User's Manual

Table Of Contents
10/19/07 888-2687-001 3-9
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation/Adjustments
Ranger ™ Mobile Series
Table 3-1 PA Module Faults
Fault Fault limit Action Taken
Frequency Channel frequency or frequency band reported by module does
not match system settings. Affects Module Calibration.
Warning
EEPROM Error was detected writing to EEPROM on Module Controller Warning
Reference +5V reference voltage is not within tolerance Warning
+12V Fault +12V not in tolerance Warning
Com Fail Module is not talking on CAN bus. Module might continue
operating. Re-seat module to see if problem clears.
Warning
Pallet Over-current Amplifier pallet current has exceeded 12 amps. Most likely
blown FET
Module shuts off
Driver Pallet Over-
current
Amplifier pallet current has exceeded 12 amps. Most likely
blown FET. Note that this reading also includes current for Phase
and gain driver transistors
Module shuts off
LDMOS Fail FET failure based on pallet current levels. Fault is set for each
push-pull pair. Fault is set when pallet current is less than 60% of
highest pallet current in module. If pallet current is below 40%,
the whole pallet is considered bad which is 2 LDMOS failures.
For pallet replacement procedure refer to Section 5.
Up to 3 LDMOS faults
on a single module =
warning. 4 LDMOS
faults = OFF
Over Voltage +32V source has exceeded 33V Module 3 strike
Under Voltage +32V source is below 30 V Module 3 strike
Over Current Total current on +32V line has exceeded 75A Module 3 strike
Over Temp Module temperature has exceeded 95
o
C Module 3 strike
High VSWR Internal reflected RF too high. About 200W of reflected power.
Most likely a bad cable or circulator
Module 3 strike
Over Drive Input RF is too high. Trip point set to 1.9dB above nominal or
approximately 23mW
Module 3 strike
Low Input Input RF is too LOW. Module continues to run Warning
AGC Unlock Module AGC circuit is unable to maintain constant gain. Module
gain is 46dB. This fault means the DAC number for the I or Q
Vector reading on the PA Data screen has reached “0” or “4095”
and the module gain is still not 46dB
Module 3 strike