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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 #:
000701
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 TROUBLESHOOTING CHARTS 685 15. To Determine the Cause and Correction of LOW VOLUME, DUE TO AMPLIFIER TROUBLE THE TROUBLE TESTS • 1. Observe all tube filaments 2. Observe volume control setting 3. Check if volume control knob is tight on shaft 4. Check reverse feedback setting 5. Change all tubes 6. Check all plate voltages at sockets 7. Check all screen voltages a\ sockets 8. Check all grid voltages at sockets (use only very high resistance voltmeter, or figure in current drain of meter used) 9. Check all heater (filament) voltages 10. Check with high resistance headphones to find stage where volume is lost 11. Visually inspect all connections and insulation in trouble area, tug wires, clean contacts, including tube socket and grid clip contacts 12. Using ohmmeter, check speech circuit parts in trouble area for internal open, ground, short or partial short THE CONDITION FOUND • All filaments lit One tube out NEXT • No. No. TEST 2 14 Setting normal Setting low No. No. 3 17 Knob tight Knob loose No. No. 4 18 Setting normal Setting low No reverse feedback No. No. No. 5 20 5 TROUBLE CURED Low volume continues All voltages normal All plate voltages low One or more plate voltages low All screen voltages normal All screen voltages low One or more screen voltages low All grid voltages normal All grid voltaoes high One or more grid voltages high Ml heater voltages normal All heater voltages low One or more heater voltages low Trouble is localized Trouble cannot be localized TROUBLE FOUND Trouble not found TROUBLE FOUND Trouble not found No. 6 No. 7 No. 23 No. 24 No. 8 No. 23 No. 24 No. 9 No. 26 No. 28 No. 10 No. 23 No. 24 No. II No. 21 No. 12 No. 13