SHARP R-677(AL)
Service Manual

OPERATION SEQUENCE CONT...
TOP GRILL MODE In this mode, the food is cooked by the grill heating element (top grill). Select the TOP GRILL mode with the COOKING MODE selector. Enter the cooking time by rotating the TIME/WEIGHT dial. When the START button is pressed, the following operations occur: 1. 2. 3. 4. 5. Figure O-3(a) on page 33 The relay RY1 + RY3 + RY5 are energized. The numbers of the digital readout start the count down to zero. Then the grill heating element (top), turntable motor, oven lamp and fan motor are energized. Now, the food is grilled by the grill heating element. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays RY1 + RY3 are opened, then the grill heating element (top), turntable motor and oven lamp are de-energized. The relay RY5 stays closed for five (5) minutes, and the fan motor operates. 6. The relay RY5 stays closed for five (5) minutes, and the fan motor operates.

DUAL COOKING CONDITION
The oven has two dual cooking mode. One is MICROWAVE AND TOP GRILL mode and other one is MICROWAVE AND BOTTOM GRILL mode. In both modes, the relay RY2 operates intermittently with in a 48 seconds time base as shown below. Power level ON time OFF time 100% 48 sec. 0 sec. 70% 36 sec. 12 sec. 50% 26 sec. 22 sec. 30% 16 sec. 32 sec. 10% 8 sec. 40 sec. MICROWAVE AND TOP GRILL MODE (DUAL 1) In this mode, the food is cooked by microwave and the grill heating element (top). Select the MICROWAVE AND TOP GRILL mode with the COOKING MODE selector and then select the power level with the WATT button. Enter the cooking time by rotating the TIME/WEIGHT dial. When the START button is pressed, the following operations occur (Fig. O-4(a)): 1. The relay RY1 + RY2 + RY3 + RY5 are energized. 2. The numbers of the digital readout start the count down to zero. 3. The grill heating element (top), high voltage transformer, turntable motor, oven lamp and fan motor are energized. 4. Now, the food is cooked by the microwave and grill heating element (top). 5. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays RY1 + RY2 + RY3 are opened, then the grill heating element (top), high voltage transformer, turntable motor and oven lamp are de-energized. 6. The relay RY5 stays closed for five (5) minutes, and the fan motor operates. MICROWAVE AND BOTTOM GRILL MODE (DUAL 2) In this mode, the food is cooked by microwave and the bottom heating element. Select the MICROWAVE AND TOP GRILL mode with the COOKING MODE selector and then select the power level with the WATT button Enter the cooking time by rotating the TIME/WEIGHT dial. When the START button is pressed, the following operations occur (Fig . O-4(b)): 1. The relay RY1 + RY2 + RY4 + RY5 are energized. 2. The numbers of the digital readout start the count down to zero. 3. The bottom heating element, high voltage transformer, turntable motor, oven lamp and fan motor are energized. 4. Now, the food is cooked by the microwave and bottom heating element. 5. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays RY1 + RY2 + RY4 are opened, then the bottom heating elements, high voltage transformer, turntable motor and oven lamp are de-energized. 6. The relay RY5 stays closed for five (5) minutes, and the fan motor operates.

6.

BOTTOM GRILL MODE In this mode, the food is cooked by the bottom heating element. Select the BOTTOM GRILL mode with the COOKING MODE selector. Enter the cooking time by rotating the TIME/WEIGHT dial. When the START button is pressed, the following operations occur: 1. 2. 3. 4. 5. Figure O-3(b) on page 33 The relay RY1 + RY4 + RY5 are energized. The numbers of the digital readout start the count down to zero. Then the bottom heating element, turntable motor, oven lamp and fan motor are energized. Now, the food is grilled by the bottom heating element. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays RY1 + RY4 are opened, then the bottom heating elements, turntable motor and oven lamp are de-energized. The relay RY5 stays closed for five (5) minutes, and the fan motor operates. TOP AND BOTTOM GRILL MODE In this mode, the food is cooked by both the grill heating element (top grill) and bottom heating element. Select the TOP AND BOTTOM GRILL mode with the COOKING MODE selector. Enter the cooking time by rotating the TIME/WEIGHT dial. When the START button is pressed, the following operations occur: Figure O-3(c) on page 34 The relay RY1 + RY3 + RY4 + RY5 are energized. The numbers of the digital readout start the count down to zero. Then the grill heating element (top), bottom heating element, turntable motor, oven lamp and fan motor are energized. Now, the food is grilled by the grill heating element (top) and the bottom heating element. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays RY1 + RY3 + RY4 are opened, then the grill heating element (top), bottom heating element, turntable motor and oven lamp are de-energized.

6.

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4. 5.

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