Leica Biosystems ST4020 - Manual (Page 28)

28 Instructions for Use V1.1, RevB – 10/2012
5. Operation
Display Contrast
The contrast on the liquid crystal display can be adjusted
according to the preferences of individual users.
• The adjustment range is between 1 and 15, 1 being the bright-
est setting.
• Pressing the PLUS or MINUS key changes the number of
contrast for the display.
• After ENTER is pressed, the setted contrast is stored.
Transfer Mechanism Calibration
The position at which the transfer movement is paused and
processing started may be adjusted by pressing the PLUS (+) or
MINUS (-) keys, followed by the ENTER key.
• Pressing the PLUS or MINUS key changes the number of
steps carried out by the stepping motor by 8. The minimum
permitted value is 704, the maximum permitted value is 1000.
The typical setting is 944 to 960.
• After ENTER is pressed, the number of steps is stored. Also,
the transfer mechanism advances to the next station, stop-
ping when the selected number of steps has been taken.
Number of Dips
The number of dips that are carried out for uniform staining can
be set in a range from 0 to 3.
• Pressing the PLUS or MINUS key changes the number of dips
carried out by the instrument.
• After ENTER is pressed, the number of dips is stored.
If a value of 1, 2 or 3 has been selected, the system dips the slide
carriers the corresponding number of times as soon as they
reach a station.
All subsequent dip motions are carried out at intervals of 20 sec-
onds each if the processing time is 30 seconds or more. If the
processing time is less than 30 seconds, then no dips will occur,
regardless of the setting selected.