Alignment Procedureg - Sherwood RD-6106/G/RDS Service Manual

ALIGNMENT PROCEDURES
TUNER
1. Equipment Requried
« AM Standard Signal Generator (AM SSG) « Audio Generator
- Oscilloscope e Distortion Meter
«AC Voltmeter e DC Voltmeter
«FM Standard Signal Generator (FM SSG) « Frequency Counter
« Stereo Modulator
Note : Disconnect external FM antenna prior to alignment.
2. Non RDS Version Alignment
2-1. Alignment and Test Point
2-2. AM Alignment
+ Output of signal generator should not be greater than necessary to obtain an optimum output reading.
e Signal generator modulation : 30%
« Signal frequency : 400Hz
« Modulation frequency : 600, 1000, 1400kHz
« Switch : press the BAND Button to AM
Tunning voltage 520kHz 520kHz DC voltmeter RF BLOCK
fad ead ak
2 RF Tracking 600kHz 600kHz AC voltmeter RF BLOCK
oscilloscope ANT coil
tape monitor L/R
3 IF Tracking AC voltmeter
Adjust for
520kHZ : 1.1~1.3V
1710KHZ: 7.2V~8.5V
(DC 1.24 0.1V)
Maximize audio output
Repeat LOW, HIGH
frequency
IF BLOCK
Coil KSNT-104!
Maximize audio output
oscilloscope
tape monitor L/R
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