Dukane 28A33 서비스 및 부품 매뉴얼 - 페이지 3

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Before the check out procedure begins, it is recommended that a complete mechanical

inspection be given to the defective unit. The following list represents a few of the leading

mechanical failures due to abusive shipping and handling.

Loose screws and mounting hardware.

2 .

Broken wires.

3 .

Lenses out of position.

Projection lamp loose in socket.

4 .

Focus wheel jammed.

5 .

Mechanical Test:

Insert any 35mm filmstrip into the top of the filmstrip carrier.

filmstrip, advance the filmstrip by turning the advance knob counterclockwise. Use the

framing knob to frame the picture.

advance controls.

Turn focus knob to move lens to its maximum out position; the lens should stop and

not fall out of the unit. Next

making sure no binding occurs.

#3-29 is dry and free from lubrication.

Electrical Test:

Plug power cord into 120 V., 60 Hz outlet. Note: Model 28A37 requires a

240 VAC, 50/60 Hz supply. Place the power switch (S1) in the "Fan " position. Only

the fan motor should operate with a minimum of mechanical noise. In the "Lamp" position

both the projector lamp and the fan motor should operate.

Optical Test:

Install test film into projector and project an 18" picture. Note: A 12" picture

for the 28A34. Center picture using framing lever and advance picture through several

frames. The image when focused should be essentially free of spherical or chromatic

aberrations over complete format with just one focus setting.

+ l / 2 % &

If picture is not clear, make sure the condenser lenses (Fig. l-47, l-50 or 3-52,

3-53) are properly seated and the lens system is relatively clean.

The aperture glass (Fig. l-548 or 3-63A) may be removed for easy cleaning. When

cleaning the lenses and aperture glass, use a lens tissue or soft line-free cloth.

SERVICE NOTES

There should be no excessive binding in the framing or

move,

in the opposite direction, lens to the in position

If focusing knob seems to slip, make sure Item #l-37 or

Pushing down on the

Distortion should not exceed