Westinghouse VR-5585DFZ - Manual (Page 18)

Use Up and Down arrows to select channel scan source, then
press Enter.
Are you Using a Cable/Satellite Box to connect your TV?
Use the Left and Right arrows to select the input source of
your cable/satellite box. Use Down arrow to select Next,
then press Enter.
RF (TV Tuner input) is not recommended due to its poor
quality analog signal. Use Down arrow to select Back
and choose a higher quality input source. If you do not have
a high definition output, contact your cable/satellite provider
for additional information. Or, press Enter to proceed.
Use Up and Down arrows to make selection, then press Enter.