Philips PTV800 Service Manual page 66

Repair or Replacement of The Optical/Coupler Assembly
1e) Remove PTV Coupling Fluid as described above in steps 1b through 13b of the "removing
PTV Coupling Fluid " procedure.
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 under part number
483539517303.
3e) Removal of the Delta Output Lens will allow access to the C-Element, C-Element Gasket,
Coupler and its assemblies.
4e) Refer to the "Replacing the PTV Coupling Fluid " procedure upon completion of necessary
repairs to the Optical/Coupler assemblies.
Replacing The PTV Coupling Fluid
Note: Prior to replacing the PTV coupling fluid insure the expansion chamber bladder is
fully collapsed. This can easily be inspected by visually 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 consider the bladder 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 will be
required.
Note: The CRT coupling fluid is critical to the optical performance of the PTV. Use only
part number 4835 310 57233 (3 bottle kit) or 4835 310 67004 (single bottle) to insure the
optical integrity and performance reliability of the PTV when replacing the PTV Coupling
Fluid.
1f) Re-install the CRT gasket into the gasket channel of the coupler. Confirm the placement of
the CRT, C-Element and vent plug gaskets.
2f) Place the CRT onto the coupler with the High Voltage Anode lead positioned as marked in
step 10b of the previous procedure.
3f) Carefully position the CRT on the coupler using the outline as defined in step 7b in the
previous procedure as reference.
4f) Start the CRT mounting ear screws but do not tighten.
5f) Tighten the mounting ear screws in a star pattern ( like tightening lug nuts on a car ). Make
sure the CRT does not shift position from the outline used as a reference in step 6b.
CAUTION: DO NOT OVERTIGHTEN THE CRT EAR SCREWS! Note: Some assemblies will
not have the CRT mounting ear screws present.
6f) Install the CRT mounting bracket and start the 4 CRT mounting bracket bolts with springs.