JVC AV-25SX1 EK Service Manual

1JVC AV-25SX1 EK

Matrix

Item See Model Book

AV Selector PCB.......................................................................... JVC AV-29SX1EK 5

Dolby PCB .................................................................................... JVC AV-29SX1EK 5

Service Mode ............................................................................... JVC AV-29SX1EK 5

E2prom Replacement .................................................................. JVC AV-29SX1EK 5

Remote transmitter ..................................................................... JVC AV-29SX1EK 5

Specifications

Dimensions (W X H X D) ......................................................... 66.3cm x 51.7cm X 47.2cm

Mass ............................................................................................................................ 29.8kg

TV RF System .......................................................................................................... CCIR (I)

Colour System ...................................................................PAL/NTSC (only in EXT mode)

Stereo System......................................................................................................NICAM 6.0

Teletext system........... FASTEXT (United Kingdom system) /WST (Standard System)

Receiving Channels and Freq................................ UHF: E21 - E69 . . 470MHz - 862MHz

Intermediate Frequency

VIF Carrier ............................................................................................................. : 39.5MHz

SIF Carrier ............................................................................................. : 33.5MHz (6.0MHz)

Colour Sub Carrier Frequency

PAL......................................................................................................................... : 4.43MHz

NTSC .................................................................................................... : 3.58MHz / 4.43MHz

Aerial Input Terminal.................................................................75Ω Unbalanced, Coaxial

Power Input ........................................................................................ 220 - 240V AC , 50Hz

Power Consumption ....................................................................97W(Avg.) / 158W(Max.)

Picture Tube................................................................................ 25” ( Visible size: 59cm),

................................................................................................. Diagonally measured + 1kV

High Voltage.................................................. 28.0kV +1kV/-1.5kV (at zero beam current)

Speaker................................................................................. (10cm+2cm) x2, Round Type

Audio Output........................................................................................................ 10W + low

EXT Input / Output..................... EXT-1/EXT-2 : 21-pin Euroconnector (SCART socket)

EXT-3 (Input) .................................................................. Video: 1Vpp 75 Ω (RCA pin jack)

................................. Audio(L/R) : 500mVrms (-4dBs) , High Impedance (RCA pin jack)

Audio Output..................................................... Variable (0~1,000Vrms) Low impedance

Centre .............................................................................................................. RCA pin jack

Front L,R....................................................................................................RCA pin jack X 2

Surround L,R.............................................................................................RCA pin jack X 2

Headphone Jack ..................................................................... Stereo mini jack (ø 3.5mm)

Remote Control Unit ............................................. RM-C770 [Battery size AAA (R03) X2]

Design & specification subject to change without notice

Adjustments

B1 VOLTAGE CHECK

Item Measuring Test point Adjustment part Description

Check of B1 Signal generator TP-91 1. Receive a whole black signal. Voltage (1st terminal 2. Connect a DC voltmeter to TP-91

FOCUS ADJUSTMENT

Item Measuring Test point Adjustment part Description

Adjustment Signal FOCUS VR 1. Receive a cross-hatch signal. of FOCUS generator [built-in HVT] 2.While watching the screen, adjust the

instrument

of X connector) and TP-E .

3. Make sure that the voltage is DC150 ± 2.0V.

DC Voltmeter TP-E

instrument

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.

Recommended Safety Parts

Item Part No. Description

1 A59ECF20X05 PICTURE TUBE(ITC) V01(Inc.DY.Wed&PC) 2 CELD019—002J7 DEG. COIL L01 5 AEEMP003-185 POWER CORD 7 CM12771-A01-E REAR COVER 9 CM22875-005-E RATING LABEL 11 CETH011-00AJ1 H.V.TRANSF. T1551 100 CM12770-C0A-E FRONT CABI ASSY Inc.No.101~108 R1585 QRV141F-2491AY MF R 2.49k Ω 1/4W R1586 QRV141F-1582AY MF R 15.8k Ω 1/4W R1991 QRZ0057-825 C R 8.2M Ω 1W

C1521 QFZ0117-3801L MPP CAP. 3800p F1.5kVH ± 2.5% C1522 QFZ0117-8001L MPP CAP. 8000p F1.5kVH ± 2.5% C1524 QFZ0119-514S MPP CAP. 0.51µF 200V ± 3% C1528 QFZ0119-474S MPP CAP. 0.47µF 200V ± 2.5% C1905 QCZ9034-472A C CAP. 4700p FAC400V C1906 QCZ9034-472A C CAP. 4700p FAC400V C1992 QCZ9041-471A C CAP. 470p FAC400V C1993 QCZ9041-332A C CAP. 3300p FAC400V

T1901 CETS044-001J4 SW TRANSF. L1551 CELC901-076J6 HEATER CHOKE D1901 D3SBA60 DIODE BRIDGE Q1521 BU2508AX POWER TRANSISTOR H. OUT IC1902 TLP621(D4)-LF2 PHOTO COUPLER CP1951 ICP-N38-Y I.C.PROTECT

FR1552 QRH02JK-R82M F R 0.82 Ω 2W FR1553 QRH127J-5R6M F R 5.6 Ω 1/2W FR1554 QRZ0054-4R7M F R 4.7 Ω 1/4W FR1557 QRH017J-1R0M F R 1 Ω 1W FR1962 QRH027J-2R7M F R 2.7 Ω 2W

SK3001 CE42535-001J1 CRT SOCKET C8901 QFZ9040-474N MF CAP. 0.47p FAC275V

C8904 QFZ9040-473N MF CAP. 0.047p FAC275V F8901 QMF51D2-3R15J1 FUSE T3.15AH LF8901 CE42144-001J2 LINE FILTER S8901 QSP4K21-C01 PUSH SWITCH MAIN POWER TH8901 CEKP011-001J2 TH POSISTOR R0403 QRZ0054-470M F R 47 Ω 1/4W R0504 QRZ0054-330M F R 33 Ω 1/4W R0509 QRZ0054-470M F R 47 Ω 1/4W 9 CQ40122-001-E SET UP GUIDE 10 CQ40121-001-E INST BOOK

IF CIRCUIT ADJUSTMENT

Item Measuring Test point Adjustment part Description

Adjustment Remote T010 TRANSF. Do not make any adjustment unless the of VCO

Adjustment Remote DELAY POINT 1. Receive a black and white signal (colour off). of DELAY control unit (AGC TAKE-OVER) 2. Select 1 IF from the SERVICE MENU. POINT (AGC) 3. Select 2.DELAY POINT by pressing the 2 key

instrument

control unit adjustment is out of way and you cannot get

VCO (CW) TOO HIGH of the characters TOO HIGH displayed ABOVE REFERENCE on the screen changes from blue to yellow. BELOW REFERENCE YELLOW (Step 1) TOO LOW 5. Then slowly turn the core of T010 TRANSF. to

■ = EXIT REFERENCE

Screen display Step

TOO HIGH Yellow ➔ Blue ➔ Blue ABOVE REFERENCE Blue ➔ Yellow ➔ Blue BELOW REFERENCE Blue ➔ Blue ➔ Yellow TOO LOW Blue ➔ Blue

MHz fv 4. Turn the core of T010TRANSF. until the colour

***.**

➔

1 ➔ 2 ➔ 3

correct PICTURE.

1. Select 1.IF from the SERVICE MENU.

2. Press 1 key and select 1 .VCO.

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

the left until the colour of the characters BELOW

changes from blue to yellow (Step 3)

6. Perform CHANNEL PRESET again, and make

sure that each broadcast is being received properly.

on the remote control.

4. Adjust the FUNCTION -1+ key until video noise

disappears.

5. Press the VIDEO/SOUND key and memorize

the setting value.

6. Turn to other channels and make sure that

there are not irregularities.

Setting (Adjustment) item Variable range Initial setting value

DELAY POINT 0 ~ 63 10 (AGC TAKE-OVER)

VSM PRESET SETTING

Item Measuring Test point Adjustment part Description

instrument

Setting of Remote 1. BRIGHT 1. Select 5.VSM PRESET from the SERVICE VSM control unit 2. CONT. MENU. PRESET 3. COLOUR 2. Select STANDARD with the CINEMA/GAME key.

4. SHARP 3. Adjust the FUNCTION UP/DOWN and FUNCTION

5. TINT -/+ key to bring the set values of 1. BRIGHT~ 10.

6. R DRIVE TREBLE to the values shown in the table.

7. G DRIVE 4. Press the VIDEO/SOUND key and memorize the

8. B DRIVE set value.

9. BASS 5. Respectively select the VSM PRESET mode for

10.TREBLE USER, CINEMA and GAME, and make similar adjustment as in 3 and 4 above.

SETTING VALUES OF VSM PRESET

Setting item VSM preset mode STANDARD USER CINEMA GAME

1. BRIGHT SETTING VALUE 0 0 0 +2

2. CONT. SETTING VALUE +10 +10 +2 +2

3. COLOUR SETTING VALUE 0 0 -2 0

4. SHARP SETTING VALUE +2 +2 -2 -2

5. TINT SETTING VALUE 0 0 0 0

6. R. DRIVE SETTING VALUE 0 0 0 0

7. G. DRIVE SETTING VALUE 0 0 -2 0

8. B. DRIVE SETTING VALUE 0 0 -6 0

9. BASS SETTING VALUE 0 0 +6 +4

10. TREBLE SETTING VALUE 0 0 +2 0

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.

Setting Variable Initial (adjustment) range setting item value

1. CUTOFF ON/OFF OFF

2. R DRIVE -31~ +32 +12

3. G DRIVE -31~ +32 +2

4. B DRIVE -31~ +32 0 (Do not adjust) (Fixed)

5. BRIGHT -31~ +32 +6

6. CONT. -41~ +22 -5

Setting Colour Variable PAL SECAM NTSC NTSC (adjustment) system range 3.58 4.43 item

7. COLOUR TV + 3 + 3 - initial setting -31~ +32 - - +12 (+12) value Comp. VIDEO

8. TINT initial setting Comp. VIDEO -31~ +32 - - -2 (-2) value

Item Measuring Test point Adjustment part Description

instrument

Adjustment Signal R. CUT OFF VR 1.Receive a black and white signal (colour off). of WHITE generator (R108) 2.Select 2.V/C from the SERVICE MENU. BALANCE 3.Select 1.CUT OFF with the FUNCTION UP/DOWN (Low light) key.

Remote G. CUT OFF VR 4.Show one horizontal line with the FUNCTION -1+ control unit (R107) key. With the SCREEN VR, adjust so that

the horizontal line will not be too bright.

B. CUT OFF VR 5.Turn the CUT OFF VR respectively for R, G and B (R109) fully to the left (to the left direction when seen from

the rear).

6.Gradually turn the SCREEN VR from the left end to

SCREEN VR 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. With the -/ + key, turn off 1 CUTOFF screen.

Specifications / Adjustments / Adjustments Cont’d / Safety Parts / CRT Diagram / Front Control Diagram / Main Diagram 1 / Main Diagram 2

2JVC AV-25SX1 EK

Adjustments Cont’d

Item Measuring Test point Adjustment part Description

Adjustment Signal 2. R. DRIVE 1. Receive a black and white signal (colour off). of WHITE generator 3. G. DRIVE 2. Select 2.V/C with the SERVICE MENU. BALANCE 3. Select 2.R DRIVE and 3.G DRIVE with the

(High light) Remote (Do not adjust) 4. Change the screen colour to white with the

Adjustment Remote 5. BRIGHT 1. Receive any broadcast. of control unit 2. Select 2.V/C from the SERVICE MENU. SUB BRIGHT 3. Select 5.BRIGHT with the FUNCTION UP/

Adjustment Remote 6. CONT. 1. Receive any broadcast. of control unit 2. Select 2.V/C with the SERVICE MENU. SUB CONT. 3. Select 6.CONT. with the FUNCTION UP/DOWN key. 4. Set the initial setting value with the FUNCTION

Adjustment Remote 7. COLOUR [Method of adjustment without using measuring of control unit instrument] SUB COLOUR I PAL COLOUR (PAL COLOUR)

Adjustment Signal TP-47B 7. COLOUR [Method of adjustment using measuring instrument] of generator TP-E SUB (CRT SOCKET PAL COLOUR (PAL COLOUR) COLOUR II Oscilloscope PWB) 1. Receive a PAL full field colour bar signal (75%

instrument

4. B. DRIVE FUNCTION UP/ DOWN key.

control unit FUNCTION -/+ key.

NTSG COLOUR (NTSC 3.58 COLOUR)

Remote DOWN key. control unit 4. Set the initial setting value of PAL COLOUR

NTSC COLOUR (NTSC 3.58 COLOUR)

5. Press the VIDEO/SOUND key, and memorize the respectively set values.

DOWN key.

4. Set the initial setting value with the FUNCTION

-/ + 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 VIDEO/SOUND key and memorize the set value.

-/ + 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 VIDEO/SOUND key and memorize the set value.

1. Receive a PAL broadcast.

2. Select 2.V/C trom 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 -/+ 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 VIDEO/SOUND key and memorize the set value.

7. Input NTSC3.58MHz COMPOSITE VIDEO signal from the EXT terminal.

8. Make similar fine adjustment of NTSC3.58 COLOUR as previously.

(NTSC 4.43 COLOUR)

When NTSC 3.58 is set, NTSC 4.43 will be

automatically set at the same value as NTSC 3.58.

white).

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

3. Select 7.COLOUR with the FUNCTION UP/

with the FUNCTION -/ + key.

5. Connect the oscilloscope to TP-478.

6. Adjust PAL COLOUR and bring the value of (A) in the illustration to (-10V. AV -25SX1EK) (-4V.AV 25& 28VM1EK).

7. Press the VIDEO/SOUND key and memorize the seting value.

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

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

Item Measuring Test point Adjustment part Description

instrument

3. Adjust NTSC 3.58 COLOUR and bring the value of (A) of the illustration to 0V.

4. Press the VIDEO/SOUND key and memorize the set value.

(NTSC 4.43 COLOUR)

When NTSC 3.58 is set, NTSC 4.43 will be automatically set at the same value as NTSC 3.58.

Adjustment Remote 8. TINT [Method of adjustment without using measuring of control unit instrument] SUB TINT I

NTSC TINT (NTSC 3.58 TINT)

1. Input COMPOSITE VIDEO signal of NTSC3.58MHz from the EXT terminal.

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

3. Select STINT with the FUNCTION UP/DOWN key.

4. Set the initial selling value of NTSC 3.58 TINT with the FUNCTION -/+ key.

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

6. Press the VIDEO/SOUND 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 same value as NTSC 3.58.

Adjustment Signal TP-47B 8. TINT [Method of adjustment using measuring of generator TP-E instrument] SUB TINT II

(CRT NTSC TINT (NTSC 3.58 TINT)

Oscilloscope SOCKET 1. Input COMPOSITE VIDEO signal (full field

PWB) colour bar 75% white) of NTSC3.58MHz from

the EXT terminal. Remote 2. Select 2.V/C from the SERVICE MENU. control unit 3. Select 8.TINT with the FUNCTION UP/DOWN

key.

4. Set the initial setting value of NTSC 3.58

TINT with the FUNCTION -/+ key.

5. Connect the oscilloscope to TP-47B.

6. Adjust NTSC3.58 TINT to bring the value of

(A) of the illustration to 0V.

7. Press the VIDEO/SOUND 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 same value as NTSC 3.58.

DEFLECTION CIRCUIT ADJUSTMENT

There are 2 modes of adjustment - (1) 50Hz 4 3 and (2) 60Hz 4: 3 - depending upon the kind of signals (VERTICAL FREQUENCY 50Hz/ 60Hz). When adjusted in the (1) 50Hz 4: 3 mode, the mode (2) will be linked to the mode (1) and will be automatically adjusted for the same value. When adjusted in the mode (2) only this mode will be adjusted singly.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.

Setting Adjustment name Variable AV-25SX1EK AV-25VM1EK AV-28VM1EK (adjustment) range Initial setting value Initial setting value Initial setting value item 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz

4:3 4:3 4:3 4:3 4:3 4:3

1. V-SLOPE Vertical hight -31~ + 32 + 5 0 -1 0 -1 0 (Size of bottom side of screen)

2. V-SHIFT Vertical center -31~ + 32 + 3 -1 +2 -1 +2 -1

3. V-SIZE Vertical hight -31~ + 32 + 7 -2 -10 -2 -10 -2

4. H-CENT Horizontal center -31~ + 32 + 4 +10 -5 +10 -5 +10

5. H-SIZE Horizontal width -31~ + 32 + 23 0 +20 0 +22 0

6. EW-PIN Side pin correction -31~ + 32 -7 0 -2 0 -2 0

7. TRAPEZ Trapezoidal distortion correction -31~ + 32 + 1 0 -5 0 -5 0

8. V-S.CR Vertical hight correction -31~ + 32 -3 0 +3 (Fixed) 0 (Fixed) +3 (Fixed) 0 (Fixed)

9. EW-COR Side pin four corner -31~ +32 -10 0 +1 (Fixed) 0 (Fixed) -5 (Fixed) 0 (Fixed) correction

Item Measuring Test point Adjustment part Description

instrument

1. Adjustment Signal 1. V-SLOPE [(1) 50Hz 4:3] of VERTICAL generator SLOPE 1.Receive a circle pattern signal of vertical

frequency 50Hz.

2.Select 4.DEF from the SERVICE MENU. Remote 3.Select 1 V-SLOPE with the FUNCTION UP/ control unit DOWN key.

4. Set the initial setting value of V-SLOPE

(50Hz 4:3) with the FUNCTION -1+ key.

5. Adjust V-SLOPE and make the screen’s

center line and the blanking line coincide.

2. Adjustment 2. V-SHIFT 6. Select 2.V-SHIFT and set the initial setting of value. VERTICAL SHIFT 7. Adjust V-SHIFT to make A = B.

8. Press the VIDEO / SOUND key and

memorize the set value.

3. 3. V-SIZE 9. Receive a cross-hatch signal. Adjustment 10. Adjust 3.V-SIZE and set the initial setting value. of 11. Adjust V-SIZE and make the vertical screen VERTICAL size 92% of the picture size. SIZE 12. Press the VIDEO / SOUND key and

memorize the set value.

4. 4. H-CENT 13. Receive a circle pattern signal. Adjustment 14. Select 4.H-CENT and set the initial setting of value. HORI. 15. Adjust H-CENT to make C=D CENTRE 16. Press the VIDEO/SOUND key and

memorize the set value.

5. 5. H-SIZE 17. Receive a cross-hatch signal. Adjustment 18. Select 5.H-SIZE and set the initial setting of HORI. value. SIZE 19. Adjust H-SIZE and make the horizontal

screen size 92% of the picture size.

6. 6. EW-PIN 20. Select SEW-PIN and set the initial setting Adjustment value. of EW-PIN 21.Adjust EW-PIN and make the 1st vertical

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

7. 7. TRAPEZ 22. Select 7.TRAPEZ and set the initial setting value. 23. Adjust TRAPEZ and bring the vertical lines Adjustment of TRAPEZ at the right and left edges of the screen in parallel.

8. 8. V-S. CR 24. Select 8.V-S. CR and set the initial setting Adjustment values. Of V-S. CR 25.Adjust V-S. CR and make the gaps between

the horizontal lines same.

9. 9. EW-COR 26. Select 9.EW-COR and set the initial setting Adjustment values. of EW-COR 27.Adjust EW-COR and make the vertical lines

at the four corners of the screen straight.

28. Press the VIDEO/SOUND key and

memorize the set values.

29. Make sure that the adjustement is properly

done on the screen of (2) 60Hz 4:3

AUDIO CIRCUIT Do not touch 3.AUDIO (1. CONC LIMIT, 2. A2 ID THR) of the SERVICE MENU as it requires no adjustment.

3. AUDIO

Setting (adjustment) item Variable AV-25SX1EK AV-25M1EK

range Initial setting AV-28M1EK

value (fixed) (fixed)

1. CONG LIMIT (Do not adjust) 00H ~ FFH 0AH 0AH

2. A2 ID THR (Do not adjust) 00H ~ FFH 19H 12H

Specifications / Adjustments / Adjustments Cont’d / Safety Parts / CRT Diagram / Front Control Diagram / Main Diagram 1 / Main Diagram 2

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