Welch Allyn Light Source
For Model Numbers: 49500, 49502, 49504 and 49506.
Thank you for purchasing the Welch Allyn® Light Source, designed by a
leading worldwide manufacturer of illuminated diagnostic instruments.
By following the use and care guidelines given in this manual, you will be
rewarded with years of dependable, trouble-free service from your new
Light Source. Read these instructions thoroughly before use.
System Symbol Descriptions.......................... 1
Warnings and Precautions .............................. 2
System Description.......................................... 4
System Set-up/Operation ................................ 5
Mounting .......................................................... 6
Lamp Replacement .......................................... 7
Fuse Replacement .......................................... 8
Cleaning ............................................................ 9
Specifications .................................................. 10
Troubleshooting Guide.................................... 11
Maintenance and Repair.................................. 12
Warranty and Service ...................................... 12
Ordering Information ...................................... 13
Attention: Read Operating Manual for Warnings, Precautions,
and Instructions for Use.
Dangerous Voltage: Refer Servicing to Qualified Personnel.
Type B Equipment
Caution — Hot
Warning: Risk of Fire. Replace Fuses as Marked.
Light; Lighting; Illumination Intensity
Use of the Welch Allyn Light Source is indicated for medical lighting applications requiring a remotely located, high-quality white light. This product must
only be used by qualified medical personnel.
The use of the Welch Allyn Light Source is contraindicated for applications
where high intensity light might burn or damage tissue; such as for neonate
transillumination and ophthalmic procedures. For further contraindications,
the user must also consult the operating manual of the instrument being
used with the Light Source in the medical procedure.
WARNINGS AND PRECAUTIONS
WARNING: Possible explosion hazard. Do not use in the
presence of flammable anesthetics. To ensure patient
and operator safety, read and understand this manual
before using the Welch Allyn Light Source.
Do not remove cover. Electrical shock hazard due to high
internal voltage. There are no user serviceable parts
inside except for the lamp and fuse, which are accessible
through the bottom and back cover panels. Refer all
service to Welch Allyn.
Replace fuses as marked. See Fuse Replacement
Section, page 8.
The high intensity light at the front of the light source
and at the tip of the Fiber Optic Bundle may give rise
to high temperatures and bright light. To minimize the
risk of injury, avoid direct viewing or contact with
Do not use for neonate transillumination. Erythema
To prevent temporary blinding, always plug the fiber optic
bundle into the Welch Allyn Light Source before turning
the power ON.
Total system risk current — including the patient applied
instrument — should not exceed 100 microamps. An
isolation transformer is required if total system risk
current exceeds 100 microamps when accessories
Do not sterilize the Welch Allyn Light Source. Refer to
Cleaning section for cleaning instructions.
Do not switch the Welch Allyn Light Source ON and OFF
in rapid succession. Doing so will dramatically shorten
lamp life. Allow lamp to cool down 10 to 15 seconds
CAUTION: The Light Source should only be used by
qualified medical personnel.
Provide adequate ventilation to prevent overheating.
Do not cover or drape this light source. Provide a 3 inch
(7.62 cm) distance between the Welch Allyn Light Source
and any solid objects.
Grounding reliability is achieved only when connected
to hospital-use or hospital-grade receptacles. Inspect
electrical plug and cord routinely. Do not use if damage
Do not use or store liquids above or on the Welch Allyn
If this light source is used during invasive surgery, the
failure of a component within the system, causing loss
of illumination, may indirectly cause risk to the patient.
Therefore, it is recommended to have alternative means
of illumination available.
Since the light source uses a custom lamp, always have
a spare lamp available for replacement. Use caution
because lamp may be hot. Allow the lamp to cool before
replacing. Use only Welch Allyn supplied power cord.
The Welch Allyn Light Source is used to supply high quality, white light
for video and optical illumination systems. It accepts standard ACMI
SET-UP AND OPERATION
After a 15 second warm-up period, the light output will stabilize at its
normal intensity. The fiber optic bundle must be plugged in to stabilize
CAUTION: Verify that the supply voltage matches the voltage
range indicated on the rear of the Welch Allyn Light Source.
To prevent temporary blinding, turn power on only after the
fiber optic bundle is plugged in and the intensity control knob
is set to the minimum position.
The fiber optic bundle port is hot when fiber optic bundle
1. Plug the Welch Allyn Light Source into a hospital-grade receptacle.
2. Turn the light-intensity control knob to its minimum position. Plug the fiber
optic bundle into the illuminator port and connect the opposite end to the
3. Turn the power switch to the on position. The lamp will take 15 seconds
to complete its warm-up cycle.
4. Set light intensity to desired level.
5. Turn unit off when not in use.
NOTE: Do not restart lamp immediately after turning off. The lamp
may fail to start. If this occurs, turn the power switch off and wait
15 seconds before restarting the Welch Allyn Light Source.
CAUTION: Do not cover or drape, light source generates heat.
For proper ventilation, maintain a clearance of 3 inches (8 cm)
around the unit, especially around the fan.
Secure bracket to a flat surface with screws provided. Align mounting post
on Light Source with mounting hole on bracket (View A). Slide mounting
lock until it clicks into place (View B). Light Source is now securely mounted
CAUTION: Lamp may be hot. Allow the lamp to cool before
1. Turn unit off and unplug the power cord from both the wall outlet and the
Welch Allyn Light Source.
2. Remove the lamp door from the bottom of the Welch Allyn Light Source
by unscrewing the lamp access knob on the back of the lightbox.
3. Disconnect the lamp connector assembly and remove the lamp from the
holding spring assembly.
Lamp Connection Assembly
4. Replace with Welch Allyn replacement lamp #09500 only. Do not touch
the lamp itself, or the interior reflective surface of the lamp. Skin oils
on the lamp will cause premature lamp failure. Hold lamp by the outside
of the reflector or the connector only. Remove any grease or fingerprints
with a clean cotton swab moistened with alcohol. Do not leave any lint on
5. Reconnect the lamp to the lamp connector and place in the spring
mechanism. Be sure that the pin on the lamp is properly seated in
the slot on the lamp bracket.
6. Reattach the lamp door securely. The unit will not power up unless the
lamp door is seated properly.
1. Turn the unit off and remove the power cord from both the wall outlet and
the Welch Allyn Light Source.
2. Use a small screwdriver to remove the fuse holder above the power cord
connector by releasing the spring-loaded snap connections.
3. Pull out the fuse holder.
4. Remove and replace with new fuses of the same type. There is no
required orientation of the fuses. Be sure to replace both fuses.
5. Reinsert the fuse holder by pressing it into the power connector until it
snaps into place.
6. If the new fuse blows, immediately contact Welch Allyn Technical Service
NOTE: Welch Allyn Light Source should not be sterilized or
1. Prior to cleaning, turn power off and disconnect the power cord from both
the wall outlet and the Welch Allyn Light Source.
2. The external surfaces may be cleaned by wiping with a cloth dampened
with mild soap and water or by using the following cleaning/disinfecting
solutions. DO NOT IMMERSE.
• Cidex, CidexPlus
• 70% isopropyl alcohol
• 10% mild bleach solution
• 10% Wescodyne
3. The power cord may be wiped clean using the same cleaning/disinfecting
solutions listed above. Wipe dry with a clean cloth. Care must be taken
not to get the plug prongs wet. DO NOT IMMERSE.
4. Do not plug the unit into a wall outlet until it is thoroughly dry.
Input Voltage: 100 - 240 VAC, 50 - 60 Hz
Input Current: 1A (@ 100 VAC)
Output: 60 VDC @ 0.4A
Leakage Current: less than 100 microamps
8.2" (21 cm) (L) x 3.1" (8 cm) (W) x 5.2" (13 cm) (H)
Welch Allyn HI•Lux™ Lamp
Color Temperature: 5500°K
Lamp: 60 Volts, 24 watts
Lamp Life: 300 hours average
Manual Shutter: 20% to 100%
FIBER OPTIC BUNDLE INTERFACE
Standard ACMI Connector
CSA C22.2 NO 601.1-M90
The CE mark on this product indicates it has been tested to and conforms
with the provisions noted within the 93/42/EEC Medical Device Directive.
Declarations of Conformity are held by Welch Allyn’s European
European Regulatory Manager
Welch Allyn Ltd.,
Kells Road, Navan,
County Meath, Republic of Ireland.
Tel +353 46 28122
Fax +353 46 28536
Operating: 60° F (15° C) to 85° F (30° C)
Storage: -13° F (-25° C) to 140° F (60° C)
Class I, Type B, Continuous Operation
T1.0A L250V: 1.0A, 250V, time lag (slow-blow),
low breaking capacity
If lamp is not
illuminating and …
fan is not operating.
fan is operating.
Light Source is not plugged
into either the wall outlet or
the power cord socket.
Plug the power cord into the
wall outlet and power cord
socket at back of unit.
Power switch is not
Depress the “I” side of the
The bottom cover is not
Remove the bottom cover
and reinstall carefully,
making sure that the lip on
the bottom fits into the front
of the housing and that the
thumbscrew is fully tightened.
One or both fuses have
Replace both fuses. Follow
the instructions in the fuse
replacement section. If fuses
continue to blow, return Light
Source to an authorized
Power cord is damaged.
This may cause intermittent
Replace the power cord with a
new Welch Allyn power cord.
No power is supplied to
the wall outlet.
Verify that the wall outlet
has power by checking the
circuit breaker status and by
operating other equipment
at that wall outlet.
The lamp was not able to
“cool down” before restarting.
Wait at least 15 seconds
after turning the Light Source
off before turning it back on.
The Light Source has
Verify that all ventilation
slots and the fan area are
not obstructed. The Light
Source should be mounted
on the supplied mounting
bracket and there should
always be at least
The lamp has burned out.
Replace with a new Welch
Allyn lamp. Refer to the
lamp replacement section.
MAINTENANCE AND REPAIR
For minor trouble, refer to the troubleshooting section in this manual for
possible causes and corrective action.
Only qualified personnel should make electrical inspections of the
Welch Allyn Light Source.
Repair: To locate qualified personnel, contact your local authorized
Welch Allyn distributor, or call Welch Allyn directly at 315-685-4560.
WARRANTY AND SERVICE
Welch Allyn warrants the Welch Allyn Light Source when new, to be free
of defects in material and workmanship and to perform in accordance with
manufacturer’s specifications when subject to normal use and service for
a period of three years from the date of purchase from Welch Allyn or an
authorized agent. Welch Allyn will either repair or replace any components
found to be defective or at variance from manufacturer’s specifications within this time at no cost to the customer. It shall be the purchaser’s responsibility to return the instrument directly to the authorized distributor, agent, or
This warranty does not cover the HI•Lux Lamp or breakage or failure due to
tampering, misuse, neglect, accidents, improper installation, modification,
shipping, or to improper maintenance, service, and cleaning procedures.
This warranty is also void if the instrument is not used in accordance with
manufacturer’s recommendations or if required or serviced by other than
Welch Allyn or an authorized agent. Purchase date determines warranty
requirements. No other express or implied warranty is given.
Welch Allyn Light Source
U.S.A. Plug Type
Welch Allyn Light Source
European Plug Type
Welch Allyn Light Source
U.K. Plug Type
Welch Allyn Light Source
Australian Plug Type
24W HI•Lux Lamp
U.S.A. Power Cord
European Power Cord
U.K. Power Cord
Australian Power Cord
4341 State Street Road
Skaneateles Falls, NY 13153
Telephone: 800-535-6663, 315-685-4560
Part # 495002
Printed in U.S.A.