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4.
Figure 4-17 Small signal board 3/3
4.1.12 Left or Right Speaker Removal
1. Remove the Left or Right Side Back Cover.
2. Remove the two connectors [1] from the speaker.
3. Remove the two fixation screws [2] of the speaker.
Figure 4-18 Speaker
4.1.13 Plastic Light Barrier Removal (from the Optical Assembly)
Remove two screws [1] (one each at either end of the plastic
light barrier).
Figure 4-19 Light barrier
4.1.14 Mirror Removal
1. Remove the upper back cover.
2. Remove two screws [1] at the top of the mirror.
3. Remove two screws [2] at the bottom of the mirror.
4. Remove the mirror.
EBJ1.0U
Mechanical Instructions
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Note: Take care not to place fingerprints or smudges on the
mirror.
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4.1.15 Complete Optical Assembly or Individual CRT Assembly
Removal
1. Remove the upper back cover.
1. Remove the Plastic Light Barrier.
2. Disconnect the CRT panels, 2nd anode leads (at the 6-
pack HVG), and the yoke connectors from assemblies to
be removed.
3. To remove the complete Optical Assembly, remove four
screws [1] and lift the assembly up and out.
4. To remove individual CRT assemblies, remove four screws
[2] from the desired assembly and lift the assembly up and
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out.
Caution: Do not disturb the focus assembly wing nuts, as this
will misadjust mechanical focus.
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4.2
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
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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
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2
Figure 4-20 Mirror
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Figure 4-21 Optical assy
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