MLS MLSH041 Installation Manual

LBI-38438AMaintenance ManualService SectionMLS High-Band Two-WayMobile RadiosMLSH041

DISASSEMBLY PROCEDURE10 LBI-38438AFigure 4 – Disassembly Procedure (Front Panel)

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 115 ALIGNMENT AND TROUBLESHOOTING PROCEDURESRadio maintenance is facilitated by using the Troubles

ALIGNMENT AND TROUBLESHOOTING PROCEDURES12 LBI-38438A5.1.2 TX VCO & RX VCO AlignmentCMC-232A 29.7 - 42 MHzSTEPMETERINGPOINTTUNINGCONTROLMETER

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 13STEPMETERINGPOINTTUNINGCONTROLMETERREADING PROCEDURE1TP201ControlVoltageMonitorL206 7.0 VDC Selec

ALIGNMENT AND TROUBLESHOOTING PROCEDURES14 LBI-38438A3. Connect the audio oscillator and apply a 1 kHz tone at 850 mVrms to MIC HI, J701-4. Connect t

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 155.1.7 Audio Output Level Adjustment ProcedureSTEPMETERINGPOINTTUNINGCONTROLMETERREADING PROCEDUR

ALIGNMENT AND TROUBLESHOOTING PROCEDURES16 LBI-38438A5.2 TRANSMITTERAlignment and troubleshooting for Transmitter circuitry on the Transmitter/Receiv

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 175.2.3 Adjustment System5.2.4 Transmitter Adjustment ProcedureSTEP ITEMTESTPOINTTUNINGCONTROL PR

ALIGNMENT AND TROUBLESHOOTING PROCEDURES18 LBI-38438A5.2.5 Transmitter Troubleshooting

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 19

GENERAL INFORMATION2 LBI-38438ANOTICE!Repairs to this equipment should be made only by an authorized service technician or facility designated by the

ALIGNMENT AND TROUBLESHOOTING PROCEDURES20 LBI-38438A5.3 RECEIVERAlignment and Troubleshooting for Receiver Circuitry on Transmitter/Receiver BoardCMN

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 215.3.2 Alignment ProcedureSTEPTESTPOINTTUNINGCONTROLMETERREADING PROCEDURE1 TP501 9.0 ± 0.2VDCCon

ALIGNMENT AND TROUBLESHOOTING PROCEDURES22 LBI-38438A5. Check that the squelch opens at an input signal level corresponding to 8 dB SINAD(±1 dB).6.

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 232. Place the RANGE switch on the Distortion Analyzer in the 200 to 2000 Hz distortionrange posit

ALIGNMENT AND TROUBLESHOOTING PROCEDURES24 LBI-38438A5.3.5.4 Receiver Troubleshooting

ALIGNMENT AND TROUBLESHOOTING PROCEDURESLBI-38438A 25

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

TABLE OF CONTENTSLBI-38438A 31 DESCRIPTION...

DESCRIPTION4 LBI-38438A1 DESCRIPTIONThe service section contains the information necessary for aligning and troubleshootingthe MLS two-way FM mobile r

MAINTENANCELBI-38438A 53 MAINTENANCE3.1 PREVENTIVE MAINTENANCETo insure high operating efficiency and to prevent mechanical and electrical failures fr

MAINTENANCE6 LBI-38438AWARNINGThe PA transistor contains Beryllium Oxide, a TOXIC substance. If the ceramic orother encapsulation is opened, crushed,

MAINTENANCELBI-38438A 73.3 CHIP COMPONENT REPLACEMENTReplacement of chip capacitors should always be done with a temperature controlledsoldering iron

DISASSEMBLY PROCEDURE8 LBI-38438A4 DISASSEMBLY PROCEDURE4.1 TO REMOVE THE SYSTEM CONTROL/SYNTHESIZER BOARD1. Remove the two (2) screws (A) securing

DISASSEMBLY PROCEDURESLBI-38438A 9Figure 2 – Disassembly Procedure (Top View)Figure 3 – Disassembly Procedure (Bottom View)