F. H. Richardson's bluebook of projection (1942)

Page scan 000713 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000713
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
July 11, 2024
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SOUND TROUBLE-SHOOTING CHARTS 697 19 To Determine the Cause and Correction of DISTORTION. ORIGINATING AT A SPEAKER NOTE: If any test from No. 10 to No. 19 cannot be carried out because of the nature of speaker construction or through lack of suitable facilities such as centering shims, a simpler but more expensive remedy is afforded by No. II. 2. Wrap vibrating guy in rags, ozite or flannel over a fair portion of its length 3. Similarly check baffle, horn | or trumpet for sympathetic vibration of any part, attachment or mounting fixture 4. Thoroughly tighten down vibrating part 5. Wrap or wedge vibrating part to prevent vibration. 6. Replace vibrating part 7. Check whether speaker unit is tightly mounted to baffle 8. Tighten unit on baffle 9. Examine speaker terminal strip for loose connections 10. 13. Test speaker field coil and hum-bucking coil (if any) with ohm meter for imperfect continuity Replace speaker unit Test voice coil with ohm meter, simultaneously vibrating diaphragm (if possible) by hand Replace voice diaphragm coil ind TROUBLE CURED Vibration found No vibration found TROUBLE CURED Part cannot be tightened TROUBLE CURED Vibration cannot be prevented TROUBLE CURED Mounting tight Mounting loose TROUBLE CURED TROUBLE FOUND All connections tight Intermittent open or .short No trouble found TROUBLE CURED Intermittent open or Short No trouble found . TROUBLE CURED NEXT rE • No. 2 No. 3 THE TROUBLE TESTS THE CONDITION FOUND • • Examine all speaker guy Speaker guy vibrating wires, ropes or supporting No vibration found cables for sympathetic vibration, touching or grasping them and listening for any resulting changes in the distortion No. No. No. No. No. 5 No. No. 10 No. II No. 12 No. 13 No. 14