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Tweco 300 MST Arcmaster User Manual

Page 54

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d) Turning the VRD ON/OFF. (see Figure 14)

• To turn VRD ON: rotate the trim potentiometer (VR1) on the display PCB fully clockwise.

When VRD is turned ON check that it operates as per VRD Specifications on page 46.

• To turn VRD OFF: rotate the trim potentiometer (VR1) on the display PCB fully

counter-clockwise.

WARNING 10

The VRD ON/OFF trim potentiometer MUST ONLY be positioned fully clockwise OR fully counter
clockwise as the VRD function will be unknown for every other position.

Figure 14.

VRD ON/OFF Step D