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3.5.11
Ink ribbon feed
Checking the ribbon feed
Checking the printhead mounting
3.5.12
Special functions
9710
If the ink ribbon becomes loose or twisted or is subject to excessive mechanical wear, this
can be caused by an incorrectly mounted or adjusted printhead or print bar.
1.
Install a new ink ribbon cassette.
2.
Switch ON the printer and be prepared to switch it OFF when the printhead is in the mid
position of the document station printbar during the power-ON calibration.
3.
Switch OFF the printer.
4.
Remove the front cover.
5.
Remove the top cover since you need to be able to see the printhead nose from the
rear of the printer.
6.
Push the carriage left and right several times, but not so far aside that the position of
the slide changes. Check, while moving the head, that the ink ribbon does not slacken
or become twisted or folded in front of the nose. If so, check the printhead mounting as
described below.
1.
Remove the ink ribbon cassette.
2.
Press the slide to its right position.
3.
Check that the printhead nose is parallel with the printbar. To check this, look through
the hole in the left side plate where the printbar is fitted. Place a light source on the
other side of the printhead.
4.
If the nose and the printbar are not parallel, exchange the printhead.
70.
SETTING OF OPTO
Function 70 registers the output voltage level of each opto-sensor in its WHITE or OPEN
state, that is, while no document or metal flag interrupts the light beam. The voltage levels
are then multiplied by factors that give the calibrated threshold level values. These values
are only to be used as a reference to observe the deterioration of the sensors. The firmware
never uses these values.
The sensor output levels are also read every time the printer is switched ON. The threshold
level values are calculated in the same way, but this information is stored in another
location in RAM. The power ON values are used during normal operation.
The threshold values set by function 70 and the values from the latest power ON, are
printed on the CONFIGURATION & CALIBRATION SUMMARY produced using function 2.
By comparing the values, any sensor deterioration that has occurred since the last time
function 70 was run can be detected.
The reference values, set by the factory using function 70, must not be changed unless one
of the following conditions exists:
•
a cold start has been performed
•
the main board has been exchanged
LB12/LB15 Field Support Manual
-
SENSOR REFERENCE THRESHOLD LEVELS
3-33
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