Malfunction communicating device for optical unit of laser print

Details Malfunction communicating device for optical unit of laser print Malfunction communicating device for optical unit of laser print

1988-02-16

1989-07-04

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340557, 340825760, 346 76L, 369 53, G08B 2300, H04Q 910, G11B 2700

Patent

active

048454834

ABSTRACT:
A device for detecting and communicating the occurrence of malfunctions occurring in an optical unit of a laser printer or the like wherein the number of terminals needed for communicating multiple malfunction-indicating signals is reduced to one. Various malfunctions are indicated by signals of respective different frequencies. The pulse width of the single signal thus composed is detected to determine in an external processor the type of malfunction.

REFERENCES:
patent: 3657707 (1972-04-01), Mc Farland et al.
patent: 4669072 (1987-05-01), Miura et al.
patent: 4725854 (1988-02-01), Ohtsuka et al.
patent: 4750163 (1988-06-01), Yamamiya et al.

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