Elmo ST-1200 - 3. SOUND LENS (Fig. 17)

3. SOUND LENS (Fig. 17)
1
4
Fig. 17
REPLACEMENT
1. Remove Exciter lamp.
2. Remove Pad roller lever. (Refer to page 18)
3. Loosen attaching screw (Fig.17-1) and pullout Sound lens assy.
Insert replacement Sound lens assy of which window to be parallel to the
optical axis as illustrated (Fig.17-4).
4. Install Exciter lamp.
5. Light Exciter lamp and first loosen attaching screws (Fig.17-2,x2)
slightly and either tighten or loosen attaching screw (Fig.17-3) to
adjust the slit image through Sound lens can be screened in the center
of Silicon photo diode.
6. Attach Pad roller lever.
7. Pass the optical focusing test film (4000 Hz).
8. Connect both the resistor (8 ohms, lOW) and the voltage meter
(AC 10V max.) parallel to the output terminals of the amplifier
(Extension speaker cord terminal).
9. Run the projector, move Sound lens back and forth to search the position
where the output voltage is maximized, under Volume control knob
positioned somewhat below max.
10. Secure all the attaching screws by screw-tight.
-17-