
132 1100 Series DAD and MWD Reference Manual
4 Repairing the Detector
Cleaning or Replacing Coupling Lens Assembly
When required The coupling lens assembly is located between the tungsten and the
deuterium lamp. It may be replaced when light transmission is reduced and a
lamp exchange or window cleaning does not improve the light throughput.
Tools required Screwdriver POZI 1 PT3
hexagonal key 1.5 mm
A pointed pair of pliers
Parts required Coupling lens assembly G1103-68001
Preparations for this procedure:
• Turn off the lamp(s).
If the detector was in use, the lamp may be hot. If
so, wait five minutes until lamp cools off.
• Remove the front cover.
• Remove both lamps, see “Exchanging a Lamp” on
page 102.
1 Use the 1.5-mm hex key to loosen the setscrew that
secures the lens assembly.
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