JVC AV-29V514/B Adjustment Procedure, B1 Voltage, Focus Adjustment, If Circuit Adjustments, Agc

4.7ADJUSTMENT PROCEDURE

4.7.1 B1 VOLTAGE

Item

Measuring

Test point

Adjustment part

Description

instrument

B1 VOLTAGE

Signal

B1 (pin 1)

(1)

Receive a black and white signal.

check

generator

GND (pin 5)

(2)

Connect a DC voltmeter between B1 and GND

[CN00X

(between pins 1 and 5 of the connector CN00X).

DC voltmeter

connector in

(3)

Make sure that the voltage is DC134.5V ± 2V.

MAIN PWB]

4.7.2 FOCUS ADJUSTMENT

Item

Measuring

Test point

Adjustment part

Description

instrument

FOCUS

Signal

FOCUS VR

Notes:

adjustment

generator

[In HVT]

• Set PICTURE MODE (VSM) to "BRIGHT".

• The final adjustment of CONVERGENCE must be

done after the FOCUS adjustment. (CONVERGENCE

is affected by the FOCUS adjustment.)

If any aeviation in CONVERGENCE is found, PURITY

must be adjusted to restore the convergence.

(1)

Receive a crosshatch signal.

(2)

Adjust the FOCUS VR so that the vertical and

horizontal lines will be clear and in fine detail on the

screen.

(3)

Make sure that the picture is in focus even when the

screen gets darkened.

4.7.3 IF CIRCUIT ADJUSTMENTS

Item

Measuring

Test point

Adjustment part

Description

instrument

IF VCO

Remote

[1. IF]

Note:

check

control unit

1. VCO (CW)

• Under normal conditions, no adjustment is required.

(1)

Receive a broadcast signal.

VCO (CW) .

Receiving frequency

(2)

Select 1. IF from the SERVICE MENU.

MHz

(3)

Select 1. VCO.

TOO HIGH

(4)

Check the characters colour of the JUST

REFERENCE displayed to yellow.

ABOVE REFERENCE

(5)

JUST REFERENCE

YELLOW

Press the [DISPLAY] key three times to return to

BELOW REFERENCE

normal screen.

TOO LOW

DISPLAY : EXIT

DELAY POINT

Remote

[1. IF]

(1)

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

(AGC

control unit

2. DELAY POINT

(2)

Select 1. IF from the SERVICE MENU.

TAKE-OVER)

(3)

Select 2. DELAY POINT.

adjustment

(4)

Adjust in order to eliminate any noise or beat from

the image. Any increase above the initial value

Initial setting value

produces the noise and any decrease below it

Adjustment item

NTSC 3.58

OTHERS

produces the beat.

VHF

UHF

VHF

UHF

(5)

Press the [DISPLAY] key three times to return to the

normal screen.

2. DELAY POINT

35

35

35

35

(6)

Turn to other channels and make sure that there are

(AGC TAKE-OVER)

no irregularities.

(No.YA139)1-17