Checking And Adjusting The Micr Check Reader (Common Board And Rs-232C Models) - NCR 7156 Service Manual

7156 Service Guide

Checking and Adjusting the MICR Check Reader (Common Board and RS-232C Models)

The adjustment described in this section cancels or sharply reduces extraneous signals
picked up by the Magnetic Ink Character Recognition (MICR) check reader. Use these
procedures on newer LCSIO (RS-485) models with the common PC board and on all RS-
232C models (older RS-232C boards and newer common PC boards).
Older LCSIO (RS-485) models have a MICR amplifier board that requires different
procedures for checking and adjusting. See the next section., "Checking and Adjusting the
MICR Check Reader (LCSIO—RS-485 MICR Amplifier Board)."
Note: The MICR check reader feature has been factory adjusted for a normal operating
environment with a host computer. However, additional devices, such as CRT monitors or
large metal surfaces near the printer, can affect the printer's magnetic field, causing
intermittent reading errors when the MICR check reader is in operation.
This condition can be easily diagnosed by checking the MICR check reader adjustment and
readjusting it if the factory setting has been altered. Follow the procedures in this section to
check and adjust the MICR check reader.
Check the MICR Check Reader Adjustment
Caution: Electro Static Discharge may damage the PC board. Wear a grounded wrist strap
and use a static mat or other ESD protected work surface whenever you work with the PC
board.
Note: The operator panel may differ depending on the model. To put the printer on- or
off-line, use a paper clip or other pointed object to depress the plunger (in place of the On
Line button) on models with that item.
1.
2.
3.
Caution: The DIP switches are pre-set at the factory and should generally not be changed.
If you must change them, do so carefully to avoid changing other functions.
4.
Switch 8: On = knife, Off = non-knife
Switch 1
On
5.
6.
Open the front cover.
On models with the On Line button (or plunger), press the On Line button (or plunger)
to put the printer off-line.
On models without the On Line button (or plunger), press the reset button (under the
DIP switches).
Set the DIP switches to the settings in the table.
Switch 2 Switch 3
Off Off
Close the front cover and press the On Line button (or plunger) on those models.
The green LED flashes when the printer cycles. The settings are entered into EEROM.
On models without the On Line button (or plunger), press the reset button (under the
DIP switches).
The green LED flashes when the printer cycles. The settings are entered into EEROM.
Switch 4 Switch 5 Switch 6
Off Off Off
September 1998
Chapter 3: Diagnostics
Switch 7
On
27