Marantz SR620 - Page 6

4.2 Multiplex Alignment Procedures (Selector switch in the ““FM’’ position/Mode switch in the STEREO position)
Signal Source
Connection
Indicator
Connection
Signal
Frequency
Set the Digital
Readout Frequency
Adjust:
£
RF generator to FM antenna
terminals through matching
signal
network. with 1mV FM stereo
Frequency counter
98.0 MHz to (J119)
R312 so that frequency
may precisely read
76 kHz.
RF generator to FM antenna
terminals through matching
with 1mV FM stereo signal
Modulation level.
DIN 40kHz +8% pilot
SHF 67.5 kHz +9% pilot
network (300 ohms, balanced)
VTVMto Rorl
channel output
(5102)
98.0 MHz
tFT (A101) for minimum
distortion.
RF generator to FM antenna
terminals through matching
with 1mV FM stereo signal.
network (300 ohms, balanced)
VTVM to right
and left channel
output (J110)
Pilot only
R309 so that minimum
output should be the
same in both channels.
RF generator to FM antenna
terminals through matching
with 1mvV FM stereo signa!
Modulation level.
DIN 40kHz +8% pilot
IHF 67.5 kHz +9% pilot
network (300 ohms, balanced)
VTVM to right
channel output
(J110)
Stereo left
(1,000 Hz}
VTVM to left
channel! output
(J110)
Stereo right
(1,000 Hz)
4.3 AM Alignment Procedures
Repeat steps 4 and 5.
1. AM (MW) Local Oscillator Alignment
Signal Source
Connection
2. AM (MW) RF Alignment
Signal Source
Connection
Indicator
Connection
Signal
Frequency
Set the Digital
R338 for same separation
in both channels.
Adjust:
DC voltmeter in
3V range to
(5102)
Indicator
Connection
Signal
Frequency
Set the Digital
LAO1 for 1.5V.
Readout Frequency
Apply the signal to the
AM loop antenna from the
RF generator using the
test loop.
As per the Figure 1.
1,404 kHz 1,404 kHz
VTVMto Lor R
CAO5-1 for maximum
output.
————— channel output
603 kHz (J102) 603 kHz
3. AM IF Alignment
Signal Source
Connection
pn Erereerin, US 2 Se ee
LAO3 for maximum
output.
Repeat steps 1 and 2 as necessary to obtain maximum sensitivity.
Indicator
Connection
Signal
Frequency
Set the Digital
Readout Frequency
Adjust:
Sweep generator to
(J101 AM Ant)
Quiet point on
band
| 450 kHz Oscilloscope to ,
i (J111)
LAOS for maximum and
symmetric response.