Spectra LR20 - Laser Receiver Manual

Table of Contents

Contents

1 Functions
2 Bandwidth Selections
- 2.1 Center on-grade
- 2.2 On-grade location
3 Documents / Resources
- 3.1 References
- 3.2 Download manual

Functions

This document describes the functions of the Spectra Precision LR20 display receiver.

Power on/off – To turn on the receiver, press for one second. The on-grade light flashes intermittently to verify that power is on. To turn off the receiver, press and hold for three seconds.
Adjustment knob – Rotate clockwise to tighten and counter-clockwise to loosen.
Power connector – For battery charging, connecting to machine power, or connecting to a control box.
Laser receiver window – Accepts laser strikes to determine elevation position.
Battery indicator – Charged battery: The LED is off. Low battery: The red LED blinks at 1 Hz. Dead battery: The red LED stays on continuously and the four corners blink until there is not enough power to run the unit.
Grade display – Indicates the current correction state: HI, ON GRADE, LOW.
Offset on-grade – Adjusts the on-grade location. Press twice within one second to switch from Normal mode to Excavator mode. Press once to verify operating mode.
Normal mode: The on-grade lights illuminate for one second.
Excavator mode: The top two display lights illuminate for one second.
On-grade width – Adjusts the on-grade accuracy – With a standalone receiver, each button push sequences the receiver through the three available deadbands.
Plumb indicator – Press twice within one second to activate plumb mode. The top two and bottom two display lights will illuminate alternately indicating the mode has been activated. Press once to see what mode you are in.
Standard mode: The on-grade lights are illuminated.
Plumb mode: The top two and bottom two display lights illuminate alternately.
A slow pulse of the display lights indicate the top of the receiver is away from the operator and the receiver is not plumb (±2.5º). A fast pulse of the display lights indicate the top of the receiver is towards the operator and the receiver is not plumb (±2.5º). To exit the mode, press twice within one second.

Bandwidth Selections

Center on-grade

Bandwidth Selections

On-grade location

Select center for elevation control and offset for depth control.

	On-grade is in the center of the receiver. Center (green lights) appear when there is equal above and below grade information.
	On-grade is nearer the top of the receiver. Center (red lights) appear when there is more above grade information.