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

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 #:
000681
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:
June 04, 2024
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SOUND TROUBLE-SHOOTING CHARTS 665 To Determine the Cause and Correction of DISTORTION, FAULT LOCATION UNKNOWN THE TROUBLE TESTS • Check all installed meters, all signal lamps, brightness of all filaments (including exciter) and all switch and control settings 2. Check faulty unit per Charts Nos. 10, 13, 17 or 19 3. Correct faulty setting 4. Check if distortion is present with other projector working 5. Proceed per Chart No. 10 6. Listen to determine if distortion is type attributable to improper volume distribution between h.f. and l.f. speakers 7. Check field excitation to l.f. and h.f. speaker banks 8. Check field supply rectifier per Charts Nos. 4, 5 or 12 9. Using ohm meter, check l.f.h.f. filter network wiring and parts, changing condensers if condenser tester is not available 10. Using headphones, check sound at output of each amplifier I I. Proceed per Chart No. 17 12. Proceed per Chart No. 19 THE CONDITION FOUND • All indications normal Meter reading wrong Tube filament too bright (or too dim) Exciter filament too bright or too dim Signal lamp indication wrong Control setting found incorrect TROUBLE FOUND TROUBLE CURED Distortion in one projector only Distortion same, either proprojector TROUBLE FOUND L.f.-h.f. volume distribution faulty L.f.-h.f. volume distribution not involved No separate l.f.-h.f. speaker systems Field excitation values wrong No fault, field excitation TROUBLE CURED TROUBLE FOUND No fault in filter network Faulty amplifier located No fault in amplifying system TROUBLE FOUND TROUBLE FOUND NEXT TEST • No. No. No. 4 2 2 No. 5 No. No. 3 3 No. 5 No. 6 No. 7 No. 10 No. 10 No. No. 8 9 No. 10 No. M No. 12