21
TROUBLESHOOTING
If lamp is not
illuminating and…
Possible Cause
Solution
fan is not
operating.
Light box 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 bottom of unit.
Power switch is not
turned on.
Depress the green side of
the power switch.
One or both fuses have
blown.
Replace both fuses. Follow
the instructions in the fuse
replacement section. If fuses
continue to blow, return
Light Box to an authorized
repair center.
Power cord is damaged.
This may cause
intermittent operation.
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.
fan is operating.
The lamp has burned
out.
Replace with a new Welch
Allyn lamp, model # 04200.
Refer to the Lamp
Replacement Section.
If light output
seems low.
Lamp is not in optimal
orientation.
Rotate lamp 90° in the lamp
holder.
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