GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 1 Direction 18000
8-4-1
SECTION 4 SYSTEM ERRORS
The following section describes system level error codes. Error codes which are specific to an individual
subsystem will be described in the subsystem manuals. These error codes are posted to the master terminal (the
Operator’s Console alphanumeric) when a fault occurs and is identified by the system. These faults may range
from a passing, correctable error to a fault which shuts the entire system down.
If the system shuts down entirely, with no error message, DO NOT RESET the computer. If the Disk Drive and/or
Mag Tape were in operation, check their status as described in Section 5 of this chapter. If the Disk and Mag
Tape status cannot be checked by the procedure in Section 5, check the computer as instructed in Section 5.
4-1 - Panic Codes
Panic Codes are posted to the Operator’s Console terminal as thee system shuts down due to a major fault. The
panic code message is posted as follows:
CPU Malfunction! CALL SERVICE... xxxxxx yyyyyy zzzzzz wwwwww uuuuuu
AC0 AC1 AC2 AC3 PANIC CODE
where:
xxxxxx is the contents of Accumulator 0
yyyyyy is the contents of Accumulator 1
zzzzzz is the contents of Accumulator 2
wwwwww is the contents of Accumulator 3
uuuuuu is the panic code
The following is a description of the panic codes and suggested action to take. If at all possible, save the patient
data from the disk first.
PANIC CODE (X may vary from 0 to 7)
1X0001 PROBLEM: File system inconsistency detected. An attempt was made to return a
master device block for which there was no record in MAP.DR.
RECOMMENDATION: Perform a full initialization. The disk can be dumped if no more disk block
acquisitions are attempted. Kill spooling before dumping.
1X0002 PROBLEM SYS.DR. error detected upon accessing a master device directory. Either
the entry count in a block of the directory exceeds 16 octal, or a free
entry
in the block was indicated yet none was found.(AC2)-the illegal count; if
(AC0) ≠16, a free block was indicated yet none was found.
RECOMMENDATION: In both cases, perform a full initialization.
1X0003 PROBLEM: Interrupt stack overflow. The low order bits of AC2 contain the address of
the overflowed interrupt stack. An overflowed interrupt stack generally
indicates the presence of a continually interrupting device. The device
code of the last device to cause the overflow is contained in AC1. If this
device code equals zero, the hardware priority interrupt chain is probably
broken.
RECOMMENDATION: Remove the problem and perform a partial initialization.
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