MLS MLSH041 Installationshandbuch Seite 1

LBI-38425AMaintenance ManualService SectionMLS II Highband Two-WayMobile RadiosMLSH041

LBI-38425A DISASSEMBLY PROCEDURE104.2 TO REMOVE THE TRANSMITTER/RECEIVER BOARD1. Remove the screws ! and % securing the top cover and the bottom cove

DISASSEMBLY PROCEDURE LBI-38425A11Figure 4 – Disassembly Procedure (Bottom View)Figure 5 – Disassembly Procedure (Front Panel)

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES125 ALIGNMENT AND TROUBLESHOOTINGPROCEDURESRadio maintenance is facilitated by using the Troublesh

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A135.1.2 TX VCO & RX VCO AlignmentSTEPMETERINGPOINTTUNINGCONTROLMETERREADING PROCEDURE1 TP201 C

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES145.1.3 Transmitter Frequency AdjustmentSTEPMETERINGPOINTTUNINGCONTROLMETERREADING PROCEDURENOTETh

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A155.1.4 Receiver Frequency Adjustment1. No receiver frequency adjustment is required.2. With prope

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES165.1.7 Audio Output Level Adjustment ProcedureSTEPMETERINGPOINTTUNINGCONTROLMETERREADING PROCEDUR

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A17NOOPERATIONDCVOLTAGEIC701- 38~ 5V?CHECKIC609IC701-4HIGH?5.1.8 Control Logic TroubleshootingRC-54

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES185.2 TRANSMITTERAlignment and troubleshooting procedures for Transmitter circuitry on theTransmitt

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A19ADJUSTMENT SYSTEMAVRPOWERSUPPLYRADIODIRECTIONALCOUPLERPOWERMETERSPECTRUMANALYZERATT SPECTRUMANALY

LBI-38425A GENERAL INFORMATION2NOTICE!Repairs to this equipment should be made only by an authorized service technician or facility designated by the

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES205.2.3 Transmitter Adjustment ProcedureSTEP ITEMTESTPOINTTUNINGCONTROL PROCEDURE1 Initial Setting

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A21TRANSMITTER TROUBLESHOOTING

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ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A235.3 RECEIVERAlignment and Troubleshooting procedures for Receiver Circuitry onTransmitter/Receive

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES245.3.2 Alignment ProcedureSTEPTESTPOINTTUNINGCONTROLMETERREADING PROCEDURE1 TP501 9.0 ± 0.2 VDC Co

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A255.3.3 Fixed Squelch Adjustment1. Disable Channel Guard, if present, (ground J701-7). Set Squelc

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES263. Adjust the VOLUME control for rated power output of 4 watts (4.0 Vrms across the4 ohm load) us

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A271. Set the Signal Generator output for twice the microvolt reading obtained in the 12 dBSINAD mea

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES28

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A29This Page Intentionally Left Blank

TABLE OF CONTENTS LBI-38425A3TABLE OF CONTENTSPage1 Description...

Com-Net Ericsson Critical Radio Systems, Inc.P.O. Box 2000Lynchburg, Virginia 24501Phone: 1-800-431-2345 or (Outside USA, 1-804-592-6100)www.com-neter

LBI-38425A DESCRIPTION AND INITIAL ADJUSTMENT41 DESCRIPTIONThe service section contains the information necessary for aligning and troubleshootingthe

MAINTENANCE LBI-38425A53 MAINTENANCE3.1 PREVENTIVE MAINTENANCETo insure high operating efficiency and to prevent mechanical and electrical failuresfro

LBI-38425A MAINTENANCE63.1.7 DisassemblyTo gain access to the transmitter, receiver, and the system control/synthesizer forservicing, loosen the four

MAINTENANCE LBI-38425A71. Remove the two retaining screws securing PA transistor TR1 to chassis assembly.2. Unsolder and remove capacitors. Use a des

LBI-38425A MAINTENANCE83.4 CHIP COMPONENT REPLACEMENTReplacement of chip capacitors should always be done with a temperature controlledsoldering iron

DISASSEMBLY PROCEDURE LBI-38425A94 DISASSEMBLY PROCEDURE4.1 TO REMOVE THE SYSTEM CONTROL/SYNTHESIZER BOARD1. Remove the two (2) screws ! securing the