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17. TEST EQUIPMENT REQUIRED FOR SERVICING
AM Signal Generator
Test Loop
FM Signal Generator
Stereo Modulator
Frequency Counter
Audio Oscillator
Oscilloscope
VTVM
Circuit Tester
AC Wattmeter
AC Ammeter
Line Voltmeter
Variable Autotransformer
(0-140V AC, 10 amps)
Shorting Plug
Output Load (8 ohms,
±1% 100W)
Output Load (4 ohms,
±1% 100W)
18. AM ALIGNMENT PROCEDURES
18.1 AM IF ALIGNMENT
1. Connect a sweep generator to J153 and an alignment scope to the test point (B).
2. Turn each core of IF transformer L153 for maximum height and flat top
symmetrical response.
Table 1 lists the test equipment required for servicing the Model 2325 Stereophonic
Receiver.
Item
Manufacturer and Model No.
Less than 0.3% distortion
Less than 0.3% distortion
Weston Model CVO-100P, less
than 0.02% residual distortion
is required.
High sensitivity with DC hori-
zontal and vertical amplifiers.
With AC, DC, RF range
Simpson, Model 380
Commercial Grade (1-10A)
Commercial Grade
(0-150V AC)
Powerstat, Model 116B
Use phono plug with 600 ohm
across center pin and shell.
Commercial Grade
Commercial Grade
Table 1. Test Equipment Required for Servicing
Digitized in Heiloo Netherland
Use
Signal source for AM align-
ment.
Used with AM Signal generator.
Signal source for FM align-
ment.
Stereo separation alignment and
troubleshooting.
MPX Oscillator adjustment
(VCO).
Sinewave and squarewave signal
source.
Waveform analysis and trouble
shooting and ASO alignment.
Voltage measurements.
Trouble shooting.
Monitors primary power to Am-
plifier.
Monitors amplifier output un-
der short circuit condition.
Monitors potential of primary
power to amplifier.
Adjusts level of primary power
to amplifier.
Shorts amplifier input to elimi-
nate noise pickup.
Provides 8-ohm load for ampli-
fier output termination.
Provides 4-ohm load for ampli-
fier output termination.
5/30/2017
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