System for determining a characteristic of an image forming unit

Details System for determining a characteristic of an image forming unit System for determining a characteristic of an image forming unit

1998-11-10

2000-08-15

Beatty, Robert

Electrophotography

Diagnostics

Unit or part identification

G03G 1500

Patent

active

061048887

ABSTRACT:
A unit detector 100 includes a main circuit 72 in an image forming device and a complementary circuit 74 in a image forming unit detachably mounted in the image forming device. The complementary circuit 74 has a fuse RF and a first resistor R1, connected in parallel to each other. The main circuit 72 includes a power supply 78, a first circuit portion 82 having a second resistor R2 which is connected through the complementary circuit 74 to the power supply 78 when the unit is properly mounted in the image forming device, and a second circuit portion 84 connected in parallel with the second resistor R2 and having third resistor R4 and switch Tr connected in serial with the resistor R4. The main circuit 72 further includes a detector 88 for detecting a voltage or a current at a portion of the first circuit portion 82. Also mounted in the main circuit 72 is a fusing circuit portion element for closing the switch for a predetermined time for blowing the fuse when it is determined that the fuse has not been blown from the voltage or current detected by the detector 88.

REFERENCES:
patent: 5021828 (1991-06-01), Yamaguchi et al.
patent: 5043764 (1991-08-01), Arnold et al.
patent: 5214481 (1993-05-01), Hoover
patent: 5699091 (1997-12-01), Bullock et al.
patent: 5710956 (1998-01-01), Kurohata et al.
patent: 5835817 (1998-11-01), Bullock et al.

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