Appendix B: Maintenance
Model 2090 Multi-Device Controller
2. Disconnect all power and cables from the Model 2090
and move it to an open work area.
3. Use an anti-static wrist strap or other suitable ground to
insure that you are properly grounded while you work.
4. Use a #2 Phillips screwdriver to remove the six screws
(four on top, two along the back top edge) from the lid
of the Model 2090 case. Slide the lid to the back of the
Model 2090 to remove it.
5. Remove the three batteries and insure that the battery
holder and contacts are clean and dry. Refer to the
figure below to identify the location of various
components on the Model 2090 main board. A
“supercap” capacitor will normally maintain parameter
settings for several minutes while the batteries are
replaced.
6. Install three new 1.5V “AAA” alkaline batteries (type
EN92 or equivalent), taking care to observe the polarity
markings in the battery holder. Do not mix old and new
batteries, or types of batteries. Use only alkaline
batteries.
Failure to follow these directions may void
the warranty.
WARRANTY
7. Slide the lid on from the back of the Model 2090 and
replace the six mounting screws.
NOTE: The four mounting screws on the lid may be
different than the two on the back.
138
© ETS-Lindgren– April, 2006
Revision G– P# 399199
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