User's Manual

9-6 68P81093C75-A
Interpreting LED
Indicators
Several LED indicators are provided on the front panels and on the
top panel of the chassis. These LEDs give a quick status indication
of the station equipment. The Station Control Module LEDs are
visible from the station’s top panel. Observing the other LEDs
requires the removal of the station’s chassis from the case. See
Figure 3 for the location of all LED indicators on the station’s
equipment. A listing of each LED indicator, along with a description
of the status indicated by each LED, is shown in Table 11.
Table 11. PDR 3500 LED Indicator Functions
LED Location LED Name Status Definition
EXCITER MODULE
Tx Lock – GREEN when Exciter synthesizer is locked; module fully functional.
– OFF when:
synthesizer is out of lock
or
+5V, +14.2V, or both are absent
PA Full – GREEN when transmitter is keyed and PA output power is at expected power level
(as set by technician via RSS during station alignment)
– OFF when:
PA not keyed
or
PA keyed, but PA output power is not at expected power level
(as set by technician via RSS during station alignment)
PA Low – YELLOW when transmitter is keyed and PA output power is less than expected
power level (as set by technician via RSS during station alignment) but not shut
down (for example, during power cutback mode)
– OFF when:
PA not keyed
or
PA keyed, and PA output power is at expected power level
(as set by technician via RSS during station alignment)
PA Fail – RED when:
No PA output power (for example, during PA shutdown mode);
LED status is latched, thereby indicating status during current key or
for previous key
NOTE : Any component associated with the PA could cause LED to light.
These include the Exciter, PA, and transmitter circuitry on the backplane,
as well as the Intermediate PA in an 800 MHz station.
– FLASHING when PA is in the Test Mode (activated by technician via RSS;
when in Test Mode, power cutback, and open power loop protection are
disabled)
– OFF when PA output power is either at expected level, or at specific cutback
levels (any level other than shutdown); LED status is latched, thereby indicating
status during current key, or for previous key.
TOP PANEL Pwr/Tx – GREEN when AC or DC input power is present
– RED when station is transmitting
– OFF when AC or DC input power is absent