akira CT-21XF9, Service Manual

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19
Model No: CT-21XF9A
Version 1.0
3. ADJUSTMENT THE DATA
Pressing of the YELLOW or BLUE button on remote control transmitter will change the value of
data, in the range from 00 to FF. The variable range depends on the adjusting item.
4. EXIT FROM SERVICE MODE
Use the keyboard on remote control transmitter or TV set to turn off the TV once.
SERVICE MODE ADJUSTMENT
1. SUB-BRIGHTNESS
1. Receive colour signals.
2. Set the contrast to maximum and the brightness to medium.
3. Set the chroma to medium.
Enter the TV to the SERVICE mode. Select the BRTC item by pressing the item adjustment button
on the remote transmitter, and set the data to 30 by pressing the data adjustment button. Operate
the TV for 5 min in the mode.
4. Adjust the BRTC data until fuzzy picture does not appear on the high bright area of the screen and
too dim picture not on the low-bright area.
5. Set the contrast and brightness to maximum or minimum, and then test normal picture alternation.
6.
If the picture does not become dark when the contrast and brightness are set to minimum, or not
become bright when set to maximum, then adjust the BRTC data to get normal picture.
2. WHITE BALANCE ADJUSTMENT
1. Turn on the TV and preheat it for over 7 minute.
2. Use the remote control to set the contrast to maximum and the brightness to medium.
Set the chroma to minimum.
3. Enter the TV to the SERVICE mode, and set the following data without changing other items.
RCUT ............4F
GCUT ............8D
BCUT ............60
GDRN ............40
BDRN ............40
4. Pull out the external antenna and press the MUTE button once on the remote control until a bright
horizontal line appears on the screen. Adjust the GCUT data to get 160V ± 0.5 green gun voltage
across the Y board.
5. Adjust the RCUT and BCUT data according to the given at Step 4 so that the bright horizontal line
turns to yellow, then to white.
3. HORIZONTAL CENTERING ADJUSTMENT
Enter the TV to the service mode, and receive Philips test signal. Select the HPOS or HPS item by
pressing the item adjustment button on the remote control, and adjust horizontal picture position in the
centre of screen by pressing the data, adjustment button.
4. VERTICAL CENTERING ADJUSTMENT
Enter the TV to the service mode, and receive Philips test signal. Select the VPS0 or VP60 item by
pressing the item adjustment button on the remote transmitter, and adjust vertical picture position in the
centre of screen by pressing the data adjustment button.