JVC AV28WT5EPS User manual

No.51776
AV28WT5EPS AV24WT5EPS
AV28WT5EIS AV24WT5EIS
AV28WT5EKS AV24WT5EKS
1COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD. Jan. 2001
AV28WT5EPS AV24WT5EPS
AV28WT5EIS AV24WT5EIS
AV28WT5EKS AV24WT5EKS
CONTENTS
!SPECIFICATIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ･
･･
･2
!SAFETY PRECAUTIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ･･･････････････････････････
･･････････････････････････････････････････････････････
･･･････････････････････････4
!WARNING････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････
････････････････
････････5
!FEATURES････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ･･･････
･･････････････
･･･････7
!MAIN DIFFERENCE PARTS LIST････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････････････････
････････････････････････････････････････
････････････････････9
!SPECIFIC SERVICE INSTRUCTIONS････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ･･･････････････
･･････････････････････････････
･･･････････････ 10
!SERVICE ADJUSTMENTS････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････････････････････
････････････････････････････････････････････････
････････････････････････ 17
!PARTS LIST････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ････
････････
････ 39
★
OPERATING INSTRUCTIONS････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ･････････････････････
･･････････････････････････････････････････
･････････････････････ 1-1
★
STANDARD CIRCUIT DIAGRAM ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････ ･･････････････････
････････････････････････････････････
･･････････････････ 2-1
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
JKⅡ
ⅡⅡ
Ⅱ

No.51776
A
V28WT5EPS
A
V28WT5EIS
A
V28WT5EKS
2
SPECIFICATIONS
Content
Item AV28WT5EPS AV28WT5EIS AV28WT5EKS
Dimensions ( W×
××
×H×
××
×D ) 716mm×489mm×496mm
Mass 34.2kg
TV RF System CCIR (B/G, I ,L) CCIR (I ) CCIR ( I )
Colour System PAL / SECAM /
NTSC (Only in EXT mode) PAL / NTSC (Only in EXT mode) PAL / NTSC (Only in EXT mode)
Stereo System A2 / NICAM NICAM NICAM
Teletext System FLOF (Fastext)
TOP (German system)
WST(Standard system)
FLOF (Fastext)
WST(Standard system)
Receiving Frequency
VHF 47MHz ～470MHz 47MHz ～470MHz
UHF 470MHz ～862MHz 470MHz ～862MHz 470MHz ～862MHz
French CATV 116MHz ～172MHz /
220MHz ～469MHz
Intermediate Frequency
VIF Carrier 38.9MHz (B/G, I ,L)/ 33.95MHz (L’) 38.9MHz ( I ) 38.9MHz ( I )
SIF Carrier 33.4MHz (5.5MHz:B/G) / 32.9MHz
(6.0MHz:I) / 32.4MHz (6.5MHz:L) /
27.45MHz (6.5MHz:L’)
32.9MHz (6.0MHz:I) 32.9MHz (6.0MHz:I)
Colour Sub Carrier Freq.
PAL 4.43MHz 4.43MHz 4.43MHz
SECAM 4.40625MHz / 4.25MHz
NTSC 3.58MHz / 4.43MHz 3.58MHz / 4.43MHz 3.58MHz / 4.43MHz
Power Input AC 220V～240V , 50Hz
Power Consumption 156W(Max) / 122W(Avg),
122W/h(ITALY)
Aerial Input Term 75Ωunbalanced, Coaxial
Picture Tube Visible size : 66cm, Measured
diagonally
High Voltage 30.0kV (at zero beam
current)
Speaker 10cm×3cm Oval type×2
Audio Output 5W + 5W
EXT-1/EXT-2/EXT-3
(Input / Output) 21-pin Euro connector
(SCART socket)
EXT-4 (Input) Video
Audio(L/R)
S / Video
1Vp-p 75Ω(RCA pin jack)
500mVrms(!-4dBs!), High
Impedance (!RCA pin jack!)
Y : 1Vp-p POSITIVE (Negative
sync Provided, when terminated
with 75Ω)
C : 0.286Vp-p (Burst signal, when
terminated with 75Ω)
AUDIO OUT (Variable) 0～1Vrms, Low Impedance
(RCA pin jack×2)
Headphone jack Stereo mini jack (φ3.5mm )
Remote Control Unit RM-C54 (AAA/R03 dry battery×2) RM-C55 (AAA/R03 dry battery×2)
Design & specifications are subject to change without notice.
+1kV
-1.5kV
(28” Model)

No.51776
A
V24WT5EPS
A
V24WT5EIS
A
V24WT5EKS
3
SPECIFICATIONS
Content
Item AV24WT5EPS AV24WT5EIS AV24WT5EKS
Dimensions ( W×
××
×H×
××
×D ) 645mm×427mm×443mm
Mass 23.1kg
TV RF System CCIR (B/G, I ,L) CCIR ( I )
Colour System PAL / SECAM /
NTSC (Only in EXT mode) PAL /
NTSC (Only in EXT mode)
Stereo System A2 / NICAM NICAM
Teletext System FLOF (Fastext)
TOP (German system)
WST(Standard system)
FLOF (Fastext)
WST(Standard system)
Receiving Frequency
VHF 47MHz ～470MHz 47MHz ～470MHz
UHF 470MHz ～862MHz 470MHz ～862MHz 470MHz ～862MHz
French CATV 116MHz ～172MHz /
220MHz ～469MHz
Intermediate Frequency
VIF Carrier 38.9MHz (B/G, I ,L) /
33.95MHz (L’) 38.9MHz ( I )
SIF Carrier 33.4MHz (5.5MHz:B/G) / 32.9MHz
(6.0MHz:I) /32.4MHz (6.5MHz:L) /
27.45MHz (6.5MHz:L’)
32.9MHz (6.0MHz:I)
Colour Sub Carrier Freq.
PAL 4.43MHz 4.43MHz
SECAM 4.40625MHz / 4.25MHz
NTSC 3.58MHz / 4.43MHz 3.58MHz / 4.43MHz
Power Input AC 220V～240V , 50Hz
127W(Max) / 92W(Avg)
Power Consumption
92W/h(ITALY)
Aerial Input Term 75Ωunbalanced, Coaxial
Picture Tube Visible size : 56cm, Measured
diagonally
High Voltage 30.0kV (at zero beam
current)
Speaker 10cm×3cm Oval type×2
Audio Output 5W + 5W
EXT-1/EXT-2/EXT-3
(Input / Output) 21-pin Euro connector
(SCART socket)
EXT-4 (Input) Video
Audio(L/R)
S / Video
1Vp-p 75Ω(RCA pin jack)
500mVrms(!-4dBs!), High
Impedance (!RCA pin jack!)
Y : 1Vp-p POSITIVE (Negative
sync Provided, when terminated
with 75Ω)
C : 0.286Vp-p (Burst signal, when
terminated with 75Ω)
AUDIO OUT 0～1Vrms, Low Impedance
(RCA pin jack)
Headphone jack Stereo mini jack (φ3.5mm )
Remote Control Unit RM-C54 (AAA/R03 dry battery×2) RM-C55 (AAA/R03 dry battery×2)
Design & specifications are subject to change without notice
+1kV
-1.5kV
(24” Model)

No.51776
A
V28WT5EPS AV24WT5EPS
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.).
"
""
"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 0.15#F
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)
AV28WT5EPS / AV24WT5EPS

No.51776
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
5
SAFETY PRECAUTIONS
1. The design of this product contains special hardware and 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 product 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. The leads in the products are routed and dressed with ties,
clamps, tubing’s, barriers and the like to be separated from live
parts, high temperature parts, moving parts and / or sharp edges
for the prevention of electric shock and fire hazard. When
service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been
returned to normal, after re-assembling.
WARNING
1. The equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
AV28WT5EIS / AV24WT5EIS
AV28WT5EKS / AV24WT5EKS

No.51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
6
■
■■
■21-pin Euro connector (SCART socket) : EXT-1 / EXT-2 / EXT-3
(P-P= Peak to Peak, S-W= Sync tip to white peak, B-W= Blanking to white peak)
Pin
No. Signal Designation Matching Value EXT-1 EXT-2 EXT-3
1 AUDIO R output 500mVrms(Nominal),
Low impedance ○
(TV OUT)
○
(LINE OUT) NC
2 AUDIO R input 500mVrms(Nominal),
High impedance ○○○
3 AUDIO L output 500mVrms(Nominal),
Low impedance ○
(TV OUT)
○
(LINE OUT) NC
4 AUDIO GND ○○○
5 GND (B) ○○○
6 AUDIO L input 500mVrms(Nominal),
High impedance ○○○
7 B input 700mVB-W, 75Ω○
NC NC
8 FUNCTON SW
(SLOW SW) Low : 0-3V, High : 8-12V, High
impedance ○○○
9 GND (G) ○○○
10 SCL3 NC ○NC
11 G input 700mVB-W, 75Ω○
NC NC
12 SDA3 NC ○NC
13 GND (R) ○○○
14 GND (YS)○NC NC
15 R / C input R : 700mVB-W, 75Ω
C : 300mVP-P, 75Ω
○
(only R)
○
(only C)
○
(only C)
16 Ys input Low : 0 - 0.4, High : 1 - 3V, 75Ω○ NC NC
17 GND(VIDEO output) ○○○
18 GND(VIDEO input) ○○○
19 VIDEO output 1VP-P(Negative going sync), 75Ω○
(TV)
○
(LINE OUT) NC
20 VIDEO / Y input 1VP-P(Negative going sync), 75Ω○ ○ ○
21 COMMON GND ○○○
[
Pin assignment]

No.51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
7
FEATURES
"By preference, users can select the picture size from REGULAR,
PANORAMIC, FULL, 14:9 ZOOM, 16:9 ZOOM, 16:9 ZOOM SUB
TITLE modes. When the TV unit received WSS picture signal, the
picture can be changed to 16:9 ZOOM mode automatically.
"The TELETEXT SYSTEM has a built-in FASTEXT, TOP(Only
AV28WT5EPS / AV24WT5EPS) and WST system.
"Because this TV unit corresponds to multiplex broadcast, users
can enjoy music programs and sporting events with live realism.
In addition, BILINGUAL programs can be heard in their original
language.
"Built-in ECO (ECONOMY, ECOLOGY) MODE.
In accordance with the brightness in a room, the brightness
and/or contrast of the picture can be adjusted automatically to
make the optimum picture which is easy on the eye.
"Users can make VCR dubbing of picture and sound by controlling
the AV selector to select an optional source at the EXT-2 output
shown in figure.
TV EXT-1 EXT-3
EXT-2
EXT-4

No.51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
8
MAIN DIFFERENCE PARTS LIST
!
!!
!
Model Name
Part Name AV28WT5EPS AV28WT5EIS AV28WT5EKS
MAIN PWB SJK-1712A-U2 ←SJK-1912A-U2
AV SEL. PWB SJK0S712A-U2 ←SJK0S912A-U2
!POWER CORD QMPK160-185-JC QMPN130-185-JC ←
!RATING LABEL LC20433-008A-U
LC20434-008A-U LC20080-015A-U LC20091-023A-U
EURO LABEL AEM1052-031-E AEM1052-030-E AEM1052-029-E
!INST BOOK LCT0897-001A-U
LCT0898-001A-U LCT0900-001A-U LCT0899-001A-U
REMOTE CONTROL
UNIT RM-C54-1C RM-C55-1C ←
X-RAY CARD AEM1061-001-E ××
S. DIAGRAM
ONLY ITALY(SERVICE) 2824WT5-HSAEI ××
REG. SHEET ×× AEM3148-001-E
!
!!
!
Model Name
Part Name AV24WT5EPS AV24WT5EIS AV24WT5EKS
MAIN PWB SJK-1713A-U2 ←SJK-1913A-U2
AV SEL. PWB SJK0S713A-U2 ←SJK0S913A-U2
!POWER CORD QMPK160-185-JC QMPN130-185-JC ←
!RATING LABEL LC20433-007A-U
LC20434-007A-U LC20080-014A-U LC20091-022A-U
EURO LABEL AEM1052-027-E AEM1052-025-E AEM1052-026-E
!INST BOOK LCT0897-001A-U
LCT0898-001A-U LCT0900-001A-U LCT0899-001A-U
REMOTE CONTROL
UNIT RM-C54-1C RM-C55-1C ←
X-RAY CARD AEM1060-001-E ××
S. DIAGRAM
ONLY ITALY(SERVICE) 2824WT5-HSAEI ××
REG. SHEET ×× AEM3148-001-E
(28” Model)
(24” Model)

No.51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
9
SPECIFIC SERVICE INSTRUCTIONS
REPLACEMENT OF CHIP COMPONENT
!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.
!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) Shift with tweezers and remove the chip part.
#
##
#Transistors, diodes, variable resistors, etc
(1) Apply extra solder to each lead.
(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.
2. How to install Chip parts
#
##
#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
Aas indicated in the figure.
(4) Then solder leads
Band C.
SOLDER SOLDER
AB
C
A
B
C

No.51776
A
V28WT5EPS
A
V28WT5EIS
A
V28WT5EKS
10
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the power cord.
2. Remove the 13 screws marked“A
AA
A”as shown in the Fig. 1.
3. Withdraw the rear cover toward you.
REMOVING THE CHASSIS
"After removing the rear cover.
1. Remove the screw marked “B
BB
B”on the S/VIDEO terminal of
FRONT CABINET as shown in the Fig. 1.
2. Slightly raise the both sides of the chassis by hand and remove
the two claws under the both sides of the chassis from the front
cabinet.
3. Withdraw the chassis backward.
(If necessary, take off the wire clamp, connectors etc.)
REMOVING THE AV TERMINAL BOARD
"After removing the rear cover.
1. Remove the 2 screws marked“C
CC
C”as shown in the Fig. 1.
2. Remove the claws marked “D
DD
D”under the CHASSIS as
shown in Fig. 2.
3. While raising the claw marked “E
EE
E”
, remove the top of the AV
TERMINAL BOARD slightly in the direction of arrow“F
FF
F”as
shown in Fig. 2.
REMOVING THE SPEAKER
"After removing the rear cover.
1. Remove the 2 screws marked“G
GG
G”as shown in Fig. 1.
2. Follow the same steps when removing the other hand speaker.
CHECKING THE PW BOARD
To check the back side of the PW Board.
1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).
2) Erect the chassis vertically 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 PW board.
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.
Fig. 2
A
V SEL PWB
A
V TERMINAL
BOARD
D
D
F
E
(28” Model)

No.51776
A
V28WT5EPS
A
V28WT5EIS
A
V28WT5EKS
11
FRONT CABINET
CRT
SOCKET
PWB
FRONT CONTROL
PWB
POWER & DEF. PWB
CLAW
CLAW
MAIN PWB
CONTROL BASE
CHASSIS
REAR COVER
Fig. 1
A
V TERMINAL
BOARD
SPEAKER
A
V SEL. PWB
B
C
B
(28” Model)

No.51776
A
V24WT5EPS
A
V24WT5EIS
A
V24WT5EKS
12
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the power cord.
2. Remove the 9 screws marked“A
AA
A”as shown in the Fig. 3.
3. Withdraw the rear cover toward you.
REMOVING THE CHASSIS
"After removing the rear cover.
1. Slightly raise the both sides of the chassis by hand and remove
the two claws under the both sides of the chassis from the front
cabinet.
2. Withdraw the chassis backward.
(If necessary, take off the wire clamp, connectors etc.)
REMOVING THE AV TERMINAL BOARD
"After removing the rear cover.
1. Remove the 2 screws marked“B
BB
B”as shown in the Fig. 3.
2. Remove the claws marked “C
CC
C”under the CHASSIS as
shown in Fig. 4.
3. While raising the claw marked “D
DD
D”
, remove the top of the AV
TERMINAL BOARD slightly in the direction of arrow“E
EE
E”as
shown in Fig. 4.
REMOVING THE SPEAKER
"After removing the rear cover.
1. Remove the 2 screws marked“F
FF
F”as shown in Fig. 3.
2. Follow the same steps when removing the other hand speaker.
CHECKING THE PW BOARD
"To check the back side of the PW Board.
1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).
2) Erect the chassis vertically 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 PW board.
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.
Fig. 4
A
V SEL. PWB
A
V TERMINAL
BOARD
C
C
ED
(24” Model)

No.51776
A
V24WT5EPS
A
V24WT5EIS
A
V24WT5EKS
13
FRONT CABINET
CRT
SOCKET
PWB
FRONT CONTROL
PWB
POWER & DEF. PWB
CLAW
CLAW
MAIN PWB
CHASSIS
REAR COVER
Fig. 3
A
V TERMINAL
BOARD
SPEAKER
A
V SEL. PWB
C
B
(24” Model)

No. 51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
14
REMOVING THE CRT
$Replacement of the CRT should be performed by 2 or more
persons.
%After removing the 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.5).
2. While keeping the surface of CRT down, mount the TV set on the
CRT change table balanced will as shown in Fig.6.
3. Remove 4 screws marked by arrows with a box type screw driver
as shown in Fig.6.
%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.7.
%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.
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.8.
Wipe around the anode button with clean and dry cloth. (Fig.8)
Coat silicon grease on the section around the anode button. At
this time, take care so that any silicon greases dose not stick to
the anode button. (Fig.9)
★
★★
★Silicon grease product No. KS - 650N
CRT CHANGE TABLE
CLOTH
A
PPROX.
35cm
CRT
CRT
CHANGE
TABLE BOX
TYPE
SCREW
DRIVER
Fig. 5
Fig. 8 Fig. 9
A
pprox.
20mm (Do not
coat grease on
this section
Silicon grease
should be coated
by 5mm or more
from the outside
diameter of
anode cap.
A
node button
(No sticking of
silicon grease) Coating position
of silicon grease
A
node cap
A
node button
CRT
Silicon grease
coating
Fig. 7
CRT
CABINET CRT
CHANGE TABLE
Fig. 6

No. 51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
15
REPLACEMENT OF MEMORY ICs
1. Memory ICs
This TV use memory ICs. In the memory ICs, there are memorized data
for correctly operating the video and deflection circuits. When replacing
memory ICs, be sure to use ICs written with the initial values of data.
2. Procedure for replacing memory ICs
PROCEDURE
(1) Power off
Switch the power off and unplug the power cord from the outlet.
(2) Replace ICs.
Be sure to use memory ICs written with the initial data values.
(3) Power on
Plug the power cord into the outlet and switch the power on.
(4) Check and set SYSTEM CONSTANT SET:
*
**
* It must not adjust without signal.
1) Press the INFORMATION key and the MUTING key of the
REMOTE CONTROL UNIT simultaneously.
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) While the SERVICE MENU is displayed, press the
INFORMATION key and MUTING key simultaneously, and the
SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.
4) Check the setting values of the SYSTEM CONSTANT SET of
Table 1. If the value is different, select the setting item with the
FUNCTION UP/DOWN key, and set the correct value with the
FUNCTION -/+ key.
5) Press the MENU key to memorize the setting value.
6) Press the INFORMATION key twice, and return to the normal
screen.
(5) Setting of receive channels
Set the receive channel.
For setting, refer to the OPERATING INSTRUCTIONS.
(6) User settings
Check the user setting values of Table 2, and if setting value is
different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.
(7) Setting of SERVICE MENU
Verify the setting items of the SERVICE MENU of Table 3, and reset
where necessary.
For setting, refer to the SERVICE ADJUSTMENTS.
Names of key
i
ii
i
▼
▼
▼
▼
INFORMATION
MUTING
FUNCTION UP/DOWN
MENU
FUNCTION -/+
key
OK
NAME OF REMOTE CONTROL KEY
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7 : SELECT : EXIT
Fig.1
SYSTEM CONSTANT SET
MODEL=JK_EURO (V*.****)
JVC JK-II EURO V00
COUNTRY : **
INCH : **
MODEL : WT
- + : STORE : EXIT
******** - *****
OK
Fig.2

No. 51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
16
SETTING VALUES OF SYSTEM CONSTANT SET (TABLE 1)
Setting value
AV28WT5EPS AV28WT5EIS AV28WT5EKS
Setting item Setting content
AV24WT5EPS AV24WT5EIS AV24WT5EKS
COUNTRY EP IR EK
28 28 28
INCH 24 24 24
MODEL WT
USER SETTING VALUES (TABLE 2)
PICTURE SETTING EXT SETTING
TINT
CONTRAST
BRIGHT
SHARP
COLOUR
ECO MODE
COOL
OFF
ID
S-IN
DUBBING
BLANK
BLANK
EXT-1→EXT-2
PICTURE FEATURES FEATURES
AUTO VNR
COLOUR SYSTEM
4:3 AUTO ASPECT
AUTO
TV : According to preset CH
EXT : AUTO
PANORAMIC
SLEEP TIMER
BLUE BACK
CHILD LOCK
DECODER (EXT-2)
OFF
ON
ID : No.****
ALL CH OFF
OFF
SOUND SETTING INSTALL
LANGUAGE
EDIT/MANUAL
ENGLISH
PRESET CH only
The others : BLANK
STEREO / Ⅰ･Ⅱ
BASS
TREBLE
BALANCE
HYPER SOUND
+3
OFF
DEMO OFF
SERVICE MENU SETING ITEMS (TABLE 3)
Setting item Setting value Setting item Setting value
1. IF VCO 4. DEF. 1. V-SHIFT
2. V-SIZE
3. SUBTITLE
4. H-CENT
5. H-SIZE
6. EW-PIN
7. TRAPEZ
8. EW. COR. L
9. EW. COR. H
10. V. S-COR
11. V- LIN
12. H-BLK-R
13. H-BLK-L
14. V-EHT
15. H-EHT
16. EHT-GAIN
2. V / C 1. CUT OFF
2. DRIVE
3. BRIGHT
4. CONT.
5. COLOUR
6. HUE
7. BLACK OFFSET (Only SECAM)
8. SHARP
9. PURITY
5. VSM PRESET
COOL
NORMAL
WARM
1. BRIGHT
2. CONT.
3. COLOUR
4. SHARP
5. HUE
6. R DRIVE
7. B DRIVE
6. VPS
(Do not adjust) VPS
PDC
1. AUDIO
(Do not adjust) 1. CONC LIMIT
2. A2 ID THR
3. ALC
4. BASS
5. TREBLE 7. AUTO PROGRAM
(Do not adjust) ON / OFF
REFER to VSM PRESET
EN
EK EP
EEIR
WR
WT
32
24 28
CENTER

No. 51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
17
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
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 setting (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 to AC power
source.
4. Turn on the power of the TV and measuring instrument for
warming up for at least 30 minutes before starting adjustment.
5. If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
6. Never touch parts (such as variable resistors, transformers and
condensers) not shown in the adjustment items of this service
adjustment.
7. Preparation for adjustment (presetting):
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT:
"Setting position
PICTURE MODE (VSM) NORMAL
SLEEP TIMER OFF
BALANCE CENTER
ECO OFF
ZOOM PANORAMIC
MEASURING INSTRUMENT AND FIXTURES
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL / SECAM / NTSC]
4. Remote control unit
ADJUSTMENT ITEMS
●B1 power supply check.
●Adjustment of FOCUS.
●IF circuit adjustment.
●VSM preset adjust setting.
●VIDEO / CHROMA circuit adjustment.
●DEFLECTION circuit adjustment.
●H. BLANKING ADJUSTMENT.
●AUDIO circuit adjustment. (Do not adjust)

No. 51776
A
V28WT5EPS
A
V28WT5EIS
A
V28WT5EKS
18
ADJUSTMENT LOCATIONS (1)
E1
TP-47R
CN009
CN008
TP-E
CRT SOCKET PWB
(SOLDER SIDE)
TOP
FRONT
MAIN PWB POWER&DEF PWB
FRONT
CN006
AV SEL PWB
TUNER
CN001 IC701
IC702
MEMORY
WDEG
1pin:B1(TP-91)
2pin:NC
3pin:NC
4pin:NC
5pin:GND
5
1
X
FRONT CONTROL PWB (1)
(AV28WT5EPS/EIS/EKS)
FRONT
HV
SCREEN
FOCUS
TP-47G
TP-47B
CN009
L
IC301 CN008
CN001
SP R
PW
F901
POWER SW
SP L
(28” Model)

No. 51776
A
V24WT5EPS
A
V24WT5EIS
A
V24WT5EKS
19
ADJUSTMENT LOCATIONS (2)
(24” Model)
E1
TP-47R
CN009
CN008
TP-E
CRT SOCKET PWB
(SOLDER SIDE)
TOP
FRONT
MAIN PWB POWER&DEF PWB
FRONT
CN006
AV SEL PWB
TUNER
CN001 IC701
IC702
MEMORY
WDEG
1pin:B1(TP-91)
2pin:NC
3pin:NC
4pin:NC
5pin:GND
5
1
X
FRONT CONTROL PWB (1)
(AV24WT5EPS/EIS/EKS)
FRONT
HV
SCREEN
FOCUS
TP-47G
TP-47B
CN009
L
IC301 CN008
CN001
SP R
PW
F901
SP L
POWER SW

No. 51776
A
V28WT5EPS AV24WT5EPS
A
V28WT5EIS AV24WT5EIS
A
V28WT5EKS AV24WT5EKS
20
BASIC OPERATION SERVICE MENU
1. TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
2. SERVICE MENU ITEMS
With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings
(adjustments):
(1) 1. IF･･･････････････････････ This mode adjusts the setting values of the IF circuit.
(2) 2.V/C･･････････････････････ This mode adjusts the setting values of the VIDEO / CHROMA circuit.
(3) 3.AUDIO･･･････････････････ This mode adjusts the setting values of the multiplicity SOUND circuit.
(4) 4.DEF ･････････････････････ This mode adjusts the setting values of the DEFLECTION circuit for each aspect mode given below.
REGULAR (50/60Hz)
PANORAMIC (50/60Hz)
14:9 ZOOM (50/60Hz)
16:9 ZOOM (50/60Hz)
SUB TITLE (50/60Hz)
FULL (50/60Hz)
(5) 5.VSM PRESET ････････････ This mode adjusts the initial setting values of COOL,NOMAL and WARM.
(VSM : Video Status Memory)
(6) 6.VPS ･････････････････････ This mode shows the monitor of the VPS and PDC.(Do not adjust).
(VPS : Video Program System, PDC : Program Delivery Code)
(7) 7.AUTO PROGRAM･････････ By turning the power switch on, you can get the state of AUTO PROGRAM. (Do not adjust)
3. BASIC OPERATION OF SERVICE MENU
(1) How to enter SERVICE MENU
Press the INFORMATION key and the MUTING key of the
REMOTE CONTROL UNIT simultaneously, and the
SERVICE MENU screen of Fig. 1 will be displayed.
(2) Selection of SUB MENU SCREEN
Press one of keys 1～7 of the REMOTE CONTROL UNIT
and select the SUB MENU SCREEN (See Fig. 3), form the
SERVICE MENU.
SERVICE MENU →SUB MENU
1. IF
2. V / C
3. AUDIO
4. DEF.
5. VSM PRESET
6. VPS
7. AUTO PROGRAM
Names of key
i
ii
i
▼
▼
▼
▼
INFORMATION
MUTING
FUNCTION UP/DOWN
MENU
FUNCTION -/+
key
OK
SERVICE MENU
NEME OF REMOTE CONTOROL KEY
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7 : SELECT : EXIT
Fig.1
Fig.2