7–83
62-11637
21100
NO COMM FROM ANY BOARD TO MAIN MICRO
NOTE
This alarm will be available in the inactive alarm list and download only. It is an indication that an inter-
mittent problem has occurred and a careful diagnosis is required.
• ACTIVATION: Main microprocessor cannot communicate with any modules over the CAN bus.
• UNIT CONTROL: Shutdown and alarm. Display module may display “LOSS OF COMMUNICATIONS”.
• RESET CONDITION: Auto reset when CAN communication is restored, or alarm reset or Alarm may be
manually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in
Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check CAN Bus
a. Inspect connector pins & terminals on 1MM, 1SVM, DM and ENCU. Verify no damage or corrosion in
connections.
b. Check for CAN continuity:
CAN Hi; 1MM-2 through SP
−
1 to 1SVM-5 & ENCU
−
23 and 1SVM-2 & DM-2.
CAN Lo; 1MM-4 through SP
−
4, to 1SVM-7 & ENCU
−
24, and 1SVM-4 & DM-6.
Check for good continuity. If not, check connectors and wiring between terminals. Verify no damage,
moisture or corrosion.
2.
Check for other CAN Bus Alarms
This alarm may accompany by other alarms, complete troubleshooting steps for alarms found. If repairs
have been made and the other alarms have cleared, further troubleshooting may not be required. If this
alarm reoccurs, check CAN bus as described in the proceeding step.
3.
Perform and Analyze a Data Download
22100
NO COMM FROM MICRO TO INPBD1
• ACTIVATION: Main microprocessor cannot communicate internally.
• UNIT CONTROL: Shutdown all modules except the display and alarm. (The alarm will only display if the dis-
play module is communicating.) Main microprocessor status LED will illuminate steady green (not pulsing).
• RESET CONDITION: Auto reset when internal communication is restored, alarm reset, or alarm may be
manually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in
Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Replace Main Microprocessor
Download data and replace main microprocessor. For complete Main Microprocessor Module replace-
ment instructions refer to
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