Marantz SR2000 - FM Alignment Procedures; Tuning Meter Alignment; FM Tracking Alignment; FM IF Alignment

3.
FM ALIGNMENT PROCEDURES
(Selector switch in the FM position)
3.1. TUNING METER ALIGNMENT
1.
2.
Set the FM signal generator to no signal,
Adjust the secondary core of L201 ((@)} so that the tun-
ing meter may read zero (center position),
NOTE: Place the tuning pointer at 98 MHz adjacency.
3.2 FM TRACKING ALIGNMENT
1.
Connect an FM signal generator to the FM antenna ter-
minals and an oscilloscope and an audio distortion ana-
tyzer to the TAPE OUT jacks on the rear panel,
. Set the FM signal generator to 87.3 MHz and provide
about 3 to 5 wV. Place the tuning pointer at the low fre-
quency end by rotating the tuning knob and adjust the
core of oscillator coil L105 (()} to obtain maximum
audio output. ;
. Set the FM signal generator to 109 MHz and provide
about 3 to 5 uV. Rotate the tuning knob and place the
tuning pointer at the high frequency end and adjust the
trimming capacitor C114 ((D)) for maximum output,
NOTE: Keep the C114 at a half of satisfied capacitance.
4.
5.
Repeat steps 2 and 3 untii no further adjustment is nec-
essary.
Set the FM signal generator to 90 MHz and tune the re-
ceiver to the same frequency. Decrease signal generator
output untif the audio output jevel decreases with the
decreasing generatar output. Adjust the antenna coil
L101 (8), RF coil L103 (©) for minimum audio dis-
tartion.
6.
Set the FM signal generator to 106 MHz and tune the
receiver to the same frequency. Adjust the trimming
capacitors TC; (B)) and TC, (©) for minimum distor-
tion,
. Repeat steps 5 and 6 until no further adjustment is nec-
essary.
3.3 FM IF ALIGNMENT
1.
Set the FM signal generator to 98 MHz and increase its
usable output level and tune the receiver to the same fre-
quency. ‘
. The L106 (©) should be adjusted for maximum output
waveform with decreasing the FM signal generator input
level so that the amount of noise should be the same on
and beneath the waveform. Readjust the L201 for cor-
rect zero point as turning the L106 deviates zero point.
'3.4 MONO DISTORTION ALIGNMENT
i:
2.
3.
4.
Set the FM signa! generator to provide 60 dB at 98 MHz.
Set the modulation of FM signal generator to 1 kHz,
100%.
Place the tuning meter pointer at the center position.
Adjust the primary core (upper) of L201 ((F)) for mini-
mum distortion,
25 STEREO DISTORTION ALIGNMENT
1.
2.
3.
Set the FM signal generator to provide stereo composite
signal and tune the receiver to the same frequency,
Adjust the L106 (©) for minimum distortion.
Repeat the adjustment of L201 so that the tuning meter
may read zero. ,
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Figure 1. Adjustment Point Locatians