Thank you for purchasing the Welch Allyn LX-150 Light Source. The
operating and maintenance instructions found in this manual should
be followed to ensure many years of accurate and reliable service.
Please read these instructions thoroughly before using your new
LX-150 Light Source.
The user of this equipment should be thoroughly trained in the
medical procedures appropriate to the instrumentation. Furthermore, time should be taken to read and understand these instructions before performing any procedures. Instructions for other
equipment used in conjunction (e.g. electrosurgical generators,
suction machines, etc.) should also be read and understood. Failure
to do so may result in injury to the patient and/or damage to the
150w Halogen (#04050)
Max. Flow Rate
6.6 p.s.i. Max.
Independent Air Switch
(W)11" x (H)5 1/2" x (D)9 1/2"
115v A.C. + 10%
1. Main Power Switch-controls all power into light source.
Without activation, all other controls will not function.
2. Air Feed Switch-activates flow of air at air output connector
(on right side of box).
3. Illumination Control-controls intensity of light output at
endoscope connector port.
4. Endoscope Connector Port-accepts endoscope connector
terminal of endoscope to complete illumination pathway.
5. Water Bottle Bracket-couples water bottle to light source.
6. Air Output Connector-couples to air input hose on
7. Lamp Access Door-opens to allow for lamp replacement.
8. Air Input Hose-couples to light
source air output connector.
9. Air/Water Output-couples to dual
lumen air/water line of flexible
10. Mounting Bracket-couples to water
bottle bracket on light source to
Prior to Initial Use
The cabinet of this unit should always be grounded correctly and
securely during use. Do not disable the line cord ground
LX-150 should not be used in the presence of any flammable gas.
The LX-150 and connected endoscope should not be used with
electrosurgical instruments that exceed safety leakage current
or whose safety in linkage is not guaranteed.
Immediately stop using the light source if liquid enters the cabinet.
Do not look directly into endoscope connector port when it is
Preparation for Use
The light source should be set upon a firm, horizontal surface.
Care must be exercised to keep both sides of the illuminator free
of obstructions to permit efficient circulation of air.
Connection to Supply Source
Check to verify that the power switch is off.
Couple the supply cord to a 115v/60Hz hospital grade receptacle
that meets the input ratings on the rating plate.
Insert the endoscope connector terminal into the endoscope
connector terminal port. (Note: Endoscope alignment pin should
point toward the bottom of the light source).
Push the terminal firmly into the port until it “clicks” into place.
Connecting Water Bottle
Remove cap and fill the water bottle with clean tap water until
Replace cap and tighten firmly.
Hook water bottle to bracket on right side of light source. (Note:
DO NOT attempt to fill water bottle while it is connected to
Couple air output connector hose to air output connector on
Couple dual lumen air/water line to top of water bottle. Connect
remaining fittings to corresponding air/water input connectors
Prior to every examination, the equipment should be pre-tested
following the procedures outlined below. If an abnormality is detected
or suspected, contact Welch Allyn Customer Service for assistance.
Activating Light Source
Switch power switch to “on”.
Set brightness knob midway between (+) and (-) settings.
Check the distal tip of endoscope to verify that light is being
emitted from distal light guides.
Verify that internal cooling fan is operating by listening to whirring
noise from light source.
If unit does not power up, contact Welch Allyn Customer Service
If fan is activated but no light is emitted, lamp is defective.
Refer to maintenance section for replacement procedure.
Adjusting Light Intensity
Light emitted from the distal tip of the endoscope will increase
as the brightness knob is rotated toward the ( + ) and conversely
the intensity will diminish when rotated toward (-).
With power switch “on”, turn on the air switch.
Verify that air and water flow normally from distal tip of endoscope
when corresponding valves are depressed.
NOTE: If air/water flow falls below normal, contact Welch Allyn
Disconnect and empty the water bottle. Wash with mild soapy
water and rinse.
Disconnect power cord from receptacle.
Wipe external surface of source and power cord with gauze
moistened in alcohol.
Store in a clean, dust-free environment at room temperature.
Avoid direct sunlight and areas of high temperature/humidity.
Do not wind power cord so tightly that it will crush, twist or bend.
1. Turn power switch to “off” position and unplug power cord
2. Uncouple air input hose and remove water bottle from bracket.
3. Flip the light source 180o and place top face down on a
4. Open lamp access door by inserting a coin in slot and turning
release latch 1/4 turn counterclockwise. (Note: before touching
lamp, allow for sufficient time to cool.)
5. After lamp has cooled, pull the lamp holding lever toward the
back of the unit until the lever reaches an almost vertical position.
6. Remove expired lamp from the lamp holder.
7. Prior to installing new lamp, remove protective cap.
8. Return the lever to its original position. The new lamp may then be
inserted into the holder and advanced until it “snaps” into place.
(Note: lamp must be fully inserted to assure proper contact).
9. Close and secure lamp access door.
(Note: Use replacement lamp #04050)
For service, ship light source to:
For assistance, telephone:
Welch Allyn Customer Service
Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153-0220
Attention: Repair Department
Printed in U.S.A.
Part No. 451502