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By no power do you mean you get no response from CD or radio out of the speakers when trying to use the radio? Should this be the case then I'd like you to check a few places.
First look to make sure the wires in the back are not broke or the insulation has somehow been negated.
Next is to check the power wires and ground wire. Look for an inline fuse anywhere between the battery and either power wires. One should always be installed to prevent a surge reaching the head unit so make sure to check for a fuse. Replace if blown with same size fuse, never bigger.
Remove the face plate and notice the reset hole (last hole on the left) Take a pen or other pointed but not sharp item and stick it into that hole and hold for 10 seconded. Then retry.
Make sure the contacts for the face plate where it hooks into the head unit are clean and don't have any grime buildup that would prevent any of the contacts from contacting.
Next you can try removing all power wires and wait for 5 minutes and re-connect. Sometimes this will also reset the unit.
Your unit was discontinued and not made for long and this may be a part of why the manual is difficult to find... for free anyway it is. I can say I don't need a manual to help you determine why the unit is not powering on.
How are you determining has power but just not responding to the on/off button? A volt meter check to the wires perhaps at the back of the radio? If you get power to the wires at the back of the radio then double check your ground real well because if the ground is good then, at that point, the head unit is bad.
If you perform all the tests I stated above and still no dice then the head unit is bad. There is no "code" for the radio so that will not be a factor. It's really a process of elimination.
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This question has been around for quite awhile, but if anyone else requires the information, as best as I can tell from the owners manual (see below) on page 12, each time the radio is turned on, it starts on channel 16. I believe this to be an important feature in case the user is involved in an emergency situation.
(As a victim or as a possible rescuer.)
Unfortunately, Uniden won't part with their schematics cheaply.
As a matter of fact, for about the same money you can buy a new VHF with DSC capability. Welcome to the world of disposable electronics. In case you or anyone else require the owners manual for the MC 795, I've included it at the link below.
Hope this was of same help.
I realize this question has been here forever, but I've included the link to the Owner's Manual in case anyone requires it. Page 5 shows which wires go to/from external equipment. Orange (+) and the small black (-) are for your external speaker. Green is + for gps data in while the brown is GPS ground. Yellow is not used.
You might start by contacting Uniden's customer service. The phone number for Parts and Service is 1-800-554-3988. The phone number for Customer Service is 1-800-586-0409, I had an Oceanus, and I was impressed with Uniden's friendliness & support.
Error message: "Could Not Initialize the Renderer"
What that essentially means is: your video card does not properly support the features required by Marine Sharpshooter II. Specifically, your card does not support Hardware Transform and Lighting functions, often referred to as HardwareT&L. Essentially, it's a type of processor, or "renderer," of the complex math equations that the video card handles instead of the main CPU.
The Fix: You need at least a nVidia Geforce 2 or ATI Radeon 7200 video card for Marine Sharpshooter II.