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Marquee Power Supply Removal |
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We recommend annual removal of the low voltage power supply
for the purpose of cleaning dust from inside of it, using a
shop vac or canned compressed air; this allows for proper heat
dissipation and extends the life of the LVPS. Also, those wishing
to obtain E-Tech's proprietary Fan Noise Reduction Mod will want to
pull out the LVPS for shipment. |
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To remove the LVPS, the lower front grill must be removed, it is held in
place with four phillips screws (see PIC 1). The grill can be pulled away
to reveal (see PIC 2) the LVPS on the left, (it is the larger of the two
metal boxes and features the power cord socket on its' front), and the high
voltage power supply on the right. The LVPS is secured to the frame with two
more phillips screws (see PIC 3). With screws removed, the LVPS can be pulled
forward out of its' bulkhead Amphenol connector (see PIC 5), there are no loose
wires to contend with. We also advise cleaning dust out of the compartment and
the connector itself using compressed air or a small brush. The LVPS can be
flapped open upon removal of three small screws that hold it together; take
care to open it slowly as there are wire harnesses connecting the top and
bottom circuit boards inside. To reinstall the LVPS merely seat it into its'
bulkhead connector, there are guide pins in place to help that, and reinstall
the screws and front grill. The high voltage power supply is similarly removed
and requires disconnection of the red anode feed cable from the high voltage
splitter block which is found on top of the green tube inside the main cover.
Do seat the anode connectors firmly until they click into place, a pair of
large needlenose pliers are advised for that task. |
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Note: Those wishing to obtain our Fan Noise Mod need to e.mail me for details at
ehometech@earthlink.net
or call 480 368 7434 and ask for Tim. The mod includes test and repair of the dreaded Filament
Overvoltage problem which can quickly destroy a set of CRTs; see our Gray Scale Tech Tip for more
info. |
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