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10. TEST
EQUIPMENT
REQUIRED
FOR
SERVICING
Table 1 lists the test equipment required for servicing the Model 2240 Receiver.
AM Signal Generator
Manufacturer and Model No.
Signal source for AM alignment.
Test Loop
Used with AM signal generator.
FM Signal Generator
Less than 0.3% distorsion
Signal source for FM alignment.
Stereo Modulator
Frequency Counter
Audio Oscillator
Oscilloscope
Less than 0.3% distorsion
Stereo separation alignment and trouble
shooting.
MPX Oscillator adjustment (VCO).
Weston Model CVO-100P, less
than 0.02% residual distortion
is required.
Sinewave and squarewave signal source.
High sensitivity with DC
horizontal and vertical
amplifiers.
Waveform analysis and trouble shooting and
ASO alignment.
VTVM
With AC, DC, RF range
Voltage measurements.
Circuit Tester
4
Trouble shooting.
AC Wattmeter
Simpson, Model 390
Monitors primary power to Amplifier.
AC Ammeter
Commercial Grade (1-10A)
Monitors amplifier output under short circuit
condition.
Line Voltmeter
Variable Autotransformer
(0-140V AC, 10 amps)
Shorting Plug
Powerstat, Model
116B
amplifier.
Adjusts level of primary power to amplifier.
across center pin and shell.
Output Load (8 ohms,
+1% 100W)
Commercial Grade
Output Load (4 ohms,
£1% 100W)
Commercial Grade
Provides 8-ohm load for amplifier output
termination.
Provides 4-ohm load for amplifier output
termination.
11. AM
ALIGNMENT
PROCEDURE
11.1 AM IF Alignment
11.2 AM Freqeuncy Range and Tracking Alignment
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