1-10
PREVENTIVE
MAINTENANCE
The 690XXB/691XXB must always receive adequate ventilation. A
blocked fan filter can cause the instrument to overheat and shut down.
Check and clean the rear panel fan honeycomb filter periodically.
Clean the fan honeycomb filter more frequently in dusty environ-
ments. Clean the filter as follows.
Step 1
Remove the filter guard from the rear panel by pull-
ing out on the four panel fasteners holding them in
place (Figure 1-3).
Step 2
Vacuum the honeycomb filter to clean it.
Step 3
Install the filter guard back on the rear panel.
Step 4
Press in on the panel fasteners to secure the filter
guard to the rear panel.
1-10
690XXB/691XXB MM
GENERAL
PREVENTIVE
INFORMATION
MAINTENANCE
Figure 1-3.
Removing/Replacing the Fan Filter Guard
Summary of Contents for 680 C Series
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