iSys V12 Thermal Printer - Manual (Page 31)

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Adjusting the printhead
This adjustment should only be required after head replacement, and should not be done until
after a sample plot has been created.
1. Remove the top cover as described in this chapter.
2. Loosen but do not remove the 6 screws located on the head plate. These screws can be
accessed through the holes in the top spring backing plate (see Figure 7-11).
3. Use a 5/32” Allen key to adjust the head alignment to the platten roller, refer to Figure 7-37
Adjust only one side of the head at a time.
4. Output a sample plot to check after each adjustment, looking for the darkest and most
consistent image across the thermal printhead.
5. Repeat step 4 until the plotted image looks consistent from one end of the media to the other.
6. Tighten the six M3x16 head screws.
7. Install top lid cover. Run an internal test plot to check final alignment.
Replacing the printhead data cable
1. Open the plotter lid. Disconnect the data cable (on the left) from the back of the printhead-
Figure 7-33.
2. Open the back panel as described in this chapter. Disconnect the printhead connector from
the main board as shown in Figure 7-28.
3. Remove the lid plate screw that secures the p-strap on the data cable- Figure 7-33.
4. Remove the data cable by pulling the head connector through the chassis hole by side of the
24-volt power supply.
5. Replace the data cable and reverse steps to reassemble.
Replacing the drive belt
1. Remove the left side panel as described in this chapter.
2. Loosen the three motor assembly mounting screws shown in Figure 7-12. Slide the assembly
fully forward to create slack on the drive belt.
3. Roll the belt off of the top gear.
4. Replace the belt, and slide the motor assembly fully rearwards to tension belt, and tighten the
three motor assembly mounting screws.
5. Ensure there is no more than 1/8-inch of “play” on the belt. Ensure the belt is seated in the
centre of the gears, and does not wander from side to side when the gears are turned.
6. Reinstall the left side panel.