NCR 7156, Руководство по эксплуатации и устранению неисправностей

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Chapter 1: 7156 MICR Operation
MICR (Magnetic Ink Character Recognition) is a feature of the 7156
printer which transforms the slight magnetic properties of specially
printed MICR characters into electrical voltage patterns. These
patterns, unique for each of the fourteen different MICR character
definitions, are translated into an electronic data image by a decoding
program residing in the printer controller. This data image is sent from
the printer to the host system in an ASCII format for transaction
processing.
The 7156 MICR is very stable and can run for the life of the printer
without readjustment of the factory settings. However, you may
encounter problems due to electromagnetic interference or changes in
the printer mechanism. If you do encounter a problem, use this guide
to help you identify the cause and the solution.
Note: A document read error of approximately 1 in 100 read attempts
during normal MICR operation is not considered to be a problem.
MICR Setup and Read Test
This section outlines the basic process for setting up and testing MICR.
1. Install printer.
Assemble the system components, placing the printer in its normal
user location. Leave at least 1 inch between the printer and any
CRT-type display.
2. Connect the power and communication cables. (Be sure both the
printer and the host are turned off.)
Some models of the 7156 printer receive power from a separate,
remote power supply; other models are powered from the host
system through the communication cable.
3. Select the MICR test document.