| 摘要 |
<p>There is described a simple and inexpensive circuit for a thermal printing system which provides various test and diagnostic image patterns. The circuit includes a dual-port RAM, an address counter, a handshake logic unit and a multiplex switch unit. The image patterns provided by this circuit, which are applied to the printing system at high speed and in real time (e.g., 10 m bits/sec.), visually verify the precise mechanical and electrical adjustment, normal operating performance, and the high quality print output of the overall printing system. Various test images are easily programmed off-line into this electronic circuit. This circuit, with its printed test images, provides a highly useful tool in the initial set-up and the subsequent maintaining of the operation of the printing system. <IMAGE></p> |
