BYK AT-4725, Руководство по эксплуатации

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10. Changing Lamps and
Fuses Changing Lamps
CAUTION: Before changing a
lamp, switch off the instrument,
unplug it from the power source,
and let the lamp cool.
Remove the cover above the
display by unscrewing the two
screws and pushing the cover
toward the back.
Unplug the lamp unit from the cable
connecting it to the rest of the unit.
The lamp unit is secured in place
with a knurled screw. Unscrew this
and carefully withdraw the lamp unit
from its clip.
Do not reach into the interior of
the instrument, and be careful
not to let anything drop through
the instrument opening.
Now insert the new lamp unit
carefully into its seating. Do not
touch the glass body of the lamp
with your bare fingers. Oily residues
will burn permanently onto the
glass. If you unintentionally touch
the glass, it must be cleaned with
rubbing alcohol. Secure the lamp
unit with the knurled screw and plug
it back onto the cable. Make sure no
objects have been left inside the
instrument, and then close the
cover by slipping it into the guide
from the rear and fastening it to the
chassis with the two screws.
The instrument must be recalibrated
after a lamp is changed.