Excavating
Patent
1996-10-21
1998-07-07
Beausoliel, Robert W.
Excavating
39518301, 364580, G01R 3128
Patent
active
057780064
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of and an apparatus for diagnosing a device for recording data on and reproducing data from a recording medium, a device for recording data on a recording medium, or a device for reproducing data from a recording medium, such as a video tape recorder, a disk recording and reproducing device, a digital audio tape recorder, or the like, for example.
BACKGROUND ART
The performance of electronic devices such as VTRs or the like has increased rapidly in recent years in efforts to meet customer's needs, with resultant complexities in the internal structure of the electronic devices. Particularly, electronic devices used in broadcasting stations and for production and postproduction stages have more complex functions and structures than electronic devices for general users. For satisfying strict demands for image quality and sound quality, it is an indispensable task to adjust the electronic devices and check the electronic devices for any malfunctioning in its early stages. Those who repair electronic devices need a considerable level of professional knowledge.
Since there are many types of electronic devices, a considerable number of servicemen depending on those many types of electronic devices are required for servicing, i.e., repairing and adjusting, the electronic devices. However, it is difficult to keep many servicemen who have are professionally knowledgeable enough to handle electronic devices which have complex internal structures and need complex adjustment procedures.
Heretofore, it has been customary for electronic device manufacturers to issue service manuals of adjustment and repair procedures for servicemen to understand procedures to repair and adjust electronic devices and also to locate faults.
When a serviceman adjusts or repairs an electronic device with such a service manual, however, he has to spend a considerable period of time until the adjustment is finished or the fault is located, and the adjusted or repaired condition hinges on the technical knowledge or skill of the serviceman.
Electronic devices such as VTRs which use magnetic tapes are heretofore designed such that when they suffer a fault while the magnetic tape is being transported, their display unit displays a code representative of the fault that has occurred. Specifically, when a VTR suffers a fault while the magnetic tape is being transported, it generates code data corresponding to the fault or its pattern, converts the code data into character data, and displays the character data.
For example, there is known a helical-scan VTR in which a magnetic tape unreeled from a supply (S) reel of a video cassette tape is wound around a tape guide drum with a rotary head by a tape winding means, guided by the tape guide drum, transported by a capstan, guided by various tape guides, and wound around a takeup (T) reel of the video cassette tape. Such a helical-scan VTR displays a code representing a fault on its display unit, as follows:
When the magnetic tape is subjected to a fault while it is being transported, it causes a malfunction with respect to the rotational speed or motor drive current of any of motors for actuating the tape winding means, the tape guide drum, the capstan, the supply reel, and the takeup reel. When such a malfunction is detected, the VTR deenergizes all the motors, and displays a code representing the malfunction on the display code.
The serviceman can recognize the status or pattern of the malfunction represented by the displayed code by referring to a code book. Therefore, the time required for the serviceman to adjust or repair the VTR is shorter than if he used only a service manual, and the adjusted or repaired condition is prevented from varying from serviceman to serviceman.
The process of displaying on the display unit a code representing a malfunction that has occurred to an electronic device, and determining the malfunction represented by the code with the code book referred to by the serviceman, however, is problematic as follows:
Firs
REFERENCES:
patent: 5467355 (1995-11-01), Umeda et al.
patent: 5469563 (1995-11-01), Morita
patent: 5521842 (1996-05-01), Yamada
patent: 5522035 (1996-05-01), Yamanishi
patent: 5553488 (1996-09-01), Ishii et al.
patent: 5557558 (1996-09-01), Daito
Mukai Masataka
Ohkuwa Kazuki
Beausoliel Robert W.
Frommer William S.
Iqbal Nadeem
Sony Corporation
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