27
SET-UP FOR ADJUSTMENT
Color bar signal of a pattern generator
Precautions before starting adjustment
Satisfy the following setting conditions before starting adjustment.
• Allow warm-up of 20 minutes or longer. (Do not turn off during
warm-up.)
• Set all picture quality controls of users' setting to initial set-up,
unless otherwise specified.
• Picture quality reset
1.
Select "Picture" on the screen menu and press enter button.
2.
Select "Normal" and press enter button.
3.
Select "Reset" and press enter button.
• Set the pattern generator’s output level at 1.0Vp-p (across 75
Ω
load).
Because the video signal output from a pattern generator is used as
the adjustment signal input during adjustment, the video signal output
from the pattern generator must conform with the specifications.
Measure the output waveform across 75
Ω
load. Confirm that the
synchronizing signal has an amplitude of about 0.3 V, the video signal
portion has an amplitude of about 0.7 V and the burst signal has an
amplitude of about 0.3 V with flat envelope. Confirm that ratio of the
burst signal amplitude and the red signal amplitude is 0.30 : 0.66. If
the output signal does not conform with the specifications, calibrate
the pattern generator. (Refer to pattern generator operation manual.)
Use the LEADER: LCG 404 for the pattern generator.
Color
irregularity
Before adjustment
After adjustment
Fig. 1-1
Approx.
0.3V
Approx. 0.3V
Burst signal
1 Vp-p
White (Approx.
75%)
Approx. 0.7V
Y
ellow
Cyan
Green
Magenta
Red
Blue
Black
75% white
TV display
1. CRT ADJUSTMENT
1-1.
Precautions
(1) Receive the white raster signal, and then perform edging for
at least 20 minutes.
(2) Demagnetize the area surronding the CRT with a degausser
before making adjustments.
(3) Set the picture quality for each mode to the factory setting.
(4) Position the front screen facing to the east as much as possible.
1-2.
Purpose
(1) Beam landing adjustment (purity magnet)
Set the left/right balance of beam landing. If there is a
discrepancy in this adjustment, a color irregularity will occur.
After completion of the landing adjustment, it is necessary to
perform a convergence adjustment.
Summary of Contents for TV-CN202
Page 13: ...14 13 BLOCK DIAGRAM ...
Page 14: ...16 15 SCHEMATIC DIAGRAM 1 MAIN C B SECTION ...
Page 15: ...1 2 3 4 5 6 7 8 9 10 11 12 13 14 A B C D E F G H I J 18 17 WIRING 1 MAIN C B SECTION ...
Page 16: ...20 19 SCHEMATIC DIAGRAM 2 N K C B SECTION WIRING 2 N K C B SECTION 14 13 ...
Page 19: ...IC1 Pin 17 20 µs div 0 5 V div PlOx 0 5V A 20µs HOLDOFF MIN NORM SMSA 25 25 ...