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JVC AV-28KH1BUF, Service Manual

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JVC AV-28KH1BUF Service Manual Download Page 13

(No.52139)1-13

4.6

ADJUSTMENT PROCEDURE

4.6.1 FOCUS / SCREEN ADJUSTMENT

4.6.2 AGC ADJUSTMENT

Item

Measuring 

instrument

Test point

Adjustment part

Description

FOCUS
adjustment

Signal 
generator

Remote 
control unit

FOCUS VR
[On the FBT]

(1) Receive a cross-hatch signal.
(2) Adjust FOCUS VR on the FBT as thin as possible. 

SCREEN
adjustment

Signal 
generator

Remote 
control unit

1pin (GND)
RGB cathodes
[CRT PWB]

SCREEN VR
[On the FBT]

(1) Receive a colour-bar signal.
(2) Ground pin of probe will be connected to 1pin (GND)

of the CRT socket.

(3) 1/100 oscilloscope probe to RGB cathodes on CRT

PWB.

(4) Adjust all control functions (brightness, colour and

contrast) to minimum settings.

(5) Adjust the SCREEN VR until acthode voltage

becomes 150V.

Item

Measuring 

instrument

Test point

Adjustment part

Description

AGC
adjustment

Signal 
generator

Remote 
control unit

Volt meter

AGC

(1) Receive a PAL BG signal at 60dBmV RF signal

level.

(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO

adjustment group.

(4) Select AGC.
(5) Adjust AGC by pressing till voltage at pin 1 of

TUNER is equal to 3.0V.

(6) Press the [INFORMATION] key and memorize the

set value.

FBT

FOCUS VR

SCREEN VR

FBT

FOCUS VR

SCREEN VR

Summary of Contents for AV-28KH1BUF

Page 1: ...VICTOR COMPANY OF JAPAN LIMITED No 52139 2003 9 COLOUR TELEVISION 52139 2003 9 AV 28KH1BUF AV 28KH1SUF TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 4 3 DISASSEMBLY 1 6 4 ADJUSTMENT 1 10 5 TROUBLESHOOTING 1 21 ...

Page 2: ...ency PAL 4 43MHz SECAM 4 43MHz NTSC 3 58MHz 4 43MHz Power Input AC220V AC240V 50Hz Power Consumption 151W Max 3W Standby Aerial Input Terminal 75Ω unbalanced coaxial Picture Tube Visible size 66cm Measured diagonally High Voltage 30kV Speaker Main 5 7cm 16cm oval type 2 Tweeter 8W 15W 2 Audio Output 10W 10W Input Video 1V p p 75Ω S Video Y 1V p p positive C 0 286V p p Audio L R 500mV rms 4dBs High...

Page 3: ...ments or alternatives approved by the manufacturer of the complete product 7 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 10kΩ 2W resistor to the anode button 8 When service is requ...

Page 4: ...ance Used L1 Used L2 7 B input 700mV B W 75 Ω Used Used 8 FUNCTION SW SLOW SW Low 0V 3V High 8V 12V High impedance Used Used 9 GND G Used Used 10 SCL T V LINK Not used Used SCL TV LINK 11 G input 700mV B W 75 Ω Used Used 12 SDA3 Not used Not used 13 GND R Used Used 14 GND YS Used Used 15 R C input R 700mV B W 75 Ω C 300mV P P 75 Ω Used R Used C2 R 16 Ys input FAST SW Low 0V 0 4V 75 Ω High 1V 3V 75...

Page 5: ...ne Direct channel access APS Automatic Programming System All programs can be named Forward or backward automatic tuning Sleep timer Child Lock Blue Background Comb Filter CTI T V Link Automatic sound mute when no transmission 5 minutes after the broadcasting close down the TV switches itself automatically to stand by mode WSS Wide Screen Signaling NTSC Playback 2 3 MAIN DIFFERENCE LIST Part Name ...

Page 6: ...d upside down or it may not fall 3 1 7 REMOVING THE POWER SWITCH PWB Remove the REAR COVER 1 Remove the 2 screws G and remove the POWER SWITCH PWB 3 1 8 REMOVING THE LED PWB Remove the REAR COVER Remove the POWER SWITCH PWB 1 Remove the 2 screws H and remove the LED PWB 3 1 9 REMOVING THE SPEAKER and TWEETER Remove the REAR COVER 1 Remove the 4 screws I and remove the SPEAKER 2 Remove the other ha...

Page 7: ... No 52139 1 7 Fig 1 x4 x2 x4 x4 x4 x2 x2 x2 x2 x8 LED PWB POWER SWITCH PWB TWEETER MAIN PWB BASE FEATURE BOX PWB REAR COVER BACK DOOR CRT SOCKET PWB SPEAKER SIDE CONTROL PWB B A C D E F H G I J ...

Page 8: ...he 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 alternately melt the solder at each lead Shift and remove the chip part NOTE After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern as in...

Page 9: ...N by pressing keys on the remote control unit 5 Store the change by pressing INFORMATION key 6 Press MENU key on the remote control unit to exit service mode Setting Item Setting Value Setting Item Setting Value SOUND MENU FEATURE MENU BALANCE CENTER SLEEP TIMER OFF BASS CENTER CHILD LOCK OFF TREBLE CENTER HYPER SOUND OFF PICTURE MENU INSTALL BRIGHTNESS These adjust are automatically restored when...

Page 10: ...e 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 condensers etc 7 Presetting before adjustment Unless otherwise specified in the adjustment instructions preset the following functions with the remote control unit 4 2 MEASURING EQUIPMENT 1 DC voltmeter or digital voltmeter 2 Signal g...

Page 11: ...MATION key to STORE 4 5 3 HOW TO EXIT SERVICE MODE 1 Press the MENU key PRODUCTION i STORE MENU EXIT H V FULL MODE V SHIFT V SIZE H SHIFT H SIZE S COR LINRT ANGLE BOW TRAPEZ PARAB U COR L COR TILT TRPZD NTSCHS TXTV HS04_3 JVC52 VIDEO WdR WdG WdB CuR CuG CuB YDP AGC APSW APS T_T T_P YDS YDN DVD C M 4 3 SERVICE SERVICE MENU PRODUCTION i STORE MENU EXIT ADJUSTMENTS PIP CNTRST PIP YDelay PIP Frame EHT...

Page 12: ... Colour Brightness Contrast Colour WdR WdG WdB WdR WdG WdB PANO1 PANO2 USER USER USER BRIGHT BRIGHT BRIGHT STANDARD STANDARD STANDARD SOFT SOFT SOFT WARM WARM WARM COOL COOL COOL FACTORY SETTINGS PICTURE MODE SET MENU MENU SERVICE PICTURE MODE SETTINGS V SHIFT V SIZE H SHIFT H SIZE S COR LINRT ANGLE BOW TRPEZ PARAB U COR L COR VBST VBSO HBST HBSO PANORAMA PICTURE MODE SETTINGS SERVICE MENU Colour ...

Page 13: ...ted to 1pin GND of the CRT socket 3 1 100 oscilloscope probe to RGB cathodes on CRT PWB 4 Adjust all control functions brightness colour and contrast to minimum settings 5 Adjust the SCREEN VR until acthode voltage becomes 150V Item Measuring instrument Test point Adjustment part Description AGC adjustment Signal generator Remote control unit Volt meter AGC 1 Receive a PAL BG signal at 60dBmV RF s...

Page 14: ...e INFORMATION key and memorize the set value VERTICAL SIZE adjustment Signal generator Remote control unit V SIZE 1 Receive a cross hatch signal 2 Enter the SERVICE MENU 3 Press the RED key then enter the H V adjustment group 4 Select V SIZE 5 Adjust V SIZE until horizontal black lines on both the upper and lower part of the cross hatch pattern become very closeted the upper and lower horizontal s...

Page 15: ...size of squares of the cross hatch pattern become in equal size from the top of the screen to its bottom of the whole screen 10 Check and readjust LINRT item if the adjustment becomes improper after some other geometric adjustments especially after than S COR adjustment are done 11 Press the INFORMATION key and memorize the set value HORIZONTAL SHIFT adjustment Signal generator Remote control unit...

Page 16: ...ment group 4 Select ANGLE 5 Adjust ANGLE till the vertical lines of the cross hatch pattern become straight 6 Check and readjust ANGLE item if the adjustment becomes improper after some other geometric adjustments are done 7 Press the INFORMATION key and memorize the set value BOW adjustment Signal generator Remote control unit BOW 1 Receive a cross hatch signal 2 Enter the SERVICE MENU 3 Press th...

Page 17: ... Press the INFORMATION key and memorize the set value SIDE PIN adjustment Signal generator Remote control unit PARAB 1 Receive a cross hatch signal 2 Enter the SERVICE MENU 3 Press the RED key then enter the H V adjustment group 4 Select PARAB 5 Adjust PARAB till vertical lines close to the both sides of the picture frame become parallel to vertical sides of picture tube without any bending to lef...

Page 18: ...rtical and parallel to vertical corner sides of picture tube 9 Check and readjust L COR item if the adjustment becomes improper after some other geometric adjustments are done 10 Press the INFORMATION key and memorize the set value ROTATION adjustment Signal generator Remote control unit TILT 1 Receive a cross hatch signal 2 Enter the SERVICE MENU 3 Press the RED key then enter the H V adjustment ...

Page 19: ...V 1 Receive a cross hatch signal 2 Enter the SERVICE MENU 3 Press the RED key then enter the H V adjustment group 4 Select TXTV 5 Adjust TXTV to adjust the proper vertical size of Teletext screen 6 Check and readjust TRAPEZ item if the adjustment becomes improper after some other geometric adjustments are done 7 Press the INFORMATION key and memorize the set value 4 3 TUBE adjustment Signal genera...

Page 20: ...ICE MENU 3 Press the GREEN key then enter the VIDEO adjustment group 4 Select YDP 5 Adjust YDP till the colour transients on the colour bar pattern becomes as sharper and possible as colours between transients do not mix with each other 6 Press the INFORMATION key and memorize the set value SECAM Y DELAY adjustment Signal generator Remote control unit YDS 1 Receive a SECAM colour bar signal 2 Ente...

Page 21: ... No 52139 1 21 SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING ...

Page 22: ... No 52139 AV MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12 3 chome Moriya cho kanagawa ku Yokohama kanagawa prefecture 221 8528 Japan VICTOR COMPANY OF JAPAN LIMITED WPC Printed in Japan ...

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