Axiohm 7156 Especificaciones descargar pdf (Pagina 20)

12 Chapter 2: Troubleshooting

Degraded Buck Coil Connections

Set the printer for the MICR adjustment and print out a few readings.

For more information, see “In-Place MICR Adjustment” on page 20.

Work the buck coil connections by reaching in to the harness terminals

with needle-nose pliers and working each wire back and forth about

an eighth of an inch. The wires and connectors are shown in the

illustration above. Close the cover, if open, and print out a few more

readings without touching the MICR adjustment pots. If the results

differ from the previous readings by more than two letters, replace the

buck coil and its harness. Cleaning the contacts in addition to this

connection agitation exercise may restore proper operation as a

temporary measure.

Faulty Amplifier, Read head, or Buck Coil

Unplug the read head and the buck coil from the PC board.

Reassemble the printer and run the MICR read test.

• If the test result is “NO MICR CHARACTERS,” either the read

head or the buck coil is faulty. Check the following resistance

measurements:

• Read head, line-to-line: 460 plus or minus 50 Ohms.

• Buck coil, line-to-line: 5 plus or minus 1 Ohms.

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Axiohm 7156 Especificaciones Pagina 20