JVC AV-16N8 Manuel utilisateur

AV-16N8

No. 56094 1

CONTENTS

■SPECIFICATIONS ........................................................................................................................... 2

■SAFETY PRECAUTIONS ................................................................................................................ 3

■FEATURES ...................................................................................................................................... 4

★OPERATING INSTRUCTIONS (APPENDED).............................................................................. 1-1

■SPECIFIC SERVICE INSTRUCTIONS ............................................................................................ 4

■SERVICE ADJUSTMENTS............................................................................................................10

★STANDARD CIRCUIT DIAGRAM (APPENDED) ......................................................................... 2-1

■PARTS LIST................................................................................................................................... 27

BASIC CHASSIS

CL-M

AV-16N8

Sep. 2000

−

SERVICE MANUAL

COLOUR TELEVISION

AV-16N8(VT)

AV-16N8

No. 560946

SYSTEM CONSTANT - I

SYSTEM CONSTANT SET 1/3

SYSTEM CONSTANT - II

SYSTEM CONSTANT SET 2/3

−/+: OPERATE DISP : EXIT

− / + : OPERATE DISP : EXIT

11. LANGUAGE : E/V

12. TUNER : MU

13. AMP TUNER : YES

14. VNR : NO

SYSTEM CONSTANT - III

SYSTEM CONSTANT SET 3/3

− / + : OPERATE DISP : EXIT

Fig. 2

a: SELECT

6. SPATIALIZER : YES

7. VOL. LIMITER : YES

8. B/B SOUND : NO

9. TEXT : NO

10. COLOUR AUTO : NO

1. INCH : 21

2. COLOUR : MULTI

3. VIDEO INPUT : 1

4. ECO SENSOR : YES

5. SUPER BASS : NO

REPLACEMENT OF MEMORY IC

1. MEMORY IC

This TV uses the following memory IC.

Memory IC: IC1702 on MAIN PW Board

The memory IC memorizes data for correctly operating the

video and deflection circuits. When replacing the memory IC,

be sure to use the same type IC written with the initial values

of data. In other words, use the specific IC listed in "PRINTED

WIRING BOARD PARTS LIST". For its mounting location, re-

fer to "ADJUSTMENT LOCATIONS".

2. PROCEDURE FOR REPLACING MEMORY IC

(1) Power off

Switch the power off and unplug the power cord from the

wall outlet.

(2) Replacing the memory IC

Replace the memory IC with new one. Be sure to use the

memory IC 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 setting of SYSTEM CONSTANT SET:

1) Press the DISPLAY key and the PICTURE MODE key

on the remote control unit simultaneously.

The SERVICE MENU screen will be displayed. (See

Fig. 1.)

2) In the SERVICE MENU, press the DISPLAY key and

PICTURE MODE key simultaneously. Then, the SYS-

TEM CONSTANT SET screen will be displayed. (See

Fig. 2.)

3) Check whether thesetting values ofthe SYSTEM CON-

STANT SET are the same as those indicated in Table

1. If the value is different, select the setting item with

the MENU akey, and set the correct value with

the MENU −/ +key.

4) Press the DISPLAY key twice to return to the normal

screen.

(5) Receive channel setting

Refer to the OPERATING INSTRUCTIONS and set the

receive channels (channels preset).

(6) User setting

Check the user setting values in 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 for each setting item in the SERVICE

MENU. (See Table 3.) If readjustment is necessary, per-

form adjustment referring to "SERVICEADJUSTMENTS".

Fig. 1

SERVICE MENU

1. IF

3. VSM PRESET 2.V/C

SERVICE MENU

1-3 : SELECT DISP : EXIT

✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

AV-16N8

No. 56094 7

DISPLAY POWER

−

LIVE

SPATIAL

CHANNEL VOLUME

SYSTEM

COLOUR SOUND MUTING

PICTURE MODE

RETURN+

ECO SENSOR OFF TIMER

123

456

-/--

RM-C234 REMOTE CONTROL UNIT

PICTURE

MODE

DISPLAY

−

TV/VIDEO

CHANNEL SCAN

PICTURE

BOOSTER

NAME OF REMOTE CONTROL KEYS

Setting item Setting contents Setting value

1. INCH 21

2. COLOUR MULTI

3. VIDEO INPUT 1

4. ECO SENSOR YES

5. SUPER BASS NO

6. SPATIALIZER YES

7. VOL. LIMITER YES

8. B/B SOUND NO

9. TEXT NO

10. COLOUR AUTO NO

11. LANGUAGE E/V

12. TUNER MU

13. AMP TUNER YES

14. VNR NO

SETTING OF SYSTEM CONSTANT SET Table 1

29 25 21 14

MULTI. TRIPLE PAL

YES NO

E E/V

MU MA

YES NO

Setting item Setting value Setting item Setting value

SUB POWER ON BASS CENTER

CHANNEL POSITION 1 POSITION BALANCE CENTER

CHANNEL PRESET Refer to OPERATING INSTRUCTION. OFF TIMER OFF

VOLUME Appropriate sound volume AUTO SHUTOFF OFF

TV/VIDEO TV ECO SENSOR OFF

ON SCREEN DISPLAY POSITION NUMBER DISPLAY LANGUAGE VIETNAMESE

COLOUR SYSTEM PAL BLUE BACK OFF

SOUND SYSTEM B / G ON TIMER PR1 0:00

PICTURE MODE (VSM) BRIGHT CHILD LOCK OFF

LIVE SPATIAL OFF PICTURE BOOSTER OFF

TREBLE CENTER

USER SETTING VALUES

Table 2

AV-16N8

No. 560948

Service menu Setting item

1. IF 1. VCO

2. DELAY POINT

2. V / C 1. CUTOFF(R/G/B)

2. DRIVE(R/B)

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT (TV/VIDEO)

7. BLACK OFFSET(R-Y/B-Y)

8. SHARP

9. TEXT(RGB)CONT.

10. H. CENTER

11. V. HEIGHT

12. V. LIN

13. V.S-CR

14. V. CENTER

15. AMP T. SHARP

SERVICE MENU SETTING ITEMS

Table 3

Service menu Setting item

3. VSM PRESET TINT

(BRIGHT/STD/SOFT) COLOUR

BRIGHT

CONT.

SHARP

Do not adjust.

AV-16N8

No. 5609410

SERVICE ADJUSTMENTS

BEFORE STARTING SERVICE ADJUSTMENT

MEASURING INSTRUMENT

AND FIXTURES

1. DC voltmeter (or Digital voltmeter)

2. Oscilloscope

3. Signal generator (Pattern generator)

[PAL / SECAM / NTSC]

4. Remote control unit

1. There are 2 ways for 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 con-

dition can be different from the initial setting values.

3. Make sure thatconnection is correctlymade toAC powersource.

4. Turnonthe power of theTV and measuring instrument forwarm-

ing up for at least 30 minutes before starting adjustment.

5. If the receive or input signal is not specified, use the most ap-

propriate signal for adjustment.

6. Never touch parts (such as variable resistors, transformers and

capacitors) 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.

BASIC OPERATION IN 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:

●1. IF ............................. For entering/adjusting the setting values (adjustment values) of the IF circuit.

●2. V/C........................... For entering/adjusting the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION cir-

cuits.

●3. VSM PRESET ......... For setting the values of STANDARD, SOFT and BRIGHT

(VSM: video status memory)

ADJUSTMENT/CHECK ITEMS

Adjustment/Check item Page

B1 POWER SUPPLY Check 14

FOCUS Adjustment 14

IF CIRCUITAdjustment 14

V/C (VIDEO/CHROMA) CIRCUITAdjustment 15

DEFLECTION CIRCUIT Adjustment 21

VSM PRESET Adjustment 23

PURITY, CONVERGENCE Adjustment 24

Function

PICTURE MODE (VSM)

COLOUR/BRIGHT/CONT./SHARP

OFF TIMER

ECO SENSOR

BLUE BACK

PICTURE BOOSTER

Setting value

BRIGHT

See "VSM Preset"

on page 23.

OFF

AV-16N8

No. 56094 11

3. BASIC OPERATION IN SERVICE MENU

(1) How to enter SERVICE MENU

Press the DISPLAY key and the PICTURE MODE key on

the remote control unit simultaneously.

The SERVICE MENU screen will be displayed. (See Fig. 1.)

(2) Selection of SUB MENU SCREEN

Press one of the keys 1 ~ 3 on the remote control unit, and

select the SUB MENU SCREEN from the SERVICE MENU.

(See Fig. 2.)

SERVICE MENU →SUB MENU 1. IF

2. V / C

3. VSM PRESET

Fig. 1

SERVICE MENU

1. IF

3. VSM PRESET 2.V/C

SERVICE MENU

1-3 : SELECT DISP : EXIT

✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

SUB MENU SCREEN

Fig. 2

SERVICE MENU

BRIGHT

✽✽

SUB MENU 3.VSM PRESET

a: SELECT

− / + : OPERATE DISP : EXIT

BRIGHT / STD / SOFT

Setting item

TINT

COLOUR

BRIGHT

CONT.

SHARP

1.VCO

2. DELAY POINT

1-2 : SELECT DISP : EXIT

SUB MENU 1. IF

VCO (CW)

✽✽✽.✽✽ MHz

TOO HIGH

ABOVE REFERENCE

BELOW REFERENCE

TOO LOW

DISP : EXIT

DELAY POINT

AGC TAKE-OVER

✽✽

−/+: OPERATE DISP : EXIT

Setting item

1. CUTOFF(R/G/B)

2. DRIVE(R/B)

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT (TV/VIDEO)

7. BLACK OFFSET(R-Y/B-Y)

8. SHARP

9. TEXT(RGB)CONT.

10. H. CENTER

11. V. HEIGHT

12. V. LIN

13. V.S-CR

14. V. CENTER

15. AMP T. SHARP

Setting item

PAL

1. CUTOFF (R)

✽ ✽✽

(G)

✽ ✽✽

− / + : OPERATE DISP : EXIT

(B)

✽ ✽✽

a: SELECT

V/C

SUB MENU 2.V/C

1. IF

3. VSM PRESET 2.V/C

SERVICE MENU

1-3 : SELECT DISP : EXIT

✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

50Hz

TINT

COLOUR

BRIGHT

CONT.

SHARP

AV-16N8

No. 5609412

(3) Method of Setting

*Once the setting values are set, they are memorized automatically.

*It must not adjust without inputting a signal.

1) 1. IF

[1. VCO]

(a) 1 Key ......................................... Select 1. IF.

(b) 1 Key ......................................... Select 1. VCO. (CW)

(c) VCO(CW) TRANSF. .................. Adjust VCO(CW) while watching the colour (yellow/blue) of the characters on the screen.

(d) DISPLAY Key ............................ When this is pressed twice, you will return to the SERVICE MENU.

[2. DELAY POINT]

(a) 1 Key ......................................... Select 1. IF.

(b) 2 Key ......................................... Select 2. DELAY POINT.

(d) DISPLAY Key ............................ When this is pressed twice, you will return to the SERVICE MENU.

2) 2. V/C and 3. VSM PRESET

(a) 2 and 3 Keys ............................. Select 2. V/C and 3. VSM PRESET.

(b) MENU akey........................ Select setting items.

●Use the number keys on the remote control unit for setting of WHITE BALANCE and BLACK

OFFSET. For the setting, refer to each item concerned.

(d) DISPLAY Key ............................ When this is pressed, you will return to the SERVICE MENU.

(4) Release of SERVICE MENU

After completing the setting, return to the SERVICE MENU by pressing the DISPLAY key, then again press the DISPLAY key to return

to the normal screen.

AV-16N8

No. 5609414

Description

1. Receive a whole black signal.

2. Connect a DC voltmeter between TP-91 (B1) and TP-E (")

(between pins 1 and 5 of the connector S1).

3. Make sure that the voltage is DC114.5 ±1.5V.

Description

1. Receive a cross-hatch signal.

2. While watching the screen, adjust the FOCUS VR to make the

vertical and horizontal lines as fine and sharp as possible.

3. Make sure that, when the screen is darkened, the lines remain

in good focus.

Measuring

Item Test point Adjustment part

instrument

Adjustment Remote VCO (CW)

of VCO (CW) control unit TRANSF.

[MAIN PWB]

Description

●Under normal conditions, no adjustment is required.

1. Select 1. IF from the SERVICE MENU.

2. Press the 1key to select 1. VCO.

3. Select a receivable broadcast channel with the CHANNEL key.

4. Turn the core of VCO(CW) TRANSF. until the colour of the

characters "TOO HIGH" displayed on the screen changes from

blue to yellow. (Step 1)

5. Then slowly turn the core of VCO(CW) TRANSF. counterclock-

wiseuntil thecharacters "ABOVEREFERENCE" changes from

blue to yellow. (Step 2)

6. Further slowly turn the core of VCO(CW) TRANSF. until the

colour of the characters "BELOW REFERENCE" changes from

blue to yellow. (Step 3)

7. Press the DISPLAY key three times to return to normal screen.

8. Perform CHANNEL PRESET again, and make sure that each

broadcast is being received properly.

ADJUSTMENTS

B1 POWER SUPPLY

Measuring

Item Test point Adjustment part

instrument

Check of Signal TP-91 (B1)

B1 POWER Generator TP-E (""

SUPPLY [S1

DC Voltmeter connector]

Measuring

Item Test point Adjustment part

instrument

Adjustment Signal FOCUS VR

of FOCUS generator [In HVT]

FOCUS ADJUSTMENT

IF CIRCUIT ADJUSTMENT

Step

Screen display 123

TOO HIGH Yellow Blue Blue

ABOVE REFERENCE Blue Yellow Blue

BELOW REFERENCE Blue Blue Yellow

TOO LOW Blue Blue

TOO HIGH

ABOVE REFERENCE

BELOW REFERENCE

TOO LOW

VCO (CW) ✽✽✽.✽✽ MHz

DISP : EXIT

YELLOW

AV-16N8

No. 56094 15

Colour system Variable Initial setting value

Setting item range PAL SECAM NTSC 3.58 NTSC 4.43

1. CUT OFF (R / G / B) −128 ~ +127 0 b b b

2. DRIVE (R / B) −128 ~ +127 0 b b b

3. BRIGHT −64 ~ +63 −11 b b b

4. CONT. −58 ~ +28 −10 b b b

5. COLOUR −60 ~ +67 +7+11 +12 −2

6. TINT TV / VIDEO −64 ~ +63 +5 / 0 −2 / 0

7. BLACK OFFSET (R-Y / B-Y) −8 ~ +7 0 / 0

8. SHARP TV / VIDEO −32 ~ +31 +5 / +3b b b

9. TEXT (RGB) CONT. −128 ~ +127 +15 b b b

15. AMP T. SHARP −128 ~ +127 −15 b b b

Measuring

Item Test point Adjustment part

instrument

Adjustment Remote DELAY POINT

of DELAY control unit (AGC TAKE-OVER)

POINT

Description

1. Receive a black and white signal (colour off).

2. Select 1. IF from the SERVICE MENU.

3. Select 2. DELAY POINT by pressing the 2key on the remote

control.

4. Adjust the MENU −or +key until video noise disappears.

5. Press the DISPLAY key three times to return to the normal

screen.

6. Turn to other channels and make sure that there are no irregu-

larities.

V/C (VIDEO/CHROMA) CIRCUIT ADJUSTMENT

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.

●Do not change the initial setting values of the setting (adjustment) items not listed in "ADJUSTMENT".

[SUB MENU 2. V/C (1. CUT OFF (R / G / B) ~ 9. TEXT (RGB) CONT. and 15. T. AMP SHARP)]

Setting Variable Initial setting

(Adjustment) range value

item

DELAY POINT 0 ~63 20

(AGC TAKE-OVER)

: Do not adjust.

AV-16N8

No. 5609416

Measuring

Item Test point Adjustment part

instrument

Adjustment ●Signal 1. CUTOFF (R)

of WHITE generator CUTOFF (G)

BALANCE CUTOFF (B)

(Low light) ●Remote

control SCREEN VR

unit (In HVT)

Adjustment ●Signal 2. DRIVE (R)

of WHITE generator DRIVE (B)

BALANCE

(High light) ●Remote

control

unit

Description

1. Receive a black and white signal (colour off).

2. Select 2. V/C from the SERVICE MENU.

3. Select 1. CUTOFF (R), (G) and (B) with MENU akey, and

set each value to initial setting value with 4~9keys on the

remote control unit.

4. Press the 1key on the remote control unit to produce a single

horizontal line.

5. Turn the SCREEN VR fully counterclockwise, then slowly turn

it clockwise to where a red, blue, or green colour is faintly vis-

ible.

6. Use keys 4~9on the remote control unit and adjust the other

2 colours to where the single horizontal line appears white.

7. Turn the SCREEN VR to where the single horizontal line glows

faintly.

8. Press the 2key to return to 1. CUTOFF screen.

9. Press the DISPLAY key twice to return to the normal screen.

1. Receive a black and white signal (colour off).

2. Select 2. V/C from the SERVICE MENU.

3. Select 2. DRIVE (R) / (B) with MENU akey, and set each

value to initial setting value with 4and 7keys, or 6and 9keys

on the remote control unit.

4. Use the keys 4and 7or 6and 9to produce a white screen.

5. Press the DISPLAY key twice to return to the normal screen.

Setting (Adjustment) Variable Initial setting

item range value

R−128 ~+127 0

2. DRIVE B−128 ~+127 0

Setting (Adjustment) Variable Initial setting

item range value

R−128 ~+127 0

1. CUT OFF G −128 ~+127 0

B−128 ~+127 0

PAL

2. DRIVE (R)

✽ ✽✽

(B)

✽ ✽✽

− / + : OPERATE DISP : EXIT

a: SELECT

V/C

50Hz

PAL

1. CUTOFF (R)

✽ ✽✽

(G)

✽ ✽✽

− / + : OPERATE DISP : EXIT

(B)

✽ ✽✽

a: SELECT

V/C

50Hz

R. CUTOFF ( )

G. CUTOFF ( )

H.LINE OFF

H.LINE ON

12 3

789

R. CUTOFF ( )

R. DRIVE ( )

G. CUTOFF ( )

B. CUTOFF ( )

B. DRIVE ( )

B. CUTOFF ( )

B. DRIVE ( )

REMOTE CONTROL UNIT

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