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Section 5 - System Operation Manual
(E-Compact ATSC Transmitters - EC701HP thru EC708HP)
Exciter Alarms:
The table below profiles all possible alarms generated on the Digital Exciter and the associated
troubleshooting actions to take.
Digital Alarms Exciter:
ALARM MESSAGE
Sync loss TS 1!
Sync loss TS 2!
LO Lock Fail!
Clock Lock Fail!
Fifo Overflow!
+15V, +3.3V, +2 8V,
+5V
FPGA Comm. Fail!
FIFO Underflow!
Clock / CXO Fail!
Remote Mute!
Manual Rev. 0.0 - August 2016
ALARM DESCRIPTION
Lack of sync with the input
transport stream.
Lack of sync with the
input transport stream.
Lack of LOCK
(UP Converter)
Lack of LOCK
(Clock modulator)
FIFO Overflow
(modulator)
PS failure; +15V, +3.3V,
28V or +5V
No communication with
the FPGA.
Self-explanatory
Self-explanatory
The transmitter output
power was reduced to 0W
via remote action.
ACTION THAT FOLLOWS
Check for the presence of TS 1 on the
rear BNC connector of the Exciter.
Further action if necessary check inside
the exciter for malfunction.
Check for the presence of TS 2 on the
rear BNC connector of the Exciter.
Further action if necessary check inside
the exciter for malfunction.
Check for mal-function on the UP
Converter.
Substitute the module.
Check for eventual cabling bad contact.
Full analysis of the circuitry will be
necessary.
Get in contact with Hitachi Kokusai
Full analysis of the circuitry will be
necessary.
Get in contact with Hitachi Kokusai
Linear's technical support service.
Follow the basic procedure with
voltmeter looking for some clear evidence
of malfunction. Replace the module if
necessary.
Full analysis of the circuitry will be
necessary.
Get in contact with Hitachi Kokusai
Linear's technical support service.
No local action.
No local action.
No local action.
5-44
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