Browse Prior Art Database

Diagnostic Routine For Printers

IP.com Disclosure Number: IPCOM000048829D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Long, T: AUTHOR [+3]

Abstract

In printers employing servo drive logic, and which utilize a microprocessor for controlling the carrier drive motor, it is essential that some means be provided for diagnosing the carrier drive so as to shorten repair times, when necessary.

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Diagnostic Routine For Printers

In printers employing servo drive logic, and which utilize a microprocessor for controlling the carrier drive motor, it is essential that some means be provided for diagnosing the carrier drive so as to shorten repair times, when necessary.

To this end, and referring first to Fig. 1, a typical servo drive logic board or card 10 is illustrated. The board is powered by a conventional power cable 11 and powers a microprocessor 12, in the illustrated instance, and for exemplary purposes only, an Intel 8048/8748 microprocessor. The master microprocessor (not shown) provides an input through an input control cable 13 which directs that various functions be carried out by the microprocessor 12 so as to effect proper motions of the carrier drive motor. (For example, see U.S. Patent 4,270,868.) In simplified form, the main microcode embedded in the 8048 examines the input control lines or cable 13 input to determine the function to perform. The function is illustrated in Fig. 2. When a valid input command is detected, various routines are called to complete the command.

Fig. 1 illustrates the use of a test switch 15 and one input control line 16 to add a switch selectable input to instruct the microcode to enter a self-test diagnostic routine. This is accomplished by disconnecting the normal input control line from the logic card to prevent the using system from interfering with the printer operation during diagnostic test. A diagnostic rou...