He is having multiple problems:  Amp won't auto band switch, and the 
tuner won't open the relay to break the keying line during a tune.

73, Steve KW3A

On 1/19/2016 11:34 AM, Butch Bussen wrote:
> I had one of those that had problems with Kenwood radios.  They tried
> firmware upgrades and even sent me a chip, finally had to change or
> remove a rresister, would have to find my notes on that.  Had to do with
> a wrong logic level.  Once the resister was changed, worked fine.  I
> haven't been paying a lot of attention, wht problem is he having.  I
> still have mine but don't use it.  Been kicking around selling it, but I
> never seem to get rid of ham stuff, just accumulate...
> 73
> Butch
> WA0VJR
> Node 3148
> Wallace, ks.
>
>
> On Sun, 17 Jan
> 2016, Steve Forst wrote:
>
>> Richard,
>>
>> Another thought on your issue.   There have been firmware updates to the
>> tuner over the years.  Since it is a used tuner, perhaps it needs a
>> firmware update?    I think the firmware version shows up on the power
>> up message on the tuner's display..   The latest version is on the MFJ
>> site.   I've never done it, but firmware is  installed via the 9 pin
>> serial connection on the rear of the tuner.
>>
>> What brought this to mind is a faint memory  of some Kenwood users
>> having some sort of problem with this tuner years ago.    I really don't
>> remember what the problem was, but some were resolved with firmware, and
>> some had to go in to the shop for  some chip replacement.
>>
>> Just another thought.
>>
>> 73, Steve KW3A
>>
>>
>