Maintenance and Diagnostics
indicator
messages
connection on loop
CPU
Central
processing unit
Blinks at rate of once
per second
LED does not blink.
CPU not functioning
Check power
input. Replace
CPU board.
Aux
Auxiliary input
frequency signal
indicator
Blinks if auxiliary input is
present
None
Check auxiliary
input wiring
terminals 11 and
12 with meter for
frequency signal.
Check auxiliary
input equipment.
HV
Sensor high
voltage
On - high voltage is
within specification
Off-high voltage is
outside of
specification
Call VEGA Field
Service.
Field
Radiation field
indicator
Cycles in proportion to
radiation field intensity
at detector. On for 10
seconds for each
mR/hr, then off for 2
seconds. (Use LED 5,
which blinks 1
time/second to time
LED1 for field indicator.)
None
Check for closed
source shutter,
buildup, and/or
insulation.
Field Repair Procedures
Use appropriate electrostatic discharge procedures to prevent damage to
the electrical components of the gauge.
Before replacing a circuit board, call VEGA Field Service.
The sensor EEPROM contains a backup of the CPU board EEPROM. After replacing
the CPU board, you must perform a memory backup to update the CPU board’s
EEPROM with the information in the sensor board EEPROM.
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