[Amps] Alpha 86

[gudguyham at aol.com]

It’s odd that it works on 120 and not 240.  I looked in the manual but the terminal strip is not numbered on the schematic.


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On Tuesday, November 8, 2022, 3:24 PM, David Tenenbaum <dmt013 at gmail.com> wrote:

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!!!!
David N1RO/VE3TMK


On Nov 8, 2022, at 2:33 PM, gudguyham at aol.com wrote:
Did you check R8 for open?


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On Tuesday, November 8, 2022, 2:20 PM, David Tenenbaum <dmt013 at gmail.com> 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
N1RO/VE3TMK 
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