SECTION 4

ADJUSTMENT

4.1ADJUSTMENT PREPARATION

(1)There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.

(2)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.

(3)Make sure that connection is correctly made AC to AC power source.

(4)Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.

(5)If the receive or input signal is not specified, use the most appropriate signal for adjustment.

(6)Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service adjustment.

4.2PRESET SETTING BEFORE ADJUSTMENT

Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.

Item

Preset value

 

 

PICTURE MODE(VSM)

BRIGHT

 

 

VNR

OFF

 

 

AI ECO SENSOR

OFF

 

 

BALANCE

Centre

 

 

BASS / TREBLE / BALANCE

Centre

 

 

CINEMA SURROUND

OFF

 

 

4.3MEASURING INSTRUMENT AND FIXTURES

(1)DC voltmeter (or digital voltmeter)

(2)Oscilloscope

(3)HV voltmeter

(4)Signal generator

(Pattern generator : PAL/NTSC)

(5)Remote control unit

4.4ADJUSTMENT ITEMS

„CHECK ITEMS

•B1 VOLTAGE check

•HIGH VOLTAGE check

•IF VCO check

„TUNER / IF CIRCUIT

•DELAY POINT (AGC) adjustment

„FOCUS

•FOCUS adjustment

„DEFLECTION CIRCUIT

•V.SLOPE adjustment

•V.POSITION adjustment

•V.SIZE adjustment

•H.POSITION adjustment

•H.SIZE adjustment [Except AV-21MXP6/V]

•SIDE PIN adjustment [Except AV-21MXP6/V]

•TRAPEZIUM adjustment [Except AV-21MXP6/V]

•V. LINEARITY adjustment

•CORNER adjustment [Except AV-21MXP6/V]

•H. PARALLEL adjustment

•H.BOW adjustment

„VIDEO CIRCUIT

•WHITE BALANCE adjustment

•SUB BRIGHT adjustment

•SUB CONTRAST adjustment

•SUB COLOUR adjustment

•SUB TINT adjustment

„VSM PRESET SETTING

•VSM PRESET

„PURITY AND CONVERGENCE

•PURITY adjustment

•STATIC CONVERGENCE adjustment

•DYNAMIC CONVERGENCE adjustment

1-16 (No.YA476)

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JVC AV-21MXP6/V Adjustment Preparation, Preset Setting Before Adjustment, Measuring Instrument and Fixtures, „ Focus
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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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