Hello,
i am trying to fix the strobe light on a RP-1000MK2 turntable. I cannot find a proper service manual, so i'm asking for some help.
The strobe light is very dim, flickers and turns of when starting the platter. Looks like a bad connection, but its not. The "light bulb" itself looks very black and burned out.
It is connected directly to 230V mains with a 12k 1/2W resistor after the power switch and before the transformer. Which replacement "light bulb" (red or orange) can i use here.
I only found service manuals for the newer Reloop models, but they are not useful because these models all use Led's for the strobe light.
Many thanks!
EXTC
i am trying to fix the strobe light on a RP-1000MK2 turntable. I cannot find a proper service manual, so i'm asking for some help.
The strobe light is very dim, flickers and turns of when starting the platter. Looks like a bad connection, but its not. The "light bulb" itself looks very black and burned out.
It is connected directly to 230V mains with a 12k 1/2W resistor after the power switch and before the transformer. Which replacement "light bulb" (red or orange) can i use here.
I only found service manuals for the newer Reloop models, but they are not useful because these models all use Led's for the strobe light.
Many thanks!
EXTC
The connection to the mains via a resistor suggests it is a miniature neon bulb (see attachment).
These lamps are readily available from the likes of online auction sites.
P.S. Reloop say they have a "friendly technical support team" that can be contacted via email or their social media channels.
These lamps are readily available from the likes of online auction sites.
P.S. Reloop say they have a "friendly technical support team" that can be contacted via email or their social media channels.
Attachments
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Hello, i found the service manual of another hanpin model (Omnitronic BD1520) and this is mostly the same device.
It is a neon bulb connected to the transformer center tap (115V). I didn´t look closely enough, so at first i thought it is connected to 230V.
I found some NE2H neon lamps, but they all say to use a resistor abour 33k (115V) or about 100k (230V). So i´m wondering about the existing 12k resisitor?
Probably i just also change the 12k to 33k ?
kind regards!
EXTC
It is a neon bulb connected to the transformer center tap (115V). I didn´t look closely enough, so at first i thought it is connected to 230V.
I found some NE2H neon lamps, but they all say to use a resistor abour 33k (115V) or about 100k (230V). So i´m wondering about the existing 12k resisitor?
Probably i just also change the 12k to 33k ?
kind regards!
EXTC
If the current is too large, the electrodes in the neon bulb 'sputter' particles which darken the lamp - as appears to have happened in your case.
So? The warranty is long expired.
You can still get neons today (we were yakking at another forum). But they sure are going out of style. An LED, with a bridge rectifier, and enough resistance to set 10mA, may be our next trick for future maintainability.
That is correct, PRR.
In some cases it's a better solution.
I'd use a single diode as rectification though, to provide half-wave illumination to an LED, giving it a bit more contrast in reading the TT rim strobe markings.
That would result in a 60Hz "blink" as opposed to a 120Hz blink-rate.
And the power can be sourced from the secondary of a power transformer (if used).
Through the decades, I've replaced many of those neon bulbs, darked from use, flickering, etc.
They usually run them "hot" by using a 10K series resistor for more "brightmess".
Just replace them, maybe up the resistor some, they might last another 10 years.
They usually run them "hot" by using a 10K series resistor for more "brightmess".
Just replace them, maybe up the resistor some, they might last another 10 years.
Good point, wiseold, both brightness and life expectancy depend on the magnitude of the series resistance and some compromise may be necessary.
The life expectancy of a NE-2H neon lamp at 120 volts AC is ~20,000 hours with a 33K resistor and ~5,000 hours with a 22K resistor.
The life expectancy of a NE-2H neon lamp at 120 volts AC is ~20,000 hours with a 33K resistor and ~5,000 hours with a 22K resistor.