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

Page scan 000710 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 #:
000710
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
Date Added:
May 02, 2025
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694 RICHARDSON'S BLUEBOOK OF PROJECTION 18 To Determine the Cause and Correction of NO SOUND, DUE TO TROUBLE BACKSTAGE THE TROUBLE TESTS THE CONDITION FOUND NEXT TEST • • l 1. Examine speaker cable plugs TROUBLE FOUND Plug connections okay No. 2 No speaker cable plugs No. 2 2. Check speaker field fuses Fuse (or fuses) out No. 3 Fuse good No. 8 3. Replace burnt-out fuse TROUBLE CURED New fuse does not hold No. 4 New fuse holds, no sound No. 8 4. Using test meter, check Short found No. 5 speaker field lines for par No short found No. 13 tial or complete short cir cuit, disconnecting parallel circuits if necessary 5. Disconnect shorted line from Short in speaker unit No. 6 fuse box, run show if pos Short in speaker cable No. 15 sible, disconnect shorted line at speaker terminals and check line and speaker separately for short 6. Inspect unit at field input TROUBLE FOUND connections for ground to No trouble found No. 7 frame 7. Replace unit TROUBLE CURED 8. Check field voltage at connection box Voltage normai (approximately) No. 9 Voltage very low or zero No. 18 9. Using headphones, check Speech input normal No. 10 speech input at connection No speech input No. 20 box 10. Check field voltage at speaker units Voltage normal (approximately) No. II No field voltage No. 22 II. Using headphones, check Speech input normal No. 12 speech input at speaker unit No speech input No. 23 12. Disconnecting lines, test speaker field and voice circuits for open; repair or replace TROUBLE CURED 13. Check field voltage at con Voltage normal No. 14 nection box Voltage high No. 24 14. Replace fuse again, using TROUBLE CURED ( slightly larger size