18 No. 52016

AV-21W83

AV-21W93

AV-21W93B

ADJUSTMENTS

Item

Measuring

instrument

Test point Adjustment part Description

Check of

B1 POWER

SUPPLY

Signal

Generator

DC Voltmeter

B1 (pin 1)

GND (pin 5)

[CN00S

connector

in MAIN

PWB]

1. Receive a black and white signal.

2. Connect a DC voltmeter between B1 and GND

(between pin 1 and 5 of the connector CN00S).

3. Make sure that the voltage is DC135 ± 1.5V.

Adjustment

of FOCUS

FOCUS VR

[In HVT]

Item

Measuring

instrument

Test point Adjustment part Description

FOCUS ADJUSTMENT

B1 POWER SUPPLY

Signal

generator

Notes:

• Set PICTURE MODE (VSM) to “BRIGHT”.

• The final adjustment of CONVERGENCE must be done after the

FOCUS adjustment. (CONVERGENCE is changed by FOCUS ad-

justment.)

When makes difference by FOCUS adjustment, should be reconfirming

PURITY adjustment.

1. Receive a cross-hatch signal.

2. While looking at the screen centre, adjust the FOCUS VR so that

the vertical and horizontal lines will be clear and in fine detail.

3. Make sure that the picture is in focus even when the screen gets

darkened.

Adjustment

of VCO (CW)

VCO (CW)

Item

Measuring

instrument

Test point Adjustment part Description

IF CIRCUIT ADJUSTMENTS

Remote

control unit

Note:

• Under normal conditions, no adjustment is required.

1. Select 1. IF from the SERVICE MENU.

2. Select 1. VCO by pressing the 1 key on the remote control unit.

3. Receive a broadcast signal.

4. Check the characters colour of the BELOW REFERENCE displayed

to yellow.

5. Press the DISPLAY key three times to return to normal screen.

TOO HIGH

ABOVE REFERENCE

BELOW REFERENCE

TOO LOW

VCO (CW)

. MHz

DISPLAY : EXIT

fv

YELLOW

Adjustment

of DELAY

POINT

(AGC

TAKE-OVER)

DELAY POINT

Remote

control unit

1. Receive a black and white broadcast signal (colour off).

2. Select 1. IF from the SERVICE MENU.

3. Select 2. DELAY POINT by pressing the 2 key on the remote con-

trol unit.

4. Adjust the MENU */T key in order to eliminate any noise or beat

from the image. Any increase above the initial value produces noise

and any decrease below it produces beat.

5. Press the DISPLAY key three times to return to the normal screen.

6. Turn to other channels and make sure that there are no irregulari-

ties.

Setting

Initial setting value

(Adjustment time)

DELAY POINT

26

(AGC TAKE-OVER)

tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522

Brand	JVC
Model	AV-21W83
Category	TV
Language	English

JVC AV-21W83 User Manual

Table of Contents

Questions and Answers:

JVC AV-21W83 Specifications

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