SATO 9001226(A) Service Manual page 153

6.9 ADJUSTING AND CHECKING SENSORS (Cont'd)
Relocate the media so that the I-Mark is oriented over the sensor directly.
5.
Note:
To stabilize the sensor level, make sure the print head assembly is locked and the media is threaded cor-
rectly.
Check the sensor level and make sure the difference between the low level (without I-Mark) and the high
6.
level (I-Mark portion) is +0.9V or more. If the level difference is less than + 0.9V, retry step 3 and 4 , and
adjust VR5 to set the level difference to a maximum value.
Table of normal performance values:
Low level (without I-mark):
High level (I-mark position) - Low level (without I-mark):
Press the / arrow buttons to switch to SLICE LEVEL adjustment screen. Press the
7.
to adjust the slice level.
Setting the slice level to 0.0V enables automatic setting. Set slice level to the result of (High Voltage Level
+ Low Voltage Level) / 2. Individual results may vary.
The slice level can be set within the range of 0.0V to 3.2V . Save changes by pressing the FEED button.
If having difficulties adjusting the sensor level properly, clean the sensor portion and check the connector
8.
connection. If the problem persists, replace the sensor.
6.9.2 Gap/ Center hole Sensor Sensitivity Adjustment
This sensor adjustment regulates penetrating ability for media referencing. Penetration modification is
performed via a potentiometer that is part of the potentiometer complex integrated to the main circuit board.
To establish penetration levels, upper and lower voltage levels must be set and the difference between the
two voltage levels should be maximized for optimum performance.
For proper performance, the sensor must have a voltage difference greater than +1.0V between high and low.
If performing the following procedure does not result in acceptable voltage levels, clean the window over the
sensor's eye. If this fails, the sensor or circuit board may require replacement.
These adjustment activities can be simply done in SERVICE MODE with the voltage measurement shown on
the LCD screen of the printer. The voltage measurement can also be taken from CHK connector with the use
of a multimeter.
To calibrate the Gap/ Center hole sensor level with the Operator Panel
Note: This calibration is only for fine tuning. The adjustment may not have any significant value changes,
depending on the media used. In this case, adjust the sensor level by the VR potentiometer on the Main PCB
(CONT) .
Enter to SENSOR LEVEL setting screen with GAP/CH selected.
1.
TG3 Series Service Manual
Section 6: Checks and Adjustment Procedures
+0.5V or below
+0.9V or above
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