Marantz 2215 - AM IF Alignment Procedure; AM Frequency Range and Tracking Alignment; AM Alignment Procedures; FM Alignment Procedures

9. AM Alignment Procedure
AM IF Alignment
1.
2.
Connect
a
sweep
generator
to
the
J102
and
an
alignment
scope
to
the
capacitor
C125,
Rotate
each
core
of
IF
transformer
F101
and
L102
for
the
maximum
height
and
flat
top
symmetrical
response.
AM Frequency Range and Tracking Alignment
1.
2.
6.
Set
AM
signal
generator
to
525
KHz.
Turn
the
tuning
capacitor
fully
closed
(place
the
tuning
pointer
at
the
low
end.)
and
adjust
the
oscillator
coil
L101
for
maximum
audio
output.
Set
the
signal
generator
to
1650
KHz.
Place
the
tuning
pointer
in
the
high
frequency
end
and
adjust the trimming capacitor C155-2 for maximum audio output.
.
Repeat
step
1
and
2
until
no
further
adjustment
is
necessary.
.
Set
the
generator
to
600
KHz
and
tune
the
receiver.to
the
same
frequency
and
adjust
a
slug
core of AM ferrite rod antenna for maximum output.
.Set the generator to 1400 KHz and tune the receiver to the same frequency and adjust the
trimming capacitor C155-1 for maximum output.
Repeat the procedure 4 and 5 until no further adjustment is necessary.
Note: During tracking alignment reduce the signal generator output as necessary to avoid AGC
action.
10. FM Alignment Procedure
1.
2.
Connect a FM signal generator to the FM antenna terminals and a oscilloscope and an audio
distortion analyzer to the tape output jack on the rear panel.
Set the FM SG to 87.5 MHz and provide about 3 to 5uV. Place the tuning pointer at the low
frequency end by rotating the tuning knob and adjust the core of oscillator coil L106 to
obtain maximum audio output.
. Set the FM SG to 108.5 MHz and provide about 3 to 5uV. Rotate the tuning knob and place
the’ tuning pointer at the high frequency end and adjust the trimming capacitor C152 for
maximum output.
. Repeat the step 2 and 3 until no further adjustment is necessary.
.Set the FM SG to 90 MHz and tune the receiver to the same frequency. Decrease signal
generator output until the audio output level decreases with the decreasing generator output.
Adjust the RF coil L104 and antenna coil L103 and IF transformer L105 for minimum audio.
distortion.
. Set the FM SG to 106 MHz and tune the receiver to the same frequency. Decrease the signal
generator output until the audio output level decreases with the decreasing generator output.
Adjust the trimming capacitor C155-3 and C155-4 for minimum distortion.
. Repeat the step 5 and 6 until no further adjustment is necessary.
. Connect a DC VTVM with 1 V range selected across the capacitor C277 and adjust the
secondary core (black) of discriminator transformer L201 so that no voltage reading is
obtained on the VTVM at no signal. Next set the FM SG to 98 MHz and increase the output
level 1 KuV, then tune the receiver to the same frequency so that no deflection is obtained on
the VTVM. Adjust primary core (pink) of L201 for minimum distortion.