Audiovox CX15 Service Manual download pdf (Page 31)

PT3-H AVC3-U

2.2 FACTORY AND SERVICE ADJUSTMENTS

The adjustment item that is affected by the memory

initialize operation is shown below:

3 AMPLITUDE ADJUSTMENT

(AVC CENTER)

3.1 RGB AMPLITUDE ADJUSTMENT

Preparation

(1) Select “Video” - “Picture Mode” - “Day” - “Reset”. Set

“Reset” of “Video” menu when PC input is selected.

(2) Input 525p(480p) of RGB amplitude adj. signal into

INPUT1(Component) input.

(3) Input VGA(60Hz) RGB amplitude adj. signal into

RGB input.

Note: Perform pre heat-run for more than 30 min. before

adjusting.

Adjustment

(1) Receive 525p(480p) signal (Aspect 16:9 Standard).

(2) Select ‘RGB(480p)’ of Service Adj. menu. Press

right cursor key () over 2 seconds and have it

perform automatic adjustment. When it’s completed,

‘Auto Adjusting’ on the screen will disappear.

(3) Receive PC signal (VGA(60Hz)), (Aspect Full).

(4) Similarly as (2), select ‘RGB(PC)’ of Service Adj.

Menu, by pressing SEL button. Press  for 2 sec. to

do automatic adjustment.

3.2 SUB-CONTRAST ADJUSTMENT

This adjustment is only necessary if picture contrast

seems to be deficient, memory initialization was done

without making a note of the settings, or if the IC I001

(main micon) or I003 (EEPROM) were changed.

Preparation

(1) Receive Sub-contrast adjustment signal (Fig. 1).

Adjustment

(1) Select ‘SUB CONTRAST’ of Service Adj. Menu.

Press  for over 2 seconds and have it perform

automatic adjustment. When it’s completed, ‘Auto

Adjusting’ on the screen will be disappeared.

Fig. 1

Full White

(RF Input ANT A))

=1.0 Vp-p (when

=100IRE)

Procedure 2

(1) Short PRST connector on the AVC PWB and check

that the set return to delivery settings (CH 03).

(2) Do not unplug from AC outlet until this operation is

completed and do not perform any key operation

either. After this operation, each factory setting and

adjust mode data should reset to delivery setting

automatically.

3.3 BRIGHTNESS CHECK

Preparation

(1) Start checking 20 minutes or more after the power is

turned ON.

(2) Receive the color bar signal.

(3) The vertical incident illumination on the screen

should be 20 lux or less.

(4) Picture Format is 16:9 standard mode.

(5) Select Day mode and reset.

Checking Procedure

(1) Check the brightness as below.

Note: If set black level is NG, readjust item 3.1 RGB

amp. adj. and 3.2 Sub Contrast adj.

Measuring Conditions

(1) At the signal electric field strength 75± dBu, the

specification mentioned above should be satisfied.

(2) At the input electric field 46-106dBu, there should be

no abnormality.

* From color bar pattern below.

AVC51

Can be seen at black A3*

Can be seen slightly from black A5*

RGB amplitude adj. signal

Black

White

0.7V

Recommended Equipment:

ASTRO VG-823 Digital Video Generator

with RB-649 Remote Box.

-Remarks

White 100%

7 step gray scale

4 has tolerance.

4 can be between black and

Slightly from black.

Color Bar Signal

Adj. Items Memory Init.

W/B Init.(No need to

use)

Video white blance Adj. affect

PC white blance Adj. affect

Video RGB Amplitude Adj.

PC RGB Amplitude Adj.

Sub-contrast Adj.

affect

(M-CONT4;

S-CONT4)

change of FC-unit

change of PDP-

module or change

of I002(EEPROM)

on SIG/AUDIO PWB

change of

I003(EEPROM) on

AV PWB or Memory

Init.

Adj.

Initialization

Adjustment

BACK TO ADJUSTMENTS

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Audiovox CX15 Service Manual Page 31

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