To check your receiver to the following (you probably know most of this, but may have missed something) - Manual page #s are based on this version of the manual
http://www.kenwoodusa.com/UserFiles...ons/AMA/Manuals/TM-V708A (K)-English O-M.pdf:
1. Make sure that the Mute function is not active (page 69 of the manual).
2. Turn off all tone, CTCSS, and DCS functions (pages 28, 53, & 55 of the manual). You want no tones defined since all they do is restrict what is received and you want to hear anything and everything during this test.
3. Rotate the squelch so you hear static on your receiver (page 20 of the manual). This should be the larger of the two controlls for each band.
4. Select the correct band where a known signal is transmitting (use a scanner or other receiver to find one - as indicated above the NOAA Weather frequencies are generally good for this).
5. Enter the known active frequency to verify proper receiver operation (hopefully things will work as expected at this point) (page 20 of the manual). If the frequency doesn't transmit continuously (e.g. a local repeater vs the NOAA Weather station) monitor with another radio and check when a transmission is active.
6. Repeat for the other band(s) as necessary (NOAA Weather will work for VHF-Hi, but another signal source will be required for UHF).