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Troubleshooting
115
If the on-screen
menus are visible on the television,
use the receiver's
diagnostics
menus to help determine
the problem.
To do this, use the front panel controls or IR
transmitter
of the receiver to place it in the customer test mode. Once in the test mode,
the receiver runs four tests. An explanation
of these tests is in the technical overview
section of this training manual.
If one of these test fail, use the following procedures to determine the cause of the
failure:
Signal
If the signal test fails the display will indicate "Check Dish and Connections."
When
this occurs make the following
checks:
CHECK
1
2
3
TEST
With a voltmeter,
check the DC voltage applied to the LNB. To do this, remove the coax
cable from the LNB and measure between the center conductor
and shield of the cable.
This voltage should be between
12 and 18 volts. If so, go to check 2. If not, suspect the
LNB cable or receiver.
Verify the dish is pointed at the DSS satellites.
To conf'Lrm this, use the signal strength
meter in the.DSS alignment
menu. This menu has two indicators
that are important
to
troubleshooting.
These are signal strength and lock. The signal strength meter indicates
the amount of signal received by the receiver.
The lock indicator indicates
whether the
received signal is the DSS signal.
If the receiver is locked to a DSS signal but signal
strength is low, chances are good that there is a dish pointing error or a defective
LNB. If
the receiver is receiving a strong signals but not locked, either the dish is pointed at the
wrong satellite or the receiver is defective.
If the menu shows both the signal strength
low
and the lock indicator and unlocked,
a defective receiver, LNB, or an error in dish pointing
could be the problem.
Substitute
the LNB. Once the LNB is substituted,
once again check the operation
of the
receiver.
Do this with the customer diagnostics
menu. If the diagnostics
menu signal
strength indicator checks OK, the original LNB was defective.
If the signal strength
indicator still does not check OK, suspect the receiver.
Figure 99, Troubleshooting
a No Signal Failure
Step 1 of this procedure
verifies the LNB is receiving power from the receiver.
If not,
the next cheek would be at the "SATELLITE
IN" jack at the rear of the receiver.
To
do this, unscrew the coax cable from this jack and measure between the center of the
jack and the shield. If this voltage measures between 12 and 18 volts, suspect a short
in the LNB cable.
If the LNB voltage is missing, suspect a defective receiver.
Step 1
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