MODELS: LT-37131 / LT-37132 / LT-46131 / LT-46231
Page 13
Cable providers send QAM64 and/or QAM256 through the
coax cable to the TV’s tuner. Once converted to IF it is demodulated
to an MPEG transport stream (TS). If a card is present in the
PCMCIA slot the TS will be passed to the card and returned back to
IC8506 and then finally sent to the Xilleon processor. If there is no
card present in the card slot and the tuner is tuned to a QAM channel
the TS will pass directly from the POD interface IC directly to the
Xilleon for processing.
Cable providers typically have both encrypted and
unencrypted channels. If the Xilleon receives an encrypted
TS it will ask the CableCARD to unscramble the stream. The
card will only unscramble the TS if it receives the proper
authorizations to do so. Those authorizations are received
via Out-of-Band data (OOB). The OOB contains information
about authorizations, channel maps and more.
SYMPTOM
POSSIBLE CAUSE(S)
POSSIBLE RESOLUTIONS
1
No channel map appears when pressing
guide button (TVGuide disabled)
Cable is not connected to ANT1 -or-
OOB data is not received correctly
1) Verify cable is connected to ANT1
2) Re-install/Replace CableCARD
3) Verify signal level and signal noise level
4) Contact Service Provider
5) Check TU101 for proper function/Replace Signal PWB
2
Channel map does not change after card is
installed. (still showing basic cable map)
CableCARD is not 'Initialized' within the service
providers system.
Contact service provider
3
Host ID screen does not appear
Signal and information not received by TV
1) Verify cable is connected to ANT1
2) Re-install CableCARD
3) Replace CableCARD
4) Verify signal level and signal noise level
4
Error code received on screen. Error codes
are listed such as 161-x
Communication between TV and card is lost or
disrupted
1) Pull card from TV and wait 5 minutes. Then reinstall the
card and verify it is initializing properly.
2) Press INPUT & FORMAT keys on the front panel.
3) Replace CableCARD with new card
4) Try 3rd CableCARD
5) Replace DM-PWB
5
Individual channel cannot be received.
(example HBOHD is no video and no audio
but other HBO channels are OK)
The TV has no means to block individual
channels. Proper authorization is not received.
Contact service provider
6
Certain tier of channels is not received.
(example: Premium channels or all HD
channels not received)
Authorizations to display scrambled channels are
sent via OOB data.
Contact service provider
7
Unable to tune to a channel. (example:
Pressing 1055 has no response and stays on
current channel)
1055 is not available in the channel map.
Channel map is sent via OOB from the service
provider.
Verify OOB is locked. If OOB is locked, verify channel
should be received. If not locked, troubleshoot for OOB
failure on SIGNAL PWB and/or with service provider.
8
When using SA card channels changing
automatically and random message about
upgrade in process. (Channels are often like
10,000 to 50,000)
CableCARD firmware is out of date and being
upgraded by service provider.
If this process continues more than 60 minutes, contact the
service provider for updated card
9
Periodically encrypted channels become
unavailable.
Card is hung
Unplug card or AC or perform initialize
10
Only Analog channels can be viewed. All
digital/encrypted channels are unavailable
Proper authorization is not received or TV cannot
display digital video
1st test for QAM clear channel (often network channels are
provided free), if no QAM clear channel is available remove
the card and memorize channels. Verify that a digital
channel can be viewed. If known digital channel cannot be
viewed suspect SIGNAL
11
ChannelView does not list program content or
channel call letters
This information is provided in the form of OOB
data tables and is sent at the discretion of the
service provider
Contact service provider
OOB Tuner (TU-101 )
Main Tuner (TU-100)
(Cable/ATSC/NTSC)
PCMCIA
SLOT
(CableCARD)
Air
in
Cable
Ma
tr
ix
S
W
DEMODULATOR
IC1500
POD I/F
IC8506
XILLEON
IC8001
SIGNAL-PWB
DM-PWB
Data Bus
TS &
Data
TS &
Data
TS &
Data
Data
Bus
To Engine
CableCARD
Summary of Contents for LT-37131
Page 2: ......
Page 4: ...MODELS LT 37131 LT 37132 LT 46131 LT 46231 Page 4 ...
Page 37: ...Page 37 MODELS LT 37131 LT 37132 LT 46131 LT 46231 POWER SUPPLY ...
Page 38: ...Page 38 MODELS LT 37131 LT 37132 LT 46131 LT 46231 DM SIGNAL POWER SUPPLIES ...
Page 39: ...Page 39 MODELS LT 37131 LT 37132 LT 46131 LT 46231 VIDEO SIGNAL PATH ...
Page 40: ...Page 40 MODELS LT 37131 LT 37132 LT 46131 LT 46231 AUDIO SIGNAL PATH ...
