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TROUBLESHOOTING
Principles of operation

Engineering Aid 3 - Beginning Structural engineering guide book
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Starting or stalling difficulties: 1.  Voltage  too  low. 2.  Machine  not  level,  causing  binding. 3.  Wiring  loosened  or  disconnected.  Call dealer. Ammonia  leakage: 1.  Developer  chamber  top  not  properly latched  after  inspection. 2.  Ammonia  drain  tube  locked. 3.   Machine   not   level,   preventing   proper drainage. 4.  Ammonia  bottle  improperly  capped. 5.  Ruptured  pump  tubing. Wrinkled  prints  from  developer  jamming: 1.  Condensation  in  ammonia  chest. 2.  Did  not  use  nite-sheet. 3.   Sensitized   paper   damp   before   using, because  of  humid  storage. 4. Paper placed in developer chamber against the grain. 5.  Foreign  material  in  developer  chamber. 6.  Exit  not  clear. Lamps  burn  out  prematurely: 1.  Improper  voltage. 2.  Air  entrance  blocked  causing  hot  lamps. 3.  Improper  or  defective  starters. 4.  Shorting  in  wiring. Prints  do  not  develop: 1.  Weak  or  exhausted  ammonia—replace. 2.  Sensitized  paper  old  or  exposed. 3.  Ammonia  pump  not  operating  properly— infeed  tube  kinked  or  pinched. 4.  Cold  ammonia  in  supply  bottle. Ozalid Every EA should have a basic understanding of the various functions of the Ozalid (fig. 3-62); therefore, in this section we will discuss printing and developing, as well as the operating principles of  the  cooling  and  exhaust  system.  Information is also given on machine operation, adjustments, and maintenance. PRINTING SECTION.— Figure 3-63 shows the  principles  of  operation  of  the  printing  and 45.296 Figure 3-62.-Ozalid machine. developing   sections.   Of   particular   interest   at this  point  is  the  printing  section.  This  section is  divided  into  four  basic  units:  light  source, reflector  assembly,  printing  cylinder,  and  feed belts. During the reproduction process, the original and a piece of material, such as paper that has been sensitized (coated with a light, sensitive dye), are  inserted  into  the  machine.  Sensitized  material is placed with the emulsion side up on the feed- board,  and  the  original  is  placed  on  top.  Originals should be of a transparent or translucent nature with an opaque image on one side only. Feed belts carry this material around the revolving printing cylinder where the dye of the treated paper that is  NOT  covered  by  the  opaque  image  of  the original is desensitized by the ultraviolet light rays emitted   from   the   mercury-vapor   lamp.   After exposure, the original and print are picked off of the printing cylinder by the pick-off assembly, and directed  towards  the  developing  section. After  pick-off,  the  guide  roller  directs  the original and print between a printer and tracing separator belt. These belts cause the print and the original  to  be  delivered  to  two  separator  tank assemblies   where   the   original   and   print   are separated  from  each  other. The  process  of  separation  is  unique  and  is therefore  worthy  of  further  discussion.  Critical to the operation of separation are perforations in the  walls  of  the  two  separator  tanks.  During 3-46







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