RELEASED: 10/2/2006
Page 47
COMMUNICATI0NS
HSD SERIES OPERATION AND MAINTENANCE
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4. If the VSWR OVLD indicator has turned ON, the transmitter is in a standby
mode due to the operation of the protection circuits. Under this condition, the
cause of the VSWR problem at the transmitter's output must be cleared
before activating the VSWR OVLD RESET switch on the Control Board to
reactivate the transmitter.
5.
IF INPUT and LO LOCK indicators will turn OFF under one of five conditions:
Video is not applied to the modulator, the transmitter Operate/Standby switch
is in the Standby position, an overheat condition exists in the Final Amplifier
Assembly, the transmitter is in VSWR overload as discussed previously, or
one of the Up-Converter Drawer modules has failed. Correct these five
conditions as required to return the transmitter to operation.
5.5 HSD-2500 TROUBLESHOOTING CHART
The following chart is meant as an aid to uncovering faults that have developed in
the HSD transmitter. During normal operation, all indicators on the graphical
control interface should show their normal operation status as listed above. The
troubleshooting chart lists the indicators that are not in their normal state. When a
problem develops with the transmitter, note the corresponding display status states
and compare these to the chart.
HSD-2500 TROUBLESHOOTING CHART
PROBLEM
INDICATORS
CAUSE
SOLUTION
NO OUTPUT
POWER
LED INDICATES FAULT
+12V Power Supply
Failure
Check +12V Power
Supply module or
Power Supply Cable.
Replace cable if
defective.
Modulator Failure
Check modulator and
replace if faulty.
IF INPUT LED
EXTINGUISHED
Modulator is not con-
nected or is connected
with a faulty cable/s.
Check inputs.
Check cabling and
replace cable if
necessary.
12 VOLT SUPPY CIRCUIT
SHOWS NO OUTPUT AND
TRANSMITTER HAS NO
OUTPUT.
STANDBY/OPERATE
switch in STANDBY on
the front panel display
or remote control.
Place switch to ON.
