Laser
Reference, Inc.
Service Manual
TM
Pro Shot
L1-M and L1-S
Models
Confidential: This document contains Laser Reference Inc.
proprietary information and shall not be duplicated, disclosed
to others, or used for purposes other than to carry out the
intent for which this material is delivered.
Version 1.5 June 1998
Contents
How to Contact Us:............................................................................................................. 2
External Parts Detail Model L1-M ..................................................................................... 3
External Parts Detail Model L1-S....................................................................................... 4
Internal Parts Detail Model L1-M....................................................................................... 5
Internal Parts Detail Model L1-S........................................................................................ 6
Housing & Lighthouse Model L1-S ................................................................................... 7
Motor Problems Model L1-M Only.................................................................................... 8
Motor Problems Model L1-S Only..................................................................................... 9
Power Problems ................................................................................................................ 10
Laser\Receiver Interaction ................................................................................................ 11
Calibration Problems ........................................................................................................ 12
Calibration Problems 2 ..................................................................................................... 13
Calibration Problems 3 ..................................................................................................... 14
Low Battery Indication – Not cured with new Batteries .................................................. 15
Laser Will Not Switch Grade Alarm Modes..................................................................... 16
Actual Slope Does Not Match Setting Indicated by Counter ........................................... 16
Basic Tools And Knowledge. ........................................................................................... 17
1. Special tool list: .................................................................................................... 17
2. Other tools and supplies needed: .......................................................................... 18
Periodic maintenance and service checks......................................................................... 19
1. Calibration check: ................................................................................................. 19
2. Alarm deadband check:......................................................................................... 20
3. Out of level alarm function check:........................................................................ 20
4. Motor stall and re-start check: (L1-M Only) ........................................................ 20
5. Beam power check:............................................................................................... 20
Repair Examples. .............................................................................................................. 21
1. Adjust both grade alarm deadbands:..................................................................... 21
2. Replace rotation motor:......................................................................................... 21
2. Replace main P.C.B.:............................................................................................ 21
IV Repair Procedures. ................................................................................................... 21
#101 Clean and Calibration ......................................................................................... 21
#103 Base Plate Removal and Replacement.............................................................. 22
#106 X-Axis Sensor Removal and Replacement...................................................... 24
#107 Circuit Board Removal and Replacement......................................................... 26
#108 Setting Grade Alarm Dead Bands..................................................................... 27
#109 Motor Removal and Replacement .................................................................... 28
#109-S Motor removal and replacement - For Model L1-S ........................................ 30
#110 Squaring Motor Assembly to Beam.................................................................. 31
#111 Penta Mirror Removal and Replacement.......................................................... 32
#111-S Penta Mirror Removal and Replacement ........................................................ 32
#112 Beam Power Adjustment .................................................................................... 33
#113 Vertical Vial Calibration Procedure.................................................................... 33
PCB Layout....................................................................................................................... 35
Schematic for L1-M / S..................................................................................................... 36
L1-S Board Update Info.................................................................................................... 37
1
How to Contact Us:
Laser Reference, Inc.
Manufacturer of Pro Shot Products
450 Salmar Ave.
Campbell, CA. 95008
Toll Free (USA) 1-800-238-0685
Telephone +1-408-370-4929
Fax +1-408-866-0858
Email
World Wide Web www.proshotlaser.com
sales@proshotlaser.com
2
Fig. 1
External Parts Detail Model L1-M
3
Fig. 1A
External Parts Detail Model L1-S
4
Fig. 2
Internal Parts Detail Model L1-M
10-0495 LCD
assembly
5
Fig. 2a
Internal Parts Detail Model L1-S
6
Housing & Lighthouse Model L1-S
7
Motor Problems Model L1-M Only
8
Motor Problems Model L1-S Only
9
Power Problems
10
Laser\Receiver Interaction
Units sold with the R4 Receiver will stop rotating when the
transmitter is moved out of level.
11
Calibration Problems
12
Calibration Problems 2
13
Calibration Problems 3
14
Low Battery Indication – Not cured with
new Batteries
15
Laser Will Not Switch Grade Alarm
Modes
Actual Slope Does Not Match Setting
Indicated by Counter
16
Basic Tools And Knowledge.
The list following this explanation describes the basic tools necessary to
perform the procedures detailed in this manual. Where special tools made
by Laser Reference are listed, equivalent substitutes can be used. The
recommended repair times for each procedure are, however, based on the
use of the Laser Reference special tools. The recommended repair times
assume factory training or equivalent experience. Recommended repair
times are listed in hours and/or decimal fractions.
The Laser Reference factory, and Laser Reference distributors, will train
technicians from qualified and approved dealer service centers based on
mutually acceptable advance scheduled appointments. There will be no
charge for training time, but each trainee must provide their own
transportation and living expenses.
During the term of the warranty on Laser Reference products (see
warranty statement for details) Laser Reference, or It's distributor, will
reimburse an approved service center for warranty repairs based on the
repair times listed in this manual. The dollar rate of reimbursement per
hour will be set by the distributor (Laser Reference is the distributor in the
United States - see dealer agreement for details). Repairs may be sent
directly to the distributor for repair if the dealer is not equipped or trained to
perform these operations.
Dealers who wish to become service centers must apply for approval.
Please contact your distributor for further information.
1. Special tool list:
Description: Part No.
Tilt Table (for alarm dead band adjustment) 50-1010
Calibration alignment range 50-1000
Universal power supply 50-1025
Centering target (for use with I.R. viewer) 50-1030
Remote L.C.D. display 50-1070
Squaring system 50-1065
Focus adjustment tool 50-1080
17
2. Other tools and supplies needed:
Description:
Loctite 290 or equivalent
Nyogel 773A or equivalent
General Electric R.T.V. 108 or equivalent
Grounded soldering iron
Oscilloscope
Static-free work station
FIG. 4
Axis conventions used in this manual
Refer to the owner's manual if you are not familiar with the operation
and use of the controls and displays on the product. The owner's
manual also includes a basic calibration check routine that may be
useful in the event that you do not have the Laser Reference #501000 calibration range or equivalent.
18
Periodic maintenance and service
checks.
1. Calibration check:
Procedure: Using the 50-1000 Calibration alignment range or equivalent.
A. Place the laser on the calibration range stand.
B. Power-up the laser in "cal mode":Press and hold the alarm mode button. Press and
release the power button. Release the alarm mode button.
C. Rotate the laser such that the grade counter (+ X axis) is facing the optical instrument.
Allow about 30 seconds for the sensor to settle and then re-level the laser as required.
D. Adjust the alignment range calibration receiver to obtain an on-grade indication, and
find the center of the on-grade reading. Record this reading.
E. Rotate the laser 180 degrees and re-level it. Wait for the laser to settle and adjust as
required.
F. Adjust the alignment range calibration receiver to obtain an on-grade indication, and
find the center of the on-grade reading. Record this reading.
G. Move the calibration receiver to the mid point between the two recorded readings.
H. Use the X axis leveling screw to tilt the laser until an on grade reading is achieved.
I. Using a 1/4" wrench, adjust the Cross Axis calibration screw until the Cross Axis
display is centered. Wait for about 30 seconds to be sure no further adjustment is needed.
J. Rotate the laser 90° so that the + Slope Axis is facing the optical instrument. Level the
laser and wait for about 30 seconds to be sure no further adjustment is needed.
K. Without moving the calibration receiver, adjust the laser until an on grade indication
is achieved.
L. Center the Slope Axis sensor using the potentiometer on the back of the laser inside
the battery compartment. Wait for about 30 seconds to be sure no further adjustment is
needed.
M. To check for cone error, adjust the centering receiver to obtain an on grade
indication. Now, adjust the calibration receiver to obtain an on grade indication. The
difference from the known zero point (if any) is the error.
N. To check for squaring error, do not move the calibration receiver after completing the
three axis calibration above, rotate the laser approximately 150 degrees and align it with
the scribed mark on the alignment range. Level the displays and wait for about 30
seconds to be sure no further adjustment is needed.
O. Record the position of the calibration receiver and then adjust it until an on grade
indication is achieved. The difference shown (if any) is the error.
19
2. Alarm deadband check:
Procedure: Using the 50-1010 tilt table (or equivalent).
Place the laser on the tilt table with either the slope or cross axis aligned longitudinally.
Turn the laser on and center both displays, leaving it in standard grade alarm mode.
Now, move the tilt table pointer slowly in one direction past the first widening of the
"bubble" until the second segment turns off and the "bubble" is at it's widest. Move the
pointer back and forth slowly until you have located the point where the second segment
just goes off. Rotate the graduated wheel until the nearest mark is aligned with the
pointer. Move the pointer back across center to the other limit of the deadband, counting
the graduations as you go. Locate the point where the second "bubble" segment just goes
off on this side. The two edges of the standard deadband should be 100 arc-seconds apart
± 10 arc-seconds. Now, repeat the procedure for the other axis. If either axis is not within
tolerance, refer to the adjustment procedure.
3. Out of level alarm function check:
(Note Lasers sold with R4 Receivers stop rotating when out of level.)
Procedure:
Using the R1 or R2 receiver, Place the laser on a tripod or other secure surface. Turn the
laser on and center both displays. The receiver should display elevation information as
normal. Move one leveling screw until the laser is out of it's selected range. Now, the
receiver should display either the text or graphic laser off grade symbol. Once the laser is
re-leveled, the receiver will once again display grade information. If the receiver does
not display the laser off grade mode when the laser is off level, refer to the
troubleshooting flow charts or the repair procedures for further help.
4. Motor stall and re-start check: (L1-M Only)
Procedure:
Reach into the beam exit slot of the laser with your finger and stop the penta mirror from
spinning. The L.C.D. displays should flash the inner segments of the "bubbles" while the
motor is stopped. Once the motor is released, the displays should return to normal and
the laser should once again begin to rotate. If the laser does not return to rotation, refer to
the troubleshooting flow charts or the repair procedures for further help.
5. Beam power check:
Procedure:
Check the output beam power of the laser using a reliable laser power meter. The output
power should not be below .45mw. If the power is below this level, the distance at which
the R4 receiver will recognize the beam may be reduced. If the power is below this level,
refer to the troubleshooting flow charts or the repair procedures for further help.
20
Repair Examples.
The following examples detail the repair times involved in some specific repair cases.
1. Adjust both grade alarm deadbands:
Proc. No. Description Time
#108 Set Grade Alarm Deadbands .25
#101 Clean and Calibration (to be added to all repairs) .75
total 1.0
2. Replace rotation motor:
Proc. No. Description Time
#109 Motor removal and replacement (includes squaring
and penta replacement)
#101 Clean and Calibration (to be added to all repairs) .75
.75
total 1.5
2. Replace main P.C.B.:
Proc. No. Description Time
#107 Circuit board removal and replacement (includes
setting deadbands and beam power)
#101 Clean and Calibration (to be added to all repairs) .75
total 1.25
IV
Repair Procedures.
.5
#101 Clean and Calibration
Tools required: Calibration range Time:
1/4” wrench .75
21
A. See maintenance section.
#103 Base Plate Removal and Replacement
Tools required: 3/32" hex driver Time:
1/8" hex driver .25
A. Removal
1. Using 1/8" hex driver, remove 10-32 spring tension screw.
2. Using 3/32" hex driver, remove 4-40 positioning screw.
3. Rotate base plate 1/8 turn counter clock wise until x-axis leveling
screw cradle is free of x-axis leveling screw. Slide plate forward to clear
s-axis leveling screw.
A. Replacement
1. Slide base plate onto s-axis leveling screw.
2. Rotate base plate clockwise until x-axis leveling screw cradle is around
x-axis leveling knob.
3. Insert 4-40 screw (with washer and o-ring) through base plate into
brass support post.
a. Tighten screw just enough to expand the size of the o-ring to the
size of the washer. DO NOT OVER TIGHTEN
4. Insert spring tension screw through base plate into instrument plate.
a. Tighten screw until bushing is flush with end of tripod receptacle.
#105 Slope Sensor Removal and Replacement
Tools required: 7/64 hex driver Time:
Phillips head driver .5
Needle nose pliers
Flat blade driver
Soldering iron
22
FIG. 5 Slope Sensor Wiring
A. Removal
1. Remove sensor wires from circuit board.
2. Remove roll pin from tension spring
3. Remove retainer screw from sensor pivot point (front of laser).
4. Loosen two Phillips head screws on back of counter.
5. Using small needle nose pliers or flat blade screw driver, carefully lift
the gear off the lead screw.
a. Lightly grab gear under tooth wheel and rock slightly while lifting
Outside Lead
Inside Lead
Slope Sensor
Black Marked Wire
up.
P. C. B .
b. Insert blade of driver between bottom of gear and nylon lead screw
bushing. Rotate driver blade.
6. Using 7/64" hex driver, remove two screws holding counter plate.
7. Lift counter plate assembly up and off lead screw.
8. Remove washer from lead screw.
9. Rotate grade knob until sensor is clear of lead screw.
B. Replacement
1. Apply Nyogel or equivalent heavy lubricant to the threads of the brass
block.
2. Thread lead screw into brass block of sensor (tall part of sensor up)
3. Insert sensor pin into pivot point guide.
4. Replace sensor pin retainer screw.
5. Solder sensor wires into circuit board (refer to drawing).
6. Replace washer on lead screw.
7. Replace counter plate assembly and screws.
23
8. Rotate grade knob until sensor is bottomed out.
9. Replace roll pin in tension spring.
10. Adjust counter plate alignment.
a. Loosen counter plate screws.
b. While turning the grade knob, tilt the counter plate until a smooth
feel is achieved.
c. Tighten screws.
11. Replace lead screw gear
12. Adjust counter position.
a. Position counter with top aligned with top of counter plate.
b. Tighten upper screw enough to hold counter in place.
c. Shift counter over until gears mesh with minimal backlash and no
binding.
d. If sensor operates backward, reverse positions of the two leads
coming from the top of the sensor assembly.
13. Adjust slope axis grade alarm deadband (see procedure # 108)
#106 X-Axis Sensor Removal and Replacement
Tools required: 1/4" socket driver Time:
Broad tipped Phillips driver .5
Soldering iron
Phillips screwdriver
FIG. 6
Cross Sensor Mounting (outside end)
(inside end)
24
FIG. 7
Cross Sensor Mounting
FIG. 8 Cross Sensor Wiring
Leads solder in from back or P.C.B.
A. Removal
1. Remove base plate assembly (refer to procedure #103).
2. Remove sensor leads from the circuit board (leads are soldered).
3. Using a Phillips driver, loosen the sensor guide screws.
4. Using a 1/4" socket driver, remove the x-axis calibration screw.
5. Using a broad tipped Phillips driver, remove the screw at pivot end of
sensor.
6. Lift the sensor off of the instrument plate. Note: pivot bearings are
under the sensor.
Rear Lead
Front Lead
Cross Sensor
P. C . B .
Mount
Black Marked Wire
B. Replacement
1. Solder the sensor wires into the circuit board (refer to drawings above).
2. Place the sensor on the instrument plate.
25
a. Ensure both pivot bearings are in instrument plate, under pivot end of
sensor.
b. Position the tension spring under the calibration end of the sensor.
3. Insert the 8-32 Phillips head screw with washers into pivot end (refer to
drawing).
a. Tighten the screw until bottomed out and back off 1/8 turn.
4. Insert the x-axis calibration screw through the instrument plate and
tension spring.
a. Thread the cal. screw into the brass calibration bar until approximately
1/4 inch of it is through.
5. Push the sensor standoffs against the sensor assembly and tighten the
guide screws.
6. Replace base plate assembly (see procedure #104)
7. Adjust the cross axis grade alarm dead band (see procedure #108)
#107 Circuit Board Removal and Replacement
Tools required: Grounded soldering iron Time:
.5
FIG. 9 Circuit Board Connections and Adjustments
Connections for
Slope Sensor
Connections for
Cross Sensor
Grade Alarm Potentiometers
Clockwise adjustment
makes deadband
smaller
Laser Power Pot.
Microprocessor
Grade Alarm Pots.
S-Axis
X-Axis
26
A. Removal
1. Remove harnesses and diode wires CAUTION!! STATIC WILL
RUIN THE LASER DIODE - REMOVE THE DIODE LEADS ONLY AT A
GROUNDED STATION USING A GROUNDED SOLDERING IRON AND
WEARING A STATIC LEASH.
2. Remove the three circuit board holding screws.
3. Remove the L.C.D. harness from it's connector. Remove the housing
harness from it's connector (housing connector may be secured with
R.T.V. glue).
4. Remove the sensor leads. Note the colors and locations of the three
laser diode wires and remove them. Note: When removing laser diode
wires, a grounded soldering iron must be used.
B. Replacement
1. Replace all wiring (refer to drawing).
2. Position circuit board against holding brackets and tighten three
holding screws (ensure spacers are between circuit board and holding
brackets).
3. Re-connect the diode wires according to your notes made during
removal.
4. Re-connect the cross and slope sensor leads (see procedures #105 and
#106)
Caution! Before applying power to the P.C.B., the beam
power potentiometer must be set to a safe level (turn 5 to 6
turns counter clock wise to be safe). The laser diode will be
ruined if it is powered-up at too high a setting. Set the beam
power (refer to procedure #112).
5. Set the grade alarm deadbands (refer to procedure # 108).
#108 Setting Grade Alarm Dead Bands
Tools required: Tilt table Time:
Small flat blade driver .25
Note: Refer to fig. 9 for location and pot. adjustment direction.
1. Turn dead band pots to approx. 1/2 of their range. (pots are on the main
P.C.B.)
2. Place the laser on the tilt table,
3. Level the laser in "standard" mode.
27
4. Rotate the tilt table pointer counter clockwise slowly until the "bubble" in the
display is on the verge of setting off the "Grade Alarm".
5. Without moving the pointer, position the tilt table plate so that a major division
is under the pointer.
6. Slowly rotate the pointer clockwise until the "bubble" in the display is on the
verge of setting off the "Grade alarm".
7. Observe the total distance of the pointer travel. 100 arc-seconds is the proper
spec. ±10 seconds.
Note: Adjust the pots as required to obtain the proper specifications.
#109 Motor Removal and Replacement
Note: For model L1-S, see procedure # 109-S
Tools required: 5/64" hex driver Time:
9/64" hex driver .75
.050" hex driver
Soldering iron
1/4" socket driver
Low profile 1/4" wrench
A. Removal
1. Remove the battery cover and batteries.
2. Using a 9/64" hex driver, remove halo assembly support screws.
3. Remove the halo assembly from the main housing. Note: do not
remove the screws from the post. This will keep them in the proper
places. The screws are not necessarily interchangeable. The lower screw
must be shorter by 1 thread and will protrude into the housing and contact
the diode housing if it is not shortened.
4. Using a 5/64" hex driver, remove the plastic top housing from the halo
assembly.
5. Using a .050" hex driver, loosen the set screw in the penta mirror base
and remove the mirror assembly.
6. Re-attach the halo assembly to the main housing. (ensure that the
spacing washers are between the support bar and the housing)
Remove the wires from the motor terminals.
28
FIG. 9 Motor Mounting and Adjustment points
8. Scribe a mark around the motor mounting plate (this is to ensure proper
centering when installing the new motor assembly).
9. Remove the three holding nuts and washers.
10. Remove the motor assembly.
B. Replacement (does not apply to L1-S)
1. Position the motor assembly in alignment with scribe marks made in
step A8.
2. Replace and tighten the holding nuts and washers.
3. Solder the motor wires to the motor terminals.
4. Check squaring (refer to procedure #110).
29
#109-S Motor removal and replacement - For Model
L1-S
Tools required: 7/64” ball driver Time:
.050" hex driver .75
Soldering iron
1/4" socket driver
Low profile 1/4" wrench
squaring check range
(s/t#50-1065 or equiv.)
A. Removal
1. Remove the top cover using a 7/64” ball driver.
2. Remove the wires from the motor terminals.
FIG. 5 Motor mounting and adjustment points
3. Scribe a mark around the motor mounting plate (this is to ensure proper
centering when installing the new motor assembly).
4. Remove the three holding nuts and washers.
5. Remove the motor assembly.
6. Using a .050” hex driver, loosen the set screw in the penta mirror base
and remove the mirror assembly.
B. Replacement
1. Install the penta mirror assembly onto the motor shaft, leaving
approximately 1/64” between the penta mirror base and the motor holding
screws.
30
2. Position the motor assembly in alignment with scribe marks made in
step A3.
3. Replace and tighten the holding nuts and washers.
4. Solder the motor wires to the motor terminals.
5. Check squaring
#110Squaring Motor Assembly to Beam
Tools required: Loctite 290 Time:
1/4" socket driver .25
Low profile 1/4" wrench
Squaring Tool (50-1065
7/64” Ball Driver
A. Set up range for squaring.
B. Adjust squaring.
1. Align the unit with either side of the X-axis facing the visible laser
source.
2. Level the unit in both axes and turn the unit on.
3. Locate the reflected beam on the target and record its location.
4. Rotate the laser 180 degrees and re-level.
5. Find the beam again and mark its location.
6. Determine the midpoint between the two previous points.
7. Raise or lower beam using adjustment points A and B (see fig. 9).
a. Bring the beam to the midpoint mark (with vials level).
8. Rotate the laser 180 degrees and relevel, then check adjustment.
a. Re-adjust as required.
9. Rotate laser 90 degrees, aiming the +S axis towards the target and relevel.
Note: All readings must be within 1/4” of each
other at 4’.
10. Adjust point C (see fig. 9) to bring the beam to the midpoint location.
11. Re-check all readings and adjust as required.
12. Secure all three nuts and apply Loctite 290.
13. Install top cover.
31
#111 Penta Mirror Removal and Replacement
Note: For model L1-S, see procedure # 111-S
Tools required: .050" hex driver Time:
5/64 hex driver .25
Penta mirror spacer (S/T)
9/64 hex driver
1/16" 90° hex driver
A. Removal
1. Loosen halo assembly support bar screws and remove halo assembly
from housing. Leave screws in the bar to be sure they return to the same
places.
2. Using the .050" 90° hex driver, loosen the set screw in the base of the
penta mirror assembly.
3. Remove the penta mirror assembly.
B. Replacement
1. Place penta spacer (S/T# 50-1060) against the underside of the halo
assembly.
a. Slide the penta mirror assembly onto the motor shaft until it contacts
the spacer tool.
2. Using the .050" 90° hex driver, tighten the set screw in the penta mirror
assembly.
4. Replace the halo assembly.
NOTE: TAKE CARE NOT TO PINCH WIRES
#111-S Penta Mirror Removal and Replacement
Refer to motor replacement procedure #109-S for instructions.
Note: The lighthouse may have a number written along the top or bottom edge
of the glass. Please indicate this number when ordering a replacement penta
mirror.
32
#112 Beam Power Adjustment
Tools required: laser power meter Time:
small straight slot screwdriver .25
1. Position power meter over beam output aperture.
Caution: If P.C.B has been replaced, start the adjustment procedure by turning
the potentiometer 5 to 6 turns counter clock wise to reduce the power.
2. Rotate beam power adjustment potentiometer to obtain an output power
at the aperture of about 1mw. This may vary depending on the optics.
Final power should be checked with all optics in place (.45mw to .55mw).
#113 Vertical Vial Calibration Procedure
Tools required: Infra-Red viewer (part1) Time:
Optical level (part 1) .25
Plumb line (part 2)
DANGER: During this procedure, laser emissions
from the beam aperture will be class IIIB! Take all
necessary precautions to avoid exposure.
1. Procedure using Infra-Red Viewer:
a. Remove laser housing (see procedure #101).
b. Attach the laser to the vertical adapter accessory (model V1).
c. Be sure the beam projects away from any contact with people. You
will need approximately 50 feet (15 meters) of range to project to your far
point. Apply power to the laser and, using the infra-red viewer, adjust the
laser (using the S axis leveling foot) until the beam is approximately
horizontal.
d. Dis-connect power from the laser and set-up an optical level (or
another laser) as a level reference and adjust the instrument height to the
center of the output aperture of the laser to be calibrated.
DANGER:
Do not sight or look directly into the laser
beam with the optical instrument! Avoid
all exposure to the beam.
e. Transfer the elevation of the output aperture to the far point. Make a
mark at this height on the far point.
f. Re-connect power to the laser so that the beam is on again.
33
g. Using the infra-red viewer to see the beam on the far point, adjust the
laser to center it's beam on the center of the mark made in step e.
h. If the vertical vial is not indicating level, loosen one of the screws that
attach the vial holder and pry the holder until a level indication is
achieved.
i. Tighten both screws and check that the laser is still on the mark and that
the bubble is still indicating level.
j. Re-install housing (see procedure #102) and check laser calibration.
2. Procedure without Infra-Red viewer.
a. Without removing the housing, attach the laser to the vertical mounting
accessory (model V1).
b. Set the laser so that its vertical plane of light is projecting
perpendicular to a wall about 30 feet (10 meters) away. The wall should
be as high as you have the ability to reach to the top. 15 feet (5 meters) is
sufficient. Level the vertical vial.
c. Using the laser receiver, make a mark at the bottom of the wall
indicating beam center. For maximum accuracy, make two marks at the
points where you just get an on-grade indication as you come in from each
side. Use the middle of the two marks for center.
d. Now, make a mark (or set of marks) at the top of the wall.
f. Return to the laser and turn it 180° so that the beam is projecting toward
the wall from the opposite side of the laser. Set the receiver at the bottom
mark and use the X axis leveling screw to align the laser to the receiver.
Re-level the vertical vial. Use the receiver to check the top mark(s). if
there is an error of more than 1/8 inch in 25 feet (3.2mm in 7.5 meters),
the sensor should be adjusted.
g. To adjust the vial, loosen the three screws that attach the housing to the
reference plate, but keep them just tight enough to hold the housing
against the reference plate. Align the laser with the bottom mark again.
Now, make a mark half between the two top marks made earlier. This
mark represents true vertical. Use the S axis leveling screw to adjust the
laser until it is in alignment with the top (true vertical) mark. Check that
the laser is still aligned with the bottom mark. Carefully remove the
housing and tilt the housing back just enough to allow
access to the vertical vial.
h. Loosen one of the screws that attach the vial holder and pry the holder
until a level indication on the vial is achieved.
i. Tighten both screws and check that the bubble is still indicating level.
j. Re-install housing (see procedure #102) and re-check the vertical
alignment.
34
PCB Layout
35
Schematic for L1-M / S
36
Newer boards
must have
insulators
between screw
heads and board
L1-S Board Update Info
Add low battery
threshold
adjustment pot, 102645, across R24 if
the threshold is
lower than 4.45V, in
“OFF” mode. Clip
one of the outer
leads and solder the
other leads across
R24.
Clip out Q1 to
disable spin-up
Replace
capacitors,
10-2060, (4)
if marked
with “IC”
and batch
“H-27”
Replace if it has the
“Phillips” logo and
unstable calibration.
the customer has
complained of
Replace deadband adjustment
pots, 10-2645, if not blue or
yellow 500K pots
Clip out
I.C. to
disable
spin-up
If there is a “spin-up” routine upon start-up
and there is a piggyback board installed
then the “spin-up” function should be
disabled and a new type of motor(gold
body) installed.
37
38
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