Fisher 332 Service Manual
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Page 1
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SERVICE MANUAL
_ The Fisher®
332
FM-AM
Stereo Receiver
?
WORLD LEADER IN HIGH QUALITY STEREO
Page 2
REQUIRED TEST EQUIPMENT
The following test equipment is required to completely test and align the Receiver:
- Line Voltage Autotransformer or Voltage
Regulator
AC DC Multimeter
Accurately Calibrated AC Voltmeter
Oscilloscope (Flat to 100 kHz Minimum)
Low-Distortion Audio SineWave Generator
Harmonic Distortion Analyzer
0 Two (2) Load Resistors, 8-ohms, 250 Watts
(Minimum Rating)
Low-Distortion AM-FM Signal Generator
10.7 MHZ Sweep Generator
Multiplex Generator
455 kHz Sweep Generator
CAUTION: Limit the following tests to no more
than ten minutes each. Use 8-ohm resistors with a
minimum power rating of 250 watts when connect-
ing a load across the SPEAKERS terminals.
HARMON IC DISTORTION TEST
CONTROL SETTINGS:
Unplug the AC power cord and set the front
panel controls as follows:
BASS, TREBLE, and BALANCE controls
to center positions
SPEAKERS switch to POWER OFF
FUNCTION switch to AUX
STEREO pushbutton depressed
LOUDNESS CONTOUR pushbutton out
(not depressed)
VOLUME control to MIN
LEFT CHANNEL DRIVEN
ONE CHANNEL DRIVEN:
(1) Connect a low distortion audio generator to
LEFT AUX IN jack. Set generator frequency to 1 kHz
and output to minimum.
(2) Connect an 8-ohm load resistor between
SPEAKERS MAIN LEFT and COM terminals.
Connect a Harmonic Distortion analyzer and an
AC VTVM in parallel across the 8-ohm load.
(3) Connect the AC power cord and set SPEAKERS
switch to MAIN. Turn VOLUME control to MAX.
(4) Increase generator output for 30 Watts RMS
(15.5V across the 8-ohm load). Harmonic Distortion
Analyzer should measure 0.5% distortion or less.
(5) Repeat steps I through 4 for RIGHT CHANNEL.
BOTH CHANNELS DRIVEN
Connect 8
(15.5 Volts across the 8-ohm loads). Harmonic Distortion Analyzer should measure 0.5% distortion or
less at each channel.
CAUTION _ This precision high-fidelity instrument should be serviced only by qualified
' personnel, trained in the repair of transistor equipment and printed circuitry.