Dacor DCM24B Service Manual

Also see for DCM24B: Use and care manual

Contents

Dacor DCM24B Service Manual Manual pdf 15 page image

12DCM24BDCM24RDCM24SConvection Cooking:Damper is in the closed position, so that no hot air will beallowed to leak out the oven cavity.Damper Operation1. When power supply cord is plugged in:1-1. When power supply cord is plugged in, a signal issensed in the control unit, and operates shut-offrelay (RY4).1-2. Contacts of shut-off relay (RY4) close, the dampermotor is energized, opening the damper door.1-3. When the damper is moved to the open position bythe damper cam the damper switch is closed (ONposition).1-4. The signal from damper switch is re-sensed in thecontrol unit and shut-off relay (RY4) is turned off.1-5. The 120 volts A.C. to the damper motor is removedand the motor turns off.2. When oven is microwave cooking:Damper is in the open position.3. When oven is convection cooking:3-1. Damper motor is energized by touching theconvection, temperature and START pads.3-2. When damper is in the closed position (damperswitch is OFF), its signal is sensed by the controlunit, and shut-off relay (RY4) is de-energized.3-3. The damper is held in the closed position during theconvection cooking operation.3-4. At the end of the convection cooking, shut-off relay(RY4) is energized, and the damper is returned tothe open position.NOTE: If the damper door is not in the proper position,closed during convection or open during microwave,the control unit will stop oven operation after 1minute.Figure D-2. Damper MechanismTROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Manyof the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter whichwill be found in the "Test Procedure "section.IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing themonitor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA012WRK0 as an assembly.IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,be necessary to connect the power supply cord after the outer case has been removed, in this event,1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.4. Disconnect the leads to the primary of the power transformer.5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.6. After that procedure, reconnect the power supply cord.When the testing is completed1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.4. Reconnect all leads removed from components during testing.5. Reinstall the outer case (cabinet).6. Reconnect the power supply cord after the outer case is installed.7. Run the oven and check all functions.DAMPER DUCTDAMPERDAMPER CAMDAMPER MOTORDAMPER SWITCHDAMPER SHAFT