Tweco 300 MST Arcmaster - Manual (Page 53)

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10.03 Switching VRD ON/OFF
Switch the machine OFF.
a) Remove the clear plastic cover from the control panel. (see Figure 12)
• 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 12 . VRD ON/OFF Step A
b) Remove four mounting screws from the control panel. (see Figure 13)
c) Access the VRD control by gently prying back the front panel controls to reveal
the VRD ON/OFF potentiometer. (see Figure 13)
CAUTION 4
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 13. VRD ON/OFF Step B,C