Skytron ST19 Series User manual

OWNERS MANUAL
REV 4-06
ST19
SERIES SURGICAL LIGHTS
OPERATION / MAINTENANCE / PARTS

Page 1
TABLE OF CONTENTS
TITLE PAGE
REV. 4/06
Although current at the time of publication, SKYTRON'S policy of continuous development makes this
manual subject to change without notice.
EQUIPMENT LABELS AND SPECIFICATIONS .............................................................................3
SPECIAL USER ATTENTION ............................................................................................................4
SECTION I Introduction .......................................................................................................................6
SECTION II Operation .........................................................................................................................7
SECTION III Maintenance ...................................................................................................................9
3-1. General ...................................................................................................................................9
3-2. Daily Maintenance...................................................................................................................9
3-3.Sterilization..............................................................................................................................9
3-4. Bulb Changing........................................................................................................................10
3-5. Preventative Maintenance Procedures..................................................................................11
SECTION IV Adjustment ...................................................................................................................12
4-1. General ..................................................................................................................................12
4-2. Lighthead Pitch Adjustment....................................................................................................13
4-3. Lighthead Roll Adjustment......................................................................................................13
4-4. Vertical Travel Tension Adjustment .......................................................................................14
4-5. Lighthead Horizontal Rotation Adjustment .............................................................................15
4-6. Radial Arm Horizontal Rotation Adjustment ...........................................................................17
4-7. Bulb Voltage Adjustment ........................................................................................................17
SERVICE............................................................................................................................................19
WIRING DIAGRAMS..........................................................................................................................20
SECTION V Replacement Parts........................................................................................................22
5-1. Mounting Hub and Radial Arm Assembly ..............................................................................22
5-2. Balance Mechanism and Yoke Assemblies...........................................................................24
5-3. Yoke Assembly......................................................................................................................28
5-4. Bulb and Reflector Assembly.................................................................................................30
5-5. Lighthead Assembly...............................................................................................................32
5-6. ST19S Stand Model Assembly ..............................................................................................34
5-7. Wall Control Assembly...........................................................................................................38
OriginalPrinting 7/04
Revised 4/05
Revised 4/06

Page 2

Page 3
CLASS I DEFIBRILLATION PROOF, TYPE B EQUIPMENT- IPX4 RATED.
INTERNALLY POWERED EQUIPMENT
FOR DRY LOCATIONS
UNIT TO BE USED ONLY IN SPECIFIED ENVIRONMENTAL CONDITIONS
TEMPERATURE: 15˚ - 30˚ C (60˚ -85˚ F)
HUMIDITY: 30% - 60% RELATIVE HUMIDITY, NON CONDENSING
ATTENTION, CONSULT MANUAL FOR FURTHER INSTRUCTIONS.
INDICATES SPECIAL USER ATTENTION.
AC VOLTAGE
TYPE B
EQUIPMENT
EQUIPMENT LABELS AND SPECIFICATIONS
FUSE TYPE 3 AMP, SLOW BLOW TYPE
3A
- GRAND RAPIDS, MI
ELECTRIC RATING CAT. NO.
SAFETY FUSE IPXO CLASS 1
TYPE B
BULBSTYPE 24V 50W
INPUT 120V H24501
60Hz
DAI-ICHI SHOMEI CO., LTD. TOKYO, JAPAN
SERIAL NO.
MODEL
(CAT. NO.)
FUSE
TYPE
SERIAL NO.
The lighthead Data Label contains the lighthead
model number, bulb type, fuse type, electrical specifications
and product serial number.
ENTELA CERTIFIED
TO UL2601-1
CAN/CSA601.1, IEC 60601-2-46

Page 4
Priortouse,allpersonnelthatmayoperatethis
fixture must be instructed in the correct opera-
tional procedures.
Initialuseshouldnotbegin untilaftertheusers
have been instructed by the manufacturer's
representative.
Aroutineinstructionalprogrammustbeimple-
mentedby thefacilityforproperusageinstruc-
tions for all personnel that may operate this
light.
As with the operation of any surgical light, all
hospital personnel should be aware that a cer-
tainamountof caremustbe exercisedtomain-
tain patient safety and to keep your SKYTRON
light fixture performing at peak efficiency.
The following precautions should be reviewed
by all personnel prior to operating the light.
WARNING
Indicatesapossibilityofpersonalinjury.
CAUTION
Indicates a possibility of damage to
equipment.
NOTE
Indicatesimportantfactsorhelpfulhints.
SPECIAL USER ATTENTION
WARNING
DONOTusethisfixtureinthepresence
of FLAMMABLE GASES.
NOTE
To prolong bulb life, the sof-start bulb
protectioncircuitwillcauseaslightdelay
before the bulbs will illuminate.
WARNING
Be sure sterile handle is properly
securedbeforeusingthelighthead. An
improperly installed handle could fall
out,resultinginpossibleinjurytopatient
or surgical staff.
CAUTION
Use extreme care when positioning
lightheads. Bumping lightheads into
one another, into walls, or other
equipment may alter bulb alignment
which affects proper focus adjustment.
NOTE
All repairs should be made using only
authorized SKYTRON replacement
parts.

Page 5
CAUTION
Use of incompatible cleaning agents
willcausedamageto thefixture. Avoid
the use of cleaning solutions which
contain high concentrations of alcohol,
ethelene glycol, phenol, iodophors, or
glutaraldehyde based disinfectancts.
Staining, pitting, discoloration and
diffusercrackingmayoccuriftheseare
used.
WARNING
Be sure the power is turned "OFF" and
thebulbshavecooledbeforechanging.
WARNING
DO NOT attempt to remove a bulb by
pullingontheglasssurfaceorendcap.
This may cause the bulb to break off in
your hand.
CAUTION
Halogen bulbs are sensitive to body
oils. DONOThandlethe glasssurface
of the bulbs as body oils from your
fingerscancreatea"hotspot"andmay
causethebulbtoburnoutprematurely.
This can best be avoided by using the
plastic wrapper that the bulb is
packaged in or a clean cloth wrapped
around the base of the bulb when
installing.
NOTE
To extend the life of the bulb reflector
surface, it should not be included in
normal cleaning. Is should be cleaned
only if absolutely necessary. Clean
gentlywithaclean,damp,softclothand
a mild soap solution. NO abrasives.
WARNING
Apply BLUE LOC-TITE to any
replacement or loose vertical support
tube attaching screws.
NOTE
•Recheck the mounting plate to make
sure it is absolutely level. In most
cases,relevelingthemountingplatewill
solve any drifting problems.
•If the lighthead sticks or is difficult to
move,beforemakinganyadjustments,
lubricatetheBOMneedlebearingswith
a Teflon type spray lubricant such as
TRI-FLOW(availablefromRichardson-
Vicks,Inc.,Memphis,TN)orequivalent.
See figure 4-10. After spraying, rotate
the lighthead several times in both
directions and recheck for proper
tension.
NOTE
Theinternalcircuitry usedintheStellar
system requires the use of a true RMS
type digital voltmeter to accurately
set the bulb voltage. Premature bulb
failurewillresultfromincorrectvoltage.

Page 6
The Stellar ST19 series surgical lighting system
from SKYTRON features fully adjustable position-
ing control for its cool, color-corrected, multiple
bulb, light source. Combinations of vertical posi-
tioningandmultiplerotationalcapabilitiesallowthe
single or dual lighthead models virtually limitless
positioning.
Thefixturesaresinglepointceilingmountedwitha
continuous 360 degree rotation capability at the
ceiling mount end of the radial support arm. See
figure 1-1. The balance mechanism which is at-
tached to the radial arm by a vertical support tube,
providesthelightheadanadditionalcontinuous360
degree rotation point. The balance mechanism is
an enclosed spring tension system. This allows
verticalmovementofthe lighthead whilemaintain-
ingthelightheadpositionwithoutdrifting.Theyoke
provides additional 360 degree rotation points for
lighthead pitch and roll.
The ST19 fixtures have a lighthead vertical travel
capability of 110°.
ThestandardST19serieshasalightheadmounted
ON/OFF/Intensity control switch and the fixture
fuse is located in the Ceiling Cover. The ST19WC
series utilizes a Wall Control which contains the
Main Power switch, Intensity control and fuses.
Alllightheadshavea removable,sterilizable,posi-
tioning handle. This allows all final positioning ad-
justments or changes to be precisely done by the
surgeon.Non-sterilehandlesarealso providedfor
Nurse positioning. See figure 1-2.
Figure 1-1. Light Fixture Rotation Capabilities
SECTION I INTRODUCTION
Figure 1-2. Positioning Adjustments
360˚
360˚ 360˚
PITCH
360˚
VERTICAL SUPPORT TUBE
PITCH
360˚
ROLL
360˚
ROLL 360˚
BALANCE MECHANISM
110˚
VERTICAL
TRAVEL
STERILIZABLE POSITIONING HANDLE

Page 7
SECTION II OPERATION
Use the following instructions to operate the light
fixture:
a.Positionthelightheadsasrequiredbygrasp-
ing the lighthead positioning handles and moving
the lighthead to the desired position. See figure 2-
1.
WARNING
DONOTusethisfixtureinthepresence
of FLAMMABLE GASES.
b.Turnthelightfixturemainpowerswitch"ON"
atthewallmountedswitchorWallcontrol(ST19WC
& ST1919WC models) and select the desired in-
tensityforeachlightheadasrequired. Seefigure 2-
1 or 2-2. The mid-range position will provide ad-
equateilluminationformostprocedures.Fullinten-
sity will usually only be required for extreme deep
cavity cases.
Figure 2-1. Dual Lighthead Fixture
NOTE
To prolong bulb life, the sof-start bulb
protectioncircuitwillcauseaslightdelay
before the bulbs will illuminate.
VERTICAL SUPPORT TUBE
VERTICAL SUPPORT TUBE
BALANCE MECHANISM
BALANCE
MECHANISM
RADIAL ARM ASSEMBLY
STERILIZABLE
POSITIONING HANDLE
STERILIZABLE
POSITIONING HANDLE
POSITIONING
HANDLES
INTENSITY
CONTROL KNOBS
SAFETY
FUSES
MAIN
POWER
SWITCH
6
010
19
28
37
456
010
19
28
37
45
INTENSITY
CONTROL
KNOBS
3
Figure 2-2. ST1919WC Wall Mounted
Control Box

Page 8
c. When the surgeon is ready to use the light,
installthesterilizedcenterpositioninghandleusing
the following procedure. See figure 2-3. Be sure
handleisproperlysecuredbeforeusingthelighthead.
Possible injury to patient or staff could result if a
handle is not installed properly.
1. Insert the handle into the lighthead at-
tachment ring.
WARNING
Be sure sterile handle is properly
securedbeforeusingthelighthead. An
improperly installed handle could fall
out,resultinginpossibleinjurytopatient
or surgical staff.
2. Push the handle in, turn it right and left,
andpullthehandleouttobecertainthatitislocked
(PUSH-TWIST-PULL). A distinct click can be
heard when the handle is properly engaged.
3. To remove the handle, push the release
button and pull the handle out.
STERILIZABLE
POSITIONING HANDLE
HANDLE
RELEASE BUTTON
Figure 2-3. Sterile Positioning Handle
Installation
d.Forlowanglelightingapproach,thelighthead
will move 90° below horizontal. Pull the lighthead
down by the positioning handles or the (sterile)
positioninghandle.
CAUTION
Use extreme care when positioning
lightheads. Bumping lightheads into
one another, into walls, or other
equipment may alter bulb alignment
which affects proper focus adjustment.
e. When the light is no longer required, return
the lighthead to its full up position. Decrease the
intensity and turn the main power switch "OFF".

Page 9
3-1. General
Toinsureproper operationandtoextendthelifeof
your SKYTRON surgical lighting system, the fol-
lowing preventive maintenance procedures are
recommended.
NOTE
All repairs should be made using only
authorized SKYTRON replacement
parts.
3-2. Daily Maintenance
Daily or between cases, the lighthead exterior
should be wiped down with a mild cleaning agent
whichwillnotaffectthepaintedoracrylicparts. Do
not apply or spray cleaning agents directly on the
lighthead.
CAUTION
Use of incompatible cleaning agents
willcausedamageto thefixture. Avoid
the use of cleaning solutions which
contain high concentrations of alcohol,
ethelene glycol, phenol, iodophors, or
glutaraldehyde based disinfectancts.
Staining, pitting, discoloration and
diffusercrackingmayoccuriftheseare
used.
•Use plexiglass cleaners, DO NOT use alcohol
based cleaners on the acrylic diffusers.
•Alwaysconsultwiththemanufactureroftheclean-
ing agent for proper application and use. Always
spot test on an inconspicuous area before use.
•Avoid personal injury. Do not attempt to clean
lighthead unless power is turned off at wall control
and fixture has sufficiently cooled.
•Avoidusingexcessive amountsofspraycleaners
near top cover vents. Leakage of fluids into the
interioroflightheadmaycausecorrosionofelectri-
cal components.
•Periodically the filter/diffuser assemblies should
be removed and dusted with a clean cloth or
washed and air dried as a complete assembly.
•DO NOT operate lights without the filter/diffuser
assemblies in place.
3-3. Sterilization
Recommended sterilization parameters for
sterilizablehandle:
a. Prevac, 270° F, 4 minutes
b. Gravity, 250° F, 30 minutes
c. Flash, 270° F, 3 minutes
Always consult current AORN journal recommen-
dations for proper sterilization procedures.
SECTION III MAINTENANCE

Page 10
Figure 3-1.
WARNING
DONOTattempttoremovethebulbby
pullingontheglasssurfaceorendcap.
This may cause the bulb to break off in
your hand.
b. Using caution not to touch the reflector
surface, hold the bulb by the base and pull it out.
See figure 3-2. Slightly working the bulb back and
forth may aid in bulb removal.
3-4. Bulb Changing
Since SKYTRON Surgical Lights contain multiple
bulbs,itwouldnotnormallybenecessarytochange
a burned out bulb during a surgical procedure.
To replace a bulb, use the following procedure:
WARNING
Be sure the power is turned "OFF" and
the bulb has cooled before changing.
a. Hold the diffuser/filter assembly with one
hand, loosen the "1/4-turn" screw and lower the
diffuser/filter assembly. See figure 3-1. Figure 3-2.
CAUTION
Halogen bulbs are sensitive to body
oils. DONOThandlethe glasssurface
of the bulbs as body oils from your
fingerscancreatea"hotspot"andmay
causethebulbtoburnoutprematurely.
This can best be avoided by using the
plastic wrapper that the bulb is
packaged in or a clean cloth wrapped
around the base of the bulb when
installing.
c. Holding the bulb by the base, plug it directly
intothesocket.Donottouchtheglassportionofthe
bulb reflector surface with your fingers. This can
best be done by using the plastic wrapper that the
bulb is packaged in or a clean cloth wrapped
aroundthebaseofthebulbwheninstalling.Besure
bulb base is properly seated in the connector to
insure proper focus alignment.
REFLECTOR
SURFACE
END
CAP
BASE
1/4 TURN SCREW

Page 11
NOTE
To extend the life of the bulb reflector
surface, it should not be included in
normal cleaning. Is should be cleaned
only if absolutely necessary. Clean
gentlywithaclean,damp,softclothand
a mild soap solution. NO abrasives.
d.Replacethediffuser/filterassemblybyplac-
ing the tab into the lighthead face. Place the
assembly in position and secure it with the "1/4-
turn" screw.
3-5. Preventive Maintenance Procedures
The following procedures should be done semi-
annually or sooner as needed.
a. Lightheadtopcovershouldberemovedand
any accumulation of dust or lint removed.
b. All attaching hardware (screws, nuts, etc.)
should be physically checked for tightness. Any
missing hardware MUST be replaced.
WARNING
Apply BLUE LOC-TITE to any
replacement or loose vertical support
tube attaching screws.
c. Rotatetheradialarmassembliesaroundthe
ceiling mount to check the slip ring/brush block
assemblies. With electrical power "ON", if the
lights become intermittent or go out, check and
repair or replace the brush block or slip ring as
necessary.
d. Check the remaining slip ring/brush block
assemblies by raising, lowering, and rotating the
lighthead through its full range of motion. With
electricalpower"ON",ifthelightsbecomeintermit-
tent or go out, check and repair or replace the
appropriate brush block or slip ring as necessary.
e. Check all fixture rotation axes for proper
adjustment. Adjustasnecessaryusingapplicable
adjustment procedures from the adjustment sec-
tion of this manual (Section IV).
f. Check light bulb voltages to ensure maxi-
mumbulblife.

Page 12
A - Lighthead Pitch Axis --------------------------------------------------paragraph 4-2
B - Lighthead Roll Axis ----------------------------------------------------paragraph 4-3
C - Vertical Travel Tension -----------------------------------------------paragraph 4-4
D - Lighthead Horizontal Rotation-------------------------------------paragraph 4-5
E - Radial Arm Horizontal Rotation -----------------------------------paragraph 4-6
Figure 4-1. Fixture Rotation Axis
4-1. General
As a part of normal preventive maintenance, all fixture rotation axes adjustments should be checked
and adjusted as necessary. Refer to figure 4-1 for location of desired check or adjustment procedure.
SECTION IV ADJUSTMENT
E
D D
B
A
B
C

Page 13
Figure 4-3. Top Cover Removal
4-2. Lighthead Pitch Adjustment
a. Checkthepitchaxistensionofeachlighthead
by moving it through its full range of motion. See
figure 4-2.
Figure 4-2. Lighthead pitch
b. The lighthead should move freely yet main-
tain its position without drifting. If an adjustment is
required, remove the top cover and proceed as
follows:
1. Carefully move trim strip for access to
the corner plate screws and remove the (3) top
screws. See figure 4-3.
2. Using a 1/8" straight blade screwdriver,
releasethe(4)locktabsandremovethetopcover.
c. Rotatethelightheaduntilanallenset screw
is visible through the adjustment hole. Loosen the
setscrew,rotatethelighthead180°andloosenthe
second set screw. See figure 4-4.
PITCH
PIN PUNCH
HOLE
YOKE
SET
SCREW (2)
LOCK
TAB
LOCK
TAB
TRIM
STRIP
CORNER
PLATE
LOCK
TABS
ACCESS
HOLE
Figure 4-4. Lighthead pitch adjustment
d. Rotatethelightheaduntilaholeisvisible and
insert a pin punch into the hole in the adjustment
nut.
e. Withthenutheldcaptivewiththepinpunch,
rotate the lighthead clockwise to increase the fric-
tion or counterclockwise to decrease the friction.
f. Remove pin punch and check adjustment.
Tighten set screws when adjustment is complete.
g. Install top cover and secure with the (3)
screws removed from the corner plates. Do not
overtighten screws.

Page 14
Figure 4-7. Lighthead Vertical Travel
VERTICAL
TRAVEL
4-3. Lighthead Roll Adjustment
a.Checktherollaxistensionofthelightheadby
moving it through its full 360° range of travel. See
figure 4-5.
Figure 4-5. Lighthead Roll
b. The lighthead should move freely yet main-
tain its position without drifting. If an adjustment is
required,refertofigure4-6andproceedasfollows:
Figure 4-6. Roll Adjustment
c. Rotate the yoke until an allen set screw is
visiblethroughthe adjustmentholeandloosenthe
set screw. Rotate the yoke 180° and loosen the
second set screw.
d. Continuetorotatetheyokeuntila5mmhole
is visible through the hole. Insert a pin punch into
the hole in the adjustment nut.
e. Withthetensionnutheldcaptivewiththepin
punch, rotate the yoke clockwise (viewed from the
front)toincreasethefriction andcounterclockwise
to decrease the friction.
f. Remove pin punch and check the lighthead
forpropertension. Repeatadjustmentprocedureif
necessary. Aftertheadjustmentiscorrect,besure
to tighten the set screws.
4-4. Vertical Travel Tension Adjustment
a. ChecktheadjustmentoftheBalanceMecha-
nismforitscapacitytosupportthelightheadthrough-
out its range of vertical motion. See figure 4-7.
SUPPORT
ARM
YOKE
SET SCREW (2)
HOLE
PIN
PUNCH
ROLL

Page 15
4-5. Lighthead Horizontal Rotation
Adjustment
a. Checkhorizontalrotationaxisadjustmentby
movingthelightheadthroughitsfullrangeof travel
around the Balance Mechanism. See figure 4-9.
HORIZONTA
L
ROTATION
ADJUSTMENT
SLOT
COVER
PLATE
PIN
PUNCH
Figure 4-9. Horizontal Rotation
b. The lighthead should maintain its position
withoutdrifting,yetmovefreelyaroundtheBalance
Mechanism. Normally this adjustment is correct
fromthefactoryanddoesnotchange.Ifthelighthead
drifts, the most likely cause is an unlevelmounting
plate.
b. The lighthead should move freely yet main-
tainitsselectedposition withintherangeof motion
without drifting. If an adjustment is necessary,
refer to figure 4-8, and proceed as follows:
Figure 4-8. Vertical Travel Adjustment
c. Remove two screws securing the cover
plateandremovethecoverplatefromtheHorizon-
tal Support Arm.
d. Pullthelightheaddownwarduntiltheadjust-
mentnutisvisiblethroughtheadjustmentslotinthe
support arm.
e. Insert a pin punch through the adjustment
slotandintoaholeofthespringtensionadjustment
nut. Using the pin punch, turn the adjustment nut
clockwise to increase the tension, counterclock-
wise to decrease the tension.
f. Remove the pin punch, check and repeat
adjustment procedure as necessary to achieve
properspringtension. Thelightheadshouldbeable
to hold its position at any angle from the VST.
g. Reinstall cover plate on the Horizontal
Support Arm.

Page 16
NOTE
•Recheck the mounting plate to make
sure it is absolutely level. In most
cases,relevelingthemountingplatewill
solve any drifting problems.
•If the lighthead sticks or is difficult to
move,beforemakinganyadjustments,
lubricatetheBOMneedlebearingswith
a Teflon type spray lubricant such as
TRI-FLOW(availablefromRichardson-
Vicks,Inc.,Memphis,TN)orequivalent.
See figure 4-10. After spraying, rotate
the lighthead several times in both
directions and recheck for proper
tension.
BOM
VST ADJUSTMENT
HOLE
BEFORE
PENCIL
MARKS
PIN
PUNCH
AFTER
CHROME
PLUG
BOM
Figure 4-10 . BOM Lubrication
c. Ifrelevelingthemountingplateorlubricating
the BOM needle bearings does not correct the
problem, an adjustment may be required. This
adjustment is made by increasing or decreasing
the bearing preload. Refer to figure 4-11 and
proceed as follows:
d. Locate the adjustment hole. This hole is
located just beneath the lower VST screws in the
BOM and has a slotted head chrome plug in it.
e. Remove the chrome plug, rotate the lighthead
aroundtheBalanceMechanismuntilanysetscrewsare
visiblethroughtheadjustmenthole andloosenthem.
Figure 4-11. Horizontal Rotation Adjustment
f. Continuetorotatethelightheaduntilaholein
thenutisvisiblethroughtheadjustmenthole. Insert
a pin punch through the adjustment hole and into
the hole in the nut.
g. To determine the amount of adjustment,
rotatethelightheadsothepinpunchistouchingone
sideoftheadjustmentholeanduseapenciltomark
areferencelineasshowninfigure4-11. Rotatethe
lighthead so the pin punch is touching the other
side of the adjustment hole and mark another
reference line as shown in figure 4-11.
h. With the nut held captive by the pin punch,
rotate the lighthead so that the pencil marks are
approximately1/8"apart. Turnthelightheadclock-
wise (viewed from the bottom) to increase the
tension and counterclockwise to decrease the
tension. Insomecasesitmayrequireconsiderable
force on the lighthead to make this adjustment.
i. Removethepinpunchandcheckthelighthead
forpropertension. Repeatadjustmentprocedureif
necessary. When proper adjustment has been
achieved, tighten the set screws and install the
chrome plug.

Page 17
Figure 4-13. Top Cover Removal
360˚
E
Figure 4-12.
c. If releveling the mounting plate does not
correct the drift, or the Radial Arms are difficult to
move, the bearing preload must be adjusted. This
requires the use of special tools. Contact your
SKYTRON dealer for assistance.
4-7. Bulb Voltage Adjustment
To insure maximum intensity and to prolong bulb
life, the voltage applied to the lighthead should be
20VAC ± 0.2V. Use the following procedures to
test and adjust the bulb applied voltage.
Remove the top cover using the following proce-
dure: See figure 4-13.
a. Carefully move trim strip for access to the
cornerplatescrewsandremovethe(3)topscrews.
b. Using a 1/8" straight blade screwdriver,
releasethe(4)locktabsandremovethetopcover.
4-6. Radial Arm Horizontal Rotation
Adjustment
a. Checkthehorizontalrotationaxistensionby
moving the Radial Arms through their full range of
travel around the center mounting hub. Refer to
figure4-12.
b. The Radial Arms should maintain their
positionwithoutdrifting yetmovefreelyaroundthe
hub. Normally this adjustment is correct from the
factory and does not change. If the Radial Arms
drift,themostprobablecauseisanunlevelmount-
ingplate.
NOTE
Recheck the mounting plate to make
sure it is absolutely level. In most
casesrelevelingtheplatewillsolveany
driftingproblem.
LOCK
TAB
LOCK
TAB
TRIM
STRIP
CORNER
PLATE
LOCK
TABS
ACCESS
HOLE

Page 18
ST19 Models
a. Test bulb voltage at the terminal strip. Turn
main power "ON" and set the Dimmer Control to
maximum intensity for the test. Output voltage (at
the terminals) should be 20V± 0.2V. See figure 4-
14.
LIGHTTERMINALS
TERMINAL STRIP
Figure 4-14. Bulb Voltage Test
NOTE
Theinternalcircuitry usedintheStellar
system requires the use of a true RMS
type digital voltmeter to accurately
set the bulb voltage. Premature bulb
failurewillresultfromincorrectvoltage.
b.Adjustthevoltagetothelightheadbyturning
the adjuster on the lighthead circuit board. See
figure4-15.
CIRCUIT BOARD
ADJUSTER
Figure 4-15. Voltage Adjustment (ST19)
c. Turn the adjuster clockwise to increase the
output voltage, counterclockwise to decrease the
voltage.
d. Install top cover and secure with the (3)
screws removed from the corner plates. Do not
overtighten screws.