Klein 3000 Series Troubleshooting Manual page 49

SYSTEM 3000 OPERATIONS AND MAINTENANCE MANUAL
TPU Cooling
For proper unit cooling, any unused board slots should be closed with a blank panel.
The TPU has an air filter located on the right side of the front panel. This should be
checked at regular intervals. Once a month should be OK. If the filter is dirty, it can be
removed and washed in water or blown out with compressed air. To remove the filter,
pull out slightly on the tabs.
L-3 Klein Associates, Inc. TROUBLESHOOTING GUIDE 4-45