Printed circuit card test unit

Claim 2

A portable test assembly for checking the function of any one of a plurality of different printed circuit cards, each such card including individual components which may malfunction, and each such card having a common type of edge connector presenting a selected number of connector terminals, said test assembly comprising: an edge connector having a plurality of test terminals adapted to receive the type of edge connector common to the cards; a plurality of wander lead terminals connected to certain of said test terminals; a plurality of manually operable bistable and monostable switches having wander lead sockets connected thereto; power supply terminals for connection to a suitable power supply for providing selected voltage levels which correspond to operating levels of at least one of the components of the cards, each of said power sUpply terminals being connected to certain ones of said switches; a plurality of wander leads for connecting pairs of said wander lead terminals and said wander lead sockets so as selectively to provide said selected voltage levels at corresponding test terminals in response to actuation of certain of said switches; and indicating means for selectively indicating, in response to selective actuation of said switches to supply individual components of a card being tested with the requisite operating voltage level, if each of such individual components is functioning correctly.

Claim 3

A portable test assembly as defined in claim 1 including resistance elements connecting one of said power supply terminals which supplies voltage at one level to certain of said wander lead sockets, which certain wander lead sockets are associated with switches having connection to another power supply terminal of lower voltage level.

Claim 4

A portable test assembly according to claim 1, in which said printed circuit cards are each provided with pin edge connectors, and said test assembly is provided with corresponding socket edge connectors.

Claim 5

A portable test assembly according to claim 1 including a wander lead socket for connection to a test probe, said socket being connected to a circuit including an indicator lamp and a power supply terminal, said test probe and said indicator lamp being provided for determining whether a signal is present on a terminal of each of said individual components.

Claim 6

A portable test assembly according to claim 4, in which said test probe socket is connected to said indicator lamp via a transistor circuit.

Claim 7

A portable test assembly according to claim 5, in which said means for selectively indicating the correct function of each said individual components comprises a plurality of neon and filamentary lamps.

Claim 8

For use in combination with a set of printed circuit cards each having an edge connector presenting a selected number of a common set of connector terminals and each having a number of circuit components and associated circuitry connected between said selected number of connector terminals; said set of circuit cards having outputs appearing at a certain pair of said connector terminals, a number of inputs responsive to logical ''''zero'''' and logical ''''one'''' voltages at a first number of said connector terminals and a number of inputs responsive to a further voltage and the absence thereof at a further number of connector terminals to produce a logical ''''one'''' and a logical ''''zero'''' selectively within the circuits, a test assembly for use with any one of said circuit cards comprising; an edge connector having a set of test terminals corresponding to and engagable with said common set of connector terminals; power supply means for providing said logical ''''zero,'''' said logical ''''one'''' and said further voltages; a pair of indicator devices connected respectively to those test terminals corresponding to said certain pair of connector terminals; a first set of wander leads connected to those test terminals corresponding to said first number and said further number of connector terminals said wander leads each having at the free ends thereof a wander plug; a set of wander lead sockets each adpated to receive one of said wander plugs a plurality of manually operable monostable switches and a plurality of manually operable bistable switches connecting said logical ''''zero'''' and said logical ''''one'''' voltages selectively to certain of said set of wander lead sockets and a plurality of manually operable monostable switches and a plurality of manually operable bistable switches connecting said further voltage selectively to others of said set of wander lead sockets, whereby discrete programs of wander lead connections made by inserting selected wander plugs into selected wander lead sockets and corresponding programs of switch actuations are effective to indicate proper operatiOn of all of the individual components and associated circuitry of each of said circuitry cards by effecting energization of said indicator devices.

Claim 9

For use in combination with a set of printed circuit cards each having an edge connector presenting a selected number of a common set of connector terminals and each having a number of circuit components and associated circuitry connected between said selected number of connector terminals; said set of circuit cards having outputs appearing at a certain pair of said connector terminals, a number of inputs responsive to logical ''''zero'''' and logical ''''one'''' voltages at a first number of said connector terminals and a number of inputs responsive to a further voltage and the absence thereof at a further number of connector terminals to produce a logical ''''one'''' and a logical ''''zero'''' selectively within the circuits, a test assembly for use with any one of said circuit cards comprising; an edge connector having a set of test terminals corresponding to and engagable with said common set of connector terminals; power supply means for providing said logical ''''zero,'''' said logical ''''one'''' and said further voltages; a pair of indicator devices connected respectively to those test terminals corresponding to said certain pair of connector terminals; a first set of wander leads connected to those test terminals corresponding to said first number and said further number of connector terminals said wander leads each having at the free ends thereof a wander plug; a set of wander lead sockets each adpated to receive one of said wander plugs a plurality of manually operable monostable switches and a plurality of manually operable bistable switches connecting said logical ''''zero'''' and said logical ''''one'''' voltages selectively to certain of said set of wander lead sockets and a plurality of manually operable monostable switches and a plurality of manually operable bistable switches connecting said further voltage selectively to others of said set of wander lead sockets, whereby discrete programs of wander lead connections made by inserting selected wander plugs into selected wander lead sockets and corresponding programs of switch actuations are effective to indicate proper operatiOn of all of the individual components and associated circuitry of each of said circuitry cards by effecting energization of said indicator devices.

Claim 10

For use in the combination as defined in claim 7 wherein said test assembly also includes a further indicating device and a transistor switch, responsive to logical ''''one'''' voltage input, connected between said further voltage and ground potential and having an input connected to a wander lead socket of said set thereof.