Dynamic magnetic information storage or retrieval – Miscellaneous
Patent
1990-03-06
1991-10-01
Wolff, John H.
Dynamic magnetic information storage or retrieval
Miscellaneous
360132, G11B 2302, G11B 541
Patent
active
050539060
ABSTRACT:
A service jig for enabling technicians to more efficiently and easily inspect and repair VHS conventional video cassette recorders in need of service. The jig or service cassette, as it is sometimes called, is an E-shaped structure that, when inserted into a conventional VCR, simulates the presence of a conventional VHS tape cassette, thus allowing a service technician to put the VCR into any one of its normal operating modes and observe the operation of mechanisms internal to the recorder that are normally obscured by a regular cassette. The service jig is of a substantially open design which allows almost completely free access to the tape loop area of the tape handling system of the VCR. The central horizontal arm of the E-shaped structure safely actuates the top "cassette inserted" switch found a number of VCR models. The two horizontal end arms of the E-shaped structure block the light beam used in a number of VCRs to check for the presence of magnetic recording tape, so that such VCR units can be placed into play or record mode when the service jig is inserted within it in operating position. Two different mechanisms are also disclosed and used as part of the service jig for simulating the opening of the tape cover door of a conventional VHS cassette in a manner compatible with newer VCR models.
REFERENCES:
patent: 4224649 (1980-09-01), Alexandrovich
patent: 4602300 (1986-07-01), Ogata et al.
patent: 4655057 (1987-04-01), Derman
patent: 4674000 (1987-06-01), Lee
patent: 4803583 (1989-02-01), Bogdanski
Electronic Warehouse 1989 Christmas Catalog (Copyright 1989), pp. 1,2,3, and 7.
Fisher ER-7(B) Series Mechanical Manual for Videocassette Recorder, Reference No. WM-21380, pp. 1-17 (Sep. 1987).
Evans Jefferson
Wolff John H.
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