Author Topic: Athearn SW1500 Install  (Read 223030 times)

Espeelark

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Re: Athearn SW1500 Install
« Reply #15 on: October 28, 2025, 04:02:50 PM »
Shell install attempt #2.
Okay, the back of the shell now drops all the way down, but, the front won't go all the way down and is doing and bit of a teeter-totter. I determined that the heat-shrinked, solder joints for the speaker wires is the issue. You can see that in this photo of the brown speaker wires running across the top of the speaker.
RPUG - Speaker Wiring Issue.jpg

This one took some head-scratching to figure out.
I decided the wires had to come up a different way, so, the first thing I had to do was pry out the 6-pin wiring harness to allow me to remove the speaker and work on it. Then, I peeled the wires out from the slots in the side of the speaker. I then cut a new groove/slot in the corner. Like this:
RPUG SW1500 - Speaker 03.jpg
Espeelark (Paul Mac)
Modeling the SP in Ohio
"Bad is never good until worse happens...."

Espeelark

  • Engineer
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  • Posts: 80
Re: Athearn SW1500 Install
« Reply #16 on: October 28, 2025, 06:24:25 PM »
All I can say is that there is hardly any space between the inside bottom of the shell and the top of either the SSS speaker or the LM-3S module!
You remember that ~0.2" clearance that I determined I had between the shell and the LM-3S? Some of that gets consumed by the double-sided tape used to mount the module. What's left will only tolerate the wires themselves. The last issue I had getting the shell to sit down flush was determined to be a heat-shrinked, solder joint for the common blue wire - it wouldn't fit between the shell and the LM-3S. Luckily I had enough extra length in the wires such that I could move them back behind the LM-3S, towards the cab, where there was enough of a gap for it to fit into.
When I do the next switcher, I will forego using heat shrink over the soldered connections because there simply isn't enough room for that extra thickness. I will probably trim the soldered leads close together and then coat it with liquid electrical tape.
« Last Edit: Today at 10:44:21 AM by Espeelark »
Espeelark (Paul Mac)
Modeling the SP in Ohio
"Bad is never good until worse happens...."