[ICOM] [IC703] ICOM 703 No TX After Factory Driver Mod

[Bert Morton]

I'm wondering if anyone has experienced the driver failure after doing the 
mod to prevent it ?



From: "Bert Morton" <hamradioguy at vermontel.net>
To: <IC703 at yahoogroups.com>
Sent: Sunday, March 02, 2008 10:25 AM
Subject: Re: [IC703] ICOM 703 No TX



Ironically a mod to address this problem was done at the ICOM factory...


>
> From: "Bob Innes" <innesbob at gmail.com>
> To: <IC703 at yahoogroups.com>
> Sent: Sunday, March 02, 2008 9:49 AM
> Subject: Re: [IC703] ICOM 703 No TX
>
>
>> Hi there,
>>
>> Join the club!!
>>
>> The power output stage MosFet driver has probably popped - this has
>> happened
>> twice to me, $50.00 to fix everytime! This is a very small surface mount
>> device, and unless you have lots of experience at SMD and the correct
>> tools
>> to do the job, *don't *attempt this, take to an Icom dealer!!
>>
>> This is a factory fault, the MosFet sits on 13.8V - this is too high a
>> voltage for this device.
>> The mod, brings this down to 8V, I have found the max power output in 
>> this
>> case now becomes 8 watts.
>>
>> Factory modification puts a jumper from the drain of the device to +8V,
>> and
>> a PC track needs to be cut - the inside of this rig is so tightly packed,
>> the mod needs lots of patience to complete.
>>
>> You may find this mod on *DK-Mods* on the web.
>>
>> Good luck.
>>
>> Regards,
>>
 Bob...................ZS6RZ
 On 02/03/2008, Bert Morton <hamradioguy at vermontel.net> wrote:

My 703 non plus worked fine a week ago. Turned it on this morning and it has
bsolutely no output. Receive is fine. How can this happen so suddenly,or 
maybe I'm missing the obvious.

Did a full reset to no avail.

 Bert W1DFU