Ametek 931S

Maintenance and Troubleshooting | 6-63
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
2 4 Fault f: On-chip A/D not responding
The Microcontroller board’s internal analog-to-digital converter (A/D) is not
responding.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Replace the Microcontroller board. Contact AMETEK to verify operation
before removing this board.
3 8 Fault f: OBMC-HC communication problem
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, open the
Lower Enclosure, and:
• From the Info dialog box and click the HC Reset button to reset the Host
Controller board.
If this still doesn’t correct the alarm, open the Electronics Enclosures, and:
- Reset the Host Controller board (press SW100, Lower Enclosure – see
Figure 6-15).
- Reset the Microcontroller board (press SW400, Upper Enclosure – see
Figure 6-16).
• Check the connections of the cable between the Host Controller (J300) and
Micro-Interface (J104) boards. Also, 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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