Service Manual

372
6802800U74-AN
Chapter 13: MTS Troubleshooting
Alarm ID
Descrip-
tion
Recovery
Action
Clear Ac-
tion
Notes
uration prob-
lems.
ALM_BRC_VCXO_UN-
LOCK_ALM
ALM_BRC_RE-
PLACE_VCXO_ALM
• ALM_RX_ABA-
CUS_CLK_SL
• ALM_RX_ABA-
CUS_CLK_SL_FAIL
VCXO is
unlocked -
the alarm is
reported as
a fault indi-
cation mes-
sage from
DSP.
VCXO
should be
replaced -
the alarm is
reported as
a fault indi-
cation mes-
sage from
DSP.
Receiver
main Aba-
cus clock
failure.
No recovery
action taken
by the soft-
ware.
No recovery
action taken
by the soft-
ware.
Receiver is
disabled by
the software
- BRC is un-
able to re-
ceive.
The alarm is
cleared after
de-keying
BRC.
The alarm is
cleared after
de-keying
BRC.
If the alarm
condition
disappears
then Receiv-
er is re-ena-
bled by the
software.
The alarm
means that the
BRC reference
is not locked to
an external ref-
erence and
VCXO frequency
tolerance can
vary between
0.025 and
1.5ppm. The
alarm may be
reported be-
cause of the ex-
ternal reference
failure or BRC
hardware failure.
This is an indica-
tion the refer-
ence clock may
go out of lock in
the future.
The alarm may
be reported be-
cause of the
BRC hardware
failure or config-
uration prob-
lems.
ALM_RX_ABACUS_LO2_SL Receiver
main Aba-
cus 2nd LO
failure.
Receiver is
disabled by
the software
- BRC is un-
able to re-
ceive.
If the alarm
condition
disappears
then Receiv-
er is re-ena-
bled by the
software.
The alarm may
be reported be-
cause of the
BRC hardware
failure or config-
uration prob-
lems.
ALM_RX_ABA-
CUS_2LO_SL_FAIL
Reported when ALM_RX_ABACUS_LO2_SL is set and
ALM_RX_5_VOLT is cleared
• ALM_BRC_ABA-
CUS_CLK1_ALM
• ALM_BRC_ABA-
CUS_CLK1_FAIL
Abacus
clock 1 is
not present
- the alarm
is reported
as a fault in-
BRC is de-
keyed by the
software.
The alarm is
cleared just
after BRC is
de-keyed.
The alarm may
be reported be-
cause of the
BRC hardware
failure.