Leica OH4, Service Manual, Page: 22 / 264

Technical Description Service manual Leica OH4
9/2006 3243 - GOR 1-8 Doc. Code 10 665 744
Principal description
Stand system
The stand system is based on the OH3. Improvements and new developments in mechanics and electronics leaded to a better
functionality and an easier handling of the stand.
Mechanical damper
Different axes are equipped with damper parts. While the brakes are closed, the damper reduces vibrations to a minimum.
Electro magnetically brakes
The stand is blocked by 6 magnetically brakes. Pressing the rear handgrip knobs (all free button) releases all 6 brakes. The side
handgrip knob allows releasing 3 brakes only: brakes 4, 5 and 6 or brakes 1, 2 and 3. The selection switch determines which
brakes: in position “XYZ-free” the brakes 1, 2, 3 will release. In position “focus lock” the brakes 4, 5, 6 will release.
A mouth switch can also release the brakes 1, 2, 3.
Automatic balancing system
Install the accessories in the permitted weight range. Align the accessories in the working position. Press the “All Brakes” button
on the CAN handle and move the optics carrier into the A-position. The mark must be pointing to A. Press the autobalancing push-
button on the control unit. During the balancing procedure, the push-button flashes green and an acoustic signal sounds (can be
deactivated in the service menu). The first balancing step is complete when the acoustic signal no longer sounds and the push-
button is no longer flashing.
Press the “All Brakes” button on the CAN handle, tilt the optics carrier forwards 90° and move it into the B-position. The mark
must be pointing towards B. Press the autobalancing push-button on the control unit again. During the balancing procedure, the
push-button flashes green and an acoustic signal sounds. Balancing is complete when the acoustic signal no longer sounds and
the push-button is no longer flashing. A dialog window indicates that balancing has been completed.
Intraoperative balancing
Intraoperative AC/BC balancing allows re-balancing during the operation. Re-balancing may be necessary if, for instance, an
assistant`s tube is adjusted. Either axes A and C or B and C can be balanced.
A/C balancing
If work is performed only in the horizontal microscope position, re-balancing of the A/C axes may be sufficient. Press the “All
Brakes” button on the CAN handle and move the optics carrier into the A-position. Press the start button for automatic AC/BC
balancing on the swing arm. During the balancing procedure, the push-button on the control unit flashes green and an acoustic
signal sounds. The A-axis is balanced first, followed by the C-axis.
B/C balancing
If work is performed only in the upright microscope position, re-balancing of the B/C axes may be sufficient. Press the “All
Brakes” button on the CAN handle and move the optics carrier into the B-position. Press the start button for automatic AC/BC
balancing on the swing arm. During the balancing procedure, the push-button on the control unit flashes green and an acoustic
signal sounds. The B-axis is balanced first, followed by the C-axis.