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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 #:
000705
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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TROUBLE-SHOOTING CHARTS 689 THE TROUBLE TESTS • 12. Check amplifying tube plate voltages at sockets 13. Check grid bias voltages at amplifying tube sockets 14. Using headphones or widereading volume indicator, check to find stage where hum originates 15. Visually and manually inspect trouble area for accidental grounds (including faulty insulation), loose ground contacts, faulty contacts or misplaced wiring; check or replace decoupling condensers 16. Replace doubtful sockets in trouble area 17. Resolder al trouble area contacts 18. Investigate electrical machinery in and near theatre for newly developed faults 19. Correct faulty machinery, apply hum filter to it, apply hum filter to amplifier, or change amplifier to another power circuit 20. Check filter condensers for open or leakage 21. Replace filter condensers 22. Check for grounded output voltage control resistor 23. Check for shorted or grounded choke coil 24. Check all amplifier rectifying circuits for open, grounded or shorted lines, including faulty soldered contacts and defective insulation 25. Apply Tests 20, 22, 23 and 24, above THE CONDITION FOUND Voltages normal Voltages abnormal All voltages normal All voltages abnormal One or more voltages abnormal Trouble localized Trouble cannot be localized TROUBLE FOUND Trouble not found TROUBLE CURED Hum remains TROUBLE CURED Hum remains Hum source found Trouble source not found TROUBLE CURED TROUBLE FOUND No trouble found Condenser tester not available TROUBLE CURED Hum remains TROUBLE FOUND urn remains TROUBLE FOUND Hum remains TROUBLE FOUND TROUBLE FOUND Trouble not found NEXT TEST • No. 13 No. 20 No. 14 No. 32 No. 28 No. 15 No. 25 No. 16 No. 17 No. 18 No. 19 No. 20 No. 22 No. 21 No. 22 No. 23 No. 24 No. 26