27
TROUBLE SHOOTING
The TCII has certain required parameters. When anomalies happen and the TCII starts to operate outside the
specified parameters, the fault indicator light will be activated and the system status will scroll across the top
of the HOME screen.
Below is a list of faults along with the possible causes and solutions.
Fault
Cause
Solution
COMMS FAIL
IDU not communicating with
ODU.
Check connections. Shut down
then restart the TCII to reset.
DIGITAL COMM FAIL
Internal Failure
Shut down then restart system to
reset. If fault is still present, then
contact BMS.
FAIL-SAFE MODE
The TCII has experienced a failure
that caused the transmission to be
shut down.
Shut down then restart system to
reset. If the TCII is still in FAIL-
SAFE mode, identify the fault and
follow the recommended solution.
IFU PLL UNLOCK
Internal Failure
Shut down then restart system to
reset. If fault is still present, then
contact BMS.
INPUT RF POWER TOO HIGH
RF Power at ODU exceeds limit
Check RF Power Out at IDU
INPUT RF POWER TOO LOW
RF Power at ODU too low
Check RF Power Out at IDU, check
coaxial connections
INPUT RF POWER UNSTABLE Too much power fluctuation
Check the coaxial connections
INPUT VOLTAGE TOO HIGH
Possible power supply failure
Check for 48 V@ IDU out. Contact
BMS
INPUT VOLTAGE TOO LOW
Not enough voltage into ODU
Check connections, Check cable
impedance/ verify setting in TCII.
Check for 48V out @ IDU.
PA TEMPERATURE GETTING
HIGH
PA Temp between 73º C and 85º C RF Power will automatically go
into LOW power mode. Limit
transmission and/or Wait for
Temperature to fall below 73º C.
PA TEMPERATURE TOO
HIGH
PA Temp has exceeded 85º C
Put in STANDBY Mode. Wait for
ODU to cool.
POST/BIST FAIL
Internal Failure
Shut down then restart system to
reset. If fault is still present, then
contact BMS.
RF OUTPUT POWER TOO
HIGH
Exceeded the RF Power Output
Limit
Contact BMS
RF OUTPUT POWER TOO
LOW
Not enough RF Output Power
Check connections
RFU PLL UNLOCK
Internal Failure
Shut down then restart system to
reset. If fault is still present, then
contact BMS.
THERMAL SETBACK
PA Temp above 73º C. RF Power
is automatically reduced
Limit transmission. Wait for PA
Temp to fall below 73º C.
THERMAL SHUTDOWN
PA Temp above 85º C. RF
transmission automatically shut
down.
Wait until PA Temp falls below 73º
C for normal transmission.
Summary of Contents for Truck-Coder II
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