Go into the edit on the TSYS.
Scroll down to the T Tables (easier to use FUNC down arrow then scroll up one).
Select the T Tables
Select Table 1 (usually all you will need)
Enter the Lo chan
Enter the hi chan
Enter the offset
Enter the base
Enter the step.
For the 500 (and I assume the 600) you will need the first two values. They are typically NOT found in the data base. The Lo chan is the offset (usually 380) and the Hi chan is usually 759.
Save the setup, press scan and you should be able to hear something eventually (if the system is active).
You can check for some activity by pressing manual, then the "TSYS" then "ANALYZ". Scroll until you find the active control channel and see if it is providing any system information.