62-61753-217-47AlarmNO. Steps ALARM / CAUSE CORRECTIVE ACTION77 EVAP (EVAPORATOR) MOTOR OVERHEATED TRIGGER-ON: The evaporator fan motor Internal Protectors (IP-EVM1 AND 2) is open. UNIT CONTROL: Engine and standby operation: Evaporator will shut down. RESET CONDITION: Auto Reset after a 15 minute off time when motor overload input is within limits,or change to engine operation, or alarm may be manually reset via keypad or 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, the activealarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see ifany active alarm occurs. Continue with the steps below as necessary.1 Check Evaporator Fan Blades for Free Operationa. Visually inspect evaporator fan forany foreign material or damage oranything that will prevent the bladeand motor from turning freelyBlower wheel must be in good condition.No sticks or other material obstructing its movementNo ice build-up preventing blade rotation.2 Check For Power At 4MP3b. If 12VDC Alarm should have cleared itself.a. If no power (0VDC) Continue with step 2 below.3 Check IPC Circuita. Use Component Test Mode to testactual current draw of the circuit.(Refer to Section 5.1.2.)Component FET or board LED (refer to Table 5-1)must be illuminated.View current draw in Data List.Refer to Section 2.12 for normal current values.b. Unplug the connector to the evap-orator fan motor and check voltageon IP-EVM (white) wire.12 VDC between pin 4 in the engine harness connect-or and Ground.c. Check MPQC9. There should be 12 VDC from MPQC9 to Ground.d. Test continuity through IPC. Should be 0 Ohms. If the evaporator fan motor is ex-tremely warm, allow it to cool off, then recheck IPCcontinuity.e. Test IP circuit from evaporator fanmotor junction box to microproces-sor.12 VDC at 4MP34 Check Evaporator Fan Motor Contactora. Inspect the wire connections to thecontactor.No signs of overheating of the contactor. Wiring isrouted correctly to the contactor.b. Check tightness of the contactorwire connectionsTighten with screwdriver and check for discoloration ofwires.5 Perform Pretripa. Clear Active Alarm list, then runPretrip & check for any newalarms.Any active alarms must be corrected and cleared be-fore proceeding.Additional steps on the next page.