iSys V12 Thermal Printer - Manual (Page 32)

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Replacing the gears
1. Remove the left side panel as described in this chapter.
2. Remove the drive belt as described in this chapter.
3. Loosen the two set screws on the gear to be replaced-Figure 7-13.
4. Replace the gear and belt, and slide the motor assembly fully rearwards to tension belt.
Tighten the three motor assembly mounting screws.
NOTE: When replacing the gear set screws, ensure that one screw is seated on the flat side of
the shaft.
5. Ensure there is no more than 1/8-inch of “play” on the belt. Ensure that the belt is seated in
the centre of the gears, and does not wander from side to side when the gears are turned.
Replacing the stepper motor
1. Remove the bottom panel as described in this chapter.
2. Remove the left side panel as described in this chapter.
3. Open the rear panel to gain access to the main logic board as described in this chapter.
Disconnect the stepper motor cable from its header on the main board. See Figure 7-14.
4. Remove the stepper motor cable from the two p-straps shown in Figure 7-14.
5. Remove the drive belt and gears as described in this chapter.
6. Remove the three motor assembly mounting screws-Figure 7-12. Remove the motor
assembly.
7. Remove the four screws securing the motor plate to the motor-Figure 7-15. Install
replacement motor re-using screws.
8. Replace the motor and reverse steps to reassemble. Note the position of the motor as shown
in Figure 7-16.
Replacing the platen roller and bearings
1. Remove the left side panel as described in this chapter.
2. Remove the drive belt and roller gear as described in this chapter. You do not need to
remove the motor gear.
3. Remove the two bearing screws shown in Figure 7-15.
4. Pull the roller to the left so that the right bearing is unseated. The wave washer on the right
end of the roller shaft- Figure 7-17 may come loose. Retain for reinstallation.
5. Remove the left bearing from the roller shaft.
6. Remove the roller by pulling it upwards and out to the right. Remove the right bearing from
either the roller shaft or from its seat.
7. Replace the roller or bearings and reverse steps to reassemble. If one bearing is faulty,
replace both.
CAUTION: Do not adjust the power supply higher than 5.1 V. This may damage the plotter.
Measuring and adjusting 5 V power supply voltage
1. Open the right side panel as described in this chapter.
2. With the voltmeter attached to the +5 volt (red wire) and ground (black wire) terminals of the
supply, adjust the 5 V potentiometer shown in Figure 7-18.
3. Replace the side panel.