Tweco 300 TS Arcmaster(April2006) - Manual (Page 54)

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11.03 Switching VRD ON/OFF
Switch the machine OFF.
a) Remove the clear plastic cover from the control panel. (see Figure 11)
Lift up the cover so it rests on the top of the unit.
Place a small flat bladed screw driver between the cover hinge on the front panel.
Gently lift the cover hinge out of the front cover mounting hole.
Remove the control’s clear plastic cover.
Figure 11. VRD ON/OFF Step A
b) Remove four mounting screws from the control panel. (see Figure 12)
c) Access the VRD control by gently prying back the front panel controls to reveal
the VRD ON/OFF potentiometer. (see Figure 4)
CAUTION 6
Do not pull back the front panel with excessive force as this will unplug control PCB.
Plugging the control PCB back into the front panel controls can only be achieved by
removing the side covers.
Figure 12. VRD ON/OFF Step B,C