SATO S84ex Operator's Manual page 261

7
Press the buttons to change ADJUST
/
LEVEL until the I-MARK(R) value is 1.0 V
or lower.
The adjustment range of ADJUST LEVEL is from 0
to 127.
Note
The ADJUST LEVEL manipulates the potentiometer
which will be, therefore, reset to 90, the default value
when replacing the PCB or initializing the settings.
8
Take a note of the I-MARK(R) value from the above procedure. This is the "Low" level
value for the I-mark sensor.
Next, check the "High" level (voltage) of the I-mark sensor.
9
Unlock the media feed and media sensor
assembly .
10
Physically place the I-mark media  again,
so that the media sensor can sense the
I-mark.
11
Press the media feed and media sensor
assembly  down to lock it.
To get the correct adjustment result, close the
media sensor assembly before performing the
adjustment.
12
Check the new I-MARK(R) value. This is
the "High" level value for the I-mark sensor.
If the difference between the "High" and the "Low"
level values is 1.0 V or more, then the adjustment
has satisfied the criteria.
If the difference between the "High" and the "Low"
level values is less than 1.0 V, repeat the procedure
from steps 4 through 12.
Criteria for Adjustment:
Low level (portion without I-mark):
High level (I-mark position) - Low level:
6 Cleaning and Performing Printer Adjustments
1
2
≤ +1.0 V
≥ +1.0 V
S84-ex/S86-ex Operator Manual
Low level: ≤ +1.0V
I-mark sensor
High level
259