Method of diagnosing operating conditions of an image processor

Details Method of diagnosing operating conditions of an image processor Method of diagnosing operating conditions of an image processor

1990-10-10

1992-12-29

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

375 8, 375 10, H04N 1417

Patent

active

051756331

ABSTRACT:
A method of diagnosing the operating conditions of an image processor comprising the steps of preparing a first pattern of data, a second pattern corresponding to the first pattern when it has been compressed normally, a third pattern of data, and a fourth pattern corresponding to the third pattern when it has been expanded normally; diagnosing an operating condition of the compressor by comparing data after the first pattern has been compressed by the compressor with the second pattern; and diagnosing an operating condition of the expander by comparing data obtained after the third pattern has been expanded by the expander with the fourth pattern. The independent diagnosis of the compressor and the expander allows the specific defective chip of component to be identified, thereby facilitating proper repair.

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