Siemens RL-854 manual Maintenance Introduction

Page 33

RL-854 Radio Control Unit

 

Type I, Style A

Maintenance

5. Maintenance

Introduction

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.

 2001 Siemens Airfield Solutions, Incorporated

96A0027L

Page 28

All rights reserved

Issued 5/01

 

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Contents RL-854 Radio Control Type I, Style a Rev Description EC No Checked Approved Date Record of ChangesTable of Contents List of Figures Warranties Disclaimers RL-854 Radio Control Unit Type I, Style a Safety Safety SymbolsIntended Use Safety Symbols contd Qualified PersonnelOperation InstallationAction in the Event of a System or Component Malfunction Maintenance and RepairIntroduction DescriptionRadio Controller Power Handling Capability Introduction contd OptionsHeater Main Assembly Equipment Specification DataCabinet ReceiverEquipment Specification Data Number Part Description Quantity Description Part NumberRadio Control Restrictions Interfacing Radio ControllerIntensity Control Intensity Control contd Periods Microphone ClicksClicks General Theory of OperationMain Assembly contd Interface Panel Interface Panel contd Automatic Radio Control Other L-821 Configurations Installation Unpacking Installing Standard RL-854Contd Tighten jam nuts against the hub to secure the radials Assembling AntennaAssembling Antenna Safety Precautions Installing AntennaMounting Antenna Installing RL-854PR Radio ControllerOperation Incremental Relay Option Installing RL-854PR Radio Controller contdDecoder PCB Startup Procedures Controls and IndicatorsIndicators ControlsStartup Procedures contd Startup Procedures contd Maintenance Introduction Switch Receiver Frequency SettingProblems and Possible Causes Solutions TroubleshootingParts Using the Illustrated Parts List Troubleshooting contdRL-854 Radio Control Unit Part Numbering System Description Part NumberRL-854 Main Assembly Parts List TypeHeater RL-854 Motherboard Assembly Parts List RL-854 Main Assembly PartsRL-854 Motherboard Assembly Parts List contd DS1 RL-854 Control Board and Fuse Assembly Parts ListItem No Description Part Number Optional PartsRF Frequency Switch Settings for Frequency Control of Receiver PCBA-2 A-3 A-4 A-5 A-6 A-7 A-8 A-9 A-10 A-11 A-12 A-13 A-14 A-15 A-16
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