| Author | Topic: Echoplex EP3 repair |
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Patrick Lyons
From:
Tennessee, USA | Posted 9 Mar 2018 11:00 am | Hey I recently got an EP3 that wasn't working and I took it to a shop in Chicago that said that they repair these. The repair guy said that there is no schematic for this one, there is no ser #, and there are three boards instead of 2, so now he doesn't know how to fix it, because the previous owner had someone rewire it, and wants to charge me $140 for his time.
Does anyone anyone have s a schematic for this, or know how to fix them? Any help would be appreciated, thanks
One last thing, the repair guy asked that I put this text up here and I will add it to the original post as well
'You bought an EP-3 that was hacked and rewired by someone and the unit doesn't work. I took it into a service center and they informed me that this version EP-3 has no schematic online. Does anyone have a schematic?'
Thank you
Last edited by Patrick Lyons on 12 Mar 2018 10:52 am; edited 3 times in total |
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Charlie Hansen
From:
Halifax, NS Canada and Various Southern Towns. | Posted 9 Mar 2018 12:47 pm | Is this of any use to you?
https://www.manualslib.com/manual/1011631/Maestro-Echoplex-Ep-3.html
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Bill Sinclair
From:
Hagerstown, Maryland, USA | Posted 9 Mar 2018 2:50 pm | $140 to admit that he doesn't know how to fix something? Sheesh. That aside, he may just be confused about the boards. Page 26 of the document Charlie linked to shows the board with the T2 transformer (that black square thing - bias oscillator?) on the side of the panel with the power transformer and motor. On yours it's on the other side of the panel, with the other two boards. Pages 27, 28, and 29 are the schematics for three different serial number sequences of the EP-3. He should be able to figure out which one matches your unit.
If it's a guitar amp repair shop, there's a good chance that they haven't had much (or any) experience biasing a tape head. It's been 40+ years since I've done it so I'm afraid I wouldn't be any better. |
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Michael Butler
From:
California, USA | Posted 9 Mar 2018 7:56 pm | patrick: there is an echoplex group on facebook. you may want to join to gain for further information. i have two ep3s but neither look like that. yours may be the ep4.
play music!
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http://muscmp.wordpress.com/ |
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Godfrey Arthur
From:
3rd Rock | Posted 9 Mar 2018 7:58 pm | Here's a vid clip showing some repair tips:
https://www.youtube.com/watch?v=SSgmkG6XXqc
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Michael Brebes
From:
Northridge CA | Posted 10 Mar 2018 8:41 am | What is wrong with your Echoplex? It's a relatively simple circuit and easy to repair. The biggest repair problem I have had with these is replacing mechanical parts that are bad or heads that go bad. I can fix it for you, if you want to send it to Los Angeles, and it won't cost you $140 for me to tell you I can't fix it. That's the sign of someone that doesn't know electronics very well, what we used to call 'tube jockeys' in the 60's who thought they could just swap out tubes until they found the problem in an old TV.
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Instrument/amp/ pickup repair
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Aaron Jennings
From:
Montana, USA | Posted 10 Mar 2018 4:10 pm | If that is an EP-3 it is one of the models with a compression board in it. These were only in some of the EP-3s and many people bypass or remove them...
Others do not! |
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ajm
From:
Los Angeles | Posted 11 Mar 2018 11:04 am | It sounds like you have two problems.
1) You have an EP that doesn't work.
2) You have someone that wants to charge you $140 for doing nothing.
It sounds like Michael Brebes can fix the first one for you.
The second one? Well............ |
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Jim Sliff
From:
Lawndale California, USA | Posted 11 Mar 2018 1:02 pm | 1. Find a new tech.
2. See #1
ANY competent amplifier tech can repair the electronics on ANY device like that - schematic or not. Some may not be able to deal with mechanical issues, but the electronics are solid-state electronics, not digital 'chip' devices where certain functions may not be obvious.
And no reputable tech charges for 'no work performed'. They accepted the unit in good faith, claiming competence - and didn't perform.
You owe them exactly $0. No bench charge. No 'flat rate'. They didn't do anything.
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Stephen Cowell
From:
Round Rock, Texas, USA | Posted 11 Mar 2018 9:37 pm | My EP-3 had a bad input FET... I believe the exact part is obsolete. I used a plain-jane RatShak JFET and re-biased it by changing the source(?) resistor... easy to do. That looks like a real clean unit, keep it and cherish it! I did a whole bunch of crazy things to mine, it's a great platform for modding.
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New FB Page: https://www.facebook.com/AustinSteelGuitarClub/?fref=ts |
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Patrick Lyons
From:
Tennessee, USA | Posted 12 Mar 2018 10:08 am | One last thing, the repair guy asked that I put this text up here and I will add it to the original post.
'You bought an EP-3 that was hacked and rewired by someone and the unit doesn't work. I took it into a service center and they informed me that this version EP-3 has no schematic online. Does anyone have a schematic?'
Thank you |
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