Set-Up For Adjustment; Crt Adjustment - Aiwa TV-AN2110 NH Service Manual

SET-UP FOR ADJUSTMENT

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.
Approx. 0.7V
1 Vp-p White (Approx.
75%)
Approx. 0.3V
TV display
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 to 1.0Vp-p (across 75Ω
load).

1. CRT ADJUSTMENT

1-1. Precautions
(1) Receive the white raster signal, and then perform aging 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 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 convergence adjustment.
Before adjustment
Burst signal
Approx.
0.3V
(2) Beam convergence adjustment (4-pole magnet)
Align the R beam with the B beam. The G beam does not
move with this adjustment.
R
(3) Beam convergence adjustment (6-pole magnet)
With a 4-pole magnet align the G beam with the already aligned
R/B beam.
(magenta)
Align the G beam with the R/B beam
28
After adjustment
Color
irregularity
Fig. 1-1
(magenta)
B
R/B
G
Align the R beam with the B beam
Fig. 1-2
(white)
R/B
G
RGB
Fig. 1-3
G