Stereo Receiver

Page 17 (FM Demodulator)

Revox B780 - FM Demodulator; Stereo Decoder

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Table of Contents

Contents3
Adjustment Instructions4
General5
Index to the Operating Controls5
Tuner Section5
Amplifier/Preamplifier Section6
Connector Panel7
Socket Layouts9
Disassembly11
Removing the Top Cover Plate11
Removing the Bottom Cover Plate11
Removing the Side Covers12
Removing the Heat Sink Incl. Power Stage PCB12
Removing the Rear Cover13
Removing the Terminal Board Cover13
Removing the Operating Panel13
Removing the Front Panel14
Replacing the Illumination Lamp of Signal Strength Meter14
Replacing the Signal Strength Meter14
Replacing the Power Switch15
Replacing the Power Line Fuse15
Replacing the Power Supply Fuse15
Description of Functions16
Balance-To-Unbalance Transformer16
RF Input Section16
FM Demodulator17
Stereo Decoder17
IF Amplifier18
Frequency Synthesizer and Local Oscillator19
Logic Section22
Microcomputer PCB22
Audio Section26
Meter Circuit and De-Emphasis26
Audio Connection Unit26
Preamplifier27
Tone Control PCB28
Power Amplifier28
Thermal Protection29
Speaker Protection29
Dolby Processor PCB30
Power Supply30
Required Measuring Instruments31
Checking the Supply Voltages33
Brief Test for Correct Functioning33
Preparatory Steps for Adjustments34
Calibrating the Synthesizer Quartz Reference34
Calibrating the Local Oscillator and Synthesizer35
Tuning the RF Circuits37
Adjusting the if Filter, if Amplifier and the Display Discriminator38
Adjusting the Stereo Decoder41
Adjusting the AF Level of the Tuner Signal42
Amplifier Adjustments43
Adjusting the Closed-Circuit Current for both Power Stages43
Function Diagram45
Power Supply Unit46
Station Selection Keyboard49
Push Button Board50
Input Selection Keyboard51
RF Front End PCB61
IF Amplifier PCB62
FM Demodulator PCB65
Technical Data101
Dimensions106

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