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NG1000 Troubleshooting Manual
Responding to alarms
Page 1-8
Issue 0.4 2010-10-12
Coax Switch Fault
EXTERNAL
This alarm occurs when the RF coaxial switch’s
position does not agree with the desired switch
position command. The system RF output is inhibited
by opening the associated transmitter interlock
circuits. If the alarm persists, replace the RF coaxial
switch (see
“RF Coaxial Switch Replacement” on
page 1-26
).
DIn1(J11A-1) Fault
EXTERNAL
This alarm occurs when the digital input applied to the
auxiliary digital input 1 (pin 1 on
AUX I/O
connector
A1J11A) is in an alarm sensing condition, defined by
the user.
DIn2(J11A-2) Fault
EXTERNAL
This alarm occurs when the digital input applied to the
auxiliary digital input 2 (pin 2 on
AUX I/O
connector
A1J11A) is in an alarm sensing condition, defined by
the user.
DIn3(J11A-3) Fault
EXTERNAL
This alarm occurs when the digital input applied to the
auxiliary digital input 3 (pin 3 on
AUX I/O
connector
A1J11A) is in an alarm sensing condition, defined by
the user.
DIn4(J11A-4) Fault
EXTERNAL
This alarm occurs when the digital input applied to the
auxiliary digital input 4 (pin 4 on
AUX I/O
connector
A1J11A) is in an alarm sensing condition, defined by
the user.
Sys Con Pri (or Sec)
AC High
EXTERNAL
This alarm occurs when the primary or secondary ac
source voltage applied to the system controller (A1) is
greater than 134 V. Check the ac power sources. If
they are OK, suspect a fault with the system controller
PWB (A1). To replace a system controller PWB, see
“System Controller PWB Replacement” on page 1-23
.
Sys Con Pri (or Sec)
AC Low
EXTERNAL
This alarm occurs when the primary or secondary ac
source voltage applied to the system controller (A1) is
less than 92 V. Check the ac power sources. If they
are OK, suspect a fault with the system controller
PWB (A1). To replace a system controller PWB, see
“System Controller PWB Replacement” on page 1-23
.
Alarm (with Prefix)
Alarm/Status LED
Description and Troubleshooting Action
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