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That's a pretty vague question: The focusing mechanism on most binocs is a spiral shaft with a follower - essentially a "jack screw". The threads may be stripped, or the follower may have slipped off the shaft. You can probably remove the end caps from the shaft and disassemble it to resolve. Be careful not to contaminate the lubricated sliding parts with dust/dirt while doing so...
It was proved by sage engineers that lubrication is very much important for each and every single component of a mechanical machine. In order to keep the machines running for long time use trabon lubrication. More Info at : Home FDJohnson
The drawer loading mechanisms are generally not hard to repair, just somewhat delicate. The slot-loading mechanisms are really delicate and fussy. Some drawer mechanisms use a belt drive and the belt sometimes goes bad.
Gear mechanisms usually have a clutch that slips if the mechanism is overloaded. If that is happening, clean out any foreign material (dirt, sawdust, etc.) from the gears and lubricate the gears with a very thin white or silicone grease or if the gears had no grease, use paste wax. Apply lubricant sparingly. You can turn the drawer motor shaft by hand to observe what is happening.
Sometimes the mechanism will jam if the CD gets mis-located on the tray. This is more common on multi-disc units - if the unit is tilted with discs inside, they slide out of their spots and get into all kinds of mischief.
General precautions: do all of your work with the device unplugged. Do not touch the electronics, especially not the optical components. They are vulnerable to static electricity damage, and the optical head focus mechanism is very delicate. And no, you can't protect it with a plastic sheet; the plastic itself will zap the electronics. Just be careful not to touch the optics, period. It usually is not that hard to work around.
I just bought a pair of this model and had the same problem. l muscled the focus knob repeatedly right to left and back until it finally began to move ever so slightly but progressively until it rotated freely from stop left to stop right. Very good optics and ficus range complimented by adjustable diopter. Had it not given in to my stubborn strong thumb finger grip efforts, I would have resorted to a solvent lubricant. Glad it wasn't necessary. Mike-Florida
They would need to be sent to Swarovski in Absam, Austria for repair.
Swarovski have a lifetime guarantee on all of their binoculars, it's a matter of you getting it to them to effect the repair. www.swarovskioptik.com.at
The number one rule is to never use oil on a binocular!!
I suspect that the multistart thread on the focus arm carrier, which is internal, has become gunged up. This is not an easy repair for a beginner. The rubber has to be removed from the body of the binocular before you can even start to take them apart to determine the fault.
Like any bearing or gear system, the part would have to be cleaned with a degreaser, then reassembled with new lubricant.
I would be inclined to use a penatrative aerosol lubricant (like WD-40) in very sparse quantities. Squirt a little in using the WD40 smart straw applicator to direct the lube accurately and work the adjuster back and forth in a small section. Repeat this until you have freed up the adjustment from one end of its scope to the other. The focal adjustment is typically housed separately to the lenses and careful application of the lube should not affect them - avoid overusing the lube and have a mopup cloth under the spray zone to keep overspray/drips to an absolute minimum.
All binoculars (except some really cheap rubbish) have a different focus for each eye. There are two types. Binoculars that have two individual eyepieces that turn and no center focus wheel. This is common to military, astronomy and binoculars used at sea.
The other is the usual center focus binoculars that have a wheel between the two barrels. They will also allow either the left or right eyepiece to turn to focus for one eye. The reason is that manufacturers take into account that each eye is slightly different.
like me and you with age we all get stiff...sounds like it has been used alot and needs regreasing. the focus wheel on the zeiss is a double washer type and that it why it is stiff, sometimes the washer between the two focus knobs gets broken....but im sure thats not it...just needs a little tlc ..if i can help any further give me a call @15082549726....surprised zeissman didnt answer thi