Marantz 1030 led light help please

[TerryD]

My led light is out and I don't want to burn this succer up.  I looked at the manual and can't figure out the ratings for the led light.  I know I need them because I had a couple of leds on hand and blew them up..immediately.   Thank you Terry

[sluckey]

What LED??? I'm looking at a service manual for Marantz 1030 and there is no LED.

Give us more info. What's the purpose of the LED? Where is it physically located? What size? color? shape?

Post a hi rez pic of the LED as mounted on the unit.

[TerryD]

Thank you for your patience.  Then, what I am referring to is the on-off "light" (or whatever it is then) that is just above the on-off switch that actually informs you that the unit is on or off.  It is no longer working.  It's hard to get to so I clipped the wires and will use those wires to give me somehkind of on-off light outside the unit. Here is a picture if it gets attached.  Its the light that isn't working just above the power switch...you'll notice I already have an on/off switch on the power cord to the 1030 as the switch broke a long time ago and getting in there looks to be over my head...but it sure feels nice.  On closer inspection I see the light was blue.  Any light would do, even on the cord, provided that it wasn't bright so as to be distracting.

[sluckey]

The power indicator light is a small incandescent lamp (not a LED) connected to a dedicated secondary winding on the power transformer. The "blue" color is simply a plastic lens attached to the front panel. Just measure the secondary voltage and get a lamp rated for that voltage (or slightly higher) that will physically fit. Radio Shack may even have one that will work.

[TerryD]

Done.  Measured at 7.6 volts.  Got a 12 volt minilight at radio shaack..seems to work fine.  I even got it in the same position.  Seems a little dim.  they had bigger 12 volt lights and I will probably get one of those as the hole for the light is quite a bit bigger than the little dot of a light I got.  Thank you, thank you.

[sluckey]

They also have a 6 volt miniature lamp with wire leads that would be brighter. I'll bet the original lamp was rated at 6 volts.

[TerryD]

OK..good.  The 6 amp was perfect. In fact it was the same size as the old one.  When I first looked at the schematic (before I got on here) I thought it was what you said, but I couldn't believe they would devote a whole secondary of a transformer just for the on/off light...I wouldn't have known what to do with it anyways.  Thanks again.

[PRR]

The amp is older than economical LEDs.

High-voltage low-power incandescent lamps are costly and unreliable. A dedicated winding costs little (in mass production) and was not too uncommon.

Next time it fails...

LEDs always need a resistor (or other current limiting).

If you just feed them >2V, they suck infinite current for a very short time.

If you had put a few hundred ohms in series with the LED, you'da been happy(*).

Anyway any time you don't know what you are doing, adding some resistance makes the smoke come out slower and maybe in a cheaper place.

(*)Pretty much happy. If you move your head quick, an AC-power LED flickers and makes strobe-trails. Maybe a non-issue in a livingroom. On a stage amp I chose to add a full-wave rectifier in the LED feed. No filter-cap to fail: less-strobe was better than no-strobe and a new part to fail and plague me in my old age.

[Willabe]

High-voltage low-power incandescent lamps are costly and unreliable.

So the point is the filament is more at risk at a high voltage with less current than with a low voltage with a higher current?


                   Brad         

[P Batty]

Another Marantz 1030 still in service!  I've used mine (bought used) for over thirty-five years now and it still works as new, almost all the other SS hi-fi amps and receivers I've had over the years are long gone.

[PRR]

Hi-volt low-watt lamp is a VERY skinny filament.

Wants to break when making the lamp; higher cost. Likes to break in service, which means extra care in making to avoid excess complaints; higher cost.

Not so much when you buy one or two. But when you buy a million, you like the lower-volt choices.

[Willabe]

Hi-volt low-watt lamp is a VERY skinny filament.

Ok, thanks.


             Brad     

[Slimtim]

"Anyway any time you don't know what you are doing, adding some resistance makes the smoke come out slower and maybe in a cheaper place." PRR
LMAO!!!

[smackoj]

I'm not sure if I 'know what I am doing' but I will try to contain any smoke coming from 'cheap places' to the jakes, aka outhouse. I mean, just to be safe.

 

[TerryD]

I bought two 1030's from the library when they got rid of them for about 10 bucks a piece, twenty some odd years ago.  One 1030 runs my front speakers and one my back.  The light probably lasted 40 - 50 years...so hopefully there will be no "next time" for me.

Thanks for all the info & help.