[Top] [All Lists]

Re: [Amps] Alpha 86

To: "" <>
Subject: Re: [Amps] Alpha 86
From: David Tenenbaum <>
Date: Tue, 8 Nov 2022 15:24:20 -0500
List-post: <>
Thanks for the feedback!

I am still on the clock at work but took a break to check R8 and I am seeing 
3.98K ohms, so the 4k resistor seems intact. Later tonight when finally done 
with work I will tear into it to look at the fuses and other resistors, confirm 
there is REALLY 220 v getting to the unit, and anything else that comes up.

Thanks all for the ideas!!!!


> On Nov 8, 2022, at 2:33 PM, wrote:
> Did you check R8 for open?
> Sent from the all new AOL app for iOS 
> <>
> On Tuesday, November 8, 2022, 2:20 PM, David Tenenbaum <> 
> wrote:
> Hi All,
> I have an Alpha 86 that I have been using set up for 110v, and finally have 
> access to 220v, so looking forward to seeing what it can REALLY put out. 
> Unfortunately I have made the jumper changes (terminal in the back for 110 
> operation has locations 1&2 jumpered, 3&4 jumpered, and 5&6 jumpered, but for 
> 220 only locations 2&3 are jumpered), and the unit fails to light up or come 
> online. I hear a single relay activation when I hit the "On" switch, but no 
> lights or fan.
> Fearing I hurt the unit I restored it to 110v operation and all is good. I 
> set it back to 220v and same problem. I checked continuity from the plug's 
> ground to chassis ground, and the hot leads show continuity to the right 
> places. I have been using a 220v SB200 on that outlet just fine.
> Any thoughts or leads appreciated! Never thought I would have a problem just 
> switching supply voltages.....Scan of schematic attached....
> Best,
> David
> _______________________________________________
> Amps mailing list
> <>
> <>

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>