User's Manual

Screen Service SDT 200UB – SDT 500UB ARK-1 ATSC Operations
July, 2009 v 1.0 Page 3 - 97
Signal 10 MHz Lock
• GPS communication error alarm is not signaled
• GPS lock alarm is not signaled
• 10 MHz is not locked.
I/A
• If the Network’s Transmitters Synchronization is SFN, check the
frequency reference: it should be other than internal
• If the frequency reference is Internal: internal PLL fault
• If the frequency reference is External:
o Internal PLL fault
o Lack of external 10 MHz
o Hardware fault
• If the frequency reference is GPS:
o Check GPS alarms
o Internal PLL fault
o Hardware fault
X (0)