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 TM 11-405-10
(c) Rotate the condenser lens assembly
(not shown) will release the lens
counterclockwise, to disengage the
board.).
assembly housing from the knurled
(b) Remove the projection lens.
screws, and remove the condenser
(c) Insert the replacement projection
lens assembly.
lens. Make sure that the lip on the
Note. Check to be sure that all elements
lens board (not shown) slips into the
are secure within the assembly housing.
slot in the focusing frame.
(d) Replace the clip (not shown) and
(d() Hold the replacement condenser
tighten the thumbscrew.
lens assembly so that the notches in
the assembly housing engage the
18. Loading Negative Carriers
knurled screws on the base of the
a. Dustless Negative Carrier.
The dustless
lamp house.
negative carrier is used when 4by 5-inch negatives are to
(e) Turn the condenser lens assembly
be enlarged (par. 26).
clockwise until the knurled screws
(1) PH-406 (A, fig. 21).
are fully engaged.
(a) Separate the upper plate (not
(f) Tighten the knurled screws.
shown) from the lower plate.
(g) Release the control lever (fig. 14).
(b) Place the negative, emulsion (dull)
'2) EN-16(1).
side down, on the lower plate.
(a) Loosen the knurled screws (fig. 3)
(c) Set the upper plate on the lower
on the base of the lamp house
plate and match the locating studs
reflector and lift off the lamp house
on the lower plate with the
reflector.
corresponding holes on the upper
(b) Pull out the color drawer.
plate.
(c) Lift out the condenser lens assembly
(2) ES-20(1) (fig. 22).
(not shown) and insert the
(a) Turn the spring clip and release the
replacement
condenser
lens
upper section.
assembly.
(b) Raise the upper section.
(d) Replace the color drawer and the
(c) Insert the negative, emulsion (dull)
lamp house reflector.
side down, into the lower section.
(e) Tighten the knurled screws.
(d) Move the upper section into plae4
c. Changing Projection Lens.
on the lower section.
(1) PH-129-(*) or PH-639(*)/TF (fig. 2).
(e) Secure the upper section with the
(a) Rotate the lens board (cup-Shaped
spring clip and the latch fastener.
or flat) approximately 1/4 turn until it
b. Glass Negative Carrier. The glass negative
is disengaged from the focusing
carrier is used when a portion of a 4by 5-inch negative or
casting.
a negative smaller than 4 by 5 inches is to be enlarged
(b) Hold the lens board of the
replacement projection lens so that
(1) PH-406 (fig. 23).
the straight sides are parallel to the
(a) Separate the upper plate from the
long sides of the baseboard.
lower plate.
(c) Insert the lens board in the focusing
(b) Lift the glass out of the lower plate.
casting, and turn it 1/4 turn to lock it
(c) Ease the glass past the retaining
in position. (If the lens board does
spring clips on the upper plate.
not turn easily, loosen the adjusting
(d) Clean both glasses with a camel's
screws.)
hair brush. If fingerprints or foreign
(2) EN-16(1) (fig. 3).
matter remains, wash each glass
(a) Loosen the thumbscrew (not shown)
and dry it with a soft, clean, lint-free
that holds the projection lens to the
cloth.
focusing assembly frame. (A clip
(e) Replace the glass in the lower plate
and
in
the
upper
plate.
27
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