Servicing projection equipment (1932)

Page scan 000107 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000107
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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SPARKING 91 best you can until its condition compels replacement. (k) — Sparking may also be due to high resistance in the brushes. If they overheat and crumble get a better quality or a different grade and always follow the maker's instructions. (1) — Worn, low bearings will allow the armature to be out of horizontal, or out of vertical, according to the type of set employed. Note if the airgap is equal and even all around, between the rotor and the stator. If this fault cannot be corrected, replace the bearings. (m) — The armature coil may be short-circuited. Obvious signs of this trouble are a badly fluctuating voltmeter and a hot coil. Locate and remove the short-circuit. (n) — An armature coil may be reversed. This should be tested by holding a magnetic compass over the coils and noting if one deflects it opposite to the direction the others deflect it. When making the test have the brushes raised and use battery current. The coil which alters the compass direction opposite to that of its mates, must be reversed. (o) — The armature shaft may be bent. Note its steadiness of torque and see if it binds. The repair or replacement of this part is a very delicate job and expert advice should be solicited.