Hitachi TM3000 Instruction Manual page 230

Figure 5.2-7 Beam Axis Adjustment STEP 1, an Example
4a. First, loosen the four axis adjustment knobs, A, B, C and D, by approximately one turn.
Figure 5.2-8 Operating the Electron Gun Axis Adjustment Knobs (1)
Figure 5.2-9 Operating the Electron Gun Axis Adjustment Knobs (2)
4b. In the next step, turn one of the knobs (for example, Screw A in Figure 5.2-8) in a
fastening direction. When it becomes tight, loosen the knob in the opposite direction (in
Figure 5.2-8, Screw C), and then turn Screw A further in the tightening direction. During this
operation, turn the knob while paying attention to the image. When an image appears, adjust
the knobs in the direction of a brightening image.
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