Marantz ST400 - Test Equipment Required Servicing; Alignment Procedures; FM Alignment Procedures (Selector Switch in the FM Position)

3. TEST EQUIPMENT REQUIRED FOR SERVICING
This table lists the test equipment required for servicing the Model ST400 Tuner.
Manufacturer and Model No.
Use
Signal source for AM Alignment
Use with AM Signal Generator
Signal source for FM alignment
Stereo separation alignment and trouble
shooting
AM Signal Generator
Test Loop
FM Signal Generator
MPX Signal Generator Sound Technology Mode! 1000A
Distortion measurements
Sinewave and squarewave signal source
Voltage measurements (AC)
Distortion Analyzer
Audio Oscillator
AC VTVM
Sound Technology Model 1700A
Tektronix Model T932
Philips Model 3232
Oscilloscope Waveform analysis and trouble shooting
MPX Oscillator adjustment (VCO)
Frequency display alignment
Trouble shooting
Voltage measurements (DC)
Frequency Counter
Circuit Tester
Fluke Model 8000 “‘Digital’’ Simpson
Model 313, Triplet Model 801
AC Wattmeter Simpson Model 1379 Monitors primary power to tuner
Simpson Model 1359 Monitors potential of primary power to tuner
‘ Superior Electronic Co., : :
Variable Autotransformer Powerstat Model 116B-10A Adjusts level of primary power to tuner
4. ALIGNMENT PROCEDURES
DC VTVM
A dummy resistor of 47 k-ohms must be connected across the tuner output terminals before alignment.
4.1 FM Alignment Procedures (Selector switch in the “FM” position)
1. FM IF Alignment
Signal Source Signal Indicator Set Dial
Connection Frequency Connection Pointer to:
L104 for maximum
and symmetric
response.
Oscilloscope to
10.7 MHz point ©)
marker at Quiet point on
10.6, 10.7 and band.
10.8 MHz Oscilloscope to
point ©
Sweep generator to
point through
5pF capacitor
L201 for straight and
Symmetric 'S" curve
response.
Repeat steps 1 and 2.