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f13ndus · November 7th, 2009, 11:07 AM

Hey all - I've got a Holy Grail pedal I need to fix for a friend - it still functions, but it had a mishap with a power supply and let out the magic smoke

Seems the first resistor on the circuit board got burnt out. It's what the power to the board comes into, so I assume it fused together, because the pedal still functions fine, but I noticed it and would like to replace it for reliability's sake.

Anyone got a Holy Grail they can open up, and check the value of R1 for me? It's the large SMD resistor on the top left of the board, marked R1, right next to where the red wire from the power jack attaches. It's on the top side with all the other components. This is on a Rev. A board, BTW.

Any help appreciated!

f13ndus · November 8th, 2009, 01:54 PM

Here's a picture of the board/burnt resistor, if it helps. R1, in the upper left of the board. As you can see, it's burnt too far for me to read the value off of it!

RomanS · November 8th, 2009, 05:41 PM

The bands are red-black-gold-gold, and it measures at 2.2 ohms in my HG.

f13ndus · November 8th, 2009, 06:37 PM

Hmm, so by the bands it's a 2 ohm resistor. The burnt one measures at 4.8ohm, I figured if it was fused it'd be closer to zero...

Can't find a 2ohm in my "new" parts stock, time to go scour "parts" circuit boards! Thanks for the help!

November 7th, 2009, 11:07 AM	#1 (permalink)
f13ndus TDPRI Member Join Date: Oct 2008 Location: Louisville, KY Age: 25 Posts: 68	EHX Holy Grail repair, anyone help with a resistor value? Hey all - I've got a Holy Grail pedal I need to fix for a friend - it still functions, but it had a mishap with a power supply and let out the magic smoke Seems the first resistor on the circuit board got burnt out. It's what the power to the board comes into, so I assume it fused together, because the pedal still functions fine, but I noticed it and would like to replace it for reliability's sake. Anyone got a Holy Grail they can open up, and check the value of R1 for me? It's the large SMD resistor on the top left of the board, marked R1, right next to where the red wire from the power jack attaches. It's on the top side with all the other components. This is on a Rev. A board, BTW. Any help appreciated!

November 8th, 2009, 05:41 PM	#3 (permalink)
RomanS Friend of Leo's Join Date: Jun 2006 Location: Vienna, Austria Age: 37 Posts: 4,119 22 Photos	The bands are red-black-gold-gold, and it measures at 2.2 ohms in my HG. __________________ http://www.myspace.com/romans212 http://www.myspace.com/theneatpickers http://www.thomassoulriverband.com/

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November 8th, 2009, 06:37 PM	#4 (permalink)
f13ndus TDPRI Member Join Date: Oct 2008 Location: Louisville, KY Age: 25 Posts: 68	Hmm, so by the bands it's a 2 ohm resistor. The burnt one measures at 4.8ohm, I figured if it was fused it'd be closer to zero... Can't find a 2ohm in my "new" parts stock, time to go scour "parts" circuit boards! Thanks for the help!

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