Sharp 14VT10X1 Service Manual page 42

3. Set service switch S401 at the Video Cut position
to cut off the Y signal.
4. Adjust the colour control key so that the output
waveform of colour difference signal becomes
1.5 vp-p.
5. Adjust R806 and T801 so that the output
waveform shown in Fig. a is corrected to that
shown in Fig. b.
6. Return 5401 to CENTER (normal position).
Figure a. Waveform before the adjustment
Figure b. Waveform after the adjustment
Sub tint: R882
1. Feed " NTSC COLOUR BAR" signal to video in jack
with colour bar generator at the AV mode.
2. Connectoscilloscope to TP853 (B-Y).
3. Set the TINT VR (R1098) at the center (5110)
position.
4. Set service switch 5401
to cut off the Y signal.
5. Adjust colour control key to obtain the output of
about 3 Vp-p.
6. Adjust sub tint control (R882) so that the output
waveform is as shown in figure below.
7. Return 5401 to CENTER (normal position).
Same level-, ' I
8 - Y *,-'
at
the Video Cut position
, ,
, I
PAL Sub-colour adjustment: R802
1. Receive " PAL COLOUR BAR" signal with colour
generator.
bar
2. Set the control at the " Normal" position that
contrast is Max. (15/15), colour is center (7/15)
and brightness is center (7115) using control, A
and v keys.
3. Connect oscilloscope to the TP852 (Red cathode).
l Range: 2OVIdiv
l Sweep time: 2Opseddiv
4. For PAL colour bar signal reception, adjust R802
so that the white output (75%) and red output
will have the same level.
Same level for the whbte and ted outputs