JVC AV-28WFT1EPG User manual

AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
JVC
_ SERVICE MANUAL
N Wn
BASIC CHASSIS
AV-28WFT1EPG AV-32WFT1EPG
AV-28WFT1EPS AV-32WFT1EPS
AV-28WFT1EIS AV-32WFT1EKS
AV-28WFT1EKS
AV-28WFT1EK
CONTENTS
M SPECIFICATIONS «+ sect etter eee eee eee eee eee eee 2
M SAFETY PRECAUTIONS «cect c tcc t treet rete eee e ene pee e nee ene nena 5
M FEATURES: ccc c etter ence eee eee eee eee eee eee eee eee eee e tenes 7
M MAIN DIFFERENCE PARTS LIST- «+s tcc tc cette teen e nen cree enna 8
PU) \ e400) ee - 10
@ SPECIFIC SERVICE INSTRUCTIONS «eer etr etter terete terrence ee teen eenneee 11
@ SERVICE ADJUSTMENTS «sccrt tte t terete eee ee tenner eee e eens 16
% STANDARD CIRCUIT DIAGRAM «sere c tert t terete tenet eee eee eee e eee eens 2-1
M PARTS LIST cc ccc tcc rece eee e eens eee e eee e anne ee eee ea nesses enees - 37
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
F322
No.51694
Feb. 2000

AV-28WFT1EPG AV-28WFTI1EIS
AV-28WFT1EPS
AV-28WFT1EKS
AV-28WFT1EK
SPECIFICATIONS
Content
AV-28WFT1EPG/AV-28WFTIEPS | AV-28WFT1EK/AV-28WFT1EKS AV-28WFT1EIS
Dimensions (WxHxD) | 780mm x 509mm x 499mm <_—— <+_—
Mass 39.0kg <+—_—_- <—_——-
) )
TV RF System CCIR (B/G, | JL CCIR (1) CCIR (I
PAL / SECAM / PAL / NTSC (Only in EXT mode) PAL / NTSC (Only in EXT mode)
NTSC (Only in EXT mode)
Stereo System A2/NICAM NICAM NICAM
Fastext (United Kingdom system) Fastext (United Kingdom system)
TOP (German system) WST(Standard system)
WST(Standard system)
Colour System
Teletext System
Receiving Frequency
VHF
UHF
French CA TV
47MHz ~ 470MHz
470MHz ~ 862MHz
47MHz ~ 470MHz
470MHz ~ 862MHz
116MHz ~ 172MHz/
220MHz ~ 469MHz
470MHz ~ 862MHz
Intermediate Frequency
VIF Carrier
SIF Carrier
38.9MHz (1)
32.9MHz (6.0MHz:1)
38.9MHz (1)
32.9MHz (6.0MHz:1)
38.9MHz (B/G, | ,L)/ 33.95MHz (L’)
33.4MHz (5.5MHz:B/G) / 32.9MHz
(6.0MHz:l) / 32.4MHz (6.5MHz:L) /
27.45MHz (6.5MHz:L’)
Colour Sub Carrier Freq.
PAL
SECAM
NTSC
4.43MHz 4.43MHz 4.43MHz
4.40625MHz / 4.25MHz
3.58MHz / 4.43MHz
AC 220V~240V , 50Hz
168W (Max) / 115W (Avg),
31.0Kv ~
current) ~
115W/h(ITALY)
+
) |
Speaker
_
16
x
4cm
Oval
Type
x
2
;
Audio Output 7.5W +7.5W
La
=;
|
fewot 2 ea tel
3.58MHz / 4.43MHz 3.58MHz / 4.43MHz
Power Input
Power Consumption
Aerial Input Term
Visible size : 66cm, Measured
diagonally
Picture Tube
High Voltage (at zero beam
EXT-1/EXT-2/EXT-3 21-pin Euro connector
(Input / Output) (SCART socket)
AUDIO OUT (Variable) 0~1Vrms, Low Impedance
(RCA pin jack x 2)
75Q unbalanced, Coaxial
EXT-4 (Input) Video| 1Vp-p 75 (RCA pin jack)
Audio(L/R) | 500mVrms( -4dBs ), High
Impedance ( RCA pin jack )
S/ Video| y - 1Vp-p POSITIVE (Negative
sync Provided, when terminated
with 75Q)
C : 0.286Vp-p (Burst signal, when
terminated with 75 Q)
~—_——
<«_
<+\__
<+——_.
<+——_
<+—_
Headphone jack Stereo mini jack (@3.5mm )
Remote Control Unit RM-C50 (AAA/RO3 dry battery x 2) | RM-C51 (AAA/RO3 dry battery x 2)
Design & specifications are subject to change without notice.
2 No.51694

AV-32WFT1EPG
AV-32WFT1EPS
AV-32WFT1EKS
SPECIFICATIONS
AV-32WFT1EPG/AV-32WFT1EPS
AV-32WFT1EKS
Dimensions
(WxHxD)
|
855mmx
550mm
x
568mm
—_——
Mass
56.5kg
—_
TV
RF
System
CCIR
(B/G,
|
,L)
CCIR
(1)
PAL / SECAM /
Colour S PAL /
SOUS yeeon NTSC (Only in EXT mode)
Stereo
System
A2/
NICAM
NICAM
Teletext
System
Fastext
(United
Kingdom
system)
Fastext
(United
Kingdom
system)
TOP
(German
system)
WST(Standard
system)
WST(Standard system)
Receiving Frequency
VHF
47MHz ~ 470MHz
UHF | 470MHz ~ 862MHz
French CA TV} 116MHz ~ 172MHz/220MHz ~ 469MHz
Intermediate Frequency
VIF Carrier
SIF Carrier
470MHz ~ 862MHz
38.9MHz (B/G, | ,L) / 33.95MHz (L’)
33.4MHz (5.5MHz:B/G) / 32.9MHz (6.0MHz:l) /
32.4MHz (6.5MHz:L) / 27.45MHz (6.5MHz:L’)
Colour Sub Carrier Freq.
PAL
SECAM
NTSC
38.9MHz (1)
32.9MHz (6.0MHz:1)
4.43MHz 4.43MHz
4.40625MHz / 4.25MHz
3.58MHz / 4.43MHz
AC 220V-~240V , 50Hz
472W (Max) / 121W (Avg)
3.58MHz / 4.43MHz
Power Input
Power Consumption
121W/h(ITALY)
Aerial Input Term 75 Q unbalanced, Coaxial
Visible size : 76cm, Measured diagonally
+1kV <—___
31.0KV _4 5,y (at Zero beam current)
Speaker @ 10cm round x 2 ‘
Audio Output 7.5W + 7.5W
EXT-1/EXT-2/EXT-3
21-pin
Euro
connector
<
(Input / Output) (SCART socket)
EXT-4 (Input) Video| 1Vp-p 75Q(RCA pin jack)
Audio(L/R)| 500mVrms( -4dBs ), High Impedance ( RCA pin jack )
Y : 1Vp-p POSITIVE (Negative sync Provided, when
S/ Video! terminated with 75Q)
C : 0.286Vp-p (Burst signal, when terminated with 75
Q)
Picture Tube
High Voltage
AUDIO OUT 0~1Vrms, Low Impedance
(RCA pin jack)
<<
Headphone jack Stereo mini jack (¢3.5mm )
Remote
Control
Unit
RM-C50
(AAA/RO3
dry
battery
x
2)
RM-C51
(AAA/RO3
dry
battery
x
2)
No.51694 . 3

AV-28WFT1EPG AV-28WFTI1EIS
AV-28WFTIEPS AV-32WFT1EPG
AV-28WFTIEKS AV-32WFTIEPS
AV-28WFT1EK AV-32WFT1EKS
@ 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)
6
AUDIO R output 500mVrms(Nominal),
a
High impedance
AUDIO L output poomyons! (Nominal), oO oO
AUDIO GND ee Oe
oS
oi
GN
High baie:
FUNCTON SW Low : 0-3V, High : 8-12V, High
eS ee
Pe
pa Oe]
Poe Oe |
a
0
> &
ee
a
fewer
R/C input R: 700MVaw, 752 Oo O Oo
C:300MVp.p, 75Q (only R) (only C) (only C)
Low: 0- 0.4, High : 1 - 3V, 75Q
VIDEO output 1Vp.p(Negative going sync), 75 @
(TV) (LINE OUT)
= ©
No
mre herd [RE Se ee | es ee pe
o-) o a} BR] wo] nh ro) “
0 | VIDEO/Y input 1Vp.p(Negative going sync), 75Q Pre? OOc hy. Oe — 4
[Pin assignment]
20 18 16 14 12 10 8 6 4
MOOOOOUOOL
ee
21°19 17 15 13 11 9 7
4 No.51694

SAFETY PRECAUTIONS)
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.
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.
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
WARNING
The
equipment
has
been
designed
and
manufactured
to
meet
international
safety
standards.
itis
the
legal
responsibility
of
the
repairer
to
ensure
that
these
safety
standards
are
maintained.
aoPRONS=
Repairs must be made in accordance with the relevant safety standards.
AV-28WFT1EIS
AV-28WFT1EKS
AV-28WFT1EK _AV-32WFT1EKS
A WF “4EKS | AV-2
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
(A\)
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.
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.
Itis essential that safety critical components are replaced by approved parts.
\f mains voltage selector is provided, check setting for local voltage.
No.51694

AV-28WFT1EPG
AV-28WFT1EPS AV-32WFT1EPG
AV-32WFT1EPS
SAFETY PRECAUTIONS
AV-28WFTIEPG / AV-32WFTIEPG
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.
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.
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 (A\) 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.
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 : (.L) side GND, the
ISOLATED(NEUTRAL) : (4,) 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.
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).
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.
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 10kQ 2W resistor to the anode button.
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.
No.51694
9.
AV-28WFT1EPS / AV-32WFT1EPS
Isolation Check
(Safety for Electrical Shock Hazard)
After reassembling 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 1500Q 10W resistor paralleled by a 0.15yF
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.).
AC VOLTMETER
(HAVING 1000 Q/V,
OR MORE SENSITIVITY)
0.15uF AC-TYPE
PLACE THIS PROBE
ON EACH EXPOSED
1500 Q 10W METAL PART
GOOD EARTH GROUND

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 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.
AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
@ Built-in ECO (ECONOMY, ECOLOGY) MODE.
In
accordance
with
the
brightness
in
a
room,
the
brightness
ahd/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.
No.51694

AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS
AV-28WFT1EKS
AV-28WFT1EK
MAIN DIFFERENCE PARTS LIST (28”MODEL)
Model Name
AV-28WFT1EPG AV-28WFT1EPS AV-28WFTTEKS AV-28WFT1EK AV-28WFT1EIS
Part Name z
DOOR (SERVICE)
LC20265-003A-U | LC20265-010A-U LC20265-006A-U | LC20265-010A-U
POWER KNOB ;
(SERVICE)
S.DIAGRAM
ONLY ITALY(SERVICE)
REMOCON UNIT
2832WFT1-HSAE
RM-C50-1C
8 No.51694

AV-32WFT1EPG
AV-32WFT1EPS
AV-32WFT1EKS
MAIN
DIFFERENCE
PARTS
LIST
(32”MODEL)
Model Name
AV-32WFT1EPG
AV-32WFT1EPS
AV-32WFT1EKS
Part Name
MAIN
PWB
SJK-1701A-U2
SJK-1901A-U2
AV
SEL
PWB
SJKOS701A-U2
SJKOS901A-U2
POWER
CORD
QMPK160-185-JC
QMPN130-185-JC
FRONT
CABINET
LC10376-003B-U
LC10376-008A-U
CONTROL
SHEET
LC30597-002A-U
LC30597-006A-U
fe
DOOR
(SERVICE)
LC20265-003A-U
LC20265-010A-U
[Te
LC30578-002A-C
LC30578-006A-C
aa
LC20542-001A-U
LC20542-002A-U
LC20091-011A-U
AEM1039-071-E
AEM1039-077-E
AEM1039-073-E
LC10378-001D-U
LC10378-003A-U
LCT0619-001A-U
LCT0621-001A-U
RM-C51-1C
_
_—
-
POWER KNOB
(SERVICE)
A. | RATING LABEL
EURO LABEL *
REAR COVER
INST BOOK
INST BOOK
X-RAY CORD
>
$.DIAGRAM
ONLY ITALY (SERVICE)
REMOCON UNIT
RM-C50-1C
No.51694

AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS AV-32WFT1IEPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFTIEK AV-32WFT1EKS
FUNCTIONS
REMOTE CONTROL UNIT
REAR PANEL
@® Muting
@ Number Buttons
@ ZOOM
@ Hyper Sound
© Information
® Tv
@ Volume -/+
Standby
@® Colour Buttons
@ TEXT
@ OK/MENU
@2 PR Channel V/A
@ «ipl wla
@ EXT-1 Terminal
@ EXT-2 Terminal
@ EXT-3 Terminal
@ Aerial Socket
@® Audio out
EXT-4 terminals
Headphone jack (mini jack)
<1 (Volume) button
Remote control sensor
ECO sensor
®
®
®
©
©
©
10
P V/A buttons / <<] -/+ buttons
@ Hyper Sound lamp
ECO lamp
© Sleep timer lamp
@® Power lamp
@ Main power button
No. 51694

AV-28WFT1EPG AV-28WFTiEIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the power cord.
2. Remove the 13 screws marked ‘® ” as shown in the Fig. 1.
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 3 screws marked “© ” as shown in the Fig. 1.
2. Remove the claws marked ‘© ” under the CHASSIS as
shown in Fig. 2.
3. While raising the claw marked “€) " remove the top of the AV
TERMINAL BOARD slightly in the direction of arrow “© "as
shown in Fig. 2.
REMOVING THE DOME SPEAKER BOX and
SPEAKER HORN
@ After removing the rear cover.
[32” MODEL]
1. After removing the 2 screws marked “
speaker box as shown in Fig. 1.
”
remove the dome
2. After removing the 2 screws marked “A ” remove the speaker
horn as shown in Fig.1.
3. Follow the same steps when removing the other hand dome
speaker box and speaker horn.
NOTE: When removing the screws marked “© ” of the dome
speaker box remove the lower side screw first, and then
remove the upper screw.
REMOVING THE SPEAKER
[28” MODEL]
1. After removing the 2 screws marked zo) ” remove the speaker
box as shown in Fig. 3.
2. After removing the 2 screws marked “G) ” remove the speaker
as shown in Fig. 3.
3. After removing the 2 screws marked “‘® ” remove the speaker
adapter as shown in Fig. 3.
4. Follow the same steps when removing the other hand speaker.
REMOVING THE CONTROL BASE
@ After removing the CHASSIS.
1. While pushing down the claws marked ‘O ” . remove the
CONTROL BASE in the arrow direction “M ” as shown in Fig. 4.
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.
AV TERMINAL
BOARD
(N) . < CONTROL BASE
©
<>
CHASSIS
Fig. 4
No.51694 11

AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
\
12
[-- 7-7-7
This exploded view describes about 32” MODEL.
Although 28” MODEL are slightly different from this
figure, you can use the exploded view for
disassembling the 28” MODEL in the same step as
for the 32” MODEL.
32” MODEL
FRONT CABINET
Ww
AV SEL. PWB
POWER & DEF. PWB
CHASSIS
AV TERMINAL BOARD
REAR COVER
() ONLY 28” MODEL SPEAKER
SPEAKER BOX
M.S SPEAKER
SPEAKER ADAPTER
Fig. 3
Fig. 1 ?
No. 51694

AV-28WFT1EPG AV-28WFTI1EIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFTIEKS
REMOVING THE CRT
* Replacement of the CRT should be performed by 2 or more
persons.
CRT CHANGE TABLE
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.
e 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.
e 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.
e 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
Approx. Silicon grease
20mm (Do not should be coated
coat grease on by 5mm or more
this section from the outside
diameter of
anode cap.
CRT
Anode button
Anode button
(No sticking of
silicon grease)
Silicon grease
Coating position
coating
of silicon grease
Anode cap
No.
51694
13

AV-28WFT1EPG AV-28WFTIEIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
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.
14
Be sure to use memory ICs written with the initial data vaiues.
Power on
Plug the power cord into the outlet and switch the power on.
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 MODEL=JK-EURO (Vs, ss)
INFORMATION key and MUTING key simultaneously, and the NEE ea
SYSTEM CONSTANT SET screen of Fig. 2 will be displayed. MODEL > WFT
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.
Press the MENU key to memorize the setting value.
Press the INFORMATION key twice, and return to the normal
screen.
Setting of receive channels
Set the receive channel.
For setting, refer to the OPERATING INSTRUCTIONS.
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.
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.
No. 51694
SERVICE MENU
1. IF 2. WiC
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7: SELECT @: exit
Fig.1
SYSTEM CONSTANT SET
-+@Q: STORE @: Exit
JVC JK EURO VOO
Feo ORIOK ook
Fig.2
NAME OF REMOTE CONTROL KEY
Names of key
INFORMATION
MUTING
MENU
FUNCTION UP/DOWN
FUNCTION -/+
slestaalale

AV-28WFT1EPG
AV-28WFT1EIS
AV-28WFTIEPS
AV-32WFT1EPG
AV-28WFT1EKS
AV-32WFT1EPS
AV-28WFT1EK
AV-32WFT1EKS
SETTING
VALUES
OF
SYSTEM
CONSTANT
SET
(TABLE
1)
Setting value
oma]
|
=
|e
|
|
USER SETTING VALUES (TABLE 2)
| ID
EXT SETTING
TINT
BLANK
CONTRAST
S-IN
BLANK
BRIGHT
REFER
to
VSM
PRESET
DUBBING
EXT-1—EXT-2
SHARP
COLOUR
ECO MODE OFF
PICTURE
FEATURES FEATURES
Faure
VNR
AUTO
SLEEP
TIMER
OFF
COLOUR SYSTEM TV : According to preset CH
EXT
:
AUTO
|
BLUE
BACK.
ON
4:3
AUTO
ASPECT
PANORAMIC
CHILD
LOCK
ID
:
Nok
PICTURE
TILT
CENTER
|
ALL
CH
OFF
| DECODER (EXT-2) OFF
SOUND
SETTING
INSTALL
STEREO/
1-TI
>)
LANGUAGE
ENGLISH
BAS
BALANCE
|
EDIT/MANUAL
PRESET
CH
only
ALC
OFF
The
others
:
BLANK
BBE
ON
HYPER SOUND OFF
SPEAKER
ON
SERVICE MENU SETING ITEMS (TABLE 3)
Setting
item
Setting
value
Setting
item
Setting
value
1.
1F
4.
DEF.
1.
V-SHIFT
2.
V-SIZE
3.
SUBTITLE
4.
H-CENT
5.
H-SIZE
6.
EW-PIN
7.
TRAPEZ
1.
CUT
OFF
8.
EW.COR.L
2.
DRIVE
9.
EW.COR.H
4.
CONT.
11.
V.
LIN
6.
HUE
13.
H-BLK-L
7.
BLACK
OFFSET
(Only
SECAM)
44.
V-EHT
8.
SHARP
15.
H-EHT
9
PURITY
16.
EMT-GAIN
5. VSM
PRESET
1.
BRIGHT
COOL
2.
CONT.
NORMAL
3.
COLOUR
WARM
4.
SHARP
5.
HUE
6.
RDRIVE
7.
BDRIVE
1.
AUDIO
1.
CONC
LIMIT
6.
VPS
VPS
(Do
not
adjust)
2.
AZID
THR
(Do
not
adjust)
PDC
3.
ALC
4
BASS
7.
AUTO
PROGRAM
ON
/
OFF
5.
TREBLE
(Do
not
adjust)
No.
51694
15

AV-28WFTiEPG AV-28WFTIEIS
AV-28WFTiIEPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
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.
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.
Make sure that connection is correctly made to AC power
source.
Turn on the power of the TV and measuring instrument for
warming up for at least 30 minutes before starting adjustment.
If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
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 possition
PICTURE MODE (VSM)
SLEEP TIMER
BALANCE
ECO
ZOOM
DIGTAL SURROUND
NORMAL
CENTER
PANORAMIC
MEASURING INSTRUMENT AND FIXTURES
PON
DC voltmeter (or digital voltmeter)
Oscilloscope
Signal generator (Pattern generator) [PAL / SECAM / NTSC]
Remote control unit
ADJUSTMENT ITEMS
16
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. 51694

AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFTI1EK AV-32WFT1EKS
ADJUSTM ENT LOCATIONS
FRONT
FRONT
CONTROL
PWB
(R)
FRONT
CONTROL
PWB
(L)
FRONT
CRT SOCKET PWB (SOLDER SIDE) apin:NG
5pin:GND
TP-47B)
FOCUS4(F1)
FOCUS2(F2)
LO lo
No. 51694

AV-28WFT1EPG AV-28WFT1EIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
BASIC OPERATION SERVICE MENU
1.
18
TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
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):
(0 ie A Se This mode adjusts the setting values of the IF circuit.
(2) 2MIC vse eee r cere rece eens This mode adjusts the setting values of the VIDEO / CHROMA circuit.
(3) 3.AUDIO «+--+ ee eer e reece This mode adjusts the setting values of the multiplicity SOUND circuit.
(4) 4.DEF veer eee e reer eee renee 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)
16:9 ZOOM SUBTITLE (50/60Hz)
FULL (50/60Hz)
(5) 5.VSM PRSET ---:---+++++- This mode adjusts the initial setting values of COOL,NOMAL and WARM.
(VSM : Video Status Memory)
(6) EVPS vere reece eee renee This mode shows the monitor of the VPS and PDC.(Do not adjus#).
: (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)
BASIC OPERATION OF SERVICE MENU
(1) How to enter SERVICE MENU 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.
SERVICE MENU
1.1F 2. VIC
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7 : SELECT @: ExiT
Fig.1
2 .
(2) Selection of SUB MENU SCREEN NEME OF REMOTE CONTOROL KEY
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 INFORMATION
3. AUDIO
4. DEF.
5. VSM PRESET MENU
6. VPS
7. AUTO PROGRAM
FUNCTION UP/DOWN
FUNCTION -/+ C )
Fig.2
es
®
So |
No. 51694

AV-28WFT1EPG AV-28WFTIEIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFT1EPS
AV-28WFT1EK AV-32WFT1EKS
SERVICE MENU
SERVICE MENU
1. 1F 2. VIC
3. AUDIO 4, DEF
SUB MENU 7. AUTO PROGRAM
(Do not adjust)
7. AUTO PROGRAM (OFF)
7. AUTO PROGRAM (ON)
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7: SELECT @: xT
SUB MENU 5. VSM PRESET
VSM PRESET NORMAL
SUB MENU 1.1F (VCO)
VCO (CW) #«, 4k MHz
COOL
TOO
HIGH
NORMAL
ABOVE
REFERENCE
WARM
1.BRIGHT
JUST
REFERENCE
BELOW
REFERENCE
1.
BRIGHT
TOO
LOW
2.
CONT.
-+
Gx):
STORE
@:
exit
3.
COLOUR
J
@:
exit
4.
SHARP
5.
HUE
6.
R
DRIVE
7.
BDRIVE
SUB MENU 6. VPS (Do not adjust)
VPS
VPS = 0000H(- - -)
PDC 8/30/1 =0404H
@: Exit
SUB MENU 2. V/C
vic PAL
1. CUTOFF (R) #®e
(G) ee
(B) eee
- +k]: STORE @: EXIT
SUB MENU 3. AUDIO (Do not adjust}
AUDIO
4. CONC LIMIT OAH
C_AD_BITS = 00000000
- +@k]: store @: exit
SUB MENU 4. DEF
DEF PANORAMIC +*Hz
1. V-SHIFT eR
(#*)
- + [ox]: STORE @: EXIT
Fig. 3 SUB MENU SCREEN
No. 51694
. CUT OFF
. DRIVE
. BRIGHT
CONT.
. COLOUR
HUE
. BLACK OFFSET
. SHARP(Do not adjust)
. PURITY(Do not adjust)
Cc
1. CONC LIMIT
2. A2 ID THR
3. ALC
4. BASS
Ls TREBLE
C4. 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(Do not adjust)
15. H-EHT(Do not adjust)
\_ 16. EHT-GAIN(Do not adjust)
19

AV-28WFT1EPG AV-28WFTIEIS
AV-28WFT1EPS AV-32WFT1EPG
AV-28WFT1EKS AV-32WFTIEPS
AV-28WFT1EK AV-32WFT1EKS
(3) Method of Setting
1) Method of Setting 1.1F
[VCO]
oO) 1 Key ace yawe:ibin Tesh se,"s ‘eleletinnedyie.e/0ia'w: eVevene Select 1.1F.
@ The VCO (CW) screen will be displayed in yellow when the AFC voltage is at a certain level and in blue when it is at other levels.
@ INFORMATION Key----++---+-- Return to the SERVICE MENU screen.
2) Method of setting 2.V/C, 3.AUDIO, 4.DEF and 5.VSM PRESET.
MD 2~5 Keyser secre reece eee eeees Select one from 2. V/C, 3. AUDIO, 4. DEF and 5. VSM PRESET.
@ FUNCTION UP/DOUN Key ------ Select setting items.
@ FUNCTION -/t- esses sere e renee Set (adjust) the setting values of the setting items.
(Use the number keys of the REMOTE CONTROL UNIT for setting of WHITE BALANE.
For the setting, refer to each item concerned.)
@ MENU Key------r seer eee renee Memorize the setting value.
(Before storing the setting values in memory, do not press the CH, TV, POWER ON/ OFF key -
if you do, the values will not be stored in memory.)
© INFOMATION Key «--+++++- +e: Return to the SERVICE MENU screen.
3) Method of setting 6.VPS and 7.AAUTO PROGRAM.
B.VPS vette cece eee eee eens This mode displayed monitor of VPS systems. (Do not adjust)
7.AUTO PROGRAM: + eter teeters When the MAIN POWER is turned on with the state of AUTO PROGRAM ON, you get a mode
that initializes every existing set value including language selection. Because this mode is set
at the factory upon completion of the adjustment, you need not to use it for service. (Do not
adjust in this mode.)
(4) Release of SERVICE MENU
1) After completing the setting, return to the SERVICE MENU, then again press the INFORMATION key.
20 No. 51694