Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1995-06-21
1996-12-31
Strecker, Gerard R.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324210, 324763, 324764, 369 53, G01R 3102, G01R 31302
Patent
active
055897770
ABSTRACT:
A preamplifier circuit for a computer data storage system disk drive read/write head (or HSA) includes multiple test modes to enable electrical testing of the preamplifier, the read/write heads, and associated circuitry without physically probing the components or circuitry. Communication between the preamplifier and a host controller provides for test mode selection and test mode enablement within the preamplifier. Testing occurs using only the normal interface connector to the head disk assembly (HDA) in which the preamplifier and HSA are embodied. Properties such as electrical resistance, ESD, preamplifier bond wire connection integrity, head bond wire and solder joint integrity, and connections from the head slider to the preamplifier leads are all tested. Testing occurs without probing to provide efficient, reliable, and cost effective manufacturing and testing benefits of the read/write heads, flex assembly, HSA, and HDA.
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Davis Bradley K.
Gamand Patrice
Ramalho Joao N. V. L.
Voorman Johannes O.
Hewlett--Packard Company
Philips Electronics N.V.
Simmons Lane R.
Strecker Gerard R.
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