COOL-DOWN   PERIOD   REQUIRED   FOR THIS MACHINE. Just turn on the power switch, make your print, and turn the machine off. This is  recommended  for  longer  machine  and  lamp  life. Making  prints  is  extremely  simple.  Place  your original tracing or transparency, face up, on the sensitized  reproducing  paper,  chemical  (yellow) side up. Adjust the leading edges of both papers so they are even, uncurled, and uncreased. THIS IS IMPORTANT! Place the two adjusted sheets on  the  feed  table  and  gently  feed  them  evenly into the printer entrance WITH THE GRAIN of the  sensitized  paper  (see  package  for  grain indication)  until  they  are  engaged  between  the rubber belts and the glass cylinder. If  for  any  reason  the  above  described  entrance of  the  paper  to  the  printer  is  erratic,  creased, wrinkled,  or  uneven,  turn  the  direction  knob  to reverse  and  the  papers  will  come  out  of  the printer. As the original and printed sensitized paper exits  from  the  printer  over  the  top  of  the  glass cylinder, manually separate the sensitized paper from  the  original  tracing. Turn  the  sensitized  paper  up  and  into  the entrance  of  the  ammonia  developing  chest.  The finished  print  will  exit  from  the  top  of  the machine. If your print is too light, turn the speed knob to a higher number; if too dark, turn to a lower number. The  interior  of  the  ammonia  chest  of  the Blu-Ray   machine   is   readily   accessible   for inspection  or  removal  of  jammed  paper.  Using finger catches on the top of the machine, lift up the top cover, and the upper chest panel will be exposed.   (Before   opening,   SEE   WARNING below.)  Two  sliding  door  latch-type  fasteners  hold the upper chest panel in its closed position. Slide these  door  latches  toward  the  center  of  the machine, and open the upper chest panel up and back,  exposing  the  interior  of  the  ammonia chest. WARNING DO   NOT   OPEN   THE   AMMONIA CHEST   WHILE   THE   MACHINE   IS RUNNING. Be sure that all ammonia has drained  from  the  machine.  Stand  back from the machine when the chest is open. There is a heavy charge of ammonia in the chamber.  Be  sure  to  provide  ventilation  at all times when the ammonia chest is open. When   removing   jammed   paper   from   the ammonia chest, do not bend or scratch any of the mechanical parts in the chest. Because of described qualities of the aqueous ammonia, it is important that a NITE-SHEET be run in the developer section when the machine is not  in  operation  for  a  period  of  time  (nights, weekends, etc.). This nite-sheet can be a wide sheet of  sensitized  paper  long  enough  to  extend  from both   the   entrance   and   exit   of   the   developer section.  Stop  the  machine  when  this  is  accom- plished, allowing the sheet to remain. This sheet will  absorb  the  excess  vapor  and  condensation, leaving a dry chamber when the machine is started again. MAINTENANCE.—   Periodic   maintenance and  inspection  of  the  Blu-Ray  machine  are essential. Major maintenance and repairs should be  performed  only  by  skilled  service  personnel. For   maximum   light   exposure,   it   is   very important  that  the  exterior  and  interior  of  the glass  cylinder  be  cleaned  frequently.  When  the glass cylinder needs to be cleaned, follow the steps given  below. 1.   Disconnect   the   electrical   cord   from   its power  source. 2. Remove both end panels from the machine by  removing  the  panel-holding  screws. 3.  Back  off  the  locking  screw  and  open  the drive-section  cover. 4. Disconnect the lamp cartridge wiring. DO NOT  PULL  THE  WIRES;  grasp  the  plug. 5.  Unfasten  the  lamp  cartridge  by  removing the  screws  at  the  right-hand  end  of  the  lamp cartridge   frame. Gently   remove   the   lamp cartridge,  ensuring  that  the  wires  at  the  left-hand end  of  the  cartridge  do  not  snag. 6.   Thoroughly   clean   the   glass-printing cylinder  and  lamps.  Use  the  manufacturer’s recommended  glass  cleaner  or  an  ammonia-water solution. NEVER use an abrasive cleaner on the glass cylinder. It is inherent in the nature of fluorescent lamps to  lose  brilliancy  after  months  of  usage.  This requires  the  machine  to  be  slowed  down  to produce the desired prints. When this occurs, the lamps should be replaced, Since the lamp cartridge must  be  removed  when  the  glass-printing  cylinder interior  is  being  cleaned,  burned  out  or  weak lamps  should  be  replaced  at  the  same  time. Lamps,  as  well  as  any  other  parts  needed,  should be  obtained  through  your  supply  system. 3-44