3-6. Sub Brightness Adjustment; 3-7. Sub Contrast Adjustment; Sub Color Adjustment; 3-9. Tuner Agc Adjustment - Sony TRINITRON KV-21CT1B Servicehandbuch

KV-21CT1B/21CT1U/21CT1E/21CT1K

3-6. SUB BRIGHTNESS ADJUSTMENT

1. Input a PAL monoscope pattern.
2. Go to Test Mode.
3. Press 'Test' 'Test 13' on the Remote commander.
PICTURE MINIMUM, BRIGHTNESS 50%
4. Select WHBL "SBRT" by pressing right
button and adjust "SBRT" data. To adjust the data,
again press right
data until there is barely a difference between 0 IRE
and 10 IRE signal levels.

3-7. SUB CONTRAST ADJUSTMENT

1. Select Video Mode.
2. Input PAL Colour Bar to TV set.
3. Set the following condition:
PICTURE 100%, COLOUR 0%, BRIGHTNESS 50%
(IN PERSONAL MODE)
4. Connect an oscilloscope to pin 4 (R output) of CN004.
5. Enter Service Menu.
6. Set PICT 03 "PWL" to 00 and WHBL 17 "BLBG" to 01.
7. Select SADJ "PMAX" with right
commander then adjust VR within spec with right
left button.
VR = 1.50 ± 0.03 Vp-p
(Difference is within 30mV)
8. Set "PWL" and "BLBG" back to initial data respectively.
1. Input a video signal that contains a small 100% white
area on a black background.
2. Connect a digital voltmeter to pin 10 of J751 (C board).
3. Adjust the sub-contrast ("TT11") to obtain a voltage of
86+/–5V.
RM-W100
or left
to increase or left to decrease the
or left button of the
VR
OR
3-8. SUB COLOUR ADJUSTMENT
1. Receive a PAL colour bar signal.
2. Connect an oscilloscope to Pin 2 of CN004(A board).
3. Enter into the Service Menu.
4 Set PICT 06 "WTS" to 00.
5. Adjust SADJ "SCOL" data so that the cyan, magenta
and blue colour bars are equal level.
B-Out Waveform

3-9. TUNER AGC ADJUSTMENT

Note: There should be no need to adjust the AGC as this
is pre-adjusted during manufacturing. If the AGC
does need adjustment then follow steps 1 to 4 as
below.
1. Receive a signal of 61dBuV/75ohm terminated via the
or
tuner antenna socket.
2. Connect a voltmeter to the AGC pin 5 of CN904 (mount
side of A board).
3. Confirm that the AGC voltage is 3.2volts +/–0.5volts.
4. If adjustment is required, then re-adjust the AGCT in
service menu to obtain a voltage of 3.2V +/–0.5V.
[ Print side of A board ]
– 26 –
same level
PIN 5