NCR 7156, Руководство по эксплуатации и устранению неисправностей

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Chapter 2: Troubleshooting 7
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Reinsert the slip correctly so that the indicator LED turns on. Then
pull the slip straight to the left about 1/4 inch. The indicator LED
should turn off. (This tests the front LED slip-in sensor.)
Top of Printer
Front Led Sensor
(Blow Air Under
Wing to Clean)
Back Led Sensor
(Blow Air or Wipe Clean
w/ Soft Damp Cloth)
If the indicator LED does not respond correctly, remove the slip table
and open the front cover. Locate and clean the two slip-in sensors.
Blow air, use a soft damp cloth or cotton swab to remove all
accumulated dust and debris.
Repeat the steps above to test the sensors. If the results are still not
correct, replace the sensor that is not responding correctly.
Insert MICR Document
The MICR characters may not be magnetized properly. This type of
error is indicated by MICR read errors that are mostly “?” or garbage.
The misreads may be caused by either of the following.