Service Manual

6802800U74-AN
Chapter 13: MTS Troubleshooting
380
Alarm ID
Descrip-
tion
quested lev-
el.
Recovery
Action
Clear Ac-
tion
Notes
also done each
time when the
target output
power is
changed by re-
covery or clear
actions of some
alarms.
• ALM_PA_NVM_CKSUM_F
AULT
• ALM_PA_NVM_CKSUM_F
AIL
• ALM_TX_DE-
KEYED_FWD_PWR_HIG
H
• ALM_PA_DE-
KEYED_POW-
ER_PRESENT
• ALM_RX_DC_INJ1_FAUL
T
• ALM_RX_DC_INJ1_FAIL
Checksum
fault for the
Power Am-
plifier NVM
parameters
was detect-
ed during
initialization
- some of
the Power
Amplifier
configura-
tion param-
eters may
be corrupt-
ed.
Reported if
Transmitter
is dekeyed
and the for-
ward power
meter still
measures
some out-
put power
that ex-
ceeds the
configured
acceptable
level.
Receiver
branch1
LNA DC in-
jection fail-
ure.
Software at-
tempts to set
the parame-
ters to the
default val-
ues taken
from the de-
fault region
in the NVM
memory.
BRC is de-
keyed again
by the soft-
ware.
Branch1 of
Receiver is
disabled by
the software
- if no more
enabled
branches
then BRC is
unable to re-
ceive, other-
wise BRC is
still able to
receive but
If the opera-
tion of re-
storing de-
faults is suc-
cessful the
alarm is
cleared. Oth-
erwise the
alarm status
is un-
changed.
If the alarm
condition
disappears
then
branch1 of
Receiver is
re-enabled
by the soft-
ware.
Corrupted con-
figuration pa-
rameters may
cause that BRC
works incorrect-
ly. The default
values may be
different than the
lost parameter
values. To en-
sure that the pa-
rameters can be
restored man-
ually to the earli-
er backed up
values.
The alarm may
be reported be-
cause of some
software error or
the BRC hard-
ware failure.
The alarm may
be reported be-
cause of the
BRC hardware
failure or config-
uration prob-
lems.