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

[chacuff]

That's what I remember...never run the other modules with the IF deck 
unplugged or you will smoke something due to loss of regulation.

Cecil
K5DL
----- Original Message ----- 
From: <wc4g at knology.net>
To: <R-390 at mailman.qth.net>; "Roger Ruszkowski" <flowertime01 at wmconnect.com>
Sent: Monday, May 14, 2012 11:43 AM
Subject: Re: [R-390] R-390/URR Completely dead!


> "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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