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AV28BT5EES / AV28BT5EEB
SERVICE MANUAL, PARTS LIST, SCHEMATICS
JVC COLOUR TELEVISION
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
SERVICE MANUAL
COLOUR TELEVISION
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
CONTENTS
SPECIFICATIONS 2 SAFETY PRECAUTIONS 4 FEATURES 5 MAIN DIFFERENCE PARTS LIST 5 SPECIFIC SERVICE INSTRUCTIONS 6 SERVICE ADJUSTMENTS 9 PARTS LIST 17 OPERATING INSTRUCTIONS STANDARD CIRCUIT DIAGRAM 2-1
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COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
No.51881 Dec. 2001
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
SPECIFICATIONS
Content ITEM Dimensions (WxHxD) Weight TV RF System Colour System Teletext System Stereo System Tuning System Number Of CH memory position VHF (VL) Receiving Frequency VHF (VH) UHF CATV VIF Carrier Intermediate Frequency TV Mode Video Mode AV28BT5ENS (Silver) AV28BT5ENB (Black) 69 x 54 x 47 cm 34.6 kg B/G PAL PAL / NTSC 3.58 / NTSC 4.43 Fastext / Toptext A2 / German + NICAM Frequency Synthesizer Tuning System 100 ch 46.25MHZ ~ 168.25MHz 175.25MHz ~ 463.25MHz 471.25MHz ~ 863.25MHz Super (S11-S20) & Hyper (S21-S41) bands receivable 38.9MHz 32.4MHz (6.5MHz) SIF Carrier 32.9MHz (6.0MHz) 33.4MHz (5.5MHz) Colour Sub Carrier Frequency Aerial Input Terminal Power Input Power Consumption Picture Tube High Voltage Speaker Audio Output Video Input S/Video Audio (L/R) Output Video Audio (L/R) Rear Side Front Side Front Side Output Terminal Remote Control Unit Rear Side PAL (4.43MHz), SECAM (4.43MHz), NTSC (3.58MHz/4.43MHz) 75Ohm Unbalanced AC 170 ~ 270V 126W(Max.)/103W(Avg.) Stand-by<5W 28 inch measured diagonally 28kV (in cut-off service mode) 101 mm round type X 2 8W + 8W 1Vp-p, 75 Ohm Y: 1Vp-p Positive C: 0.286Vp-p 500 mVrms, High Impedance 1 Vp-p, 75 Ohm 500 mVrms, Low Impedance AV1 (Video/Audio/RGB) AV2 (Video/Audio/S-VHS) AV3 (Video/Audio) Headphone jack (Stereo mini jack 3.5 ) AV1 (Video/Audio) AV2 (Video/Audio) (Selected TV, AV1 or AV3) RM-C85, Battery size:AAA/R03 x 2 B/G, D/K, K1 PAL / SECAM PAL / SECAM / NTSC 3.58 / NTSC 4.43 AV28BT5EES (Silver) AV28BT5EEB (Black)
Input Terminal
Design & specifications are subject to change without notice.
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No.51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
21-pin Euro connector (SCART socket) : AV-1 / AV-2
(P-P= Peak to Peak, S-W= Sync tip to white peak, B-W= Blanking to white peak)
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Signal Designation AUDIO R output AUDIO R input AUDIO L output AUDIO GND GND (B) AUDIO L input B input FUNCTON SW (SLOW SW) GND (G) G input GND (R) GND (YS) R / C input Ys input GND(VIDEO output) GND(VIDEO input) VIDEO output VIDEO / Y input COMMON GND 1VS-W (Negative going sync), 75 1VS-W (Negative going sync), 75 R : 700mVB-W , 75 C : 300mVP-P, 75 Low : 0 0.4, High : 1 - 3V, 75 700mVB-W , 75 500mVrms(Nominal), High impedance 700mVB-W , 75 Low : 0-3V, High : 8-12V, High impedance Matching Value 500mVrms(Nominal),Low impedance 500mVrms(Nominal),High impedance 500mVrms(Nominal),Low impedance AV-1 (TV OUT) (TV OUT) NC NC (R/C) (TV) AV-2 (TV/LINE OUT) (TV/LINE OUT) NC NC NC NC (only C) NC (TV/LINE OUT)
[Pin assignment]
No.51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
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 product 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 necessary 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 the 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. Don't short between the LIVE side ground and ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing. Some models 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 measnure with a measuring apparatus (oscilloscope etc.) the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND at the same time. If above note willl not be kept, a fuse or any parts will be broken. 5. If any repair has been made to the chassis, it is recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY). 6. The high voltage applied to the picture tube must conform with that specified in Srevice 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 minimum, or should be preveted. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspecton (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. 7. 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 2W resistor to the anode button. 8. When service is required, observe the original lead dress. Extra precaution should be given to assure correct lead dress in the hig voltage circuit area. Where a short curcuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components. 9. 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, videl/audio input and output terminals, Control knobs, metal cabinet, screwheads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. (1) 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 3000V AC(r.m.s.) for a period of one second. ( . . .Withstand a voltage of 1100V AC (r.m.s.) to an appliance rated 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. (2) 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 knowm good earth ground (water pipe, etc.). Any leakege current must not exceed 0.5mA 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 ohms per volt or more sensitivity in the following manner. Connect a 1500 10W resistor paralleled by a 0.15F AC-type capacitor between an exposed metal part 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 earch measurement. Any voltage measured must mot exceed 0.35V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.).
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No.51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
FEATURES
1. It is a remte controlled color television. 2. 100 programs from VHF, UHF bands or cable channels can be preset. 3. It can tune cable channels. 4. Controlling the TV is very easy by its menu driven system. 5. It has two Euroconnector sockets for external device (such as video recorder, video games, audio set, etc.) 6. Front AV Input available. 7. Stereo sound systems (German + Nicam) are available. 8. Full function Teletext (Fastext, Toptext). 9. 10. 11. 12. 13. 14. 15. It is possible to connect headphone. Direct channel access. APS (Automatic Programming System). All programs can be named. Forward or backward automatic tuning. Automatic sound mute when no transmission. 5 minutes after the broadcasting (closedown), the TV switches itself automatically to stand-by mode.
MAIN DIFFERENCE LIST
MODEL No. Parts Name MAIN PWB F CARTON BOX INST BOOK RATING LABEL FRONT CABINET BACK COVER AV28BT5ENS (Silver) VE-20073586 VE-20074229 VE-50021021 VE-20074227 VE-20073707 VE-20004635 AV28BT5ENB (Black) VE-20073917 VE-20073915 VE-20003525 VE-20016402 AV28BT5EES (Silver) VE-20073447 VE-20074101 VE-50021020 VE-20074100 VE-20073707 VE-20004635 AV28BT5EEB (Black) VE-20074115 VE-20074113 VE-20003525 VE-20016402
No.51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Remove the 8 screws marked A. 2. Withdraw the rear cover toward you.
REMOVING THE MAIN PWB & PROCEDURE TO DEVELOPMENT
1. 2. 3. 4. After removing the rear cover. Remove the JACK BOARD ASS'Y. Remove the LEFT SPEAKER BKT ASS'Y. Remove the POWER SUPPLY TRANSFORMER. Remove the 2 screws marked F atached to the MAIN PWB ASS'Y. CAUTIONS) Be careful enough when developing a main chassis. The wire of a POWER TRANSFER does not separate and short-circuit with other parts.
REMOVING THE HEADPHONE JACK BOARD ASS'Y
After removing the rear cover. 1. Remove the 1 screw marked B. 2. After pulling JACK BOARD back, it shifts rightward.
REMOVING THE SPEAKER
After removing the rear cover. 1. Remove the 2 screws marked C, and remove the SPEAKER BKT ASS'Y. 2. Remove the 4 screws marked D, and remove the SPEAKER BKT COVER. 3. Remove the 4 screws marked E, and remove the SPEAKER.
REMOVING THE FRONT CONTROL PWB
After removing the rear cover. 1. Remove the MAIN PWB ASS'Y. 2. Remove the 6 screws marked G, and remove the FRONT CONTROL PWB.
REMOVING THE POWER SW
After removing the rear cover. 1. Remove the MAIN PWB ASS'Y. 2. Remove the 2 screws marked H, and remove the POWER SW.
A (×8)
SPEAKER BKT REAR COVER
F (×2)
(×6) (×2)
E (×4) G H D (×4)
SPEAKER BKT POWER SW FRONT CONTROL PWB
B
HEADPHONE JACK
SPEAKER
C (×2)
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No.51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
SETTING OF THE LAST MEMORY FOR SHIPMENT
USER SETTING VALUES
Setting Item SOUND MENU BASS TREBLE BALANCE EFFECT PICTURE MENU BRIGHTNESS COLOUR CONTRAST SHARPNESS HUE (only NTSC) PICTURE MODE These adjust are automatically restored when APS bit in Service menu is set. The procedure for selling APS bit is discribed bellow. AUTO CENTER OFF INSTALL-> TV CONFIG. MENU LANGUAGE COUNTRY AV-2 OUTPUT ENGLISH ? TV SLEEP TIMER CHILD LOCK Setting Value Setting Item FEATURE MENU OFF OFF Setting Value
SETTING APS BIT IN SERVICE MENU
Enter service menu in TV mode by pressing "INFO" and "MUTING" keys simultaneously. Service Menu will appear. Select OPTIONS by pressing Up/Down keys on remote control unit. Enter OPTIONS by pressing Left/Right keys on remote control unit. Select OPTION 8 by pressing Up/Down keys on remote control unit. Selected bit in one OPTION is shown by blinking character. Select B2 by pressing Left/Right keys on remote control unit. DO NOT CHANGE ANY OTHER BIT. 6) Press digit key "1" to set APS bit. 7) Press "STANDARD" key on remote control unit to exit service mode. 1) 2) 3) 4) 5)
No.51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
REPLACEMENT OF CHIP COMPONENT
CAUTIONS
1. 2. 3. 4. Avoid heating for more than 3 seconds. Do not rub the electrodes and the resist parts of the pattern. When removing a chip part, melt the solder adequately. Do not reuse a chip part after removing it.
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.
REPLACEMENT STEPS
1. How to remove 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. How to install Chip parts
Resistors, capacitors, etc. (1) Apply solder to the pattern as indicated in the figure.
(2) Shift with tweezers and remove the chip part.
(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 extra solder to each lead.
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.
SOLDER
SOLDER
(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.
A B C (4) Then solder leads B and C. A B
Note : After removing the part, remove remaining solder from the pattern.
C
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No. 51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You can make the necessary adjustments for this unit with either the Remote Control Unit or With the adjustment tools and parts as given below. 2. Adjustment with the Remote Control Unit is made on the basis of the initial setting values, however, the new setting values which set the screen to its optimum condition may differ from the initial settings. 3. Make sure that AC power is turned on correctly. 4. Turn on the power for set and test equipment before use, and start the adjustment procedures after waiting at least 30 minutes. 5. Unless otherwise specified, prepare the most suitable reception or input signal for adjustment. 6. Never touch any adjustment parts which are not specified in the list for this adjustment - variable resistors, transformers, condensers, etc. 7. Presetting before adjustment. Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit: VIDEO STATUS TINT/COLOR PICTURE/BRIGHT DETAIL CENTER STANDARD
ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltmeter) 2. Signal generator (Pattern generator)PAL/SECAM/NTSC 3. Remote control unit
MAIN PARTS LOCATIONS
TOP
LED
REMOCON RECEIVER
VIDEO
R L AUDIO.
MENU
PROG /Ch.
VOL
IC502 MEMORY IC IC501 MICOM
FRONT
FBT
MULTI SOUND PWB
TUNER
SCART-1
SCART-2
B1 (Indicated [150/115V] on the bottom side)
UPPER : FOCUS VR LOWER : SCREEN VR
No. 51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
BASIC OPERATION SERVICE MENU
HOW TO ENTER THE SERVICE MODE
1) Press the INFORMATION key and MUTING key of REMOTE CONTROL UNIT, simultaneously.
SERVICE ADJUST..... OPTIONS..... SERVICE MENU SCREEN *** ADJUST *** OUT UP ***
SELECTION OF ADJUSTMENT ITEMS
1) 2) 3) Press the UP ( ) or DOWN ( ) key and select the ADJUSTMENT ITEM. Press the RIGHT ( ) or LEFT ( ) key and enter ADJUSTMENT SCREEN. To change the selected Parameter, use RIGHT ( ) and ) key. LEFT (
HOW TO EXIT SERVICE MODE
1) Press the STANDARD Key on REMOTE CONTROL UNIT.
ADJUSTMENT SCREEN
ADJUSTMENT SERVICE MENU
ADJUSTMENT ITEM ADJUST No.
00 WHITE BALANCE 01 02 AGC IF-PLL NEGATIVE IF-PLL POSITIVE 03 04 05 06 LUMINANCE DELAY 07 08 VERTICAL ZOOM 10 21 11 22 12 23 13 24 14 25 15 26 16 27 17 28 18 29 19 30 20 31
DISCRIPTION
White Point RED White Point GREEN White Point BLUE AGC IF-PLL Negative IF-PLL Positive Y-Delay PAL Y-Delay SECAM Y-Delay NTSC 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE 4 : 3 PICTURE MODE 16 : 9 PICTURE MODE
REMOTE CONTROL UNIT key NAME
MUTING key
UP / DOWN key
STANDARD key
VERTICAL SCROLL
RIGHT / LEFT key
4 : 3 HORIZONTAL SHIFT
VERTICAL SLOPE
VERTICAL AMPLITUD
S-CORRECTION
INFORMATION key
VERTICAL SHIFT
EW WIDTH
EW PARABOLA WIDTH
EW CORNER PARABOLA
EW TRAPEZIUM
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No. 51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
ADJUSTMENTS
Item SCREEN VOLTAGE Adjustment Measuring instrument Signal Generator Remote Control unit Test point Adjustment part SCREEN VR [FBT] OPTION 02 Description 1. Receive a PAL colour bar. 2. Enter the Option settings in the SERVICE MENU. 3. Press the function / key, and Enter Option 02. 4. To change bit 6, come on to it by using function / and make it "1" by pressing "1" white bit 2 is blinking. 5. Observe the thin horizontal blue-white line in the middle of the screen, and adjust the lower VR of the FBT, until the line is in its thinnest visible thickness. 6. Then make Option 02 bit 6 "0" , by pressing "0" on the remote control unit, although you do not see any picture.
FOCUS Adjustment
Signal generator
FOCUS VR [FBT]
1. Receive a PAL circle pattern. 2. Adjust the upper VR of the FBT, until you get the Optinum focus, the sharpest picture.
B1 VOLTAGE check
DC Voltmeter
Marked [150/115V] on the MAIN PWB
1.
Check whether the voltage at the point named and silk screened as "150 / 115V" on the MAIN PWB is 150V DC.
No. 51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
Item WHITE BALANCE
Measuring instruments Signal generator
Test point
Adjustment part ADJUST 00 (White point - RED) ADJUST 01 (White point - GREEN) ADJUST 02 (White point - BLUE) [LOW LIGHT]
Description
1. Receive a whole black signal. 2. Adjust the , , , in the SERVICE MENU so that the entire screen do not shine black.
[HIGH LIGHT] 1. Receive a white and black signal (colour off). 2. Adjust the , , , in the SERVICE MENU so that the whiteness in the screen become sharp.
AGC Adjustment
DC voltmeter
ADJUST 03
1. 2. 3.
Receive a any broadcast. Select from SERVICE MENU Connect a DC voltmeter to pin 1 of the tuner. Change the AGC parameter until you see 3.70VDC on voltmeter display.
IF-PLL NEGATIVE Adjustment
ADJUST 04
1. 2.
Select from SERVICE MENU. Adjustment value is set to 80 as a default value.
IF-PLL POSITIVE Adjustment
ADJUST 05
1. 2.
Select from SERVICE MENU. Adjustment value is set to 80 as a default value.
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No. 51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
Item LUMINANCE DELAY Adjustment
Measuring instruments Signal generator
Test point
Adjustment part Adjust 06 [ Y-Delay PAL ]
Description
1. Receive a PAL colour bar signal. 2. Select from SERVICE MENU. 3. Adjust Y-Delay PAL till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible. Note: If the SAW filter is one of the G1965M, J1951M, K2958M, K2962M, G3957M, K6256K, K6259K or M1963M, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
Adjust 07
[ Y-Delay SECAM ] 1. Receive a SECAM colour bar signal. 2. Select from SERVICE MENU. 3. Adjust Y-Delay SECAM till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible. Note: If the SAW filter is one of the G1965M, K2958M, K2962M, G3957M, K6256K or K6259K, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
Adjust 08
[ Y-Delay NTSC ] 1. Receive a NTSC colour bar signal. 2. Select from SERVICE MENU. 3. Adjust Y-Delay NTSC till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible. Note: If the SAW filter is M1963M, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
No. 51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
Item VERTICAL ZOOM Adjustment
Measuring instruments Signal generator
Test point
Adjustment part Adjust 10 ( 4 : 3 ) Adjust 21 ( 16 : 9 ) 1. 2. 3. 4.
Description Receive a PAL circle test pattern. Set < 4 : 3 aspect mode >. Select < ADJUST 10 > from SERVICE MENU. Change vertical zoom till you see the upper and olwer limit of the circle as close to the upper and lower limit of the picture tube as possible. 5. Set < 16 : 9 aspect mode >. 6. Adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too.
VERTICAL SCROLL Adjustment
Signal generator
Adjust 11 ( 4 : 3 ) Adjust 22 ( 16 : 9 )
1. 2. 3. 4.
Receive a PAL circle test pattern. Set < 4 : 3 aspect mode >. Select < ADJUST 11 > from SERVICE MENU. Change vertical scroll till you see the circle exactly un the middle of the screen. 5. Set < 16 : 9 aspect mode >. 6. Adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. 1. 2. 3. 4. Receive a RED PURITY test pattern. Set < 4 : 3 aspect mode >. Select < ADJUST 12 > from SERVICE MENU. Change horizontal shift till the picture is horizontally centered. Check whether this adjustment is correct after completing Service Mode Adjustment. 5. Set < 16 : 9 aspect mode >. 6. Adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. Receive a CROSS-HATCH signal. Set < 4 : 3 aspect mode >. Select < ADJUST 13 > from SERVICE MENU. Change vertical slope till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern. 5. Check and readjust VERTICAL SLOPE item if the adjustment becomes improper after some other geometric adjustments are done. 6. Set < 16 : 9 aspect mode >. 7. Adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too.
4:3 HORIZONTAL SHIFT Adjustment
Signal generator
Adjust 12 ( 4 : 3 ) Adjust 23 ( 16 : 9 )
VERTICAL SLOPE Adjustment
Signal generator
Adjust 13 ( 4 : 3 ) Adjust 24 ( 16 : 9 )
1. 2. 3. 4.
VERTICAL AMPLITUDE Adjustment
Signal generator
Adjust 14 ( 4 : 3 ) Adjust 25 ( 16 : 9 )
1. 2. 3. 4.
Receive a PAL test pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 14 > from SERVICE MENU. Change vertical slope till horizontal black lines on both the upper and lower part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about to disappear. 5. Check and readjust VERTICAL AMPLITUDE item if the adjustment becomes improper after some other geometric adjustments are done. 6. Set < 16 : 9 aspect mode >. 7. Adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too.
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No. 51881
AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
Item
Measuring instrument
Test point
Adjustment part Adjust 15 ( 4 : 3 ) Adjust 26 ( 16 : 9 ) 1. 2. 3. 4.
Description Receive a PAL circle pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 15 > from SERVICE MENU. Change S-correction till the middle part of the circle is round as possible. 5. Set < 16 : 9 aspect mode >. 6. Adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. 1. Receive a PAL test pattern signal ( or the symmetrical signal in the top and the bottom and on either side to find ). 2. Set < 4 : 3 aspect mode >. 3. Select < ADJUST 16 > from SERVICE MENU. 4. Change Vertical Shift till the test pattern is vertically centred, i.e. horizontal line at the centre pattern is in equal distance both to upper and lower side of the picture tube. 5. Check and readjust Vertical Shift item if the adjustment becomes improper after some other geometric adjustments are done. 6. Set < 16 : 9 aspect mode >. 7. Adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. 1. 2. 3. 4. Receive a PAL test pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 17 > from SERVICE MENU. Change EW Width till the vertical black and white bars on both left and right side of the pattern exactly disappear. 5. Set < 16 : 9 aspect mode >. 6. Adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. 1. 2. 3. 4. Receive a PAL test pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 18 > from SERVICE MENU. Change EW Parabola Width till vertical lines close to the both sides of the picture frame become parallel to vertical side of picture tube. 5. Check and readjust EW Parabola Width item if the adjustment becomes improper after some other geometric adjustments are done. 6. Set < 16 : 9 aspect mode >. 7. Adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. 1. 2. 3. 4. Receive a PAL test pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 19 > from SERVICE MENU. Change EW Corner Parabola till vertical lines at the corners of both sides of picture frame become vertical and parallel to vertical corner sides of picture tube. 5. Check and readjust EW Corner Parabola item if the adjustment becomes improper after some other geometric adjustments are done. 6. Set < 16 : 9 aspect mode >. 7. Adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too.
S-CORRECTION Signal Adjustment generator
VERTICAL SHIFT Adjustment
Signal generator
Adjust 16 ( 4 : 3 ) Adjust 27 ( 16 : 9 )
EW WIDTH Adjustment
Signal generator
Adjust 17 ( 4 : 3 ) Adjust 28 ( 16 : 9 )
EW PARABOLA WIDTH Adjustment
Signal generator
Adjust 18 ( 4 : 3 ) Adjust 29 ( 16 : 9 )
EW CORNER Signal PARABOLA generator Adjustment
Adjust 19 ( 4 : 3 ) Adjust 30 ( 16 : 9 )
No. 51881
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AV28BT5ENS / AV28BT5ENB AV28BT5EES / AV28BT5EEB
Item EW TRAPEZIUM Adjustment
Measuring instrument Signal generator
Test point
Adjustment part Adjust 20 ( 4 : 3 ) Adjust 31 ( 16 : 9 ) 1. 2. 3. 4.
Description Receive a PAL circle pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 15 > from SERVICE MENU. Change EW Trapezium till vertical lines, especially lines at the sides of the picture frame became parallel to the both sides of picture tube as possible. 5. Check and readjust EW Trapezium item if the adjustment becomes improper after some other geometric adjustment. 6. Set < 16 : 9 aspect mode >. 7. Adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too.
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No. 51881
VICTOR COMPANY OF JAPAN, LIMITED HOME AV NETWORK BUSINESS UNIT 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa-prefecture, 221-8528, Japan
4
VP 0112 DP205180