Philips DPTV305, Руководство пользователя

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D. Replacement of the CRT
1d) Remove CRT coupling fluid as described in steps 1b through 13b.
2d) Remove the plastic protective coating (if present) from the faceplate of the replacement CRT.
3d) Refer to "Replacing the CRT Coupling Fluid" to complete the CRT replacement.
E. Repair or Replacement of the Optical/Coupler Assembly
1e) Remove CRT coupling fluid as described in steps 1b through 13b.
2e) Remove the four inverted-type Torx screws which secure the Delta output lens to the coupler. An
inverted-type Torx socket can be purchased using part number 483539517303.
3e) Removal of the Delta output lens will allow access to the C-element lens, C-element gasket, coupler, and
its assemblies.
4e) Refer to "Replacing the CRT Coupling Fluid" upon completion of necessary repairs to the optical/coupler
assemblies.
F. Replacing the PTV Coupling Fluid
Note: Prior to replacing the CRT coupling fluid, ensure the expansion chamber bladder is fully collapsed. This
can be easily inspected by viewing the bladder through the small hole on the expansion chamber
assembly. If the rubber of the bladder is not easily visible through the small hole, then the bladder may be
considered collapsed and fluid can be added. If the rubber of the expansion chamber bladder is visible at
the hole of the expansion chamber, then replacement of the expansion chamber bladder is required.
Note: The CRT coupling fluid is critical to the optical performance of the PTV. Use only part number
483531057233 (3 bottle kit) or 483531067004 (1 bottle) to ensure the optical integrity and performance
reliability of the PTV when replacing the CRT coupling fluid.
1f) Reinstall the CRT gasket into the gasket channel of the coupler. Confirm the placement of the CRT, C-
element lens, and vent plug gaskets.
2f) Place the CRT onto the coupler with the high voltage anode lead positioned as marked in step 10b of
procedure B.
3f) Carefully position the CRT onto the coupler, using the outline defined in step 6b of procedure B as a
reference.
4f) Start the CRT mounting ear screws but do not tighten them.
5f) Tighten the CRT mounting ear screws in a star pattern (like tightening lug nuts on the wheel of a car).
Make sure the CRT does not shift position from the outline defined in step 6b.
Caution: Do not over tighten the CRT ear screws.
Note: The CRT mounting ear screws are not used on some assemblies.
6f) Install the CRT mounting bracket and start the four CRT mounting bracket bolts with springs.
7f) Tighten the bolts in a star pattern.
8f) Lay the CRT assembly on its side with the plug pointing up.
9f) Remove the plug.
10f) Using the PTV coupling fluid bottle with the cone top, refill the coupler with fluid through the drain access
hole. Completely fill the coupler chamber so the fluid is level with the top of the coupler at the plug. Wipe
any excess fluid from around the coupler.
11f) Reinstall the plug and check for any fluid leaks.
12f) Install the repaired CRT/optical block assembly into the PTV and perform any necessary adjustments.