2SC752 datasheet(11/54 Pages) TOSHIBA

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ELECTRICAL ADJUSTMENTS

Vertical retrace line

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 ap-

pears on the screen.

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

screen.

FOCUS VR ADJ

SUB-BRIGHTNESS

(BRTC)

1. Constrict the picture height until the verti-

cal retrace line appears adjusting the item

HIT (HEIGHT).

2. Adjust the CONTRAST control to the mini-

mum.

3. Call up the adjustment mode display, then

select the item BRTC.

4. Press the VOLUME s or t button so the

belt of vertical retrace line just disappear.

5. Adjust the CONTRAST control for the de-

sired contrast.

6. Perform the HEIGHT adjustment.

ITEM

ADJUSTMENT PROCEDURE

SUB-COLOR

(SCOL)

SUB-TINT

(TNTC)

1. Receive color-bar signal from color-bar

generator.

2. Press the RESET button.

3. Connect oscilloscope to TP501 on SIG-

NAL board.

4. Adjust the CONTRAST control to the

minimum.

5. Call up the adjustment mode display,

then select the item TNTC.

6. Adjust the SUB-TINT by pressing the

VOLUME s or t button to obtain a blue

bar to magenta bar ratio of 3:2 as shown.

7. Press the RESET button.

8. Select the item SCOL.

9. Adjust the SUB-COLOR by pressing the VOLUME s or t button to achieve

1.6V0-p of a blue bar on scope.

10. Check the picture with off-air signal.

Blue

Magenta

3 (1.6V0-P)

WIDTH

(WID)

1. Call up the adjustment mode display, then select the item WID.

2. Press the VOLUME s or t button to get the picture so the left and right edges of

raster begins to lack.

3. Press the VOLUME s or t button to advance the data by 7 steps.

Note : Check the horizontal picture position is correct.

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