JVC AV28L2EUBL, AV28L2EUGR, AV28L2EUGY Service Manual

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SER VICE MANUAL

COLOUR TELEVISION

V28L2EUG

V28L2EUBL

V28L2EUG

BASIC CHASSIS

AV28L2EUGR
AV28L2EUBL
AV28L2EUGY

MF

CONTENTS

SPECIFICATIONS

!

SAFETY PRECAUTIONS

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FEATURES

!

MAIN DIFFERENCE LIST

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SPECIFIC SERVICE INSTRUCTIONS

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SERVICE ADJUSTMENTS

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PARTS LIST

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★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

1

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COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

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･･････････････････････････････････････････････････････････

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････････････････････････････････ ････

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31

2-1

No.51778
May. 2001

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V28L2EUGR

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V28L2EUBL
V28L2EUG

SPECIFICATIONS

Item Content

Dimensions ( W
Mass
TV RF System
Colour System

Stereo System
Teletext System

Receiving Frequency

Intermediate Frequency

Colour Sub Carrier Freq.

Power Input
Power Consumption

Aerial Input Term
Picture Tube
High Voltage

Speaker
Audio Output

EXT-1/EXT-2/EXT-3 (IN/OUT)
EXT-4 (Input) Video

D )

××××H××××

VIF Carrier
SIF Carrier

SECAM

Audio(L/R)

S / Video

VHF
UHF

PAL

NTSC

800mm×500mm×498mm

41.0kg
CCIR ( B/G, D/K, L, L’, I )
PAL / SECAM / NTSC (Only in EXT mode)

A2 (B/G, D/K) / NICAM (B/G, I, D/K, L)
Fastext (UK system) / TOP (German system)

WST(Standard system)

47MHz ～ 470MHz
470MHz ～ 862MHz

French cable TV channel of broadcast frequencies 116～172MHz & 220～469MHz

!

38.9MHz (B/G, D/K, I, L) / 33.95MHz (L’)

33.4MHz (5.5MHz : B/G)

32.9MHz (6.0MHz : I ) / 32.4MHz (6.5MHz : L, D/K) / 40.45MHz (6.5MHz : L’)

4.43MHz

4.40 625MHz / 4.25MHz

3.58MHz / 4.43MHz
AC 220V～240V , 50Hz
183W(Max) / 127W(Avg),
75Ωunbalanced, Coaxial

Visible size : 66cm, Measured diagonally

+

31.0kV (at zero beam current)
20cm×4cm, Oval type×2 with BOX

7.5W + 7.5W
21-pin Euro connector (SCART socket)×3

1Vp-p 75Ω(RCA pin j ac k)
500mVrms(-4dBs), High Impedance (RCA pin jack)

Y : 1Vp-p POSITIVE (Negative sync Provided, when terminated with 75Ω)
C : 0.3Vp-p (Burst signal, when terminated with 75Ω)

1.0kV

-1.5kV

AUDIO OUT (Variable)

Headphone jack
Remote Control Unit

0～1Vrms, Low Impedance (RCA pin jack×2)

Stereo mini jack (φ3.5mm )
RM-C54 (AAA/R03 dry cell battery×2)

Design & specifications are subject to change without notice

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No.51778

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21-pin Euro connector (SCART socket) : EXT-1 / EXT-2 / EXT-3

(P-P= Peak to Peak, B -W= Bl ank ing to white peak)

Pin

Signal Designation Matching Value EXT-1 EXT-2 EXT-3

No.

1 AUDIO R output 500mVrms(Nominal),

Low impedance

2 AUDIO R input 500mVrms(Nominal),

High impedance

3 AUDIO L output 500mVrms(Nominal),

Low impedance

4 AUDIO GND
5 GND (B)
6 AUDIO L input 500mVrms(Nominal),

High impedance

7B input
8 FUNCTON SW

(SLOW SW)

9 GND (G)
10 SCL3 NC
11 G input
12 SDA3 NC
13 GND (R)
14 GND (YS)
15 R / C input

16 Ys input
17 GND(VIDEO output)
18 GND(VIDEO input)
19 VIDEO out pu t

20 VIDEO / Y input
21 COMMON GND

700mV
Low : 0-3V, High : 8-12V, High

impedance

700mV

R : 700mV
C : 300mV
Low : 0 - 0.4, High : 1 - 3V, 75

1V

1V

, 75

Ω○○

B-W

, 75

Ω○○

B-W

, 75

Ω

B-W

, 75

Ω

P-P

(Neg ati ve g oin g s ync ) , 75

P-P

(Neg ati ve g oin g s ync ) , 75

P-P

Ω○ ○

Ω○

Ω○ ○ ○

○

(TV OUT)

○○○

○

(TV OUT)

○○○

○○○

○○○

○○○

○○○

○○○

○○

○

(only R)

○○○

○○○

(TV)

○○○

○

(LINE OUT)

○

(LINE OUT)

○

○

○○

○

(LINE OUT)

V28L2EUG

V28L2EUBL

V28L2EUG

NC

NC

NC

NC
NC
NC

NC

(only C)

NC

NC

Pin assignment

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No.51778

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V28L2EUGR

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V28L2EUBL
V28L2EUG

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
manuf act urer's warr anty and will fur t her reliev e the manuf actur er
of responsi bility f or person al injury or pr operty dam age res ulting
therefrom.

3. Many electrical and mechanical parts in the products have
special safety-related characteristics. These char acteristics are
often not evident f rom visual i nspection nor can t he protect ion
afford ed by them n ecess arily be obt ained by using rep lacem ent
compon ents rated f or higher voltag e, watt ag e, etc. R epl acem ent
parts which have these special safety characteristics are
identified in the parts list of Service manual.

compon ents hav in g su ch feat ures are id entif ied by s hadin g
on the sche matics and by (
manual.

have the same safety characteristics as the recommended
replac ement part shown i n the p arts list of S ervic e manu al may
cause shock, fire, or other hazards.

The us e of a subst itute replacement which does not

) on the parts list in Service

!!!!

Electrical

4.

Don't short b etween the LIV E side groun d 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 th e GND is sh own by the LI VE : (") 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 meas ure with a measuri ng apparatus (osc illoscope etc .)
the LIVE side GND and ISOLATED(NEUTRAL) side GND or
EARTH side GND at the same time.
If above not e wi ll n ot be kept, a fuse or any parts w ill 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 hig h voltage app lied t o the picture t ube must c onform wit h
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
voltag e conditions s hould b e kept to a mi nimum, or sh ould be
prevented. If severe arcing occurs, remove the AC power
immediately and determine the cause by visual inspection
(incorrect inst allation, cracked or m elted high voltage harness,
poor solderi ng, etc.). To maintain the pr oper minimum le vel of
soft X-Ray emission, components in the high voltage circuitr y
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
pictur e tube bef ore attempting met er connect ion, by connecting
a clip l ead to th e g roun d fr am e and c on necti ng t h e oth er end of
the lead through a 10k" 2W resistor t o the an ode button .

8. W hen servic e is requir ed, obser ve the origin al lead dress . Extr a
precaut ion shou ld be gi ven to assure c orrect l ead dr ess in t he
high voltage circuit area. W here a short circuit has occurred,
those comp onents that in dicat e evidenc e of over heating should
be replaced. Always use the manufacturer's replacement
components.

9.

Isolation Check
(Saf ety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna
termin als , vid eo/ au dio inpu t an d output term inals, Con t r ol kn obs,
metal c abinet, s crewhead s, earph one j ack, contr ol shafts, etc.)
to be sure the product is safe to operate without danger of
electrical shock.

(1)

Dielectric Stren g th Test

The isol ation b etween th e AC pr imar y circuit and all metal parts
expos ed t o th e user, p ar tic u larly any exp osed met al part h avi ng a
return p ath to the chassis should withst and a voltage of 3000V
AC (r.m.s .) for a peri od of on e s ec ond.

(. . . . W ithstand a voltag e of 1100 V AC ( r.m.s.) to an applianc e

rated up t o 120V, and 3000 V AC (r. m.s.) t o an appl iance r ated
200V or mor e, f or a peri od of on e s ec on d.)
This method of test requires a test equipment not generally found
in the service trade.

(2)

Leak age Current Check

Plug the AC lin e c or d dir ec t l y int o t he AC outl et (do not us e a lin e
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. ). An y leak age c urr ent mus t 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 lin e c or d dir ec t l y int o t he AC outl et (do not us e a lin e
isolati on transform er during t his check. ). Use an AC voltmet er
having 1000 ohms per volt or more sensitivity in the following
manner. Connect a 1 500" 10W resistor paralleled by a 0.15#F
AC-typ e capacitor betw een an expos ed metal part and a know n
good earth ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the resistor
connect ion t o each exp os ed met al p art, part icul arl y any exp osed
metal part h avin g a return p ath to th e chassis , and meas ure th e
AC voltag e across the res istor. N ow, re vers e 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 , i n t ropic al area, this m us t n ot exceed 0. 3 V A C (r. m.s .).
This corresponds to 0.2mA AC (r.m.s.).

0.15μF AC-TYPE

1500

GOOD EARTH GROUND

"

AC VOLTMETER
(HAVING 1000
OR MORE SENSITIVITY)

10W

"

/V,

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

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No.51778

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FEATURES

V28L2EUG

V28L2EUBL

V28L2EUG

New chassis design enable use of an interactive on screen

"

control.

The TELETEXT SYSTE M has a built-i n FAST EXT ( UK s ystem),

"

TOP (German system) and WST (world standard system)
system.

Pure FLAT CRT reproduce fine textured.

"

Digi Pure pro : Auto digi pure with motion picture compensation.

"

B ecause this TV uni t corresp onds t o multipl ex broadc ast, us ers

"

can enjo y music pr ograms an d spor ting ev ents wit h live real ism.
In additi on, BILINGUAL programs c an 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 th e opti mu m pictur e wh ic h is eas y on th e ey e.

TV EXT-1 EXT-3

Users can make VCR dubbing of picture and sound by controlling

"

the AV select or to sel ect an opti onal sour ce at the E XT-2 output
shown in figure.

EXT-4

EXT-2

MAIN DIFFERENCE LIST

Model name

!!!!

Part name

FRONT FRAME LC11007-001B-U LC11007-002B-U LC11007-003A-U

!

RATING LABEL

!

EURO LABEL AEM1052-017-E AEM1052-014-E AEM1052-071-E

AV28L2EUGR AV28L2EUBL AV28L2EUGY

LC20380-008A-U
LC20379-008A-U

LC20380-012A-U
LC20379-012A-U

LC20380-023A-U
LC20379-019A-U

No.51778

5

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V28L2EUGR

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V28L2EUBL
V28L2EUG

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power cord.

2. Remove the 11 screws marked ”A” as shown in the Fig. 1.

3. Withdraw the rear cover toward you.

REMOVING THE SIDE C ON TRO L JACK ASSEMBLY

After removing the rear cover.

"

1. Remove the sc r ew m ark ed B as shown in the Fig.1.

2. While slight l y r aise the side control jack assembl y, remo ve th e 2
claws under the side control jack assembly.

3. Disconnect t he c onn ector “SR”, “SL”, “S”, “F” and “K” as shown
in Fig 2.

REMOVING THE SIDE CONTROL PWB

After removing the rear cover and side control jack assembly.

"

1. R emove the 3 c laws “C” f rom b ack s i d e of t h e s i d e co n tro l j ac k
assembly as shown in Fig.2.

2. Pull out the SIDE CONTROL PWB.

REMOVING THE CHASSIS

After removing the rear cover.

"

1. Slightly rais e the b ot h sid es of the c hass is b y h and and r em ove
the two c laws und er th e both s id es of the c has sis from the f r ont
cabinet.

2. Withdraw the chassis backward.
(If necessary, take off the wire clamp, connectors etc.)

REMOVING THE SPEAKER BOX

After removing the rear cover.

"

1. Remove the 2 screws marked ”D” as shown in Fig. 1.

: W hen removing t he screws marked D of th e speaker b ox

NOTE

assembly, remove the lower side screw first, and then
remove the upper one.

2. Remove the 2 screws “E” attaching the speaker box.

3. Remove the 2 screws “F” attaching the speaker.

4. 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 t he ch assis vertic ally s o that you c an easi ly ch eck th e
back side of the PW Board.

[CAUTION]

When erecting the chassis, be careful so that there will be no

"

co n tac ti ng wit h oth e r PW B o ard .

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 (BRAID ED ASS’Y) is conn ected 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 inad ver tent l y remov ed, b e sur e to ti e th e wir es with
a new cable tie.

Connector

SR
SL
S

F

K

(Back view)

Fig. 2

C

SIDE CONTROL
PWB

C

REMOVING THE AV TERMINAL BOARD

After removing the rear cover.

"

1. Remove the 3 screws marked ”G” as shown in the Fig. 1.

2. Remove the 2 cl aws mark ed “H” under the CH ASSIS as sh own
in Fig. 3.

3. Remove th e AV TERMIN AL BOARD slig htly in the direc tion of
arrow ”I” as shown in Fi g. 3.

6

No.51778

V TERMINAL

BOARD

I

H

H

AV SW PWB

Fig. 3

A

R

A

A

Y

A

D

A

V28L2EUG

V28L2EUBL

V28L2EUG

SPEAKER

FRONT CABINET

Fig. 2

F

SPEAKER

CRT
SOCKET
PWB

FRONT
CONTROL
PWB

CONTROL

B

BASE

CLAW

MICON
PWB

CLAW

100Hz

PWB

D

F

V SW

PWB

MAIN PWB

BOX

E

POWER &
DEF. P WB

CHASSIS

V TERMINAL

BOARD

G

(×3)

E

SIDE
CONTROL
JACK
ASSEMBLY

SPEAKER

SPEAKER
BOX

REAR COVER

Fig. 1

A

POWER CORD

(×11)

No.51778

7

A

V28L2EUGR

A

A

Y

A

A
A

A

A

V28L2EUBL
V28L2EUG

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.4).

2. While keeping the surface of CRT down, mount the TV set on the

CRT change table balanced will as shown in Fig.5.

3. Remove 4 scr ews m ar k ed b y arrows with a box typ e sc r ew driver

as shown in Fig.5.

Since the cabi n et wi ll drop wh en s c rews have been rem o ved , be

!

sure to support the cabinet with hands.

4. After 4 sc rews have been removed, put th e cabinet sl owly on

cloth (At this time, be carefully so as not to damage the front
surface of the cabinet) shown in Fig.6.

The CRT should be assembled according to the opposite

!

sequence of its dis m oun ti ng steps.

T he CRT ch ang e t ab l e shoul d preferab ly be smaller th at th e CRT

$

surfac e, and its heig ht b e ab out 35cm.

About CRT Spacer

$

An appropriat e C R T s p ac er s h ou ld be used in the corres p on di ng
CRT in accordance with th e type of the CRT.
When a CRT is repl ac ed, s peci al att enti on s houl d be p aid to t his
matter.

CRT CHANGE TABLE

PPROX.

35cm

CLOTH

Fig. 4

COAT ING OF SILICON GREASE FO R ELECTRICAL
INSULATION ON THE CRT ANODE CAP SECTION.

Subsequ ent to rep lacemen t of t he CRT and HV transf ormer or

!

repair of the anode c ap, etc. by dismou nting them, be sure to
coat silicon greas e f or el ec trical insulati on as sh own in F i g. 7.
Wipe around the anode button with clean and dry cloth. (Fig.7)
Coat sil icon gr eas e on t he s ection arou nd the anod e but ton. A t
this ti me, t ak e c are s o th at an y si lic on gr eas es d os e not s tic k to
the anode button. (Fig.8)

Silicon grease product No. KS - 650N

★★★★

CRT

node button

Silicon gr ease

coating

CABINET

pprox.
20mm (Do not
coat grease on
this section

node button
(No sticking of
silicon grease)

Fig. 5

CRT

CRT
CHANGE TABLE

Fig. 6

Silicon gr ease
should b e c oat ed
by 5mm or mor e
from the outside
diamet er of
anode cap.

Coating positi on
of silicon grease

node cap

Fig. 7 Fig. 8

8

No. 51778

A

R

A

A

Y

REPLACEMENT OF MEMORY ICs

1. Memory ICs

This TV use mem ory ICs . In the mem or y ICs, there ar e memor iz ed dat a
for cor rectl y op er ating th e vi deo an d def l ection cir cu its. W h en r epl acing
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 th e p ow er off and unpl ug the p ow er c ord from the w all ou tl et.

SERVICE MENU

1. IF 2. V/C

3. AUDIO 4. DEF

5. VSM PRESET 6. STATUS

7. PIP 8.

9. SHIPPING (OFF) 0. BUS FREE
1-9 : SELECT : EXITi

Fig.1

V28L2EUG

V28L2EUBL

V28L2EUG

(2)

Replace ICs

.

Be sure to use memory ICs written with the initial data values.

(3)

Power on

Plug the power cord into the wall outlet and switch the power on.

(4)

Check and set SYSTEM CONSTANT SET:

It must not adjust with ou t sign al.

****

1) Press the INFORMATION key and the MUTING key of the
REMOTE CONTROL UNIT simultaneously.

2) T he SERVICE MEN U scr een of F ig . 1 wil l b e dis pl ayed.

3) While the SERVICE MENU is displayed, press the
INFORM ATION key and MUT ING key s imultan eousl y, and th e
SYSTEM CONSTANT SET screen of Fig. 2 wi ll b e dis pl ay ed.

4) Ch eck t he s etti ng valu es of th e SY STE M CON STA NT S ET of
Table 1. If the valu e is dif f erent , s elect the s et ting item wi th th e
FUNCTION UP/DOWN key, and set th e correct value with the
FUNCTION -/+ key.

5) Press the MENU(OK) key to memorize the setting value.

6) Press the INFORMATION key, and return to the normal screen.

(5)

Setting o f re ce iv e channel s

Set the receive channel.
For setting, refer to the OPERATING INSTRUCTIONS.

(6)

Setting of SERVICE MENU

Verif y the s etting items of th e

SERVICE MENU

wh ere neces sary .
For setting, refer to the SERVICE ADJUSTMENTS.

of Table 2, and reset

SYSTEM CONSTANT SET

1. DESTINATION EU

OK

+ : STORE : EXIT

i

Fig.2

2. CRT TYPE 16 : 9

3. PURITY NO

4. PICTURE TILT YES

5. DIGIPURE PRO YES

6. PIP NO

7. PIC & TEXT YES

8. DOLBY NO

9. BBE YES

10. PROGRESSIVE YES

11. TDA9178 YES

12. TONE IC NO

13. FLAT YES

NAME OF REMOTE CONTROL KEY

Names of key

INFORMATION

key

iiii

MUTING

MENU

OK

(7)

User setti n gs

Check th e us er s ett in g values of T abl e 3, and if setti ng v al ue is
different, set the correct value.

FUNCTION UP/DOWN

▼

▼

For setting, refer to the OPERATING INSTRUCTIONS.

▼

TV

▼

+

9

FUNCTION -/+

TV

No. 51778

A

V28L2EUGR

A

A

Y

V28L2EUBL
V28L2EUG

SETTIN G VALUES OF SYSTEM CONSTANT SET (TABLE 1)

Setting item Setting content Setting value

1. DESTINATION EU

2. CRT TY P E 16 : 9

3. PURITY NO

4. PICTURE TILT YES

5. DIGIPURE PRO YES

6. PIP NO

7. PIC & TEXT YES

8. DOLBY NO

9. BBE YES

10. PROGRESSIVE YES

11. TDA9178 YES

12. TONE IC NO

13. FLAT YES

EK EU EI

16 : 9 4 : 3

YES NO

YES NO

YES NO

1 TUNER

YES NO

YES NO

YES NO

YES NO

YES NO

YES NO

YES NO

2 TUNER

NO

SERVICE MENU SETTING ITEMS (TABLE 2)

Setting item Setting value Setting item Setting value

1. IF 1. VCO 4. DEF. 1. V-SHIFT

2. V-SIZE

3. H-CENT

4. H-SIZE

5. TRAPEZ

2. V / C 1. RGB BLK

2. WDR R

3. WDR G

4. WDR B

5. BRIGHT

6. CONTRAST

7. COLOUR

8. HUE

9. SHARP

10. VCO ADJUSTMENT

11. VIDEO AGC

12. SYNC SLICE

5. VSM PRESET
COOL
NORMAL
WARM

6. EW-PIN

7. COR-PIN

8. COR-UP

9. COR-LO

10. ANGLE

11. BOW

12. V-S.CR

13. V.LIN

1. CONT.

2. BRIGHT

3. SHARP

4. COLOUR

5. HUE

6. WDR R

7. WDR G

8. WDR B

3. AUDIO

(Do not adjust)

10

1. ERR LIMIT

2. A2 ID THR

6. STATUS

No. 51778

(Do not adjust)

VPS
PDC