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SERVICING THE CRT/OPTICAL ASSEMBLY
The following procedures describe how to service the Delta 77/78 CRT/Optical block used in
the PTV 700 Series Chassis.
NOTE: DO NOT ATTEMPT ANY REPAIRS ON THE CRT/OPTICAL BLOCK ASSEMBLY
WITHOUT FIRST REMOVING THE CRT COUPLING FLUID! REMOVAL OF THE DELTA
OUTPUT LENS WILL RESULT IN SPILLAGE OF THE COUPLING FLUID!
CAUTION; Coupling fluid is a Poisonous Solution containing a High Concentration of
Ethylene Glycol. Do not leave exposed fluid unattended. Prevent Children or Pets from
coming in contact with the fluid. Clean up spills immediately.
Removing The PTV Coupling Fluid
All repairs made to the CRT/Optical Block assembly will require the Coupling Fluid to be
removed. The following procedure describes how to remove the PTV Coupling Fluid.
1b) Lay the CRT assembly on its side with the drain plug pointing up.
2b) Remove the Drain Plug (1/4 turn to release).
3b) Remove some of the fluid from the coupler to prevent spillage when the CRT is removed.
An empty Coupling Fluid Bottle with a Cone Top is recommended to lower the fluid level within
the coupler. Squeeze and hold the bottle and insert the tip of the cap into the drain hole of the
coupler. Loosen the grip on the bottle allowing the fluid to be pulled up into the bottle. Save the
fluid.
4b) Re-install the drain plug.
5b) Stand the CRT assembly up with the neck of the CRT pointing up.
6b) With an awl or marking pen, outline the edges of the CRT onto the coupler. Note: THE
CORRECT POSITIONING OF THE CRT TO THE COUPLER IS CRITICAL TO THE
OPTIMUM PERFORMANCE OF THE OPTICAL SYSTEM!
7b) Remove the 4 CRT mounting bolts (with springs and spacers) and remove the mounting
bracket.
8b) Remove the 4 CRT mounting ear screws. Note: Some CRTs do not use the four CRT to
Coupler screws.
9b) Gently remove any metal shavings from around the screw holes. Do not allow the metal
shavings to get into the fluid.
10b) Note the position of the High Voltage Anode Cap with respect to the Coupler.
11b) Carefully remove the CRT from the Coupler. Wipe excess fluid from the faceplate of the
CRT. Set the CRT aside.
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