NCR 7156, Руководство по эксплуатации и устранению неисправностей

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8 Chapter 2: Troubleshooting
Document Inserted Incorrectly
Verify that the document is being inserted correctly with the MICR
characters face down. See the illustration on page 3.
Missing Platen Magnet
MICR characters are magnetized as the document feeds into the
printer by a magnet mounted in or on the platen. Open the front cover
and pass an iron object, such as a steel screwdriver blade, just above
the right end of the platen. You should notice a strong tug from the
magnet.
If the magnet is missing replace the platen. Repeat the MICR read test.
For more information on replacing the platen, see the 7156 Service
Guide.
Incorrect Printer Installation, Electrical Grounding or Bonding,
or MICR Adjustment
Difficulty in attaining “OK” during the MICR adjustment; an
unacceptable MICR read rate (a failure rate greater than 1%); or a
catastrophic read problem such as “NO MICR CHARACTERS” or
mostly garbage may indicate electrically induced problems. This type
of problem may be caused by an oversight in the initial setup, poor
electrical grounding and bonding, or electrical interference.
Check the following to determine the cause of the problem.
CRT Monitor Interference
If the host terminal includes a CRT monitor, turn off the monitor and
repeat the MICR read test. If the monitor cannot be independently
turned off, move the monitor as far as possible away from the printer
for this test.
If the MICR read test result is now acceptable, the CRT monitor was
too close to the printer. There must be at least 1 inch of space between
any CRT device and the printer.
Try new monitor positions that will be acceptable to the user and that
will provide acceptable MICR read results. Two position options that
will reduce MICR read errors are increased spacing between the