User manual

Section 4: Service Guidelines
TVC-500 Operation Manual 4-3
020-100539-01 Rev. 1 (08-2010)
4.3.3 Repair Cautions
DO NOT short transistors or ICs during circuit checks.
DO NOT operate with heat sinks removed.
DO NOT overload transistors or ICs. Make sure the controller is disconnected from AC
power before testing, removing, or installing modules.
DO NOT operate the controller with any internal part removed.
4.3.4 Maintenance Cleaning
Cautions
Never use solvents or flammable solutions to clean the workstation.
Never immerse any component in water or cleaning solutions; apply any liquids to a
clean cloth and then use the cloth on the component.
Always unplug the controller before cleaning the keyboard, mouse, or air vents.
Always disconnect the keyboard before cleaning it.
Wear safety glasses equipped with side shields when cleaning the keyboard.
Cleaning the workstation case
• Follow the safety precautions before cleaning the controller.
• To remove light stains or dirt, use plain water with a clean, lint-free cloth or swab.
• For stronger stains, use a mild dish washing liquid diluted with water. Rinse well by wiping it with a cloth or
swab dampened with clean water.
• For stubborn stains, use isopropyl (rubbing) alcohol. No rinsing is required because the alcohol evaporates
quickly and does not leave a residue.
• After cleaning, always wipe the workstation with a clean, lint-free cloth.
• Occasionally, clean the air vents on the workstation. Lint and other foreign matter can block the vents and
limit the airflow.
Cleaning the Keyboard
• Follow the safety precautions before cleaning the keyboard.
• Visible debris underneath or between the keys can be removed by vacuuming or shaking.
• Canned, pressurized air can be used to clean debris from under the keys. Use caution because too much air
pressure can dislodge lubricants applied under the wide keys.
• If you remove a key, use a specially designed key remover to prevent damage to the keys. This tool is avail-
able from many electronic supply outlets.