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Decoating Optical Components (cont) - TM-9-254_293
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Decoating Optical Components (cont) - TM-9-254_295
TM 9-254 9-9. Coating Optical Components - Continued KEY to figure 9-31: 1. Bell jar 2. Holding fixture cover 3. Holding fixture 4. Support ring 5. Baseplate 6. Adjustable turntable 7. Crucible 8. Filament 9. Splatter shield CAUTION Allow  approximately  12  minutes  for  the  diffusion  pump  to  reach  operating  temperature  after  the power has been applied.  This will prevent internal damage to the diffusion pump. (15)  Turn DP WATER valve (16) fully counterclockwise and place DIFF PUMP switch (13) to the ON position. (16)  Turn BACKING VALVE (18) fully clockwise to the closed position.  Turn ROUGHING VALVE (19) fully counterclockwise to the open position. NOTE THERMOCOUPLE GAUGE (5) should indicate approximately 50 microns before proceeding to next step. (17)  Rotate  ROUGHING  VALVE  (19)  fully  clockwise  to  the  closed  position.    Rotate  BACKING  VALVE  (18) fully counterclockwise to the open position.  Set THERMOCOUPLE switch (7) to the TC 2 position and place HIGH VACUUM VALVE (20) to the up position. NOTE o     Coating   can   not   be   applied   to   lens   elements   until   SUBSTRATE   TEMPERATURE   GAUGE indicates a temperature of at least 400 degrees Fahrenheit. o     If indication on SUBSTRATE TEMPERATURE GAUGE exceeds 450 degrees Fahrenheit, adjust the HEATER ADJUST knob counterclockwise to reduce temperature. (18)  Place  HEATER  PWR  switch  (11)  to  the  ON  position  and  rotate  the  HEATER  ADJUST  knob  (3)  fully clockwise.    Monitor  SUBSTRATE  TEMPERATURE  GAUGE  (2)  for  an  indication  of  not  less  than  400 degrees Fahrenheit and not more than 450 degrees Fahrenheit. (19)  Place range selector switch (24) to the ZERO position. NOTE Allow 30 seconds for cold cathode tube to reach operating temperature before proceeding to next step. 9-32

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