Sharp 21N52-E1 User Manual

CHROMA CIRCUIT ADJUSTMENT “SECAM”
BELL FILTER ADJUSTMENT: T903
I. Receive “SECAM COLOUR BAR” signal with
colour bar generator.
2. Connect the oscilloscope to TP901 with the
following settings.
l Voltage Range: 0.05 Wdiv., AC
l Sweep Time:
2Ovseddiv.
l Probe:
I/I 0 (3OpF, I OMQ or more)
3. Adjust the Bell Filter (T903) so that the Red and
Blue portions of the colour bar signal should
have the same amplitude.
W Y Cy G Mg R 6
- Same amplitude y
SECAM KILLER ADJUSTMENT: T904
I. Receive “SECAM COLOUR BAR” signal with
colour bar generator.
2. Connect the oscilloscope to TP902 with the
following settings.
l Voltage Range: IV/div., DC
(Adjust vertical position properly.)
l Sweep Time: 20 psec/div.
3. Adjust T904 to obtain maximum DC voltage
(approx. 7.5V) at TP902.
B-Y (T901), R-Y (T902) DISCRIMINATOR ADJUSTMENT
Note: Connect a O.OOlvF capacitor to TP851 and
TP853 respectively to filter out interference
noise.
TP851
rl
I.
2.
3.
4.
5.
Receive “SECAM COLOUR BAR” signal with
colour generator.
Connect the oscilloscope (with two channels)
to TP851 (R-Y) and the TP853 (B-Y), both
located on the CRT Socket Unit (PWB-B) of the
set.
l Voltage Range: ZV/div., DC
l Sweep Time:
IO pseddiv.
Set service switch 5401 at the Video Cut
position to cut-off the Y-signal.
Set both the Contrast and Brightness controls
to their maximum positions.
Adjust T901 and T902 so that the DC output
levels obtained when the colour control is set
to minimum (black and white level) and those
when set to 100% colour saturation become
the same.
6. Return 5401 to CENTER position.
DC OV
9

Sharp 21N52-E1 Specifications

General

Brand	Sharp
Model	21N52-E1
Category	TV
Language	English