User's Manual

ManualsBrandsADC Telecommunications ManualsElectronicsDigivanceÂ® LRCS 1900 MHz, 20-Watt LPA

ADCP-75-158 • Issue 1 • July 2003 • Section 5: Maintenance

Page 5-1

SECTION 5: MAINTENANCE

1 SYSTEM MAINTENANCE OVERVIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

1.1 Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

2 FAULT DETECTION AND ALARM REPORTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

3 FAULT ISOLATION AND TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

3.1 Host Unit Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

3.2 STM Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

3.3 LPA Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

4 TEST PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

4.1 Optical Power Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

4.2 Optical Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

5 MAINTENANCE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

5.1 Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

5.2 Remote Unit Outdoor Cabinet Filter Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

5.3 Host Unit Fan Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

5.4 Spectrum Transport Module Fan Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17

5.5 Linear Power Amplifier Fan Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-19

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1 SYSTEM MAINTENANCE OVERVIEW

This section explains the Digivance system fault detection and alarm reporting system, provides

a method for isolating and troubleshooting faults, and provides test and maintenance

procedures. The Digivance system requires minimal regular maintenance to insure continuous

and satisfactory operation. Components that require regular replacement, cleaning, or testing

include the HU and RU fans and the RU outdoor cabinet air-filter.

Maintenance also includes diagnosing and correcting service problems as they occur. When an

alarm is reported, it will be necessary to follow a systematic troubleshooting procedure to locate

the problem. Once the source of the problem is isolated, the appropriate corrective action can be

taken to restore service. The only internal components that can be replaced are the cooling fans

which mount in the HU, RU, and LPA. The failure of any other component within a unit will

require replacement of that unit.

1.1 Tools and Materials

The following tools and materials are required in order to complete the procedures in this

section:

•ESD wrist strap

• IR filtering safety glasses

• Patch cords with SC connectors

• 15 dB in-line SC optical attenuators