Sherwood R-725/RDS Service Manual page 12

Maximize
audio output
IF 1000kHz 1000kHz Ac voltmeter and T3
(999kHz) (999kHz) oscilloscope to speaker [AM IFT
terminal of L or R channel
Tuned 1000kHz (999kHz) | 1000kHz "Tuned" flag in
Level 800 W/m (999kHz) the FL display
bel aca nl OE wl light on
3-3. FM Alignment
Switch : Press the BAND button to FM and the FM MODE button to MONO
signal oe Equipment Adjustment
Step | Subject
Generator
Frequency Canneetba
Point Adjust for
Frequenc Setting
HUBINS 98.1MHz
98.1MHz DC Volt meter
Zero reading on
THD 98.1MHz 98. 1MHz Distortion meter to Minimize
of L or R channel
Tuned 98.1MHz (98MHz) | 98.1MHz VR2 "Tuned" flag in
Level SSG output level :
=p
the FL display
10 W/m
light on
as 4. MPX Alignment
- Signal generator frequency : 98 MHz
* Signal generator deviation : USA: 75kHz. Europe : 40kHz
> RF signal frequency : 1 kHz
* Signal generator output level : 1000 .V/m
* Connect signal generator to FM antenna terminal through FM dummy antenna (75 &)
Seperation {8 % Modulation Pilot on
to 0 dB
Equipment
Connection
AC voltmeter to
speaker terminal
of R channel
AC voltmeter to AC voltmeter
speaker terminal
reading should be
of L channel
at least 40 dB below
Pilot on AC voltmeter to
VR3 Set AC voltmeter
speaker terminal to 0 dB
of L channel
AC voltmeter to AC voltmeter
speaker terminal
reading should be
of R channel at least 40 dB below
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