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CRT Set Up
Caution:
Insure yoke plugs on D-Board are reconnected
before turning the Receiver on to prevent damage to the hor-
izontal output transistor and/or CRTs.
izontal output transistor and/or CRTs.
1.
Connect signal generator to AV terminal and set for
Crosshatch pattern.
Crosshatch pattern.
2.
Loosen yoke clamp, seat yoke against bell of CRT and
rotate to correct yoke tile (compare to adjacent CRT)
tighten yoke clamp.
rotate to correct yoke tile (compare to adjacent CRT)
tighten yoke clamp.
3.
Remove adhesive from centering tabs and set centering
tabs for zero correction.
tabs for zero correction.
4.
Cover replacement CRT lens and static converge the
tubes not replaced if needed. Check size and linearity of
pattern and adjust as required.
tubes not replaced if needed. Check size and linearity of
pattern and adjust as required.
5.
Cancel the P-CONVERGENCE DATA by press the RE-
CALL [
] Button and [N] Button in Market mode
CHK4 for zero correction.
6.
Uncover replacement CRT lens and cover other two
CRT lenses. Adjust electrical focus on replacement CRT
and centering magnet. Adjust optical focus (lens) if
required.
CRT lenses. Adjust electrical focus on replacement CRT
and centering magnet. Adjust optical focus (lens) if
required.
7.
Goes out Market mode. (Do not store the Cancel data).
8.
Uncover all CRT lenses and use yoke centering magnet
to converge replacement CRT (in center area of screen
only) with other two CRTs. Disregard non-convergence
in areas other than center area.
to converge replacement CRT (in center area of screen
only) with other two CRTs. Disregard non-convergence
in areas other than center area.
9.
Adjust S and P convergence controls (see convergence
adjustment).
adjustment).
10. Perform White Balance procedure.
Dynamic Focus Adjustment and Confir-
mation
mation
1.
Focus adjustments should be performed after 1 hour of
aging.
aging.
2.
Use oscilloscope with 100 : 1 probe.
3.
Apply crosshatch pattern.
4.
Adjust the Red, Blue and Green focus VR on the focus
block for best focus of overall picture of each CRT. (Fig.
2)
block for best focus of overall picture of each CRT. (Fig.
2)
5.
Connect the scope probe to TP64, GND to D29.
Scope set at 20V/div & 5m sec./dev.
Scope set at 20V/div & 5m sec./dev.
6.
Confirm that waveform is 800V ± 60V. (Fig. 3)
7.
Proceed with Focus Adjustments.
Focus - Electrical Adjustment
1.
Cover the Red and Blue CRT, projecting Green only.
The electrical focus controls are located on the front.
Adjust the Green Focus VR for best focus of overall pic-
ture. (Fig. 2)
The electrical focus controls are located on the front.
Adjust the Green Focus VR for best focus of overall pic-
ture. (Fig. 2)
2.
Repeat for Red focus VR while projecting Red only.
3.
Repeat for Blue. (Best focus at bottom left corner of
screen)
screen)
Adhesive
Centering magnet
(Zero correction)
(Zero correction)
15±2mm
Fig.1
+
+
+
+
+
+
B
G
R
B
G
R
Screen adj. VR (3)
Focus adj. VR (3)
Focus Pack
Fig. 2
800±60V
Fig.3
0V
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