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674
RICHARDSON'S BLUEBOOK OF PROJECTION
10
To Determine the Cause and Correction of DISTORTION, ORIGINATING AT THE HEAD
THE TROUBLE TESTS
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1. Check exciting light focus
2. Check p.e.c. voltage with very high resistance meter, or ahead of p.e.c. load resistor with low resistance meter Replace p.e.c.
3.
4.
Make and run a test loop of sound print (not frequency film), thus eliminating the take-up action, and listen for distortion
5. Adjust, lubricate, repair or replace take-up
6. Check for and eliminate all other causes for unsteady film motion, small side-sway, etc., interchanging projector heads and mechanical drives of sound heads if necessary
7. Using high resistance ohm meter check p.e.c. output circuits, load resistor, transformer, etc., for partial short or ground
8. By visual inspection, ohm meter, tugging wires and replacement of parts if necessary, check between p.e.c. output and head output
9. Proceed per Chart No. 7.
10. Replace p.e.c.
11. Proceed per LOW OUTPUT chart, page 37, Better Theatres for April 2
12. Adjust focus
J 3, Proceed per Test No. 9 Chart No. 9.
THE CONDITION FOUND
Focus correct Focus poor
Voltage normal Voltage high Voltage low
TROUBLE CURED
No improvement found
No distortion heard Distortion remains
TROUBLE CURED
TROUBLE FOUND Trouble not mechanical
TROUBLE FOUND No trouble found
TROUBLE FOUND
TROUBLE CURED Distortion remains
TROUBLE CURED TROUBLE CURED
TROUBLE CURED Good focus unobtainable
TROUBLE CURED
NEXT TEST
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No. 2 No. 12
No. 3 No. 9 No. II
No. 4
No. 5 No. 6
No.
No. 10
No. 13