Sherwood RV-4050R Service Manual page 10

4. FM IF Alignment
Preparation
2. Switch : Press to FM.
3. Signal generator deviation : 75 kHz.
4. Be sure to disconnect FM line cord antenna during alignment.
Signat
Generator
Frequency
98.1 MHz
(1 kHz, Mod.)
98.1 MHz
(1 kHz, Mod.)
Receiver
Frequency on
the Dispiay
Equipment
Connection
Distortion L403
meter to (FM IFT)
TAPE OUT jack
Minimum
distortion
Zero reading
on AC voltmeter
5. MPX Alignment
FM Antenna
Terminal (3000)
FM Dummy
with SSG output
level of 6 pV
Tape out
AM *
Signal
Generator
Front-End
FE401
AM
Signal
Generator
Direct Coupling
AM Alignment Connection
as 1250 (112.59) =
O
Zin =500 (750) ® 3 Z out=3002 (Balanced)
O
1502
FM Dummy Antenna to 3002 Antenna terminal of receiver
FM Dummy Antenna
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FM RAIF and MPX Alignment Connection
Preparation
1. Switch : Press to FM.
2. Tune for 98 MHz on band.
3. Signal Generator output level: 1000 pV.
4. Deviation : 75 kHz, at 100% modulation of composite signal.
Setting
VR401
(SEP ADJ)
AC voltmeter reading
should be at least
33 dB below.
AC voltmeter to
TAPE OUT jack
of R channel
Composite to
channel
1 kHz "L" CH.
8% Mod.
VR401
(SEP ADJ)
of L channel
Composite to
channel
1 kHz ""R® CH.
8% Mod.
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