OPPO Digital Model PRO900X setup guide Yoke Tilt Alignment, Astigmatator Alignment Procedure

SYSTEM ALIGNMENT

III. PRELIMINARY ALIGNMENT SETUP

The following procedures are intended for complete “Geometry/Convergence” setup. Use the customer’s signal for doing phase, and size adjustments. You can use the internal pat- terns for shape and convergence if the customer signal sources do not have a cross-hatch pattern.

If you are realigning a single CRT, due to replacement, or doing alignment touch up, perform the following steps as needed.

1. Yoke Tilt Alignment

Use a cross-hair or cross-hatch pattern. Monitor only the center- most horizontal line of the pattern to check yoke tilt.

Do not use SW9501, on the 9-1510 module, to disable conver- gence. The vertical circuit is not disabled, only the horizontal is disabled.

a. Set Horizontal DC centering to “0” (red, green, blue). b. Set Vertical DC centering:

Floor: Red = -30; Green = -20; Blue = -30.

Ceiling : Red = 30; Green = 20; Blue = 30.

c. In geometry mode and convergence mode (green, red, and blue) set “SKEW” H = 0 and “SKEW” V = 0.

d. Adjust the Red, Green, and Blue yokes for no horizontal tilt or twist.

If this test shows a need for astimatator alignment perform steps “a” - “l” below.

Astigmatator Alignment Procedure

a. Set the display/sync mode to Forced Mode 6 (HDTV33) and select a cross-hatch or dot pattern.

b. Cut off Red and Blue video or cover the CRT lens assemblies.

c. Set Green electrical focus slightly CCW. This is to make a near display center dot dimly haloed with a bright center. The haloed effect will also be visible with the cross-hatch lines.

d. Use the astigmatator 4-pole magnet to shape the halo and bright spot as round as possible.

e. Use the astigmatator 6-pole magnet, if needed, to help shape the halo and spot round.

f. Use the astigmatator 2-pole magnet (refer to the figure at bottom left of this page) to center the bright spot within the halo. You may also use an intersection, of the cross-hatch, to center the bright area within the haloed area.

g. Use the main yoke magnets to position the signal raster center to the CRT face center. Refer to figure below.

2. Yoke Ring Magnet and Astigmatator Alignment

Verify Only - This is not a normal field adjustment.

The astigmatator assembly should be mounted 62.5 mm from the video output module (from the front edge of the video output module to the six pole rings). Refer to the figure on page 24.

Astigmatator Alignment Verification Test

Adjust for the best electrical and mechanical focus.

Verify spot alignment by rotating Green electrical focus slightly CW to CCW. The Dot shape should not tail or flair. The bright area should remain in the center of the haloed area. Refer to the fig- ure below.

h. Verify spot alignment by rotating Green electrical focus slightly CW to CCW. The Dot shape should not tail or flair. The bright area should remain in the center of the haloed area.

i. Repeat steps “c” thru “h” as needed to obtain the smallest and best round Green center dot with no shape flaring.

j. Adjust for the best electrical and mechanical focus. k. Repeat steps “c” - “j” for the Red and Blue displays. l. Exit forced mode 6 and return to normal video. Set

Brightness and Contrast to 50.

Note: The yoke adjustments should not be touched during the remaining setup steps.

3. Ceiling/Front Projection Lens Angle Focus Alignment

If this PRO900X system is equipped with the “lens assembly focus” spring, the following procedure must be completed. This procedure must be completed as part of the system mechanical

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