JVC AV28EWEX1EK, AV28WX1, AV28WX1EK, AV28WX1EKA, AV28WX1EP Service manual & schematics

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JVC AV 28WX1 EK

Adjustments Cont’d

5) ZOOM MODE

FULL

6) ROTATION SW [For 32 inch only]

CENTRE (RESET)

MEASUREMENT EQUIPMENT AND FIXTURES

1. DC voltmeter (or digital voltmeter)

2. Oscilloscope

3. Signal generator (Pattern generator) [PAL / NTSC]

4. Remote control unit

ADJUSTMENT ITEMS

• B1 power supply check

• FOCUS adjustment

• IF circuit adjustment

• VSM PRESET setting

• VIDEO / CHROMA circuit adjustment

• DEFLECTION circuit adjustment

• BLANKING adjustment

• AUDIO circuit adjustment (Do not adjust)

• VPS monitor display (Do not adjust)

ADJUSTMENT LOCATIONS- I

REMOTE CONTROL KEYS

Fig. 2

(3) Method of Setting

1) Method of Setting 1. IF [1. VCO] (2) 1 Key. Select l.IF. (2) 1 Key. Select 1.VCO. (3) 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. (4) DISPLAY Key. As you press this twice, you will return to the SERVICE MENU.

[2. DELAY POINT] (1) 1 Key. Select 1.IF. (2) 2 Key. Select 2.DELAY POINT. (3) FUNCTION L/R. Set (adjust) the setting

values of the setting items. (4) OK Key. Memorize the set value. (Before storing the setting values in memory, do not press the CH, TV / VIDEO, DISPLAY, POWER ON / OFF keys - it you do, the values will not be stored in memory.) (5) DISPLAY Key. When this is pressed twice, you will return to the SERVICE MENU.

2) Method of setting 2.V/C, 4.DEF and 5.VSM PRESET.

1) 2, 4, 5 keys.

Select one from 2. V/C, 4. DEF and 5. VSM PRESET.

2) FUNCTION UP/DOWN key. Select setting items.

3) FUNCTION L/R key. Set (adjust) the setting values of the setting items.(When 1 CUT OFF of

2.V/C is selected, press its “L” or “R” key, and the whole screen will change to a faint horizontal line appearing in its center. Press the same “L’ or “R” key again, and the screen will return to the original 1 CUTOFF screen.)

4) OK Key. Memorize the setting value. (Before storing the setting values in memory, do not press the CH, TV / VIDEO, DISPLAY, POWER ON/OFF keys - if you do, the values will not be stored in memory.)

5) DISPLAY Key. Return to the SERVICE MENU screen.

(4) Release of SERVICE MENU

1) After completings the setting, return to the SERVICE MENU, then again press the DISPLAY key.

ADJUSTMENTS Item

B1 power supply check

Measuring instrument

Signal generator DC Voltmeter

Test point

TP-91 TP-E ( )

BASIC OPERATION OF SERVICE MENU

1. TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

2. SERVICE MENU ITEMS

With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings (adjustments):

1) 1. IF

This mode adjusts the data of the IF circuit.

2) 2. V/C

This mode adjusts the data of the VIDEO / CHROMA circuit.

3) 3. AUDIO

This mode adjusts DETECTION LEVEL of the signal for IC of NICAM multiplex broadcast. (Do not adjust).

4) 4. DEF

This mode adjusts the data of DEFLECTION circuit for each aspect mode given.

FULL (50 / 60Hz) 16:9 TOP (50 / 60Hz) 14:9 TOP (50 / 60Hz) REGULAR (50 / 60Hz) PANORAMIC (50 / 60Hz) 16:9 ZOOM (50 / 60Hz) 14:9 ZOOM (50 / 60Hz)

5) 5. VSM PRESET

This mode adjusts the data value of the picture and sound which are called out when CINEMA/ GAME picture status in the FEATURE menu has been selected. (VSM : Video Status Memory)

6) 6. VPS

This mode shows the monitor of the VPS and PDC. (Do not adjust). (VPS : Video Program System, PDC : Program Delivery Code)

7) 7. AUTO PROGRAM

This mode initializes every existing set value collectively to the preset value at the time of shipment from the factory.

3. BASIC OPERATION OF SERVICE MENU

1) How to enter SERVICE MENU

Press the DISPLAY and the STANDARD key of the REMOTE CONTROL UNIT simultaneously (Fig. 2). The SERVICE MENU screen of Fig.1 will be displayed.

2) Selection of SUB MENU SCREEN

1) Press one of the keys 1-7 of the REMOTE CONTROL UNIT, and select the SUB MENU SCREEN (See Fig. 3) from the SERVICE MENU.

SERVICE MENU -> SUB MENU

1. IF

2. V/C

3. AUDIO

4. DEF.

5. VSM PRESET

6. VPS

7. AUTO PROGRAM

Fig. 1

Fig. 3 SUB MENU SCREEN

Description

1. Receive a whole black signal.

2. Connect a DC voltmeter to TP-91 and TPE( ).

3. Make sure that the voltage is DC143.2V ±

2.0V.

FOCUS Adjustment Item

FOCUS Adjustment

Measuring instrument

Signal generator

Adjustment part

FOCUS VR [In HVT]

FOCUS adjustment Description

• Select the ZOOM MODE to FULL.

• Receive a cross-hatch signal.

[AV-28WX1EK]

1. While observing the picture, turn the focus adjusting VR (a handle located at the upper part of HVT) so that the picture is adjusted within the range of an optimum focus position without distinct moire

2. Make sure that when the screen is darkened, the lines remain in good focus.

[AV-32WX1EK]

1. By turning the black VR FOCUS 2, adjust the picture so that the 5th vertical line from the left side of the cross-hatch picture becomes thinnest.

2. By turning the red VR FOCUS 1, adjust the picture so that the 3rd horizontal line from the upper side of the cross-hatch picture becomes uniform at the line center and its periphery.

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JVC AV 28WX1 EK

Adjustments Cont’d

3. Carry out adjustment by repeating the steps 2 and 3.

4. Make sure that when the screen is darkened, the lines remain in good focus.

AV-32WX1EK HVT FOCUS VR IF circuit adjustment SUB MENU 1. IF Item

Adjustment of VCO

Measuring instrument

Remote control unit

Adjustment part

PIF CW [MAIN PWB]

Description

• Do not make any adjustment unless the adjustment is out of way and you cannot get correct picture.

1. Select 1 IF from the SERVICE MENU.

2. Select 1. VCO.

3. Select a receivable broadcast channel.

4. Turn the core of PIF CW transf. until the colour of the characters TOO HIGH displayed on the screen changes from blue to yellow. (The characters indicated by the yellow colour are showing the present value of the AFC voltage.) (Step 1)

5. Turn the core of PIF CW transf. until the colour of the characters TOO HIGH changes TOO LOW.

6. Then slowly turn back the core of PIF CW transf. until the colour of the characters JUST REFERENCE changes from blue to yellow. (Step 3)

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

8. Perform CHANNEL PR again, and make sure that each broadcast is being received properly.

Item

Adjustment of DELAY POINT (AGC)

Measuring instrument

Remote control unit

Adjustment part

DELAY POINT (AGC TAKE-OVER)

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 2 key on the remote control unit.

4. Adjust the FUNCTION L/R key until video noise disappears.

5. Press the OK key and memorize the set value.

6. Turn to other channels and make sure that there are not irregularities.

Setting (adjustment) item

DELAY POINT (AGC TAKE-OVER)

Variable range

0 ~ 63

Initial setting value

VSM PRESET setting SUB MENU 5. VSM PRESET

Item

Setting of VSM PRESET

Measuring instrument

Remote control unit

Adjustment part

1. BRIGHT

2. CONT.

3. COLOUR

4. SHARP

5. TINT

6. R DRIVE

7. G DRIVE

8. B DRIVE

9. BASS

10. TREBLE

Description

1. Select 5.VSM PRESET from the SERVICE MENU.

2. Select STANDARD 1 mode with the STANDARD key.

3. Adjust the FUNCTION UP/DOWN and FUNCTION L/R key to bring the set values of

1.BRIGHT ~ 10. TREBLE to the values shown in the table.

4. Press the OK key and memorize the set value.

5. Select STANDARD 2 mode with the STANDARD key and set the value as same manner.

6. Then exit the SERVICE MENU by pressing the DISPLAY key, and enter to the MENU screen with the OK key.

7. Select the FEATURE item.

8. Select the CINEMA/GAME item, and set the each VSM mode for USER, CINEMA, GAME, and make similar adjustment as in 1 (see opposite).

VIDEO/CHROMA circuit adjustment SUB MENU 2. V/C

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.

Item

Adjustment of WHITE BALANCE (Low light)

Measuring instrument

Signal generator Remote control unit

Adjustment part

R. CUT OFF VR G. CUT OFF VR B. CUT OFF VR [CRT SCT PWB] SCREEN VR [In HVT]

Description

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

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

3. Select l. CUT OFF with the FUNCTION UP/ DOWN key.

4. Shown one horizontal line with the FUNCTION L/R key. With the SCREEN VR, adjust so that the horizontal line will not be too bright.

5. Turn the CUT OFF VR respectively for R, G and B fully to the left (to the left direction

SETTING VALUES OF VSM PRESET

when seen from the rear).

6. Gradually turn the SCREEN VR from the left end to the right direction to bring one of the red, green and blue colours faintly visible.

7. By adjusting the CUT OFF VR, bring out the other 2 colours and make one horizontal line visible in white

8. Turn the SCREEN VR and bring one white horizontal line faintly visible.

9. Turn 1 CUTOFF off.

Item

Adjustment of WHITE BALANCE (High light)

Measuring instrument

Signal generator Remote control unit

Adjustment part

2. R DRIVE

3. G DRIVE

4. B DRIVE (Do not adiust)

Description

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

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

3. Select 2.R DRIVE and 3.G DRIVE with the FUNCTION UP/DOWN key.

4. Change the screen colour to white with the FUNCTION L/R key.

5. Press the OK key, and memorize the respectively set values.

Item

Adjustment of SUB BRIGHT

Measuring instrument

Remote control unit

Adjustment part

5. BRIGHT

Description

1. Receive any broadcast.

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

3. Select 5.BRIGHT with the FUNCTION UP/ DOWN key.

4. Set the initial setting value with the FUNCTION L/R key.

5. If the brightness is not the best with the initial set value, make fine adjustment until you get the best brightness.

6. Press the OK key and memorize the set value.

Item

Adjustment of SUB CONT.

Measuring instrument

Remote control unit

Adjustment part

6. CONT.

1. Receive any bioadcast.

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

3. Select 6.CONT. with the FUNCTION UP/ DOWN key.

4. Set the initial setting value with the FUNCTION L/R key.

5. If the contrast is not the best with the initial set value, make fine adjustment until you get the best contrast.

6. Press the OK key and memorize the set value.

Item

Adjustment of SUB COLOUR I

Measuring instrument

Remote control unit

Adjustment part

7. COLOUR

Description

[Method of adjustment without using measuring equipment]

PAL COLOUR

1. Receive a PAL broadcast.

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

3. Select 7.COLOUR with the FUNCTION UP/ DOWN key.

4. Set the initial setting value for PAL COLOUR with the FUNCTION L/R key.

5. If the colour is not the best with the initial set value, make fine adjustment until you get the best colour.

6. Press the OK key and memorize the set value.

NTSC 3.58 COLOUR

8. Input NTSC 3.58MHz COMPOSITE VIDEO signal from the EXT terminal.

9. Make similar fine adjustment of NTSC 3.58 COLOUR as previously.

NTSC 4.43 COLOUR

When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective values.

Item

Adjustment of SUB COLOUR II

Measuring instrument

Signal generator Oscilloscope Remote control unit

Test Point

TP-47B TP-E( ) [CRT SOCKET PWB]

Adjustment part

7.COLOUR

(PAL~NTSC)

Description

[Method of adjustment using measuring instrument]

Adjustment part

PAL COLOUR

Description

(PAL COLOUR)

1. Receive a PAL full field colour bar signal (75% white).

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

3. Select 5.COLOUR with the FUNCTION UP/ DOWN key.

4. Set the initial setting value of PAL COLOUR with the FUNCTION - or + key.

5. Connect the oscilloscope between TP-47B and TP-E( ).

6. Adjust PAL COLOUR and bring the value of (A) in the illustration to +12V (voltage difference between white (w) and blue (B)).

7. Press the MENU key and memorize the setting value.

Adjustment part

NTSC 3.58 COLOUR

Description

(NTSC 3.58 COLOUR)

1. Input a NTSC 3.58MHz COMPOSITE VIDEO signal (full field colour bar with 75% white) from the EXT terminal.

2. Set the initial setting value of NTSC 3.58 COLOUR with the FUNCTION -/+ key.

3. Adjust NTSC 3.58 COLOUR and bring the value of (A) of the illustration to +8V (W~B).

4. Press the MENU key and memorize the setting value.

(NTSC 4.43 COLOUR)

1. When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective values.

Item

Adjustment of SUB TINT I

Measuring instrument

Remote control unit

Adjustment part

8. TINT

Description

[Method of adjustment without using measuring equipment]

NTSC 3.58 TINT

1. Input COMPOSITE VIDEO signal of NTSC

3.58MHz from the EXT terminal.

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

3. Select 8.TINT with the FUNCTION UP/DOWN key.

4. Set the initial setting value of NTSC 3.58 TINT with the FUNCTION L/R key.

5. It you cannot get the best tint with the initial setting value, make fine adjustment until you get the best tint.

6. Press the OK key and memorize the set value.

NTSC 4.43 TINT When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective values.

Item

Adjustment of SUB TINT II Signal generator Oscilloscope Remote control unit

Test Point

TP-47B TP-E( ) [CRT SCT PWB]

Adjustment Part

8. TINT

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JVC AV 28WX1 EK

Adjustments Cont’d

Description

[Method of adjustment using measuring equipment]

NTSC 3.58 TINT

1. Input COMPOSITE VIDEO signal (full field colour bar 75% white) of NTSC 3.58MHz from the EXT terminal.

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

3. Select 8.TINT with the FUNCTION UP/DOWN key.

4. Set the initial setting value of NTSC 3.58 TINT with the FUNCTION L/R key.

5. Connect the oscilloscope to TP-47B.

6. Adjust NTSC 3.58 TINT to bring the value of (A) of the illustration to 0V (voltage difference between white (W) and magenta (Mg) ).

7. Press the OK key and memorize the setting value.

(NTSC 4.43 TINT) When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the respective values.

[AV-28WX1 EK] INITIAL SETTING VALUE LIST

- Table 1-

Item

Adjustment of VERTICAL SLOPE

Measuring instrument

Signal generator Remote control unit

Adjustment part

1. V-SLOPE V BLK SW

Description

Select the ZOOM MODE to FULL. At that time, if there are any missing sections in the upper and the lower parts of the screen, adjust them by turning the BLK switch in the MAIN PWB in order to obtain an optimal screen with minimum missing sections.

1. Receive a circle pattern signal of vertical frequency 50Hz.

2. Select 4.DEF from the SERVICE MENU.

3. Select 1.V-SLOPE with the FUNCTION UP / DOWN key.

4. Set the initial setting value of V-SLOPE (50Hz mode) with the FUNCTION L / R key.

5. Adjust V-SLOPE and make the screen’s center line and the blanking line coincide.

6. Press the OK key and memorize the set value.

upward and downward directions by 3. VSIZE. (The value within about 5mm is tolerable.)

15.When adjusted in the 50Hz / FULL mode, other mode will be automatically set.

16.Press the OK key and memorize the set value.

[SCREEN SIZE]

Item

Adjustment of H. CENTER

Adjustment part

4. H-CENT

Description

Select the ZOOM MODE to FULL.

1. Receive a circle pattern signal. (fv = 50Hz)

2. Select 4. DEF from SERVICE MENU.

3. Select 4.H-CENT and set the initial setting value.

4. Set H-CENT initial setting value by press the FUNCTION L / R key.

5. Adjust H-CENT to make C = D.

6. Press the OK key and memorize the set value.

REGULAR, 14:9 TOP and 14:9 ZOOM MODE shown between E and F length.

Item

Adjustment of EW-PIN

Adjustment part

6.EW-PIN

Description

• Select the ZOOM MODE to FULL.

1. Receive a cross-hach signal (fv = 50Hz).

2. Select 4.DEF from SERVICE MENU.

3. Select 6.EW-PIN and set the initial setting value.

4. Set EW-PIN initial setting value by press the FUNCTION L / R key.

5. Adjust EW-PIN and make the 2nd vertical lines at the left and right edges of the screen straight. Also make sure that the 2nd vertical lines are also straight.

6. Press the OK key and memorize the set values.

DEFLECTION circuit adjustment SUB MENU

4. DEF

• There is a 14 different adjustments (FULL / 16:9 TOP / 14:9 TOP / REGULAR / PANORAMIC / 16:9 ZOOM & 14:9 ZOOM) to be made by VERTICAL FREQUENCY in total for the adjustment of deflection circuit.

• When the 50Hz / FULL MODE has been established, the setting of other modes will be done automatically. However, of the picture quality has not been optimized, adjust each mode again, respectively.

• 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 set values.

- Table 2[AV-32WX1 EK]

- Table 3-

Item

Adjustment of VERTICAL SHIFT

Adjustment part

2. V-SHIFT

Description

7. Select 2.V-SHIFT and set the initial setting value.

8. Adjust V-SHIFT to make A = B as shown in figure.

9. Press the OK key and memorize the set value.

Item

Adjustment of VERTICAL SIZE

Adjustment part

3. V-SIZE

Description

10.Receive a cross-hatch signal. (fv = 50Hz)

11.Adjust 3.V-SIZE and set the initial setting value.

12.Adjust V-SIZE and make the vertical screen size 92% of the picture size.

13.Press the OK key and memorize the set value.

Item

Adjustment of H. SIZE

Adjustment part

5. H-SIZE

Description

7. Receive a cross-hatch signal. (fv = 50Hz)

8. Select 5.H-SIZE and set the initial setting value.

9. Adjust H-SIZE and make the horizontal screen size 92% of the picture size.

10.Press the OK key and memorize the set value.

11 When adjusted in the 50HZ/FULL mode,

other mode will be automatically set.

12.Press the OK key and memorize the set value.

Item

Adjustment of TRAPEZ

Adjustment part

7. TRAPEZ

Description

7. Select 7.TRAPEZ and set the initial setting value.

8. Adjust TRAPEZ and bring the vertical lines at the right and left edges of the screen in parallel.

9. Press the OK key and memorize the set values.

Item

Adjustment of V-S. CR

Adjustment part

8. V-S.CR

Description

10.Select 8.V-S. CR and set the initial setting values.

11.Adjust V-S. CR and make the gaps between the horizontal lines same.

12.Press the OK key and memorize the set values.

Item

Adjustment of EW-COR

Adjustment part

9. EW-COR

- Table 4-

14.When the deflection of vertical center is more than about 5mm, adjust the picture in the

[SCREEN SIZE]

Description

13.Select 9.EW-COR and set the initial setting values.

14.Adjust EW-COR and make the vertical lines at the four corners of the screen straight.

15.Press the OK key and memorize the set values.

16.When adjusted in the 50HZ/FULL mode, other mode will be automatically set.

17.Make sure that the adjustment is properly done on the screen of 60Hz signal. Also make sure that the adjusted value falls within the tolerance in each ZOOM MODE. If the adjustment has not been done properly, adjust it in the same manner as for above.

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