [Do not adjust : All fixed] 4.7.6 [12. SYSTEM(SYS)] [Do not adjust : All fixed]
No.
LYC01 MODE 0 - 7 4
LYC02 VENH 0 - 7 1
LYC03 PDSOFF 0 - 1 0
LYC04 CB 0 - 1 0
LYC05 VNLR 0 - 15 2
LYC06 GSEL0 0 - 1 0
LYC07 GSEL1 0 - 1 1
LYC08 COR 0 - 3 0
LYC09 TRAP 0 - 1 1
LYC10 CHTRAP 0 - 1 0
LYC11 CBPF 0 - 1 0
LYC12 ENHOFF 0 - 1 0
Setting
item
Variable
range
Initial setting value
No.
SYS01 VIDEO IN 0 - 4 3
SYS02 VSM 0 - 1 1
SYS03 CLR TEMP 0 - 1 1
SYS04 THEATER 0 - 1 1
SYS05 THEA PRO 0 - 1 1
SYS06 GAME MD 0 - 1 0
SYS07 AHS 0 - 1 0
SYS08 HYPER SR 0 - 1 1
SYS09 BBE 0 - 1 1
SYS10 S SOUND 0 - 1 1
SYS11 16:9 MD 0 - 3 1
SYS12 S CCD 0 - 1 1
SYS13 ID DISP 0 - 1 1
SYS14 CH LAB 0 - 1 1
SYS15 V LAB 0 - 1 1
SYS16 W CLOCK 0 - 1 1
SYS17 PIM 0 - 1 1
SYS18 PURITY 0 - 1 0
SYS19 VOL MUTE 0 - 1 1
SYS20 VCHIP 0 - 1 1
SYS21 VCHIP CA 0 - 1 1
SYS22 CCD 0 - 1 1
SYS23 HYPSCAN 0 - 1 1
SYS24 JVC LOGO 0 - 1 1
SYS25
Setting
item
PANORAMA
Variable
range
0 - 1 0
Initial setting value
1-22 (No.YA243)

4.8 ADJUSTMENT PROCEDURE

4.8.1 CHECK ITEM
Item
Measuring
instrument
Test point Adjustment part Description
B1 VOLTAGE DC voltmeter S1 Connector
1-pin : TP-E 5-pin : TP-91B [MAIN PWB]
HIGH VOLTAGE HOLD DOWN
Resistor (22.0kΩ, 1/4W)
S1 connector 2-pin : X-RAY2 3-pin : X-RAY1 [MAIN PWB]
RESISTOR
B1
CONNECTOR
45
3 2 1
S1
HEATER
HVT
(1) Receive the black and white signal. (color off) (2) Connect the DC voltmeter to the 1-pin and 5-pin of
S1 connector.
(3) Confirm that the voltage is DC134.5V±2V.
• After repairing the high voltage hold down circuit. This circuit shall be checked to operate correctly. (1) Turn the power switch to on. (2) Refer to the figure, connect the resistor between S1
connector 2-pin and 3-pin. (3) Make sure that the screen picture disappeares. (4) Disconnect the power plug. (5) Remove the resistor. (6) Again connect the power plug. (7) Turn the power switch to on. (8) Make sure that the normal picture is displayed on the
screen.
4.8.2 FOCUS
Item
Measuring
instrument
FOCUS Signal
generator
4.8.3 DEFLECTION CIRCUIT
Item
V. SIZE / V. POSITION
Measuring
instrument
Signal generator
(4:3)
Remote control unit
Screen
size
4
Test point Adjustment part Description
FOCUS VR [In HVT]
(1) Receive the crosshatch signal. (2) While watching at the screen, adjust the FOCUS VR
to the vertical and horizontal lines will be thinnest
and sharpest center horizontal line. (3) Make sure that the picture is in focus even when the
screen gets darkened.
Test point Adjustment part Description
[2.DEF (D)] D05: V PHASE D07: V SIZE D11: VS CORR D13: V LIN
(1) Receive the crosshatch signal. (2) Select 2.DEF(D) from the SERVICE MODE. (3) Select < D05 > (V PHASE). (4) Set the initial setting of < D05 >. (5) Adjust V. CENTER SW to agree the vertical center
with display center. (6) Select < D07 > (V SIZE). (7) Adjust < D07 > to the vertical screen size become
setting value is 92%.
NOTE:
• Bottom is to be located within the 85%-95% range.
Picture
size
100%
V. CENTER SW
)
(S1421 [MAIN PWB]
• When vertical linearity is not even, adjust < D13 > (V
LIN) and < D11 > (VS CORR) to vertical linearity
(No.YA243)1-23
Item
V. SIZE / V. POSITION (16:9)
B
[B=B']
B'
Measuring instrument
Signal generator
Remote control unit
Test point Adjustment part Description
[2.DEF (D)] D08: V. SIZE+­D14: V. LIN+-
• V. SIZE / V. POSITION (4:3) adjustment should be finished.
(1) Receive a black and white signal (color off). (2) Select 16:9 mode. (3) Confirm that the width of V. BLANKING is equal to
adjustment value (B).
(4) If the value (B) is not correct, select 2.DEF(D) from
the SERVICE MODE.
(5) Adjust < D08 > (V. SIZE+-) and < D14 > (V. LIN+-)
to be same to adjustment value (B).
NOTE :
• When you change the VERTICAL adjustment value of the regular mode (4:3), review the adjustment of 16:9 mode again.
Adjust point
B
H. SIZE / H. POSITION / SIDE PIN (4:3)
H. POSITION / H. SIZE / SIDE PIN (16:9)
Setting value
50mm
Signal generator
Remote control unit
Screen size
Picture size 100%
Signal generator
Remote control unit
Screen size
Picture size 100%
[2.DEF (D)] D03: H POSI D15: H SIZE D23: EW PARA D19: EWCR TOP D21: EWCR BTM
[2.DEF (D)] D16: H SIZE+­D04: H POSI+­D24: EW PARA+­D20: EWCR T+­D22: EWCR B+-
(1) Receive the crosshatch signal. (2) Select 2.DEF(D) from the SERVICE MODE. (3) Select < D03 > (H POSI). (4) Adjust < D03 > to the left width and right width of the
crosshatch screen becomes equal. (5) Select < D15 > (H SIZE). (6) Adjust < D15 > to the horizontal screen size become
setting value is 90%. (7) Select < D23 > (EW PARA). (8) Adjust < D23 > to vertical line at both side to become
straight. (9) If it is necessary, readjust step 3 to 8.
NOTE:
If it is not straight at the vertical upper and bottom corner line, adjust the upper and bottom conrner pin by < D19 > (EWCR TOP) amd < D21 > (EWCR BTM).
• V. SIZE / V. POSITION adjustment should be finished.
• H. SIZE / H. POSITION / SIDE PIN adjustment should be finished. (Regular size(4:3)).
(1) Receive the crosshatch signal. (2) Select 16:9 mode. (3) Select 2.DEF(D) from the SERVICE MODE. (4) Confirm both sides of crosshatch to be the
adjustment value 90%.
(5) If the value is not correct, adjust < D16 > (H SIZE+-)
and < D04 > (H POSI+-) to the horizontal screen size become setting value is 90%.
(6) Confirm the second vertical line from left to right to
be straight.
(7) If it is not straight, adjust to be straight by < D24 >
(EW PARA+-), < D20 > (EWCR T+-) and < D22 > (EWCR B+-).
NOTE :
• Review the adjustment of 16:9 mode again when you change the SIDE PIN adjustment value of regular (4:3) mode.
1-24 (No.YA243)
4.8.4 VIDEO CIRCUIT
Item
WHITE BALANCE
Measuring
instrument
Signal generator
(LOW LIGHT)
Remote control unit
REMOTE CONTROL UNIT
H.LINE ON
R CUTOFF B CUTOFF
R CUTOFF B CUTOFF
H.LINE OFF EXIT
G CUTOFF
G CUTOFF
Test point Adjustment part Description
[1.V/C (S)] S01: BRIGHT S11: R CUTOFF S12: G CUTOFF S13: B CUTOFF
(1) Receive the black and white signal ( color off ). (2) Select the 1.V/C (S) from the SERVICE MODE. (3) Confirm the initial setting value of < S11 > (R
CUTOFF), < S12 > (G CUTOFF), < S13 > (B CUTOFF) and < S01 > (BRIGHT).
(4) Return to the main menu in SERVICE MODE.
[7.LOW LIGHT]
(5) Select the 7.LOW LIGHT from the SERVICE MODE.
(6) Display a single horizontal line by pressing the [1] SCREEN VR [in HVT]
key. (7) Turn the SCREEN VR all the way to the left. (8) Turn the SCREEN VR gradually to the right from the
left until either one of the red, blue or green colors
appears faintly. (9) Adjust the two colors which did not appear until the
single horizontal line that is displayed becomes
white using the [4] to [9] keys.
(10) Turn the SCREEN VR until the single horizontal line
is displayed faintly.
(11) Press the [2] key to cancel the single horizontal line
mode.
(12) Return to the main menu in SERVICE MODE. (13) Select the 1.V/C (S) from the SERVICE MODE. (14) Adjust the BRIGHT level to become the black
component shines white slightly by < S01 >.
(15) Confirm that whether the color ingredient of R, G, or
B is visible to the black component, which shines
white slightly.
(16) When the color ingredient can be seen, two colors
other than a visible color are adjusted, and it is made
to look white.
(17) Return the value of < S01 > to initial setting value.
WHITE BALANCE
Signal generator
(HIGH LIGHT)
Remote control unit
REMOTE CONTROL UNIT
R DRIVE
R DRIVE
SUB BRIGHT Remote
control unit
EXIT
B DRIVE
B DRIVE
[1.V/C (S)] S14: R DRIVE S15: B DRIVE
[8.HIGH LIHGT]
[1.V/C (S)] S01: BRIGHT
•The [3] (EXIT) key is the cancel key for the WHITE BALANCE.
(1) Receive the black and white signal (color off). (2) Select the 1.V/C (S) from the SERVICE MODE. (3) Set the initial setting value of < S14 > (R DRIVE) and
< S15 > (B DRIVE). (4) Return to the main menu in SERVICE MODE. (5) Select the 8.HIGH LIGHT from the SERVICE
MODE. (6) Adjust the screen until it becomes white using the
[4], [6], [7] and [9] keys.
•The [3] (EXIT) key is the cancel key for the WHITE BALANCE.
(1) Receive any broadcast. (2) Select the 1.V/C (S) from the SERVICE MODE. (3) Select < S01 > (BRIGHT). (4) Set the initial setting value of < S01 >. (5) If the brightness is not the best with the initial setting
value, make fine adjustment of < S01 > until you get the optimum brightness.
(No.YA243)1-25
Item
SUB CONTRAST
Remote control unit
4.8.5 MTS CIRCUIT
Item
MTS INPUT LEVEL
MTS SEPARATION
Remote control unit
TV audio multiplex signal generator
Oscilloscope
Remote control unit
L-Channel signal waveform
Measuring instrument
Measuring instrument
Test point Adjustment part Description
[1.V/C (S)] S02: PICTURE
(1) Receive any broadcast. (2) Select the 1.V/C (S) from the SERVICE MODE. (3) Select < S02 > (PICTURE). (4) Set the initial setting value of < S02 >. (5) If the contrast is not the best with the initial setting
value, make fine adjustment of the < S02 > until you get the optimum contrast.
Test point Adjustment part Description
[3.SOUND (A)] A01: IN LEVEL
(1) Receive any broadcast. (2) Select the 3.SOUND (A) from the SERVICE MODE. (3) Select the < A01 > (IN LEVEL). (4) Set the initial setting value of < A01 >.
R OUT L OUT [AUDIO OUT]
[3.SOUND (A)] A02: LOW SEP. A03: HI SEP.
(1) Input the stereo L signal (300 Hz) from the TV audio
multiplex signal generator to the antenna terminal.
(2) Connect an oscilloscope to R OUT pin of the AUDIO
OUT, and display one cycle portion of the 300 Hz
signal. (3) Select the 3.SOUND (A) from the SERVICE MODE. (4) Select the < A02 > (LOW SEP.). (5) Set the initial setting value of < A02 >. (6) Adjust the < A02 > so that the stroke element of the
300Hz signal will become minimum. (7) Change the connection of the oscilloscope to L OUT
R-Channel crosstalk portion
Minimum
pin of the AUDIO OUT, and enlarge the voltage axis. (8) Change the signal to 3 kHz, and similarly adjust
< A03 > (HI SEP.).
1 cycle
1-26 (No.YA243)
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
(No.YA243)1-27
Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan
(No.YA243)
Printed in Japan
VPT
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