Focus Friction - Scan Optics SO-5000 User Manual

SO-5000 Ophthalmic Microscope

FOCUS FRICTION

The SO-5000 microscope system relies on a friction device to allow the microscope head to stay in
position when it is not being focussed, yet still allow the head to be focussed manually or by the motor
drive. Over time or with extended use, the friction may decrease resulting in some slippage of the
microscope head focussing system. This is easily remedied by resetting the focus friction.
Firstly, focus the microscope all the way down to avoid the possibility of accidental slipping.
Remove the focus drive cover by removing the four screws. Identify the locations of the two holes
drilled transversely, 180 degrees apart through the manual focus knob on the other side. Insert a 2mm
socket key to loosen the grubscrews in each hole.
While gripping the large white gear steady in the focus drive housing (to ensure the gears do not strip),
tighten the knob to increase friction, or loosen it to decrease friction as necessary. When the
appropriate setting has been found, tighten the grubscrews again and replace the focus drive cover.
Note that there may be a small level of experimentation required to achieve the best friction setting. If
the motor drive becomes too slow, there is probably too much friction although first check that the
motor speed adjustment on the main panel is not set excessively low. If the focus system tends to slip,
especially at the top of the range, the amount of friction needs to be increased. In most cases a slight
increase in friction works best when the focus system is showing signs of slipping.
FOCUS DRIVE COVER
GRIP LARGE DRIVE GEAR
ISSUE NUMBER:
DATE: 11/04/02
Figure 13
5.0 SUPERSEDES:
DATE: 22/05/01
User Manual
TIGHTEN OR
LOOSEN KNOB
AS NECESSARY
Adjusting focus friction
4.0 WRITTEN BY:
DATE: 22/08/97
Page 23 of 36
LOOSEN 2 x GRUB SCREWS
RE-TIGHTEN AFTER KNOB ADJUSTED
RJK CHECKED BY:
DATE: 22/08/97
NW