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SZ class of 310 high speed emus were built by Fiat in 2000. They run as 3-car units, operating on 3000 volt DC, and are rated at 2000 kW, 2680 hp with a top speed of 200 km/h, 125 mph. There are 30 first class and 134 second class seats.
SZ 310 002 was the leading unit of train EC 51 (15:44 to Ljubljana) at Venezia S. Lucia on Tuesday October 17th, 2006.
This is one of the variants of the 133 internal structure.
Let's call this an early edition until I learn the proper name for it.
See how the case is a bit taller and narrow.
The issue I started to fix was a PTT hang up in the unit.
Seems there are two ways this happens.
A straight mechanical issue with the PTT switch.
Got this tip from N6CY
"The only think I did with my HM133 was to “flow” some rubbing alcohol into the PTT switch enclosure a couple of times while cycling the switch.
The mic still works, but maybe that was just a temporary fix."
This is very similar to the issue with this microphone.
It was hanging up in PTT.
Plus the caps were failed.
In this case the PTT switch had a mechanical failure in it.
Had to run solvent into the switch, then lubercate it with high quailiy mineral oil to keep it running.
The second is when the electrolytic caps (the silver parts) fail.
When that happens the electronics in the mic 'hang up' in PTT.
There are also hints of level shifting in the TX audio.
Anyhow, clean up the switch, solder in new caps, and the mics work properly.