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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  DOD FX80B Compressor Sustainer sounds like a tremolo? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: DOD FX80B Compressor Sustainer sounds like a tremolo?  (Read 3551 times)
JohnForeman
Posts: 113


Re: DOD FX80B Compressor Sustainer sounds like a tremolo?
« Reply #20 on: April 26, 2012, 05:47:55 PM »

Cjones, you have the same tremolo effect problem?
If so,  can you check your pcb and compare it to the pics of mine and see if they are the same.  Especially the rev level and see f you have the break in the trace like I have in mine.
Thanks
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JohnForeman
Posts: 113


Re: DOD FX80B Compressor Sustainer sounds like a tremolo?
« Reply #21 on: April 27, 2012, 08:57:55 AM »

Hey Sisko, did you fall off the planet?
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SISKO
Posts: 387


Re: DOD FX80B Compressor Sustainer sounds like a tremolo?
« Reply #22 on: April 28, 2012, 08:41:13 AM »

Im here!

So Q1 is working properly then.
Mine doestn have that brake. I assume its a RC voltage filter (100ohm + the big cap). Its fine if you bypass it with a glob of solder on the broken trace to see if that was the problem.

So all of your transistors measures seems to be ok. The problem could still be on semiconductors (you can check voltages for all the Ics) but honestly I think its somewhere else. I tough it was Q1 but youre meassurements showed me Im wrong.

You can look for cold solder and/or playing while you move transistors and caps with your fingers. Also have you disscard wire problems (bad cables, loosy jacks) and all external problem (make sure it was the only pedal on the chain, not an amp tremolo, etc etc)?
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--Is there any body out there??--
cjonesplay
Posts: 4


Re: DOD FX80B Compressor Sustainer sounds like a tremolo?
« Reply #23 on: April 30, 2012, 04:21:43 PM »

Cjones, you have the same tremolo effect problem?
If so,  can you check your pcb and compare it to the pics of mine and see if they are the same.  Especially the rev level and see f you have the break in the trace like I have in mine.
Thanks


Just saw this. Sure, I'll do this when I get home this evening.
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cjonesplay
Posts: 4


Re: DOD FX80B Compressor Sustainer sounds like a tremolo?
« Reply #24 on: May 01, 2012, 11:35:07 AM »

Ok, here you go. Looks like I'm in possession of a revision A board. Went poking around on it plugged in last night and couldn't find any broken solder joints. Moved/touched the IC's with my hand and nothing spectacular. Checked for continuity in all the solder points and didn't find anything strange. Looks to be all original (my dad bought it new back in the 80's) and I can't find any evidence of abuse anywhere.

http://chrisjones.info/otherstuff/boardcomp.jpg
http://chrisjones.info/otherstuff/boardsolder.jpg
« Last Edit: May 01, 2012, 11:41:29 AM by cjonesplay » Logged
cjonesplay
Posts: 4


Re: DOD FX80B Compressor Sustainer sounds like a tremolo?
« Reply #25 on: May 01, 2012, 11:36:57 AM »

Sorry, screwed up the links:

http://chrisjones.info/otherstuff/boardcomp.jpg
http://chrisjones.info/otherstuff/boardsolder.jpg
« Last Edit: May 01, 2012, 11:40:35 AM by cjonesplay » Logged
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