Fisher 234 Service Manual

Page 1

i

«a

WORLD LEADER IN HIGH QUALITY STEREO

Page 2

TABLE OF CONTENTS

REQUIRED TEST EQUIPMENT ......... 2 PREAMPLIFIER/SO PARTS LIST ......... 7
CHASSIS PARTS LIST ................ 3 PREAMPLIFIER/SO SCHEMATIC ......... 7
HARMONIC DISTORTION TEST ........ 3 AUDIO CONTROL AMPLIFIER PARTS LIST. . 8
TUNER ALIGNMENT PROCEDURES .... 3 AUDIO CONTROL AMPLIFIER SCHEMATIC.. 8
TUNER SCHEMATIC .................. 4 POWER AMPLIFIER PARTS LIST ........... 9
TUNER PARTS LIST .................. 5 POWER AMPLIFIER SCHEMATIC .......... 9
TUNER BOARD LAYOUT ............. 5 POWER SUPPLY/DIAL LAMP SCHEMATIC ... 10
TUNER IC SIGNAL FLOW ............ 6 POWER SUPPLY/DIAL LAMP PARTS LIST t.. IO
TUNER IC DESCRIPTION .............. 6
REQUIRED TEST EQUIPMENT
The following test equipment is required to completely test and align
the 234 Receiver.
0 Line Voltage Autotransformer or Voltage Regulator o Four (4) Load Resistors, 8-ohms, 50 Watts
0 AC DC Multimeter (Minimum Rating)
0 Accurately Calibrated AC Voltmeter o Low-Distortion AM-FM Signal Generator
0 Oscilloscope (Flat to 100 kHz Minimum) 0 10.7 MHz Sweep Generator, Fisher Model 3024
' o Low-Distortion Audio Oscillator or equivalent
o Harmonic Distortion Analyzer 0 455 KHz Sweep Generator, Fisher Model 3025
§ 9 (ID-4 Generator (Fisher 3109 or equivalent) or equivalent
0 Frequency Indicator or Frequency Counter 0 Multiplex Generator, Fisher Model 1536 or equivalent

0 Two (2) RCA Shorting Plugs

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

© COPYFHGHT 1974 FISHER RADIO I All Righls Reserved.

3
I
l
E