[ICOM] Icom 7800 Problem ?

[Don\]

Your post was a little difficult to follow Phil but if it helps, I have a 
7800 of the 600 series serial numbers and it has performed flawlessly thus 
far - through an MB5A tuner as well if that matters.
Have had a 781 since they first came out and actually prefer that over the 
7800. I think if I had your problems, I would not hesitate to get rid of it 
and all the frustrations.
73. Don
----- Original Message ----- 
From: <KG4LRU at aol.com>
To: <icom at mailman.qth.net>
Sent: Wednesday, May 02, 2007 6:54 PM
Subject: [ICOM] Icom 7800 Problem ?


>
> Too the list
> I been an owner of 7800 since January this year , In fact 3 one used and 
> two
> new ones. A group of us all bought 7800 at the same time a few serial
> numbers apart.
>
> The first radio was used upgraded Roofing Filter radio was just returned
> from Icom with the upgrade purchased from Burghardts in SD from Jim The 
> screen
> would disappear I was able to reinstall the display cable that was not 
> fully
> seated and all was well . I really enjoyed the radio everything worked 
> Just
> Fine  except the screen problem. I liked so much that Bought a new one and
> shipped the  radio who in turn resold the radio T a Buddy of mine in BC 
> Harry  Ve7JH
> in  BC . HE received it and all was well for two weeks Then one day screen
> Flashed  bright white  and radio tripped the rear circuit breaker after
> resetting  the radio did power back up and worked but no power output. The 
> radio was
> returned Burghardts for repair and tradded for a new 7800. ( Harry and I 
> have
> run 781 since the radio was first built) Harry had decided that owning a 
> new
> one  since he owned the 781 so long that he would prefered to own a new 
> unit
> as I did  . Burghardts shipped him a new one . Used one had lost its 
> finals .
>
> In the mean time My new 7800 had Two weeks of run Time on it and it Died
> same fate as Harry Used one . Now Harry had  new one  and my new one  was 
> in
> transit back too Burghardts .
>
> WE also had a buddy in KC MO KB0VSL who runs a new 7800 Bought from
> different dealer But had serial number very close to ours  his 590, mine 
> 604 Harry's
> 616.  WE all used the same antenna s and use out board antenna  Tuners . 
> With
> talking with Jim at Burghardts and Dan Miles at Icom it was  suggest that
> because we had out board Tuner this caused the problem ,  Understand  that 
> both
> Harry Ve7jh has over 50 years  Naval Radio  Officer and I was first Lic in
> 1969. And never had a problem with our 781 or any  other radios in the 
> Shack .
>
> Dan Miles ran  a short Test at Icom on a 7800 It was thought the  radio 
> was
> going into oscillations  causing the finals to go away or  the on board 
> Tuner
> was be left on causing the problem. Need less to say the 7800  passed not
> showing any problems whats so ever.
>
> Burghardts replaced the Both of our radios with new ones . I have had My 
> new
> 7800 now just shy of two weeks with very little run Time since I travel
> weekdays for work. Harry on the other hand  has been operating his 
> everyday  . I
> just received  email from him That his new 7800 ,ser 645 failed .   Bottom 
> Line
> he was in the shack got a call from the XYL to run too the store .  He 
> left
> the radio on his return the radio was off But the red light was not lit. 
> he
> reset the main switch on the back panel . The radio did come on and 
> received
> But No power  output  .
>
>
> Now my radio is still working  . But it got me thinking what could  cause
> this failure without transmitting .
> Now I have heard of other 7800 having failures of the same sort. But was
> never been able to confirm if they had been the same type of failure .
>
> I am guessing here  Voltage spikes from the power Lines ? Cant  really
> believe that we could have three failures on the 7800.  I live in KY  were 
> our
> power company has power  spikes I can here them on my apcs not  sure how 
> big of
> spike . Also my 781 and Harrys 781 have never had a failure  , Only 
> difference I
> can see is the 7800 has switching supply and the 781 has  Linear supply .
>
> Has anyone out 7800 land experience this type failure .   I   was thinking
> maybe losing neutral ground could be the problem.  I did a  quick check 
> but I am
> not seeing an unbalanced line.
>
> I know that 200 watt radios have had more final problems than the 100 
> watts
> ones regardless of Brand ,this was confirmed By Jim  at Burghardts  .
>
> I am thinking Heavy Duty surge protection . Please If you have had  this 
> type
> failure Let me Know.
>
>
>
> Phil Zavagli AI4DQ
>
>
>
>
>
>
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