4.9.2 TUNER / IF CIRCUIT

 

Item

Measuring

Test point

Adjustment part

 

Description

 

instrument

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DELAY POINT

Signal

 

 

[1. IF]

(1)

Receive a black and white signal (colour off).

(AGC)

generator

 

 

2. DELAY POINT

(2)

Select 1. IF.

 

 

Remote

 

 

(AGC TAKE-OVER)

(3)

Select <2. DELAY POINT>.

 

 

 

 

 

 

(4)

Set the setting values of the setting items as shown

 

 

control unit

 

 

 

 

 

bellow table.

 

 

 

 

 

 

 

 

(5)

Then adjust the [MENU - / +] keys until video noise

 

 

 

 

 

 

 

 

 

Setting Item

Variable range

 

Initial setting value

 

 

disappears.

 

 

 

(6)

Turn to other channels and make sure that there are

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no irregularities.

 

DELAY POINT

 

NTSC3.58

 

 

28

 

 

 

 

 

0 - 127

 

 

 

 

 

 

(AGC TAKE-OVER)

OTHER

 

28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.9.3 FOCUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Item

Measuring

Test point

Adjustment part

 

Description

 

instrument

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FOCUS

Signal

 

 

FOCUS VR

(1)

Receive the cross hatch signal.

 

 

generator

 

 

[In HVT]

(2)

While looking at the screen, adjust the FOCUS VR

 

 

 

 

 

 

 

 

 

to the vertical and horizontal lines will be thinnest

 

 

 

 

 

 

 

 

 

and sharpest.

 

 

 

 

 

 

 

 

(3)

Make sure that the picture is in focus even when the

 

 

 

 

 

 

 

 

 

screen gets darkened.

4.9.4 DEFLECTION CIRCUIT

•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.

•When performing deflection circuit adjustment, adjusts PAL signal (fv: 50 Hz) in 4:3 mode and 16:9 mode respectively, and adjust

the NTSC signal (fv: 60 Hz) similarly.

NOTE:

Proceed to the following adjustment after having completed the adjustments of SUB BRIGHT and SUB PICTURE.

„COMPRESS: OFF (4:3)

Item

Measuring

Test point

 

 

Adjustment part

 

Description

instrument

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V. SLOPE

Signal

 

 

[4. DEF]

PAL V. SLOPE

 

generator

 

 

2. V-SLOPE

(1) Receive a circle pattern signal of vertical frequency

 

Remote

 

 

 

 

 

 

 

50Hz (PAL).

 

 

 

 

 

 

 

(2)

Select 4. DEF from the SERVICE MODE.

 

control unit

 

 

 

 

 

 

(3)

Select <2. V-SLOPE>.

 

 

 

 

 

 

 

 

 

(4)

Set the initial setting value of <2. V-SLOPE>.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(5)

Adjust <2. V-SLOPE>to make "A = B".

 

 

 

 

 

 

 

 

 

(6)

Press the [OK] key to memorize the set values.

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

NTSC V. SLOPE

 

 

 

 

 

 

 

 

Blanking line

(1)

Receive a circle pattern signal of vertical frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60Hz (NTSC).

 

 

 

 

B

 

 

 

 

(2)

Follow the same step 2 to 6 as in PAL V. SLOPE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-30 (No.YA476)

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JVC AV-25MXP6/V Tuner / if Circuit, Delay Point, Agc, Focus, Deflection Circuit, „ Compress OFF, PAL V. Slope
Page 29 Page 31

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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