JVC AV28BT7ENS User manual

No.51883
AV28BT7ENS / AV28BT7ENB
AV28BT7EES / AV28BT7EEB
AV28BT7EPS / AV28BT7EPB
1COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
Jan. 2002
AV28BT7ENS / AV28BT7ENB
AV28BT7EES / AV28BT7EEB
AV28BT7EPS / AV28BT7EPB
CONTENTS
SPECIFICATIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････････････････････
･･････････････････････････････････････････････････････････
･････････････････････････････ 2
SAFETY PRECAUTIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････････････････････････
･･････････････････････････････････････････････
･･･････････････････････ 4
FEATURES････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････
･･････
･･･ 5
MAIN DIFFERENCE LIST ････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････････････････････････
･･････････････････････････････････････････････
･･･････････････････････ 5
SPECIFIC SERVICE INSTRUCTIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････
･･････････････････････････
･････････････ 6
SERVICE ADJUSTMENTS ････････････････････････････････
････････････････････････････････････････････････････････････････
･･････････････････････････････････････････････････････
････････････････････････････････････････････
･･････････････････････ 9
PARTS LIST ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････
･･
･17
★
OPERATING INSTRUCTIONS
★
STANDARD CIRCUIT DIAGRAM ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････
････････････････････････････････
････････････････ 2-1
SERVICE MANUAL
COLOUR TELEVISION

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
2
SPECIFICATIONS
Content
ITEM AV28BT7ENS (Silver)
AV28BT7ENB (Black)
AV28BT7EES (Silver)
AV28BT7EEB (Black)
AV28BT7EPS (Silver)
AV28BT7EPB (Black)
Dimensions (WxHxD) 77 x 58 x 48 cm
Weight 33.2 kg
TV RF System B/G B/G, D/K, K1 B/G, L/L’
TV Mode PAL PAL / SECAM
Colour System
Video Mode PAL / NTSC 3.58 /
NTSC 4.43
PAL / SECAM / NTSC 3.58 /
NTSC 4.43
Teletext System Fastext / Toptext
Stereo System A2 / German + NICAM
Tuning System Frequency Synthesizer Tuning System
Number Of CH memory position 100 ch
VHF (VL) 46.25MHZ ~ 168.25MHz
VHF (VH) 175.25MHz ~ 463.25MHz
UHF 471.25MHz ~ 863.25MHz
Receiving Frequency
CATV Super (S11-S20) & Hyper (S21-S41) bands receivable
VIF Carrier 38.9MHz
32.4MHz (6.5MHz)
32.9MHz (6.0MHz)
Intermediate Frequency SIF Carrier
33.4MHz (5.5MHz)
Colour Sub Carrier Frequency PAL (4.43MHz), SECAM (4.43MHz), NTSC (3.58MHz/4.43MHz)
Aerial Input Terminal 75Ohm Unbalanced
Power Input AC 220 ~ 240V, 50Hz
Power Consumption 120W(Max.)/103W (Avg.)
Picture Tube 28 inch measured diagonally
High Voltage 28kV (in cut-off service mode)
Speaker 57 ×160 mm ellipse type ×2
Audio Output 8W + 8W
Video 1Vp-p, 75 Ohm
S/Video Y: 1Vp-p Positive
C: 0.286Vp-p
Input
Audio (L/R) 500 mVrms, High Impedance
Video 1 Vp-p, 75 Ohm
Output Audio (L/R) 500 mVrms, Low Impedance
AV1 (Video/Audio/RGB)
Rear Side AV2 (Video/Audio/S-VHS)
Input Terminal
Front Side AV3 (Video/Audio)
Front Side Headphone jack (Stereo mini jack 3.5)
AV1 (Video/Audio)
Output Terminal Rear Side AV2 (Video/Audio) (Selected TV, AV1 or AV3)
Remote Control Unit RM-C85, Battery size:AAA/R03 x 2
Design & specifications are subject to change without notice.

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
3
■
■■
■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. Signal Designation Matching Value AV-1 AV-2
1 AUDIO R output 500mVrms(Nominal),Low impedance ○
(TV OUT)
○
(TV/LINE OUT)
2 AUDIO R input 500mVrms(Nominal),High impedance ○○
3 AUDIO L output 500mVrms(Nominal),Low impedance ○
(TV OUT)
○
(TV/LINE OUT)
4 AUDIO GND ○○
5 GND (B) ○○
6 AUDIO L input 500mVrms(Nominal), High impedance ○○
7Binput 700mVB-W, 75Ω○
NC
8FUNCTON SW
(SLOW SW) Low : 0-3V, High : 8-12V, High impedance ○NC
9 GND (G) ○○
10 - NC -
11 G input 700mVB-W, 75Ω○
NC
12 -NC -
13 GND (R) ○○
14 GND (YS) ○NC
15 R / C input R : 700mVB-W, 75Ω
C : 300mVP-P, 75Ω
○
(R/C)
○
(only C)
16 Ys input Low : 0 – 0.4, High : 1 - 3V, 75Ω○ NC
17 GND(VIDEO output) ○○
18 GND(VIDEO input) ○○
19 VIDEO output 1VS-W(Negative going sync), 75Ω○
(TV)
○
(TV/LINE OUT)
20 VIDEO / Y input 1VS-W(Negative going sync), 75Ω○○
21 COMMON GND ○○
[
Pin assignment]

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
4
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. Don't short between the LIVE side ground and ISOLATED
(NEUTRAL) 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 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 will 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 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.
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
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.
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, video/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 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.).
z
zz
zAlternate 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 0.15PF
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 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.).
0.15
μ
F AC-TYPE
1500
:
10W
GOOD EARTH GROUND
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
AC VOLTMETER
(HAVING 1000
:
/V,
OR MORE SENSITIVITY)

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
5
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. It is possible to connect headphone.
10. Direct channel access.
11. APS (Automatic Programming System).
12. All programs can be named.
13. Forward or backward automatic tuning.
14. Automatic sound mute when no transmission.
15. 5 minutes after the broadcasting (closedown), the TV switches
itself automatically to stand-by mode.
MAIN DIFFERENCE LIST
MODEL No.
Parts Name
AV28BT7ENS
(Silver)
AV28BT7ENB
(Black)
AV28BT7EES
(Silver)
AV28BT7EEB
(Black)
AV28BT7EPS
(Silver)
AV28BT7EPB
(Black)
MAIN PWB VE-20073586 VE-20073447 VE-20081473
F CARTON BOX VE-20083462 VE-20083400 VE-20083464 VE-20083469 VE-20083471 VE-20083484
INST BOOK VE-20083463 VE-20083402 VE-20083466 VE-20083468 VE-20083470 VE-20083483
RATING LABEL VE-20083403 VE-20083401 VE-20083465 VE-20083467 VE-20083482 VE-20083485
FRONT CABINET VE-20082289 VE-20081489 VE-20082289 VE-20081489 VE-20082289 VE-20081489
BACK COVER VE-20082322 VE-20069017 VE-20082322 VE-20069017 VE-20082322 VE-20069017
TV RF system B/G B/G, D/K,K1 B/G,L/L’
TV PAL PAL / SECAM
Colour
system
VIDEO
PAL
NTSC 3.58
NTSC 4.43
PAL / SCAM
NTSC 3.58
NTSC 4.43

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
6
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Remove the
8screws marked A.
2. Withdraw the rear cover toward you.
REMOVING THE FRONT AV + HEADPHONE JACK
BOARD ASS’Y
zAfter removing the rear cover.
1. Remove the
2screws marked B, and remove the FRONT AV +
HEADPHONE JACK BOARD ASS’Y.
REMOVING THE FRONT CONTROL PWB
zAfter removing the rear cover.
1. Remove the MAIN PWB ASS’Y.
2. Remove the
5screws marked C
, and remove the FRONT
CONTROL PWB.
REMOVING THE SPEAKER
zAfter removing the rear cover.
1. Remove the
4screws marked D, and remove the SPEAKER.
2. Remove an opposite side similarly.
REMOVING THE MAIN PWB
zAfter removing the rear cover.
1. Draw out back and remove 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.

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
7
REAR COVER
SPEAKER
D
MAIN PWB
FRONT CABINET
FRONT AV +
HEADPHONE JACK
PWB
FRONT
CONTROL
PWB
B
C
D
SPEAKER
A
(×8)
(×4)
(×5)
(×2)
(×4)

No.51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
8
SETTING OF THE LAST MEMORY FOR SHIPMENT
■
■■
■USER SETTING VALUES
Setting Item Setting Value Setting Item Setting Value
SOUND MENU FEATURE MENU
BASS CENTER SLEEP TIMER OFF
TREBLE ↑CHILD LOCK OFF
BALANCE ↑
EFFECT OFF
PICTURE MENU INSTALL-> TV CONFIG. MENU
BRIGHTNESS LANGUAGE ENGLISH
COLOUR COUNTRY ?
CONTRAST AV-2 OUTPUT TV
SHARPNESS
HUE (only NTSC)
These adjust are automatically
restored when APS bit in Service
menu is set.
The procedure for setting APS
bit is described bellow.
PICTURE MODE AUTO
■
SETTING APS BIT IN SERVICE MENU
1) Enter service menu in TV mode by pressing “INFO” and “MUTING” keys simultaneously. Service Menu will appear.
2) Select OPTIONS by pressing Up/Down keys on remote control unit.
3) Enter OPTIONS by pressing Left/Right keys on remote control unit.
4) Select OPTION 8 by pressing Up/Down keys on remote control unit.
5) 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.

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
9
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 STANDARD
TINT/COLOR
PICTURE/BRIGHT
DETAIL
CENTER
ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltmeter)
2. Signal generator (Pattern generator)［PAL/SECAM/NTSC］
3. Remote control unit
MAIN PARTS LOCATIONS
IC501
MICOM
IC502
MEMORY IC
TUNER AV-1 AV-2
MULTI SOUND PWB
FBT
UPPER : FOCUS VR
LOWER : SCREEN VR
B1
(Indicated [150/115V]
on the bottom side)
VOL
（＋）
（＋）（＋）
（＋） （－）
（－）（－）
（－）
PROG
/Ch.
（＋）
（＋）（＋）
（＋） （－）
（－）（－）
（－）
MENU
LED REMOCON
RECEIVER
FRONT
TOP
FRONT
AUDIO.
VIDEO RL
HEADPHONE JACK
SCART
jack SCART jack

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
10
BASIC OPERATION SERVICE MENU
■
■■
■HOW TO ENTER THE SERVICE MODE
1) Press the
INFORMATION key and MUTING key of
REMOTE CONTROL UNIT simultaneously.
■
■■
■SELECTION OF ADJUSTMENT ITEMS
1) Press the
UP ( ) or DOWN ( ) key and select
the service menu item.
2) Press the
RIGHT ( ) or LEFT ( ) key and
enter ADJUSTMENT SCREEN.
3) Select the ADJUST No., use RIGHT ( ) /
LEFT ( )
key of remote control unit.
4) To change the selected parameter, use RIGHT ( )
and LEFT ( ) key.
■HOW TO EXIT SERVICE MODE
1) Press the STANDARD Key on REMOTE CONTROL UNIT.
■
■■
■ADJUSTMENT SERVICE MENU
ADJUSTMENT ITEM ADJUST
No. DISCRIPTION
00 White Point RED
01 White Point GREENWHITE BALANCE
02 White Point BLUE
AGC 03 AGC
IF-PLL NEGATIVE 04 IF-PLL Negative
IF-PLL POSITIVE 05 IF-PLL Positive
06 Y-Delay PAL
07 Y-Delay SECAMLUMINANCE DELAY
08 Y-Delay NTSC
10 4 : 3 PICTURE MODE
VERTICAL ZOOM 21 16 : 9 PICTURE MODE
11 4 : 3 PICTURE MODE
VERTICAL SCROLL 22 16 : 9 PICTURE MODE
12 4 : 3 PICTURE MODE
4 : 3 HORIZONTAL SHIFT 23 16 : 9 PICTURE MODE
13 4 : 3 PICTURE MODE
VERTICAL SLOPE 24 16 : 9 PICTURE MODE
14 4 : 3 PICTURE MODE
VERTICAL AMPLITUDE 25 16 : 9 PICTURE MODE
15 4 : 3 PICTURE MODE
S-CORRECTION 26 16 : 9 PICTURE MODE
16 4 : 3 PICTURE MODE
VERTICAL SHIFT 27 16 : 9 PICTURE MODE
17 4 : 3 PICTURE MODE
EW WIDTH 28 16 : 9 PICTURE MODE
18 4 : 3 PICTURE MODE
EW PARABOLA WIDTH 29 16 : 9 PICTURE MODE
19 4 : 3 PICTURE MODE
EW CORNER PARABOLA 30 16 : 9 PICTURE MODE
20 4 : 3 PICTURE MODE
EW TRAPEZIUM 31 16 : 9 PICTURE MODE
SERVICE
ADJUST…..
OPTIONS…..
SERVICE MENU SCREEN
ADJUST *** ******
***
OUT UP
ADJUSTMENT SCREEN
SERVICE
MENU ITEM
A
DJUST No.
PARAMETER
PARAMETER
VALUE
REMOTE CONTROL UNIT key NAME
MUTING key
UP / DOWN
(
/ ) key
INFORMATION
key
STANDARD key
RIGHT / LEFT
(
/ ) key

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
11
ADJUSTMENTS
Item Measuring
instrument Test point Adjustment part Description
SCREEN
VOLTAGE
Adjustment
Signal
Generator
Remote
Control
unit
SCREEN VR
[FBT]
OPTION 02
1. Receive a
PAL colour bar.
2. Enter the option settings in the SERVICE MENU.
3. Press the UP / DOWN ( ▲/▼) key, and Enter Option 02.
4. To change bit 6, come on to it by using L / R ( /) key 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 PW B is 150V DC.
SERVICE
ADJUST…..
OPTIONS…..
SERVICE MENU
SELECT OPTION menu
FOCOUS
SCREEN
FBT

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
12
Item Measuring
instruments Test point Adjustment part Description
WHITE
BALANCE
Signal
generator
ADJUST 00
(White point
- RED)
ADJUST 01
(White point
- GREEN)
ADJUST 02
(White point
- BLUE)
[LOW LIGHT]
1. Receive a whole black signal.
2. Adjust the <Adjust 00>, <Adjust 01>, <Adjust 02>, 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 <Adjust 00>, <Adjust 01>, <Adjust 02>, in the
SERVICE MENU so that the whiteness in the screen become
sharp.
AGC
Adjustment
DC
voltmeter
ADJUST 03 1. Receive a any broadcast.
2. Select
<ADJUST 03> from SERVICE MENU
3. Connect a DC voltmeter to pin 1 of the tuner. Change the
AGC parameter until you see 3.70V DC on voltmeter display.
IF-PLL
NEGATIVE
Adjustment
ADJUST 04 1. Select <ADJUST 04> from SERVICE MENU.
2. Adjustment value is set to 80 as a default value.
IF-PLL
POSITIVE
Adjustment
ADJUST 05 1. Select <ADJUST 05> from SERVICE MENU.
2. Adjustment value is set to 80 as a default value.

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
13
Item Measuring
instruments Test point Adjustment part Description
Adjust 06 [ Y-Delay PAL ]
1. Receive a
PAL colour bar signal.
2. Select
<Adjust 06> 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
<Adjust 07> 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.
LUMINANCE
DELAY
Adjustment
Signal
generator
Adjust 08 [ Y-Delay NTSC ]
1. Receive a
NTSC colour bar signal.
2. Select
<Adjust 08> 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. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
14
Item Measuring
instruments Test point Adjustment part Description
VERTICAL
ZOOM
Adjustment
Signal
generator
Adjust 10 ( 4 : 3 )
Adjust 21 ( 16 : 9 )
1. Receive a
PAL circle test pattern.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 10 > from SERVICE MENU.
4. 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. Receive a
PAL circle test pattern.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 11 > from SERVICE MENU.
4. 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.
4 : 3
HORIZONTAL
SHIFT
Adjustment
Signal
generator
Adjust 12 ( 4 : 3 )
Adjust 23 ( 16 : 9 )
1. Receive a
RED PURITY test pattern.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 12 > from SERVICE MENU.
4. 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.
VERTICAL
SLOPE
Adjustment
Signal
generator
Adjust 13 ( 4 : 3 )
Adjust 24 ( 16 : 9 )
1. Receive a
CROSS-HATCH signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 13 > from SERVICE MENU.
4. 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.
VERTICAL
AM PLIT UDE
Adjustment
Signal
generator
Adjust 14 ( 4 : 3 )
Adjust 25 ( 16 : 9 )
1. Receive a
PAL test pattern signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 14 > from SERVICE MENU.
4. 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.

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
15
Item Measuring
instrument Test point Adjustment part Description
S-CORRECTION
Adjustment
Signal
generator
Adjust 15 ( 4 : 3 )
Adjust 26 ( 16 : 9 )
1. Receive a
PAL circle pattern signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 15 > from SERVICE MENU.
4. 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.
VERTICAL
SHIFT
Adjustment
Signal
generator
Adjust 16 ( 4 : 3 )
Adjust 27 ( 16 : 9 )
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.
EW WIDTH
Adjustment
Signal
generator
Adjust 17 ( 4 : 3 )
Adjust 28 ( 16 : 9 )
1. Receive a
PAL test pattern signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 17 > from SERVICE MENU.
4. 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.
EW
PARABOLA
WIDTH
Adjustment
Signal
generator
Adjust 18 ( 4 : 3 )
Adjust 29 ( 16 : 9 )
1. Receive a
PAL test pattern signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 18 > from SERVICE MENU.
4. 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.
EW CORNER
PARABOLA
Adjustment
Signal
generator
Adjust 19 ( 4 : 3 )
Adjust 30 ( 16 : 9 )
1. Receive a
PAL test pattern signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 19 > from SERVICE MENU.
4. 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.

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
16
Item Measuring
instrument Test point Adjustment part Description
EW
TRAPEZIUM
Adjustment
Signal
generator
Adjust 20 ( 4 : 3 )
Adjust 31 ( 16 : 9 )
1. Receive a
PAL circle pattern signal.
2. Set
< 4 : 3 aspect mode >.
3. Select
< ADJUST 20 > from SERVICE MENU.
4. 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.

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
17
PARTS LIST
CONTENTS
USING PW BOARD & REMOTE CONTROL UNIT ･･････････････････････････････････････････････････････17
EXPLODED VIEW PARTS LIST ･･････････････････････････････････････････････････････････････････････････18
EXPLODED VIEW ････････････････････････････････････････････････････････････････････････････････････････19
PRINTED WIRING BOARD PARTS LIST
zMAIN PW BOARD ASS'Y ･･････････････････････････････････････････････････････････････････････････････････････20
zMULTI SOUND PW BOARD ASS’Y ･････････････････････････････････････････････････････････････････････････････25
zCRT SOCKET PW BOARD ASS'Y ･･････････････････････････････････････････････････････････････････････････････26
zFRONT CONTROL PW BOARD ASS’Y ･･････････････････････････････････････････････････････････････････････････26
zFRONT AV + HEADPHONE JACK PW BOARD ASS’Y･････････････････････････････････････････････････････････････26
zPROTECTION MODULE PW BOARD ASS’Y ･････････････････････････････････････････････････････････････････････26
zT(SPOT KILLER) MODULE PW BOARD ASS’Y･･･････････････････････････････････････････････････････････････････26
zMAIN PW BOARD ASS'Y ･･････････････････････････････････････････････････････････････････････････････････････27
zMAIN PW BOARD ASS'Y ･･････････････････････････････････････････････････････････････････････････････････････32
zMULTI SOUND PW BOARD ASS’Y ･････････････････････････････････････････････････････････････････････････････37
PACKING / PACKING PARTS LIST ･･････････････････････････････････････････････････････････････････････39
USING PW BOARD & REMOTE CONTROL UNIT
Model
PWB ASS'Y
AV28BT7ENS
AV28BT7ENB
AV28BT7EES
AV28BT7EEB
AV28BT7EPS
AV28BT7EPB
MAIN PWB VE-20073586 VE-20073447 VE-20071473
MULTI SOUND PWB VE-20078991 VE-20079020
CRT SOCKET PWB VE-20074437
FRONT CONTROL PWB VE-20001612
FRONT AV + HEADPHONE
JACK PWB VE-20083646
PROTECTION MODULE PWB VE-20058569
T(SPOT KILLER) MODELE PWB VE-20019598
REMOTE CONTROL UNIT RM-C85
[ AV28BT7EPS / AV28BT7EPB]
[ AV28BT7ENS / AV28BT7ENB]
[ AV28BT7EES / AV28BT7EEB]

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
18
EXPLODED VIEW PARTS LIST

5HI1R 3DUW1R 3DUW1DPH 'HVFULSWLRQ


9 9( 3,&785(78%(,7&
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 9( 32:(5.12%
 9( 635,1*
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 9( )5217&$%,1(7
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 9( )5217$9'225
 9( 3,1)5217$9'225 ;
 9( (-(&725
 9( /(16/('
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 9( $'-867$%/(%266&57 ;
 9( 6&5(: ;

 9( %$6(
 9( 6+$66,6)5$0(

 9( %$&.&29(5
 9( 6&5(: ;


5HI1R 3DUW1R 3DUW1DPH 'HVFULSWLRQ


9 9( 3,&785(78%(,7&
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 9( 32:(5.12%
 9( 635,1*

 9( )52173$1(/
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 9( )5217&$%,1(7
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 9( %87721$66·<
 9( )5217$9'225
 9( 3,1)5217$9'225 ;
 9( (-(&725
 9( /(16/('
 9( /(1635($03
 9( 63($.(5 ;
 9( $'-867$%/(%266&57 ;
 9( 6&5(: ;
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 9( %$6(
 9( 6+$66,6)5$0(

 9( %$&.&29(5
 9( 6&5(: ;
 
[ SILVER model : AV28BT7ENS, AV28BT7EES, AV28BT7EPS]
[ BLACK model : AV28BT7ENB, AV28BT7EEB, AV28BT7EPB ]

No. 51883
A
V28BT7ENS / AV28BT7ENB
A
V28BT7EES / AV28BT7EEB
A
V28BT7EPS / AV28BT7EPB
19
EXPLODED VIEW

MAIN PWB
V01
17
5
11
11


FRONT AV +
HEADPHONE JACK
PWB
FRONT
CONTROL
PWB
6
3
1
2
4
7
8
9
10
12
13
14
15




16
13
12

No. 51883
A
V28BT7ENS / AV28BT7ENB
20
PRINTED WIRING BOARD PARTS LIST
MAIN P.W. BOARD ASS’Y (VE-20073586)
6\PERO1R 3DUW1R 3DUW1DPH 'HVFULSWLRQ
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5(6,6725
5 9( &)5(6 :.-
5 9( 60'5(6 :.-
5 9( &)5(6 :.-
5 9( 60'5(6 :.-
5 9( &)5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( &)5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( &)5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
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5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
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5 9( 60'5(6 :.-
5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( &)5(6 :.-
5 9( 60'5(6 :5-
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5 9( &)5(6 :.-
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5 9( 60'5(6 :5-
5 9( &)5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :5-
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5 9( &)5(6 :5-
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5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( &)5(6 :5-
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5 9( 60'5(6 :.-
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5 9( 60'5(6 :5-
5 9( 60'5(6 :5-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( &)5(6 :.-
5 9( &)5(6 :.-
5 9( &)5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-
5 9( 60'5(6 :.-

[ AV28BT7ENS / AV28BT7ENB ]