Leica OH4, Service Manual, Page: 184 / 264

Use
42 Leica M525 OH4 / Ref. 10 714 367 / Version -
Setting the illumination field diameter
Caution 7
Heating of tissue!
If the illumination field diameter is larger than the
visual field and the light intensity is set too high, uncon-
trolled heating of tissue can occur outside the visible
range of the microscope.
➩
Do not set the light intensity too high.
The light field diameter is automatically adapted to the size of
the visual field at the Leica M525 optical carrier. The
illumination field diameter can also be adjusted manually with
rotary button (2). Automatic adjustment can be deactivated with
the rotary button and reactivated with the Reset button (1).
If the illumination field diameter is blocked at a high
light intensity in a high zoom setting, and cannot be
adjusted automatically or manually, then the light
intensity must be reduced in order to protect the tissue.
If the illumination field diameter remains blocked in a
low zoom setting, and cannot be adjusted
automatically or manually, then an OP lamp can be
used for better illumination of a large visual field (low
zoom setting).
2
1
Adjusting the magnification (zoom)
You can set the magnification with a footswitch/handswitch or
with the "Magnification" adjustment bar in the "Main" menu of
the control unit.
Clicking the "+" or "-" key changes the magnification
value in increments of one. Holding down the mouse
button with your finger changes the value in
increments of five.
You can adjust the zoom motor speed in the "Speed"
menu.
These values can be saved individually for each user
(see page 46).
Warning 8
Danger to the patient due to failure of the zoom motor!
➩
In case of failure of the zoom motor, the zoom can be
adjusted manually.
Manually adjusting the magnification (zoom)
Caution 8
Destruction of the zoom motor!
➩
Use the manual adjustment of the zoom motor only if
the zoom motor is defective.
In case of failure of the zoom motor, the zoom can be adjusted
manually using rotary button (3).
➩
Hold down rotary button (3).
➩
Set the desired magnification by turning the knob.
3