MAHLE RTI Laser 4 - Manual (Page 22)

Page 21
CALIBRATION PROCEDURE
Calibration of Right & Left Toe Gauge Laser Beams (continued)
3) Level the Toe Gauge and project the laser beam
image on the rear Retro-screen. (See Figure 44) The
center of the beam image must be on 6 and midway
up the mirror. If not, alternately loosen and tighten
Allen set screws on the laser diode retainer.
There are four Allen set screws on the laser diode
retainer. (See Figure 45) The top and bottom set
screws (D) control the vertical movement of the beam
image. The left and right screws (B) control side-to-
side movement of the beam image.
4) Check the location of the reflected laser beam image
on the Thrust Angle Scale on the Laser Toe gauge.
With the Rear-retro Screen level, the center of the
image should be mid-way up and on 5 on the Thrust
Angle Scale.
If not, adjust the two screws (M) (See Fig. 44) until
the image is on 5 and adjust screw (L) until the image
is mid-way up on the Thrust Angle Scale.
5) Remove the Left Toe Gauge and Left Retro-screen.
Mount the Right Toe Gauge and Right Retro-screen
and repeat steps 1 through 4.
The Retro-screen is now at a perfect 90 degree angle to the front Toe Gauge and the laser beam image
indicates zero toe on the Thrust Angle Screen.