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

Page scan 000717 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 #:
000717
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 701 THE TROUBLE TESTS THE CONDITION FOUND NEXT TEST 24. • Overhaul arc feed motor and connections, filtering if necessary • TROUBLE CURED • 25. Check if heard with projector motor not running Hum not heard Hum unchanged No. 26 No. 27 26. Overhaul projector drive motor and circuits TROUBLE CURED 27. Check PEC amplifier plate circuit condensers and resistors for breakdown permitting amplifier to oscillate TROUBLE FOUND 28. Turn on amplifiers one at a time, beginning with output amplifier, to isolate hum. Leave sound input switched off Faulty amplifier found Hum not heard No. 29 No. 30 29. Check faulty amplifier per Chart No. 16 TROUBLE FOUND 30. Apply Tests No. 20 and 21, above TROUBLE CURED