Author Topic: Help with a dead vintage MXR Flanger  (Read 1429 times)

ugly_guitar_guy

Help with a dead vintage MXR Flanger
« on: December 28, 2010, 07:51:32 PM »
A co-worker gave me his old 70's MXR Flanger unit to try to fix and I honestly don;t know where to start. It passes signal just fine, but when switched on it makes a very loud buzzing and has zero guitar signal. A quick look at all components shows nothing out of place or joints/traces broken so I can only imagine what could be the cause. Any help or an idea of where to begin?? Thanks!
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Scruffie

Re: Help with a dead vintage MXR Flanger
« Reply #1 on: December 28, 2010, 07:56:12 PM »
Could be any number of things, i'd start with swapping out the CMOS Chips, they seem to go alot, bad caps could also be a culprit and Op-Amps can go too.
Hopefully it's not the worse case scenario, Dead BBD  :'(

Cardboard Tube Samurai

Re: Help with a dead vintage MXR Flanger
« Reply #2 on: December 29, 2010, 01:14:40 AM »
I just did a google search to find which pedal it was (because I'm awaiting chips for an Ibanez Flanger) and came up with this http://www.diystompboxes.com/smfforum/index.php?topic=82254.0. Read the edit in the last post. Did this come up in a forum search at all?
« Last Edit: December 29, 2010, 01:17:24 AM by Cardboard Tube Samurai »

oldschoolanalog

Re: Help with a dead vintage MXR Flanger
« Reply #3 on: December 29, 2010, 08:43:39 AM »
First try replacing the big power supply cap.
Most likely component to fail.
At 30+ years of age, that should be done anyway.
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R.G.

Re: Help with a dead vintage MXR Flanger
« Reply #4 on: December 29, 2010, 09:22:59 AM »
First of all, go to http://www.geofex.com and read http://geofex.com/fxdebug/fxdebug.htm picking especially the link http://geofex.com/fxdebug/geriatric.htm.

Once you've done that, ask questions.
R.G.

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