[R-1051] R-1051 capacitors

[paul swed]

Very good comments and experiences
Would like to hear about the HV approach. Not that I have an issue
Capacitors are my very best friends. I have obtained, repaired, and made
operational more test equipment and stuff then you can shake a stick at
because of bad caps. When I get equipment thats not working (Cheap)I tend to
follow these steps.
Before powering
Visual observation including the sniff test.
Look for obvious hacks
Switch and mechanical checks fans...
Always ohm out fuses and power supply outputs Looking for the obvious short
Power up
Generally a few meters on critical supply voltages. May have to guess if no
diagrams
If things come up without smoke logically figure out the rest.
Though this is when it gets tough cause the easy shorted caps are most
likely not an issue.
Luv Tantalums. They make really great fire crackers.



On Tue, Feb 2, 2010 at 9:51 PM, Geoff Fors <geoff at wb6nvh.com> wrote:

> The tubular electrolytic capacitors in the R-1051's are all getting rather
> old.  It's a good idea to run through all those axial lead jobs on the
> boards under the chassis with an ESR meter and replace the dried up ones.
>
> I have decided the R-1051 is one receiver where it only makes sense to have
> two of them in good working order.  That way when one breaks down you can
> swap modules to pinpoint the issue.  Otherwise it's rather frustrating,
> since it wasn't designed to be troubleshot to the component level in the
> field.  Not many of us have the module test fixtures or the full set of
> extender cables.
>
> I don't know whether the earlier messages from years ago are still
> searchable via the system, but some problems which were common include the
> inserts falling out of the connectors on the chassis, motorized switches
> inside the modules which failed to function or synch up correctly, and
> mainly, almost endless issues with the six-pack module.  The tubes in the
> turret module have always been utterly flat in the receivers I have gone
> through.  You mileage may vary.
>
> The power transformers can have a high voltage short to the case which may
> or may not blow fuses.  If this happens to you, post a message back here
> and
> I will explain how to repair 99% of these even though it's a sealed
> transformer.
>
> The RF (antenna) overload/protect board has caused some "no reception"
> issues for me in the past.
>
> The general rule seems to be to start troubleshooting at the frequency
> standard and work your way out from there.  First timers should make sure
> the reference oscillator switch is set to "INT" as many of these receivers
> were used on board ships and at stations where they were slaved to a master
> oscillator/standard.
>
> Trivia - the interlock is defeated by pulling up and slightly sideways on
> the white plastic "shoe" piece attached to the switch.
>
> Geoff
> WB6NVH
>
>
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