NCR 7156, Руководство по эксплуатации и устранению неисправностей

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Chapter 2: Troubleshooting 15
continuous, square contact between the document and the MICR read
head.
Check the following to determine the cause of the problem.
Faulty MICR Solenoid
Set the printer DIP switches for MICR adjustment as shown below.
(Record the present DIP switch settings first.)
Switch 1 2 3 4 5 6 7 8
ON OFF OFF OFF OFF OFF ON Don’t
Care
Press the reset button or press the Online button off and then on again
to enable the new settings.
Open the front cover and move the print head carriage to the left. The
read head should be resting flush with the slip guide surface. Press
and release the Paper Feed button while watching the MICR read
head; As you actuate the feed button, the read head should snap up
and down.
If the read head doesn’t move, it indicates that either the read head
mechanism is jammed or the MICR solenoid has failed. Do the
following:
•
Tear down the printer to determine if the read head mechanism is
jammed. For more information, see the 7156 Service Guide.
•
If you don’t find a jam in the read head mechanism, then the MICR
solenoid has failed. Replace the MICR bracket assembly, rebuild
the printer and perform the MICR adjustment. Then repeat the
MICR read test. For more information on replacing the MICR
bracket assembly, see the 7156 Service Guide. For more information
on adjusting the MICR, see “In-Place MICR Adjustment” on page
20.
If the read head snaps up and down, continue checking the following.