Glenayre GL-T8541 User Manual

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GL-T8541 PA

Specifications subject to change without notice

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GL-T8541 Power Amplifier

USER MANUAL

PN 9110.01002

REV A

09/10/99

Table of Contents

Troubleshooting

Summary of Contents for Glenayre GL-T8541

Page 1 All rights reserved. No part of this work may be reproduced or copied in any form or by any means -- graphic, electronic, or mechanical, including photocopying, recording, taping, or information-retrieval system -- without written permission of Glenayre. Copyright © 1997 Glenayre...
Page 3: Table Of Contents
Applicable Documents ..... 1-1 About Glenayre ..... . . 1-2 1.3.1...
Page 4 GL-T8541 PA Glenayre Document Number: 9110.01002 Table of Contents 09/10/99 5.3.2 Turn Fan On and Off ......5-1 5.3.3...
Page 5 Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 Table of Contents 7.6.3 Calibrating The RF Output of the PA....7-4 7.6.4 Testing the Antenna and its RF Feedline ....7-5 7.6.5...
Page 6 GL-T8541 PA Glenayre Document Number: 9110.01002 Table of Contents 09/10/99 Combiner Board ..... . . 8-5 8.7.1 Removal ......8-5 8.7.2...
Page 7 List of Figures Figure 3-1 GL-T8541 PA with DSP Exciter ..... 3-3 Figure 3-2 GL-T8541 PA Module Front and Top View (no cover) ..3-4 Figure 3-3 PA Module Circuit Board Connecting Copper Jumper Straps .
Page 8 GL-T8541 PA Glenayre Document Number: 9110.01002 List of Figures 09/10/99 Figure 7-12 120 Watt PA Board Showing RF Transistor Gate and Drain Pads..7-22 Figure 8-1 Fan Panel Assembly (exploded) ..... 8-7 Figure 8-2 Top Cover Details .
Page 9 Metering Board (J1) to Combiner Board (J8) Connector Pinout ..3-5 Table 6-1 GL-T8541 PA Optional Isolator RF Power Output... . 6-2 Table 6-2 Metering Board to Combiner Board Interface ....6-10 Table 6-3 Power Amplifier Metering Board Fuses .
Page 11: General
GENERAL GENERAL 1.1 Manual Scope This manual presents Glenayre’s 250-watt, 450-MHz power amplifier, and contains infor- mation concerning installation, operation, and maintenance of the RF PA compartment. 1.2 Applicable Documents In addition to this manual, other manuals may be required for complete paging-site docu- mentation.
Page 12: About Glenayre
RA number must be shown on labels attached to the item(s). The cost of shipping to Glenayre is to be paid by the customer. Shipping from Glenayre will be prepaid by the customer, and shipped via surface mail. If express shipping is required, the unit will be shipped collect.
Page 13: Specifications
Specifications listed here are limited to the characteristics of the power amplifier, not the transmitter system. 2.2 GL-T8541 PA Specifications Refer to Table 2-1, PA Specifications, for power amplifier specifications. Note: the specifications are subject to change without notice.
Page 14 GL-T8541 PA Glenayre Document Number: 9110.01002 SPECIFICATIONS 09/10/99 Table 2-1 PA Specifications Characteristic (unit of measurement) Condition Specification Harmonic output -90 dBc (or -36dBm if less) RF power stability Over rated temperature ±0.5 dB Intermodulation of PA With single isolator...
Page 15: Description
• modular construction • status output to exciter 3.2 Physical Description Refer to Figure 3-2 for board locations in the GL-T8541 PA. Refer to Table 3-1 for pc as- semblies and part numbers. 3.2.1 Electrical Connectors The PA module has two type-N connectors for RF input and output and one DB-15 type for control and monitoring signals.
Page 16: Pa Front
GL-T8541 PA Glenayre Document Number: 9110.01002 DESCRIPTION 09/10/99 Table 3-1 Power Amplifier Assemblies Assembly Part Number PA assembly 2100.00135 Driver board 2000.00050 1 to 3 RF splitter 2000.00145 PA board 2000.00027 3 to 1 RF combiner 2000.00106 Metering board 2000.00601 3.2.3 PA Front...
Page 17: Figure 3-1 Gl-T8541 Pa With Dsp Exciter
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 DESCRIPTION v0862.hgl Figure 3-1 GL-T8541 PA with DSP Exciter Copyright © 1997 Glenayre Page: 3-3...
Page 18: Figure 3-2 Gl-T8541 Pa Module Front And Top View (No Cover)
Low Pass Filter and Directional Coupler (Part of Combiner Board) UHF 3 to 1 Combiner Board PA-1 PA-2 PA-3 UHF 3 to 1 Splitter Power Amplifier Figure 3-2 GL-T8541 PA Module Front and Top View (no cover) Page: 3-4 Copyright © 1997 Glenayre...
Page 19: Pa Module Interconnection
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 DESCRIPTION 3.4 PA Module Interconnection 3.4.1 PA Module Dc, Signal, and Control Wiring All PA module dc voltages, monitoring signals, and control signals are routed through the metering and combiner boards to or from the various PA module circuit boards. The combiner board to metering board connection is achieved through a D-sub 25 connector.
Page 20: Isolator
GL-T8541 PA Glenayre Document Number: 9110.01002 DESCRIPTION 09/10/99 Metering Board +dc Input Metering Board to PA Interface Connection to Exciter Interface RF IN Ground Fuses Fuses Fuse RF OUT Connection Low Pass Filter and Directional Coupler UHF 3 to 1 Combiner Board...
Page 21: Installation
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 INSTALLATION INSTALLATION 4.1 Installation Installation of the transmitter and related equipment should be done by properly qualified personnel, to ensure that the overall installation meets requirements of the local codes. This section provides information common to all installations. Transmitter setup is mostly done through the user interface software, which is covered in a separate manual.
Page 22: Inspection
The power amplifier requires a 28 volt dc supply to operate as specified. Total supply current varies depending on transmitter model, other racked equipment, and RF output. One GL-T8541 PA (with exciter) requires approximately 644 watts of dc power when operating at rated RF output. See section two for more information.
Page 25: Operation
OPERATION 5.1 General The GL-T8541 PA normally operates via commands from a remote transmitter controller. Local operation is possible using a video display terminal connected through the DSP ex- citer; this is described in the separate VDT user manual. Refer to section one of this manual for information about the VDT manual.
Page 26: Figure 5-1 Gl-T8541 Front View With Dsp Exciter
GL-T8541 PA Glenayre Document Number: 9110.01002 OPERATION 09/10/99 v1024.hgl Figure 5-1 GL-T8541 Front View with DSP Exciter Page: 5-2 Copyright © 1997 Glenayre...
Page 27: Theory Of Operation
These boards are not designed to be repaired; instead, they are replaced. Refer to Figure 6-1, for a visual representation of RF flow through the GL-T8541 PA. Each of the blocks of the block diagram represents a circuit board in the power amplifier module.
Page 28: Adding The Optional Isolator
This increases the isolator and reject load dissipation and oper- ating temperature. High antenna system VSWR means less power will be radiated from the antenna, resulting in lower effective radiated power (ERP). Table 6-1 GL-T8541 PA Optional Isolator RF Power Output Output Power Isolator Type Insertion Loss...
Page 29: Q1 Bias And Idle Current Adjustment
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION 6.2.1 Q1 Bias and Idle Current Adjustment The bias for Q1 is determined by a resistive voltage divider which consists of dropping resistor R5 and potentiometer R6. Drain current for Q1 flows as long as dc power is supplied to the power amplifier.
Page 30: The 1 To 3 Splitter Board
Refer to Figure 6-3 for a simplified block diagram of the 120 watt power amplifier board. Refer to Figure 6-16 and Figure 6-17 for detailed circuit board assembly and schematic diagrams. The GL-T8541 transmitter uses three PA boards to achieve rated transmitter output.
Page 31: Pa Bias And Idle Current Adjustment
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION AGC Voltage +28 Vdc From Metering From Metering Board Board R8, R9 5.1V Ferrite Beads RF Input RF Output From 1 to 3 to 3 to 1 Splitter Combiner L8, Coax...
Page 32: To 1 Combiner Board
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 6.5 3 to 1 Combiner Board Refer to Figure 6-4, for a block diagram of the 3 to 1 combiner board. Refer to Figure 6-18 and Figure 6-19 for detailed circuit board assembly and schematic diagrams. This board...
Page 33: Figure 6-4 The 3 To 1 Combiner Board Block Diagram
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION RF Output to Isolator or Lightning Arrester RF Input 3 to 1 UHF Combiner From PA Board Low Pass Filter Directional Coupler 50Ω RF Input 3-Way From PA Wilkinson Hybrid...
Page 34: Pa Module Overall Rf Flow
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 6.6 PA Module Overall RF Flow The overall RF flow, through all of the boards in the PA module, is shown in Figure 6-5. The discrete capacitors and inductors that connect the various traces of the RF path are not shown, but the main path is still apparent.
Page 35: Metering Board
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION 6.7 Metering Board The metering board is mounted on the outside of the rear panel of the PA module. Refer to Figure 6-6 for the block diagram of the metering board.
Page 36: Metering Board To Combiner Board To Amplifier Board Interface6-10
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 6.7.2 Metering Board to Combiner Board to Amplifier Board Interface The metering board to combiner board interface is accomplished through the PA connec- tors J1, a D-sub 25 connector on the metering board, and J8, a D-sub 25 connector on the combiner board.
Page 37: Fan Power
The dc voltage used to operate the fans may be fused in three separate locations, depending upon the type of power supply used. The three possibilities are listed below: If the Glenayre 2835 switching power supply or direct 28 volt service is used, the fan power is fused in the dc breaker/fuse panel.
Page 38: Metering Board Regulators And Test Points
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 6.7.5 Metering Board Regulators and Test Points The metering board has voltage regulators which supply power to circuits on the metering board. Refer to Table 6-4 for the metering board test points, voltages, and regulators; and to Figure 6-7 for metering board component locations.
Page 39: The Analog Signal Multiplexers
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION 6.7.6 The Analog Signal Multiplexers The metering board has two multiplexer chips (U15 and U16). These chips receive the various PA signals that are to be monitored by the DSP exciter and displayed on its VDT screen.
Page 40: Figure 6-6 Metering Board Block Diagram
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 v0866.hgl Figure 6-6 Metering Board Block Diagram Page: 6-14 Copyright © 1997 Glenayre...
Page 41: Figure 6-7 Metering Board Fuses, Test Points, And Jumpers (2000.00601)
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION v1020.hgl Figure 6-7 Metering Board Fuses, Test Points, and Jumpers (2000.00601) Copyright © 1997 Glenayre Page: 6-15...
Page 42: Pa Current Monitoring Circuit
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 6.7.7 PA Current Monitoring Circuit The +28 volt supply to the driver and each power amplifier module passes through a current monitoring circuit in the metering board. A fused +28 volt supply bus feeds the input side of each current monitoring circuit and each amplifier board.
Page 43: Agc Circuit
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION 6.7.8 AGC Circuit Refer to Figure 6-9 for a simplified circuit diagram of the metering board AGC circuit. The heart of the AGC circuit is comparator U9-A. The output of comparator U9-A is a variable error voltage (the AGC signal) that sets the RF output power of each PA board.
Page 44: Figure 6-10 Metering Board Schematic, Page 1 Or 2 (2000.00601)
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 v1018.hgl Figure 6-10 Metering Board Schematic, page 1 or 2 (2000.00601) Page: 6-18 Copyright © 1997 Glenayre...
Page 45: Figure 6-11 Metering Board Schematic, Page 2 Of 2 (2000.00601)
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION v1019.hgl Figure 6-11 Metering Board Schematic, page 2 of 2 (2000.00601) Copyright © 1997 Glenayre Page: 6-19...
Page 46: Figure 6-12 Driver Board Assembly, Top View (2000.00050)
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 v0832.hgl Figure 6-12 Driver Board Assembly, Top View (2000.00050) Page: 6-20 Copyright © 1997 Glenayre...
Page 47: Figure 6-13 Driver Board Schematic (2000.00050)
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION v0833.hgl Figure 6-13 Driver Board Schematic (2000.00050) Copyright © 1997 Glenayre Page: 6-21...
Page 48: Figure 6-14 3 To 1 Splitter Assembly, Top View (2000.00145)
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 v0841.hgl Figure 6-14 3 to 1 Splitter Assembly, Top View (2000.00145) Page: 6-22 Copyright © 1997 Glenayre...
Page 49: Figure 6-15 3 To 1 Splitter Schematic (2000.00145)
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION v0842.hgl Figure 6-15 3 to 1 Splitter Schematic (2000.00145) Copyright © 1997 Glenayre Page: 6-23...
Page 50: Figure 6-16 120 Watt Pa Board Assembly, Top View (2000.00027)
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 v0838.hgl Figure 6-16 120 Watt PA Board Assembly, Top View (2000.00027) Page: 6-24 Copyright © 1997 Glenayre...
Page 51: Figure 6-17 120 Watt Pa Board Schematic (2000.00027)
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION v0839.hgl Figure 6-17 120 Watt PA Board Schematic (2000.00027) Copyright © 1997 Glenayre Page: 6-25...
Page 52: Figure 6-18 3 To 1 Combiner Assembly, Top View (2000.00106)
GL-T8541 PA Glenayre Document Number: 9110.01002 THEORY OF OPERATION 09/10/99 v0846.hgl Figure 6-18 3 to 1 Combiner Assembly, Top View (2000.00106) Page: 6-26 Copyright © 1997 Glenayre...
Page 53: Figure 6-19 3 To 1 Combiner Schematic (2000.00106)
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 THEORY OF OPERATION v0847.hgl Figure 6-19 3 to 1 Combiner Schematic (2000.00106) Copyright © 1997 Glenayre Page: 6-27...
Page 55: Checkout And Maintenance
VDT manual. Note Components on the pc boards require special tools and techniques for replacement. Glenayre recommends that any defective pc board be returned to the factory for exchange. Caution When you fasten any dc connectors, be certain that the plug is centered directly on its corresponding jack and that the polarity is correct.
Page 56: Cleaning
GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 7.3 Cleaning Remove all power from the transmitter before the cleaning operation is started. Power can be turned on again after the cleaning operation is complete. Check the air path for dirt and obstructions. Use a vacuum cleaner, a brush, and a damp cloth (if necessary) to remove dust from the PA air path.
Page 57: Pa Fan And Air Flow Check
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE 7.6.1 PA Fan and Air Flow Check Check that the fan is operating when power is applied. If the fan is not operating: Check the fan fuse, which is located on the front panel of the ferroresonant power supply, or on the dc breaker panel, or on the dc to dc converter.
Page 58: Calibrating The Rf Output Of The Pa
GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 v1021.hgl Figure 7-1 Chassis Back View 7.6.3 Calibrating The RF Output of the PA The setup shown Figure 7-2can be used to calibrate the RF output power level of the PA.
Page 59: Testing The Antenna And Its Rf Feedline
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE 7.6.4 Testing the Antenna and its RF Feedline The RF wattmeter and RF test load can be connected between the output of the isolator and the antenna to determine the performance of the RF feedline and antenna. Refer to Figure 7-3 for the test setup.
Page 60: Checking Isolator Loss
--------- - Where: Loss = isolator loss in dB = power amplifier output power = isolator output power Table 7-2 GL-T8541 PA Optional Isolator RF Power Output Output Power Isolator Type Insertion Loss (with 250 watts input) Single section 0.35 dB...
Page 61: Checking Isolation Of Isolator
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE 7.6.5.1 Checking Isolation of Isolator Refer to Figure 7-5. This setup can be used to check the isolation of the isolator. The isolator is connected backwards in this setup, so that all the power entering from the PA is routed to the isolator output port and into the isolator reject load.
Page 62: Setting Pa Module Bias And Idle Current
7.7 Setting PA Module Bias and Idle Current To insure correct performance of the GL-T8541 Transmitter, the bias must be set correctly for each transistor on the driver and PA boards. The bias must be set after a transistor on a board has been replaced, or an amplifier board has been replaced.
Page 63: Setting Pa Board Rf Transistor Bias
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE D. The Q1 idle current should read 20 +/-5 mA. Refer to left side of Figure 7-6. E. Remove all power from the transmitter. Remove the meter from the test points Replace jumper JW1.
Page 64 GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 Adjust driver board Q1 bias using the following sub-routine: A. Remove JW1 from the driver board. B. Connect a current meter between test points TP1 and TP2. C. Apply power to the transmitter, but do not key it.
Page 65: Figure 7-6 Driver Board (Left) And Pa Board (Right) Layouts
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE Figure 7-6 Driver Board (left) and PA BOARD (right) Layouts Copyright © 1997 Glenayre Page: 7-11...
Page 66: Resume Paging Operation
GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 7.8 Resume Paging Operation Maintenance procedures often require local control of the transmitter, obtained through the exciter VDT. This causes normal paging operation to cease, and allows the operator to control the transmitter and perform specific tests.
Page 67: Table 7-3 Pa Module Faults
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE TABLE XX is a chart of symptoms and causes that should aid in the power amplifier troubleshooting. Table 7-3 PA Module Faults Symptom Problem Area Item to Replace No RF output, driver current at (or slightly below)
Page 68 GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 Table 7-3 PA Module Faults Symptom Problem Area Item to Replace Low or zero RF output, driver board or one PA Open Replace metering board board with zero current amplifier-board-current-sensing...
Page 69: Advanced Troubleshooting
Some additional tips will be useful in the event of a failure of one or more of the RF power transistors in the GL-T8541 PA module. The most common failure mode for these FET transistors is a low resistance path between the gate and source.
Page 70: Driver Board Troubleshooting
Remove power and reconfigure the transmitter normally. 7.11.2 Driver Board Troubleshooting Troubleshooting the driver board can be difficult for the GL-T8541 PA because the idle currents for driver transistors Q1 and Q2 are extremely low. Driver troubleshooting requires four steps, which are: •...
Page 71: Checking Driver Board Q1
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE 7.11.2.2 Checking Driver Board Q1 Remove power from transmitter. Remove metering board fuses F3, F6, and F8 (to remove +28 V from PAs 1, 2, and 3 respectively). Refer to Figure 7-1.
Page 72: Figure 7-9 Driver Board Q1 Test Setup
GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 Remove RF Jumper Ground Pad Coaxial Cable RF Transistor +28 Volt Drain Supply Test Point To RF Wattmeter and Test Load Remove L6 To Test Q1 RF Output Level Figure 7-9 Driver Board Q1 Test Setup Page: 7-18 Copyright ©...
Page 73: Driver Board Output Test
11. The output of driver board should be 40 watts maximum with 1.5 watts into Q2, depending on the R16 bias setting for Q2. For the GL-T8541 PA, Q2 is biased for approximately 20 watts output. 12. Unkey transmitter, remove power from transmitter, replace metering board fuses removed in step 2, and reassemble the driver board and PA module.
Page 74: Figure 7-11 Driver Board Rf Output Test Setup
GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 Remove RF Jumper to Splitter Board To RF Wattmeter and Test Load Ground Pad Coaxial Cable Figure 7-11 Driver Board RF Output Test Setup Page: 7-20 Copyright © 1997 Glenayre...
Page 75: Pa Board Troubleshooting
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 CHECKOUT AND MAINTENANCE 7.11.3 PA Board Troubleshooting When an RF transistor in any stage of the PA fails, its drain current will often be very low or zero, depending on how many cells in the transistor fail. Since the gate to ground (source) resistance decreases substantially, the keyed bias voltage to the gate of the tran- sistor will be loaded down.
Page 76 GL-T8541 PA Glenayre Document Number: 9110.01002 CHECKOUT AND MAINTENANCE 09/10/99 v0838.hgl RF transistor gate pad. Measure resistance between gate and ground. RF Transistor Drain Pad Figure 7-12 120 Watt PA Board Showing RF Transistor Gate and Drain Pads Page: 7-22...
Page 77: Removal And Reinstallation
PCB cover Note Components on the pc boards require special tools and techniques for replacement. Glenayre recommends that any defective pc board be returned to the factory for exchange. 8.1 Fan Removal Refer to Figure 8-1, for information on how to remove individual fans from the fan panel.
Page 78: Top Cover Removal
GL-T8541 PA Glenayre Document Number: 9110.01002 REMOVAL AND REINSTALLATION 09/10/99 8.3 Top Cover Removal Remove all power from the transmitter. Loosen the four screws on the front panel of the PA module and slide the PA module out of the transmitter chassis.
Page 79: Splitter Board
Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 REMOVAL AND REINSTALLATION 8.5 Splitter Board 8.5.1 Removal Heed all cautions at the beginning of this section. Refer to Figure 8-4, for details. Remove the PA cover and the inner PA PCB cover.
Page 80: Pa Board
GL-T8541 PA Glenayre Document Number: 9110.01002 REMOVAL AND REINSTALLATION 09/10/99 8.6 PA Board 8.6.1 Removal Heed all cautions at the beginning of this section. Refer to Figure 8-5, for details. Remove the PA cover and the inner PA PCB cover.
Page 81 Glenayre Document Number: 9110.01002 GL-T8541 PA 09/10/99 REMOVAL AND REINSTALLATION 8.7 Combiner Board 8.7.1 Removal Heed all cautions at the beginning of this section. Refer to Figure 8-6, for details. Remove the PA cover and the inner PA PCB cover.
Page 82 GL-T8541 PA Glenayre Document Number: 9110.01002 REMOVAL AND REINSTALLATION 09/10/99 8.8 Metering Board 8.8.1 Removal Heed all cautions at the beginning of this section. Refer to Figure 8-7 for details. Remove all power from transmitter. Make certain no dc power is applied to the meter- ing board.

Glenayre GL-T8541 User Manual

1 General

2 Specifications

3 Description

4 Installation

5 Operation

6 Theory of Operation

7 Checkout and Maintenance

8 Removal and Reinstallation

Quick Links

Troubleshooting

Related Manuals for Glenayre GL-T8541

Summary of Contents for Glenayre GL-T8541

Table of Contents