Main Chassis - Ikegami HTM-1517R Service Manual

A. MAIN CHASSIS
(1) PURITY adjustment
The purity is adjusted to optimum at shipment.
Normally, no adjustments are required.
However perform adjustments if necessary.
Purity Magnets
Deflection yoke
1. Select the flat field using the TEST switch.
2. Demagnetize the shadow mask using the
DEGAUSS switch.
3. Set the screen to the green-only raster using the
SCREENS switch.
4. Adjust the two purity magnets alternately, so that
there are green vertical lines at the center of the
screen.
5. While watching the screen, slide the deflection
yoke forward so that the screen is an even green
color.
6. Repeat for red-only and blue-only.
7. Adjust the purity to optimum using ROTATION.
4-polar Static
Convergence Magnets (R/B)
6-polar Static
Convergence Magnets (R/G)
Lock Ring
(2) CONVERGENCE adjustment
Before performing convergence adjustment, allow
the monitor to warm up for at least 30 minutes.
Select the cross hatch using the TEST switch.
1. Loosen the lock ring.
2. Set to the red and blue screens using the SCREENS
switch.
3. Observe the crossed part at the center of the screen.
Adjust the angle of the two 4-polar magnets as
shown in the figure below to adjust deviation of
the red and blue vertical lines.
4. While keeping the angle at step 3, rotate the two
magnets together and adjust the deviation of the
horizontal lines.
Fixed
Angle
5. Set all SCREEN switches to OFF to set the while
screen.
6. Adjust the angle of the two 6-polar magnets to
adjust the deviation of the red and blue vertical
lines, and green vertical lines.
Red
Blue
Blue
Red
Red/Blue
Green
1-A-1