Richard Allen Wirkkanen

US Patent:

40018180, Jan 4, 1977

Filed:

Oct 22, 1975

Appl. No.:

5/624610

Inventors:

Frank Radichel - Thornton CO
Richard Wirkkanen - Broomfield CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G08B 2100

US Classification:

340415

Abstract:

A device for detecting the existence and location of failures on circuit boards is disclosed. The device is specially adapted for use with boards having a number of serially connected digital loops. Digital circuitry is provided which simultaneously compares a number of checkpoints on the faulty board with corresponding points on a known good board, and the first point to fail is isolated. Inhibit circuitry prevents failure indications at checkpoints if those failures occur subsequent to the first failure.