ELECTRICAL ADJUSTMENT
ITEMADJUSTMENT PROCEDURE
VERTICAL POSITION (VCEN)1. Call up the adjustment mode display, then select item VCEN.
2. Press the VOLUME s or t button to get the voltage 0 ?10 mV.
3. Measuring the terminals voltage are TP-V and TP-G on SIGNAL Board.
SUB-BRIGHTNESS1. Constrict the picture height until the
(BRTC)vertical retrace line appears adjusting
the HEIGHT control on the MAIN board.
2. Adjust the CONTRAST to the minimum
and BRIGHTNESS to the center.
GENERAL ADJUSTMENTS
3. Enter the service mode, then select
OBRTC � register.
4. Adjust the data value so the belt of
vertical retrace line just disappear.
5. Adjust the HEIGHT control.
* Adjust the SUB-BRIGHTENESS after
adjusting the WHITE BALANCE.Vertical retrace line
SUB-COLOR1. Receive color-bar signal from color-bar generator.
(SCOL)2. Adjust the BRIGHTNESS and CONTRAST to the center (RESET status).
SUB-TINT3. Connect oscilloscope to TP501on the MAIN board.
(TNTC)4. Enter the service mode, then select SCOL �.O
5. Temporarily adjust the data value to
achieve about 1V0-p of blue bar.Blue
SPECIFIC INFORMATIONS6. Select OTNTC � register.
Magenta
7. Adjust the data value to obtain the blue3 (1.8V0-P)
bar to magenta bar ratio of 3:2 as2
shown.0
8. Select OSCOL � register.
9. Adjust the data value to achieve 1.8V
0-p
of blue bar on scope.
10. Check the picture with off-air signal.
SUB-CONTRAST1. Tune in a color program and adjust the BRIGHTNESS and CONTRAST to
(SCNT)normal mode(RESET).
2. Enter the service mode, then select "SCNT" register.
3. Change "SCNT" data to13H.
4. Check the picture contrast.
PICTURE POSITION1. Receive the pattern signal which shows it's center
on the screen.
2. Adjust the picture position alternately by turning
CENTERING MAGNETS for proper picture position.
3. Check the picture with off-air signal.
� 12 � |
ACEC
