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I had an issue with the wall wart for my both my ISY99i and ISY994i.
The ISY994i started to get touchy. And when I tried a power cycle restart.
It never restarted. The LEDs on it just pulsed.
My thoughts the slightly higher starting current was too weak.

Wall warts can cause all kinds of X-10 signal problems but this time was different.  A few weeks ago I noticed that I was having a lot of very brief internet outages (see below). There's a lot of construction going on around here so I chalked it up to that but after a week of it getting progressively worse I started troubleshooting. 
Turns out that the cable modem's wall wart was the issue.  While it measured 12 volts it apparently was no longer delivering the 2 amps the modem needed.  The same thing happened last year and a new wall wart solved it.  This time though, I used a 3 amp wall wart to provide a little extra headroom so I'm hoping it'll last longer.
The outage graph (from SamKnows) below shows what was going on.

As you all know, I have had X10 working for me since 1984 in some way or another. Right now everything is working nearly prefectly with Homegenie, Raspberry Pi and much help from this website. Only problem I have is how one wall in my garage is cluttered with one setup for homegenie. the dreaded automatic nightime light system.

Currently I have an appliance module setup to turn on and off at sundown and sunup. this is in homegenie as A4 and is setup fron sunrise time from openweather website. Works wonderfully. It should. Took over  month to get it working.

Next step is an RR501 transceiver on A1 plugged into the timed appliance module triggered by an MS16 motion sensor when you open the door. This turns on the lights in the garage ond the light over the step. The macro has a wait time of 5 minutes to let you get into the house before the lights go out.

So far this has all been working as well as most X10 installs (99.99% prefectly with just enough errors to keep you guessing)
but I feel there should be a simpler way. Maybe a way to replace the timed modulein with a timed restriction in the macro. I don't understand the way to use "if-then-else-endif" in HomeGenie.But a nudge in the right direction could get me pointed in the right direction.

With many thanks for both past and future assistance,

Dave

Could  be because of the possible chip issues.
The load on the power supplies is lower and the voltage is slightly higher.

Thanks will try that tonight if I have any.  Appreciate the input still curious about the Vcc votages will need to get some caps.  1k at 35v and 470at 16 need to check spacing.

Thnaks very much.

Al

A couple of things to check are the MAX serial chips to restore communications and, if you can do that, try loading the f/w again.

I have 2 stargates working and a third for a spare.

Currently one of them has a problem.  turning it on left led flasshes and then goes out.  other 3 keep flashing.  I cannot connect to winevm no comm, but ports and cables work on other units.  I measured Vcc and it reads 5.5.  12v read 12.8 on this unit.  working units have 4.9v and 12.3v.  This unit is 22 years old without failures.


Caps look ok but?

Any thoughts would be appreciated.

Thanks,
Al

Thank you for the update.

Totally correct. I looked at the wrong order and copied the wrong line. My apologies.

Can you verify the filter part number?
The PLC01 is an X10 repeater.
Are you maybe thinking of an XPPF plug in filter?
Yes those power supplies are one of those we see causing problems.