This section includes the symptoms that can appear as a visual indication or message on the front of
the keyboard/display module. These messages may appear (depending upon their seriousness) either
at the time that the problem occurs or in the instrument' s Self Test.
Messages resulting from the automonitoring software within the instrument will be one of four classes:
H2 ALARM -
The FATAL ERR: message is the most serious. This class of message indicates that the HP 5890 SE-
RIES II is essentially nonfunctional. The instrument will always go to a NOT READY state and even the
keyboard is inoperative.
FATAL ERR: EPP & FLOW Indicates Electronic Pressure Control (EPC) and Electronic Flow Sen-
sor(EFS) modules are installed simultaneously. The instrument must be powered down and one of two
modules must be removed to correct this situation. No damage should occur to the instrument.
FATAL ERR: BAD RAM indicates a problem with RAM chip and its circuitry in the CPU Section of Main
Board. Replace Main Board.
FATAL ERR: BAD ROM indicates a problem with ROM chip and its circuitry in the CPU Section of Main
Board. Replace Main Board.
FATAL ERR: > !25 MS indicates that the 40 Hz task couldn' t complete within !25 milliseconds. Suspect
a problem with the Clock Section of the Main Board; however, the CPU Section could also cause this
indication. Replace Main Board.
FATAL ERR: STACK ERR indicates that stack is beyond legal limits. Suspect a problem in the CPU Sec-
tion of the Main Board. Replace Main Board.
FATAL ERR: RUN CNTL indicates that the Run Control task couldn' t complete within 25 milliseconds.
Suspect a problem with the Clock Section of the Main Board; however, the CPU Section could also
cause this indication. Replace Main Board.
As can be seen from the FATAL ERR: message listing above, they are generally an indication that a fail-
ure exists either in the Clock or CPU Sections of the Main Board. The Clock Section operation can be
easily checked by measuring the frequencies on its outputs. Once the clocks are verified to be good,
the CPU (Z80) could be checked by substitution.
The H2 ALARM message indicates a failure of the system to hold or reach the electronic pressure set-
point. All electronic pressures and heated zones will be shut off. To recover, the problem must be cor-
rected and the GC power cycled.
H2 ALARM - EPP A indicates electronic pressure problem with
the A systems ability to hold pressure. Possibly a leak, trouble shoot the proportional control valve,
pressure transducer and the inlet in the case of the EPC. Trouble shoot the forward pressure regulator
and gage in the case of the MPC.
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