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Old 15th July 2011, 01:30 PM   #1
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Default Luxman Line Phase Sensor

I own a Luxman D-06 CD player. It has a line phase sensor which does not work. In the manual, it does not mention the sensor at all and I am thinking perhaps, Luxman decided to disable it. The power cable is a 2 prong as well with no ground. Although, some D-06 seems to have a 3 conductor power cable. Maybe the earlier models.

Does anyone know how the sensor is supposed to work? I've tried plugging the power in both ways and I assume the sensor is supposed to light up if the hot and neutral is reversed.

Great sounding CD player, by the way.
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Old 15th July 2011, 02:17 PM   #2
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phase sensor is supposed to operate like a "testing" screwdriver .... I presume you have those in your country as well

to operate the phase sensor you need to touch the metal plate that is arround it and if the sensor glows then you are in the correct connection of your ac PLUG ( only part that looks metal since the rest is all black )

the idea is that if you have all you eq conected with the same flow of AC the conditions is better for power supplys to operate ..
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Old 15th July 2011, 02:47 PM   #3
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Originally Posted by sakis View Post
phase sensor is supposed to operate like a "testing" screwdriver .... I presume you have those in your country as well

to operate the phase sensor you need to touch the metal plate that is arround it and if the sensor glows then you are in the correct connection of your ac PLUG ( only part that looks metal since the rest is all black )

the idea is that if you have all you eq conected with the same flow of AC the conditions is better for power supplys to operate ..
I do touch the gold metal of the sensor. The led light does not glow at all. I've tried reversing the plugs as it is only a 2 coductor plug. Nothing makes the light glow.

The info I've read is that it glows if the hot and neutral is reversed at the outlet. However, this only makes sense if the plug is a 3 conductor where you can only plug it in one way. Anyway, with AC, why does the hot/neutral really even matter from a operational standpoint. Maybe for safety concerns, yes, but sound? I listened to the unit plugged in both ways and can't tell any difference in sonics.
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Old 16th July 2011, 08:39 PM   #4
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I found the reason why the phase sensor is not working. Someone have disabled it. A resistor has been removed (R501). Not sure why anyone would do this.

I am now trying to find the schematic for the D-06 but have difficulties. Can anyone assist or point me in the right direction to get a service manual for the D-06? I need to find out what the value of the resistor is so I can fix this problem...
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Old 17th July 2011, 10:48 AM   #5
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the resistor is 2.2 M ( mega ohm ) 1/2W

( by the way the light is not comming from a led ... its coming from an inductive neon glow lamp no actuall filament inside )
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Old 17th July 2011, 12:30 PM   #6
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Originally Posted by sakis View Post
the resistor is 2.2 M ( mega ohm ) 1/2W

( by the way the light is not comming from a led ... its coming from an inductive neon glow lamp no actuall filament inside )
Thanks for this info. I am just curious to why anyone would disable this. The dealer swears that they never opened the unit up. Would Luxman disable this feature for the U.S. models? Very strange.
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Old 17th July 2011, 02:58 PM   #7
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More likely the part never got put in and that was never tested to see if it worked before shipping. It is a useful test.
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Old 17th July 2011, 07:37 PM   #8
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More likely the part never got put in and that was never tested to see if it worked before shipping. It is a useful test.
I don't think so because the legs of the resistor is still there soldered in the pcb through hole. The resistor body was snipped out... Unless there is some sonic benefits of disabling this phase sensor circuit, I can't imagine why anyone would do this.

I suppose some also believe that by turning off the info screen of the deck, the music sounds better too. The D-06 has that feature where you can turn off the info screen lights.

I could not tell any sonic benefits by having the phase sensor circuit abled or disabled.. let alone, I heard no difference whichever way the plug was plugged in..
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Old 17th July 2011, 07:43 PM   #9
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Originally Posted by sakis View Post
the resistor is 2.2 M ( mega ohm ) 1/2W

( by the way the light is not comming from a led ... its coming from an inductive neon glow lamp no actuall filament inside )

It occured to me, is this resistor value for the European model? That would be 220volts. The sensor circuit is connected directly to the neutral leg of the power input. So, here in the U.S. it is 120v AC. Considering current is volts / resistance, I wonder if the 2.2M ohm would be a correct value for the U.S. model?

With 220volts and a 2.2m resistor, it would be 1 microamp of current that is fed to the neon lamp. So perhaps, with the U.S. model, I need a 1.2M ohm resistor?
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Old 18th July 2011, 01:10 PM   #10
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Originally Posted by GeneJazz View Post
It occured to me, is this resistor value for the European model? That would be 220volts. The sensor circuit is connected directly to the neutral leg of the power input. So, here in the U.S. it is 120v AC. Considering current is volts / resistance, I wonder if the 2.2M ohm would be a correct value for the U.S. model?

With 220volts and a 2.2m resistor, it would be 1 microamp of current that is fed to the neon lamp. So perhaps, with the U.S. model, I need a 1.2M ohm resistor?
The resistor is just there for safety any value above 100K will work. The neon lamp will drop 60 volts or so. The remaining 60 at 100K would limit to .6ma, so even if you wet your finger and stood in a puddle you would at worst feel it but not be injured.

The idea is that the power transformer has the start of the primary windings closer to the core, so there is more coupling and noise if the start is connected to the hot lead.
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