TM 11-6625-3041-12/TO 33A1-8-908-1
3-12. FAULT INDICATORS
General
Built-In Test Equipment (BITE) for the SG-1139 consists of two
front panel fault indicators and a fault indicator on each of
the six circuit card assemblies. In addition, lack of proper
input signals can be monitored by the three BER indicators,
the ERRORS display, and the three input indicators (STA CLOCK,
DATA IN, TMG IN).
Front
POWER SUPPLY: When
Panel
lit, indicates a
fault on a power
Indications
supply card.
FAULT: When lit,
indicates a fault
on a power supply
or logic card, or under certain improper external conditions
such as crossed timing and data cables or when in the LOOPED
TIMING mode using loopback connections.
BER Indicators
(NO GO, MARGINAL,
G O : When not lit
or not blinking,
indicate a fault (FAULT indicator lit) or lack of an input
timing signal (TMG IN not lit).
ERRORS Display: Cleared when a fault is indicated (FAULT
indicator lit or input timing signal is not present
(TMG IN not lit).
