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

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SOUND TROUBLE-SHOOTING CHARTS 667 THE TROUBLE TESTS THE CONDITION FOUND NEXT TEST • • • 12. Replace tubes TROUBLE CURED New tubes won't light Test No. 13 New tubes burn out Test No. 17 13. Check filament or line fuse Fuse out Test No. 14 Fuse good Test No. 16 14. Replace fuse TROUBLE CURED Fuse won't hold Test No. 15 15. Check between fuse and tube filaments for short circuit TROUBLE CURED 16. Check between fuse and tube filaments for open circuit TROUBLE CURED 17. Replace filament transformer TROUBLE CURED