Independent Self-Test of Printer Bit-Image-Graphics Capability
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
A user can verify graphics performance of a printer independently of its host computer. This should lead to a reduction in service calls in which no trouble is found. When a user of a printer performs a self- test through activating certain keys, a special line appears in the output. This special line consists of four colons with each colon contained inside a small box and the four boxes being spaced equal distances from each other. If any colon lies outside of its box, the user will be instructed to have the printer serviced. The printer, which has forty electrodes arranged in a column, responds to six commands as described in U.S. Patent 4,467,363, with four being used to completely exercise the graphics ability of the printer.