1. Turn unit off and unplug the power from the light engine
2. Rotate lamp spring retainer from lamp spring
3. Disconnect the lamp connector and remove the lamp by pulling
back and up against the lamp spring
4. Replace with Welch Allyn replacement lamp only
5. Reconnect the lamp to the connector and insert lamp so that
the lamp is seated properly in the lamp block; pay attention to
applicable keys or alignment pins
6. Rotate lamp spring retainer back into position over lamp spring
Discharge lamps fail for a variety of causes that all relate
to thermal and mechanical stresses imposed by the extreme
operating temperatures inside the lamp. Typical failure
modes include chamber rupture (sometimes with an
audible pop), cracking and leaks of chamber, and cracking
and leaks of or near the glass-to-metal seals. These types
of failure modes are normal and do not imply a
defective lamp.
If the lamp fails to ignite:
• Check input and output wiring polarity and integrity
• Attempt ignition a second time after properly resetting the
ballast by disconnecting and reconnecting the input voltage
• Verify proper input power—both voltage and current
• Ensure the anode wire is not routed near any metal or
other conductor
• Ensure that no arcing occurs on the ballast assembly in the
area near the P1 connector. (A dark room enables visual
detection of arcing)
• Ensure that no arcing occurs between the ballast assembly and
any adjacent subassembly within the system (components,
subassemblies, wire harnesses, etc.). A 9.53 mm (0.375") air
spacing (or higher dielectric strength) is recommended in the
above mentioned areas
Lamp Stability
Unstable lamp operation accompanied by a markedly
bluish cast to the light may indicate an overcooled lamp.
Verify proper power input and operation of the thermal
control circuit.
Early lamp failure accompanied by a markedly reddish
cast to the light may indicate a lamp that is overheated.
Verify proper power input and operation of the thermal
control circuit. Verify that no obstructions exist in the
airflow path.
Maintenance and Repair (LE)
Only qualified personnel should make electrical inspections
and repair Welch Allyn S ¯olarc light engines, light modules
and light boxes.
For additional troubleshooting or repair information,
contact Welch Allyn at 315.685.4347.
Refer to Welch Allyn Lighting Product’s standard terms
and conditions of sale for warranty information.
For over 80 years, Welch Allyn has pioneered the
development of precision lighting systems in medical
diagnostic instruments. And throughout this time, the
hallmark of every Welch Allyn miniature lighting system
has been quality. Using several proprietary manufacturing
processes, our design engineers ensure that each Welch
Allyn lamp will operate in conformity with its quoted
specifications. This commitment to product quality and
performance was confirmed again in 1996 when Welch
Allyn’s Lighting Products division was certified for
ISO 13485.
Welch Allyn’s S ¯olarc lamps combine all the features you’re
looking for in a lamp: solar-quality illumination, low
power consumption, precision focus, safety and multiple
wattage configurations. All this—along with Welch Allyn’s
assurance that each and every S ¯olarc lamp will operate to
specifications—combines to deliver lamps that ensure your
product’s success.
To take full advantage of the design possibilities that
S ¯olarc can deliver, feel free to draw from our experience
in designing products using S ¯olarc lamps by contacting us.
If you would like further guidance and/or information on
any of the design issues found in this manual—or for
information on our complete line of miniature Halogen
HPX
™
lamps—contact a Welch Allyn representative today
at 315.685.4347.
Thank you.
If the above steps fail to correct the problem:
LAMP REPLACEMENT INSTRUCTIONS
(LE, LM, LB MODELS)
TROUBLESHOOTING
WARRANTY
CONCLUSION
11
