LAMBDA DG-4 & 5 PLUS/USB OPERATION MANUAL – REV.
61
5.1.3
Bulb Replacement
5.1.3.1
Removing the Existing Bulb
1.
Remove both terminals (see Figure 5-1) from the blue housing.
2.
Slide the bulb/heat sink assembly out from the blue housing.
3.
Pry one of the retaining clips off one of the heat sinks and remove the heat sink. If the
heat sink does not come off the bulb, insert a flat screw drive in the side slit of the heat
sink and widen the gap (Figure 5-3) to remove the bulb. Repeat with the second heat
sink.
Figure 5-3. Heat sink retaining-clip removal.
4.
Wipe off the white thermal compound from inside the heat sinks.
5.
The mounting ring (see Figure 5-1) might still be inside the front heat sink. Remove it
and set it aside. You will need it if the new bulb does not have one.
5.1.3.2
Installing the New Bulb
1.
Without removing the protective cap from the new bulb, apply a thin, even layer of
thermal compound to the side surfaces of the anode shell as shown in Figure 5-4.
CAUTION: Avoid touching the sapphire window. If heat transfer compound is
smeared on the window, it can be removed by gently wiping it off with a dry, lint-free
tissue (lens paper or lens cloth).
2.
Slide the rear heat sink on the anode shell and press on or lightly tap the retaining clip,
positioning it flush with the inside edge of the heat sink.
CAUTION: Once the retaining clips are in place, the heat sinks should be tight
enough not to slide around the bulb. If they still slide, remove the retaining rings, tighten
them using a vice or adjustable pliers, and then reaffix them on to the heat sinks.
3.
Remove the protective cap from the new bulb. If there is no mounting ring attached, use
the ring from the old bulb. Apply a thin, even layer of thermal compound on the cathode
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