Toshiba 19A20 Manual de servicio - Página 12

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1. Circuit Block Diagram

ITEM

FOCUS VR ADJ.

SUB-BRIGHTNESS

(BRTC)

SUB-COLOR

(COLC)

SUB-TINT

(TNTC)

HORIZONTAL POSITION

(HPOS)

VERTICAL POSITION

(VPOS)

HEIGHT

(HIT)

ELECTRICAL ADJUSTMENTS

ADJUSTMENT PROCEDURE

1. Enter the service mode, then select any register item.

2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern

appears on the screen.

3. Adjust the FOCUS control (on T461) for well defined scanning lines on the

picture screen.

1. Constrict the picture height until the

vertical retrace line appears adjusting the

HEIGHT control on the MAIN board.

2. Adjust the CONTRAST to the minimum

and BRIGHTNESS to the center.

3. Enter the service mode, then select

"BRTC" register.

4. Adjust the data value so the belt of

vertical retrace line just disappear.

5. Adjust the CONTRAST for the desired

contrast.

6. Adjust the HEIGHT control.

1. Receive color-bar signal from color-bar generator.

2. Adjust the BRIGHTNESS and CONTRAST to the center (RESET status).

3. Connect oscilloscope pin 23 of Q501 on the MAIN board.

4. Enter the service mode, then select "COLC".

5. Temporarily adjust the data value to

achieve about 1V

of blue bar.

0-p

6. Select "TNTC" register.

7. Adjust the data value to obtain the blue

bar to magenta bar ratio of 3:2 as

shown.

8. Select "COLC" register.

9. Adjust the data value to achieve 1.25V

of blue bar on scope.

10. Check the picture with off-air signal.

1. Call up the adjustment mode display, then select the Item HPOS or VPOS.

2. Press the TV/VIDEO button until the white cross-bar

or black cross-bar pattern appears on the screen.

3. Adjust the HORIZONTAL and VERTICAL position

alternately by pressing the VOLUME s or t button

for proper picture position.

4. Check the picture with off-air signal.

1. Call up the adjustment mode display, then select the Item HIT.

2. Press the VOLUME s or t button to get the picture so the top of raster begins

to lack.

3. Press the VOLUME s button to advance the data by 8 steps.

Note : Check the vertical picture position is correct.

– 12 –

Vertical retrace line

Blue

Magenta

0-p

3 (1.25V

)

0-P