Welch Allyn 49500 User manual

Welch Allyn Light Source
For Model Numbers: 49500. 49502. 49504 and 49506.
Ligh t Sourc e Menu
Service Manual
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Welch Allyn

CONTENTS
Thank you loi 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

SYMBOL DESCRIPTIONS
Attention: Read Operating Manual lor Warnings. Precautions,
and Instructions tor Use.
Dangerous Voltage: Reler Servicing to Qualilied Personnel.
Type B Equipment
Caution — Hot
Warning: Risk ot Fire. Replace Fuses as Marked.
Light; Lighting; illumination Intensity
INDICATIONS
Use ot the Welch Allyn Light Source is indicated tor medical lighting applica¬
tions requiring a remotely located, high-quality white light. This product must
only be used by qualilied medical personnel.
CONTRAINDICATIONS
The use ot the Welch Allyn Light Source is contraindicated tor applications
where high intensity light might burn or damage tissue: such as tor neonate
transillumination and ophthalmic procedures. For lurther contraindications,
the user must also consult the operating manual ot the instrument being
used with the Light Source in the medical procedure.
1

WARNINGS AND PRECAUTIONS
WARNING: Possible explosion hazard. Do nol 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
sensitive tissues.
Do not use for neonate transillumination. Erythema
may result.
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
are interconnected.
Do not sterilize the Welch Allyn Light Source. Refer to
Cleaning section for cleaning instructions.
Do not switch the Welch Allyn Ugh! Source ON and OFF
in rapid succession. Doing so will dramatically shorten
lamp life. Allow lamp to cool down 10 to 15 seconds
between uses.
2

CAUTION: The Light Source should only be used by
qualilied 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 il damage
is discovered.
Do not use or store liquids above or on the Welch Allyn
Light Source.
II this light source is used during invasive surgery, the
lailure 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.

SYSTEM DESCRIPTION
The Welch Allyn Light Source is used to supply high quality, white light
tor video and optical illumination systems. It accepts standard ACMI
connectors.
Mounting Post Mounting Bracket
BOTTOM
4

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
light output.
A CAUTION: Verily 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
liber 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
is removed.
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
instrument.
3. Turn the power switch to the on position. The lamp will take 15 seconds
to complete its warm-up cycle.
Minimum
Light Output
Maximum
Light Output
Fiber Optic
Bundle Port
Control Knob
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.
5

MOUNTING
A CAUTION: Do not cover or drape, light source generates heat.
For proper ventilation, maintain a clearance ol 3 inches (8 cm)
around the unit, especially around the tan.
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
to table.
VIEW A
Supplied
Screws
VIEW B
6

LAMP REPLACEMENT
A CAUTION: Lamp may be hoi. Alov/ the lamp lo cool before
replacing.
1. Turn unit oil and unplug the power cord Irom bolh Ihe v/all oullet and the
Welch Allyn Light Source.
2. Remove the lamp door Irom the bottom of the Welch Allyn Light Source
by unscrewing the lamp access Knob on the back ol the lightbox.
3. Disconnect the lamp connector assembly and remove the lamp (torn the
holding spring assembly.
4. Replace with Welch Allyn replacement lamp #09500 only. Do not touch
Ihe lamp itselt. or the interior reflective surface ot the lamp. Skin oils
on the lamp will cause premature lamp lailure. Hold lamp by the outside
ol 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
the lamp.
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.
7

FUSE REPLACEMENT
1. Turn the unit otf and remove the power cord from both the wall outlet and
the Welch Allyn Light Source.
2. Use a small screwdriver to remove the tuse holder above the power cord
connector by releasing the spring-loaded snap connections.
3. Pull out the luse holder.
4. Remove and replace with new fuses ot 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 Sen/ice
at 315-685-4560.