6-68 | Model 933 UV Analyzer
Alarm Type / Alarm Condition Description and Suggested Corrective Action
Fault Comm The Microcontroller board cannot establish reliable communications with
the Host Controller board.
Corrective Action:
Take appropriate safety precautions and:
• Cycle the analyzer AC power o for a minimum of 15 seconds before
cycling it on again.
• If this doesn’t correct the alarm, take appropriate safety precautions, click
Reset M933 on the Analyzer Information dialog box.
• If this doesn’t correct the alarm, take appropriate safety precautions, open
the Electronics Enclosures, and:
- Reset the Host Controller board (SW100, Lower Enclosure – see
Figure 6-15).
- Reset the Microcontroller board (SW400, Upper Enclosure – see
Figure 6-16).
• Check the connections of the cable between the Host Controller (J300)
and Micro-Interface (J104) boards. Inspect it for damage (cuts, nicks,
burn marks, etc.).
• Replace the Microcontroller, Host Controller, and/or Micro-Interface
boards. Contact AMETEK to verify operation before removing any of
these boards.
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