TM 11-6625-3041-12/TO 33A1-8-908-1
3-13. FAULT ISOLATION TO A CARD SECTION
General
A fault can often be isolated to a section of a card. Although
which section is faulty (and therefore which sections are not
faulty) can allow the SG-1139 to be used in some applications
temporarily before repairs are made.
Lit Fault
Procedure
Indicator
Indication
Control settings:
Transmit 1
If fault indicator extinguishes
q
Fault Lit
at any DATA RATE setting, output
for that setting can be used.
TIMING . . . . MASTER
DATA RATE . Each
position
If fault indicator extinguishes,
Control settings:
q
output for the DATA RATE setting
TIMING . . . . STA CLK
that is the same as the station
DATA RATE . Same as
clock input can be used.
station
clock
Connect STA CLK
input (triaxial
connector) to
station clock.
If fault indicator extinguishes
Control settings:
Transmit 2
q
at DATA RATE setting of 576
Fault Lit
(ATACS, unbalanced NRZ) or 128
TIMING . . . . MASTER
thru 4608 (balanced NRZ), out-
DATA RATE . 576, 128
puts for those settings can be
thru 4608
used.
Control settings:
If fault indicator extinguishes
Receive 1
q
at DATA RATE setting of 576
Fault Lit
(ATACS, unbalanced NRZ) or 128
TIMING . . . . MASTER
thru 4608 (balanced NRZ), inputs
DATA RATE . 576, 128
for those settings can be used.
thru 4608
If ERRORS display is advancing
Normal measurement
Receive 2
q
count, error detection circuits
setup.
Fault Lit
are operating properly and can
be used. BER indicators are
inhibited and cannot be used.