Honeywell SPZ-8000 Pilot's Manual page 255

If a failure is detected during TEST mode, a corresponding fault code
is displayed next to the TEST mode field, as described in Table B--2.
EFIS Fault
Code
00
01
02
03
04
05
06
07
A28--1146--055
REV 2
SPZ--8000 Digital Integrated Flight Control System
Fault Description
No fault detected.
The antenna is not scanning or it is not scanning
correctly.
Antenna stabilization errors.
Radar receiver fault.
The radar signal mixer current is out of
specification -- probably due to defective mixer
diodes.
Radar automatic frequency control fault. Can be
caused by defective transmitter. This fault can be
observed in TEST by the display of a broken
noise band.
Indicates abnormal fan current for extended
period of time.
Central processing unit (CPU -- microprocessor)
fault in RTA.
EFIS Fault Code Descriptions
Table B--2
R
PRIMUS 650 Weather Radar System
B--11