[R-390] R-390/URR Completely dead!

[wc4g at knology.net]

"Once you get the filter replaced. Un plug all the wire harness connectors."

Note:  When you unplug the IF deck connector you will lose filament voltage to V607 and then lose B+ regulation.
 - - Ask me how I know - -

73
Don WC4G
Charleston, SC
 On Mon 05/14/12 11:30 AM , Roger Ruszkowski flowertime01 at wmconnect.com sent:
> 
> Jim,
> 
> We know the original line filters have internal caps that conduct enough,
> current to ground, to trip modern GFI devices. This current is also the
> source of many shocking experiences. Options are,
> Replace it with another filter from a hanger queen (ask here on the
> reflector) or NOS.Gut the one you have and wire it straight through
> Re stuff the one you have with some smaller caps and bigger inductors.
> Find a nice filter device from a switching power supply that accepts the
> new style computer cords and install it with a butch plate.Re stuff the original case with the guts from one of these new style
> filters.
> I think you have more problems than just the filter. It could be that a cap
> shorted and then opened a inductor in the filter. But I think you have a
> short further down the line. I am not surprised the fuse did not blow and
> you could expect a problem after the fuse.
> Pull out the power supply and audio deck and check the 27 ohm resistors and
> the 6082 series regulator tubes.Check the oil filled power supply caps in the main frame chassis. These two
> critters are located different than in the R390/A. The R390 depends on the
> series regulator tubes to filter the B+ ripple not so muchthe filter caps.
> If the caps are not shorted with a meter, or just plain rusted to the point
> of leaking, they are likely good.
> Once you get the filter replaced. Un plug all the wire harness connectors.
> Get out your power cord with the in line fuse and make sure you have a
> small 2 amp fuse in the test fuse holder. You do not want to burn up a wire
> harness looking for a short.  Drag out the schematics to determine what
> order from power cord to speaker the connectors should be re connected
> in.Do not unplug and re plug connectors with the power on. Be systematic in
> your procedures.
> Not a big problem.
> 
> Roger AI4NI
> 
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