Anatel A643a - Troubleshooting 175 of 220
RPS - June 2007 - Edition 12
Anatel Operator Manual
14 Troubleshooting
14.1 General Information
In addition to the standard self-tests conducted by the Anatel A643a during its analyses, an
extended diagnostic and reporting facility is incorporated to inform the user about the nature of
a problem. Alarm Codes, in conjunction with user-initiated diagnostic tests, serve to isolate the
source of the problem.
The checksum value of the Analyzer’s controlling EPROM and its current firmware version may
be displayed by pressing the Chnl Key twice. This ROM checksum is routinely calculated as
part of the instrument’s power-up diagnostics and is the same checksum value that would be
produced by a device programmer. The ROM checksum and firmware version are also
available on the Sensor Factory Configuration printout (see “Printouts” on page 117).
14.2 Alarm Codes
Functional range and logic checks are reviewed continuously to determine the functional status
of each instrument during every analysis. If one or more alarms is detected, the Controller’s
display and the faulty Anatel A643a’s corresponding LED begin flashing (see “Alarm Reporting”
on page 105). The appropriate Code is logged for display and output to the printer. Any
reported problems fall into two code classifications: hardware and water chemistry.
Hardware alarms (Codes 1-99) are indicative of either an electromechanical or analytical
failure of the Analyzer. These alarms could result from such conditions as an exhausted UV
lamp, a faulty solenoid valve or a hardware malfunction.
Computational results are still reported, and a recovery is attempted by initiating a new analysis
cycle. If the recovery is successful, the red Channel LED returns to green (although the alarm
is logged for display on the Controller and output to the associated printer) and normal
operation resumes.
If the recovery is unsuccessful, attempts persist and the results of the most recent successful
analysis are displayed. The Controller display and the Channel LED continue to flash red
until acknowledged by pressing the Alarm Key. Once acknowledged, the relevant Code is
displayed and the Controller stops flashing. But the Channel LED is not restored to green until
a successful analysis cycle is completed. If an alarm occurs during a diagnostic test, the
Analyzer will not attempt another measurement until the displayed alarm is acknowledged by
pressing the Alarm Key. After the problem has been corrected, the diagnostic test may be
re-initialized.
Each instrument maintains a log consisting of the Code number, the total number of
occurrences of that particular type of alarm and a time stamp of its initial occurrence. The log
is erased whenever power is cycled on the instrument or when the ME command is issued (see
“Mode Set Commands” on page 149).
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