Labnet Spectrafuge 16M Microcentrifuge Service Manual - Manual (Page 11)

9
Section 4
2) From the bottom of the unit, remove the 2 PCB mount-
ing screws and nuts that secure the PCB brackets to
the baseplate (see figure #6, pg 16).
3) One at a time, remove each of the 3 plug in connectors
from the old PCB and install into the same location on
the new PCB.
4) Position the new PCB so that the 2 mounting bracket
holes are aligned with the two baseplate holes and
reinstall the 2 PCB mounting screws and nuts.
5) Replace the upper casing shell as previously described.
Tighten the 4 screws securely.
6) After reassembling the unit and reinstalling the rotor, the
speed must be calibrated according to the instructions
in the "Speed Calibration" section.
Speed must be recalibrated after replacing the PCB. Fail-
ure to do so may result in serious injury.
MISCELLANEOUS COMPONENTS
Timer & Momentary Switch If the unit will not rotate when the timer is turned on, press
the momentary switch. If the unit still does not rotate, the
problem is not attributable to the timer or momentary
switch. However, due to the fact that both switches are
used for identical internal switching, a quick diagnosis is
easy to perform. Any time that one of these two controls is
operational and the other is not, the latter control is either
the victim of a short circuit connection, or is defective and
should be replaced.
Lid Latch Mechanism The lid latch is disengaged by a DC solenoid and is essen-
tial to proper operation. For safety reasons, no attempt
should be made to modify, tamper with or defeat the latch
mechanism. To actuate the lid latch release, depress the
"lid" button on the front panel. The release can only be
actuated when the lid is completely closed and latched and
the rotor is not turning. The technician should be aware of
the interaction between these components at all times
during the troubleshooting process.
In the event that the lid latch mechanism will not energize,
power to the solenoid should be verified. To access the
entire latch assembly, remove the upper casing shell as
previously described.
CAUTION