SATO CL 408e - Manual (Page 85)

Page 4-11
Section 4. Electric Checks and Adjustments
SATO CL408e/CL412e Service Manual PN 9001078
Rev. B
4.7 Eye-Mark Adjustment
Additional equipment required: TP Test Module
Digital Multimeter
STEP PROCEDURE
Refer to Section 4.2 for access to main PCB
1.Turn VR5 (IM) potentiometer on the main PCB all the way to the left.
2.Refer to Section 4. 3.
Set the digital multimeter to DC voltage measurement mode.
Attach the connector from the TP Test Module to the test port on the
main PCB. Note correct positioning of connector. Nibs on the connector
are placed down in the receptacle on the PCB in the forward position.
Set the dial to 4.
3.Connect (+) probe of the multimeter to Sig+ and (-) probe to pin
GND.
4.For Low level (no "Eye-Mark" part) adjustment, put paper part in the
sensor. Then adjust the electrical level with VR5 on the main PCB so
that it will measure less than 0.5 V.
5.For High level ("Eye-Mark" part) adjustment, put paper part with the
"Eye-Mark" part in the sensor and check the electrical level. If the level
difference is +1.0 V more than the Low level, it is acceptable. If not,
return to STEP 4 and readjust VR5.
6.Standard values: Low level (no "Eye-Mark" part): +0. 5 V or less.
High level ("Eye-Mark"): Low level +1.0 V or
higher. If these values do not result, try the
following:
a) Repeat the process
b) Clean the sensor
c) Verify sensor is operational
d) Replace labels with higher quality labels
e) Perform factory reset