Ericsson LBI-38505A Specifications Page 1

LBI-38505A(Supercedes LBI-30025) TABLE OF CONTENTSRF ASSEMBLY, MIXER AND REFILTER BOARD . . . . . . . . . . . . . LBI-30032

TROUBLESHOOTING PROCEDURESSQUELCHED UNSQUELCHEDNOISE SQ OUTPUT U605-20.2 VDC 9.9VCAS U605-10.1 VDC 9.9VRX MUTE U605-140.2 VDC 9.9VRUS U605-130.2 VDC 4

TROUBLESHOOTING PROCEDURES406-512 MHz MASTR II RECEIVERLBI-38505 LBI-3850510

406-512 MHz MASTR II RECEIVERTROUBLESHOOTING PROCEDURESLBI-38505 LBI-3850511

Copyright © May 1990, Ericsson GE Mobile Communications Inc.TABLE OF CONTENTSPageSPECIFICATIONS . . . . . . . . . . . . . .

DESCRIPTIONMASTR II Base Station, 406 to 512 megahertz receiversare single conversion, superheterodyne FM receivers designedfor one-through eight-freq

To remove the IF Filter board from the radio:1. Remove the eight screws (E) holding the IF Filter bottomcover.2. Remove the six screws (F) holding the

FRONT END ALIGNMENTEQUIPMENT REQUIRED1.Test Set Models 4EX3A11, 4EX8K12, or 20,000 ohms-per-Volt multimeter with a 1 Volt scale.2.A 406-512 MHz signa

406-512 MHz MASTR II RECEIVERICOM FREQUENCY ADJUSTMENTFirst, check the frequency to determine if any adjustment is required. The frequency measurement

ALIGNMENT PROCEDURESCOMPLETE RECEIVER ALIGNMENTEQUIPMENT REQUIRED1.Test Set Models 4EX3A11, 4EX8K12, or 20,000 ohms-per Volt multimeter with a 1- Volt

TEST PROCEDURESThese Test Procedures are designed to help you to service areceiver that is operating---but not properly. The problems en-countered cou

TROUBLESHOOTING PROCEDURESTEST PROCEDURESTEST PROCEDURESSTEP 2USABLE SENSITIVITY(12 dB SINAD)If STEP 1 checks out properly, measure the receiver sensi