It is recommended that the lamp starters be replaced when the lamps are being replaced. The lamp starters are located in the ballast panel in the back of the machine. For ease of removal and replacement, a portion of the ballast panel cover must  be  removed  to  expose  the  starters. Printer  feed  belts  may  become  slack  over  a period   of   time,   causing   slippage   and   blurred prints.  A  simple  adjustment  may  be  made  as follows: 1.  Pull  the  small  Tygon  tube  out  of  the ammonia  supply  bottle  cap. 2. Run the machine until the tube is pumped dry and no longer feeding the ammonia tank in the machine. 3. Raise the motor end of the machine a few inches  for  a  moment  for  complete  drainage. 4.  Shut  off  the  machine. 5.  Tip  the  machine  on  its  back  carefully  so the ammonia tubes and power cord that project from the back will not be crushed or kinked. This will  expose  the  two  slotted  idler  take-up  brackets. 6.  Loosen  the  two  screws  in  both  brackets, and  press  down  approximately  one-fourth  in, beyond   the   previous   setting   to   give   proper tension to the belts, and re-secure. Make sure that both  brackets  are  set  at  the  same  position. The  components  in  the  ammonia  chest  are readily  accessible  and  easily  removed.  The  top cover is removed by sliding a door-catch type of pivot and then lifting it off of the machine. The back chest panel can be removed independently for  internal  inspection  by  removing  four  screws and sliding the panel out of the machine. Both the upper and lower paper combs are attached to the back  chest  panel,  allowing  for  inspection  and replacement  of  their  combs  when  the  panel  is removed. Take out the ammonia tank first. The ammonia  tank  is  independently  removed  from  the ammonia chest by removing the two wing screws on the right-hand end of the machine where the tank drains. Disconnect the Tygon ammonia in- feed tube in the motor end of the machine, and slide the tank out to the right. The grid and drive roll  assemblies  are  easily  removed  as  a  unit  by unscrewing the plastic drive-roll plug at the right end  of  the  drive  roll.  Slide  the  drive  roll  off  of a  pin  slot  connector  to  the  drive  shaft,  and  lift the  assembly  up  and  out  of  the  chest. After  600  hr  of  operation,  the  plastic  Tygon tube  in  the  ammonia  pump  will  need  to  be replaced.  Extra  tubing  is  supplied  with  the machine  for  this  purpose.  To  replace  a  tube, remove the left-hand end panel by removing the screws holding down the drive-section top cover. This will expose the pump with its motor and all the tube connections. Study how the tube is placed so that after it is removed you can place the new tube  properly. There is a tube coupling on the tube support bracket. Pull the tube lead to the pump from the coupling. Jog the machine by snapping the power switch ON and OFF. The old tube will move out of the pump by normal rotating pump action. Pull this tube  off  of  the  ammonia  feed  pipe  leading  into the  machine. Take  a  piece  of  replacement  tubing  and  cut the end on a bias (slant) so it will feed through the  pump  smoothly.  Feed  the  tubing  into  the coupling  end  of  the  pump  and  jog  the  machine (as before) so the tube will be pulled through the pump. When  this  tube  is  completely  in  the  pump,  cut it to length and reattach as before to the ammonia coupling  and  ammonia  feed  pipe. The  upper  faceplate  and  the  developer  feed plate  extrusions  are  removed  by  removing  two screws  from  each  and  lifting  them  off  of  the machine.  This  will  expose  the  lower  slider  gasket. The lower slider gasket is attached to the gasket retainer  angle  and  is  removed  as  a  unit  by removing  the  fastening  screws.  A  replacement gasket unit can then be inserted. TROUBLESHOOTING.—   If  the  Blu-Ray machine is to operate at peak efficiency, it must be  kept  in  proper  working  order.  In  trouble- shooting the machine, use the following summary as a guide: Loss  of  printing  speed: 1. 2. 3. 4. 5. 6. 7. 8. Glass  cylinder  dirty. Voltage  too  low. Fluorescent lamps dirty or past useful life. Overage sensitized paper. Machine  not  level,  causing  binding. Printer  drive  belts  loose. Air   entrance   blocked,   causing   lamp heating. Flickering   or   burnt-out   lamp,   check starters. 3-45