American Audio VMS4.1
Printed From: Speakerplans.com
Category: General
Forum Name: General Forum
Forum Description: Open Discussion / Questions
URL: https://forum.speakerplans.com/forum_posts.asp?TID=109135
Printed Date: 27 March 2026 at 5:30am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: American Audio VMS4.1
Posted By: Earplug
Subject: American Audio VMS4.1
Date Posted: 19 June 2025 at 12:56pm
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Alrite -- got a good one here. American Audio VMS4.1 desk/controller with a toasted i.c. (U16).  I
can't find any actual schematics anywhere - & of course, the i.c.
doesn't look like anything else on the board, so can't even take a
guess...  Anyone have schematics, or parts list? Ta.  ------------- Earplugs Are For Wimps! |
Replies:
Posted By: APW
Date Posted: 19 June 2025 at 3:26pm
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It’s obviously a common problem as ADJ sell it as a spare for €11.23 + €16.53shipping, the part is a TPS2111APW and Mouser sell it for about £2.00+P&P https://www.adjparts.eu/inputoutputpcbic-tps2111apw-vms4-1-u16.html" rel="nofollow - https://www.adjparts.eu/inputoutputpcbic-tps2111apw-vms4-1-u16.html ------------- The text above was originally written by a human but was 'perfected' by AI. Any remaining grammatical errors are proof of AI's uncanny ability to misunderstand while exuding absolute confidence. |
Posted By: HumbleDeer
Date Posted: 19 June 2025 at 3:35pm
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Given it's a power mux, I'd advise checking the circuit for shorts or low impedance routes with it removed from the board. They don't "just" blow up because they want to. One of the situations I can imagine causing this, would be attaching the wrong DC power supply with the wrong polarity or a very high overvoltage.
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Posted By: Lucasdude
Date Posted: 19 June 2025 at 3:37pm
| Isn't R11 burnt aswell? I wish you the very best of luck tackling that one without a schematic! |
Posted By: Earplug
Date Posted: 19 June 2025 at 4:17pm
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Ok thanks for all the info, great!  I realise that there might be other problems on the board, but I have to start somewhere! I think that there was a voltage spike, or something similar. The original wall wart PSU is also burned out. I'll have poke around and see what else may be blown before ordering any parts. The owner is keen to get it fixed, tho'. I was hoping for a schematic, of course. It's a difficult one, but done loads of repairs without, so... ------------- Earplugs Are For Wimps! |
Posted By: APW
Date Posted: 19 June 2025 at 4:22pm
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If they are willing to spend $ to get it fixed…. The Wall wart and complete PCB are also available. https://www.adjparts.eu/vms4-1.html" rel="nofollow - https://www.adjparts.eu/vms4-1.html ------------- The text above was originally written by a human but was 'perfected' by AI. Any remaining grammatical errors are proof of AI's uncanny ability to misunderstand while exuding absolute confidence. |
Posted By: Earplug
Date Posted: 19 June 2025 at 6:48pm
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Ok -- but OUCH on those prices... Just seen one second hand going for 120€. I found a few other faults, so might just recommend that he buys that & keeps this one for spare parts. ------------- Earplugs Are For Wimps! |