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

Page scan 000706 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 #:
000706
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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690 RICHARDSON'S BLUEBOOK OF PROJECTION THE TROUBLE TESTS THE CONDITION FOUNDl NEXT ■ rEST • • • 26. Apply Tests 18 and 19, TROUBLE FOUND above Trouble not found No. 27 27. Apply Tests 15, 16 and 17, above, to all speech circuits of the amplifier TROUBLE CURED 28. Check for open grid circuit to tube or tubes showing improper grid bias TROUBLE FOUND 29. Check with headphones or Trouble localized No. 30 wide-reading volume indi Trouble not localizec No. 31 cator to find stage where hum originates 30. Check or replace decoupling resistor and condenser of faulty stage TROUBLE FOUND Hum remains No. 18 31. Apply Test No. 30, above, to all amplifier stages TROUBLE FOUND Hum remains 32. Check grid bias supply rec No. 18 tifiers Der Chart No. 6. TROUBLE FOUND No. 33 No grid bias supply rectifier No. 34 Grid bias supply rectifier 33. Check common grid bias normal resistor for open or high TROUBLE FOUND No 34 resistance contact, or for Common grid bias resistor unintended ground normal 34. Check line from common grid bias source for ground, open, or high resistance contact TROUBLE FOUND