For ease of control, the rotation tension of the
coarse focus adjustment knob is adjustable.
1. While holding the coarse focus adjustment knob ,
rotate the coarse focus adjustment knob tension
adjustment ring ‚. Rotating the adjustment ring in
the direction of the arrow increases the tension of
rotation, and rotating the ring in the opposite direc-
tion decreases the tension.
2. If the stage lowers itself due to its weight or focussing
position obtained with the fine focus adjustment
knob is lost easily, the tension of the coarse focus
adjustment knob may be too loose. Increase the
tension by rotating the adjustment ring ‚ in the direc-
tion of the arrow. (Fig. 23)
Fig. 23
2
1
2
The pre-focusing knob controls the mechanism for
preventing collision between the specimen and objective.
1. After bringing the specimen into focus, turn the pre-
focusing knob (as shown in fig.) inside the hole of the
arm and feel the hit of the pre-focusing mechanism on
the stage guide.
2. To provide a certain margin for focusing, rotate the
knob by about half turn backward from the stopped
position.
3. If the function of this mechanism is not required, set the
pre-focusing knob at the highest position.
Pre-focusing Knob:
1
1
Fig. 24
