Adcom GFA-545

adventfan · 3rd February 2011, 01:32 PM

The Adcom that i just got from e-bay came without the on- off light in it.Did they makes some like that? It has the hole for it but no light i opened it up and seen no light in it .Anyway how hard would it be to put one in any help would be great.

eidling · 4th February 2011, 03:30 AM

I don't know the value of the bulb, some of the more technical people can answer that, but I just happened to have my 545 open when I read your post, so here are photos of what you will see inside (if you get a really tiny hex wrench to remove the screws on the top panel).

I hope the photos will help you.

adcom gfa-545 power light wiring | Flickr - Photo Sharing!

close up and personal | Flickr - Photo Sharing!

singa · 4th February 2011, 06:59 AM

Hi, It's not a light bulb but a LED (light emitting diode).This should be easy to
do,just get a red led of suitable size, 3mm or 5mm (large) in diameter and two lengths of wire can be same colour ( just know which is which). The positive red to the longest lead of the led and the negative black to the shorter one.If you are using a canabalised led from a junk pcb ,the horizontal tab/structure in the led is the negative tab/lead.

I don't see any current limiting/brightness resistor.Maybe it's in the power
supply pcb. Singa

adventfan · 4th February 2011, 03:08 PM

Yes the pic was a great help thank you,,By the way how do you like your amp?Just got this a few weeks ago and i really enjoy it.

3rd February 2011, 01:32 PM	#1
adventfan diyAudio Member Join Date: Aug 2007	Adcom GFA-545 The Adcom that i just got from e-bay came without the on- off light in it.Did they makes some like that? It has the hole for it but no light i opened it up and seen no light in it .Anyway how hard would it be to put one in any help would be great.

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4th February 2011, 03:30 AM	#2
eidling diyAudio Member Join Date: Oct 2006	I don't know the value of the bulb, some of the more technical people can answer that, but I just happened to have my 545 open when I read your post, so here are photos of what you will see inside (if you get a really tiny hex wrench to remove the screws on the top panel). I hope the photos will help you. adcom gfa-545 power light wiring \| Flickr - Photo Sharing! close up and personal \| Flickr - Photo Sharing!

4th February 2011, 06:59 AM	#3
singa diyAudio Member Join Date: Apr 2004 Location: near	Hi, It's not a light bulb but a LED (light emitting diode).This should be easy to do,just get a red led of suitable size, 3mm or 5mm (large) in diameter and two lengths of wire can be same colour ( just know which is which). The positive red to the longest lead of the led and the negative black to the shorter one.If you are using a canabalised led from a junk pcb ,the horizontal tab/structure in the led is the negative tab/lead. I don't see any current limiting/brightness resistor.Maybe it's in the power supply pcb. Singa

4th February 2011, 03:08 PM	#4
adventfan diyAudio Member Join Date: Aug 2007	Yes the pic was a great help thank you,,By the way how do you like your amp?Just got this a few weeks ago and i really enjoy it.

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