yamaha FX500 60hz hum

[movinginslomo]

Found a yamaha FX500 for cheap, but has a significant 60hz hum and may need new filter caps in the power section. Can anyone help me identify which are the filter caps? I am not a schematic wizard.

https://www.synthxl.com/wp-content/uploads/2020/01/Yamaha-FX500-Guitar-Effects-Processor-Schematic.pdf

[jimilee]

C 147-150 c147 is. 220, you might try raising that or outing another one over the DC jack.


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[movinginslomo]

C 147-150 c147 is. 220, you might try raising that or outing another one over the DC jack.


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c147 is 2200 and the 25 is 25 v correct? You are a big help dude

[jimilee]

C 147-150 c147 is. 220, you might try raising that or outing another one over the DC jack.


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c147 is 2200 and the 25 is 25 v correct? You are a big help dude

Yep. Happy to help.


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[movinginslomo]

Nice. I'm learn-ding. If my dad didn't bring back covid from a european vacation i'd hit him up he's rehabbed some vintage computers (couple of c-64's and an Amiga).

Pro-tip stay away from european package vacations right now. especially France (no offence to any Francs here, my solidarity is with you)

[movinginslomo]

The large electrolytic should be discharged as good practice? Also glued to the PCB... acetone?

[jwin615]

If it's been off for an hour, not needed. Can tap a screwdriver across it if it makes you feel better.
It's not HV like in tube gear. Would be sure to always discharge before putting a meter on it though. Especially an lcr meter.

[jwin615]

Oh, and as for glue, if it's hot glue, I usually snip what I can loose, then use a heat gun on low to soften and tug with needle nose.
Sometimes you can pop it all off in one go.
Being Yamaha, I'm guessing it's that hard yellow stuff.
I only remember the struggle and not the solution  I think I used some variation of brute force to get enough off the make it work.dremel attachments and safety squints and such.

[movinginslomo]

The stunning conclusion.. (not so stunning). So I did end up replacing the caps in the power filter section, and a new CMOS battery as there was some corrosion. Still 60 cycle hum. Then as I was studying the power supply.. it is NOT the stock power supply as it's only 10 volts. My crappy eyesight was reading the 120v as 12v. It is a yamaha power supply, but the "fx500" sharpied in gold on it is not right. I had assumed someone had done that as to not get power supplies mixed up. Ordered an aftermarket 12v supply and no noise. Well no unwanted noise. Well no deliberately unwanted noise, the distortion patches leave something to be desired. Works great now.

Now, what everyone wants to know, I have owned both a catilinbread fx40 AND I still own a keeley realizer (replaced the fx40) and the original patch is much better. Live I would use the keeley pedal as it's good enough, but on tracks, definitely the unit. Next, knowing me I will likely end up trying to find an spx90, but those things have stupid prices.

[jwin615]

Glad you got it sorted!
I just got an fx40 in yesterday but haven't had a chance to give it time yet. Note that the L/R delay is excluded on it. Have to patch a delay in front. I don't know if it was due to limited dsp on the fv1 or not but they pitched it as it being left to the user for flexibility.
I too have a realizer which I got for the reverse reverb but it feels a little too short to me. I like the SF patch so figured I'd give the fx40 a shot.
I attached the fx500 settings for patch 40. Note the slight offset between Land R channels.
I also just got a Logidy EPSi. It's out of production now but it's, to my knowledge, the only impulse response reverb pedal made. I'm hoping I can nail the reverse reverbs with it(along with other cool reverbs)

If I dig the fx40 and the EPSi works out, I'll probably offload the realizer.

[movinginslomo]

Glad you got it sorted!
I just got an fx40 in yesterday but haven't had a chance to give it time yet. Note that the L/R delay is excluded on it. Have to patch a delay in front. I don't know if it was due to limited dsp on the fv1 or not but they pitched it as it being left to the user for flexibility.
I too have a realizer which I got for the reverse reverb but it feels a little too short to me. I like the SF patch so figured I'd give the fx40 a shot.
I attached the fx500 settings for patch 40. Note the slight offset between Land R channels.
I also just got a Logidy EPSi. It's out of production now but it's, to my knowledge, the only impulse response reverb pedal made. I'm hoping I can nail the reverse reverbs with it(along with other cool reverbs)

If I dig the fx40 and the EPSi works out, I'll probably offload the realizer.

Yea I also have an alesis Midiverb II for reverse delay. The realizer does a good enough facsimile, but if I'm recording it's the Midiberb. Patch 49 "bloom" on the Midiverb too... *chefs kiss*

It's funny all the rockier grungier guys in the alt-rock world were shunning the rack gear in favor of pedals and Marshalls. The shoegazers however.. why there was never crossover, I dunno