Originally Posted by markrubin
OK all is good except:
some channels at some times do not appear: it says not authorized: they work OK on my RNG150 boxes
if I change channels and come back, the channel is sometimes back
any idea what this is? Comcast ran a diagnostic and says all OK
I recall if you can overload Cable card devices RF signal it can cause trouble? anyone tell me the best RF level? and which menu?
You have one of two problems. One is the signal strength is to hot which is common with the Roamio models and the second is the firmware for the SA CableCard is outdated.
There is two threads at TCF to cover this.
The first is the signal is to hot.
You may have to attenuate the signal strength going to the TiVo.
The second will require Comcast to push a firmware update to your CableCard.
The last couple of pages has some contact information if you need to get this done.
You can reduce the number of tuners in the Roamio to overcome this until your CableCard gets updates.
http://www.tivocommunity.com/tivo-vb/showthread.php?p=9785291#post9785291How to set the number of Tuners.
If the CableCARD in your Roamio does not support 6 tuners, here is how to reduce the number of tuners Roamio will use:
Go to Settings > Channels > Channel List
and enter one of the following number sequences using the number buttons on the remote. This will tell Roamio the how many tuners it can use.
- 88633 = use 3 tuners
- 88634 = use 4 tuners
- 88635 = use 5 tuners
- 88636 = use 6 tuners
You should hear some "Thumbs Up" dings confirming the number of tuners Roamio will use.