AR 10044005, Operating And Service Manual

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Model 5000A225A
Rev B 49
4.3.6 Fault Troubleshooting Guide
Driver
Fault Type of Fault Possible Reasons
Therm driver Thermal Driver fan blocked or clogged, PS2 has no output
UC driver A10 Under Current Driver FET is damaged and drawing no current, Gate voltage is being pulled down
OC driver A10 Over Current
Driver FET had been over driven. Usually resettable and cured by backing off input
drive
PS2 driver Power Supply PS2 has failed
ALC leveling ALC circuit is not working and allowing the RF power to exceed a preset limit
MPA
Fault Type of Fault Possible Reasons
485 MPA(1,2) (A1-
A4,A6)
Communication
Incorrect address setting on module bias boards or transmit bd, damaged transmit
or bias bd
Therm MPA(1,2) (A1-
A4)
Thermal Coolant line disconnected, blockage of coolant flow through module listed
UC MPA(1,2) (A1-A4) Under Current
Final module FET is damaged and drawing no current, insufficient gate voltage to
FET
OC MPA(1,2) (A1-A4) Over Current
Final module FET had been over driven. Usually resettable and cured by reducing
input drive
PS1 Final MPA(1,2) Power Supply PS1 has failed inside MPA (1,2)
PS2 Final MPA(1,2) Power Supply PS2 has failed inside MPA (1,2)
Coolant level MPA(1,2) Coolant Radiator is low and needs coolant added.
Flow MPA(1,2) Coolant Flow is blocked, Sensor is defective
Thermal MPA(1,2) Thermal Radiator fan has stopped, PS1 is defective
Other
Fault Type of Fault Possible Reasons
Comb Thermal Thermal Combiner fans blocked or clogged
*NOTES: Driver A1 refers to the driver module within the driver assembly
(A1-A4) refers to the power modules within the MPA assembly
A6 refers to the transmit board assembly