JPH06222095A - Heating cooking device - Google Patents

Abstract

PURPOSE:To easily discriminate which circuit out of circuits of a plurality of printed wiring boards has a defect, in a heating cooking device equipped with the printed wiring boards. CONSTITUTION:A heating cooking device includes a first printed wiring board 1 for mounting a first microcomputer 2 for heating cooking operation control and inspection operation control, a second printed wiring board 5 for mounting a second microcomputer 6 for display operation control and inspection operation control, a first and a second input parts 8a, 8b for setting and inputting a cooking condition and the like for inspecting circuits of the first and the second printed wiring boards 1, 5. And constitution is performed so that the input parts 8a, 8b are connected to the microcomputers 2, 6 respectively, and circuit inspection of the printed wiring boards 1, 5, can be performed individually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection structure of a circuit in a heating cooker.

[0002]

2. Description of the Related Art As a method of inspecting a circuit on a substrate including a microcomputer circuit of a microwave oven, for example, as shown in JP-A-60-39208, a plurality of keyboard switches are arranged in a prescribed order. There is a method of inputting and checking by automatically performing a predetermined output operation or the like by the inspection program.

[0003]

However, in recent years, due to the complexity and large scale of the control circuit, even in the heating cooker, the circuit is divided and mounted on a plurality of printed wiring boards. Then, even if it is found by inspection that the entire circuit is defective, it is no longer possible to quickly determine which circuit of the printed wiring board is defective.

The present invention has been made in view of the above circumstances, and in a heating cooker including a plurality of printed wiring boards,
An object of the present invention is to make it possible to easily find which printed wiring board circuit has a defect.

[0005]

In a heating cooker, a first printed wiring board on which a first microcomputer for heating and cooking operation control and inspection operation control is mounted, and for display operation control and inspection operation control. Second printed wiring board on which the second microcomputer is mounted, and first and second input units for setting and inputting cooking conditions and the like for inspecting circuits on the first and second printed wiring boards. And the first and second input units are connected to the first and second microcomputers, respectively, so that the circuit inspection can be performed using the first and second printed wiring boards alone.

[0006]

According to the present invention, the circuits of the first and second printed wiring boards are inspected by operating the first and second input sections.

[0007]

1 is a circuit diagram of an embodiment of the present invention.

Reference numeral 1 is a first printed wiring board on which a first microcomputer 2 for heating and cooking operation control and inspection operation control is mounted, and 3 is for driving a heating source such as a magnetron or a heater (not shown). A heating drive circuit, 4 is a sensor circuit for inputting the temperature in the heating chamber, 8a is a first input section for setting the first microcomputer 2 in the inspection mode, and 9a is a keyboard for operation.

Reference numeral 5 is a second printed wiring board on which a second microcomputer 6 for display operation control and inspection operation control is mounted, and 7 is an LED for displaying cooking conditions and the like.
A lighting drive circuit for driving the like to light, 8b is a second input section for setting the second microcomputer 6 in the inspection mode, 9b
Is a keyboard for operation. Reference numeral 10 is a transmission path for the first and second microcomputers 2 and 6 to communicate data with each other. Normally, display data is sent from the first microcomputer 2 to the second microcomputer 6 and second data is sent to the second microcomputer 6. The input content of the keyboard 9b is transmitted from the microcomputer 6 to the first microcomputer 2.

The inspection operation on the side of the first printed wiring board 1 will be described with reference to the flow chart showing the program contents stored in the first microcomputer 2 of FIG.

The keyboard 9a includes a range, an oven, a grill and a time key. First, when the power is turned on, in step S1, it is determined whether the input of the input unit 8a is ON or OFF. If it is not input and OFF and the inspection mode is not set, the process proceeds to normal processing, but when ON, the inspection mode is set If so, the process proceeds to step S2 to determine whether the range key has been operated. If it is operated, only the microwave is driven by the heating drive circuit 3. As a result, the microcomputer 2 and the heating drive circuit 3 are inspected.

If it is determined in step S2 that it is not the range key, it is determined in step S4 whether the oven key is operated. In this way, the pass / fail of the microcomputer 2 and the heating drive circuit 3 is inspected by driving the lower heater and the upper heater in steps S4 to S7. In S8 step, the time key operation is discriminated, in S9 step, it is discriminated whether or not the sensor input is a desired signal, and if not, only the microwave is driven in S10 step (this circuit has been inspected in S3 step). If the desired signal is not obtained, the microwave is turned off in step S11. As a result, the microcomputer 2 and the sensor circuit 4 are checked for pass / fail.

Next, the inspection operation on the second printed wiring board 5 side will be described with reference to the flow chart showing the program contents stored in the second microcomputer 6 of FIG.

The keyboard 9b has a candy and a thawing key for warming up. When the power is turned on, at step S1,
Whether the input of the input unit 8b is ON or OFF is discriminated, and if it is not input and is OFF and the inspection mode is not set, the process proceeds to normal processing.
Go to step. Then, the key input is discriminated in each of the S2 step, S4 step, and S6 step, and if there is an input, the desired display pattern determined in advance in each of S step 3, S step 5, and S step 7 is displayed. Accordingly, the pass / fail of the second microcomputer 6 and the lighting drive circuit 7 is inspected.

[0015]

As described above, the first and second printed wiring boards provided with the first and second microcomputers for heating and cooking operation control and display operation control respectively have the first and second input sections. Since it is possible to independently inspect by the operation by, the location of the defective circuit can be easily identified, and the number of steps for inspection and repair can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an inspection operation on the first printed wiring board side of the present invention.

FIG. 3 is a flowchart for explaining an inspection operation on the second printed wiring board side of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st printed wiring board 2 1st microcomputer 5 2nd printed wiring board 6 2nd microcomputer 8a 1st input part 8b 2nd input part

Claims (1)

[Claims] 1. A first printed wiring board on which a first microcomputer for heating and cooking operation control and inspection operation control is mounted, and a second microcomputer for display operation control and inspection operation control is mounted. A second printed wiring board and first and second input sections for setting and inputting cooking conditions for inspecting the circuits on the first and second printed wiring boards are provided. Each of the two input parts is
Connected to each of the second microcomputers,
The second cooker is a cooking device that enables circuit inspection with a single printed wiring board.