Справочник Пользователя для Siemens RL-854

RL-854 Radio Control Unit
Type I, Style A

Maintenance



 2001 Siemens Airfield Solutions, Incorporated

96A0027L

Page 28

All rights reserved

Issued 5/01

CAUTION:  This equipment contains semiconductor devices
and integrated circuits.  Static electrical charge buildup in the
human body can destroy integrated circuits.  Wear a
commercially approved ground strap when handling printed

circuit boards containing integrated circuits.  Wearing a ground
strap discharges any static charge buildup to ground and ensures
the safety of the integrated circuit.  For information on using the
ground strap, refer to the ground strap instruction manual.

This section describes maintenance procedures for the RL-854 Radio
Control unit.

Prior to undertaking any maintenance to this unit, refer to Theory of
Operation in the Description section.

The only maintenance recommended by people other than skilled radio
technicians is changing the fuses, lamps, PCBs, and plug-in relays.  If a
problem develops in the unit, make the following checks:

1.  See Figure 2.  Make sure that power is coming into the unit by

measuring the AC voltage across input power line TB1 L to N.

 
2.  Make sure power switch is turned ON.  If it is on but the Power On

light is out, check fuse F1.

NOTE:  If the fuse is blown, replace only with the same size fuse.  If
the fuse blows again after replacement, consult a repairman to analyze
the problem.

3.  If the fuse is not blown, but the red power light does not come on,

check Power Light DS1.

 
4.  If during the operational test one of the relays (K1, K2, or K3) does not

operate, interchange it with one that does operate properly to determine
whether the relay or the electronic circuit that activates the relay is
defective.

 
5.  If the unit tests properly during an operational test, but cannot be

activated from an aircraft, inspect the antenna, antenna connectors, and
coaxial lead-in cable for shorts, breaks, or loose fittings.

6.  If the unit still cannot be activated from an aircraft, check to make sure

that the receiver PCB is set to the correct frequency.