3M 9800 Service Manual - Page 46

M 9800 Service Manual

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9800 Overhead Projector Section 6 - Troubleshooting Symptom Horizontal Keystoning: Projected image is higher on one side than the other. Projected image is dim. Image is vibrating. Projected image does not have uniform brightness. Double images appear. Fan motor does not run but lamp illuminates. Things To Check Solution a. Image is offset because a. Rotate projector left or light beam is not projected right until image height is at 90_ angle to screen? equal on both sides. b. Are optical components in b. Align optical components proper alignment? to obtain the best image. a. Dirty stage glass, projec- a. Clean projector optics. tion lenses or mirror. b. Condenser lens bracket not b. Close condenser lens and closed. secure with retaining clip. c. Is internal voltage switch c. Set internal voltage switch set to low? to the high setting. d. Is Fresnel lens installed with bowed side facing stage glass? d. Seat Fresnel lens squarely in frame with bowed side up. a. Is fan mounted properly? a. Check vibration pads under fan bracket. b. Is fan motor running properly? b. Replace defective motor. c. Is fan blade or motor hitting an obstruction? c. Remove foreign objects from inside projector. a. Is lamp alignment correct? a. Seat lamp squarely on lamp socket. Fully engage lamp changer control. b. Is Fresnel lens installed with bowed side facing stage glass? b. Seat Fresnel lens squarely in frame with bowed side up. a. Is condenser lens installed a. Seat condenser lens in with the curved side facing bracket with the curved the hot mirror? side toward the hot mirror. a. Is fan blade or motor hit- a. Remove foreign objects ting obstruction? from inside projector. b. Is fan motor burned out? b. Replace defective motor. Section 2-3 4-2 3-1 2-6 5-4-3 5-2-2 5-5 5-5 1-2-2 4-2-1 2-4 5-2-2 5-3-3 5-5 5-5 3M 9800 Service Manual 6-3

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9800 Overhead Projector
Section 6 – Troubleshooting
6-3
3M 9800 Service Manual
Symptom
Things To Check
Solution
Section
Horizontal Keystoning:
Projected image is higher
on one side than the other.
a.
Image is offset because
light beam is not projected
at 90
_
angle to screen?
b.
Are optical components in
proper alignment?
a.
Rotate projector left or
right until image height is
equal on both sides.
b.
Align optical components
to obtain the best image.
2-3
4-2
Projected image is dim.
a.
Dirty stage glass, projec-
tion lenses or mirror.
b.
Condenser lens bracket not
closed.
c.
Is internal voltage switch
set to low?
d.
Is Fresnel lens installed
with bowed side facing
stage glass?
a.
Clean projector optics.
b.
Close condenser lens and
secure with retaining clip.
c.
Set internal voltage switch
to the high setting.
d.
Seat Fresnel lens squarely
in frame with bowed side
up.
3-1
2-6
5-4-3
5-2-2
Image is vibrating.
a.
Is fan mounted properly?
b.
Is fan motor running
properly?
c.
Is fan blade or motor
hitting an obstruction?
a.
Check vibration pads
under fan bracket.
b.
Replace defective motor.
c.
Remove foreign objects
from inside projector.
5-5
5-5
1-2-2
Projected image does not
have uniform brightness.
a.
Is lamp alignment correct?
b.
Is Fresnel lens installed
with bowed side facing
stage glass?
a.
Seat lamp squarely on
lamp socket.
Fully engage
lamp changer control.
b.
Seat Fresnel lens squarely
in frame with bowed side
up.
4-2-1
2-4
5-2-2
Double images appear.
a.
Is condenser lens installed
with the curved side facing
the hot mirror?
a.
Seat condenser lens in
bracket with the curved
side toward the hot mirror.
5-3-3
Fan motor does not run but
lamp illuminates.
a.
Is fan blade or motor hit-
ting obstruction?
b.
Is fan motor burned out?
a.
Remove foreign objects
from inside projector.
b.
Replace defective motor.
5-5
5-5