Chapter 2 - Service and Troubleshooting
CTV-41 32
Digital Signal Status
If the customer is experiencing intermittent picture loss, freezing, or tiling,
the signal level of the cable or OTA signal can be checked in the service
mode or within the customer menu. The customer menu is easier to
access and is specific to those signal levels with pleasing graphics so it is
suggested to use this feature as opposed to the pages located within the
QM service graphics.
Figure 2-8 illustrates this feature. Signal readings can only be obtained for
digital sources at the antenna inputs. Analog signals will only display the
channel frequency and the fact that it is detected and locked.
The two important items to view are the AGC and Signal-To-Noise ratio
numbers. If the signal decreases, the numbers increase and vice versa.
Acceptable ranges for AGC are 18 to 54. SNR ranges are 16 to 22 for
ATSC and 29 to 38 for 256QAM.
New Remote Control Commands
The button sequnces to perform read, write and initialize commands
has changed. The table below shows the correct buttons to press for the
various tasks.
OPERATION COMMAND BUTTONS
SERVICE PAGE
DISPLAY
INITIALIZE DATA
"7"
"MUTE"
"0"
INI-
INI-EXE
INI-EXE
CUSTOMER
SETTINGS RESET
"8"
"MUTE"
"0"
RST-
RST-EXE
RST-EXE
READ NVM DATA
"9"
"0"
READ
READ
WRITE DATA
TO NVM
"MUTE"
"0"
WRITE
WRITE
To Next Page
Loading...
Need help?
General