JPS63313241A - Method for starting circuit substrate testing program - Google Patents

Abstract

PURPOSE:To improve the efficiency of a test by mechanically and electrically operating a switch to set up a self-diagnostic mode and detecting a signal consisting of a pulse string supplied from the outside of a device by a microcomputer to start a test program. CONSTITUTION:After turning off the switch, a pulse signal generator 5 and an electronic circuit substrate tester 6 are connected to an electronic circuit substrate 100 and a pattern having a time factor which can not be easily generated by manual operation is inputted. The microcomputer 1 starts the electronic circuit substrate testing program built in it based on the inputted pattern. The tester 6 monitors the operation of the substrate 100 which can be previously predicted from the program to analyze faults in the microcomputer 1, the electronic circuit substrate testing program itself, an input side logic circuit 2, and an output side logic circuit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit board test program starting method, and particularly to a program starting method suitable for starting a test program for a single electronic circuit board.

[Conventional technology]

In recent years, microcomputers have been incorporated into various devices (eg, magnetic disk drives), and the magnetic disk drives control data input/output and data transfer. In an apparatus having such a microcomputer, a circuit board test program is built into the microcomputer in order to test a peripheral circuit board including the microcomputer. This test program is started by the tester.

Examples of related patents include JP-A-60-243731
Publication No. In this device, a test program is activated by a command from a host device.

[The interlayer point that the invention attempts to solve]

In the above-described conventional technology, main circuit parts such as a switching circuit, a determination circuit, and a control circuit must function normally. Furthermore, in a magnetic disk device having a microcomputer, if a test program is started during actual operation, the test program will cause the device to operate, which may cause a device failure.

An object of the present invention is to solve such conventional problems, and to improve the structure of a device that includes a microcomputer and is capable of determining all failure points in circuits connected to the microcomputer. An object of the present invention is to provide a method for starting a circuit board test program that improves test efficiency without being stuck in operation.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an apparatus having an electronic circuit board that has a switch that is manually switched, and that performs self-diagnosis by a microcomputer by switching the switch. It is characterized by starting a test program for a single electronic circuit board by operating it to enter self-diagnosis mode and using a microcomputer to detect a pulse train signal with a time element supplied from outside the device. .

[Operation] In the present invention, when a switch to be changed over manually is changed over manually, a preset pattern for activating the electronic circuit board test program of the microcomputer is not generated. Run the program.

Next, when the electronic circuit board is a single unit, the pattern generator that generates the set pattern generates the set pattern, and the electronic circuit board test program of the microcomputer is activated.

At this time, since the microcomputer does not have any circuit parts attached externally to the board, it can freely execute a program that operates the peripheral circuit elements, so that failures in the peripheral circuit elements can be easily analyzed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram for explaining a method for starting a circuit board test program according to an embodiment of the present invention.

This is an electronic circuit board 10 containing a microcomputer.
0 peripheral circuit and the circuit configuration of the tester. Further, FIG. 2 shows an example of the generated pattern.

In the figure, a microcomputer 1 included in an electronic circuit board 100 of a magnetic disk device has an input side logic circuit 2 connected to its input side, and an output side logic circuit 3 connected to its output side. The switch 4 is connected to the microcomputer 1, and by switching the switch 4, the operation is switched between an operation according to control (program) from a host device and an operation according to a self-diagnosis program that performs a self-diagnosis of the board 100.

Here, when diagnosing the board 100, the electronic circuit board is removed from the device to prevent the installation from malfunctioning. Next, a pulse signal generator 5 and an electronic circuit board tester 6 are connected to the electronic circuit board 100, and the pulse signal generator 5 generates a pattern (a pattern with a time element that cannot be easily generated manually). (see Figure 2). At this time, it is necessary that the switch 4 is off, so that the second
The signal of the figure pattern is input to the microcomputer 1.

The microcomputer 1 starts a built-in electronic circuit board test program according to the input pattern, and the electronic circuit tester 6 monitors the operation of the electronic circuit board predicted in advance from the electronic circuit board test program. , microcomputer 1. Electronic circuit board test program itself and input side logic circuit2. Failures in the output side logic circuit 3 can be easily analyzed.

For example, when this embodiment is applied to a magnetic disk device,
While operating the switch 4 mechanically or electrically,
The microcomputer's printed wiring board test program cannot be started without consciously inputting a pattern that cannot be easily generated manually.゛When I try to run the board test program, it does not run,
No failure will occur in the magnetic disk device.

As described above, in this embodiment, the electronic circuit board test program cannot be started unless the switch is switched and a predetermined signal is input to the electronic circuit board. It is possible to prevent damage to the device caused by starting the device while it is mounted on the board.

〔Effect of the invention〕

As explained above, according to one aspect of the present invention, in a device having a microcomputer, it is possible to determine all failure points in a circuit including the microcomputer and connected to the microcomputer, and the configuration as the device, Testing efficiency can be improved without being distracted by the operation.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a method of starting a circuit board test program according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a pattern input to a microcomputer. 1; Microcomputer, 2: Input side logic circuit, 3:
Output side logic circuit, 4: switch, 5: pulse signal generator, 6: electronic circuit board tester, 100: electronic circuit board.

Claims (1)

[Claims] 1. In a device having an electronic circuit board that has a switch that can be switched manually and that performs self-diagnosis by a microcomputer by switching the switch, the switch is mechanically or electrically operated to put the switch into a self-diagnosis mode; A method for starting a circuit board test program, characterized in that a test program for a single electronic circuit board is started by detecting a pulse train signal having a time element supplied from outside the device using a microcomputer.