JVC AV-25MXP6/V, AV-21MXP6/V, AV-29MXP6/V service manual Memory IC Replacement, Menu

Page 12

3.4MEMORY IC REPLACEMENT

• This model uses the memory IC.

Memory IC: IC702 on MAIN PWB

The memory IC memorizes data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure to use the same type IC written with the initial values of data. In other words, use the specific IC listed in "PRINTED WIRING BOARD PARTS LIST". For its mounting location, refer to "ADJUSTMENT LOCATIONS".

3.4.1 MEMORY IC REPLACEMENT PROCEDURE 1. Power off

Switch off the power and disconnect the power plug from the AC outlet.

2.Replace the memory IC

Be sure to use the memory IC written with the initial setting values.

3.Power on

Connect the power plug to the AC outlet and switch on the power.

4. System constant check and setting

* It must not adjust without signal.

(1)Press the [DISPLAY] key and the [PICTURE MODE] key of the REMOTE CONTROL UNIT simultaneously.

(2)The SERVICE MODE screen of Fig. 1 will be displayed.

(3)While the SERVICE MODE is displayed, press the [DISPLAY] key and the [PICTURE MODE] key simultaneously, and the SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.

(4)Check the setting values of the SYSTEM CONSTANT SET. 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 [OK] key to memorize the setting value.

(6)Press the [DISPLAY] key twice, and return to the normal screen.

5.Receiving channel setting

Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.

6.User settings

Check the user setting items according to the given in page later.

Where these do not agree, refer to the OPERATING INSTRUCTIONS and set the items as described.

7. SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is necessary (Fig.1).

Refer to the SERVICE ADJUSTMENT for setting.

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

DISPLAY key

EXIT

MENU

key

MENU key

 

MENU

key

OK key

 

MENU

key

 

 

 

PICTURE MODE

 

 

 

key

 

 

 

SERVICE MENU

SERVICE MENU

1. IF

2. V/C

3. AUDIO

4. DEF

5. VSM W/B

6. S TATUS

7. PLUG & PLAY (ON)

1-7 : SELECT

DISPLAY : EXIT

******* **** ***** *****

******** *** ***

Fig.1

SYSTEM CONSTANT-1

SYSTEM CONSTANT SET 1

SYSTEM

: MULTI

COMB

:NO

TILT

:NO

SUPER BASS

:NO

TEXT

:NO

LANGUAGE

:EV

: SEL

: OPE DISP : EXIT

SYSTEM CONSTANT-2

SYSTEM CONSTANT SET 2

SOUND

 

:PB

BILINGUAL

 

:NO

BLUE BACK MUTE

:NO

COLOUR AUTO

 

:NO

ECO SENSOR

 

:ECO

INTER CARRIER

 

:NO

: SEL

: OPE

DISP : EXIT

SYSTEM CONSTANT-3

SYSTEM CONSTANT SET 3

SURROUND

 

:YES

PICTURE BOOSTER

:NO

COMPONENT

 

:YES

PIP

 

:YES

S INPUT

 

:YES

MAXX BASS

 

:YES

: SEL

: OPE

DISP : EXIT

Fig.2

1-12 (No.YA476)

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Contents AV-29MXP6/V Items Contents AV-21MXP6/V AV-25MXP6/V AV-29MXP6/VSafety Precautions Leakage Current CheckAlternate Check Method No.YA4761-3Features DVD Picture Mode Auto Signal DetectPicture Mode Cinema SurroundTechninal Information Main MI-COM CPU PIN Function No.YA4761-5Disassembly Procedure AV-21MXP6/V Removing the Rear Cover Wire Clamping and Cable TyingRemoving the Main PW Board Removing the SpeakerAV-21MXP6/X No.YA4761-7Disassembly Procedure AV-25MXP6/V Removing the Rear Cover AV-25MXP6/V No.YA4761-9Disassembly Procedure AV-29MXP6/V Removing the Rear Cover Removing the Chassis Chassis Base and Control BaseRemoving the AV Terminal Board Remove the Rear Cover Remove the 4 screws C as shownFront Side No.YA4761-11Memory IC Replacement MenuSystem Constant Setting Settings of Factory Shipment Button OperationRemote Control Direct Operation Remote Control Menu Operation Picture SettingFeature Setting Install SettingService Mode Setting Items VSM PresetReplacement of Chip Component How to install Chip parts Resistors, capacitors, etcSoldering Iron Transistors, diodes, variable resistors, etcAdjustment Preparation Preset Setting Before AdjustmentAdjustment Items „ Check Items „ VSM Preset SettingAdjustment Location AV-21MXP6/V, AV-25MXP6/V FrontNo.YA4761-17 Adjustment Location AV-29MXP6/V Main PWB ASS’Y CRT Socket18 No.YA476 Service Mode Items Setting MethodMemorize the Adjustment Data Release of Service ModeService Mode Flow Chart 20 No.YA476Initial Setting Value of Service Mode PAL Secam NTSC3 NTSC4 Video32 ~ +31 No.YA4761-2122 No.YA476 No.YA4761-23 AV-21MXP6/V Function Mode100Hz 300Hz 1kHz 3kHz 8kHz AV-25MXP6/V FunctionAV-29MXP6/V Function +12+11 No.YA4761-25Compress 43 50Hz Others 60HzS.CR 32 ~ +31 LIN 32 ~ +3143 50Hz 50Hz 60HzBright Soft TheaterCool Warm Normal Theater Adjustment Procedure Check Item Measuring Test point Adjustment part Description InstrumentB1 Voltage High Voltage HV voltmeterDelay Point Tuner / if CircuitAGC FocusPosition PAL V. PositionNtsc V. Position SizePAL H. Size Ntsc H. SizeSide PIN PAL Side PINLinearity PAL V. LinearityNtsc V. Linearity Corner PINBOW PAL H. BOWNtsc H. BOW Follow the same to 7 as in PAL Side PIN PAL Trapezium PINNtsc Trapezium PIN Select 8. COR-UP„ Video 2 SET Component Video CircuitWhite Composite White BalanceSUB Bright SUBContrast SUB ColourSUB Tint PAL TintNtsc 3.58 Tint Ntsc 4.43 TintVSM Preset Setting STANDARD, Soft and Theater1. R Drive to 3. B Drive to the values Warm and NormalPurity and Convergence „ Purity Adjustment „ Static Convergence Adjustment „ Dynamic Convergence AdjustmentNo.YA4761-41 Indication by the Power LED Self Check Functions OutlineSelf Check Items Self Check Indicating FunctionVPT Schematic Diagrams Copyright 2006 Victor Company of Japan, LimitedSafety Indication of Parts Symbol ExampleIndications on the Circuit Diagram Specified Voltage and Waveform ValuesContents AV-21MXP6/V, AV-25MXP6/V AV-29MXP6/VMain PWB Pattern 2No.YA476Main PWB No.YA4762-32-4No.YA476Front Control PWB1/2 Main PWB Circuit Diagram AV-21MXP6/V 1/4 2/4 SHEET1 No.YA4762-72-8No.YA476Main PWB Circuit Diagram AV-21MXP6/V 3/44/4 SHEET2 No.YA4762-92-10No.YA476Main PWB Circuit Diagram AV-25MXP6/V 1/4 2/4 Sheet No.YA4762-112-12No.YA476Main PWB Circuit Diagram AV-25MXP6/V 3/44/4 SHEET4 No.YA4762-132-14No.YA476Main PWB Circuit Diagram AV-29MXP6/V 1/2 Sheet No.YA4762-152-16No.YA476Main PWB Circuit Diagram AV-29MXP6/V 2/2 Sheet No.YA4762-172-18No.YA476CRT Socket PWB Circuit Diagram AV-29MXP6/V Sheet No.YA4762-192-20No.YA476Front Control PWB Circuit Diagram AV-29MXP6/V Sheet No.YA4762-212-22No.YA476Bass PWB Circuit Diagram Sheet No.YA4762-232-24No.YA476Front No.YA4762-25 26No.YA476Main PWB Pattern AV-29MXP6/V No.YA4762-272-28No.YA476CRT Socket PWB Pattern AV-29MXP6/V Bass PWB Pattern Solder SideBass PWB Pattern Parts Side No.YA4762-292-30No.YA476Front Control PWB Pattern AV-29MXP6/V No.YA4762-312-32No.YA476Voltage Charts AV-21MXP6/V, AV-25MXP6/V No.YA4762-332-34No.YA476Waveforms AV-21MXP6/V, AV-25MXP6/V No.YA4762-3536No.YA476 Main PWBNo.YA476 Parts List No.YA4763-1Contents Using P.W. Board & Remote Control Unit No.YA4763-3100 V01 L01 101 102 106 103 105 104 T5224No.YA476 Printed Wiring Board Parts List No.YA4763-56No.YA476 No.YA4763-7 8No.YA476 No.YA4763-9 487 5 10No.YA476No.YA4763-11 V01 L01 100 101 102 106 103 105 104 12No.YA476Main P.W. Board Assy SCW-1646A-H2 No.YA4763-1314No.YA476 No.YA4763-15 16No.YA476 No.YA4763-17 18No.YA476 B Assy AV-29MXP6/VV01 L01 100 101 103 DY01 2822 3018 102 40 T522 No.YA4763-19Main P.W. Board Assy SCW-1647A-H2 20No.YA476No.YA4763-21 22No.YA476 No.YA4763-23 CRT Socket P.W. Board Assy SCW-3037A-H2 24No.YA476Bass P.W. Board Assy SCW-6003A-H2 No.YA4763-25Packing Packing Parts List Colour Television Do not allow objects or liquid into the cabinet openings Knowing your TV’s features Main featuresRemote control buttons and basic functions No. PressRemote control buttons and basic functions TV buttons and functions Front of the TVSetting up your TV Turn off the equipment including the TV before connectingSetting up your TV Basic setting for picture Picture ModeColour System Picture Setting White Balance Picture BoosterAdvanced setting for picture AI ECO Sensor ECO/ECO ModeCompress Blue BackOriginal features for picture PIPBasic setting for sound Sound ModeSound System BalanceAdvanced setting for sound AI VolumeCinema Surround EqualizerAuto Signal Detect DVD Picture ModeDVD Sound Mode DVD MenuCustomized setting VIDEO-2 Setting Display BeepTV channel presetting Auto ProgramDelete TV channel presetting CH/CC number Before connecting Additional preparationTroubleshooting Specifications AV-25MXP6Model AV-29B316 AV-29M316 AV-29S356 AV-29B316BK

AV-29MXP6/V, AV-21MXP6/V, AV-25MXP6/V specifications

The JVC AV-25MXP6/V, AV-21MXP6/V, and AV-29MXP6/V are a trio of high-performance CRT televisions that represent a combination of cutting-edge technology and practical design, catering to the diverse needs of home entertainment enthusiasts. These models are characterized by their impressive picture quality, robust build, and user-friendly features, making them a prominent choice during their production era.

One of the key features of these models is their screen sizes, which cater to different room sizes and viewing preferences. The AV-25MXP6/V offers a compact 25-inch display, ideal for smaller living spaces or bedrooms, while the AV-21MXP6/V with its 21-inch screen is perfect for desk setups or as a secondary television. The AV-29MXP6/V, on the other hand, boasts a larger 29-inch display, making it suitable for home theaters or larger family rooms.

JVC is renowned for its superior picture technology, and these models are no exception. They utilize a high-quality CRT screen that provides deep contrast, vivid colors, and sharp details. The picture performance is further enhanced by JVC's proprietary circuitry, including a dynamic contrast system that adjusts brightness and contrast levels based on the content being displayed, resulting in a more immersive viewing experience.

Moreover, these televisions come equipped with several input options, including RF, composite, and S-video inputs, allowing users to connect multiple external devices such as DVD players, game consoles, and VCRs. With built-in tuners, viewers can easily access over-the-air broadcasting, making these models versatile entertainment hubs.

Another noteworthy characteristic is the user-friendly interface that JVC has engineered into the AV-25MXP6/V, AV-21MXP6/V, and AV-29MXP6/V models. The on-screen menu provides quick access to settings and customization options, allowing users to tailor the viewing experience to their preferences, including the ability to adjust color tones and picture settings.

In addition to their functionality, these televisions also sport an elegant design that incorporates a sleek frame and aesthetically pleasing finish, making them a suitable complement to any home décor.

Overall, the JVC AV-25MXP6/V, AV-21MXP6/V, and AV-29MXP6/V models represent a harmonious blend of technology, style, and user-centric features, making them reliable choices for anyone seeking quality CRT televisions for their home entertainment needs. Though newer technologies have since emerged, these models remain a fond memory for many who experienced their remarkable performance.
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