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Chapter 4 Maintenance
COMPRESSOR
Compressor maintenance procedures are described in Appendix B.
FAN FILTER
The fan filter is located on the outside of the rear panel. When the filter shows sings of
dust buildup, snap off the protective cover. Remove the filter and wash in cold water.
Ring it out, replace it in the protective cover, and snap the cover in place.
FUSE REPLACEMENT
Two 5x20mm 250V SLO-BLO fuses are located in a drawer above the power cord
socket. The current rating of the individual fuses depends on the "mains" supply voltage
that your Model 1160 has been configured. Refer to the instrument data label located on
the rear panel near the input power module for the fuse ratings for your Model 1160.
SERVICE ALARM BATTERY
The backup battery, shown in Figure 3-2, provides an alternative power source to the
service alarm timer, and prevents a reset from occurring when the AC power is cycled.
In normal operation, the battery should last between two and three years. To remove the
battery, gently lift the retaining clip outward until the battery can be removed from its
holder. Replace with a new battery. Be sure to note the battery polarity when installing
the new battery. The positive "+" plate of the battery should be facing the installer during
installation. The battery backup circuit is diode protected. In the event that the battery is
installed improperly, (reversed polarity) the diodes prevent a short circuit current flow
from the battery. However, the backup voltage will not be applied to the service alarm
circuit resulting in loss of service alarm timing functions.
4-4
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