62-11785 7–88
25102 CHECK INPUT VOLTAGE STP1
• ACTIVATION: The stepper input voltage is reported out of valid range (9V to 17V) by stepper board 1 for
3 seconds as timed at stepper board.
• UNIT CONTROL: Alarm only. Steppers on board with problem disabled (Powered OFF) until good power
reported from Stepper Board at which point they are re-enabled.
• RESET CONDITION: 10 seconds of good voltage reported from all steppers.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 in Notes Section.) 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 voltages - Check and verify input voltage at SVM1.
2. Check Fuse F3
a. Visually check fuse. Verify correct fuse, and check fuse holder for damage, see Figure 2.4.
Replace fuse as required. Clear alarms, restart and check for repeat alarm(s).
b. Check voltage through the fuse. If fuse is blown, replace it.
c. Check wiring from PCM34 - SP-18 - 2SVM22. Verify there is no physical damage to harness, and
no damage, moisture, or corrosion in connectors.
3. Disconnect Stepper Valve(s), if alarm goes away: Check operation of suspected valve. Refer to Sec-
tion 8.7.7.
25200 NO COMM FROM MICRO TO STP2
• ACTIVATION: Alarm 21100 NO COMM FROM ANY BOARD TO MAIN MICRO is not active and no sync
responses have been received from the Stepper 2 Module for 10 seconds.
• UNIT CONTROL: Required Shutdown. If alarm remains active for 2 minutes issue a shutdown command
to all modules except the display.
• RESET CONDITION: Sync response received from the Stepper 2 Module in the past 10 seconds, 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). (See Note 1 in Notes Section.) Operate the unit through the appropriate modes to see if any active
alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
Check for 25100 NO COMM FROM MICRO TO STP1 - If AL25100 is not present, it indicates the SVM
Board is bad. Replace the SVM Board.
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