Alignment Procedures - Sherwood R-772 Service Manual

TUNER
1. Equipment Requried
• AM Standard Signal Generator (AM SSG)
• Oscilloscope
• AC Voltmeter
• FM Standard Signal Generator (FM SSG)
• 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.
• Signal generator modulation : 30%
• Signal frequency : 400Hz
• Modulation frequency : 600, 1000, 1400kHz
• Switch : press the BAND Button to AM
Signal generator
Step
Subject
1
Tuning voltage
2
RF Tracking
3
IF Tracking
4 Seek level

ALIGNMENT PROCEDURES

FM STEREO SEPARATION Adj.
SVR01
FM AUTO STOP LEVEL Adj.
Set frequency
setting setting
520kHz 520kHz
600kHz 600kHz
600kHz 600kHz
600kHz 600kHz
• Audio Generator
• Distortion Meter
• DC Voltmeter
• Frequency Counter
SVR02
Equipment
Adjustment point
connection
DC voltmeter RF BLOCK
OSC coil
AC voltmeter RF BLOCK
oscilloscope ANT coil
tape monitor L/R
AC voltmeter IF BLOCK
oscilloscope Coil KSNT-104I
tape monitor L/R
AC voltmeter SVR 03
oscilloscope
tape monitor L/R
18
Adjust for
520kHZ : 1.1~1.3V
1710kHZ: 7.2V~8.5V
(DC 1.2± 0.1V)
Maximize audio output
Repeat LOW, HIGH
frequency
Maximize audio output
Tuned on point