Fan And Bottom Panel Removal; Support Bracket And Shield Removal - Zenith ZCM-1490 Service Manual

Fan and Bottom Panel
Removal
A cooling fan is attached to the inside of the bottom
panel of the monitor chassis. A portion of the high
voHage assembly is also secured to this panel in
some chassis. To remove the fan and bottom panel:
1. Carefully set the monitor face down on a soft
surface. Be certain that there are no objects that
can scratch the surface of the display glass. The
glass is treated with a special non-glare CCLI
coating that can be damaged by abrasives.
2. Loosen the bottom panel. Refer to Figure 3-7
and remove the four hex screws that secure the
bottom panel to each of the side panels.
3. Remove the screw that holds part of the high
voltage assembly to the bottom panel. In some
units, the high voltage assembly is located en-
tirely on the deflection board, so this step may
be unnecessary; Pull the panel out to expose
the fan.
4. Refer to Figure 3-7 and remove the three hex
screws that secure the fan and air guide to the
bottom panel. Remove the fan and disconnect
the fan wires from the power supply board
(connector 3S8).
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BOTTOM PANEL
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Figure 3-7. Fan and Bottom Panel Removal
Disassembly
Support Bracket and
Shield Removal
In addition to the bottom panel, a metal support
bracket and wire mesh shield are connected to each
of the side panels across the bottom of the chassis.
To remove the support bracket and shield:
1. Remove the fan and bottom panel as described
earlier.
2. Refer to Figure 3-8 and remove the six hex
screws that hold the wire mesh shield in place.
Lift the shield away from the support bracket
and replace the screws.
3. Refer to Figure 3-8 and remove the two hex
screws that secure the support bracket to the
side p'anels. Remove the bracket and replace
the screws. After this bracket is removed, the
side panels (with the deflection, power supply,
and dynamic focus boards attached) will lose
most of their support.
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SUPPORT
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Support Bracket and Shield Removal
Page 3-5