Fisher 434 Service Manual

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WORLD LEADER IN HIGH QUALITY STEREO

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TABLE OF CONTENTS

REQUIRED TEST EQUIPMENT .................. 2 SO LOGIC PARTS LIST ....................... 8
CHASSIS PARTS LIST .......................... 3 SO LOG|C SCHEMATIC ........................ 8
HARMONIC DISTORTION TEST ................. 3 CD-4 DEMODULATOR PARTS LIST ............ 8,9
TUNER ALIGNMENT PROCEDURES ............. 3 60-4 ALIGNMENT PROCEDURES ............ '. 9,10
TUNER SCHEMATIC ............................ 4 00-4 DEMODULATOR SCHEMATIC ............ 11
TUNER PARTS LIST ............................ 5 AUDIO CONTROL AMPLIFIER PARTS LIST ...... 12
TUNER BOARD LAYOUT ........................ 5 AUDIO CONTROL AMPLIFIER SCHEMATIC ..... 12
TUNER IC SIGNAL FLOW ....................... 6 POWER AMPLIFIER PARTS LIST ............... 12
TUNER IC CIRCUIT DESCRIPTION .............. 6 POWER AMPLIFIER SCHEMATIC ............... 13
SO DECODER PARTS LIST ...................... 7 POWER SUPPLY/DIAL LAMP SCHEMATIC ...... 14
SO DECODER SCH EMATIC ..................... 7 POWER SUPPLY/DIAL LAMP PARTS LIST ...... 15

REQUIRED TEST EQUIPMENT

The following test equipment is required to completely test and align the Tuner Section
and the CD4 Demodulator Section of the 434 Receiver.

0 Line Voltage Autotransformer or Voltage Regulator Model 3129 OR Frequency Counter

0 AC DC Multimeter 0 Four (4) Load Resistors, 8-0th, 250 Watts
0 Accurately Calibrated AC Voltmeter (Minimum Rating)

0 Oscilloscope (Flat to 100 kHz Minimum) 0 Low»Distortion AM-FM Signal Generator

9 Low-Distortion Audio Oscillator 0 10.7 MHz Sweep Generator

0 Harmonic Distortion Analyzer I 455 kHz Sweep Generator

0 CD-4 Generator (Fisher 3109 or equivalent) 0 Multiplex Generator

0 Frequency Indicator, Fisher 0 Two (2) RCA Shorting Plugs

CAUTION. This precision high-fidelity instrument should be serviced only by qualified personnel,
I trained in the repair of transitorized equipment and printed circuitry.

© COPYRIGHT 1974 FISHER RADIO t All Rights Reserved.