SECTION VIII
PHASE 7 DUAL MICROPROCESSOR CONTROLLER (DMC)
COMPUTER SYSTEM DIAGNOSTICS
IMPORTANT: YOU MUST DISCONNECTAND LOCK OUT THE ELECTRIC SUPPLY AND THE GAS OR STEAM SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVED FROM THE MACHINE, TO ALLOWACCESS FOR CLEANING,ADJUSTING, INSTALLATION, OR TESTING OFANY EQUIPMENT PER OSHA (Occupational Safety and HealthAdministration)
STANDARDS.
ALL major circuits, including the door, the microprocessor temperature sensor, and the heat and motor circuits are monitored. The Phase 7 dual microprocessor controller (DMC) computer will inform the user via the liquid crystal display (L.C.D.) of certain failure messages, along with light emitting diode (L.E.D.) indicators on the Inputs/Outputs (I/O) on the Phase 7 DMC (computer) board.
ERROR MESSAGES:
NOTE: Any error associated with the “Out of Order” message can be identified by pressing the “LO” key while in the “Out of Order” condition. If the “HI” key is pressed during this time, the remaining credit can be viewed. Any “Out of Order” message is immediately followed by a
A. DIAGNOSTIC L.C.D. FAULT MESSAGES
MODEL FAULT – This routine monitors the inputs, such as the sail switch and gas valve, to determine the type of dryer the Phase 7 DMC (computer) is. Steam dryers DO NOT use a sail switch or valve input, and an electric dryer will not use a gas valve input. These signals allow the Phase 7 DMC (computer) to interpret what type of dryer it is controlling. The Phase 7 DMC (computer) determines what the expected dryer responses should be for that specific
NOTE: If a model error occurs, the microprocessor will always default to the “gas” type for safety reasons. Also, the dryer is stopped and forced into a restart condition to reevaluate ALL expected responses.
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