JVC I' Art AV-27F802 Service Manual Download Page 29

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AV-27F802

No. 51757

Item

Measuring

instrument

Test point

Adjustment part

Description

MTS SAP
VCO
adjustment

Signal
generator

Frequency
counter

No.9 5FH MON.

No.10 SAP VCO

1. Receive a RF signal (non modulated sound signal) from the an-

tenna terminal.

2. Connect between pin 3 of [S2] connector and GND (Pin 2 of [S2]

connector) through 1M

Resistor.

3. Select the No.9 5FH MON. of the SOUND MODE, and reset the

setting value from 0 to 1.

4. Connect the Frequency Counter to pin 5 of [S2] connector and GND

(Pin 2 of [S2] connector) .

5. Select the No.10 SAP VCO.
6. Set the initial setting value of the No.10 SAP VCO with the LEFT/

RIGHT key of the remote control unit.

7. Adjust the No.10 SAP VCO so that the frequency counter will dis-

play 78.67kHz±0.5kHz.

8. Select the No.9 5FH MON. of the SOUND MODE, and reset the

setting value from 1 to 0.

MTS FILTER
check

1. Select the No.6 FILTER of the SOUND MODE.
2. Verify that the No.6 FILTER is set at its initial setting value.

No.6 FILTER

[S2]
Connector
3 pin TP_952.5
2 pin GND
5 pin AUDIO_R

MTS
SEPARATION
adjustment

1. Input a stereo L signal (300Hz) from the TV audio multiplex signal

generator to the antenna terminal.

2. Connect an oscilloscope to pin 4 of [S2] connector, and display one

cycle portion of the 300Hz signal.

3. Change the connection of the oscilloscope to pin 5 of [S2] connec-

tor, and enlarge the voltage axis.

4. Select the No.7 LOW SEP. of the SOUND MODE.
5. Set the initial setting value of the No.7 LOW SEP. with the LEFT/

RIGHT key of the remote control unit.

6. Adjust the No.7 LOW SEP. so that the 300Hz signal level will be-

come minimum.

7. Change the signal to 3kHz, and connect an oscilloscope to pin 4 of

[S2] connector.

8. Adjust the No.8 HI SEP. so that the 3kHz signal level will become

minimum.

No.7 LOW SEP.

No.8 HI SEP.

TV audio
multiplex
signal
generator

Oscilloscope

[S2]
Connector
4 pin AUDIO_L
5 pin AUDIO_R
2 pin GND

L-Channel
signal waveform

R-Channel
crosstalk portion

Minimum

1 cycle

MTS INPUT
LEVEL
check

1. Select the No.2 IN LEVEL of the SOUND MODE.
2. Verify that the No.2 IN LEVEL is set at its initial setting value.

No.2 IN LEVEL

MTS STEREO
VCO
adjustment

Signal
generator

Frequency
counter

1. Receive a RF signal (nonmodulated sound signal) from the antenna

terminal.

2. Select the No.3 FH MONITOR of SOUND MODE, and change the

setting value from 0 to 1.

3. Connect the Frequency Counter to pin 5 of [S2] connector and GND

(Pin 2 of [S2] connector).

4. Select the No.4 STEREO VCO.
5. Set the initial setting value of the No.4 STEREO VCO with the LEFT/

RIGHT key of the remote control unit.

6. Adjust the No.4 STEREO VCO so that the frequency counter will

display 15.73kHz±0.1kHz.

7. Select the No.3 FH MONITOR of the SOUND MODE, and reset the

setting value from 1 to 0.

No.3 FH MONITOR

No.4 STEREO VCO

[S2]
Connector
5 pin AUDIO R
2 pin GND

ADJUSTMENT OF MTS CIRCUIT

Summary of Contents for I' Art AV-27F802

Page 1: ...ONS 3 a FEATURES 4 a FUNCTIONS 5 a SPECIFIC SERVICE INSTRUCTIONS 6 a SERVICE ADJUSTMENTS 11 STANDARD CIRCUIT DIAGRAM APPENDIX 2 1 a PARTS LIST 33 SERVICE MANUAL AV 27F802 AV 27F802 COLOR TELEVISION BASIC CHASSIS AC TV No 51757 Sep 2000 COPYRIGHT 2000 VICTOR COMPANY OF JAPAN LTD ...

Page 2: ...z 02 06 A 8 by 02 06 01 07 13 by 07 13 A 1 by 14 22 J W by 23 36 54MHz 804MHz W 1 W 28 by 37 64 W 29 W 84 by 65 125 A8 A4 A1 by 01 96 99 180 Channels 45 75MHz 41 25MHz 4 5MHz 3 58MHz 120V AC 60Hz 140W 2 0A 27 68cm Measured Diagonally 30kV 1kV at zero beam current 2 4 3 4 5 12cm Oval type 2 5W 2 Video 1 3 4 1Vp p 75Ø RCA pin jack Audio 1 2 3 4 500mVrms 4dBs High Impedance RCA pin jack S Video Input...

Page 3: ...ufacturer of the complete product 8 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 10kØ 2W resistor to the anode button 9 When service is required observe the original lead dress Extr...

Page 4: ...701 MAIN MICON IF2 SCL 1 SDA 1 SCL 0 SDA 0 AFC 2 AFC 1 Remote control unit IC301 PIP CONTROL IC001 MTS TONE SURROUND CONTROL 3 D Y C TU001 TUNER 1 TU001 TUNER 2 IC101 1 CHIP CONTROL IC501 AVSW CONTROL 3 LINE Digital Y C Separation circuit improved picture quality Component input terminal for talking best advantage of Component Video Signal Audio Video input terminal S input 2 V input 2 Variable Fi...

Page 5: ...AV 27F802 No 51757 5 FUNCTIONS a REAR PANEL a FRONT PANEL a REMOTE CONTROL UNIT RM C301G 1A a FRONT PANEL DOOR OPENED ...

Page 6: ...re connector s etc REMOVING THE LF PW BOARD After removing the rear cover and chassis 1 Lift the left side of the LF PWB while pressing the 2 PWB stoppers marked G in the arrow direction marked H as shown in Fig 1 2 Then remove the LF PWB If necessary take off the wire connector s etc SPECIFIC SERVICE INSTRUCTIONS REMOVING THE DAF PW BOARD After removing the rear cover and chassis 1 Lift the right...

Page 7: ...2 No 51757 7 Fig 1 D F M A DAF PWB PWB STOPPER PWB STOPPER PWB STOPPER CLAW SPEAKER CHASSIS MAIN PWB LF PWB POWER SW PWB REAR COVER FRONT PWB CRT SOCKET PWB FRONT CABINET x12 x6 x6 E L H C K CLAW CLAW B B G G J ...

Page 8: ...creen 4 Refer to the SYSTEM CONSTANT table and check the setting items Where these differ select the setting item with the MENU UP DOWN key and adjust the setting with the MENU LEFT RIGHT keys The letters of the selected item are displayed in yellow 5 After adjusting release the MENU LEFT RIGHT key to store the setting value 6 Press the EXIT key twice to return the normal screen 5 Receive channel ...

Page 9: ...ER PICTURE CENTER BRIGHT CENTER DETAIL CENTER NOISE MUTING ON SET VIDEO STATUS ALL CENTER SOUND ADJUST BASS CENTER TREBLE CENTER BALANCE CENTER MTS STEREO CLOCK TIMERS SET CLOCK Unnecessary to set ON OFF TIMER NO INITIAL SETUP TV SPEAKER ON AUDIO OUT FIX V4 COMPONENT IN NO LANGUAGE ENG CLOSED CAPTION OFF AUTO TUNER SETUP TUNER MODE AIR CHANNEL SUMMARY Unnecessary to set V CHIP OFF SET LOCK CODE Un...

Page 10: ... Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alter nately melt the solder at each lead Shift and remove the chip part Note After removing the part remove remaining solder from the pattern REPLACEMENT OF CHIP COMPONENT 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern as indicat...

Page 11: ... Unless otherwise specified in the adjustment instructions preset the following functions with the remote control unit VIDEO STATUS STANDARD HYPER SURROUND OFF BASS TREBLE BALANCE CENTER TINT COLOR PICTURE CENTER BRIGHT DETAIL MEASURING INSTRUMENT 1 DC voltmeter or digital voltmeter 2 Oscilloscope 3 Signal generator Pattern generator NTSC 4 Remote control unit 5 TV audio multiplex signal generator...

Page 12: ...ET PWB SOLDER SIDE PIP PWB AV SW PWB MAIN PWB POWER SW PWB FRONT PWB CN006 B P B CN007 DAF CP TP E1 TP G S702 S704 S705 S703 S706 IC101 D101 S701 E3 F901 125V 5A CN005 CN002 CN001 PW CN005 CN004 CN004 S1 DAF UPPER H MIDDLE FOCUS LOWER SCREEN S1 C Q E1 HV CP E2 E1 K P CN003 CN002 CN001 J501 SS CN006 CN007 IC702 IC701 CPU DEG TU001 TU001 J601 R027 J602 K Q R507 Q511 Heatsink J502 J504 J503 CN003 TU0...

Page 13: ...and VIDEO STATUS key on the remote control unit simultaneously to enter the SERVICE MENU screen 1 shown in the next figure page 2 SERVICE MENU screen selection Press the UP DOWN key of the MENU to select any of the following items The letters of the selected items are displayed in yellow PICTURE SOUND THEATER OTHERS PIP 3 D Y C LOW LIGHT HIGH LIGHT RF AFC1 RF AFC2 VCO CW I2C BUS CTRL 3 Enter the a...

Page 14: ... RF AFC1 MODE DO NOT ADJUST RF AFC2 MODE DO NOT ADJUST I2C BUS CTRL MODE FIXED ON EXIT BY TOO HIGH GOOD TOO LOW RF AFC2 ON FINE 999 HIGH LEVEL REFERENCE LEVEL LOW LEVEL SYNC YES SELECT BY OPERATE BY EX IT EXIT BY I2C BUS ON SELECT BY OPERATE BY EX IT EXIT BY THEATER MODE 1 2 THEATER MODE 2 2 TINT 999 B CUT 999 COLOR 999 R DRIVE 999 PICTURE 999 B DRIVE 999 BRIGHT 999 DC REST 999 DETAIL 999 BLK ST 9...

Page 15: ...NG VALUE will be stored memorized 3 EXIT key Returns to the previous screen 5 Releasing SERVICE MENU 1 After returning to the SERVICE MENU upon completion of the setting ad justment work press the EXIT key again The settings for LOW LIGHT and HIGH LIGHT are described in the WHITE BAL ANCE page of ADJUSTMENT 1 BRIGHT STATUS 999 99999999 SETTING ITEM INITIAL SETTING VALUE Adjust SETTING VALUE PICTUR...

Page 16: ...alues When the four items No 6 7 8 and 9 are adjusted in the video mode the setting values in each item are revised independently No Setting Adjustment item Variable range Initial setting value 1 BRIGHT 000 127 063 2 PICTURE 000 127 060 3 COLOR 000 127 072 4 TINT 000 127 059 5 TV DETAIL 000 063 050 6 EXT BRIGHT 025 001 7 EXT PICT 025 000 8 EXT COLOR 025 000 9 EXT TINT 025 007 10 EXT DETAIL 000 063...

Page 17: ...03 003 53 SVM GAIN 000 003 002 54 CMP SVM GA 000 003 002 55 SVM PHASE 000 001 000 56 AUDIO SW 000 001 000 57 BUZZ 000 001 000 58 IF FREQ 000 001 000 59 RF AGC 000 063 045 60 AFT MUTE 000 001 000 61 AFT SENS 000 001 000 62 R G DRV SW 000 001 001 63 BLK SW 000 001 000 64 V S COR 000 015 012 65 V LIN 000 015 010 66 V SIZE 000 127 063 67 V AGC 000 001 000 68 V CENTER 000 063 035 69 TV AFC 000 003 002 ...

Page 18: ...0 255 000 98 RF SN YC F 000 255 000 99 RF SN YC G 000 063 000 100 RF SN YC H 000 255 000 101 EX SN YC E 000 255 000 102 EX SN YC F 000 255 000 103 EX SN YC G 000 063 000 104 EX SN YC H 000 255 000 105 RF SN VC 1 000 063 000 106 RF SN VC 2 000 063 000 107 RF SN VC 3 000 063 000 108 RF SN VC 4 000 063 000 109 EX SN VC 1 000 063 000 110 EX SN VC 2 000 063 000 111 EX SN VC 3 000 063 000 112 EX SN VC 4...

Page 19: ...VCO 000 063 003 11 IN GAIN 000 001 000 12 FIL OFFSET 010 000 13 BBE BASS 010 001 14 BBE TRE 010 001 SOUND MODE Setting Adjustment item Variable range Initial setting value TINT 20 06 COLOR 20 00 PICTURE 50 15 BRIGHT 20 00 DETAIL 20 00 R CUT 20 00 G CUT 20 00 B CUT 20 00 R DRIVE 99 09 B DRIVE 99 15 DC REST 00 03 01 BLK ST 00 03 00 GMM PNT 00 03 01 CD MATRIX 00 03 01 RY GAIN 00 01 01 GY PHASE 00 01 ...

Page 20: ...00 015 003 6 P G CUT 000 015 000 7 P B CUT 000 015 002 8 P R DR 000 255 052 9 P G DR 000 255 055 10 P B DR 000 255 060 11 LEFT POS 000 255 019 12 RIGHT POS 000 255 020 13 UPPER POS 000 127 012 14 LOWER POS 000 127 011 15 PICT LOCK 000 001 001 16 SELDEL 000 015 000 17 AGCFIX 000 001 001 18 AGCADST 000 001 000 19 AGC 000 015 007 20 VSPDEL 000 031 000 21 VSPISQ 000 001 001 22 YCOR 000 001 001 23 XFRE...

Page 21: ...0 001 000 19 YC 019 000 003 002 20 YC 020 000 001 000 21 YC 021 000 001 000 22 YC 022 000 003 002 23 YC 023 000 001 000 24 YC 024 000 001 000 25 YC 025 000 001 000 26 YC 026 000 003 000 27 YC 027 000 003 001 28 YC 028 N A 000 003 001 29 YC 029 000 003 001 30 YC 030 000 003 001 31 YC 031 000 003 002 32 YC 032 000 001 000 33 YC 033 000 007 000 34 YC 034 000 015 000 35 YC 035 000 007 002 36 YC 036 00...

Page 22: ...6 YC 066 N A 000 015 004 67 YC 067 000 001 000 68 YC 068 000 001 000 69 YC 069 000 001 000 70 YC 070 FIX 000 003 000 71 YC 071 000 001 000 72 YC 072 000 001 000 73 YC 073 000 001 001 74 YC 074 FIX 000 001 000 75 YC 075 FIX 000 001 000 76 YC 076 000 001 001 77 YC 077 FIX 000 001 000 78 YC 078 FIX 000 001 000 79 YC 079 FIX 000 007 005 80 YC 080 FIX 000 015 000 81 YC 081 FIX 000 015 008 82 YC 082 FIX...

Page 23: ... 007 002 108 3 D Y C 000 001 001 Setting Adjustment item Variable range Initial setting value R CUTOFF 0 255 85 G CUTOFF 0 255 85 B CUTOFF 0 255 85 LOW LIGHT MODE Setting Adjustment item Variable range Initial setting value R DRIVE 0 127 60 B DRIVE 0 127 60 HIGH LIGHT MODE Setting Adjustment item Variable range Initial setting value RF AFC1 ON OFF ON FINE 77 77 RF AFC1 MODE DO NOT ADJUST Setting A...

Page 24: ...noise disappears from the screen 6 Change to other channels and make sure that there Is no irregular ity 7 Press the MUTE key and get color out No 59 RF AGC Item Measuring instrument Test point Adjustment part Description ADJUSTMENT OF RF AGC FOCUS adjustment Signal generator 1 Receive a crosshatch signal 2 While looking at the screen center adjust the FOCUS VR so that the horizontal lines will be...

Page 25: ...SIZE of the PICTURE MODE 3 Set the initial setting value of the No 73 H SIZE with the LEFT RIGHT key of the remote control unit 4 Adjust the No 73 H SIZE until the horizontal screen size is 90 5 Adjust the No 72 H POSI until the screen will be horizontally centered No 73 H SIZE No 72 H POSI V SIZE and V LINEARITY Adjustment Signal generator 1 Receive a crosshatch signal 2 Select the No 66 V SIZE o...

Page 26: ...PIN of the PICTURE MODE 3 Adjust the end of vertical 2nd lines from left and right to be straight at the No 82 TOP PIN and the No 84 BTM PIN of the PICTURE MODE PIP DISPLAY POSITION Adjustment 1 Receive a broadcast 2 Select the PIP MODE from the SERVICE MENU 3 Then adjust the PIP screen size so that it occupies 80 2 of the main screen area No 11 LEFT POS No 12 RIGHT POS No 13 UPPER POS No 14 LOWER...

Page 27: ... SERVICE MENU 3 Set the initial setting value of R DRIVE and B DRIVE is 060 with the 4 6 7 and 9 keys of the remote control unit 4 Adjust the screen until it becomes white using the 4 6 7 and 9 keys of the remote control unit 9 The 3 EXIT key is the cancel key for the WHITE BALANCE Item Measuring instrument Test point Adjustment part WHITE BALANCE Low Light Adjustment Signal generator BRIGHT R CUT...

Page 28: ...ote control unit 4 Connect the oscilloscope between TP B and TP E1 5 Adjust COLOR and bring the value of A in the illustration to the voltage 5V VW B SUB TINT adjustment Method of adjustment without measuring instrument 1 Receive a broadcast 2 Select the No 4 TINT of the PICTURE MODE 3 Set the initial setting value of the No 4 TINT with the LEFT RIGHT key of the remote control unit 4 If the tint i...

Page 29: ... of S2 connec tor and enlarge the voltage axis 4 Select the No 7 LOW SEP of the SOUND MODE 5 Set the initial setting value of the No 7 LOW SEP with the LEFT RIGHT key of the remote control unit 6 Adjust the No 7 LOW SEP so that the 300Hz signal level will be come minimum 7 Change the signal to 3kHz and connect an oscilloscope to pin 4 of S2 connector 8 Adjust the No 8 HI SEP so that the 3kHz signa...

Page 30: ...e POWER SW ON 2 As shown in Fig 1 set the resistor between S1 connector 2 3 3 Make sure that the screen picture disappears 4 Temporarily unplug the power cord 5 Remove the resistor between S1 connector 2 3 6 Again plug the power cord make sure that the normal picture is displayed on the screen Fig 1 2 3 S1 CONNECTOR HEATER RESISTOR 20 66 kΩ 103 Ω 1 4 W POWER ON OFF RY951 R952 D535 R532 R951 Q951 Q...

Page 31: ...plied In the event a malfunction is detected the power is cut off immedi ately At this time the ON TIMER LED flashes to inform of the malfunc tion ON TIMER LED indication The ON TIMER LED flashes at 0 5 seconds intervals POWER Supplied After about 5 seconds Start of detection Malfunction is detected POWER OFF Flashing ON TIMER LED Over current protector Operation of B1 protector circuit The microc...

Page 32: ...AV 27F802 32 No 51757 ...

Page 33: ...4 630 851 7855 West Coast 5665 Corporate Avenue Cypress California 90630 714 229 8011 Southwest 10700 Hammerly Suite 105 Houston Texas 77043 713 935 9331 Hawaii 2969 Mapunapuna Place Honolulu Hawaii 96819 808 833 5828 Southeast 1500 Lakes Parkway Lawrenceville Georgia 30243 770 339 2582 JVC CANADA INC Head office 21 Finchdene Square Scarborough Ontario M1X 1A7 416 293 1311 Vancouver 13040 Worster ...

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