This is a common problem in old Alphas.
F3 is a protection fuse in case the step-start
relay fails to close in its allotted time.
Check K2 and R2 for failure/burning
GL!
Phil, K5PC
Subject: [AMPS] SICK ALPHA 77DX
>
> Hello to all,
>
> I have an Alpha 77dx that had been working fine until yesterday.
>
> Now when I turn on the amp there is no high voltage. (There is about 230
> volts per the Alpha meter). The blower runs but the amp will not switch
> into the "standby mode". I checked the fuses and the 2 amp "F3" fuse had
> blown. I replaced this fuse with another 2 amp "slow blow" fuse. Powering up
> the amp again resulted in another blown fuse after about 3 seconds.
>
> Any advice would be appreciated.
>
> Thanks
>
> Noll W9RN
>
>
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>
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