Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1994-09-01
1995-08-01
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324656, 369 55, G01R 3106
Patent
active
054382734
ABSTRACT:
A system for testing a voice coil member of a rotary actuator head stack assembly (HSA) of a disk drive includes a plurality of testing circuits, each of which selectively performs at least one predefined test on the voice coil member. During testing, the head stack assembly is removably mounted on a base plate with the axis of rotation of the head stack assembly normal to the top surface of said base plate. A flat reference coil is disposed in a fixed position parallel to the top surface of the base plate to provide an inductively coupled relationship between the reference coil and the coil under test. The ends of the coil under test are connected to a pair of terminals in the base plate. A polarity test circuit for determining the polarity of the coil under test is connected to the terminals. Other test circuits are selectively connected to the terminals and the tests are conducted in a controlled sequence without the need to move the fragile head stack assembly.
REFERENCES:
patent: 3869664 (1975-03-01), Safer
patent: 5036285 (1991-07-01), Shaw
Buttar Jagdeep S.
Gergel Oleg A.
Mahmoudian Mostafa
Motiska Neil
Kallman Nathan N.
Read-Rite Corporation
Wieder Kenneth A.
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