Troubleshooting Guide - Dacor DCM24B Service Manual

Dcm convection microwave oven

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Use and care manual (63 pages)

Table Of Contents

Table of Contents

DCM24B

DCM24R

DCM24S

Convection Cooking:

Damper is in the closed position, so that no hot air will be

allowed to leak out the oven cavity.

Damper Operation

1. When power supply cord is plugged in:

1-1. When power supply cord is plugged in, a signal is

sensed in the control unit, and operates shut-off

relay (RY4).

1-2. Contacts of shut-off relay (RY4) close, the damper

motor is energized, opening the damper door.

1-3. When the damper is moved to the open position by

the damper cam the damper switch is closed (ON

position).

1-4. The signal from damper switch is re-sensed in the

control unit and shut-off relay (RY4) is turned off.

1-5. The 120 volts A.C. to the damper motor is removed

and 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 the

convection, temperature and START pads.

3-2. When damper is in the closed position (damper

switch is OFF), its signal is sensed by the control

unit, and shut-off relay (RY4) is de-energized.

Never 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. Many

of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which

will 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 the

monitor 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 completed

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. 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.

NOTE: If the damper door is not in the proper position,