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B-25
Factory Authorized Quick Access Codes (50-99) are only accessible once Factory Authorized
Access Code (FAAC) has been entered. See previous description of the FAAC.
50 Helix Over Voltage Fault
54 CHPA HVPS Test Mode
51 Helix Under Voltage Fault
55 Reset Heater Elapsed Time Meter
52 Helix Average Over Current Fault
56 Reset Beam On Elapsed Time Meter
53 Helix Voltage Detected in Standby
57 Reset to Factory Defaults
B.15 POST
Faults
Possible POST faults are described in Table B-14.
Table B-13. POST Faults
Test #
POST Fault Name
1
A/D Calibration
: The A/D converter has not responded to a command within a specified time
limit during calibration, or the accuracy of the A/D converter is not within 10 bits of Vref+.
2
A/D Initialization
: The A/D converter has not responded to a command within a specified time
limit during initialization.
3
BBRAM Memory
: The contents of the RTC BBRAM is read, written, then read back. This error
occurs if the checksum for the data read back is bad.
4
EPROM Memory
: The EPROM modulo 256 memory check has failed. The memory is tested by
summing up all bytes in the EPROM.
5
RTC Not Running:
When the unit is first turned on the RTC is read. The RTC is read again
>1.5 seconds later. This error occurs if the RTC seconds have not changed after 1.5 seconds.
6
RTC Stuck in Update:
A flag within the RTC indicates if it’s in the process of updating the
current time. This error occurs if the flag doesn’t clear within a specified time limit.
7
Static RAM Memory
: This error occurs if this static RAM test fails. The memory is tested by
shifting a bit through all eight of each byte.
8
RAM size Error:
If SRAM (U2) on controller is smaller than 128Kx8, this error will appear.
