Using the LI-8150 Multiplexer
10-115
LI-8150 Maintenance and Repair
The LI-8150 Multiplexer is designed to require little or no routine maintenance.
Most of the LI-8150 components are modular, and are designed to be easily
replaced should the need arise. The discussion below describes basic maintenance
and repair of user-replaceable items; contact LI-COR for information on repair of
items not described below.
Fuses
There are two fuses on the LI-8150 main circuit board that protect the LI-8100A
and LI-8150 power supplies. Spare fuses can be found in the LI-8150 spares kit.
The fuses are located under the access panel at the front edge of the white lower
plate assembly, as shown in Figure 10-19 below. The proper fuse sizes are labeled
on the circuit board; the leftmost fuse protects the LI-8100A power supply (3A Fast
250V 5x20, p/n 439-04215), and the rightmost fuse protects the LI-8150 power
supply (4A Fast 125V 5x20, p/n 439-08516). If the LI-8150 and/or LI-8100A fail to
power up, check to see if either of these fuses has blown. Loosen the thumbnuts
on the access panel and lift off to access the fuses. You may need to unplug the
two connectors above the fuses to access the fuses.
LI-8100 fuse:
3A Fast 250V 5x20. p/n 439-04215
LI-8150 fuse:
4A Fast 125V 5x20. p/n 439-08516
Figure 10-19. Remove the access panel to replace the fuse(s).
Tubing
The urethane tubing used for air connections within the LI-8150 is 1/8” ID x ”
OD; a 3’ length of this tubing can be found in the spare parts kit under p/n 222-
00303. If any of the internal tubing should become clogged or otherwise damaged,
simply remove it by pressing in on the orange quick-connect fittings, cut a new
piece of the same length, and replace.
Air Filters
The air filters are located on the air lines connected to each of the eight (or sixteen)
air input ports. The filters are translucent to more easily see dust and dirt buildup.
Check the filters periodically (yearly or more often, depending on operating
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