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ITEM # 602100022500
DOCUMENT TYPE:
Operation and Installation Manual
REV: 0
DOC #:
602100022500
PAGE 14 OF 17
TITLE:
Bi-Directional Amplifier System
Detail of 487XX Faceplate Dsub
Pins 1-8: Max sink/source = 15mA, output only. Accidental input max = 6.0 VDC
1. RX LNA Alarm, logic, low=fault
2. TX LNA Alarm, logic, low=fault
3. RX Converter fault, not used
4. TX Converter fault, not used
5. RX PA Alarm, logic, low=fault
6. TX PA Alarm, logic, low=fault
7. Temperature Alarm > +85 C, logic, low=fault
8. AGC Alarm, logic, low=fault
Pins 1-6 each refer to a specific module inside the 497XX. A low TTL voltage will light the associated
LED, indicating a fault condition with that component. See the Component Location section to find
the associated component’s part number. The faulty component may be removed and sent in for
repair, or a replacement may be ordered.
Pin 7 is a temperature alarm indication that the internal temperature has risen above +85°C. The
487XX series uses convection cooling, not fans. It is rated for +55°C ambient. In the event of the
temperature alarm, check to make sure the unit is mounted upright and vertical. There must be
sufficient room below and above the unit to allow airflow to the heat sink.