Servicing projection equipment (1932)

Page scan 000108 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000108
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:
August 15, 2024
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92 SPARKING (p) — A continuous, sustained overload will also cause this trouble. Check the meters if they seem to be reading normally, although the trouble develops and continues. (q) — Kunning the motor at an excessive speed will cause sparking, therefore the speed should be reduced. (r) — This may also be due to a weak field. Look under heading, Starting Troubles, section 4 (Set Does Not Pick Up Readily). (s) — A shaky floor and loose bolts to the bed or the base, which permit considerable vibration, can assume proportions sufficient to cause sparking. Test these parts and correct them if necessary. (t) — If a ring of fire is visible around the commutator it is probably due to a neglect of cleaning. In this case a compound of oil, brush carbon, and dirt has, undoubtedly, bridged itself between two adjacent commutator bars. Stop the set and clean it. (u) — A bit of metal dragging across the bars. Examine the parts closely before looking any further. (v) — A broken wire in the coil or a break in the connection leading from the armature to the commutator. This break in the connection is due to its being burnt off by excessive currents.