TECHNICAL MANUAL FOR COMPACT VHF DSC RM2042

3 SERVICE RM2042REPAIR IN 32.768 kHz OSCILLATOR (MODULE 2)Perform section 3.6.2, “ADJUSTMENT OF 32.768 kHz OSCILLATOR”.Check that the real time clock is performing correctly, by inspection of the display.3.9.3 REPAIR/REPLACEMENT OF RECEIVER MODULE (MODULE 3)REPLACEMENT OF RECEIVER MODULE (MODULE 3)If the receiver module is replaced with a new one, which is factory adjusted, it is only necessary to performsection 3.5, “CHECK OF SYSTEM PERFORMANCE”.REPAIR IN RECEIVER FRONT-END, FIRST MIXER AND 1st. IF. (MODULE 3)Perform section 3.6.3, “ADJUSTMENT OF FRONT-END FILTERS AND MIXER TRANFORMERS”.Perform section 3.5, “CHECK OF RECEIVER SENSITIVITY”.REPAIR IN LO1. (MODULE 3)Perform section 3.6.3, “ADJUSTMENT OF FIRST LOCAL OSCILLATOR”.Perform section 3.5, “CHECK OF RECEIVER SENSITIVITY”.REPAIR IN LO2 AND 2nd IF. (MODULE 3)Perform section 3.6.3, “ADJUSTMENT OF SECOND LOCAL OSCILLATOR”.Perform section 3.6.3, “ADJUSTMENT OF AF OUTPUT LEVEL”.Perform section 3.5, “CHECK OF RECEIVER SENSITIVITY”.REPAIR IN AF FILTERS (MODULE 3)Perform section 3.5, “CHECK OF RX AF FILTER RESPONSE”.Perform section 3.5, “CHECK OF DSC CALL SENSITIVITY”.REPAIR IN FSK ENCODER/DECODER (MODULE 3)Perform section 3.5, “CHECK OF TX AF LEVEL”.Perform section 3.5, “CHECK OF TX AF DISTORTION”.Perform section 3.5, “CHECK OF DSC CALL SENSITIVITY”.REPAIR IN CHANNEL-70 CARRIER DETECT (MODULE 3)Perform section 3.6.3, “ADJUSTMENT OF TRIGGER LEVEL FOR CHANNEL-70 CARRIER DETECT”REPAIR IN VHF CARRIER DETECT (MODULE 3)Perform section 3.6.3, “ADJUSTMENT OF TRIGGER LEVEL FOR VHF CARRIER DETECT”9403PAGE 3-11