LAI-2050 Log Switch Assembly
Replacement Instructions for the LAI-2000 Plant Canopy Analyzer
1
4
Loosen the 4 hex
head screws; you
will need to pivot
the optical sensor
head to access all
of the screws.
The following document describes the procedure for
replacing the log switch assembly on the LAI-2000
optical sensor head (p/n 2000-906). Please note that
the replacement kit does not include some required
adhesives; you can search for local suppliers and/or
order adhesives at the web addresses shown below.
Note, too, that the optical sensor head is a static-
sensitive device, and precautions (e.g. a static wrist
strap) should be taken before beginning this proce-
dure.
Tools Required:
3/32” hex wrench
1/4” open end wrench
Needle nose and lock-joint pliers
Flat blade screwdriver
Adhesives, including Loctite 242 Threadlocker and
Loctite PRISM 401 (www.loctite.com), and Dow
Corning 732 Multi-purpose sealant
(www.dowcorning.com)
Time Required:
Approximately 30 minutes
●
Follow these steps to replace the log switch as-
sembly:
1.
Use the 3/32” hex wrench to loosen the 4 hex
head screws at the connection between the
handle and the optical sensor (Figure 1). You will
need to pivot the sensor head to access the
screws.
2.
Use a pair of needle nose pliers to gently pull out
the detector connector from the circuit board
(Figure 2).
3.
Use the 3/32” hex wrench to remove the 4 hex
head screws at the opposite end of the handle,
where it attaches to the cable assembly (Figure 3).
Slide the circuit board out until you can unplug
the cable assembly by pulling the connector
straight out from the circuit board. Continue to
slide the circuit board out until you can access the
4-pin (white) log button/grounding connector
(Figure 4). Unplug the 4-pin connector, and slide
the circuit board back into the handle.
3
Remove the 4 hex
head screws at
the handle/cable
assembly.
2
Unplug the
detector connector
by pulling straight
out.
Slide the circuit
board out until you
can unplug the
white 4-pin
connector, and
then slide the
board back into the
handle.
