JUKI KE-3010 Maintenance Manual page 117

<Adjusting the offset and sensitivity of the point sensor>
1) Before starting the adjustment, set the sensitivity change-over switch to "NORM" and the
response time change-over switch to "FAST".
2) Connect "+" and "-" of the voltmeter to the check terminals TE27 and GND on the S-HEAD
MAIN PCB ASM, respectively.
3) Set the span adjustment controller of the sensor amplifier to "MAX" and the offset adjustment
controller to "MIN".
4) Interrupt the light between the light emitting and receiving parts of the fiber unit completely.
(At this time, do not use any light transmission material, such as paper sheets.)
5) While carefully observing the voltmeter, gradually turn the offset adjustment controller toward
"MAX" to adjust the voltage value to "1V±0.01V".
6) Then put the status between the light emitting and receiving parts to the light receiving one.
7) While carefully observing the voltmeter, gradually turn the span adjustment controller toward
"MIN" to adjust the voltage value to "5V±0.01V".
8) When the status is put in the light interrupt status again, check that the voltmeter shows
"1V±0.01V". When the status is put in the light receiving status, check that the voltmeter
shows "5V±0.01V". If the voltmeter value is beyond the set range, make the fine adjustment
of the offset adjustment controller and span adjustment controller so that the voltmeter value
is within the set value range.
Output saturation
indicator (Red)
Note) If the voltage is not increased to "5V" even though the controller is turned fully, the light
axis between the light emitting and receiving parts may deviate. At this time, while
observing the voltmeter, adjust the light axis again to a position where the voltage is
increased to the maximum level.
Maintenance Guide
Output indicator
(Green)
Span adjustment (sensitivity adjustment)
controller (3 rotations)
Sensitivity change-over switch
Response time change-over switch
Offset adjustment controller
2-13
Rev. 2.0