62-11637 7–82
20100 NO COMM FROM MICRO TO DISPLAY
NOTE
This alarm will be available in the inactive alarm list and download only. It is an indication that an inter-
mittent failure is occurring, causing a break in the circuit sufficient to activate the alarm.
• ACTIVATION: If alarm 21100 “NO COMM FROM ANY BOARD TO MAIN MICRO“ is not active and main
microprocessor cannot communicate with the display module over the CAN bus.
• UNIT CONTROL: Alarm only, unit will continue to run. Module may display “LOSS OF COMMUNICATIONS”.
• RESET CONDITION: Auto reset when CAN communication is restored, 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 Notes 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 display LOSS OF COMMUNICATIONS message is displayed.
c. Check for CAN circuit continuity:
CAN Hi; Check entire circuit, 1MM−2 to DM−2. If circuit is open, check individual paths as follows:
1MM-2 through SP−1 to 1SVM-5 & ENCU−23 and 1SVM-2 & DM-2
CAN Lo; Check entire circuit, 1MM−4 to DM−6. If circuit is open, check individual paths as fol-
lows: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.
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