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Old 12-07-2010, 11:24 AM   #31
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Hey Guys sorry I have been tied up - traveled back to MA to be with our kids during Thanksgiving. I definitely need to get me a MH to travel these miles - especially since we will become grandparents in March! I believe the Mrs. and the dog will be much happier!

I see a Concertone demo vehicle in my future, hopefully in time for the FROG get together! :-)

Sooo, I REALLY do not think anyone after replacing two or three units is going to find that changing it again is going to solve your problem. We recently tested several units with these complaints and found all measurements to be within specification and the units test fine on the Bench (with no visible issues).

I realize this is a conundrum, but we are trying to determine what is going on. This is why I asked what RV model this was happening with and even with that, I think we need to step back again and ask everyone who is experiencing this same problem to post up what YEAR/MAKE/MODEL RV you have. So even if you told me the model already please repost with the above.

Thanks
We have a 2009 Forest River Rockwood Wind Jammer 3001WS. We have the fourth unit in it which lasted under two months.
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Old 12-07-2010, 12:49 PM   #32
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I did one other thing in our V-Lite. We had an issue that when the AC compressor came on the TV would turn off for just a split second and come back on. I tightened all the screws on the wires going to the cct breakers in the converter panel and that problem went away. I also replaced the ZX700 right around that time and it does not have the jumpy picture now so maybe it was tightning the connections in the converter panel and not the new ZX that cured ours. It may be something for others to try as it is an easy job and free.
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Old 12-07-2010, 04:21 PM   #33
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Sorry I misplaced this thread! :-)

This is truly bizarre. We have tested several of the units and found them all to be within specs and working fine on our bench. We will continue to investigate...
Bob,
Have they ever tested them in a trailer? Just a thought. Maybe it is related to the electronics in the trailer itself.
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Old 12-07-2010, 10:25 PM   #34
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Sorry I misplaced this thread! :-)

This is truly bizarre. We have tested several of the units and found them all to be within specs and working fine on our bench. We will continue to investigate...
Well, that's simple to determine in concept but difficult in actuallity.

What's different between the test bench and in the trailers?

Off the top of my head:

Power supply - Test bench power supplies tend to be regulated and steady to within a tight spec whereas VS shore power convered to 12v or 12 v battery tend s to spike, dip and be electrically "noisy".

Cabling - routing (IE: power line bundled with signal line in trailer but seperated on the bench, etc), connector quality, cable quality and cable guage differences between test bench and trailers, etc.

Filtering - is there a "choke" on any of the test bench lines, Etc....



Were the ones put on the test bench "returns" with the jumping screen problem or ones pulled out of stock supply?

Lots of variables to look at.....
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Old 12-08-2010, 08:20 AM   #35
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Well, that's simple to determine in concept but difficult in actuallity.

What's different between the test bench and in the trailers?

Off the top of my head:

Power supply - Test bench power supplies tend to be regulated and steady to within a tight spec whereas VS shore power convered to 12v or 12 v battery tend s to spike, dip and be electrically "noisy".

Cabling - routing (IE: power line bundled with signal line in trailer but seperated on the bench, etc), connector quality, cable quality and cable guage differences between test bench and trailers, etc.

Filtering - is there a "choke" on any of the test bench lines, Etc....



Were the ones put on the test bench "returns" with the jumping screen problem or ones pulled out of stock supply?

Lots of variables to look at.....
Great white may be on to something here.
The video signal shifting up and down could coincide with a power pulse coming off a power wire that is too close to the video cable. It should be an easy check to see how the converter puts out power or the battery charger?
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Old 12-08-2010, 09:43 AM   #36
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Great white may be on to something here.
The video signal shifting up and down could coincide with a power pulse coming off a power wire that is too close to the video cable. It should be an easy check to see how the converter puts out power or the battery charger?

I have just a "wee bit" of experience with this sort of stuff.....

For doing a proper check of the power output of the converter you would need and osciliscope. But checking voltage pulses and amperage is a simple multimeter though. Most likely a problem would exist in the rectifier bridge when converting from AC to DC pulse. This wouldn't explain the behaviour on battery though...

I get the feeling most trailers have "less expensive" power units. These lower end pieces can tend to be "noisy" due to thier construction. If the zx700 is "picky" about the quality of the power, it can "hiccup" when the power does something out of the zx700's spec (ie: sees a frequency outside of it's tolerance, voltage drop, etc).

I have had issues before with signal wires running parrallel with power supplies. The EMF induced in the signal wire by the power can lead to all kinds of wierd things from noise and signal degredation to god-knows-what.

Cheap wires with minimal shielding are also subject to this problem.

Looking inthe cabinet of my rls26 revealed that all the wires were zip tied together. I doubt my rlbss831 is any different. My 26 didn't "jump" but it had a zx75, perhaps a bit more tolerant of power or signalling issues than the zx700?

Just some stuff to consider.....
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Old 12-08-2010, 10:13 AM   #37
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Yes we understand the difference between the test bench environment and those in the TT! And yes, we have actually help discover issues with other equipment or installation based on issues such as this. And yes, we have tested "problem" units and utilizing our proper test equipment determined they were fine including measuring specification that were not even close to being out of tolerance.

If you look at the threads, you will see this particular issue has built up to be more prevalent and now we are staring to see a trend that will may help us determine the source and ultimate solution. Keep the info coming so we can continue to zero in on t he common denominator.
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Old 12-08-2010, 03:12 PM   #38
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I had a barely audible hum in my unit and it went away completely after I added a few inexpensive line filters from Radio Shack.
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Old 12-08-2010, 07:40 PM   #39
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I had a barely audible hum in my unit and it went away completely after I added a few inexpensive line filters from Radio Shack.
I have the same issue.

A little bit more detail on your fix please.

IE: chokes on the power lines, which lines, ground loop isolator on the signal lines, etc.....
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Old 12-09-2010, 01:03 PM   #40
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I have the same issue.

A little bit more detail on your fix please.

IE: chokes on the power lines, which lines, ground loop isolator on the signal lines, etc.....
Chokes on the audio cables (and also the video cables and coax though I wasn't seeing any real problems with the video).

Snap Choke Core - RadioShack.com

I pulled the unit from the cabinet for access to the cables. I also added a powered RF Booster to the radio antenna. That didn't seem to make much difference, but at the moment my TT is parked in a very remote area with bad reception. I think the booster may help once I get closer to civilization.
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