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Old 1st December 2013, 10:30 AM   #1
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Default Pass X1 problem

I've just moved house and relocated my audio equipment. The X1 has been working fine for 3 years or so at the old place. I set it up in the new room and plugged in; there is no audio. I've tried all the inputs; a balanced output from the CD player into input 1, and a jack converter from laptop/tablet into input 4 etc. Nothing works. I've checked all the settings, tape, mute etc. The balanced out goes into a pair of X600, I don't have any other balanced equipment I can test the amps with but I'm pretty sure they're okay (when you plug in the cable to the amps with them on, the speakers react).

I took the lids off the X1, the insides look immaculate. It was carefully transported.

The thing I've noticed is when you change inputs it used to give a quiet clicking noise inside the preamp, which it doesn't do now. The mains power in the new place is 3 phase with a ground rod earth, I'm not sure if this would have any effect? Any suggestions would be very much appreciated.
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Old 1st December 2013, 11:43 AM   #2
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The quiet clicking noise would have been the input select relays. If they have stopped working it looks as though you are missing the relay supply.
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Old 1st December 2013, 01:52 PM   #3
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Whqt do you mean with 3 phase power? Like the onde used in industry?
If yes it would have much higher voltage than regular house ac and could have damaged something inside.
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Old 1st December 2013, 01:54 PM   #4
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AFAIK 3 phase is quite common in the US. I'll let one of our American friends comment on that one.
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Old 1st December 2013, 03:01 PM   #5
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(checked the fuse ?)
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Old 1st December 2013, 03:06 PM   #6
jmsent is offline jmsent  United States
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Did you just try to do a hardware reset (unplug it from the mains, wait a few seconds, and plug it back in?). I had an X1 years ago, and it would occasionally "glitch" with these exact same symptoms.
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Old 1st December 2013, 03:31 PM   #7
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If you ask Nelson very nicely he might send you the schematics for the PSU. I've got them for the X2 but I think that is very different.
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Last edited by KatieandDad; 1st December 2013 at 03:33 PM.
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Old 1st December 2013, 04:11 PM   #8
wayne is offline wayne  United States
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Do you have display? If no clicking from the relays it could be supply or low line voltage. If the line is too low a P fet turns off relay power.
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Old 1st December 2013, 04:56 PM   #9
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Many thanks for the responses. I'm sure it is the relays (at least) The supply to the house is 440V which is stepped down at the head to 3 230V single phases. They recommend it for any house that might require more than a single 100A supply. I've tried resetting, checking the cables, different sockets etc.

Wayne, yes the display operates as usual. The jumpers in the PSU are set to 240V, should it be 220V? (this is UK). It's never been a problem before but this is a different supply.

Best

Guy
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Old 1st December 2013, 06:30 PM   #10
FoMoCo is offline FoMoCo  United States
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3 phase is not common for residential in the US. We have a single phase split. There's a single phase transformer winding that has the center tap connected to neutral and earth. This gives 120-0-120 Vrms. Since the two "120's" are out of phase, loads connected between them see 240Vrms.

It's highly unlikely this is the problem.
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