To Set The Input Threshold Voltage Level For I-Mark Sensor - SATO LC400e Series Operator's Manual

3.7 SERVICE MODE (Cont'd)

3.7.2 To Set the Input Threshold Voltage Level for I-mark Sensor

This procedure allows you to manually set the threshold voltage level of the I-mark sensor, between the
maximum and minimum light levels. The input threshold sets the minimum acceptable voltage level based on
overall sensor voltage levels. Once the overall sensor thresholds have been established, the input voltage
may be set.
Note
The input threshold is an average of the low and high voltages.
1. When SERVICE MODE appears on the LCD, press the FEED button.
Note
The next menu screen should display the sensor type selected and its relative threshold levels.
2.
Make sure the correct sensor is selected. EYE should be displayed on the screen.
3.
If EYE is not display, change the sensor type by altering DIP switch DSW2-2 (either software or hardware
DIP switch depending on DSW 2-8 setting).
4.
Physically position the media (portion without the I-mark) so that its rests over the I-mark sensor. To stabi-
lize the sensor level, make sure the print head assembly is latched and the media is threaded correctly
after setting the media.
5.
Record the voltage shown on the top line of the LCD panel. The voltage ranges measured should be
between 0.3 and 0.7 V. This is the low voltage value.
6.
Physically re-position the media so that the I-mark is oriented over the sensor directly.
7.
Observe the threshold level displayed on the LCD and the reading should have increased more than 1.2 V
to the last reading.
The voltage ranges measured should be within the following range:
Media only= 0.3 to 0.7 V
I-mark ≥ 1.2 V
+
Calculate the input threshold voltage using the formula.
(High Voltage Level + Low Voltage Level) x 0.5 = INPUT threshold voltage value
If the measured values are outside this range, you may have trouble in finding a value that will work prop-
erly under all conditions. If this is the case, a higher quality label may be needed to get adequate perfor-
mance.
8.
To set the input threshold, press the LINE button repeatedly until the calculated values displayed. The
maximum voltage can be set is 3.3 V.
If a value of 0.0 V is set, the printer will automatically set the level each time the printer is powered on with
labels loaded or the print head is closed.
9.
Once the setting is correct, pressing the FEED button will accept the setting and advance to the AUTO
ONLINE FEED display.
LC400e Series Operator Manual
EYE
INPUT
the low value
Section 3: Operation and Configuration
[ X.XV ]
I-mark sensor threshold
[ X.XV ]
INPUT threshold
Page 3-19