Specifications

Mechanical Instructions
EN 7DPTV585 AA 4.
4.1.6 Side Jack Panel Removal
1. Remove the Left Side Back Cover (see procedure above
excluding the Module Bracket removal).
2. Remove two screws from the panel.
3. Slide the Side Jack Panel PWB out of the bracket.
4.1.7 PIP Panel Removal (if present)
1. Remove the rear Jack Panel cover (76).
2. Remove three screws from the PIP panel.
4.1.8 Small Signal Board Removal (SSB)
First, remove the Module Bracket (see the chapter “Small
Signal Module Removal”).
1. Release the metal retainer clips, located at the front and
rear edges of the SIMM connector.
2. Tilt the SSB to the right and then pull it up.
4.1.9 Convergence Panel Removal (ACS)
First, remove the Module Bracket (see the chapter “Small
Signal Module Removal”).
1. Carefully pull the ACS panel upward to separate it from the
SSM connectors.
2. Disconnect the cable assemblies.
4.1.10 Wide Band Video Panel Removal (HOP)
First, remove the Module Bracket (see the chapter “Small
Signal Module Removal”).
1. Remove the rear Jack Panel cover (76).
2. Disconnect the ribbon cable connectors.
3. Carefully separate the HOP panel from the SSM
connectors.
4.1.11 Front Control Panel and Left or Right Speaker Removal (5)
1. Remove the Left and Right Side Back Covers.
2. Remove the two screws (on either side) of the speaker
location.
3. Release two tabs on either side of the speaker baffle and
pull the baffle forwards.
4. Loosen the ribbon cable and the grounding wire to allow
working space.
5. Remove two screws to remove the Front Control Panel
(4527).
6. Remove four screws each to remove the speakers (5208/
5206).
4.1.12 Upper Back Cover Removal (4)
1. Remove all screws (A and B).
2. Lift the cover up to dislodge from pegs (J) and remove the
cover.
4.1.13 Plastic Light Barrier Removal (Optical Assembly)
Remove two screws (E) (one each at either end of the plastic
light barrier).
4.1.14 Mirror Mounting Board Removal (57)
Remove all screws, located in the mirror mounting board
brackets, and remove the board.
Note: Take care not to place fingerprints or smudges on the
mirror.
4.1.15 Complete Optical Assembly or Individual CRT Assembly
Removal
1. Remove the Plastic Light Barrier.
2. Disconnect the CRT panels, 2nd anode leads (at HVT),
and the yoke connectors from assemblies to be removed.
3. To remove the complete Optical Assembly, remove four
screws (G) and lift the assembly up and out.
4. To remove individual CRT assemblies, remove four screws
(H) from the desired assembly and lift the assembly up and
out.
Caution: Do not disturb the focus assembly wing nuts, as this
will misadjust mechanical focus.
4.2 Service Position
1. Remove the Side Back Covers.
2. Remove the Front Speaker Baffle.
3. Remove the Front Control Panel.
4. Route the ribbon cable and the wire through opening and
into the back of the unit.
5. Reconnect the ribbon cable to the Front Control Panel.
6. Remove the Side Jack Panel to allow room for cable
movement.
7. Remove the rear Jack Panel cover (76).
8. Being careful with the PIP Panel, pull the Chassis Frame
out and tilt up.
9. Place the Chassis Frame on the bottom board of the PTV.
4.3 Picture Tube Replacement
Replacement of the cathode ray tube (CRT) and/or optical
system components of a Projection TV (PTV) can be easily
accomplished by following general guidelines. Use care when
working around the CRT and optical systems of the PTV. The
PTV light path encompasses a number of precision optical
components. These include lenses, mirrors, the lenticular
screen, and Fresnel lens. The PTV incorporates three separate
CRTs, representing green, red, and blue outputs. Each CRT
uses an independent deflection/convergence yoke, magnetic
centring ring, coupler, C-element lens, and output lens (A/B
lens). Each tube is mechanically fastened to a coupler which
houses fluid (a glycol-type substance) used to cool the high
temperatures generated by the small (7") CRTs. The fluid also
provides an optical characteristic supporting the optical system
of the PTV. When replacement of a CRT or optical component
is required, caution must be exercised in preventing fluid
spillage. The technician must carefully reassemble the CRT/
optical components, ensuring a proper seal of the coupling
fluid. Use only factory original coupling fluid.
Caution: Do not use or add water as an alternative to the
prescribed coupling fluid.
Note: Upon completion of CRT/optical assembly repair, the
centring, convergence, grey scale, mechanical and electrical
focus adjustments are required. If more than one assembly
requires repair, it is recommended the service technician fully
complete one assembly at a time, using the existing
assemblies as a reference for the alignment of the centring and
convergence.
The following procedure should be used when performing
repairs on the CRT/optical assemblies of the Projection TV.
4.3.1 Disassembly Procedure
A. Removal of a single CRT/Lens Assembly from the light
rack
1. Remove AC power from the PTV.
2. Remove the upper and lower back covers (1/4" screws).