no, there is no service menu.
everything is set in the single chip that makes up most of the radio.
the only access you have to settings is through the menus or through the 
programming software, which is the same menus and not very accessible.
So, there is nothing you can do as a user or even as a technician to change 
what's happening beyond the basic menu settings.
Everything is set in firmware except one basic frequency offset adjustment 
pot inside the radio.
This radio is a single chip that does everything, and all functions are 
controlled by firmware...beyond that there is a power amplifier and a basic 
user interface system and that's it.
Your RX frequency could be slightly off kilter and that's why when you get 
flutter it drops stuff out...but again, no way to set that as the internal 
pot is for tx frequency adjustment only.
Maybe this is a bug with your unit as I haven't heard of anyone else having 
this specific issue.  Mine works great on a squelch setting of 3 on both vhf 
and UHF both mobile and stationary.
73
Colin, V A6BKX
----- Original Message ----- 
From: "Michael Thurman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 09, 2013 1:52 PM
Subject: Baofeng uv5r service manu?


>I there a service menu for the uv5r? If you know who to get into it even =
> if it is not the slightest bit blind friendly that is ok. I  need to =
> adjust the squelch hysteresis if possible. on uhf it works great even =
> mobile, but on vhf  any mobile flutter weather on my end or the other =
> station's end of the contact drops out my squelch and then it takes =
> forever to reopen it.  I can copy a signal perfectly if I  open the =
> squelch but even with it set to it's most sensitive, which I presume is =
> 1, it is usable on most of the vhf repeaters even with a good antenna =
> not he car, or  simplex even with my station's antenna. any other radio =
> is perfect under the same conditions and antennas, so it is definitely =
> the radio.  when it is stationary it is very sensitive.   and works =
> great for public service events through a repeater as long as I am =
> stationary