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Post subject: EVH 5150 iii Reverb
Posted: Mon Apr 29, 2019 12:13 pm
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Hello all. I recently bought a EVH 5150 iii combo 1x12 in a million pieces that another tech gave up on. I have fixed the amp and it's rocking, except the Reverb. I have been unable to locate a schematic showing the Reverb DSP circuit. Does anyone know where I might get one? Really trying to avoid having to take the boards out again and trace it. Thanks !!


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Post subject: Re: EVH 5150 iii Reverb
Posted: Tue May 07, 2019 1:48 am
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look here; Is it what you are looking for ?

https://www.amprepairparts.com/schematics.htm

Fender
5150iii


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Post subject: Re: EVH 5150 iii Reverb
Posted: Wed May 08, 2019 10:09 am
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Hello and thanks for the response. Those are the schematics I have, which I used to fix the amp. The 5150 iii 1x12 also has a Power Attenuator pot and a Reverb pot (digital reverb). They are both located on the right (facing the amp). Internally they are on a breakaway Screen Bias board. That is the schematic I cannot find. The rest of the amp is the same, head or combo.


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Post subject: Re: EVH 5150 iii Reverb
Posted: Wed May 08, 2019 11:38 am
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I did not find schematic yet

Here the owner manual for the combo 2 X12 with attenuator.

http://support.evhgear.com/manuals/7712840000_A.PDF


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Post subject: Re: EVH 5150 iii Reverb
Posted: Wed May 08, 2019 11:46 am
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Write to Fender Consumer relation, they will send you schematic if available.
They do for me


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Post subject: Re: EVH 5150 iii Reverb
Posted: Sun May 12, 2019 9:27 am
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http://www.synthmanuals.com/manuals/evh/evh_5150iii_2x12_combo_amp/schematics/evh_2x12.pdf

Last page, doesn't show the reverb module, just a note showing where it plugs in.


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Post subject: Re: EVH 5150 iii Reverb
Posted: Mon May 13, 2019 11:02 am
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Vinyl, how did you find that under synth manuals? You have more patience than I.
While the module isn't shown, take a close look at Q304 on the scrn breakaway board. It is the Reverb mute transistor. These JFETs are common failure items. The digital systems are usually reliable. If I had to place a bet, it'd be 5:1 for the Jfet.


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Post subject: Re: EVH 5150 iii Reverb
Posted: Mon May 13, 2019 11:08 am
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synthmanuals.com - that was a long shot. Nice detective work.


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Post subject: Re: EVH 5150 iii Reverb
Posted: Tue May 14, 2019 9:38 am
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TimsAudio wrote:
Vinyl, how did you find that under synth manuals? You have more patience than I.
While the module isn't shown, take a close look at Q304 on the scrn breakaway board. It is the Reverb mute transistor. These JFETs are common failure items. The digital systems are usually reliable. If I had to place a bet, it'd be 5:1 for the Jfet.


Internet search, but I use DuckDuckGo, rarely use Google. I think I typed in "EVH 5150iii combo schematic".

DuckDuckGo is a search engine that doesn't track your searches. I'm a bit of a privacy freak.


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Post subject: Re: EVH 5150 iii Reverb
Posted: Tue May 14, 2019 10:13 am
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vinyl wrote:
Internet search, but I use DuckDuckGo, rarely use Google. I think I typed in "EVH 5150iii combo schematic".

I just tried the same search terms in Google search and that article is at the top of the list of results.


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