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

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

SOUND TROUBLE-SHOOTING CHARTS 669 To Determine the Cause and Correction off HUM, ORIGINATING AT THE RECTIFIER THE TROUBLE TESTS THE CONDITION FOUND NEXT TEST '• • Install new tubes • TROUBLE CURED Hum remains • Test No. 2 2. Inspect output fuses for high resistance fuse or dirty contact TROUBLE FOUND All output fuses normal Test No. 3 3. Inspect condenser fuses All condenser fuses normal One condenser fuse open One condenser fuse high resistance No condenser fuses Test No. Test No. Test No. Test No. 7 5 4 7 4. Replace defective fuse TROUBLE CURED 5. Replace open fuse TROUBLE CURED New fuse won't hold Test No. 6 6. Replace associated condenser TROUBLE CURED 7. Check all condensers and associated wiring for open circuit TROUBLE FOUND Condensers and wiring normal Test No. 8 8. Clean and tighten all external grounds TROUBLE CURED, remains — If hum Test No. 9 9. Remove external ground connections one at a time TROUBLE CURED, remains — If hum Test No. 10 10. Tighten holding bolts of all transformers and choice coils TROUBLE CURED, remains — If hum Test No. II II. Check for grounded output voltage control resistor TROUBLE CURED, remains — If hum Test No. 12 12. Check for shorted or grounded choke coil TROUBLE FOUND