Open head detection circuit and method

Details Open head detection circuit and method Open head detection circuit and method

1990-06-28

1992-02-11

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324527, 324537, 324546, 324656, 324212, G01R 3108, G01R 3312

Patent

active

050878840

ABSTRACT:
An open head detection circuit for detecting an open-circuit condition in a magnetic head connected to head contacts. The detector circuit includes a threshold source which generates a threshold voltage that is between a head contact voltage representative of a connected head and a head contact voltage representative of an open head. A comparator, coupled to receive head voltage signals from the head contacts and coupled to the threshold source, compares the head voltage signals to the threshold voltage and generates comparator signals representative of the comparison. Sampling circuitry, coupled to the comparator and coupled to receive write data signals, samples the comparator signals after detection of the write data signals and before the write data signals affect the comparator signals.

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patent: 4754222 (1988-06-01), Felleisen et al.
patent: 4764729 (1988-08-01), Yakuwa et al.
patent: 4862078 (1989-08-01), Kawabata
patent: 4866376 (1989-09-01), Fujiki et al.

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