It was!
Also, as others have said, the 86 was not remotely standardized, with at least
3 different control boards. Mine had blown PIN diodes and I could not find a
source, so I built in vacuum relays but it took a lot of probing my control
board to find a place to get a control signal for the relays. Not much info on
the internet either.
Appreciate all the help from everyone! Awaiting new fuses.
David
> On Nov 9, 2022, at 9:40 AM, Larry Dighera <LDighera@att.net> wrote:
>
>
> I'll bet the fuse that appeared visually intact was 1A not 1.5A.
>
> Larry
> WB6BBB
>
>
> On Tue, 8 Nov 2022 17:05:47 -0500, David Tenenbaum <dmt013@gmail.com> wrote:
>
>> I think you have nailed it Chris: I had initially visually checked the slow
>> blow fuses and they looked fine, but an ohmmeter confirms one is not
>> conductive. My bad for not checking it with a meter first time around.
>> Embarrassing!
>>
>> Two followups:
>>
>> 1) The schematic says 1.5 amp slow blow, but the chassis stencil says 1.0
>> amp SB. I am guessing it should not matter too much which I go with?
>>
>> 2) Should I be looking at an underlying root cause before trying it with new
>> fuse? I guess worse that can happen is it blows again....
>>
>> Thanks for the help, sorry for the rookie oversight!
>>
>> David
>> N1RO
>>
>>
>>
>>
>>> On Nov 8, 2022, at 4:52 PM, c miller <c_miller_1@hotmail.com> wrote:
>>>
>>> Not too odd really. On 120v it is possible to run the initial startup
>>> cycle on just one of the two windings. Then once the soft start circuit
>>> bypasses then both windings come into operation and unit preforms as
>>> intended. However, with either fuse F3 or F4, or resistor R6 or R7, in the
>>> soft start circuit being open, no power ever gets passed on to the
>>> transformer thus locking the rig in a power off state. The relay k11
>>> (click) is the only part that is able to operate in that failure mode
>>>
>>> Chris
>>> VE3CEA
>>>
>>>
>>> Sent from my iPhone
>>>
>>>> On Nov 8, 2022, at 16:31, gudguyham--- via Amps <amps@contesting.com>
>>>> wrote:
>>>>
>>>> ?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.
>>>>
>>>>
>>>> Sent from the all new AOL app for iOS
>>>>
>>>>
>>>> On Tuesday, November 8, 2022, 3:24 PM, David Tenenbaum <dmt013@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@aol.com 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 <dmt013@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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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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