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Decoating Optical Components (cont) - TM-9-254_294
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Decoating Optical Components (cont) - TM-9-254_296
TM 9-254 9-9. Coating Optical Components - Continued (20)  Press  and  release  METER  READ  switch  (9)  then  adjust  ZERO  SET  knob  (8)  for  0  indication  on DISCHARGE GAUGE (4). (21)  Place range selector switch (24) to the 10-4 position.  If indication on DISCHARGE GAUGE (4) is above 1, let unit pump down until indication of 1 or less than 1 is obtained. (22)  Place  range  selector  switch  (24)  to  the  10-5  position  and  monitor  DISCHARGE  GAUGE  (4)  for  an indication of 5 or less. NOTE Do   not   proceed   to   step   (23)   until   the   SUBSTRATE   TEMPERATURE   GAUGE   (2)   indicates   a temperature of not less than 400 degrees Fahrenheit and the DISCHARGE GAUGE (4) indicates 5 or less. (23)  Rotate FILAMENT ADJUST knob (23) fully counterclockwise and set FILAMENT PWR switch (12) to the ON position. WARNING To  prevent  injury  to  the  eyes,  always  wear  welding-type  goggles  when  observing  filament  for spattering. (24)  While  observing  filament  (8,  fig.  9-31)  slowly  rotate  the  FILAMENT  ADJUST  knob  (23)  clockwise  until spattering occurs.  Then slowly rotate FILAMENT ADJUST knob counterclockwise until spattering stops. NOTE During  the  coating  process,  observe  the  reflection  of  the  heat  lamps  on  the  lens  elements.    The lens elements will change colors as the thickness of the coating increases.  The desired thickness of  coating  has  been  obtained  when  the  reflection  on  the  lens  elements  turns  purple  to  bluish- purple in color.  (550 to 600 millimicrons). (25)  Start the coating process by positioning the spatter shield lever (21) to the left. (26)  When  the  desired  thickness  of  coating  is  obtained,  the  coating  process  is  stopped  by  positioning  the spatter shield lever (21) to the right. (27)  Rotate  FILAMENT  ADJUST  knob  (23)  fully  counterclockwise  and  turn  FILAMENT  PWR  switch  (12)  to the OFF position. (28)  Rotate HEATER ADJUST knob (3) fully counterclockwise and turn range selector switch (24) to the OFF position. Change 2  9-33

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