If there is no backlight output, there are 2 options for the end-user to choose from:
- Check T1 for damage. If physically damaged or T1 is making a squealing sound, it needs to be replaced by a certified ETC technician.
- Check the RFU configuration to see if the backlight timer is on. The default setting for the timer is: 05 Min., 00 Sec. To check the configuration, press and hold the top 3 buttons on the numbered portion of the RFU keypad upon boot up ("7, 8, 9" on the EXPN RFU2; "+, Thru, -" on the OBSN RFU2) . Cycle through each option with the "+" key and enter the desired time when the backlight option is reached. Press "Enter" when finished.