Sharp 21N52-E1 - CHROMA CIRCUIT ADJUSTMENT PAL; PAL CHROMA ADJUSTMENT

CHROMA CIRCUIT ADJUSTMENT “PAL”
PAL CHROMA ADJUSTMENT
l R806:
1 H-delay amp. control
. T801:
1 H-delay phase control
Note: PIFIAFTIAGC adjustments should have
been completed before starting this adjustment.
1. Receive the “PAL COLOUR BAR” signal with
colour bar generator.
2. Connect the following resistance matrix to pins
3 and 4 of the connector (K), to which an
osci I loscope is connected.
22 ka
(Q-4 Ahh
Resistance Matrix
3. Set service switch S401 at the Video Cut
position to cut-off the Y-signal.
4. Turn on the “N” key the remote controller.
5. Adjust the Colour control key of the remote
controller so that the output waveform of
colour difference signal becomes Z.SVp-p.
6. Adjust IH-delay amp. control (R806) and 1 H-
delay phase control (T801) so that the output
waveform shown in Fig. a is corrected to that
shown in Fig. 6.
7. Return 5401 to CENTER position.
W Y Cy G Mq R B
Figure a. Waveform before the adjustment
-
c
Figure b. Waveform after the adjustment
PAL SUB-COLOUR ADJUSTMENT: R802
1. Receive the “PAL COLOUR BAR” signal with
colour bar generator.
2. Turn on the “N” key on the remote controller.
3. Connect oscilloscope to the TP852 (red
cathode).
l Voltage Range: ZOV/div.
l Sweep time: 20psec/div.
4. Adjust R802 so that the white signal (75%) and
red signal have the same level.
E -
W
CY G W
T
Same level for the white and red outputs.
8