[amsat-bb] Re: FT-847 Disaster

[Ollie Eisman]

Thanks to the PolySat team at CalPoly, nice scans of the FT-847 manual 
and schematics are here:

http://polysat.calpoly.edu/earthstation/documents/index.php

Joe wrote:
> Don't feel bad,,
> I had a Kenwood TS-700.
> every lightning storm I'd unplug it from everything.
> 
> It had a built in 110VAC supply.  But the 4 connector plug was also the 
> same plug you used for the 12VDC input,,  just different pins.
> 
> I must have a thousand times pulled this connector before a storm, and 
> re attach it afterwards when I wanted to use the rig,
> 
> somehow one day  110VAC  went into the 12VDC pins, needless to say the 
> rig did NOT like this even with the rig being off.
> 
> LOTS of smoke and missing parts on boards after this happened.
> 
> But it was a great rig,
> 
> It with NO preamp,  but 4  eight elemet  yagis i was able with a 40 
> watt  amp I actually worked 22 stations off the moon.  and that was LONG 
> before any of this new fangled software recieving stuff,  it was 
> strictly with headphones and by ear.  way cool,,  wouldn't mind having 
> another one.
> 
> Joe WB9SBD
> 
> Jim Jerzycke wrote:
> 
>> IIRC, the 847 has a "protection" diode across the DC
>> input. Connecting the DC backwards will blow the fuse,
>> and probably short the diode.
>> You can download the service manual from the mods.dk
>> website.
>> 73, Jim  KQ6EA
>>
>> --- k7zt at suddenlink.net wrote:
>>
>>  
>>
>>> Hi All:
>>> I'm afraid that I reversed the DC Polarity to my
>>> FT-847.  Needless to say, "the smoked leaked out",
>>> therefore, the 847 has ceased to operate.  
>>>
>>> I understand that the 847 has protection for
>>> careless hams like myself.. I was hopping that
>>> someone on the board has had this experience (no
>>> need to reveal). Or if someone could let me know
>>> what may need to be replaced to get my radio back in
>>> working order.
>>>
>>> Many Thanks,
>>> - Joe Westbrook, K7ZT
>>> _______________________________________________
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>>>    
>>>
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>>
>>
>>  
>>
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