JVC AV-14AM Service Manual Download Page 4 | Manualshive

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No. 56091

AV-14AM

4

FEATURES

"

New chassis design enables use of an interactive on-screen control.

"

Wide range voltage (110V

～

240V) AC power input.

"

With AUDIO / VIDEO INPUT & OUTPUT terminal.

"

MUTING button can reduce the audio level to zero instantly.

"

Functional remote control to operate TV set (for channel select, volume control, power ON/OFF, etc.) from a distance.

"

I

2

C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & TURBO TIMER.

"

By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged automatically.

"

Built – in ON TIMER, & CHILD LOCK.

SYSTEM BLOCK DIAGRAM

IC301

VIDEO/CHROMA

DECORDER

IC702

MEMORY

TU001

TUNER

IC701

MICRO

COMPUTER

SCL1/SDA1

SCL2/SDA2

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Summary of Contents for AV-14AM

Page 1: ...PANY OF JAPAN LTD AV 14AM CONTENTS SPECIFICATIONS 2 SAFETY PRECAUTIONS 3 FEATURES 4 FUNCTIONS 5 SPECIFIC SERVICE INSTRUCTIONS 6 SERVICE ADJUSTMENTS 12 STANDARD CIRCUIT DIAGRAM APPENDIX 2 1 PARTS LIST 31 BASIC CHASSIS CG SERVICE MANUAL COLOUR TELEVISION ...

Page 2: ...z Intermediate Frequency SIF Carrier 32 5MHz 5 5MHz 33 5MHz 4 5MHz 31 5MHz 6 5MHz 32 0MHz 6 0MHz Colour Sub Carrier Frequency PAL 4 43MHz SECAM 4 40625MHz 4 25MHz NTSC 3 58MHz 4 43MHz Power Input AC110 240V 50 60Hz Power Consumption 70W Max 47W Avg Speaker 8cm Round type 1 Audio Output 3W monaural Aerial Input Terminal 75Ω Unbalanced Input Video 1V p p 75Ω RCA 2 Front Rear Front Rear Bridged conne...

Page 3: ...r 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 10k 2W resistor to the anode button 8 When service is required obs...

Page 4: ...ontrol to operate TV set for channel select volume control power ON OFF etc from a distance I2 C bus control utilizes single chip ICs for IF V C DEF VSM PRESET PRESET TURBO TIMER By means of AUTO PROGRAM the TV stations can be selected automatically and the TV channels can also be rearranged automatically Built in ON TIMER RETURN CHILD LOCK SYSTEM BLOCK DIAGRAM IC301 VIDEO CHROMA DECORDER IC702 ME...

Page 5: ...No 56091 AV 14AM 5 FUNCTIONS VIDEO INPUT VIDEO OUTPUT AUDIO INPUT AUDIO OUT PUT AERIAL INPUT FRONT PANEL REMOTE CONTROL UNIT REAR PANEL ...

Page 6: ...olding up the SPEAKER HOLDER slightly and unlocking the claw marked D D D D Then SPEAKER HOLDER can be removed 2 Then you can remove the SPEAKER CHECKING THE MAIN PW BOARD 1 To check the PW Board from back side 1 Pull out the MAIN PW Board Refer to REMOVING THE MAIN PW Board 2 Erect the PW Board vertically so that you can easily check the back side of the PW Board CAUTION When erecting the PW Boar...

Page 7: ...No 56091 AV 14AM 7 SPEAKER MAIN PWB CRT SOCKET PWB REAR COVER B A D FRONT CABINET POWER CORD C CRT SPEAKER HOLDER PWB STOPPER ...

Page 8: ...ONSTANT SET of Table 1 If the value is different select the setting item with the MENU key and set the correct value with the MENU key 5 Press the DISPLAY key twice and return to the normal screen 5 Receive channel of setting Refer to the OPERATING INSTRUCTIONS and set the receive channels channels preset as described 6 User Setting Check the user setting value of Table 2 and if setting value is d...

Page 9: ...U MAIN POWER OFF ON TIMER PR1 0 00 SUB POWER ON VNR OFF CHANNEL POSITION 1 POSITION AUTO SHUTOFF OFF VOLUME Appropriate sound volume CHILD LOCK OFF TV VIDEO INPUT TV BLUE BACK OFF ON SCREEN DISPLAY POSITION NUMBER DISPLAY CHANNEL PRESET Refer to OPERATING INSTRUCTION COLOUR SYSTEM AUTO PAL LANGUAGE ENGLISH SOUND SYSTEM B G TINT Refer to VSM PRESET OFF TIMER OFF COLOUR Refer to VSM PRESET PICTURE M...

Page 10: ... EXP START 7 C BPF 8 CW SCP 9 VIF DET LEVEL 10 SIF DET LEVEL 11 IF AGC MIN 12 VIF AGC 13 VIF PMOD 14 SIF BPF BW ADJUST 15 SIF TRAP FO ADJUST 16 SIF TRAP FO ADJUST 2 17 SIF TRAP 18 SIF BPF 19 VNR 20 RGB LIM 21 RGB LIMIT LEVEL 22 SIF SW 23 TEXT H POSITION 24 READ DATA 4 VSM PRESET BRIGHT STD SOFT TINT COLOUR BRIGHT CONT SHARP 6 TURBO TIMER ON or OFF Should be OFF If it is ON the timer in TIMER mode ...

Page 11: ...the data in the micro computer in accordance with the following procedures before starting adjustment REPLACING PROCEDURES 1 Turn the POWER OFF 2 Replace the IC301 with a new one 3 While pressing MENU button and VOL button ON the FRONT CABINET simultaneously turn the POWER ON When the POWER is turned ON the data is written in the micro computer immediately FRONT CABINET ...

Page 12: ...voltmeter or digital voltmeter 2 Oscilloscope 3 Signal generator Pattern generator PAL SECAM NTSC 4 Remote control unit ADJUSTMENT ITEMS Adjustment item Adjustment item B1 POWER SUPPLY DEFLECTION circuit adjustment FOCUS adjustment VSM PRESET adjustment IF circuit adjustment PRESET adjustment VIDEO CHROMA circuit adjustment PURITY CONVERGENCE Adjustment BASIC OPERATION OF SERVICE MENU 1 TOOL OF SE...

Page 13: ...ce you will return to the SERVICE MENU 2 DELAY POINT 1 Key Select 1 IF 2 Key Select 2 DELAY POINT MENU Key Set adjust the setting values of the setting items DISPLAY Key When this is pressed twice you will return to the SERVICE MENU 2 2 V C 3 DEF 4 VSM PRESET and 5 PRESET 2 5 Keys Select one from 2 V C 3 DEF 4 VSM PRESET and 5 PRESET MENU key Select setting items MENU Key Set adjust the setting va...

Page 14: ...ER OPERATE DISP EXIT 6 TURBO TIMER OFF ON OFF By pressing 6 key BRIGHT TINT COLOUR BRIGHT CONT SHARP OPERATE DISP EXIT SUB MENU 4 VSM PRESET SELECT DEF OPERATE DISP EXIT SUB MENU 3 DEF SELECT 50Hz 1 VER POSITION PAL V C PAL 1 CUTOFF OPERATE DISP EXIT R G B 50Hz SUB MENU 2 V C SELECT PRESET 1 C TRAP FIX OPERATE DISP EXIT 50Hz SUB MENU 5 PRESET SELECT B G PAL SERVICE MENU 1 IF 2 V C 3 DEF 4 VSM PRES...

Page 15: ...in TP 91 B1 2Pin NC 3Pin X ray2 4Pin X ray1 5Pin TP E HVT S1 HV U IC301 MEMORY IC IC702 IC701 F901 DEG TU001 FRONT TOP MAIN PWB CRT SOCKET PWB SOLDER SIDE TP 47G E1 U T PW UPPER FOCUS LOWER SCREEN TP 47R TP 47B TP E T CRT EARTH WIRE BRAIDED ASS Y ...

Page 16: ...MENT Item Measuring instrument Test point Adjustment part Description Please use signal generator which is correct proof about the sending frequency Adjustment of VCO CW Signal generator Remote control unit 1 VCO 1 Receive the PAL full colour bar 210 25MHz signal 2 Select 1 IF from the SERVICE MENU 3 Press 1 key and select 1 VCO 4 Select VCO ADJUST with MENU key 5 Press MENU key until the colour o...

Page 17: ...HROMA 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 Do not change the initial setting values of the setting items not listed in ADJUSTMENT Initial setting value Colour system Setting item PAL SECAM NTSC 3 5...

Page 18: ...orizontal line glows faintly 8 Press the 2 key to turn off the single horizontal line 9 Press the DISPLAY key twice to return to the normal screen Adjustment of WHITE BALANCE High light Signal generator Remote control unit 2 DRIVE R DRIVE B 1 Receive a black and white signal colour off 2 Select 2 V C from the SERVICE MENU 3 Select 2 DRIVE R B with MENU key and set each value to initial setting val...

Page 19: ... not the best with the initial set value make fine adjustment until you get the best contrast 5 COLOUR Method of adjustment without measuring instrument PAL COLOUR 1 Receive a PAL broadcast 2 Select 2 V C from the SERVICE MENU 3 Select 5 COLOUR with the MENU key 4 Set the initial setting value for PAL COLOUR with the MENU or key 5 If the colour is not the best with the initial set value make fine ...

Page 20: ...AM COLOUR 1 Receive a SECAM full field colour bar signal 75 white 2 Set the initial setting value of SECAM COLOUR with the MENU or key 3 Adjust SECAM COLOUR to bring the value of A in the illustration to 3V W G NTSC 3 58 COLOUR 1 Receive a NTSC 3 58 full field colour bar signal 75 white 2 Set the initial setting value of NTSC 3 58 COLOUR with the MENU or key 3 Adjust NTSC 3 58 COLOUR to bring the ...

Page 21: ... unit NTSC 4 43 TINT When NTSC 3 58 is set NTSC 4 43 will be automatically set at the respective values 6 TINT Method of adjustment using measuring instrument NTSC 3 58 TINT 1 Receive a NTSC 3 58 full field colour bar signal 75 white 2 Select 2 V C from SERVICE MENU 3 Select 6 TINT with the MENU key 4 Set the initial setting value of NTSC 3 58 with the MENU or key 5 Connect the oscilloscope betwee...

Page 22: ...with MENU key 4 Set the initial setting value with the or MENU key 5 Switch the key colour OFF and key colour ON on the remote control and make sure that there is no colour on the black and white screen 6 If the black and white screen is not best with the initial setting value make fine adjustment until you get the best black and white screen 7 Press the DISPLAY key twice to return to the normal s...

Page 23: ... SCURVE 32 0 6 HOR VCO ADJUST Do not adjust 0 0 Item Measuring instrument Test point Adjustment part Description Adjustment of V HEIGHT V POSITION Signal generator Remote control unit 1 VER POSITION 3 VER HEIGHT Vertical frequency 50Hz mode 1 Receive a circle pattern signal 2 Select 3 DEF from SERVICE MENU 3 Select 1 VER POSITION with the MENU key 4 Set the initial setting value with the MENU key ...

Page 24: ...n deteriorated remarkably perform the following steps 14 Receive a cross hatch signal 15 Select 4 VER LINEARITY with the MENU key 16 Set the initial setting value of 4 VER LINEARITY with the MENU key 17 Select 5 VER SCURVE with the MENU key 18 Set the initial setting value of 5 VER SCURVE with the MENU key 19 Adjust 4 VER LINEARITY and 5 VER SCURVE so that the spaces of each line as shown in Fig 4...

Page 25: ... the PICTURE MODE key 3 Adjust the MENU and MENU or key to bring the set values of TINT SHARP to the values shown in the table 4 Respectively select the VSM PRESET mode for STANDARD and SOFT and make similar adjustment as in 3 above SETTING VALUE VSM preset VSM mode Setting item BRIGHT STANDARD SOFT TINT 15 COLOUR 15 BRIGHT 15 CONT 30 15 11 SHARP 15 12 SETTING VALUE OF VSM PRESET BRIGHT TINT COLOU...

Page 26: ...CAM NTSC 3 58 NTSC 4 43 1 C TRAP FIX 0 2 SHARP PEAK 0 3 ABL 1 4 GAMMA 0 TV 0 2 3 5 Y DELAY TIME VIDEO 0 2 0 2 6 BLACK EXP START 3 TV 1 0 7 C BPF VIDEO 1 8 CW SCP 0 9 VIF DET LEVEL 0 11 IF AGC MIN 0 12 VIF AGC 0 13 VIF PMOD 0 19 VNR 15 20 RGB LIM 1 21 RGB LIMIT LEVEL 2 23 TEXT H POSITION 3 24 READ DATA Setting item B G I D K M 10 SIF DET LEVEL 0 14 SIF BPF BW ADJUST 0 15 SIF TRAP FO ADJUST 0 16 SIF...

Page 27: ...nto the center of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that it will not move 10 Input a crosshatch signal 11 Verify that the screen is horizontal 12 Input red and blue raster signals and make sure that purity is properly adjusted CRT WED...

Page 28: ...ke best convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap the lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 3 Repeat 1 and 2 above and make best convergence After adjustment fix the wedge at the original position Fasten the retainer screw of the deflection yoke Fix the 6 magnets with gl...

Page 29: ...4 times if NG is detected more than 13 times it is judged that there is an abnormality When an abnormality has been detected the SUB POWER is turned off While the SUB POWER is being turned off the power key of the remote controller is not operational until the power plug is taken out and put in again CRT NECK protection Operation of CRT NECK protection circuit DITTO DITTO 3 Self check indicating f...

Page 30: ...s 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 indicated in...

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