Jvc Av-27d502/r User manual

SERVICE MANUAL

AV-27D502

COLOR TELEVISION

BASIC CHASSIS

AC

No. 51797

Mar. 2001

TV

AV-27D502 /R

AV-27D502 /S

CONTENTS

aSPECIFICATIONS ....................................................................................................................................2

aSAFETY PRECAUTIONS ........................................................................................................................3

aFEATURES ..............................................................................................................................................5

aMAIN DIFFERENCE LIST........................................................................................................................6

aHOW TO IDENTIFY MODELS ..................................................................................................................6

aFUNCTIONS .............................................................................................................................................7

aSPECIFIC SERVICE INSTRUCTIONS ....................................................................................................8

aSERVICE ADJUSTMENTS ....................................................................................................................12

¤STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1

aPARTS LIST ...........................................................................................................................................31

AV-27D502

2 No. 51797

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SPECIFICATIONS

Items Contents

Dimensions (W ×H ×D)

Mass

TV RF System

Color Sound System

TV Receiving Channels and Frequency

VL Band

VH Band

UHF Band

CATV Receiving Channels and Frequency

Low Band

High Band

Mid Band

Super Band

Hyper Band

Ultra Band

Sub Mid Band

TV/CATV Total Channel

Intermediate Frequency

Video IF Carrier

Sound IF Carrier

Color Sub Carrier

Power Input

Power Consumption

Picture Tube

High Voltage

Speaker

Audio Power Output

Video / Audio Input (1 / 2 / 3)

Audio Output

(Variable)

AV Compu link EX Input

Antenna terminal

Remote Control Unit

29-5/8” ×23-1/4” ×19-1/2” / 75.2cm ×59.1cm ×49.4cm

71.3 Ibs/32.4kg

CCIR(M)

NTSC, BTSC System (Multi Channel Sound)

(02~06) 54MHz~88MHz

(07~13) 174MHz~216MHz

(14~69) 470MHz~806MHz

(02~06, A-8) by (02~06&01) —

(07~13) by (07~13)

(A~1) by (14~22)

(J~W) by (23~36) (54MHz~804MHz)

(W+1~W+28) by (37~64)

(W+29~W+84) by (65~125)

(A8, A4~A1) by (01, 96~99) —

180 Channels

45.75MHz

41.25MHz (4.5MHz)

3.58MHz

120V AC, 60Hz

123W

27” (68cm) Measured Diagonally

29kV±1.3kV (at zero beam current)

2” ×4-3/4” / 5 ×12cm Oval type ×2

5W ×2

Video(1,3) : 1Vp-p, 75Ø(RCA pin jack)

Audio(1,2,3) : 500mVrms ( -4dBs ), High Impedance (RCA pin jack)

S-Video ( Input 1 / 2 Over )

Y : 1Vp-p Positive (negative sync provided, when terminated with 75Ø)

C : 0.286Vp-p (burst signal, when terminated with 75Ø)

Component Input ( Input 2 )

Y : 1Vp-p positive (negative sync provided, when terminated with 75Ø)

PB/PR: 0.7Vp-p 75 Ø

Variable : More then 0~1550mVrms (+6dBs)

Low impedance (400Hz when modulated 100%)

(RCA pin jack)

3.5mm mini jack

75Ø(VHF/UHF) Terminal, F-Type Connector

RM-C301G-2A

(AA/R6/UM-3 battery ×2)

Design & specifications are subject to change without notice.

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AV-27D502

No. 51797 3

SAFETY PRECAUTIONS

1. The design of this product contains special hardware, many circuits

and components specially for safety purposes. For continued pro-

tection, 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 manufactur-

er's warranty and will further relieve the manufacturer of responsi-

bility 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 recom-

mended replacement part shown in the parts list of Service manual

may cause shock, fire, or other hazards.

4. Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are

connected to one side of the AC power line.An isolation transformer

of adequate capacity should be inserted between the product and

the AC power supply point while performing any service on some

products when the HOT chassis is exposed.

5. Don't short between the LIVE side ground and ISOLATED (NEU-

TRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The dif-

ference 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.

6. 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).

7. 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 dam-

age, 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.

8. 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 10kØ2W resistor to the anode button.

9. 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 com-

ponents that indicate evidence of overheating should be replaced.

Always use the manufacturer's replacement components.

10. 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 prod-

uct 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 1100V 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 hav-

ing 1000 ohms per volt or more sensitivity in the following manner.

Connect a 1500Ø10W resistor paralleled by a 0.15µF AC-type ca-

pacitor between an exposed metal part and a known good earth

ground (water pipe, etc.). Measure the AC voltage across the resis-

tor with the AC voltmeter. Move the resistor connection to each ex-

posed metal part, particularly any exposed metal part having a re-

turn 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.).

11. High voltage hold down circuit check.

After repair of the high voltage hold down circuit, this circuit shall be

checked to operate correctly.

See item “How to check the high voltage hold down circuit”.

GOOD

EARTH

GROUND 0.15 µF AC-TYPE

AC VOLTMETER

(HAVING 1000Ø/V,

OR MORE SENSITIVITY)

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

1500Ø10W

A V

This mark shows a fast

POWER CORD

REPLACEMENT WARNING

Connecting thr white line side of

power cord to “WHT” character side.

operating fuse, the

letters indicated below

show the rating.

PWB

WHT

PW

White line side

AV-27D502

4 No. 51797

aCAUTIONS

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.

aSOLDERING 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.

aREPLACEMENT STEPS

1. How to remove Chip parts

Resistors, capacitors, etc.

(1) As shown in the figure, push the part with tweezers and alter-

nately 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 alter-

nately melt the solder at each lead. Shift and remove the chip

part.

Note : After removing the part, remove remaining solder from the

pattern.

REPLACEMENT OF CHIP COMPONENT

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

A

B

C

A

B

C

AV-27D502

No. 51797 5

FEATURES

•Full-square CRT (cathode ray tube) reproduces fine textured pic-

ture in every detail.

•I2C bus control utilizes single chip ICs.

•Built in Twin Tuner system.

•Built-in HYPER-SURROUND system.

•Built-in BBE.

•Adoption of the Picture-In-Picture (PIP) function.

•3 LINE DIGITAL COMB FILTER circuit improved picture quality.

IC702

E2PROM 4k bit

IC701

MAIN MICON

IF2

SCL 1 SDA 1

SCL 0 SDA 0

AFC 2

AFC 1

Remote

control

unit

IC301

PIP

CONTROL

IC001

MTS, TONE

SURROUND CONTROL

TU001

TUNER 1

TU001

TUNER 2

IC101

1 CHIP

CONTROL

IC501

AVSW

CONTROL

•Component input terminal for talking best advantage of Component

Video Signal.

•Audio Video input terminal. (S-input ×2, V-input ×2)

•Variable audio output terminal.

•Closed-caption broadcasts can be viewed.

•With AV COMPU LINK EX terminal.

aSYSTEM BLOCK DIAGRAM

AV-27D502

6 No. 51797

MAIN DIFFERENCE LIST

HOW TO IDENTIFY MODELS

Model

Part name AV-27D502/R AV-27D502/S

MAIN PWB SAC-1507A-M2 SAC-1506A-M2

CRT SOCKET PWB SAC-3507A-M2 SAC-3506A-M2

!PICTURE TUBE A68ADT25X01 A68QDN891X001

!

Model

Part name AV-27D502/R AV-27D502/S

!RATING LABEL LC31139-001A-A

!

------------------------------------------------------------------------------------------------

The difference between AV-27D502/R and AV-27D502/S is in the PICTURE TUBE.

As the result of the difference in PICTURE TUBE, the MAIN PWB also differ.

INDICATED AV-27D502

INDICATED “R”

INDICATED AV-27D502

INDICATED “S”

AV-27D502

No. 51797 7

FUNCTIONS

aREAR PANEL

aFRONT PANEL

aREMOTE CONTROL UNIT

(RM-C301G-2A)

POWER

DISPLAY

SLEEP TIMER

LIGHT

BBE

CHANNEL

VIDEO STATUS

SOURCE FREEZE

PIP

SWAP

ON/MOVE

INPUT

1

7

4

100+

3

9

6

RETURN+

MUTING

MENU

V CHIP

PIP OFF

EXIT

2

8

0

5

+

CH

VOL VOL

+

CH

REC STOP PAUSE

PLAY FFREW

TV

CATV DVD

VCR

VCR CHANNEL

TV/VCR

VCR/DVD

POWER

PREV NEXT

OPEN/CLOSE STILL/PAUSE

RM-C301G

HYPER SURROUND

TV

aFRONT PANEL DOOR OPENED

MENU

CHANNEL

OPERATE

POWER

ON TIMER

VOLUME

INPUT3

VIDEO

INPUT3 VIDEO/AUDIO TERMINAL

L/MONO-AUDIO-R

AV-27D502

8 No. 51797

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power supply cord.

2. Remove the 12 screws marked A as shown in Fig.1.

3. Withdraw the REAR COVER toward you.

[CAUTION]

•When reinstalling the rear cover, carefully push it inward after in-

serting the MAIN PWB into the rear cover groove.

REMOVING THE CHASSIS

•After removing the rear cover.

1. Slightly raise the both sides of the chassis by hand and remove the

3 claws marked B under the chassis from the front cabinet as

shown in Fig.1.

2. Withdraw the chassis backward along the rail in the arrow direction

marked C as shown in Fig.1.

(If necessary, take off the wire clamp, connector’s etc.)

*When conducting a check with power supplied, be sure to confirm

that the CRT earth wire is connected to the CRT SOCKET PWB

and the MAIN PWB.

REMOVING THE TERMINAL BOARD

•After removing the rear cover.

1. Remove the 4 screws marked D as shown in Fig.1.

2. When you pull out the TERMINAL BOARD in the direction of arrow

marked E as shown in Fig.1, it can be removed.

REMOVING THE FRONT CONTROL AND FRONT AV

INPUT PW BOARDS

•After removing the rear cover and chassis.

1. Remove the 3 screws marked F and the 2 screws marked J as

shown in Fig.1.

2. Then remove the FRONT CONTROL PWB and FRONT AV INPUT

PWB.

(If necessary, take off the wire, connector’s etc.)

REMOVING THE LF PW BOARD

•After removing the rear cover and chassis.

1. Lift the left side of the LF PWB while pressing the 2 PWB stoppers

marked G in the arrow direction marked H as shown in Fig.1.

2. Then remove the LF PWB.

(If necessary, take off the wire, connector’s etc.)

SPECIFIC SERVICE INSTRUCTIONS

REMOVING THE SPEAKER

•After removing the rear cover.

1. Remove the 4 screws marked K as shown in Fig.1.

2. Withdraw the speaker backward.

3. Follow the same steps when removing the other hand speaker.

CHECKING THE MAIN PW BOARD

1. To check the back side of the MAIN 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 MAIN PW Board.

[CAUTION]

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

tacting with other PW Board.

•Before turning on power, make sure that the CRT earth wire and

other connectors are properly connected.

WIRE CLAMPING AND CABLE TYING

1. Be sure 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-27D502

No. 51797 9

Fig.1

D

A

PWB

STOPPER

PWB

STOPPER

CHASSIS BASE

AV SELECTOR PWB

PIP PWB

MAIN PWB

LF PWB

SPEAKER

CRT SOCKET PWB

FRONT CONTROL

PWB

FRONT AV INPUT PWB

PICTURE TUBE

REAR COVER

FRONT CABINET

(x12)

(x4)

K(x4)

F

J(x2)

(x3)

E

HC

CLAW

B

G

AV-27D502

10 No. 51797

MEMORY IC REPLACEMENT

1. Memory IC

This model use a memory IC.

This memory IC stores data for proper operation of the video and deflection circuits.

When replacing, be sure to use an IC containing this (initial value) data.

2. Memory IC replacement procedure

Procedure Screen display

(1) Power off

Switch off the power and disconnect the power cord from the outlet.

(2) Replace the memory IC

Initial value must be entered into the new IC.

(3) Power on

Connect the power cord to the outlet and switch on the power.

(4) System constant check and setting

1) Press SLEEP TIMER key and, while the indication of “SLEEP TIMER

0 MIN.”is being displayed, press DISPLAY key and VIDEO STATUS

key on the remote control unit simultaneously.

2) The SERVICE MENU screen of Fig.1 is displayed.

3) While the SERVICE MENU is displayed, again simultaneously press

the DISPLAY and VIDEO STATUS keys to display the Fig.2 SYSTEM

CONSTANT screen.

4) Refer to the SYSTEM CONSTANT table and check the setting items.

Where these differ, select the setting item with the MENU UP/DOWN

key and adjust the setting with the MENU LEFT/RIGHT keys. (The

letters of the selected item are displayed in yellow.)

5) After adjusting, release the MENU LEFT/RIGHT key to store the

setting value.

6) Press the EXIT key twice to return the normal screen.

(5) Receive channel setting

Refer to the OPERATING INSTRUCTIONS(USER'S GUIDE) and set the

receive channels (Channels Preset) as described.

(6) User settings

Check the user setting items according to Table 2.

Where these do not agree, refer to the OPERATING INSTRUCTIONS (US-

ER'S GUIDE) and set the items as described.

(7) SERVICE MENU setting

Verify what to set in the SERVICE MENU, and set whatever is

necessary.(Fig.1) Refer to the SERVICE ADJUSTMENT for setting.

Fig.1

Fig.2

SERVICE MENU

PICTURE SOUND

THEATER OTHERS

PIP

LOW LIGHT HIGH LIGHT

RF AFC1 RF AFC2

VCO(CW) I2C BUS CTRL

SELECT BY

OPERATE BY

EX

IT

EXIT BY

SYSTEM CONSTANT

MODEL : 99–99999

PURITY : NO

CCD : YES

V-CHIP : YES

CAN V-CHIP : YES

999999999 999

SELECT BY

OPERATE BY

EX

IT

EXIT BY

AV-27D502

No. 51797 11

TABLE 1 (System Constant setting)

Setting item Setting content Setting value

YES NO

MODEL AV-27D502

TABLE 2 (User setting value)

Setting item Setting value

1. Use remote controller keys

POWER OFF

CHANNEL CH-02

VOLUME 5

INPUT TV

HYPER SURROUND OFF

BBE ON

DISPLAY OFF

SLEEP TIMER 0

VIDEO STATUS CHOICE

PIP SOURCE CH-04

PIP ON (PIP POSITION) LEFT LOWR SIDE

2. Setting of MENU

PICTURE ADJUST

TINT CENTER

COLOR CENTER

PICTURE CENTER

BRIGHT CENTER

DETAIL CENTER

NOISE MUTING ON

SET VIDEO STATUS ALL CENTER

SOUND ADJUST

BASS CENTER

TREBLE CENTER

BALANCE CENTER

MTS STEREO

CLOCK/TIMERS

SET CLOCK Unnecessary to set

ON/OFF TIMER NO

INITIAL SETUP

TV SPEAKER ON

COMPONENT-IN NO

LANGUAGE ENG

CLOSED CAPTION OFF

AUTO TUNER SETUP TUNER MODE: AIR

CHANNEL SUMMARY Unnecessary to set

V-CHIP OFF

SET LOCK CODE Unnecessary to set

AV-27F802 AV-32F802 AV-36F802 AV-27F702 AV-32F702

AV-36D502 AV-32D502 AV-27D502 AV-36F702

AV-32D302 AV-36D302 AV-32D202 AV-36D202

AV-36230 AV-32230 AV-36260 AV-32260 AV-27260

CAN V-CHIP

V-CHIP

YES

PURITY

CCD

YES NO

YES

NO

AV-27D502

12 No. 51797

SERVICE ADJUSTMENTS

ADJUSTMENT PREPARATION:

1. You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment equipment 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 the 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, capacitors, etc.

7. Presetting before adjustment.

Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit.

VIDEO STATUS STANDARD

HYPER SURROUND OFF

BASS, TREBLE, BALANCE CENTER

TINT, COLOR, PICTURE, CENTER

BRIGHT, DETAIL

MEASURING INSTRUMENT

1. DC voltmeter(or digital voltmeter)

2. Oscilloscope

3. Signal generator ( Pattern generator ) [NTSC]

4. Remote control unit

5. TV audio multiplex signal generator

6. Frequency counter

7. Resistor (1MØ)

ADJUSTMENT ITEMS

•Check of B1 POWER SUPPLY

•RF AGC adjustment

•FOCUS adjustment

•WHITE BALANCE adjustment

WHITE BALANCE (Low Light) adjustment

WHITE BALANCE (High Light) adjustment

PIP HIGH LIGHT WHITE BALANCE Adjustment

•BRIGHT adjustment

SUB BRIGHT adjustment

•CONTRAST adjustment

SUB CONTRAST adjustment

•DEFLECTION adjustment

V CENTER and TRAPEZIUM adjustment

V-SIZE and V-LINEARITY adjustment

H POSITION adjustment

PIP DISPLAY POSITION adjustment

•CHROMA adjustment

SUB COLOR adjustment

SUB TINT adjustment

•User mode setting position

•MTS circuit adjustment

INPUT LEVEL check

STEREO VCO adjustment

SAP VCO adjustment

FILTER check

SEPARATION adjustment

AV-27D502

No. 51797 13

ADJUSTMENT LOCATIONS

LINE FILTER

PWB

FRONT FRONT

FRONT

TOP

FRONT

TOP

CRT SOCKET PWB

(SOLDER SIDE)

PIP PWB

AV SELECTOR PWB

MAIN PWB

FRONT FRONT

POWER

FRONT CONTROL PWB FRONT AV INPUT PWB

VOL CH MENU

007 006

TP-E

TP-R

TP-B

TP-G

CN005

CN004

E2

P

E3

F901

125V 5A

CN005

CN002

CN001

PW

CN004

S1

UPPER : FOCUS

LOWER : SCREEN

MPX

HV

E1

P

CN003

CN002 CN001

J501

SS

CN006 CN007

IC702

IC701 CPU

DEG

TU001

J601

R507

Q511

Heatsink

J502

J503

CN003

TU001

AV-27D502

14 No. 51797

BASIC OPERATION OF SERVICE MENU

1. TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

2. SERVICE MENU ITEMS

In general, basic setting (adjustments) items or verifications are performed in the SERVICE MENU.

•PICTURE ............................... This sets the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION circuits.

•SOUND .................................. This sets the setting values (adjustment values) of the AUDIO circuit.

•THEATER .............................. This is used when the THEATER MODE is adjusted.

•OTHERS ................................ This is used when the OTHERS MODE is adjustment.

•PIP ......................................... This sets the setting values (adjustment values) of the PIP circuit.

•LOW LIGHT ........................... This sets the setting values (adjustment values) of the WHITE BALANCE circuit.

•HIGH LIGHT .......................... This sets the setting values (adjustment values) of the WHITE BALANCE circuit.

•RF AFC1 ................................ This is used when the RF AFC1 MODE is verified. [Do not adjust]

•RF AFC2 ................................ This is used when the RF AFC2 MODE is verified. [Do not adjust]

•VCO (CW) .............................. This is not used for service.

•I2C BUS CTRL ...................... This is used when ON/OFF of the I2C BUS CTRL is set. [Fixed ON]

3. Basic Operations of the SERVICE MENU

(1) How to enter the SERVICE MENU.

Press SLEEP TIMER key and, while the indication of “SLEEP TIMER 0 MIN.”is being displayed, press DISPLAY key and VIDEO STATUS

key on the remote control unit simultaneously to enter the SERVICE MENU screen 1shown in the next figure page.

(2) SERVICE MENU screen selection

Press the UP / DOWN key of the MENU to select any of the following items.

(The letters of the selected items are displayed in yellow.)

•PICTURE •SOUND

•THEATER •OTHERS

•PIP

•LOW LIGHT •HIGH LIGHT

•RF AFC1 •RF AFC2

•VCO(CW) •I2C BUS CTRL

(3) Enter the any setting ( adjustment ) mode

•PICTURE, SOUND and OTHERS mode

1) If select any of PICTURE, SOUND or OTHERS items, and the LEFT / RIGHT key is pressed from SERVICE MENU ( MAIN MENU ), the

screen 2 will be displayed as shown in figure page later.

2) Then the UP / DOWN key is pressed, the PICTURE mode screen 3 or the SOUND mode screen 4 or the OTHER mode screen 5 is

displayed, and the PICTURE, SOUND or OTHERS setting can be performed.

•PIP mode

1) If select the PIP item, and the LEFT/RIGHT key is pressed from SERVICE MENU (MAIN MENU), the screen 6 will be displayed as shown

in figure page later.

2) Then the UP/DOWN key is pressed, the PIP mode screen 7 is displayed, and the PIP setting can be performed.

•THEATER, LOW LIGHT, HIGH LIGHT, RF AFC1, RF AFC2, VCO(CW) and I2C BUS CTRL mode

1) If select any of THEATER / LOW LIGHT / HIGH LIGHT / RF AFC1 / RF AFC2 / VCO (CW) / I2C BUS CTRL items, and the LEFT / RIGHT

key is pressed from SERVICE MENU ( MAIN MENU ), the screens 8 9 10 11 12 13 14 will be displayed as shown in figure page

later.

2) Then the settings or verifications can be performed.

AV-27D502

No. 51797 15

SERVICE MENU

PICTURE SOUND

THEATER OTHERS

PIP

LOW LIGHT HIGH LIGHT

RF AFC1 RF AFC2

VCO(CW) I2C BUS CTRL

SELECT BY

OPERATE BY EX

IT

SERVICE MENU (MAIN MENU) SCREEN PICTURE MODE

EXIT BY

SELECT BY EX

IT

EXIT BY

1. BRIGHT

STATUS

999

99999999

1. NOISE DET.

STATUS

999

99999999 1. OSD POS. 999

SOUND MODE OTHERS MODE

1. PIP BR

STATUS

999

99999999

HIGH LIGHT MODE

SCREEN PIP MODE

EX

IT

EXIT BY

SELECT BY

TOO HIGH GOOD TOO LOW

RF AFC1 ON

FINE 999

SELECT BY

OPERATE BY EX

IT

RF AFC1 MODE

[DO NOT ADJUST]

RF AFC2 MODE

[DO NOT ADJUST]

I2C BUS CTRL MODE

[FIXED ON]

EXIT BY

TOO HIGH GOOD TOO LOW

RF AFC2 ON

FINE 999

HIGH LEVEL

REFERENCE LEVEL

LOW LEVEL

SYNC : YES

SELECT BY

OPERATE BY EX

IT

EXIT BY

I2C BUS ON

SELECT BY

OPERATE BY EX

IT

EXIT BY

THEATER MODE (1/2) THEATER MODE (2/2)

TINT 999 B CUT. 999

COLOR 999 R DRIVE 999

PICTURE 999 B DRIVE 999

BRIGHT 999 DC REST. 999

DETAIL 999 BLK ST. 999

R CUT. 999 GMM PNT 999

G CUT. 999

PAGE 1/2

EX

IT

EXIT BY

SELECT BY

OPERATE BY

CD MAT. 99 CMP CD M 99

RY GAIN 99 CMP RY G 99

GY PHASE 99 CMP GY P 99

CORING 99 CMP COR 99

PAGE 2/2

EX

IT

EXIT BY

SELECT BY

OPERATE BY

BRIGHT

LOW LIGHT MODE

999 999

999

HIGH LIGHT

999 999

23

1

10

11

45

67

8

12

VCO (CW) MODE

[DO NOT USE]

13

14

9

AV-27D502

16 No. 51797

(4) Setting method

1) UP / DOWN key of the MENU

Select the SETTING ITEM.

2) LEFT / RIGHT key of the MENU

Setting (adjust) the SETTING VALUE of the SETTING ITEM.

When the key is released the SETTING VALUE will be stored (memorized).

3) EXIT key

Returns to the previous screen.

(5) Releasing SERVICE MENU

1) After returning to the SERVICE MENU upon completion of the setting (ad-

justment) work, press the EXIT key again.

¤The settings for LOW LIGHT and HIGH LIGHT are described in the WHITE BAL-

ANCE page of ADJUSTMENT.

1. BRIGHT

STATUS

999

99999999

SETTING ITEM

INITIAL

SETTING VALUE

(Adjust)

SETTING VALUE

PICTURE MODE

AV-27D502

No. 51797 17

INITIAL SETTING VALUE OF SERVICE MENU

1. Adjustment of the SERVICE MENU is made on the basis of the initial setting values; however, the new setting values which set the

screen in its optimum condition may differ from the initial setting.

2. Do not change the initial setting values of the setting (Adjustment) items not listed in “ADJUSTMENT”.

•PICTURE MODE

The four setting items in the video mode No.6 EXT BRI., No.7 EXT PIC., No.8 EXT COL. and No.9 EXT TINT are linked to the items in the TV

MODE No.1 BRIGHT, No.2 PICTURE, No.3 COLOR and No.4 TINT, respectively. When the setting items in the TV mode are adjusted, the

values in the setting items in the video mode are revised automatically to the same values in the TV mode.(The initial setting values given in ( )

are off-set values.)

When the four items (No.6, 7, 8 and 9) are adjusted in the video mode, the setting values in each item are revised independently.

No. Setting (Adjustment) item Variable range Initial setting value

1 BRIGHT 000 —127 063

2 PICTURE 000 —127 080

3 COLOR 000 —127 072

4 TINT 000 —127 065

5 TV DETAIL 000 —063 045

6 EXT BRIGHT ±025 ±001

7 EXT PICT. ±025 ±002

8 EXT COLOR ±025 ±002

9 EXT TINT ±025 –004

10 EXT DETAIL 000 —063 045

11 CMP BRIGHT ±025 –003

12 CMP PICT. ±025 +006

13 CMP COLOR 000 —127 080

14 CMP TINT 000 —127 068

15 CMP DETAIL 000 —063 050

16 CMP R CUT ±025 –011

17 CMP G CUT ±025 ±000

18 CMP B CUT ±025 –001

19 CMP R DRV ±025 ±000

20 CMP B DRV ±025 ±000

21 WPL 000 / 001 001

22 B. B. SW 000 / 001 000

23 C TRAP 000 / 001 000

24 CORING 000 / 001 000

25 CMP CORING 000 / 001 001

26 TV SHARPF 000 / 001 001

27 EXT SHARPF 000 / 001 001

28 CMP SHARPF 000 / 001 001

29 RGB CONT 000 —063 031

30 TV ID SENS 000 / 001 000

31 EXT ID SEN 000 / 001 001

32 F ID 000 / 001 000

33 Y MUTE 000 / 001 000

34 AUDIO ATT 000 —127 127

35 SUB CONT 000 —015 008

AV-27D502

18 No. 51797

No. Setting (Adjustment) item Variable range Initial setting value

36 R Y GAIN 000 / 001 001

37 CMP R Y GA 000 / 001 001

38 G Y PHASE 000 / 001 000

39 CMP G Y PH 000 / 001 000

40 CD MATRIX 000 —003 003

41 CMP CD MAT 000 —003 002

42 BLACK ST 000 —003 001

43 DC REST 000 —003 001

44 COLOR GMM 000 / 001 000

45 UV/CBCR 000 / 001 001

46 AT FLESH 000 / 001 000

47 ABL GAIN 000 —003 000

48 ABL ST PNT 000 —003 003

49 RGB ABCL 000 / 001 001

50 TV BPF TOF 000 / 001 000

51 EXT BPF TOF 000 / 001 000

52 GMM PNT 000 —003 003

53 SVM GAIN 000 —003 003

54 CMP SVM GA 000 —003 003

55 SVM PHASE 000 / 001 000

56 AUDIO SW 000 / 001 000

57 BUZZ 000 / 001 000

58 IF FREQ 000 / 001 000

59 RF AGC 000 —063 045

60 AFT MUTE 000 / 001 000

61 AFT SENS 000 / 001 001

62 R/G DRV SW 000 / 001 001

63 BLK SW 000 / 001 000

64 V S COR 000 —015 012

65 V LIN 000 —015 007

66 V SIZE 000 —127 074

67 V AGC 000 / 001 000

68 V CENTER 000 —063 053

69 TV AFC 000 —003 000

70 EXT AFC 000 —003 002

71 V POSI 000 —007 000

72 H POSI 000 —031 016

73 H SIZE 000 —063 023

74 TV V FREQ 000 —003 000

75 EXT V FREQ 000 —003 003

76 SIDE PIN 000 —063 027

77 STAND BY 000 / 001 000

78 TRAPEZ 000 —063 035

79 V RAMP REF 000 / 001 001

80 V 48HZ 000 / 001 000

81 V EHT 000 —007 000

82 TOP PIN 000 —031 010

AV-27D502

No. 51797 19

83 H EHT 000 —007 000

84 BTM PIN 000 —031 012

85 V BLK LOW 000 —003 000

86 V BLK UP 000 —003 000

87 CAPTION IN 000 / 001 000

88 H BLK 000 / 001 000

89 SCREEN 000 / 001 000

90 ACB SW 000 / 001 000

91 ACB PULSE 000 —015 007

92 OVER MODU 000 / 001 001

93 APACON LIM 000 / 001 001

94 TEST 000 —255 128

95 RF S/N TY 000 —002 002

96 EXT S/N TY 000 —002 002

97 RF SN YC E 000 —255 005

98 RF SN YC F 000 —255 016

99 RF SN YC G 000 —063 032

100 RF SN YC H 000 —255 025

101 EX SN YC E 000 —255 005

102 EX SN YC F 000 —255 016

103 EX SN YC G 000 —063 032

104 EX SN YC H 000 —255 025

105 RF SN VC 1 000 —063 000

106 RF SN VC 2 000 —063 007

107 RF SN VC 3 000 —063 014

108 RF SN VC 4 000 —063 021

109 EX SN VC 1 000 —063 000

110 EX SN VC 2 000 —063 007

111 EX SN VC 3 000 —063 014

112 EX SN VC 4 000 —063 021

113 COR LEVEL 000 —003 003

114 VNR CHK 000 —255 003

115 YC SN TIME 000 —255 005

116 VC SN TIME 000 —255 005

117 VM DATA A ±127 +008

118 VM DATA B ±127 –004

119 VM DATA C ±127 –016

120 VM DATA D 000 / 001 000

121 VC SN STOP 000 —255 010

122 CH MUTE 00/001 000

123 VM OFF TY 000/001 000

124 VC VM OFF 000/001 001

125 YC VM OFF 000 —255 255

126 F LOCK 000 —002 002

127 VF LOCK EX 000/001 000

128 PURI RGB 000 —063 031

129 PURI BCK 000/001 000

No. Setting (Adjustment) item Variable range Initial setting value

AV-27D502

20 No. 51797

No. Setting (Adjustment) item Variable range Initial setting value

1 NOISE DET. 000 / 001 001

2 IN LEVEL 000 —063 025

3 FH MONITOR 000 / 001 000

4 STEREO VCO 000 —063 030

5 PILOT CAN. 000 / 001 000

6 FILTER 000 —063 030

7 LOW SEP. 000 —063 028

8 HI SEP. 000 —063 025

9 5FH MON. 000 / 001 000

10 SAP VCO 000 —063 003

11 IN GAIN 000 / 001 000

12 FIL. OFFSET ±010 ±000

13 BBE BASS ±010 +003

14 BBE TRE ±010 +003

•SOUND MODE

Setting (Adjustment) item Variable range Initial setting value

TINT ±20 –06

COLOR ±20 –03

PICTURE ±50 –15

BRIGHT ±20 ±00

DETAIL ±20 +03

R CUT. ±20 ±00

G CUT. ±20 ±00

B CUT. ±20 ±00

R DRIVE ±99 +07

B DRIVE ±99 –25

DC REST. 00 —03 01

BLK ST. 00 —03 00

GMM PNT 00 —03 01

CD MATRIX 00 —03 01

RY GAIN 00 / 01 01

GY PHASE 00 / 01 00

CORING 00 / 01 01

CMP CD M 00 —03 01

CMP RY G 00 / 01 01

CMP GY P 00 / 01 00

CMP COR 00 / 01 01

•THEATER MODE

JVC AV-27D502/R User manual

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