1.ADJUST YOKE Z-AXIS FIRST2 .ADJUST BEAM BENDER 2 POLE
TO GET EQUAL BLUEMAGNET TO GET FOUR EQUAL
COLOR CIRCLESCOLOR CIRCLES
MAGNETS
REDRED
8. Referring to above, perform the following two steps:6. Reconnect the internal degaussing coil and apply AC power.
a. Adjust the yoke Z-axis to obtain equal blue circles.
b. Adjust the appropriate beam bender tabs to obtain correct7. Turn the receiver on for 10 seconds to perform internal
purity (four equal circles).degaussing and then turn the receiver off again.
9. After correct purity is set, tighten the yoke clamp screw and8. Unplug the internal degaussing-coil.
remove the two screen magnets.
9. Turn on the receiver, connect a signal generator to the VHF
10.Remove the AC power and rotate the receiver 180 degreesantenna terminal and apply a crosshatch signal.
(facing "magnetic south").
Caution:During the convergence adjustment procedure, be
11. Reconnect the internal degaussing coil.very careful not to disturb the purity adjustment tabs
are accidentally move, purity should be confirmed
12. Turn the receiver on for 10 seconds (make sure the receiverbefore proceeding with the convergence adjustments.
came on) to perform internal degaussing, and then turn the
receiver off.Note:Make sure the focus is set correctly on this instrument
before proceeding with the following adjustment.
13. Unplug the internal degaussing coil.
10. Converge the red and blue vertical lines to the green vertical
14. Turn on the receiver and check the purity by holding one (1)line at the center of the screen by performing the following
round magnet at the 3 o'clock and a second round magnet atsteps (below TABLE).
9 o'clock position. If purity is not satisfactory, repeat steps 8a. Carefully rotate both tabs of the 4-pole ring magnet
through 14.simultaneously in opposite directions from the 12 o'clock
position to converge the red and blue vertical lines.
15. Turn off the receiver and reconnect the internal degaussingb. Carefully rotate both tabs of the 6-pole ring magnet
coil.simultaneously in opposite directions form the 12 o'clock
position to converge the red and blue (now purple)
vertical lines with the green vertical line.
! Convergence Adjustment
11. Converge the red and blue horizontal with the green line at
Caution:This procedure DOES NOT apply to bonded yoke andthe center of the screen by performing the following steps.
picture tube assemblies.(below TABLE)
Do not use screen magnets during this adjustmenta. Carefully rotate both tabs of the 4-pole ring magnet
procedure. Use of screen magnets will cause ansimultaneously in the same direction (keep the spacing
incorrect display.between the two tabs the same) to converge the red and
blue horizontal lines.
1. Remove AC power and disconnect the internal degaussingb. Carefully rotate both tabs of the 6-pole ring magnet
coil.simultaneously in same direction (keep the spacing
between the two tabs the same) to converge the red and
2. Apply AC Power and set the brightness to the Picture Resetblue (now purple) horizontal lines with the green
condition. Set the Color control to minimum.horizontal line.
c. Secure the tabs previsouly adjusted by locking them in
3. Make a horizontal line.place with the locking tabs on the beam bender.
4. Adjust the Red, Green and Blue Bias controls to get a dim
white line.
5. Restore the screen by removing the horizontal line.
- 15 - |
ACEC
