WARNING Welch Allyn is not responsible for the integrity of any
mounting installation. Welch Allyn recommends that customers
contact their Biomedical Engineering Department or maintenance
service to ensure professional installation for safety and reliability of
any mounting accessory.
GS 777 Wall Transformer
Adjust the light output by turning the rheostat on the handle.
• Turning the rheostat clockwise increases the light output.
• Turning the rheostat counterclockwise decreases the light output.
Note Decreasing the light output to the minimum level does not power
down the instrument.
Manual part no. 718210, 80017279 Ver. E
© 2012 Welch Allyn
Separate Waste Electronic
and Electrical Equipment
(WEEE) from other
disposables. Prepare this
product for reuse or separate
collection as specified by the
WEEE Directive 2002/96/EC
or local law.
Illuminated: Power is present.
Not illuminated: No power.
The product does not
substances above threshold
values defined in China
Standard SJ/T 11363 –
2006. The product is green
and environmental and can
be recycled after use.
Atmospheric pressure limitation
Safety Class II, Intermittent Operation
Follow the directions for use for the instrument head when examining a
Caution To prevent damage, do not overstretch the cords on the
Caution Host USB
to be used to power
Welch Allyn approved
Type BF applied part
Caution To minimize the external housing temperature of the
instrument head, on-time must not exceed 2 minutes, and off-time
must be a minimum of 10 minutes.
General warnings and cautions
WARNING Read and understand the instructions before using this
product. Failure to understand the operating requirements for
this product can result in injury to you or the patient and can
damage the product.
WARNING Explosion hazard. Do not operate this product in the
presence of flammable anesthetics or other flammable substances in
combination with air, oxygen-enriched environments, or nitrous
This product is intended to supply power to Welch Allyn 3.5V instruments.
Atmospheric pressure limitation
Return the handle to the cradle.
The 3.5V instrument powers down.
100–240V, 50–60 Hz, 0.18A max
Additional technical information
WARNING Before you clean the transformer, unplug it from the wall
IEC 60601-1, UL 60601-1, IEC 60601-1-2, CAN/CSA C22.2 No 601.1-M90,
WARNING Electric shock hazard. DO NOT autoclave the transformer
WARNING Electric shock hazard. Do not simultaneously touch the
patient and the center metal contact of the handle.
WARNING Liquids can damage electronics inside the transformer.
Prevent liquids from spilling on or dripping into the transformer. If
liquids are spilled on or drip into the transformer:
WARNING Do not modify this equipment. Any modification of this
equipment can lead to patient injury. Any modification of this
equipment voids the product warranty.
1. Disconnect the power plug.
Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153-0220 USA
2. Remove the transformer from the wall.
Welch Allyn Limited
Navan Business Park
Navan, County Meath
Republic of Ireland
3. Dry off excess liquid from the transformer.
Caution As a precaution, avoid using this product in close proximity
to other equipment. The product complies with current required
standards for electromagnetic interference and should not present
problems to other equipment or be affected by other devices.
4. Mount the transformer on the wall.
5. Verify that the transformer functions normally before using it.
Clean the transformer on a routine basis according to your facility's protocols
and standards or local regulations.
Caution Only authorized Welch Allyn Service Centers can perform
service on this product.
Caution To make sure that the transformer can be unplugged from
the AC power source, never block access to the wall socket.
Caution Rx only (for professional use).
Attach Welch Allyn 3.5V instrument heads of your choice to the handles. See
the directions for use for each instrument head.
Using the handles
Five-year limited warranty.
• A clean cloth slightly dampened with 70 percent isopropyl alcohol or 10
percent chlorine bleach solution. Wipe dry with a clean cloth.
Guidance and manufacturer’s declaration
1 3/8 in
• CaviWipes™ (see caution below).
Caution Do not use CaviWipes to clean the blue handle cradles. This
cleaning agent produces bubbles and liquid during the cleaning
process that can enter openings in the cradles and limit handle
performance for as long as 30 minutes after cleaning.
Ensure that the transformer is plugged in.
Lift the handle from the cradle.
The instrument powers on. Only one instrument can be powered at a
To clean the transformer (excluding the instrument heads), use any of the
To clean the instrument heads, follow the instructions provided in their
directions for use.
The guidance and manufacturer’s declaration information is available at