Olympus BHTU Manual de instrucciones - Página 15

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1. Troubleshooting Guide

Focus Adjustment

Fig. 18

Adjustment Knobs and

Although the tension of the coarse adjust-

ment knobs has been already adjusted for

optimum performance by the manufacturer.

it is possible to personally adjust the tension

of the coarse adjustment for either heavy or

light movement depending on the operator's

preference by rotating the tension adjust-

ment ring

<D.

(Fig. 181

The ring can be rotated by inserting a screwdriver into one of the holes on the periphery of the

ring. The clockwise rotation (in the direction of the ARROW) tightens the coarse adjustment

knobs. Do not loosen the ring too much, because the stage may drop or the fine adjustment

knobs may slip.

1. Tension of Coarse

Fine Adjustment.

NOTE: Do not rotate the right and left coarse adjustment knobs in the opposite directions

simultaneously. If the stage drops and the specimen goes out of focus. the tension

adjustment ring is too loose. Tighten the ring.

Use of Rubber Cap for Fine Adjustment Knob,

Attaching this cap over the fine adjustment

knob increases the sensitivity of the fine focus-

ing motion.

(The rubber cap is optionally

available.)

2. Pre-Focusing Lever

This lever

ill

is provided to prevent possible

contact between specimen and objective as

well as to simplify coarse focusing. (Fig. 191

The lever is locked after coarse focus has

been accomplished. This prevents further

upward travel of the stage by means of the

coarse adjustment knobs, and automatically

provides a limiting stop if the stage is lowered

and then raised again. The pre-focusing lever

does not restrict fine focusing.

Fig. 19