JVC AV24WT2, AV24WT2EK, AV24WT2EKN, AV24WT2EKS, AV24WT2EN Service manual & schematics

...

Download

Page 1

JVC AV 28WR2 EK/EN

General Information

Also Covers

AV 28WT EK, AV 28WT EN.

JF Chassis

Matrix

Item See Model Book

System Constant Set [AV 28WR2 EN]

Setting Values of System Constant Set [AV 28WR2 EN/EK]

Recommended Safety Parts

Item Part No. Description

[AV-28WT2 EN]

L01 CELD062-001J2 DEGAUSSING COIL V01 W66ESF002X14 ITC TUBE(C) (Inc.DY,PC,WED) T2551 CETH019-00AJ1 H.V .TRANSF . (SERVICE) 10 AEEMP001-185 POWER CORD 11 CM46618-A01-E POWER CORD CLAMP 12 CM12582-A04-E REAR COVER 14 CM23157-007-E RATING LABEL For ENG/GER/ITA 15 CM23049-009-E RATING LABEL For ENG/ESP/FRA

Other Adjustments............................................................................AV 32WR2EK 6

AV Terminal Diagram........................................................................AV 32WR2EK 6

Dolby Diagram ..................................................................................AV 32WR2EK 6

Front PCB Diagram [AV-28WR2EK/EN] ..........................................AV 32WR2EK 6

IF Diagram ........................................................................................ AV 32WR2EK 6

Power Deflection [AV-28WR2EK/EN] .............................................. AV 32WR2EK 6

Adjustments

Main Difference List between AV-28WR2 EN and AV-28WR2 EK

Main Difference List between AV-28WT2 EN and AV-28WT2 EK

System Constant Set [AV 28WT2 EN]

Setting Values of System Constant Set [AV 28WT2 EN/EK]

Adjustment Locations [AV 28WR2 EN/EK]

[AV-28WT2 EK]

L01 CELD061-001J2 DEGAUSSING COIL V01 W66ESF002X14 ITC TUBE(C) (Inc.DY,PC,WED) T2551 CETH019-00AJ1 H.V .TRANSF . (SERVICE) 10 AEEMP003-185A POWER CORD 11 CM46618-A01-E POWER CORD CLAMP 12 CM12582-A04-E REAR COVER 14 CM23047-006-E RATING LABEL

[AV-28WR2 EN]

L01 CELD061-001J2 DEGAUSSING COIL V01 W66ESF002X14 ITC TUBE(C) (Inc.DY,PC,WED) T2551 CETH019-00AJ1 H.V .TRANSF . (SERVICE) 10 AEEMP001-185 POWER CORD 11 CM46618-A01-E POWER CORD CLAMP 12 CM12582-A04-KD REAR COVER 14 CM23157-006-E RATING LABEL For ENG/GER/ITA 15 CM23049-006-E RATING LABEL For ENG/ESP/FRA

[AV-28WR2 EK]

[AV-28WT2 EN] [AV-28WR2 EN/EK]

R1252 QRZ0054-470M F R 47 OHM 1/4W J R2466 QRD14CJ-2R2SX C R 2.2 OHM 1/4W J R2991 QRZ0057-825 C R 8.2M OHM 1W J C2521 QF70122-242S MPP CAP. 2400pF 1.8kVH ±3% C2522 QFZ0117-1202S MPP CAP. 0.012uF 1.4kVH±2.5% C2531 QFZ0119-224S MPP CAP. 0.22uF 200V ±3% C2902 QCZ9034-472A C CAP. 4700p FAC400V P C2903 QCZ9034-472A C CAP. 4700p FAC400V P C2904 QCZ9034-472A C CAP. 4700p FAC400V P C2934 QFZ9040-473N MF CAP. 0.047uFAC275V M C2934 QFZ9040-473N MM CAP. 0.047uFAC275V M C2992 QCZ9041-471A C CAP. 470p FAC400V K C2993 QCZ9041-332A C CAP. 3300p FAC400V K T2901 CETS087-001J4 SW TRANSF . D2901 D3SBA60 DIODE BRIDGE Q2521 BU2508AX POWER TRANSISTOR H.OUT IC2902 TLP721F (D4-GR) I.C. (PH. COUPLER) CP2952 ICP-N50-Y I.C. PROTECT CP2953 ICP-N50-Y I.C. PROTECT FR2551 QRZ0054-4R7M F R 4. 7 OHM 1/4W J FR2552 QRH017J-1R0M F R 1 OHM 1W J FR2553 QRH017J-1R0M F R 1 OHM 1W J FR2953 QRH017K-R82M F R 0.82 OHM1W K RY2901 CESK028-002 RELAY TH2901 CEKP002-003 W. P. THERMISTOR R3306 QRD141J-100SY C R 10 OHM 1/4W J FR3319 QRH017J-561M F R 560 OHM 1W J SK3001 CE42535-001J1 C.R.T.SOCKET R8905 QRZ0111-474 C R 470k OHM 1/2W K C8901 QFZ9040-474N MF CAP. 0.47uFAC275V M F8901 QMF51D2-3R15J1 FUSE 3.15 A LF8901 CE42144-001J2 LINE FILTER LF8901 CELF012-001J7 LINE FILTER S8901 QSP4K21-C01 PUSH SWITCH MAIN POWER

[AV-28WT2 EN]

9 CQ40348-001-E INST BOOK For ENG/GER/FRA/NED/ITA 10 CQ40349-001-E INST BOOK For FIN/NOR/DEN/SWE/POR

[AV-28WT2 EK]

11 CQ40350-001-E INST BOOK

Page 2

JVC AV 28WR2 EK/EN

Adjustments Cont’d

Adjustment Locations [AV 28WT2 EN/EK]

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.

1. Receive a SECAM broadcast.

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

3. Select 7. BLACK OFFSET with the FUNCTION UP/DOWN key.

4. Set the initial setting value for BLACK OFFSET (R-Y) and (B-Y) with 4 and 7 or 6 and 9 keys of the remote control.

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

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

Adjustment of BLACK OFFSET (SECAM) II Measuring Instrument

Signal generator Oscilloscope Remote control unit

Test Point

35 PIN (R-Y) 38 PIN (B-Y) IC-101 OF MAIN PWB

Ajustment Part

7. BLACK OFFSET

(R-Y)*** (B-Y)***

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

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

3. Select 7. BLACK OFFSET with the FUNCTION UP/DOWN key.

4. Connect the oscilloscope between 35 pin of IC-101 and TP-E (***)

5. By using 4 and 7 keys of the remote control, adjust the BLACK OFFSET (R-Y) so that it becomes the waveform changes from (a) to (b) shown in the figure.

6. Connect the oscilloscope between 36 pin of IC-101 and TP-E.

7. By using 6 and 9 keys of the remote control, adjust the BLACK OFFSET (B-Y) so that it becomes the waveform changes from (c) to (d) shown in the figure.

[AV-28WR2EN/EK]

8. If the picture is not the best when adjusted, make fine adjustment until you get the best picture.

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

DEFLECTION CIRCUIT ADJUSTMENT

There are 6 modes of the adjustment

(1) 50Hz mode

(1) PANORAMIC (2) FULL (3) REGULAR (4)14:9 ZOOM (5)16:9 ZOOM (6)16:ZOOM SUB TITLE)

(2) 60Hz mode

(each aspect mode) depending upon the kind of signals (vertical frequency 50Hz / 60Hz). When the 50Hz PANORAMIC mode has been established, the setting of other modes will be done automatically. However, if the picture quality has not been optimized, adjust each mode again, respectively. The 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.

SECAM COLOUR [Method of adjustment without measuring instrument]

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

2. Set the initial setting value of SECAM COLOUR with the FUNCTION

3. Adjust SECAM COLOUR and bring the value of (A) of the illustration to +5V.

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

-/+

key.

NTSC COLOUR ADJUSTMENTS (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) [AV-28WR2 EK] or 0V(W~B) [AV-28WT2 EK].

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

TINT ADJUSTMENTS [NTSC 3.58 TINT]

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

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

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

4. Set the initial setting value of NTSC 3.58 TINT with the FUNCTION - or + key.

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

6. Adjust NTSC 3.58 TINT to bring the value of (A) in the illustration to +3V [AV-28WR2 EK] or +5V [AV-28WT2 EK] (voltage difference between white (W) and magenta (Mg)).

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

Adjustment of BLACK OFFSET (SECAM) I Measuring Instrument

Remote control unit

Adjustment Part

7. BLACK OFFSET

(R-Y)*** (B-Y)***

Page 3