Specifications
6-12 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 6 Diagnostics
Platinum VAX-C Series
Table 6-6 PFRU Faults
Fault Log Message Fault Description
Front Panel
LEDs
Nominal Value/
Scaling
Trip Level
Frequency Ref. Not
Alive
Indicates PFRU is in known
good state
System and
Mute LEDs red.
Data pattern written/
read over HPI
matches and board
ID is correct
Data pattern written/
read over HPI does not
match or board ID is
not correct
Frequency Ref.
External 1PPS
External 1 pps is not present
when it is required
System and
Mute LEDs red.
External 1pps
present
SFN mode and external
1pps not present when
selected as reference
Frequency Ref.
External 10MHz
External 10 MHz is not present
when it is required
System and
Mute LEDs red.
External 10 MHz
present
SFN mode and external
10 MHz not present
when selected as
reference
Frequency Ref. GPS
1PPS
1pps from internal GPS is not
present when it is required
System and
Mute LEDs red.
1pps from internal
GPS present
SFN mode and 1pps
from internal GPS not
present when selected
as reference
Frequency Ref. IF LO
PLL Not Locked
PFRU DAC PLL lock state System and
Mute LEDs red.
DAC PLL lock bit
from PFRU FPGA
set
DAC PLL lock bit from
PFRU FPGA not set
Frequency Ref. RF
LO PLL Not Locked
PFRU RF PLL lock state System and
Mute LEDs red.
RF PLL lock bit
from PFRU FPGA
set
RF PLL lock bit from
PFRU FPGA not set
Frequency Ref. PLL
Undisciplined
Selected reference for 10 MHz
OCXO missing in DAB mode
System and
Mute LEDs red.
Reference present SFN mode and selected
reference not present
Frequency Ref. 1PPS External 1 pps is not present System LED
orange.
External 1pps
present
External 1pps not
present when selected
as reference
Frequency Ref.
10MHz
External 10 MHz is not present System LED
orange.
External 10 MHz
present
External 10 MHz not
present when selected
as reference
Frequency Ref. GPS
1PPS
1pps from internal GPS is not
present
System LED
orange.
1pps from internal
GPS present
1pps from internal GPS
not present when
selected as reference
Frequency Ref. PLL
Undisciplined
Selected reference for 10 MHz
OCXO missing in DAB mode
System LED
orange.
Reference present Selected reference not
present