The following adjustments should be made when a complete realignment is required or a new picture tube is installed. These adjustments should be performed with rated power supply voltage unless otherwise noted. The controls and switch should be set as follows unless otherwise noted: VIDEO MODE: STANDARD (RESET)
Perform the adjustments in order as follows: 1. Beam Landing 2. Convergence 3. Focus 4. Screen (G2) 5. White Balance Test Equipment Required: 1. Color Bar Pattern Generator 2. Degausser 3. DC Power Supply 4. Digital Multimeter
2-1. BEAM LANDING
Preparation: � Input a white pattern signal. � Face the picture tube in an East or West direction to reduce the in�uence of geomagnetism. NOTE: Do not use the hand degausser; it magnetizes the CRT . 1. Input white pattern from pattern generator. Set the PICTURE control to maximum, and the BRIGTNESS control to standard. 2. Perform Focus, G2 and White Balance adjustments. 3. Loosen the de�ection yoke mounting screw, and set the purity control to the center as shown below:
Purity Control
6. Move the de�ection yoke forward, and adjust so that the entire screen becomes green.
7. Switch over the raster signal to red and blue and con�rm the condition. 8. When the position of the de�ection yoke is determined, tighten it with the de�ection yoke mounting screw. 9. If landing at the corner is not right, adjust it by using the disk magnets.
Purity control corrects this area Disk magnets or rotatable disk magnets correct thses areas (a-d)
4. Input a green pattern from the pattern generator. 5. Move the de�ection yoke backwards, and adjust with the purity control so that green is in the center and red and blue are even on both sides.
d b
