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Driver/ Head Fault Isolation Technique

IP.com Disclosure Number: IPCOM000048686D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Bailey, JA: AUTHOR

Abstract

Previous circuits used to detect faults in magnetic recording write driver and write head circuitry were unable to isolate the fault to the driver or head. The circuit described here in connection with Figs. 1 and 2 is capable of isolating such faults. Moreover, the required bandwidth of the checking circuit is significantly reduced below previous circuit requirements.

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Driver/ Head Fault Isolation Technique

Previous circuits used to detect faults in magnetic recording write driver and write head circuitry were unable to isolate the fault to the driver or head. The circuit described here in connection with Figs. 1 and 2 is capable of isolating such faults. Moreover, the required bandwidth of the checking circuit is significantly reduced below previous circuit requirements.

When track (TK) 1 is driven in either direction, both A1 and B1 should rise, setting both S/R flip-flops; when track (TK) 2 is driven in either direction, both A2 and B2 should rise, resetting both flip-flops. If a head is open, one of the flip- flops will not change state. If a driver is open or shorted, neither flip-flop will change state. If no fault exists, both flip-flops will change state.

Consequently, the circuit allows reliable detection and isolation of faults in the write-head driver and the write head itself.

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