NCR 7156, Руководство по эксплуатации и устранению неисправностей

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14 Chapter 2: Troubleshooting
J17A MICR
Buckhead
J17B MICR
Readhead
•
If the test result is not “NO MICR CHARACTERS,” either the
amplifier board or the control board is faulty. In single-board
printers, the board is a combination amplifier/control board. For
dual-board printers the MICR amplifier is a separate board behind
the cantilever. (The problem may be the interconnect harness
between the two boards in the dual-board system; check to confirm
that the harness is properly plugged in.) Replace the board
containing the MICR amplifier. For more information, see the 7156
Service Guide. Reassemble the printer and perform the MICR
adjustment. Then repeat the MICR read test. For more information
on adjusting the MICR, see “In-Place MICR Adjustment” on page
20.
Read head Contact and Movement: Mechanical Problems
An unacceptable MICR read rate; failure rate is greater than 1%; or a
catastrophic read problem such as “NO MICR CHARACTERS” or
mostly garbage may indicate faulty read head movement or a lack of