[Yaesu] FT-757GX difficulties

[Jack/NA7RF]

Ron Youvan wrote:
>> I've encountered a few problems with my recently purchased '757, some of
>> which I can repair but a couple have me stumped:
> 
>> 1) No carrier null on USB but the receiver seems to be working okay. LSB
>> is perfectly okay. I have looked at on-line resources and see no mention
>> of this issue.
> 
>   I don't understand, transmit or receive?  If receive is the pass band
> tuning centered, does adjusting it cure the problem?

Sorry, I thought stating carrier null would infer transmit...receive 
works fine on all modes.
> 
>> 2) Inconsistent tuning rate. At some places in the knob rotation I get
>> normal (10Hz?) steps but at other spots the step rate is at least 100Hz.
>> That made tuning tough in the NAQP RTTY contest! Is there a possible fix
>> for this or can the encoder assembly be replaced?
> 
>   You need to ascertain if it is related to the position of the knob where
> the action changes, or it is truly random. The digital encoders can 
> frequently
> be cleaned or repaired.  Lint, cracks or paint flaking on glass or plastic
> disks have been found to cause troubles,  They are pretty durable overall.
> I do not know how to disassemble this kind/style.

The position of rotation where the erratic tuning occurs does not 
change. I've never had this radio apart so I have no idea as to how the 
encoder is configured. Based on other comments it looks like I'll have 
the rig apart to attempt cleaning of the encoder wheel.

Thanks to all who replied...

Jack, NA7RF